/* Copyright (c) 2015, Google Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */

/* This code is mostly taken from the ref10 version of Ed25519 in SUPERCOP
 * 20141124 (http://bench.cr.yp.to/supercop.html). That code is released as
 * public domain but this file has the ISC license just to keep licencing
 * simple.
 *
 * The field functions are shared by Ed25519 and X25519 where possible. */

#include <openssl/curve25519.h>

#include <string.h>

#include <openssl/cpu.h>
#include <openssl/mem.h>
#include <openssl/rand.h>
#include <openssl/sha.h>


/* fe means field element. Here the field is \Z/(2^255-19). An element t,
 * entries t[0]...t[9], represents the integer t[0]+2^26 t[1]+2^51 t[2]+2^77
 * t[3]+2^102 t[4]+...+2^230 t[9]. Bounds on each t[i] vary depending on
 * context.  */
typedef int32_t fe[10];

static uint64_t load_3(const uint8_t *in) {
  uint64_t result;
  result = (uint64_t)in[0];
  result |= ((uint64_t)in[1]) << 8;
  result |= ((uint64_t)in[2]) << 16;
  return result;
}

static uint64_t load_4(const uint8_t *in) {
  uint64_t result;
  result = (uint64_t)in[0];
  result |= ((uint64_t)in[1]) << 8;
  result |= ((uint64_t)in[2]) << 16;
  result |= ((uint64_t)in[3]) << 24;
  return result;
}

static void fe_frombytes(fe h, const uint8_t *s) {
  /* Ignores top bit of h. */
  int64_t h0 = load_4(s);
  int64_t h1 = load_3(s + 4) << 6;
  int64_t h2 = load_3(s + 7) << 5;
  int64_t h3 = load_3(s + 10) << 3;
  int64_t h4 = load_3(s + 13) << 2;
  int64_t h5 = load_4(s + 16);
  int64_t h6 = load_3(s + 20) << 7;
  int64_t h7 = load_3(s + 23) << 5;
  int64_t h8 = load_3(s + 26) << 4;
  int64_t h9 = (load_3(s + 29) & 8388607) << 2;
  int64_t carry0;
  int64_t carry1;
  int64_t carry2;
  int64_t carry3;
  int64_t carry4;
  int64_t carry5;
  int64_t carry6;
  int64_t carry7;
  int64_t carry8;
  int64_t carry9;

  carry9 = (h9 + (int64_t) (1<<24)) >> 25; h0 += carry9 * 19; h9 -= carry9 << 25;
  carry1 = (h1 + (int64_t) (1<<24)) >> 25; h2 += carry1; h1 -= carry1 << 25;
  carry3 = (h3 + (int64_t) (1<<24)) >> 25; h4 += carry3; h3 -= carry3 << 25;
  carry5 = (h5 + (int64_t) (1<<24)) >> 25; h6 += carry5; h5 -= carry5 << 25;
  carry7 = (h7 + (int64_t) (1<<24)) >> 25; h8 += carry7; h7 -= carry7 << 25;

  carry0 = (h0 + (int64_t) (1<<25)) >> 26; h1 += carry0; h0 -= carry0 << 26;
  carry2 = (h2 + (int64_t) (1<<25)) >> 26; h3 += carry2; h2 -= carry2 << 26;
  carry4 = (h4 + (int64_t) (1<<25)) >> 26; h5 += carry4; h4 -= carry4 << 26;
  carry6 = (h6 + (int64_t) (1<<25)) >> 26; h7 += carry6; h6 -= carry6 << 26;
  carry8 = (h8 + (int64_t) (1<<25)) >> 26; h9 += carry8; h8 -= carry8 << 26;

  h[0] = h0;
  h[1] = h1;
  h[2] = h2;
  h[3] = h3;
  h[4] = h4;
  h[5] = h5;
  h[6] = h6;
  h[7] = h7;
  h[8] = h8;
  h[9] = h9;
}

/* Preconditions:
 *  |h| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
 *
 * Write p=2^255-19; q=floor(h/p).
 * Basic claim: q = floor(2^(-255)(h + 19 2^(-25)h9 + 2^(-1))).
 *
 * Proof:
 *   Have |h|<=p so |q|<=1 so |19^2 2^(-255) q|<1/4.
 *   Also have |h-2^230 h9|<2^231 so |19 2^(-255)(h-2^230 h9)|<1/4.
 *
 *   Write y=2^(-1)-19^2 2^(-255)q-19 2^(-255)(h-2^230 h9).
 *   Then 0<y<1.
 *
 *   Write r=h-pq.
 *   Have 0<=r<=p-1=2^255-20.
 *   Thus 0<=r+19(2^-255)r<r+19(2^-255)2^255<=2^255-1.
 *
 *   Write x=r+19(2^-255)r+y.
 *   Then 0<x<2^255 so floor(2^(-255)x) = 0 so floor(q+2^(-255)x) = q.
 *
 *   Have q+2^(-255)x = 2^(-255)(h + 19 2^(-25) h9 + 2^(-1))
 *   so floor(2^(-255)(h + 19 2^(-25) h9 + 2^(-1))) = q. */
static void fe_tobytes(uint8_t *s, const fe h) {
  int32_t h0 = h[0];
  int32_t h1 = h[1];
  int32_t h2 = h[2];
  int32_t h3 = h[3];
  int32_t h4 = h[4];
  int32_t h5 = h[5];
  int32_t h6 = h[6];
  int32_t h7 = h[7];
  int32_t h8 = h[8];
  int32_t h9 = h[9];
  int32_t q;
  int32_t carry0;
  int32_t carry1;
  int32_t carry2;
  int32_t carry3;
  int32_t carry4;
  int32_t carry5;
  int32_t carry6;
  int32_t carry7;
  int32_t carry8;
  int32_t carry9;

  q = (19 * h9 + (((int32_t) 1) << 24)) >> 25;
  q = (h0 + q) >> 26;
  q = (h1 + q) >> 25;
  q = (h2 + q) >> 26;
  q = (h3 + q) >> 25;
  q = (h4 + q) >> 26;
  q = (h5 + q) >> 25;
  q = (h6 + q) >> 26;
  q = (h7 + q) >> 25;
  q = (h8 + q) >> 26;
  q = (h9 + q) >> 25;

  /* Goal: Output h-(2^255-19)q, which is between 0 and 2^255-20. */
  h0 += 19 * q;
  /* Goal: Output h-2^255 q, which is between 0 and 2^255-20. */

  carry0 = h0 >> 26; h1 += carry0; h0 -= carry0 << 26;
  carry1 = h1 >> 25; h2 += carry1; h1 -= carry1 << 25;
  carry2 = h2 >> 26; h3 += carry2; h2 -= carry2 << 26;
  carry3 = h3 >> 25; h4 += carry3; h3 -= carry3 << 25;
  carry4 = h4 >> 26; h5 += carry4; h4 -= carry4 << 26;
  carry5 = h5 >> 25; h6 += carry5; h5 -= carry5 << 25;
  carry6 = h6 >> 26; h7 += carry6; h6 -= carry6 << 26;
  carry7 = h7 >> 25; h8 += carry7; h7 -= carry7 << 25;
  carry8 = h8 >> 26; h9 += carry8; h8 -= carry8 << 26;
  carry9 = h9 >> 25;               h9 -= carry9 << 25;
                  /* h10 = carry9 */

  /* Goal: Output h0+...+2^255 h10-2^255 q, which is between 0 and 2^255-20.
   * Have h0+...+2^230 h9 between 0 and 2^255-1;
   * evidently 2^255 h10-2^255 q = 0.
   * Goal: Output h0+...+2^230 h9.  */

  s[0] = h0 >> 0;
  s[1] = h0 >> 8;
  s[2] = h0 >> 16;
  s[3] = (h0 >> 24) | (h1 << 2);
  s[4] = h1 >> 6;
  s[5] = h1 >> 14;
  s[6] = (h1 >> 22) | (h2 << 3);
  s[7] = h2 >> 5;
  s[8] = h2 >> 13;
  s[9] = (h2 >> 21) | (h3 << 5);
  s[10] = h3 >> 3;
  s[11] = h3 >> 11;
  s[12] = (h3 >> 19) | (h4 << 6);
  s[13] = h4 >> 2;
  s[14] = h4 >> 10;
  s[15] = h4 >> 18;
  s[16] = h5 >> 0;
  s[17] = h5 >> 8;
  s[18] = h5 >> 16;
  s[19] = (h5 >> 24) | (h6 << 1);
  s[20] = h6 >> 7;
  s[21] = h6 >> 15;
  s[22] = (h6 >> 23) | (h7 << 3);
  s[23] = h7 >> 5;
  s[24] = h7 >> 13;
  s[25] = (h7 >> 21) | (h8 << 4);
  s[26] = h8 >> 4;
  s[27] = h8 >> 12;
  s[28] = (h8 >> 20) | (h9 << 6);
  s[29] = h9 >> 2;
  s[30] = h9 >> 10;
  s[31] = h9 >> 18;
}

/* h = f */
static void fe_copy(fe h, const fe f) {
  memmove(h, f, sizeof(int32_t) * 10);
}

/* h = 0 */
static void fe_0(fe h) { memset(h, 0, sizeof(int32_t) * 10); }

/* h = 1 */
static void fe_1(fe h) {
  memset(h, 0, sizeof(int32_t) * 10);
  h[0] = 1;
}

/* Replace (f,g) with (g,f) if b == 1;
 * replace (f,g) with (f,g) if b == 0.
 *
 * Preconditions: b in {0,1}. */
static void fe_cswap(fe f, fe g, unsigned int b) {
  b = 0-b;
  unsigned i;
  for (i = 0; i < 10; i++) {
    int32_t x = f[i] ^ g[i];
    x &= b;
    f[i] ^= x;
    g[i] ^= x;
  }
}

/* h = f + g
 * Can overlap h with f or g.
 *
 * Preconditions:
 *    |f| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
 *    |g| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
 *
 * Postconditions:
 *    |h| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc. */
static void fe_add(fe h, const fe f, const fe g) {
  unsigned i;
  for (i = 0; i < 10; i++) {
    h[i] = f[i] + g[i];
  }
}

/* h = f - g
 * Can overlap h with f or g.
 *
 * Preconditions:
 *    |f| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
 *    |g| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
 *
 * Postconditions:
 *    |h| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc. */
static void fe_sub(fe h, const fe f, const fe g) {
  unsigned i;
  for (i = 0; i < 10; i++) {
    h[i] = f[i] - g[i];
  }
}

/* h = f * g
 * Can overlap h with f or g.
 *
 * Preconditions:
 *    |f| bounded by 1.65*2^26,1.65*2^25,1.65*2^26,1.65*2^25,etc.
 *    |g| bounded by 1.65*2^26,1.65*2^25,1.65*2^26,1.65*2^25,etc.
 *
 * Postconditions:
 *    |h| bounded by 1.01*2^25,1.01*2^24,1.01*2^25,1.01*2^24,etc.
 *
 * Notes on implementation strategy:
 *
 * Using schoolbook multiplication.
 * Karatsuba would save a little in some cost models.
 *
 * Most multiplications by 2 and 19 are 32-bit precomputations;
 * cheaper than 64-bit postcomputations.
 *
 * There is one remaining multiplication by 19 in the carry chain;
 * one *19 precomputation can be merged into this,
 * but the resulting data flow is considerably less clean.
 *
 * There are 12 carries below.
 * 10 of them are 2-way parallelizable and vectorizable.
 * Can get away with 11 carries, but then data flow is much deeper.
 *
 * With tighter constraints on inputs can squeeze carries into int32. */
static void fe_mul(fe h, const fe f, const fe g) {
  int32_t f0 = f[0];
  int32_t f1 = f[1];
  int32_t f2 = f[2];
  int32_t f3 = f[3];
  int32_t f4 = f[4];
  int32_t f5 = f[5];
  int32_t f6 = f[6];
  int32_t f7 = f[7];
  int32_t f8 = f[8];
  int32_t f9 = f[9];
  int32_t g0 = g[0];
  int32_t g1 = g[1];
  int32_t g2 = g[2];
  int32_t g3 = g[3];
  int32_t g4 = g[4];
  int32_t g5 = g[5];
  int32_t g6 = g[6];
  int32_t g7 = g[7];
  int32_t g8 = g[8];
  int32_t g9 = g[9];
  int32_t g1_19 = 19 * g1; /* 1.959375*2^29 */
  int32_t g2_19 = 19 * g2; /* 1.959375*2^30; still ok */
  int32_t g3_19 = 19 * g3;
  int32_t g4_19 = 19 * g4;
  int32_t g5_19 = 19 * g5;
  int32_t g6_19 = 19 * g6;
  int32_t g7_19 = 19 * g7;
  int32_t g8_19 = 19 * g8;
  int32_t g9_19 = 19 * g9;
  int32_t f1_2 = 2 * f1;
  int32_t f3_2 = 2 * f3;
  int32_t f5_2 = 2 * f5;
  int32_t f7_2 = 2 * f7;
  int32_t f9_2 = 2 * f9;
  int64_t f0g0    = f0   * (int64_t) g0;
  int64_t f0g1    = f0   * (int64_t) g1;
  int64_t f0g2    = f0   * (int64_t) g2;
  int64_t f0g3    = f0   * (int64_t) g3;
  int64_t f0g4    = f0   * (int64_t) g4;
  int64_t f0g5    = f0   * (int64_t) g5;
  int64_t f0g6    = f0   * (int64_t) g6;
  int64_t f0g7    = f0   * (int64_t) g7;
  int64_t f0g8    = f0   * (int64_t) g8;
  int64_t f0g9    = f0   * (int64_t) g9;
  int64_t f1g0    = f1   * (int64_t) g0;
  int64_t f1g1_2  = f1_2 * (int64_t) g1;
  int64_t f1g2    = f1   * (int64_t) g2;
  int64_t f1g3_2  = f1_2 * (int64_t) g3;
  int64_t f1g4    = f1   * (int64_t) g4;
  int64_t f1g5_2  = f1_2 * (int64_t) g5;
  int64_t f1g6    = f1   * (int64_t) g6;
  int64_t f1g7_2  = f1_2 * (int64_t) g7;
  int64_t f1g8    = f1   * (int64_t) g8;
  int64_t f1g9_38 = f1_2 * (int64_t) g9_19;
  int64_t f2g0    = f2   * (int64_t) g0;
  int64_t f2g1    = f2   * (int64_t) g1;
  int64_t f2g2    = f2   * (int64_t) g2;
  int64_t f2g3    = f2   * (int64_t) g3;
  int64_t f2g4    = f2   * (int64_t) g4;
  int64_t f2g5    = f2   * (int64_t) g5;
  int64_t f2g6    = f2   * (int64_t) g6;
  int64_t f2g7    = f2   * (int64_t) g7;
  int64_t f2g8_19 = f2   * (int64_t) g8_19;
  int64_t f2g9_19 = f2   * (int64_t) g9_19;
  int64_t f3g0    = f3   * (int64_t) g0;
  int64_t f3g1_2  = f3_2 * (int64_t) g1;
  int64_t f3g2    = f3   * (int64_t) g2;
  int64_t f3g3_2  = f3_2 * (int64_t) g3;
  int64_t f3g4    = f3   * (int64_t) g4;
  int64_t f3g5_2  = f3_2 * (int64_t) g5;
  int64_t f3g6    = f3   * (int64_t) g6;
  int64_t f3g7_38 = f3_2 * (int64_t) g7_19;
  int64_t f3g8_19 = f3   * (int64_t) g8_19;
  int64_t f3g9_38 = f3_2 * (int64_t) g9_19;
  int64_t f4g0    = f4   * (int64_t) g0;
  int64_t f4g1    = f4   * (int64_t) g1;
  int64_t f4g2    = f4   * (int64_t) g2;
  int64_t f4g3    = f4   * (int64_t) g3;
  int64_t f4g4    = f4   * (int64_t) g4;
  int64_t f4g5    = f4   * (int64_t) g5;
  int64_t f4g6_19 = f4   * (int64_t) g6_19;
  int64_t f4g7_19 = f4   * (int64_t) g7_19;
  int64_t f4g8_19 = f4   * (int64_t) g8_19;
  int64_t f4g9_19 = f4   * (int64_t) g9_19;
  int64_t f5g0    = f5   * (int64_t) g0;
  int64_t f5g1_2  = f5_2 * (int64_t) g1;
  int64_t f5g2    = f5   * (int64_t) g2;
  int64_t f5g3_2  = f5_2 * (int64_t) g3;
  int64_t f5g4    = f5   * (int64_t) g4;
  int64_t f5g5_38 = f5_2 * (int64_t) g5_19;
  int64_t f5g6_19 = f5   * (int64_t) g6_19;
  int64_t f5g7_38 = f5_2 * (int64_t) g7_19;
  int64_t f5g8_19 = f5   * (int64_t) g8_19;
  int64_t f5g9_38 = f5_2 * (int64_t) g9_19;
  int64_t f6g0    = f6   * (int64_t) g0;
  int64_t f6g1    = f6   * (int64_t) g1;
  int64_t f6g2    = f6   * (int64_t) g2;
  int64_t f6g3    = f6   * (int64_t) g3;
  int64_t f6g4_19 = f6   * (int64_t) g4_19;
  int64_t f6g5_19 = f6   * (int64_t) g5_19;
  int64_t f6g6_19 = f6   * (int64_t) g6_19;
  int64_t f6g7_19 = f6   * (int64_t) g7_19;
  int64_t f6g8_19 = f6   * (int64_t) g8_19;
  int64_t f6g9_19 = f6   * (int64_t) g9_19;
  int64_t f7g0    = f7   * (int64_t) g0;
  int64_t f7g1_2  = f7_2 * (int64_t) g1;
  int64_t f7g2    = f7   * (int64_t) g2;
  int64_t f7g3_38 = f7_2 * (int64_t) g3_19;
  int64_t f7g4_19 = f7   * (int64_t) g4_19;
  int64_t f7g5_38 = f7_2 * (int64_t) g5_19;
  int64_t f7g6_19 = f7   * (int64_t) g6_19;
  int64_t f7g7_38 = f7_2 * (int64_t) g7_19;
  int64_t f7g8_19 = f7   * (int64_t) g8_19;
  int64_t f7g9_38 = f7_2 * (int64_t) g9_19;
  int64_t f8g0    = f8   * (int64_t) g0;
  int64_t f8g1    = f8   * (int64_t) g1;
  int64_t f8g2_19 = f8   * (int64_t) g2_19;
  int64_t f8g3_19 = f8   * (int64_t) g3_19;
  int64_t f8g4_19 = f8   * (int64_t) g4_19;
  int64_t f8g5_19 = f8   * (int64_t) g5_19;
  int64_t f8g6_19 = f8   * (int64_t) g6_19;
  int64_t f8g7_19 = f8   * (int64_t) g7_19;
  int64_t f8g8_19 = f8   * (int64_t) g8_19;
  int64_t f8g9_19 = f8   * (int64_t) g9_19;
  int64_t f9g0    = f9   * (int64_t) g0;
  int64_t f9g1_38 = f9_2 * (int64_t) g1_19;
  int64_t f9g2_19 = f9   * (int64_t) g2_19;
  int64_t f9g3_38 = f9_2 * (int64_t) g3_19;
  int64_t f9g4_19 = f9   * (int64_t) g4_19;
  int64_t f9g5_38 = f9_2 * (int64_t) g5_19;
  int64_t f9g6_19 = f9   * (int64_t) g6_19;
  int64_t f9g7_38 = f9_2 * (int64_t) g7_19;
  int64_t f9g8_19 = f9   * (int64_t) g8_19;
  int64_t f9g9_38 = f9_2 * (int64_t) g9_19;
  int64_t h0 = f0g0+f1g9_38+f2g8_19+f3g7_38+f4g6_19+f5g5_38+f6g4_19+f7g3_38+f8g2_19+f9g1_38;
  int64_t h1 = f0g1+f1g0   +f2g9_19+f3g8_19+f4g7_19+f5g6_19+f6g5_19+f7g4_19+f8g3_19+f9g2_19;
  int64_t h2 = f0g2+f1g1_2 +f2g0   +f3g9_38+f4g8_19+f5g7_38+f6g6_19+f7g5_38+f8g4_19+f9g3_38;
  int64_t h3 = f0g3+f1g2   +f2g1   +f3g0   +f4g9_19+f5g8_19+f6g7_19+f7g6_19+f8g5_19+f9g4_19;
  int64_t h4 = f0g4+f1g3_2 +f2g2   +f3g1_2 +f4g0   +f5g9_38+f6g8_19+f7g7_38+f8g6_19+f9g5_38;
  int64_t h5 = f0g5+f1g4   +f2g3   +f3g2   +f4g1   +f5g0   +f6g9_19+f7g8_19+f8g7_19+f9g6_19;
  int64_t h6 = f0g6+f1g5_2 +f2g4   +f3g3_2 +f4g2   +f5g1_2 +f6g0   +f7g9_38+f8g8_19+f9g7_38;
  int64_t h7 = f0g7+f1g6   +f2g5   +f3g4   +f4g3   +f5g2   +f6g1   +f7g0   +f8g9_19+f9g8_19;
  int64_t h8 = f0g8+f1g7_2 +f2g6   +f3g5_2 +f4g4   +f5g3_2 +f6g2   +f7g1_2 +f8g0   +f9g9_38;
  int64_t h9 = f0g9+f1g8   +f2g7   +f3g6   +f4g5   +f5g4   +f6g3   +f7g2   +f8g1   +f9g0   ;
  int64_t carry0;
  int64_t carry1;
  int64_t carry2;
  int64_t carry3;
  int64_t carry4;
  int64_t carry5;
  int64_t carry6;
  int64_t carry7;
  int64_t carry8;
  int64_t carry9;

  /* |h0| <= (1.65*1.65*2^52*(1+19+19+19+19)+1.65*1.65*2^50*(38+38+38+38+38))
   *   i.e. |h0| <= 1.4*2^60; narrower ranges for h2, h4, h6, h8
   * |h1| <= (1.65*1.65*2^51*(1+1+19+19+19+19+19+19+19+19))
   *   i.e. |h1| <= 1.7*2^59; narrower ranges for h3, h5, h7, h9 */

  carry0 = (h0 + (int64_t) (1<<25)) >> 26; h1 += carry0; h0 -= carry0 << 26;
  carry4 = (h4 + (int64_t) (1<<25)) >> 26; h5 += carry4; h4 -= carry4 << 26;
  /* |h0| <= 2^25 */
  /* |h4| <= 2^25 */
  /* |h1| <= 1.71*2^59 */
  /* |h5| <= 1.71*2^59 */

  carry1 = (h1 + (int64_t) (1<<24)) >> 25; h2 += carry1; h1 -= carry1 << 25;
  carry5 = (h5 + (int64_t) (1<<24)) >> 25; h6 += carry5; h5 -= carry5 << 25;
  /* |h1| <= 2^24; from now on fits into int32 */
  /* |h5| <= 2^24; from now on fits into int32 */
  /* |h2| <= 1.41*2^60 */
  /* |h6| <= 1.41*2^60 */

  carry2 = (h2 + (int64_t) (1<<25)) >> 26; h3 += carry2; h2 -= carry2 << 26;
  carry6 = (h6 + (int64_t) (1<<25)) >> 26; h7 += carry6; h6 -= carry6 << 26;
  /* |h2| <= 2^25; from now on fits into int32 unchanged */
  /* |h6| <= 2^25; from now on fits into int32 unchanged */
  /* |h3| <= 1.71*2^59 */
  /* |h7| <= 1.71*2^59 */

  carry3 = (h3 + (int64_t) (1<<24)) >> 25; h4 += carry3; h3 -= carry3 << 25;
  carry7 = (h7 + (int64_t) (1<<24)) >> 25; h8 += carry7; h7 -= carry7 << 25;
  /* |h3| <= 2^24; from now on fits into int32 unchanged */
  /* |h7| <= 2^24; from now on fits into int32 unchanged */
  /* |h4| <= 1.72*2^34 */
  /* |h8| <= 1.41*2^60 */

  carry4 = (h4 + (int64_t) (1<<25)) >> 26; h5 += carry4; h4 -= carry4 << 26;
  carry8 = (h8 + (int64_t) (1<<25)) >> 26; h9 += carry8; h8 -= carry8 << 26;
  /* |h4| <= 2^25; from now on fits into int32 unchanged */
  /* |h8| <= 2^25; from now on fits into int32 unchanged */
  /* |h5| <= 1.01*2^24 */
  /* |h9| <= 1.71*2^59 */

  carry9 = (h9 + (int64_t) (1<<24)) >> 25; h0 += carry9 * 19; h9 -= carry9 << 25;
  /* |h9| <= 2^24; from now on fits into int32 unchanged */
  /* |h0| <= 1.1*2^39 */

  carry0 = (h0 + (int64_t) (1<<25)) >> 26; h1 += carry0; h0 -= carry0 << 26;
  /* |h0| <= 2^25; from now on fits into int32 unchanged */
  /* |h1| <= 1.01*2^24 */

  h[0] = h0;
  h[1] = h1;
  h[2] = h2;
  h[3] = h3;
  h[4] = h4;
  h[5] = h5;
  h[6] = h6;
  h[7] = h7;
  h[8] = h8;
  h[9] = h9;
}

/* h = f * f
 * Can overlap h with f.
 *
 * Preconditions:
 *    |f| bounded by 1.65*2^26,1.65*2^25,1.65*2^26,1.65*2^25,etc.
 *
 * Postconditions:
 *    |h| bounded by 1.01*2^25,1.01*2^24,1.01*2^25,1.01*2^24,etc.
 *
 * See fe_mul.c for discussion of implementation strategy. */
static void fe_sq(fe h, const fe f) {
  int32_t f0 = f[0];
  int32_t f1 = f[1];
  int32_t f2 = f[2];
  int32_t f3 = f[3];
  int32_t f4 = f[4];
  int32_t f5 = f[5];
  int32_t f6 = f[6];
  int32_t f7 = f[7];
  int32_t f8 = f[8];
  int32_t f9 = f[9];
  int32_t f0_2 = 2 * f0;
  int32_t f1_2 = 2 * f1;
  int32_t f2_2 = 2 * f2;
  int32_t f3_2 = 2 * f3;
  int32_t f4_2 = 2 * f4;
  int32_t f5_2 = 2 * f5;
  int32_t f6_2 = 2 * f6;
  int32_t f7_2 = 2 * f7;
  int32_t f5_38 = 38 * f5; /* 1.959375*2^30 */
  int32_t f6_19 = 19 * f6; /* 1.959375*2^30 */
  int32_t f7_38 = 38 * f7; /* 1.959375*2^30 */
  int32_t f8_19 = 19 * f8; /* 1.959375*2^30 */
  int32_t f9_38 = 38 * f9; /* 1.959375*2^30 */
  int64_t f0f0    = f0   * (int64_t) f0;
  int64_t f0f1_2  = f0_2 * (int64_t) f1;
  int64_t f0f2_2  = f0_2 * (int64_t) f2;
  int64_t f0f3_2  = f0_2 * (int64_t) f3;
  int64_t f0f4_2  = f0_2 * (int64_t) f4;
  int64_t f0f5_2  = f0_2 * (int64_t) f5;
  int64_t f0f6_2  = f0_2 * (int64_t) f6;
  int64_t f0f7_2  = f0_2 * (int64_t) f7;
  int64_t f0f8_2  = f0_2 * (int64_t) f8;
  int64_t f0f9_2  = f0_2 * (int64_t) f9;
  int64_t f1f1_2  = f1_2 * (int64_t) f1;
  int64_t f1f2_2  = f1_2 * (int64_t) f2;
  int64_t f1f3_4  = f1_2 * (int64_t) f3_2;
  int64_t f1f4_2  = f1_2 * (int64_t) f4;
  int64_t f1f5_4  = f1_2 * (int64_t) f5_2;
  int64_t f1f6_2  = f1_2 * (int64_t) f6;
  int64_t f1f7_4  = f1_2 * (int64_t) f7_2;
  int64_t f1f8_2  = f1_2 * (int64_t) f8;
  int64_t f1f9_76 = f1_2 * (int64_t) f9_38;
  int64_t f2f2    = f2   * (int64_t) f2;
  int64_t f2f3_2  = f2_2 * (int64_t) f3;
  int64_t f2f4_2  = f2_2 * (int64_t) f4;
  int64_t f2f5_2  = f2_2 * (int64_t) f5;
  int64_t f2f6_2  = f2_2 * (int64_t) f6;
  int64_t f2f7_2  = f2_2 * (int64_t) f7;
  int64_t f2f8_38 = f2_2 * (int64_t) f8_19;
  int64_t f2f9_38 = f2   * (int64_t) f9_38;
  int64_t f3f3_2  = f3_2 * (int64_t) f3;
  int64_t f3f4_2  = f3_2 * (int64_t) f4;
  int64_t f3f5_4  = f3_2 * (int64_t) f5_2;
  int64_t f3f6_2  = f3_2 * (int64_t) f6;
  int64_t f3f7_76 = f3_2 * (int64_t) f7_38;
  int64_t f3f8_38 = f3_2 * (int64_t) f8_19;
  int64_t f3f9_76 = f3_2 * (int64_t) f9_38;
  int64_t f4f4    = f4   * (int64_t) f4;
  int64_t f4f5_2  = f4_2 * (int64_t) f5;
  int64_t f4f6_38 = f4_2 * (int64_t) f6_19;
  int64_t f4f7_38 = f4   * (int64_t) f7_38;
  int64_t f4f8_38 = f4_2 * (int64_t) f8_19;
  int64_t f4f9_38 = f4   * (int64_t) f9_38;
  int64_t f5f5_38 = f5   * (int64_t) f5_38;
  int64_t f5f6_38 = f5_2 * (int64_t) f6_19;
  int64_t f5f7_76 = f5_2 * (int64_t) f7_38;
  int64_t f5f8_38 = f5_2 * (int64_t) f8_19;
  int64_t f5f9_76 = f5_2 * (int64_t) f9_38;
  int64_t f6f6_19 = f6   * (int64_t) f6_19;
  int64_t f6f7_38 = f6   * (int64_t) f7_38;
  int64_t f6f8_38 = f6_2 * (int64_t) f8_19;
  int64_t f6f9_38 = f6   * (int64_t) f9_38;
  int64_t f7f7_38 = f7   * (int64_t) f7_38;
  int64_t f7f8_38 = f7_2 * (int64_t) f8_19;
  int64_t f7f9_76 = f7_2 * (int64_t) f9_38;
  int64_t f8f8_19 = f8   * (int64_t) f8_19;
  int64_t f8f9_38 = f8   * (int64_t) f9_38;
  int64_t f9f9_38 = f9   * (int64_t) f9_38;
  int64_t h0 = f0f0  +f1f9_76+f2f8_38+f3f7_76+f4f6_38+f5f5_38;
  int64_t h1 = f0f1_2+f2f9_38+f3f8_38+f4f7_38+f5f6_38;
  int64_t h2 = f0f2_2+f1f1_2 +f3f9_76+f4f8_38+f5f7_76+f6f6_19;
  int64_t h3 = f0f3_2+f1f2_2 +f4f9_38+f5f8_38+f6f7_38;
  int64_t h4 = f0f4_2+f1f3_4 +f2f2   +f5f9_76+f6f8_38+f7f7_38;
  int64_t h5 = f0f5_2+f1f4_2 +f2f3_2 +f6f9_38+f7f8_38;
  int64_t h6 = f0f6_2+f1f5_4 +f2f4_2 +f3f3_2 +f7f9_76+f8f8_19;
  int64_t h7 = f0f7_2+f1f6_2 +f2f5_2 +f3f4_2 +f8f9_38;
  int64_t h8 = f0f8_2+f1f7_4 +f2f6_2 +f3f5_4 +f4f4   +f9f9_38;
  int64_t h9 = f0f9_2+f1f8_2 +f2f7_2 +f3f6_2 +f4f5_2;
  int64_t carry0;
  int64_t carry1;
  int64_t carry2;
  int64_t carry3;
  int64_t carry4;
  int64_t carry5;
  int64_t carry6;
  int64_t carry7;
  int64_t carry8;
  int64_t carry9;

  carry0 = (h0 + (int64_t) (1<<25)) >> 26; h1 += carry0; h0 -= carry0 << 26;
  carry4 = (h4 + (int64_t) (1<<25)) >> 26; h5 += carry4; h4 -= carry4 << 26;

  carry1 = (h1 + (int64_t) (1<<24)) >> 25; h2 += carry1; h1 -= carry1 << 25;
  carry5 = (h5 + (int64_t) (1<<24)) >> 25; h6 += carry5; h5 -= carry5 << 25;

  carry2 = (h2 + (int64_t) (1<<25)) >> 26; h3 += carry2; h2 -= carry2 << 26;
  carry6 = (h6 + (int64_t) (1<<25)) >> 26; h7 += carry6; h6 -= carry6 << 26;

  carry3 = (h3 + (int64_t) (1<<24)) >> 25; h4 += carry3; h3 -= carry3 << 25;
  carry7 = (h7 + (int64_t) (1<<24)) >> 25; h8 += carry7; h7 -= carry7 << 25;

  carry4 = (h4 + (int64_t) (1<<25)) >> 26; h5 += carry4; h4 -= carry4 << 26;
  carry8 = (h8 + (int64_t) (1<<25)) >> 26; h9 += carry8; h8 -= carry8 << 26;

  carry9 = (h9 + (int64_t) (1<<24)) >> 25; h0 += carry9 * 19; h9 -= carry9 << 25;

  carry0 = (h0 + (int64_t) (1<<25)) >> 26; h1 += carry0; h0 -= carry0 << 26;

  h[0] = h0;
  h[1] = h1;
  h[2] = h2;
  h[3] = h3;
  h[4] = h4;
  h[5] = h5;
  h[6] = h6;
  h[7] = h7;
  h[8] = h8;
  h[9] = h9;
}

static void fe_invert(fe out, const fe z) {
  fe t0;
  fe t1;
  fe t2;
  fe t3;
  int i;

  fe_sq(t0, z);
  for (i = 1; i < 1; ++i) {
    fe_sq(t0, t0);
  }
  fe_sq(t1, t0);
  for (i = 1; i < 2; ++i) {
    fe_sq(t1, t1);
  }
  fe_mul(t1, z, t1);
  fe_mul(t0, t0, t1);
  fe_sq(t2, t0);
  for (i = 1; i < 1; ++i) {
    fe_sq(t2, t2);
  }
  fe_mul(t1, t1, t2);
  fe_sq(t2, t1);
  for (i = 1; i < 5; ++i) {
    fe_sq(t2, t2);
  }
  fe_mul(t1, t2, t1);
  fe_sq(t2, t1);
  for (i = 1; i < 10; ++i) {
    fe_sq(t2, t2);
  }
  fe_mul(t2, t2, t1);
  fe_sq(t3, t2);
  for (i = 1; i < 20; ++i) {
    fe_sq(t3, t3);
  }
  fe_mul(t2, t3, t2);
  fe_sq(t2, t2);
  for (i = 1; i < 10; ++i) {
    fe_sq(t2, t2);
  }
  fe_mul(t1, t2, t1);
  fe_sq(t2, t1);
  for (i = 1; i < 50; ++i) {
    fe_sq(t2, t2);
  }
  fe_mul(t2, t2, t1);
  fe_sq(t3, t2);
  for (i = 1; i < 100; ++i) {
    fe_sq(t3, t3);
  }
  fe_mul(t2, t3, t2);
  fe_sq(t2, t2);
  for (i = 1; i < 50; ++i) {
    fe_sq(t2, t2);
  }
  fe_mul(t1, t2, t1);
  fe_sq(t1, t1);
  for (i = 1; i < 5; ++i) {
    fe_sq(t1, t1);
  }
  fe_mul(out, t1, t0);
}

/* h = f * 121666
 * Can overlap h with f.
 *
 * Preconditions:
 *    |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
 *
 * Postconditions:
 *    |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc. */
static void fe_mul121666(fe h, fe f) {
  int32_t f0 = f[0];
  int32_t f1 = f[1];
  int32_t f2 = f[2];
  int32_t f3 = f[3];
  int32_t f4 = f[4];
  int32_t f5 = f[5];
  int32_t f6 = f[6];
  int32_t f7 = f[7];
  int32_t f8 = f[8];
  int32_t f9 = f[9];
  int64_t h0 = f0 * (int64_t) 121666;
  int64_t h1 = f1 * (int64_t) 121666;
  int64_t h2 = f2 * (int64_t) 121666;
  int64_t h3 = f3 * (int64_t) 121666;
  int64_t h4 = f4 * (int64_t) 121666;
  int64_t h5 = f5 * (int64_t) 121666;
  int64_t h6 = f6 * (int64_t) 121666;
  int64_t h7 = f7 * (int64_t) 121666;
  int64_t h8 = f8 * (int64_t) 121666;
  int64_t h9 = f9 * (int64_t) 121666;
  int64_t carry0;
  int64_t carry1;
  int64_t carry2;
  int64_t carry3;
  int64_t carry4;
  int64_t carry5;
  int64_t carry6;
  int64_t carry7;
  int64_t carry8;
  int64_t carry9;

  carry9 = (h9 + (int64_t) (1<<24)) >> 25; h0 += carry9 * 19; h9 -= carry9 << 25;
  carry1 = (h1 + (int64_t) (1<<24)) >> 25; h2 += carry1; h1 -= carry1 << 25;
  carry3 = (h3 + (int64_t) (1<<24)) >> 25; h4 += carry3; h3 -= carry3 << 25;
  carry5 = (h5 + (int64_t) (1<<24)) >> 25; h6 += carry5; h5 -= carry5 << 25;
  carry7 = (h7 + (int64_t) (1<<24)) >> 25; h8 += carry7; h7 -= carry7 << 25;

  carry0 = (h0 + (int64_t) (1<<25)) >> 26; h1 += carry0; h0 -= carry0 << 26;
  carry2 = (h2 + (int64_t) (1<<25)) >> 26; h3 += carry2; h2 -= carry2 << 26;
  carry4 = (h4 + (int64_t) (1<<25)) >> 26; h5 += carry4; h4 -= carry4 << 26;
  carry6 = (h6 + (int64_t) (1<<25)) >> 26; h7 += carry6; h6 -= carry6 << 26;
  carry8 = (h8 + (int64_t) (1<<25)) >> 26; h9 += carry8; h8 -= carry8 << 26;

  h[0] = h0;
  h[1] = h1;
  h[2] = h2;
  h[3] = h3;
  h[4] = h4;
  h[5] = h5;
  h[6] = h6;
  h[7] = h7;
  h[8] = h8;
  h[9] = h9;
}

/* h = -f
 *
 * Preconditions:
 *    |f| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
 *
 * Postconditions:
 *    |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc. */
static void fe_neg(fe h, const fe f) {
  unsigned i;
  for (i = 0; i < 10; i++) {
    h[i] = -f[i];
  }
}

/* Replace (f,g) with (g,g) if b == 1;
 * replace (f,g) with (f,g) if b == 0.
 *
 * Preconditions: b in {0,1}. */
static void fe_cmov(fe f, const fe g, unsigned b) {
  b = 0-b;
  unsigned i;
  for (i = 0; i < 10; i++) {
    int32_t x = f[i] ^ g[i];
    x &= b;
    f[i] ^= x;
  }
}

/* return 0 if f == 0
 * return 1 if f != 0
 *
 * Preconditions:
 *    |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc. */
static int fe_isnonzero(const fe f) {
  uint8_t s[32];
  fe_tobytes(s, f);

  static const uint8_t zero[32] = {0};
  return CRYPTO_memcmp(s, zero, sizeof(zero)) != 0;
}

/* return 1 if f is in {1,3,5,...,q-2}
 * return 0 if f is in {0,2,4,...,q-1}
 *
 * Preconditions:
 *    |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc. */
static int fe_isnegative(const fe f) {
  uint8_t s[32];
  fe_tobytes(s, f);
  return s[0] & 1;
}

/* h = 2 * f * f
 * Can overlap h with f.
 *
 * Preconditions:
 *    |f| bounded by 1.65*2^26,1.65*2^25,1.65*2^26,1.65*2^25,etc.
 *
 * Postconditions:
 *    |h| bounded by 1.01*2^25,1.01*2^24,1.01*2^25,1.01*2^24,etc.
 *
 * See fe_mul.c for discussion of implementation strategy. */
static void fe_sq2(fe h, const fe f) {
  int32_t f0 = f[0];
  int32_t f1 = f[1];
  int32_t f2 = f[2];
  int32_t f3 = f[3];
  int32_t f4 = f[4];
  int32_t f5 = f[5];
  int32_t f6 = f[6];
  int32_t f7 = f[7];
  int32_t f8 = f[8];
  int32_t f9 = f[9];
  int32_t f0_2 = 2 * f0;
  int32_t f1_2 = 2 * f1;
  int32_t f2_2 = 2 * f2;
  int32_t f3_2 = 2 * f3;
  int32_t f4_2 = 2 * f4;
  int32_t f5_2 = 2 * f5;
  int32_t f6_2 = 2 * f6;
  int32_t f7_2 = 2 * f7;
  int32_t f5_38 = 38 * f5; /* 1.959375*2^30 */
  int32_t f6_19 = 19 * f6; /* 1.959375*2^30 */
  int32_t f7_38 = 38 * f7; /* 1.959375*2^30 */
  int32_t f8_19 = 19 * f8; /* 1.959375*2^30 */
  int32_t f9_38 = 38 * f9; /* 1.959375*2^30 */
  int64_t f0f0    = f0   * (int64_t) f0;
  int64_t f0f1_2  = f0_2 * (int64_t) f1;
  int64_t f0f2_2  = f0_2 * (int64_t) f2;
  int64_t f0f3_2  = f0_2 * (int64_t) f3;
  int64_t f0f4_2  = f0_2 * (int64_t) f4;
  int64_t f0f5_2  = f0_2 * (int64_t) f5;
  int64_t f0f6_2  = f0_2 * (int64_t) f6;
  int64_t f0f7_2  = f0_2 * (int64_t) f7;
  int64_t f0f8_2  = f0_2 * (int64_t) f8;
  int64_t f0f9_2  = f0_2 * (int64_t) f9;
  int64_t f1f1_2  = f1_2 * (int64_t) f1;
  int64_t f1f2_2  = f1_2 * (int64_t) f2;
  int64_t f1f3_4  = f1_2 * (int64_t) f3_2;
  int64_t f1f4_2  = f1_2 * (int64_t) f4;
  int64_t f1f5_4  = f1_2 * (int64_t) f5_2;
  int64_t f1f6_2  = f1_2 * (int64_t) f6;
  int64_t f1f7_4  = f1_2 * (int64_t) f7_2;
  int64_t f1f8_2  = f1_2 * (int64_t) f8;
  int64_t f1f9_76 = f1_2 * (int64_t) f9_38;
  int64_t f2f2    = f2   * (int64_t) f2;
  int64_t f2f3_2  = f2_2 * (int64_t) f3;
  int64_t f2f4_2  = f2_2 * (int64_t) f4;
  int64_t f2f5_2  = f2_2 * (int64_t) f5;
  int64_t f2f6_2  = f2_2 * (int64_t) f6;
  int64_t f2f7_2  = f2_2 * (int64_t) f7;
  int64_t f2f8_38 = f2_2 * (int64_t) f8_19;
  int64_t f2f9_38 = f2   * (int64_t) f9_38;
  int64_t f3f3_2  = f3_2 * (int64_t) f3;
  int64_t f3f4_2  = f3_2 * (int64_t) f4;
  int64_t f3f5_4  = f3_2 * (int64_t) f5_2;
  int64_t f3f6_2  = f3_2 * (int64_t) f6;
  int64_t f3f7_76 = f3_2 * (int64_t) f7_38;
  int64_t f3f8_38 = f3_2 * (int64_t) f8_19;
  int64_t f3f9_76 = f3_2 * (int64_t) f9_38;
  int64_t f4f4    = f4   * (int64_t) f4;
  int64_t f4f5_2  = f4_2 * (int64_t) f5;
  int64_t f4f6_38 = f4_2 * (int64_t) f6_19;
  int64_t f4f7_38 = f4   * (int64_t) f7_38;
  int64_t f4f8_38 = f4_2 * (int64_t) f8_19;
  int64_t f4f9_38 = f4   * (int64_t) f9_38;
  int64_t f5f5_38 = f5   * (int64_t) f5_38;
  int64_t f5f6_38 = f5_2 * (int64_t) f6_19;
  int64_t f5f7_76 = f5_2 * (int64_t) f7_38;
  int64_t f5f8_38 = f5_2 * (int64_t) f8_19;
  int64_t f5f9_76 = f5_2 * (int64_t) f9_38;
  int64_t f6f6_19 = f6   * (int64_t) f6_19;
  int64_t f6f7_38 = f6   * (int64_t) f7_38;
  int64_t f6f8_38 = f6_2 * (int64_t) f8_19;
  int64_t f6f9_38 = f6   * (int64_t) f9_38;
  int64_t f7f7_38 = f7   * (int64_t) f7_38;
  int64_t f7f8_38 = f7_2 * (int64_t) f8_19;
  int64_t f7f9_76 = f7_2 * (int64_t) f9_38;
  int64_t f8f8_19 = f8   * (int64_t) f8_19;
  int64_t f8f9_38 = f8   * (int64_t) f9_38;
  int64_t f9f9_38 = f9   * (int64_t) f9_38;
  int64_t h0 = f0f0  +f1f9_76+f2f8_38+f3f7_76+f4f6_38+f5f5_38;
  int64_t h1 = f0f1_2+f2f9_38+f3f8_38+f4f7_38+f5f6_38;
  int64_t h2 = f0f2_2+f1f1_2 +f3f9_76+f4f8_38+f5f7_76+f6f6_19;
  int64_t h3 = f0f3_2+f1f2_2 +f4f9_38+f5f8_38+f6f7_38;
  int64_t h4 = f0f4_2+f1f3_4 +f2f2   +f5f9_76+f6f8_38+f7f7_38;
  int64_t h5 = f0f5_2+f1f4_2 +f2f3_2 +f6f9_38+f7f8_38;
  int64_t h6 = f0f6_2+f1f5_4 +f2f4_2 +f3f3_2 +f7f9_76+f8f8_19;
  int64_t h7 = f0f7_2+f1f6_2 +f2f5_2 +f3f4_2 +f8f9_38;
  int64_t h8 = f0f8_2+f1f7_4 +f2f6_2 +f3f5_4 +f4f4   +f9f9_38;
  int64_t h9 = f0f9_2+f1f8_2 +f2f7_2 +f3f6_2 +f4f5_2;
  int64_t carry0;
  int64_t carry1;
  int64_t carry2;
  int64_t carry3;
  int64_t carry4;
  int64_t carry5;
  int64_t carry6;
  int64_t carry7;
  int64_t carry8;
  int64_t carry9;

  h0 += h0;
  h1 += h1;
  h2 += h2;
  h3 += h3;
  h4 += h4;
  h5 += h5;
  h6 += h6;
  h7 += h7;
  h8 += h8;
  h9 += h9;

  carry0 = (h0 + (int64_t) (1<<25)) >> 26; h1 += carry0; h0 -= carry0 << 26;
  carry4 = (h4 + (int64_t) (1<<25)) >> 26; h5 += carry4; h4 -= carry4 << 26;

  carry1 = (h1 + (int64_t) (1<<24)) >> 25; h2 += carry1; h1 -= carry1 << 25;
  carry5 = (h5 + (int64_t) (1<<24)) >> 25; h6 += carry5; h5 -= carry5 << 25;

  carry2 = (h2 + (int64_t) (1<<25)) >> 26; h3 += carry2; h2 -= carry2 << 26;
  carry6 = (h6 + (int64_t) (1<<25)) >> 26; h7 += carry6; h6 -= carry6 << 26;

  carry3 = (h3 + (int64_t) (1<<24)) >> 25; h4 += carry3; h3 -= carry3 << 25;
  carry7 = (h7 + (int64_t) (1<<24)) >> 25; h8 += carry7; h7 -= carry7 << 25;

  carry4 = (h4 + (int64_t) (1<<25)) >> 26; h5 += carry4; h4 -= carry4 << 26;
  carry8 = (h8 + (int64_t) (1<<25)) >> 26; h9 += carry8; h8 -= carry8 << 26;

  carry9 = (h9 + (int64_t) (1<<24)) >> 25; h0 += carry9 * 19; h9 -= carry9 << 25;

  carry0 = (h0 + (int64_t) (1<<25)) >> 26; h1 += carry0; h0 -= carry0 << 26;

  h[0] = h0;
  h[1] = h1;
  h[2] = h2;
  h[3] = h3;
  h[4] = h4;
  h[5] = h5;
  h[6] = h6;
  h[7] = h7;
  h[8] = h8;
  h[9] = h9;
}

static void fe_pow22523(fe out, const fe z) {
  fe t0;
  fe t1;
  fe t2;
  int i;

  fe_sq(t0, z);
  for (i = 1; i < 1; ++i) {
    fe_sq(t0, t0);
  }
  fe_sq(t1, t0);
  for (i = 1; i < 2; ++i) {
    fe_sq(t1, t1);
  }
  fe_mul(t1, z, t1);
  fe_mul(t0, t0, t1);
  fe_sq(t0, t0);
  for (i = 1; i < 1; ++i) {
    fe_sq(t0, t0);
  }
  fe_mul(t0, t1, t0);
  fe_sq(t1, t0);
  for (i = 1; i < 5; ++i) {
    fe_sq(t1, t1);
  }
  fe_mul(t0, t1, t0);
  fe_sq(t1, t0);
  for (i = 1; i < 10; ++i) {
    fe_sq(t1, t1);
  }
  fe_mul(t1, t1, t0);
  fe_sq(t2, t1);
  for (i = 1; i < 20; ++i) {
    fe_sq(t2, t2);
  }
  fe_mul(t1, t2, t1);
  fe_sq(t1, t1);
  for (i = 1; i < 10; ++i) {
    fe_sq(t1, t1);
  }
  fe_mul(t0, t1, t0);
  fe_sq(t1, t0);
  for (i = 1; i < 50; ++i) {
    fe_sq(t1, t1);
  }
  fe_mul(t1, t1, t0);
  fe_sq(t2, t1);
  for (i = 1; i < 100; ++i) {
    fe_sq(t2, t2);
  }
  fe_mul(t1, t2, t1);
  fe_sq(t1, t1);
  for (i = 1; i < 50; ++i) {
    fe_sq(t1, t1);
  }
  fe_mul(t0, t1, t0);
  fe_sq(t0, t0);
  for (i = 1; i < 2; ++i) {
    fe_sq(t0, t0);
  }
  fe_mul(out, t0, z);
}

/* ge means group element.

 * Here the group is the set of pairs (x,y) of field elements (see fe.h)
 * satisfying -x^2 + y^2 = 1 + d x^2y^2
 * where d = -121665/121666.
 *
 * Representations:
 *   ge_p2 (projective): (X:Y:Z) satisfying x=X/Z, y=Y/Z
 *   ge_p3 (extended): (X:Y:Z:T) satisfying x=X/Z, y=Y/Z, XY=ZT
 *   ge_p1p1 (completed): ((X:Z),(Y:T)) satisfying x=X/Z, y=Y/T
 *   ge_precomp (Duif): (y+x,y-x,2dxy) */

typedef struct {
  fe X;
  fe Y;
  fe Z;
} ge_p2;

typedef struct {
  fe X;
  fe Y;
  fe Z;
  fe T;
} ge_p3;

typedef struct {
  fe X;
  fe Y;
  fe Z;
  fe T;
} ge_p1p1;

typedef struct {
  fe yplusx;
  fe yminusx;
  fe xy2d;
} ge_precomp;

typedef struct {
  fe YplusX;
  fe YminusX;
  fe Z;
  fe T2d;
} ge_cached;

static void ge_tobytes(uint8_t *s, const ge_p2 *h) {
  fe recip;
  fe x;
  fe y;

  fe_invert(recip, h->Z);
  fe_mul(x, h->X, recip);
  fe_mul(y, h->Y, recip);
  fe_tobytes(s, y);
  s[31] ^= fe_isnegative(x) << 7;
}

static void ge_p3_tobytes(uint8_t *s, const ge_p3 *h) {
  fe recip;
  fe x;
  fe y;

  fe_invert(recip, h->Z);
  fe_mul(x, h->X, recip);
  fe_mul(y, h->Y, recip);
  fe_tobytes(s, y);
  s[31] ^= fe_isnegative(x) << 7;
}

static const fe d = {-10913610, 13857413, -15372611, 6949391,   114729,
                     -8787816,  -6275908, -3247719,  -18696448, -12055116};

static const fe sqrtm1 = {-32595792, -7943725,  9377950,  3500415, 12389472,
                          -272473,   -25146209, -2005654, 326686,  11406482};

static int ge_frombytes_negate_vartime(ge_p3 *h, const uint8_t *s) {
  fe u;
  fe v;
  fe v3;
  fe vxx;
  fe check;

  fe_frombytes(h->Y, s);
  fe_1(h->Z);
  fe_sq(u, h->Y);
  fe_mul(v, u, d);
  fe_sub(u, u, h->Z); /* u = y^2-1 */
  fe_add(v, v, h->Z); /* v = dy^2+1 */

  fe_sq(v3, v);
  fe_mul(v3, v3, v); /* v3 = v^3 */
  fe_sq(h->X, v3);
  fe_mul(h->X, h->X, v);
  fe_mul(h->X, h->X, u); /* x = uv^7 */

  fe_pow22523(h->X, h->X); /* x = (uv^7)^((q-5)/8) */
  fe_mul(h->X, h->X, v3);
  fe_mul(h->X, h->X, u); /* x = uv^3(uv^7)^((q-5)/8) */

  fe_sq(vxx, h->X);
  fe_mul(vxx, vxx, v);
  fe_sub(check, vxx, u); /* vx^2-u */
  if (fe_isnonzero(check)) {
    fe_add(check, vxx, u); /* vx^2+u */
    if (fe_isnonzero(check)) {
      return -1;
    }
    fe_mul(h->X, h->X, sqrtm1);
  }

  if (fe_isnegative(h->X) == (s[31] >> 7)) {
    fe_neg(h->X, h->X);
  }

  fe_mul(h->T, h->X, h->Y);
  return 0;
}

static void ge_p2_0(ge_p2 *h) {
  fe_0(h->X);
  fe_1(h->Y);
  fe_1(h->Z);
}

static void ge_p3_0(ge_p3 *h) {
  fe_0(h->X);
  fe_1(h->Y);
  fe_1(h->Z);
  fe_0(h->T);
}

static void ge_precomp_0(ge_precomp *h) {
  fe_1(h->yplusx);
  fe_1(h->yminusx);
  fe_0(h->xy2d);
}

/* r = p */
static void ge_p3_to_p2(ge_p2 *r, const ge_p3 *p) {
  fe_copy(r->X, p->X);
  fe_copy(r->Y, p->Y);
  fe_copy(r->Z, p->Z);
}

static const fe d2 = {-21827239, -5839606,  -30745221, 13898782, 229458,
                      15978800,  -12551817, -6495438,  29715968, 9444199};

/* r = p */
static void ge_p3_to_cached(ge_cached *r, const ge_p3 *p) {
  fe_add(r->YplusX, p->Y, p->X);
  fe_sub(r->YminusX, p->Y, p->X);
  fe_copy(r->Z, p->Z);
  fe_mul(r->T2d, p->T, d2);
}

/* r = p */
static void ge_p1p1_to_p2(ge_p2 *r, const ge_p1p1 *p) {
  fe_mul(r->X, p->X, p->T);
  fe_mul(r->Y, p->Y, p->Z);
  fe_mul(r->Z, p->Z, p->T);
}

/* r = p */
static void ge_p1p1_to_p3(ge_p3 *r, const ge_p1p1 *p) {
  fe_mul(r->X, p->X, p->T);
  fe_mul(r->Y, p->Y, p->Z);
  fe_mul(r->Z, p->Z, p->T);
  fe_mul(r->T, p->X, p->Y);
}

/* r = 2 * p */
static void ge_p2_dbl(ge_p1p1 *r, const ge_p2 *p) {
  fe t0;

  fe_sq(r->X, p->X);
  fe_sq(r->Z, p->Y);
  fe_sq2(r->T, p->Z);
  fe_add(r->Y, p->X, p->Y);
  fe_sq(t0, r->Y);
  fe_add(r->Y, r->Z, r->X);
  fe_sub(r->Z, r->Z, r->X);
  fe_sub(r->X, t0, r->Y);
  fe_sub(r->T, r->T, r->Z);
}

/* r = 2 * p */
static void ge_p3_dbl(ge_p1p1 *r, const ge_p3 *p) {
  ge_p2 q;
  ge_p3_to_p2(&q, p);
  ge_p2_dbl(r, &q);
}

/* r = p + q */
static void ge_madd(ge_p1p1 *r, const ge_p3 *p, const ge_precomp *q) {
  fe t0;

  fe_add(r->X, p->Y, p->X);
  fe_sub(r->Y, p->Y, p->X);
  fe_mul(r->Z, r->X, q->yplusx);
  fe_mul(r->Y, r->Y, q->yminusx);
  fe_mul(r->T, q->xy2d, p->T);
  fe_add(t0, p->Z, p->Z);
  fe_sub(r->X, r->Z, r->Y);
  fe_add(r->Y, r->Z, r->Y);
  fe_add(r->Z, t0, r->T);
  fe_sub(r->T, t0, r->T);
}

/* r = p - q */
static void ge_msub(ge_p1p1 *r, const ge_p3 *p, const ge_precomp *q) {
  fe t0;

  fe_add(r->X, p->Y, p->X);
  fe_sub(r->Y, p->Y, p->X);
  fe_mul(r->Z, r->X, q->yminusx);
  fe_mul(r->Y, r->Y, q->yplusx);
  fe_mul(r->T, q->xy2d, p->T);
  fe_add(t0, p->Z, p->Z);
  fe_sub(r->X, r->Z, r->Y);
  fe_add(r->Y, r->Z, r->Y);
  fe_sub(r->Z, t0, r->T);
  fe_add(r->T, t0, r->T);
}

/* r = p + q */
static void ge_add(ge_p1p1 *r, const ge_p3 *p, const ge_cached *q) {
  fe t0;

  fe_add(r->X, p->Y, p->X);
  fe_sub(r->Y, p->Y, p->X);
  fe_mul(r->Z, r->X, q->YplusX);
  fe_mul(r->Y, r->Y, q->YminusX);
  fe_mul(r->T, q->T2d, p->T);
  fe_mul(r->X, p->Z, q->Z);
  fe_add(t0, r->X, r->X);
  fe_sub(r->X, r->Z, r->Y);
  fe_add(r->Y, r->Z, r->Y);
  fe_add(r->Z, t0, r->T);
  fe_sub(r->T, t0, r->T);
}

/* r = p - q */
static void ge_sub(ge_p1p1 *r, const ge_p3 *p, const ge_cached *q) {
  fe t0;

  fe_add(r->X, p->Y, p->X);
  fe_sub(r->Y, p->Y, p->X);
  fe_mul(r->Z, r->X, q->YminusX);
  fe_mul(r->Y, r->Y, q->YplusX);
  fe_mul(r->T, q->T2d, p->T);
  fe_mul(r->X, p->Z, q->Z);
  fe_add(t0, r->X, r->X);
  fe_sub(r->X, r->Z, r->Y);
  fe_add(r->Y, r->Z, r->Y);
  fe_sub(r->Z, t0, r->T);
  fe_add(r->T, t0, r->T);
}

static uint8_t equal(signed char b, signed char c) {
  uint8_t ub = b;
  uint8_t uc = c;
  uint8_t x = ub ^ uc; /* 0: yes; 1..255: no */
  uint32_t y = x;      /* 0: yes; 1..255: no */
  y -= 1;              /* 4294967295: yes; 0..254: no */
  y >>= 31;            /* 1: yes; 0: no */
  return y;
}

static void cmov(ge_precomp *t, ge_precomp *u, uint8_t b) {
  fe_cmov(t->yplusx, u->yplusx, b);
  fe_cmov(t->yminusx, u->yminusx, b);
  fe_cmov(t->xy2d, u->xy2d, b);
}

#if defined(OPENSSL_SMALL)

/* This block of code replaces the standard base-point table with a much smaller
 * one. The standard table is 30,720 bytes while this one is just 960.
 *
 * This table contains 15 pairs of group elements, (x, y), where each field
 * element is serialised with |fe_tobytes|. If |i| is the index of the group
 * element then consider i+1 as a four-bit number: (i₀, i₁, i₂, i₃) (where i₀
 * is the most significant bit). The value of the group element is then:
 * (i₀×2^192 + i₁×2^128 + i₂×2^64 + i₃)G, where G is the generator. */
static const uint8_t kSmallPrecomp[15 * 2 * 32] = {
    0x1a, 0xd5, 0x25, 0x8f, 0x60, 0x2d, 0x56, 0xc9, 0xb2, 0xa7, 0x25, 0x95,
    0x60, 0xc7, 0x2c, 0x69, 0x5c, 0xdc, 0xd6, 0xfd, 0x31, 0xe2, 0xa4, 0xc0,
    0xfe, 0x53, 0x6e, 0xcd, 0xd3, 0x36, 0x69, 0x21, 0x58, 0x66, 0x66, 0x66,
    0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66,
    0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66,
    0x66, 0x66, 0x66, 0x66, 0x02, 0xa2, 0xed, 0xf4, 0x8f, 0x6b, 0x0b, 0x3e,
    0xeb, 0x35, 0x1a, 0xd5, 0x7e, 0xdb, 0x78, 0x00, 0x96, 0x8a, 0xa0, 0xb4,
    0xcf, 0x60, 0x4b, 0xd4, 0xd5, 0xf9, 0x2d, 0xbf, 0x88, 0xbd, 0x22, 0x62,
    0x13, 0x53, 0xe4, 0x82, 0x57, 0xfa, 0x1e, 0x8f, 0x06, 0x2b, 0x90, 0xba,
    0x08, 0xb6, 0x10, 0x54, 0x4f, 0x7c, 0x1b, 0x26, 0xed, 0xda, 0x6b, 0xdd,
    0x25, 0xd0, 0x4e, 0xea, 0x42, 0xbb, 0x25, 0x03, 0xa2, 0xfb, 0xcc, 0x61,
    0x67, 0x06, 0x70, 0x1a, 0xc4, 0x78, 0x3a, 0xff, 0x32, 0x62, 0xdd, 0x2c,
    0xab, 0x50, 0x19, 0x3b, 0xf2, 0x9b, 0x7d, 0xb8, 0xfd, 0x4f, 0x29, 0x9c,
    0xa7, 0x91, 0xba, 0x0e, 0x46, 0x5e, 0x51, 0xfe, 0x1d, 0xbf, 0xe5, 0xe5,
    0x9b, 0x95, 0x0d, 0x67, 0xf8, 0xd1, 0xb5, 0x5a, 0xa1, 0x93, 0x2c, 0xc3,
    0xde, 0x0e, 0x97, 0x85, 0x2d, 0x7f, 0xea, 0xab, 0x3e, 0x47, 0x30, 0x18,
    0x24, 0xe8, 0xb7, 0x60, 0xae, 0x47, 0x80, 0xfc, 0xe5, 0x23, 0xe7, 0xc2,
    0xc9, 0x85, 0xe6, 0x98, 0xa0, 0x29, 0x4e, 0xe1, 0x84, 0x39, 0x2d, 0x95,
    0x2c, 0xf3, 0x45, 0x3c, 0xff, 0xaf, 0x27, 0x4c, 0x6b, 0xa6, 0xf5, 0x4b,
    0x11, 0xbd, 0xba, 0x5b, 0x9e, 0xc4, 0xa4, 0x51, 0x1e, 0xbe, 0xd0, 0x90,
    0x3a, 0x9c, 0xc2, 0x26, 0xb6, 0x1e, 0xf1, 0x95, 0x7d, 0xc8, 0x6d, 0x52,
    0xe6, 0x99, 0x2c, 0x5f, 0x9a, 0x96, 0x0c, 0x68, 0x29, 0xfd, 0xe2, 0xfb,
    0xe6, 0xbc, 0xec, 0x31, 0x08, 0xec, 0xe6, 0xb0, 0x53, 0x60, 0xc3, 0x8c,
    0xbe, 0xc1, 0xb3, 0x8a, 0x8f, 0xe4, 0x88, 0x2b, 0x55, 0xe5, 0x64, 0x6e,
    0x9b, 0xd0, 0xaf, 0x7b, 0x64, 0x2a, 0x35, 0x25, 0x10, 0x52, 0xc5, 0x9e,
    0x58, 0x11, 0x39, 0x36, 0x45, 0x51, 0xb8, 0x39, 0x93, 0xfc, 0x9d, 0x6a,
    0xbe, 0x58, 0xcb, 0xa4, 0x0f, 0x51, 0x3c, 0x38, 0x05, 0xca, 0xab, 0x43,
    0x63, 0x0e, 0xf3, 0x8b, 0x41, 0xa6, 0xf8, 0x9b, 0x53, 0x70, 0x80, 0x53,
    0x86, 0x5e, 0x8f, 0xe3, 0xc3, 0x0d, 0x18, 0xc8, 0x4b, 0x34, 0x1f, 0xd8,
    0x1d, 0xbc, 0xf2, 0x6d, 0x34, 0x3a, 0xbe, 0xdf, 0xd9, 0xf6, 0xf3, 0x89,
    0xa1, 0xe1, 0x94, 0x9f, 0x5d, 0x4c, 0x5d, 0xe9, 0xa1, 0x49, 0x92, 0xef,
    0x0e, 0x53, 0x81, 0x89, 0x58, 0x87, 0xa6, 0x37, 0xf1, 0xdd, 0x62, 0x60,
    0x63, 0x5a, 0x9d, 0x1b, 0x8c, 0xc6, 0x7d, 0x52, 0xea, 0x70, 0x09, 0x6a,
    0xe1, 0x32, 0xf3, 0x73, 0x21, 0x1f, 0x07, 0x7b, 0x7c, 0x9b, 0x49, 0xd8,
    0xc0, 0xf3, 0x25, 0x72, 0x6f, 0x9d, 0xed, 0x31, 0x67, 0x36, 0x36, 0x54,
    0x40, 0x92, 0x71, 0xe6, 0x11, 0x28, 0x11, 0xad, 0x93, 0x32, 0x85, 0x7b,
    0x3e, 0xb7, 0x3b, 0x49, 0x13, 0x1c, 0x07, 0xb0, 0x2e, 0x93, 0xaa, 0xfd,
    0xfd, 0x28, 0x47, 0x3d, 0x8d, 0xd2, 0xda, 0xc7, 0x44, 0xd6, 0x7a, 0xdb,
    0x26, 0x7d, 0x1d, 0xb8, 0xe1, 0xde, 0x9d, 0x7a, 0x7d, 0x17, 0x7e, 0x1c,
    0x37, 0x04, 0x8d, 0x2d, 0x7c, 0x5e, 0x18, 0x38, 0x1e, 0xaf, 0xc7, 0x1b,
    0x33, 0x48, 0x31, 0x00, 0x59, 0xf6, 0xf2, 0xca, 0x0f, 0x27, 0x1b, 0x63,
    0x12, 0x7e, 0x02, 0x1d, 0x49, 0xc0, 0x5d, 0x79, 0x87, 0xef, 0x5e, 0x7a,
    0x2f, 0x1f, 0x66, 0x55, 0xd8, 0x09, 0xd9, 0x61, 0x38, 0x68, 0xb0, 0x07,
    0xa3, 0xfc, 0xcc, 0x85, 0x10, 0x7f, 0x4c, 0x65, 0x65, 0xb3, 0xfa, 0xfa,
    0xa5, 0x53, 0x6f, 0xdb, 0x74, 0x4c, 0x56, 0x46, 0x03, 0xe2, 0xd5, 0x7a,
    0x29, 0x1c, 0xc6, 0x02, 0xbc, 0x59, 0xf2, 0x04, 0x75, 0x63, 0xc0, 0x84,
    0x2f, 0x60, 0x1c, 0x67, 0x76, 0xfd, 0x63, 0x86, 0xf3, 0xfa, 0xbf, 0xdc,
    0xd2, 0x2d, 0x90, 0x91, 0xbd, 0x33, 0xa9, 0xe5, 0x66, 0x0c, 0xda, 0x42,
    0x27, 0xca, 0xf4, 0x66, 0xc2, 0xec, 0x92, 0x14, 0x57, 0x06, 0x63, 0xd0,
    0x4d, 0x15, 0x06, 0xeb, 0x69, 0x58, 0x4f, 0x77, 0xc5, 0x8b, 0xc7, 0xf0,
    0x8e, 0xed, 0x64, 0xa0, 0xb3, 0x3c, 0x66, 0x71, 0xc6, 0x2d, 0xda, 0x0a,
    0x0d, 0xfe, 0x70, 0x27, 0x64, 0xf8, 0x27, 0xfa, 0xf6, 0x5f, 0x30, 0xa5,
    0x0d, 0x6c, 0xda, 0xf2, 0x62, 0x5e, 0x78, 0x47, 0xd3, 0x66, 0x00, 0x1c,
    0xfd, 0x56, 0x1f, 0x5d, 0x3f, 0x6f, 0xf4, 0x4c, 0xd8, 0xfd, 0x0e, 0x27,
    0xc9, 0x5c, 0x2b, 0xbc, 0xc0, 0xa4, 0xe7, 0x23, 0x29, 0x02, 0x9f, 0x31,
    0xd6, 0xe9, 0xd7, 0x96, 0xf4, 0xe0, 0x5e, 0x0b, 0x0e, 0x13, 0xee, 0x3c,
    0x09, 0xed, 0xf2, 0x3d, 0x76, 0x91, 0xc3, 0xa4, 0x97, 0xae, 0xd4, 0x87,
    0xd0, 0x5d, 0xf6, 0x18, 0x47, 0x1f, 0x1d, 0x67, 0xf2, 0xcf, 0x63, 0xa0,
    0x91, 0x27, 0xf8, 0x93, 0x45, 0x75, 0x23, 0x3f, 0xd1, 0xf1, 0xad, 0x23,
    0xdd, 0x64, 0x93, 0x96, 0x41, 0x70, 0x7f, 0xf7, 0xf5, 0xa9, 0x89, 0xa2,
    0x34, 0xb0, 0x8d, 0x1b, 0xae, 0x19, 0x15, 0x49, 0x58, 0x23, 0x6d, 0x87,
    0x15, 0x4f, 0x81, 0x76, 0xfb, 0x23, 0xb5, 0xea, 0xcf, 0xac, 0x54, 0x8d,
    0x4e, 0x42, 0x2f, 0xeb, 0x0f, 0x63, 0xdb, 0x68, 0x37, 0xa8, 0xcf, 0x8b,
    0xab, 0xf5, 0xa4, 0x6e, 0x96, 0x2a, 0xb2, 0xd6, 0xbe, 0x9e, 0xbd, 0x0d,
    0xb4, 0x42, 0xa9, 0xcf, 0x01, 0x83, 0x8a, 0x17, 0x47, 0x76, 0xc4, 0xc6,
    0x83, 0x04, 0x95, 0x0b, 0xfc, 0x11, 0xc9, 0x62, 0xb8, 0x0c, 0x76, 0x84,
    0xd9, 0xb9, 0x37, 0xfa, 0xfc, 0x7c, 0xc2, 0x6d, 0x58, 0x3e, 0xb3, 0x04,
    0xbb, 0x8c, 0x8f, 0x48, 0xbc, 0x91, 0x27, 0xcc, 0xf9, 0xb7, 0x22, 0x19,
    0x83, 0x2e, 0x09, 0xb5, 0x72, 0xd9, 0x54, 0x1c, 0x4d, 0xa1, 0xea, 0x0b,
    0xf1, 0xc6, 0x08, 0x72, 0x46, 0x87, 0x7a, 0x6e, 0x80, 0x56, 0x0a, 0x8a,
    0xc0, 0xdd, 0x11, 0x6b, 0xd6, 0xdd, 0x47, 0xdf, 0x10, 0xd9, 0xd8, 0xea,
    0x7c, 0xb0, 0x8f, 0x03, 0x00, 0x2e, 0xc1, 0x8f, 0x44, 0xa8, 0xd3, 0x30,
    0x06, 0x89, 0xa2, 0xf9, 0x34, 0xad, 0xdc, 0x03, 0x85, 0xed, 0x51, 0xa7,
    0x82, 0x9c, 0xe7, 0x5d, 0x52, 0x93, 0x0c, 0x32, 0x9a, 0x5b, 0xe1, 0xaa,
    0xca, 0xb8, 0x02, 0x6d, 0x3a, 0xd4, 0xb1, 0x3a, 0xf0, 0x5f, 0xbe, 0xb5,
    0x0d, 0x10, 0x6b, 0x38, 0x32, 0xac, 0x76, 0x80, 0xbd, 0xca, 0x94, 0x71,
    0x7a, 0xf2, 0xc9, 0x35, 0x2a, 0xde, 0x9f, 0x42, 0x49, 0x18, 0x01, 0xab,
    0xbc, 0xef, 0x7c, 0x64, 0x3f, 0x58, 0x3d, 0x92, 0x59, 0xdb, 0x13, 0xdb,
    0x58, 0x6e, 0x0a, 0xe0, 0xb7, 0x91, 0x4a, 0x08, 0x20, 0xd6, 0x2e, 0x3c,
    0x45, 0xc9, 0x8b, 0x17, 0x79, 0xe7, 0xc7, 0x90, 0x99, 0x3a, 0x18, 0x25,
};

static void ge_scalarmult_base(ge_p3 *h, const uint8_t a[32]) {
  /* kSmallPrecomp is first expanded into matching |ge_precomp| elements. */
  ge_precomp multiples[15];

  unsigned i;
  for (i = 0; i < 15; i++) {
    const uint8_t *bytes = &kSmallPrecomp[i*(2 * 32)];
    fe x, y;
    fe_frombytes(x, bytes);
    fe_frombytes(y, bytes + 32);

    ge_precomp *out = &multiples[i];
    fe_add(out->yplusx, y, x);
    fe_sub(out->yminusx, y, x);
    fe_mul(out->xy2d, x, y);
    fe_mul(out->xy2d, out->xy2d, d2);
  }

  /* See the comment above |kSmallPrecomp| about the structure of the
   * precomputed elements. This loop does 64 additions and 64 doublings to
   * calculate the result. */
  ge_p3_0(h);

  for (i = 63; i < 64; i--) {
    unsigned j;
    signed char index = 0;

    for (j = 0; j < 4; j++) {
      const uint8_t bit = 1 & (a[(8 * j) + (i / 8)] >> (i & 7));
      index |= (bit << j);
    }

    ge_precomp e;
    ge_precomp_0(&e);

    for (j = 1; j < 16; j++) {
      cmov(&e, &multiples[j-1], equal(index, j));
    }

    ge_cached cached;
    ge_p1p1 r;
    ge_p3_to_cached(&cached, h);
    ge_add(&r, h, &cached);
    ge_p1p1_to_p3(h, &r);

    ge_madd(&r, h, &e);
    ge_p1p1_to_p3(h, &r);
  }
}

#else

/* base[i][j] = (j+1)*256^i*B */
static ge_precomp base[32][8] = {
    {
        {
            {25967493, -14356035, 29566456, 3660896, -12694345, 4014787,
             27544626, -11754271, -6079156, 2047605},
            {-12545711, 934262, -2722910, 3049990, -727428, 9406986, 12720692,
             5043384, 19500929, -15469378},
            {-8738181, 4489570, 9688441, -14785194, 10184609, -12363380,
             29287919, 11864899, -24514362, -4438546},
        },
        {
            {-12815894, -12976347, -21581243, 11784320, -25355658, -2750717,
             -11717903, -3814571, -358445, -10211303},
            {-21703237, 6903825, 27185491, 6451973, -29577724, -9554005,
             -15616551, 11189268, -26829678, -5319081},
            {26966642, 11152617, 32442495, 15396054, 14353839, -12752335,
             -3128826, -9541118, -15472047, -4166697},
        },
        {
            {15636291, -9688557, 24204773, -7912398, 616977, -16685262,
             27787600, -14772189, 28944400, -1550024},
            {16568933, 4717097, -11556148, -1102322, 15682896, -11807043,
             16354577, -11775962, 7689662, 11199574},
            {30464156, -5976125, -11779434, -15670865, 23220365, 15915852,
             7512774, 10017326, -17749093, -9920357},
        },
        {
            {-17036878, 13921892, 10945806, -6033431, 27105052, -16084379,
             -28926210, 15006023, 3284568, -6276540},
            {23599295, -8306047, -11193664, -7687416, 13236774, 10506355,
             7464579, 9656445, 13059162, 10374397},
            {7798556, 16710257, 3033922, 2874086, 28997861, 2835604, 32406664,
             -3839045, -641708, -101325},
        },
        {
            {10861363, 11473154, 27284546, 1981175, -30064349, 12577861,
             32867885, 14515107, -15438304, 10819380},
            {4708026, 6336745, 20377586, 9066809, -11272109, 6594696, -25653668,
             12483688, -12668491, 5581306},
            {19563160, 16186464, -29386857, 4097519, 10237984, -4348115,
             28542350, 13850243, -23678021, -15815942},
        },
        {
            {-15371964, -12862754, 32573250, 4720197, -26436522, 5875511,
             -19188627, -15224819, -9818940, -12085777},
            {-8549212, 109983, 15149363, 2178705, 22900618, 4543417, 3044240,
             -15689887, 1762328, 14866737},
            {-18199695, -15951423, -10473290, 1707278, -17185920, 3916101,
             -28236412, 3959421, 27914454, 4383652},
        },
        {
            {5153746, 9909285, 1723747, -2777874, 30523605, 5516873, 19480852,
             5230134, -23952439, -15175766},
            {-30269007, -3463509, 7665486, 10083793, 28475525, 1649722,
             20654025, 16520125, 30598449, 7715701},
            {28881845, 14381568, 9657904, 3680757, -20181635, 7843316,
             -31400660, 1370708, 29794553, -1409300},
        },
        {
            {14499471, -2729599, -33191113, -4254652, 28494862, 14271267,
             30290735, 10876454, -33154098, 2381726},
            {-7195431, -2655363, -14730155, 462251, -27724326, 3941372,
             -6236617, 3696005, -32300832, 15351955},
            {27431194, 8222322, 16448760, -3907995, -18707002, 11938355,
             -32961401, -2970515, 29551813, 10109425},
        },
    },
    {
        {
            {-13657040, -13155431, -31283750, 11777098, 21447386, 6519384,
             -2378284, -1627556, 10092783, -4764171},
            {27939166, 14210322, 4677035, 16277044, -22964462, -12398139,
             -32508754, 12005538, -17810127, 12803510},
            {17228999, -15661624, -1233527, 300140, -1224870, -11714777,
             30364213, -9038194, 18016357, 4397660},
        },
        {
            {-10958843, -7690207, 4776341, -14954238, 27850028, -15602212,
             -26619106, 14544525, -17477504, 982639},
            {29253598, 15796703, -2863982, -9908884, 10057023, 3163536, 7332899,
             -4120128, -21047696, 9934963},
            {5793303, 16271923, -24131614, -10116404, 29188560, 1206517,
             -14747930, 4559895, -30123922, -10897950},
        },
        {
            {-27643952, -11493006, 16282657, -11036493, 28414021, -15012264,
             24191034, 4541697, -13338309, 5500568},
            {12650548, -1497113, 9052871, 11355358, -17680037, -8400164,
             -17430592, 12264343, 10874051, 13524335},
            {25556948, -3045990, 714651, 2510400, 23394682, -10415330, 33119038,
             5080568, -22528059, 5376628},
        },
        {
            {-26088264, -4011052, -17013699, -3537628, -6726793, 1920897,
             -22321305, -9447443, 4535768, 1569007},
            {-2255422, 14606630, -21692440, -8039818, 28430649, 8775819,
             -30494562, 3044290, 31848280, 12543772},
            {-22028579, 2943893, -31857513, 6777306, 13784462, -4292203,
             -27377195, -2062731, 7718482, 14474653},
        },
        {
            {2385315, 2454213, -22631320, 46603, -4437935, -15680415, 656965,
             -7236665, 24316168, -5253567},
            {13741529, 10911568, -33233417, -8603737, -20177830, -1033297,
             33040651, -13424532, -20729456, 8321686},
            {21060490, -2212744, 15712757, -4336099, 1639040, 10656336,
             23845965, -11874838, -9984458, 608372},
        },
        {
            {-13672732, -15087586, -10889693, -7557059, -6036909, 11305547,
             1123968, -6780577, 27229399, 23887},
            {-23244140, -294205, -11744728, 14712571, -29465699, -2029617,
             12797024, -6440308, -1633405, 16678954},
            {-29500620, 4770662, -16054387, 14001338, 7830047, 9564805,
             -1508144, -4795045, -17169265, 4904953},
        },
        {
            {24059557, 14617003, 19037157, -15039908, 19766093, -14906429,
             5169211, 16191880, 2128236, -4326833},
            {-16981152, 4124966, -8540610, -10653797, 30336522, -14105247,
             -29806336, 916033, -6882542, -2986532},
            {-22630907, 12419372, -7134229, -7473371, -16478904, 16739175,
             285431, 2763829, 15736322, 4143876},
        },
        {
            {2379352, 11839345, -4110402, -5988665, 11274298, 794957, 212801,
             -14594663, 23527084, -16458268},
            {33431127, -11130478, -17838966, -15626900, 8909499, 8376530,
             -32625340, 4087881, -15188911, -14416214},
            {1767683, 7197987, -13205226, -2022635, -13091350, 448826, 5799055,
             4357868, -4774191, -16323038},
        },
    },
    {
        {
            {6721966, 13833823, -23523388, -1551314, 26354293, -11863321,
             23365147, -3949732, 7390890, 2759800},
            {4409041, 2052381, 23373853, 10530217, 7676779, -12885954, 21302353,
             -4264057, 1244380, -12919645},
            {-4421239, 7169619, 4982368, -2957590, 30256825, -2777540, 14086413,
             9208236, 15886429, 16489664},
        },
        {
            {1996075, 10375649, 14346367, 13311202, -6874135, -16438411,
             -13693198, 398369, -30606455, -712933},
            {-25307465, 9795880, -2777414, 14878809, -33531835, 14780363,
             13348553, 12076947, -30836462, 5113182},
            {-17770784, 11797796, 31950843, 13929123, -25888302, 12288344,
             -30341101, -7336386, 13847711, 5387222},
        },
        {
            {-18582163, -3416217, 17824843, -2340966, 22744343, -10442611,
             8763061, 3617786, -19600662, 10370991},
            {20246567, -14369378, 22358229, -543712, 18507283, -10413996,
             14554437, -8746092, 32232924, 16763880},
            {9648505, 10094563, 26416693, 14745928, -30374318, -6472621,
             11094161, 15689506, 3140038, -16510092},
        },
        {
            {-16160072, 5472695, 31895588, 4744994, 8823515, 10365685,
             -27224800, 9448613, -28774454, 366295},
            {19153450, 11523972, -11096490, -6503142, -24647631, 5420647,
             28344573, 8041113, 719605, 11671788},
            {8678025, 2694440, -6808014, 2517372, 4964326, 11152271, -15432916,
             -15266516, 27000813, -10195553},
        },
        {
            {-15157904, 7134312, 8639287, -2814877, -7235688, 10421742, 564065,
             5336097, 6750977, -14521026},
            {11836410, -3979488, 26297894, 16080799, 23455045, 15735944,
             1695823, -8819122, 8169720, 16220347},
            {-18115838, 8653647, 17578566, -6092619, -8025777, -16012763,
             -11144307, -2627664, -5990708, -14166033},
        },
        {
            {-23308498, -10968312, 15213228, -10081214, -30853605, -11050004,
             27884329, 2847284, 2655861, 1738395},
            {-27537433, -14253021, -25336301, -8002780, -9370762, 8129821,
             21651608, -3239336, -19087449, -11005278},
            {1533110, 3437855, 23735889, 459276, 29970501, 11335377, 26030092,
             5821408, 10478196, 8544890},
        },
        {
            {32173121, -16129311, 24896207, 3921497, 22579056, -3410854,
             19270449, 12217473, 17789017, -3395995},
            {-30552961, -2228401, -15578829, -10147201, 13243889, 517024,
             15479401, -3853233, 30460520, 1052596},
            {-11614875, 13323618, 32618793, 8175907, -15230173, 12596687,
             27491595, -4612359, 3179268, -9478891},
        },
        {
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        },
        {
            {-16358878, -12663911, -12065183, 4996454, -1256422, 1073572,
             9583558, 12851107, 4003896, 12673717},
            {-1731589, -15155870, -3262930, 16143082, 19294135, 13385325,
             14741514, -9103726, 7903886, 2348101},
            {24536016, -16515207, 12715592, -3862155, 1511293, 10047386,
             -3842346, -7129159, -28377538, 10048127},
        },
    },
    {
        {
            {-12622226, -6204820, 30718825, 2591312, -10617028, 12192840,
             18873298, -7297090, -32297756, 15221632},
            {-26478122, -11103864, 11546244, -1852483, 9180880, 7656409,
             -21343950, 2095755, 29769758, 6593415},
            {-31994208, -2907461, 4176912, 3264766, 12538965, -868111, 26312345,
             -6118678, 30958054, 8292160},
        },
        {
            {31429822, -13959116, 29173532, 15632448, 12174511, -2760094,
             32808831, 3977186, 26143136, -3148876},
            {22648901, 1402143, -22799984, 13746059, 7936347, 365344, -8668633,
             -1674433, -3758243, -2304625},
            {-15491917, 8012313, -2514730, -12702462, -23965846, -10254029,
             -1612713, -1535569, -16664475, 8194478},
        },
        {
            {27338066, -7507420, -7414224, 10140405, -19026427, -6589889,
             27277191, 8855376, 28572286, 3005164},
            {26287124, 4821776, 25476601, -4145903, -3764513, -15788984,
             -18008582, 1182479, -26094821, -13079595},
            {-7171154, 3178080, 23970071, 6201893, -17195577, -4489192,
             -21876275, -13982627, 32208683, -1198248},
        },
        {
            {-16657702, 2817643, -10286362, 14811298, 6024667, 13349505,
             -27315504, -10497842, -27672585, -11539858},
            {15941029, -9405932, -21367050, 8062055, 31876073, -238629,
             -15278393, -1444429, 15397331, -4130193},
            {8934485, -13485467, -23286397, -13423241, -32446090, 14047986,
             31170398, -1441021, -27505566, 15087184},
        },
        {
            {-18357243, -2156491, 24524913, -16677868, 15520427, -6360776,
             -15502406, 11461896, 16788528, -5868942},
            {-1947386, 16013773, 21750665, 3714552, -17401782, -16055433,
             -3770287, -10323320, 31322514, -11615635},
            {21426655, -5650218, -13648287, -5347537, -28812189, -4920970,
             -18275391, -14621414, 13040862, -12112948},
        },
        {
            {11293895, 12478086, -27136401, 15083750, -29307421, 14748872,
             14555558, -13417103, 1613711, 4896935},
            {-25894883, 15323294, -8489791, -8057900, 25967126, -13425460,
             2825960, -4897045, -23971776, -11267415},
            {-15924766, -5229880, -17443532, 6410664, 3622847, 10243618,
             20615400, 12405433, -23753030, -8436416},
        },
        {
            {-7091295, 12556208, -20191352, 9025187, -17072479, 4333801,
             4378436, 2432030, 23097949, -566018},
            {4565804, -16025654, 20084412, -7842817, 1724999, 189254, 24767264,
             10103221, -18512313, 2424778},
            {366633, -11976806, 8173090, -6890119, 30788634, 5745705, -7168678,
             1344109, -3642553, 12412659},
        },
        {
            {-24001791, 7690286, 14929416, -168257, -32210835, -13412986,
             24162697, -15326504, -3141501, 11179385},
            {18289522, -14724954, 8056945, 16430056, -21729724, 7842514,
             -6001441, -1486897, -18684645, -11443503},
            {476239, 6601091, -6152790, -9723375, 17503545, -4863900, 27672959,
             13403813, 11052904, 5219329},
        },
    },
    {
        {
            {20678546, -8375738, -32671898, 8849123, -5009758, 14574752,
             31186971, -3973730, 9014762, -8579056},
            {-13644050, -10350239, -15962508, 5075808, -1514661, -11534600,
             -33102500, 9160280, 8473550, -3256838},
            {24900749, 14435722, 17209120, -15292541, -22592275, 9878983,
             -7689309, -16335821, -24568481, 11788948},
        },
        {
            {-3118155, -11395194, -13802089, 14797441, 9652448, -6845904,
             -20037437, 10410733, -24568470, -1458691},
            {-15659161, 16736706, -22467150, 10215878, -9097177, 7563911,
             11871841, -12505194, -18513325, 8464118},
            {-23400612, 8348507, -14585951, -861714, -3950205, -6373419,
             14325289, 8628612, 33313881, -8370517},
        },
        {
            {-20186973, -4967935, 22367356, 5271547, -1097117, -4788838,
             -24805667, -10236854, -8940735, -5818269},
            {-6948785, -1795212, -32625683, -16021179, 32635414, -7374245,
             15989197, -12838188, 28358192, -4253904},
            {-23561781, -2799059, -32351682, -1661963, -9147719, 10429267,
             -16637684, 4072016, -5351664, 5596589},
        },
        {
            {-28236598, -3390048, 12312896, 6213178, 3117142, 16078565,
             29266239, 2557221, 1768301, 15373193},
            {-7243358, -3246960, -4593467, -7553353, -127927, -912245, -1090902,
             -4504991, -24660491, 3442910},
            {-30210571, 5124043, 14181784, 8197961, 18964734, -11939093,
             22597931, 7176455, -18585478, 13365930},
        },
        {
            {-7877390, -1499958, 8324673, 4690079, 6261860, 890446, 24538107,
             -8570186, -9689599, -3031667},
            {25008904, -10771599, -4305031, -9638010, 16265036, 15721635,
             683793, -11823784, 15723479, -15163481},
            {-9660625, 12374379, -27006999, -7026148, -7724114, -12314514,
             11879682, 5400171, 519526, -1235876},
        },
        {
            {22258397, -16332233, -7869817, 14613016, -22520255, -2950923,
             -20353881, 7315967, 16648397, 7605640},
            {-8081308, -8464597, -8223311, 9719710, 19259459, -15348212,
             23994942, -5281555, -9468848, 4763278},
            {-21699244, 9220969, -15730624, 1084137, -25476107, -2852390,
             31088447, -7764523, -11356529, 728112},
        },
        {
            {26047220, -11751471, -6900323, -16521798, 24092068, 9158119,
             -4273545, -12555558, -29365436, -5498272},
            {17510331, -322857, 5854289, 8403524, 17133918, -3112612, -28111007,
             12327945, 10750447, 10014012},
            {-10312768, 3936952, 9156313, -8897683, 16498692, -994647,
             -27481051, -666732, 3424691, 7540221},
        },
        {
            {30322361, -6964110, 11361005, -4143317, 7433304, 4989748, -7071422,
             -16317219, -9244265, 15258046},
            {13054562, -2779497, 19155474, 469045, -12482797, 4566042, 5631406,
             2711395, 1062915, -5136345},
            {-19240248, -11254599, -29509029, -7499965, -5835763, 13005411,
             -6066489, 12194497, 32960380, 1459310},
        },
    },
    {
        {
            {19852034, 7027924, 23669353, 10020366, 8586503, -6657907, 394197,
             -6101885, 18638003, -11174937},
            {31395534, 15098109, 26581030, 8030562, -16527914, -5007134,
             9012486, -7584354, -6643087, -5442636},
            {-9192165, -2347377, -1997099, 4529534, 25766844, 607986, -13222,
             9677543, -32294889, -6456008},
        },
        {
            {-2444496, -149937, 29348902, 8186665, 1873760, 12489863, -30934579,
             -7839692, -7852844, -8138429},
            {-15236356, -15433509, 7766470, 746860, 26346930, -10221762,
             -27333451, 10754588, -9431476, 5203576},
            {31834314, 14135496, -770007, 5159118, 20917671, -16768096,
             -7467973, -7337524, 31809243, 7347066},
        },
        {
            {-9606723, -11874240, 20414459, 13033986, 13716524, -11691881,
             19797970, -12211255, 15192876, -2087490},
            {-12663563, -2181719, 1168162, -3804809, 26747877, -14138091,
             10609330, 12694420, 33473243, -13382104},
            {33184999, 11180355, 15832085, -11385430, -1633671, 225884,
             15089336, -11023903, -6135662, 14480053},
        },
        {
            {31308717, -5619998, 31030840, -1897099, 15674547, -6582883,
             5496208, 13685227, 27595050, 8737275},
            {-20318852, -15150239, 10933843, -16178022, 8335352, -7546022,
             -31008351, -12610604, 26498114, 66511},
            {22644454, -8761729, -16671776, 4884562, -3105614, -13559366,
             30540766, -4286747, -13327787, -7515095},
        },
        {
            {-28017847, 9834845, 18617207, -2681312, -3401956, -13307506,
             8205540, 13585437, -17127465, 15115439},
            {23711543, -672915, 31206561, -8362711, 6164647, -9709987,
             -33535882, -1426096, 8236921, 16492939},
            {-23910559, -13515526, -26299483, -4503841, 25005590, -7687270,
             19574902, 10071562, 6708380, -6222424},
        },
        {
            {2101391, -4930054, 19702731, 2367575, -15427167, 1047675, 5301017,
             9328700, 29955601, -11678310},
            {3096359, 9271816, -21620864, -15521844, -14847996, -7592937,
             -25892142, -12635595, -9917575, 6216608},
            {-32615849, 338663, -25195611, 2510422, -29213566, -13820213,
             24822830, -6146567, -26767480, 7525079},
        },
        {
            {-23066649, -13985623, 16133487, -7896178, -3389565, 778788,
             -910336, -2782495, -19386633, 11994101},
            {21691500, -13624626, -641331, -14367021, 3285881, -3483596,
             -25064666, 9718258, -7477437, 13381418},
            {18445390, -4202236, 14979846, 11622458, -1727110, -3582980,
             23111648, -6375247, 28535282, 15779576},
        },
        {
            {30098053, 3089662, -9234387, 16662135, -21306940, 11308411,
             -14068454, 12021730, 9955285, -16303356},
            {9734894, -14576830, -7473633, -9138735, 2060392, 11313496,
             -18426029, 9924399, 20194861, 13380996},
            {-26378102, -7965207, -22167821, 15789297, -18055342, -6168792,
             -1984914, 15707771, 26342023, 10146099},
        },
    },
    {
        {
            {-26016874, -219943, 21339191, -41388, 19745256, -2878700,
             -29637280, 2227040, 21612326, -545728},
            {-13077387, 1184228, 23562814, -5970442, -20351244, -6348714,
             25764461, 12243797, -20856566, 11649658},
            {-10031494, 11262626, 27384172, 2271902, 26947504, -15997771, 39944,
             6114064, 33514190, 2333242},
        },
        {
            {-21433588, -12421821, 8119782, 7219913, -21830522, -9016134,
             -6679750, -12670638, 24350578, -13450001},
            {-4116307, -11271533, -23886186, 4843615, -30088339, 690623,
             -31536088, -10406836, 8317860, 12352766},
            {18200138, -14475911, -33087759, -2696619, -23702521, -9102511,
             -23552096, -2287550, 20712163, 6719373},
        },
        {
            {26656208, 6075253, -7858556, 1886072, -28344043, 4262326, 11117530,
             -3763210, 26224235, -3297458},
            {-17168938, -14854097, -3395676, -16369877, -19954045, 14050420,
             21728352, 9493610, 18620611, -16428628},
            {-13323321, 13325349, 11432106, 5964811, 18609221, 6062965,
             -5269471, -9725556, -30701573, -16479657},
        },
        {
            {-23860538, -11233159, 26961357, 1640861, -32413112, -16737940,
             12248509, -5240639, 13735342, 1934062},
            {25089769, 6742589, 17081145, -13406266, 21909293, -16067981,
             -15136294, -3765346, -21277997, 5473616},
            {31883677, -7961101, 1083432, -11572403, 22828471, 13290673,
             -7125085, 12469656, 29111212, -5451014},
        },
        {
            {24244947, -15050407, -26262976, 2791540, -14997599, 16666678,
             24367466, 6388839, -10295587, 452383},
            {-25640782, -3417841, 5217916, 16224624, 19987036, -4082269,
             -24236251, -5915248, 15766062, 8407814},
            {-20406999, 13990231, 15495425, 16395525, 5377168, 15166495,
             -8917023, -4388953, -8067909, 2276718},
        },
        {
            {30157918, 12924066, -17712050, 9245753, 19895028, 3368142,
             -23827587, 5096219, 22740376, -7303417},
            {2041139, -14256350, 7783687, 13876377, -25946985, -13352459,
             24051124, 13742383, -15637599, 13295222},
            {33338237, -8505733, 12532113, 7977527, 9106186, -1715251,
             -17720195, -4612972, -4451357, -14669444},
        },
        {
            {-20045281, 5454097, -14346548, 6447146, 28862071, 1883651,
             -2469266, -4141880, 7770569, 9620597},
            {23208068, 7979712, 33071466, 8149229, 1758231, -10834995, 30945528,
             -1694323, -33502340, -14767970},
            {1439958, -16270480, -1079989, -793782, 4625402, 10647766, -5043801,
             1220118, 30494170, -11440799},
        },
        {
            {-5037580, -13028295, -2970559, -3061767, 15640974, -6701666,
             -26739026, 926050, -1684339, -13333647},
            {13908495, -3549272, 30919928, -6273825, -21521863, 7989039,
             9021034, 9078865, 3353509, 4033511},
            {-29663431, -15113610, 32259991, -344482, 24295849, -12912123,
             23161163, 8839127, 27485041, 7356032},
        },
    },
    {
        {
            {9661027, 705443, 11980065, -5370154, -1628543, 14661173, -6346142,
             2625015, 28431036, -16771834},
            {-23839233, -8311415, -25945511, 7480958, -17681669, -8354183,
             -22545972, 14150565, 15970762, 4099461},
            {29262576, 16756590, 26350592, -8793563, 8529671, -11208050,
             13617293, -9937143, 11465739, 8317062},
        },
        {
            {-25493081, -6962928, 32500200, -9419051, -23038724, -2302222,
             14898637, 3848455, 20969334, -5157516},
            {-20384450, -14347713, -18336405, 13884722, -33039454, 2842114,
             -21610826, -3649888, 11177095, 14989547},
            {-24496721, -11716016, 16959896, 2278463, 12066309, 10137771,
             13515641, 2581286, -28487508, 9930240},
        },
        {
            {-17751622, -2097826, 16544300, -13009300, -15914807, -14949081,
             18345767, -13403753, 16291481, -5314038},
            {-33229194, 2553288, 32678213, 9875984, 8534129, 6889387, -9676774,
             6957617, 4368891, 9788741},
            {16660756, 7281060, -10830758, 12911820, 20108584, -8101676,
             -21722536, -8613148, 16250552, -11111103},
        },
        {
            {-19765507, 2390526, -16551031, 14161980, 1905286, 6414907, 4689584,
             10604807, -30190403, 4782747},
            {-1354539, 14736941, -7367442, -13292886, 7710542, -14155590,
             -9981571, 4383045, 22546403, 437323},
            {31665577, -12180464, -16186830, 1491339, -18368625, 3294682,
             27343084, 2786261, -30633590, -14097016},
        },
        {
            {-14467279, -683715, -33374107, 7448552, 19294360, 14334329,
             -19690631, 2355319, -19284671, -6114373},
            {15121312, -15796162, 6377020, -6031361, -10798111, -12957845,
             18952177, 15496498, -29380133, 11754228},
            {-2637277, -13483075, 8488727, -14303896, 12728761, -1622493,
             7141596, 11724556, 22761615, -10134141},
        },
        {
            {16918416, 11729663, -18083579, 3022987, -31015732, -13339659,
             -28741185, -12227393, 32851222, 11717399},
            {11166634, 7338049, -6722523, 4531520, -29468672, -7302055,
             31474879, 3483633, -1193175, -4030831},
            {-185635, 9921305, 31456609, -13536438, -12013818, 13348923,
             33142652, 6546660, -19985279, -3948376},
        },
        {
            {-32460596, 11266712, -11197107, -7899103, 31703694, 3855903,
             -8537131, -12833048, -30772034, -15486313},
            {-18006477, 12709068, 3991746, -6479188, -21491523, -10550425,
             -31135347, -16049879, 10928917, 3011958},
            {-6957757, -15594337, 31696059, 334240, 29576716, 14796075,
             -30831056, -12805180, 18008031, 10258577},
        },
        {
            {-22448644, 15655569, 7018479, -4410003, -30314266, -1201591,
             -1853465, 1367120, 25127874, 6671743},
            {29701166, -14373934, -10878120, 9279288, -17568, 13127210,
             21382910, 11042292, 25838796, 4642684},
            {-20430234, 14955537, -24126347, 8124619, -5369288, -5990470,
             30468147, -13900640, 18423289, 4177476},
        },
    },
};

static uint8_t negative(signed char b) {
  uint32_t x = b;
  x >>= 31; /* 1: yes; 0: no */
  return x;
}

static void table_select(ge_precomp *t, int pos, signed char b) {
  ge_precomp minust;
  uint8_t bnegative = negative(b);
  uint8_t babs = b - (((-bnegative) & b) << 1);

  ge_precomp_0(t);
  cmov(t, &base[pos][0], equal(babs, 1));
  cmov(t, &base[pos][1], equal(babs, 2));
  cmov(t, &base[pos][2], equal(babs, 3));
  cmov(t, &base[pos][3], equal(babs, 4));
  cmov(t, &base[pos][4], equal(babs, 5));
  cmov(t, &base[pos][5], equal(babs, 6));
  cmov(t, &base[pos][6], equal(babs, 7));
  cmov(t, &base[pos][7], equal(babs, 8));
  fe_copy(minust.yplusx, t->yminusx);
  fe_copy(minust.yminusx, t->yplusx);
  fe_neg(minust.xy2d, t->xy2d);
  cmov(t, &minust, bnegative);
}

/* h = a * B
 * where a = a[0]+256*a[1]+...+256^31 a[31]
 * B is the Ed25519 base point (x,4/5) with x positive.
 *
 * Preconditions:
 *   a[31] <= 127 */
static void ge_scalarmult_base(ge_p3 *h, const uint8_t *a) {
  signed char e[64];
  signed char carry;
  ge_p1p1 r;
  ge_p2 s;
  ge_precomp t;
  int i;

  for (i = 0; i < 32; ++i) {
    e[2 * i + 0] = (a[i] >> 0) & 15;
    e[2 * i + 1] = (a[i] >> 4) & 15;
  }
  /* each e[i] is between 0 and 15 */
  /* e[63] is between 0 and 7 */

  carry = 0;
  for (i = 0; i < 63; ++i) {
    e[i] += carry;
    carry = e[i] + 8;
    carry >>= 4;
    e[i] -= carry << 4;
  }
  e[63] += carry;
  /* each e[i] is between -8 and 8 */

  ge_p3_0(h);
  for (i = 1; i < 64; i += 2) {
    table_select(&t, i / 2, e[i]);
    ge_madd(&r, h, &t);
    ge_p1p1_to_p3(h, &r);
  }

  ge_p3_dbl(&r, h);
  ge_p1p1_to_p2(&s, &r);
  ge_p2_dbl(&r, &s);
  ge_p1p1_to_p2(&s, &r);
  ge_p2_dbl(&r, &s);
  ge_p1p1_to_p2(&s, &r);
  ge_p2_dbl(&r, &s);
  ge_p1p1_to_p3(h, &r);

  for (i = 0; i < 64; i += 2) {
    table_select(&t, i / 2, e[i]);
    ge_madd(&r, h, &t);
    ge_p1p1_to_p3(h, &r);
  }
}

#endif

static void slide(signed char *r, const uint8_t *a) {
  int i;
  int b;
  int k;

  for (i = 0; i < 256; ++i) {
    r[i] = 1 & (a[i >> 3] >> (i & 7));
  }

  for (i = 0; i < 256; ++i) {
    if (r[i]) {
      for (b = 1; b <= 6 && i + b < 256; ++b) {
        if (r[i + b]) {
          if (r[i] + (r[i + b] << b) <= 15) {
            r[i] += r[i + b] << b;
            r[i + b] = 0;
          } else if (r[i] - (r[i + b] << b) >= -15) {
            r[i] -= r[i + b] << b;
            for (k = i + b; k < 256; ++k) {
              if (!r[k]) {
                r[k] = 1;
                break;
              }
              r[k] = 0;
            }
          } else {
            break;
          }
        }
      }
    }
  }
}

static ge_precomp Bi[8] = {
    {
        {25967493, -14356035, 29566456, 3660896, -12694345, 4014787, 27544626,
         -11754271, -6079156, 2047605},
        {-12545711, 934262, -2722910, 3049990, -727428, 9406986, 12720692,
         5043384, 19500929, -15469378},
        {-8738181, 4489570, 9688441, -14785194, 10184609, -12363380, 29287919,
         11864899, -24514362, -4438546},
    },
    {
        {15636291, -9688557, 24204773, -7912398, 616977, -16685262, 27787600,
         -14772189, 28944400, -1550024},
        {16568933, 4717097, -11556148, -1102322, 15682896, -11807043, 16354577,
         -11775962, 7689662, 11199574},
        {30464156, -5976125, -11779434, -15670865, 23220365, 15915852, 7512774,
         10017326, -17749093, -9920357},
    },
    {
        {10861363, 11473154, 27284546, 1981175, -30064349, 12577861, 32867885,
         14515107, -15438304, 10819380},
        {4708026, 6336745, 20377586, 9066809, -11272109, 6594696, -25653668,
         12483688, -12668491, 5581306},
        {19563160, 16186464, -29386857, 4097519, 10237984, -4348115, 28542350,
         13850243, -23678021, -15815942},
    },
    {
        {5153746, 9909285, 1723747, -2777874, 30523605, 5516873, 19480852,
         5230134, -23952439, -15175766},
        {-30269007, -3463509, 7665486, 10083793, 28475525, 1649722, 20654025,
         16520125, 30598449, 7715701},
        {28881845, 14381568, 9657904, 3680757, -20181635, 7843316, -31400660,
         1370708, 29794553, -1409300},
    },
    {
        {-22518993, -6692182, 14201702, -8745502, -23510406, 8844726, 18474211,
         -1361450, -13062696, 13821877},
        {-6455177, -7839871, 3374702, -4740862, -27098617, -10571707, 31655028,
         -7212327, 18853322, -14220951},
        {4566830, -12963868, -28974889, -12240689, -7602672, -2830569, -8514358,
         -10431137, 2207753, -3209784},
    },
    {
        {-25154831, -4185821, 29681144, 7868801, -6854661, -9423865, -12437364,
         -663000, -31111463, -16132436},
        {25576264, -2703214, 7349804, -11814844, 16472782, 9300885, 3844789,
         15725684, 171356, 6466918},
        {23103977, 13316479, 9739013, -16149481, 817875, -15038942, 8965339,
         -14088058, -30714912, 16193877},
    },
    {
        {-33521811, 3180713, -2394130, 14003687, -16903474, -16270840, 17238398,
         4729455, -18074513, 9256800},
        {-25182317, -4174131, 32336398, 5036987, -21236817, 11360617, 22616405,
         9761698, -19827198, 630305},
        {-13720693, 2639453, -24237460, -7406481, 9494427, -5774029, -6554551,
         -15960994, -2449256, -14291300},
    },
    {
        {-3151181, -5046075, 9282714, 6866145, -31907062, -863023, -18940575,
         15033784, 25105118, -7894876},
        {-24326370, 15950226, -31801215, -14592823, -11662737, -5090925,
         1573892, -2625887, 2198790, -15804619},
        {-3099351, 10324967, -2241613, 7453183, -5446979, -2735503, -13812022,
         -16236442, -32461234, -12290683},
    },
};

/* r = a * A + b * B
 * where a = a[0]+256*a[1]+...+256^31 a[31].
 * and b = b[0]+256*b[1]+...+256^31 b[31].
 * B is the Ed25519 base point (x,4/5) with x positive. */
void ge_double_scalarmult_vartime(ge_p2 *r, const uint8_t *a,
                                  const ge_p3 *A, const uint8_t *b) {
  signed char aslide[256];
  signed char bslide[256];
  ge_cached Ai[8]; /* A,3A,5A,7A,9A,11A,13A,15A */
  ge_p1p1 t;
  ge_p3 u;
  ge_p3 A2;
  int i;

  slide(aslide, a);
  slide(bslide, b);

  ge_p3_to_cached(&Ai[0], A);
  ge_p3_dbl(&t, A);
  ge_p1p1_to_p3(&A2, &t);
  ge_add(&t, &A2, &Ai[0]);
  ge_p1p1_to_p3(&u, &t);
  ge_p3_to_cached(&Ai[1], &u);
  ge_add(&t, &A2, &Ai[1]);
  ge_p1p1_to_p3(&u, &t);
  ge_p3_to_cached(&Ai[2], &u);
  ge_add(&t, &A2, &Ai[2]);
  ge_p1p1_to_p3(&u, &t);
  ge_p3_to_cached(&Ai[3], &u);
  ge_add(&t, &A2, &Ai[3]);
  ge_p1p1_to_p3(&u, &t);
  ge_p3_to_cached(&Ai[4], &u);
  ge_add(&t, &A2, &Ai[4]);
  ge_p1p1_to_p3(&u, &t);
  ge_p3_to_cached(&Ai[5], &u);
  ge_add(&t, &A2, &Ai[5]);
  ge_p1p1_to_p3(&u, &t);
  ge_p3_to_cached(&Ai[6], &u);
  ge_add(&t, &A2, &Ai[6]);
  ge_p1p1_to_p3(&u, &t);
  ge_p3_to_cached(&Ai[7], &u);

  ge_p2_0(r);

  for (i = 255; i >= 0; --i) {
    if (aslide[i] || bslide[i]) {
      break;
    }
  }

  for (; i >= 0; --i) {
    ge_p2_dbl(&t, r);

    if (aslide[i] > 0) {
      ge_p1p1_to_p3(&u, &t);
      ge_add(&t, &u, &Ai[aslide[i] / 2]);
    } else if (aslide[i] < 0) {
      ge_p1p1_to_p3(&u, &t);
      ge_sub(&t, &u, &Ai[(-aslide[i]) / 2]);
    }

    if (bslide[i] > 0) {
      ge_p1p1_to_p3(&u, &t);
      ge_madd(&t, &u, &Bi[bslide[i] / 2]);
    } else if (bslide[i] < 0) {
      ge_p1p1_to_p3(&u, &t);
      ge_msub(&t, &u, &Bi[(-bslide[i]) / 2]);
    }

    ge_p1p1_to_p2(r, &t);
  }
}

/* The set of scalars is \Z/l
 * where l = 2^252 + 27742317777372353535851937790883648493. */

/* Input:
 *   s[0]+256*s[1]+...+256^63*s[63] = s
 *
 * Output:
 *   s[0]+256*s[1]+...+256^31*s[31] = s mod l
 *   where l = 2^252 + 27742317777372353535851937790883648493.
 *   Overwrites s in place. */
static void sc_reduce(uint8_t *s) {
  int64_t s0 = 2097151 & load_3(s);
  int64_t s1 = 2097151 & (load_4(s + 2) >> 5);
  int64_t s2 = 2097151 & (load_3(s + 5) >> 2);
  int64_t s3 = 2097151 & (load_4(s + 7) >> 7);
  int64_t s4 = 2097151 & (load_4(s + 10) >> 4);
  int64_t s5 = 2097151 & (load_3(s + 13) >> 1);
  int64_t s6 = 2097151 & (load_4(s + 15) >> 6);
  int64_t s7 = 2097151 & (load_3(s + 18) >> 3);
  int64_t s8 = 2097151 & load_3(s + 21);
  int64_t s9 = 2097151 & (load_4(s + 23) >> 5);
  int64_t s10 = 2097151 & (load_3(s + 26) >> 2);
  int64_t s11 = 2097151 & (load_4(s + 28) >> 7);
  int64_t s12 = 2097151 & (load_4(s + 31) >> 4);
  int64_t s13 = 2097151 & (load_3(s + 34) >> 1);
  int64_t s14 = 2097151 & (load_4(s + 36) >> 6);
  int64_t s15 = 2097151 & (load_3(s + 39) >> 3);
  int64_t s16 = 2097151 & load_3(s + 42);
  int64_t s17 = 2097151 & (load_4(s + 44) >> 5);
  int64_t s18 = 2097151 & (load_3(s + 47) >> 2);
  int64_t s19 = 2097151 & (load_4(s + 49) >> 7);
  int64_t s20 = 2097151 & (load_4(s + 52) >> 4);
  int64_t s21 = 2097151 & (load_3(s + 55) >> 1);
  int64_t s22 = 2097151 & (load_4(s + 57) >> 6);
  int64_t s23 = (load_4(s + 60) >> 3);
  int64_t carry0;
  int64_t carry1;
  int64_t carry2;
  int64_t carry3;
  int64_t carry4;
  int64_t carry5;
  int64_t carry6;
  int64_t carry7;
  int64_t carry8;
  int64_t carry9;
  int64_t carry10;
  int64_t carry11;
  int64_t carry12;
  int64_t carry13;
  int64_t carry14;
  int64_t carry15;
  int64_t carry16;

  s11 += s23 * 666643;
  s12 += s23 * 470296;
  s13 += s23 * 654183;
  s14 -= s23 * 997805;
  s15 += s23 * 136657;
  s16 -= s23 * 683901;
  s23 = 0;

  s10 += s22 * 666643;
  s11 += s22 * 470296;
  s12 += s22 * 654183;
  s13 -= s22 * 997805;
  s14 += s22 * 136657;
  s15 -= s22 * 683901;
  s22 = 0;

  s9 += s21 * 666643;
  s10 += s21 * 470296;
  s11 += s21 * 654183;
  s12 -= s21 * 997805;
  s13 += s21 * 136657;
  s14 -= s21 * 683901;
  s21 = 0;

  s8 += s20 * 666643;
  s9 += s20 * 470296;
  s10 += s20 * 654183;
  s11 -= s20 * 997805;
  s12 += s20 * 136657;
  s13 -= s20 * 683901;
  s20 = 0;

  s7 += s19 * 666643;
  s8 += s19 * 470296;
  s9 += s19 * 654183;
  s10 -= s19 * 997805;
  s11 += s19 * 136657;
  s12 -= s19 * 683901;
  s19 = 0;

  s6 += s18 * 666643;
  s7 += s18 * 470296;
  s8 += s18 * 654183;
  s9 -= s18 * 997805;
  s10 += s18 * 136657;
  s11 -= s18 * 683901;
  s18 = 0;

  carry6 = (s6 + (1 << 20)) >> 21;
  s7 += carry6;
  s6 -= carry6 << 21;
  carry8 = (s8 + (1 << 20)) >> 21;
  s9 += carry8;
  s8 -= carry8 << 21;
  carry10 = (s10 + (1 << 20)) >> 21;
  s11 += carry10;
  s10 -= carry10 << 21;
  carry12 = (s12 + (1 << 20)) >> 21;
  s13 += carry12;
  s12 -= carry12 << 21;
  carry14 = (s14 + (1 << 20)) >> 21;
  s15 += carry14;
  s14 -= carry14 << 21;
  carry16 = (s16 + (1 << 20)) >> 21;
  s17 += carry16;
  s16 -= carry16 << 21;

  carry7 = (s7 + (1 << 20)) >> 21;
  s8 += carry7;
  s7 -= carry7 << 21;
  carry9 = (s9 + (1 << 20)) >> 21;
  s10 += carry9;
  s9 -= carry9 << 21;
  carry11 = (s11 + (1 << 20)) >> 21;
  s12 += carry11;
  s11 -= carry11 << 21;
  carry13 = (s13 + (1 << 20)) >> 21;
  s14 += carry13;
  s13 -= carry13 << 21;
  carry15 = (s15 + (1 << 20)) >> 21;
  s16 += carry15;
  s15 -= carry15 << 21;

  s5 += s17 * 666643;
  s6 += s17 * 470296;
  s7 += s17 * 654183;
  s8 -= s17 * 997805;
  s9 += s17 * 136657;
  s10 -= s17 * 683901;
  s17 = 0;

  s4 += s16 * 666643;
  s5 += s16 * 470296;
  s6 += s16 * 654183;
  s7 -= s16 * 997805;
  s8 += s16 * 136657;
  s9 -= s16 * 683901;
  s16 = 0;

  s3 += s15 * 666643;
  s4 += s15 * 470296;
  s5 += s15 * 654183;
  s6 -= s15 * 997805;
  s7 += s15 * 136657;
  s8 -= s15 * 683901;
  s15 = 0;

  s2 += s14 * 666643;
  s3 += s14 * 470296;
  s4 += s14 * 654183;
  s5 -= s14 * 997805;
  s6 += s14 * 136657;
  s7 -= s14 * 683901;
  s14 = 0;

  s1 += s13 * 666643;
  s2 += s13 * 470296;
  s3 += s13 * 654183;
  s4 -= s13 * 997805;
  s5 += s13 * 136657;
  s6 -= s13 * 683901;
  s13 = 0;

  s0 += s12 * 666643;
  s1 += s12 * 470296;
  s2 += s12 * 654183;
  s3 -= s12 * 997805;
  s4 += s12 * 136657;
  s5 -= s12 * 683901;
  s12 = 0;

  carry0 = (s0 + (1 << 20)) >> 21;
  s1 += carry0;
  s0 -= carry0 << 21;
  carry2 = (s2 + (1 << 20)) >> 21;
  s3 += carry2;
  s2 -= carry2 << 21;
  carry4 = (s4 + (1 << 20)) >> 21;
  s5 += carry4;
  s4 -= carry4 << 21;
  carry6 = (s6 + (1 << 20)) >> 21;
  s7 += carry6;
  s6 -= carry6 << 21;
  carry8 = (s8 + (1 << 20)) >> 21;
  s9 += carry8;
  s8 -= carry8 << 21;
  carry10 = (s10 + (1 << 20)) >> 21;
  s11 += carry10;
  s10 -= carry10 << 21;

  carry1 = (s1 + (1 << 20)) >> 21;
  s2 += carry1;
  s1 -= carry1 << 21;
  carry3 = (s3 + (1 << 20)) >> 21;
  s4 += carry3;
  s3 -= carry3 << 21;
  carry5 = (s5 + (1 << 20)) >> 21;
  s6 += carry5;
  s5 -= carry5 << 21;
  carry7 = (s7 + (1 << 20)) >> 21;
  s8 += carry7;
  s7 -= carry7 << 21;
  carry9 = (s9 + (1 << 20)) >> 21;
  s10 += carry9;
  s9 -= carry9 << 21;
  carry11 = (s11 + (1 << 20)) >> 21;
  s12 += carry11;
  s11 -= carry11 << 21;

  s0 += s12 * 666643;
  s1 += s12 * 470296;
  s2 += s12 * 654183;
  s3 -= s12 * 997805;
  s4 += s12 * 136657;
  s5 -= s12 * 683901;
  s12 = 0;

  carry0 = s0 >> 21;
  s1 += carry0;
  s0 -= carry0 << 21;
  carry1 = s1 >> 21;
  s2 += carry1;
  s1 -= carry1 << 21;
  carry2 = s2 >> 21;
  s3 += carry2;
  s2 -= carry2 << 21;
  carry3 = s3 >> 21;
  s4 += carry3;
  s3 -= carry3 << 21;
  carry4 = s4 >> 21;
  s5 += carry4;
  s4 -= carry4 << 21;
  carry5 = s5 >> 21;
  s6 += carry5;
  s5 -= carry5 << 21;
  carry6 = s6 >> 21;
  s7 += carry6;
  s6 -= carry6 << 21;
  carry7 = s7 >> 21;
  s8 += carry7;
  s7 -= carry7 << 21;
  carry8 = s8 >> 21;
  s9 += carry8;
  s8 -= carry8 << 21;
  carry9 = s9 >> 21;
  s10 += carry9;
  s9 -= carry9 << 21;
  carry10 = s10 >> 21;
  s11 += carry10;
  s10 -= carry10 << 21;
  carry11 = s11 >> 21;
  s12 += carry11;
  s11 -= carry11 << 21;

  s0 += s12 * 666643;
  s1 += s12 * 470296;
  s2 += s12 * 654183;
  s3 -= s12 * 997805;
  s4 += s12 * 136657;
  s5 -= s12 * 683901;
  s12 = 0;

  carry0 = s0 >> 21;
  s1 += carry0;
  s0 -= carry0 << 21;
  carry1 = s1 >> 21;
  s2 += carry1;
  s1 -= carry1 << 21;
  carry2 = s2 >> 21;
  s3 += carry2;
  s2 -= carry2 << 21;
  carry3 = s3 >> 21;
  s4 += carry3;
  s3 -= carry3 << 21;
  carry4 = s4 >> 21;
  s5 += carry4;
  s4 -= carry4 << 21;
  carry5 = s5 >> 21;
  s6 += carry5;
  s5 -= carry5 << 21;
  carry6 = s6 >> 21;
  s7 += carry6;
  s6 -= carry6 << 21;
  carry7 = s7 >> 21;
  s8 += carry7;
  s7 -= carry7 << 21;
  carry8 = s8 >> 21;
  s9 += carry8;
  s8 -= carry8 << 21;
  carry9 = s9 >> 21;
  s10 += carry9;
  s9 -= carry9 << 21;
  carry10 = s10 >> 21;
  s11 += carry10;
  s10 -= carry10 << 21;

  s[0] = s0 >> 0;
  s[1] = s0 >> 8;
  s[2] = (s0 >> 16) | (s1 << 5);
  s[3] = s1 >> 3;
  s[4] = s1 >> 11;
  s[5] = (s1 >> 19) | (s2 << 2);
  s[6] = s2 >> 6;
  s[7] = (s2 >> 14) | (s3 << 7);
  s[8] = s3 >> 1;
  s[9] = s3 >> 9;
  s[10] = (s3 >> 17) | (s4 << 4);
  s[11] = s4 >> 4;
  s[12] = s4 >> 12;
  s[13] = (s4 >> 20) | (s5 << 1);
  s[14] = s5 >> 7;
  s[15] = (s5 >> 15) | (s6 << 6);
  s[16] = s6 >> 2;
  s[17] = s6 >> 10;
  s[18] = (s6 >> 18) | (s7 << 3);
  s[19] = s7 >> 5;
  s[20] = s7 >> 13;
  s[21] = s8 >> 0;
  s[22] = s8 >> 8;
  s[23] = (s8 >> 16) | (s9 << 5);
  s[24] = s9 >> 3;
  s[25] = s9 >> 11;
  s[26] = (s9 >> 19) | (s10 << 2);
  s[27] = s10 >> 6;
  s[28] = (s10 >> 14) | (s11 << 7);
  s[29] = s11 >> 1;
  s[30] = s11 >> 9;
  s[31] = s11 >> 17;
}

/* Input:
 *   a[0]+256*a[1]+...+256^31*a[31] = a
 *   b[0]+256*b[1]+...+256^31*b[31] = b
 *   c[0]+256*c[1]+...+256^31*c[31] = c
 *
 * Output:
 *   s[0]+256*s[1]+...+256^31*s[31] = (ab+c) mod l
 *   where l = 2^252 + 27742317777372353535851937790883648493. */
static void sc_muladd(uint8_t *s, const uint8_t *a, const uint8_t *b,
                      const uint8_t *c) {
  int64_t a0 = 2097151 & load_3(a);
  int64_t a1 = 2097151 & (load_4(a + 2) >> 5);
  int64_t a2 = 2097151 & (load_3(a + 5) >> 2);
  int64_t a3 = 2097151 & (load_4(a + 7) >> 7);
  int64_t a4 = 2097151 & (load_4(a + 10) >> 4);
  int64_t a5 = 2097151 & (load_3(a + 13) >> 1);
  int64_t a6 = 2097151 & (load_4(a + 15) >> 6);
  int64_t a7 = 2097151 & (load_3(a + 18) >> 3);
  int64_t a8 = 2097151 & load_3(a + 21);
  int64_t a9 = 2097151 & (load_4(a + 23) >> 5);
  int64_t a10 = 2097151 & (load_3(a + 26) >> 2);
  int64_t a11 = (load_4(a + 28) >> 7);
  int64_t b0 = 2097151 & load_3(b);
  int64_t b1 = 2097151 & (load_4(b + 2) >> 5);
  int64_t b2 = 2097151 & (load_3(b + 5) >> 2);
  int64_t b3 = 2097151 & (load_4(b + 7) >> 7);
  int64_t b4 = 2097151 & (load_4(b + 10) >> 4);
  int64_t b5 = 2097151 & (load_3(b + 13) >> 1);
  int64_t b6 = 2097151 & (load_4(b + 15) >> 6);
  int64_t b7 = 2097151 & (load_3(b + 18) >> 3);
  int64_t b8 = 2097151 & load_3(b + 21);
  int64_t b9 = 2097151 & (load_4(b + 23) >> 5);
  int64_t b10 = 2097151 & (load_3(b + 26) >> 2);
  int64_t b11 = (load_4(b + 28) >> 7);
  int64_t c0 = 2097151 & load_3(c);
  int64_t c1 = 2097151 & (load_4(c + 2) >> 5);
  int64_t c2 = 2097151 & (load_3(c + 5) >> 2);
  int64_t c3 = 2097151 & (load_4(c + 7) >> 7);
  int64_t c4 = 2097151 & (load_4(c + 10) >> 4);
  int64_t c5 = 2097151 & (load_3(c + 13) >> 1);
  int64_t c6 = 2097151 & (load_4(c + 15) >> 6);
  int64_t c7 = 2097151 & (load_3(c + 18) >> 3);
  int64_t c8 = 2097151 & load_3(c + 21);
  int64_t c9 = 2097151 & (load_4(c + 23) >> 5);
  int64_t c10 = 2097151 & (load_3(c + 26) >> 2);
  int64_t c11 = (load_4(c + 28) >> 7);
  int64_t s0;
  int64_t s1;
  int64_t s2;
  int64_t s3;
  int64_t s4;
  int64_t s5;
  int64_t s6;
  int64_t s7;
  int64_t s8;
  int64_t s9;
  int64_t s10;
  int64_t s11;
  int64_t s12;
  int64_t s13;
  int64_t s14;
  int64_t s15;
  int64_t s16;
  int64_t s17;
  int64_t s18;
  int64_t s19;
  int64_t s20;
  int64_t s21;
  int64_t s22;
  int64_t s23;
  int64_t carry0;
  int64_t carry1;
  int64_t carry2;
  int64_t carry3;
  int64_t carry4;
  int64_t carry5;
  int64_t carry6;
  int64_t carry7;
  int64_t carry8;
  int64_t carry9;
  int64_t carry10;
  int64_t carry11;
  int64_t carry12;
  int64_t carry13;
  int64_t carry14;
  int64_t carry15;
  int64_t carry16;
  int64_t carry17;
  int64_t carry18;
  int64_t carry19;
  int64_t carry20;
  int64_t carry21;
  int64_t carry22;

  s0 = c0 + a0 * b0;
  s1 = c1 + a0 * b1 + a1 * b0;
  s2 = c2 + a0 * b2 + a1 * b1 + a2 * b0;
  s3 = c3 + a0 * b3 + a1 * b2 + a2 * b1 + a3 * b0;
  s4 = c4 + a0 * b4 + a1 * b3 + a2 * b2 + a3 * b1 + a4 * b0;
  s5 = c5 + a0 * b5 + a1 * b4 + a2 * b3 + a3 * b2 + a4 * b1 + a5 * b0;
  s6 = c6 + a0 * b6 + a1 * b5 + a2 * b4 + a3 * b3 + a4 * b2 + a5 * b1 + a6 * b0;
  s7 = c7 + a0 * b7 + a1 * b6 + a2 * b5 + a3 * b4 + a4 * b3 + a5 * b2 +
       a6 * b1 + a7 * b0;
  s8 = c8 + a0 * b8 + a1 * b7 + a2 * b6 + a3 * b5 + a4 * b4 + a5 * b3 +
       a6 * b2 + a7 * b1 + a8 * b0;
  s9 = c9 + a0 * b9 + a1 * b8 + a2 * b7 + a3 * b6 + a4 * b5 + a5 * b4 +
       a6 * b3 + a7 * b2 + a8 * b1 + a9 * b0;
  s10 = c10 + a0 * b10 + a1 * b9 + a2 * b8 + a3 * b7 + a4 * b6 + a5 * b5 +
        a6 * b4 + a7 * b3 + a8 * b2 + a9 * b1 + a10 * b0;
  s11 = c11 + a0 * b11 + a1 * b10 + a2 * b9 + a3 * b8 + a4 * b7 + a5 * b6 +
        a6 * b5 + a7 * b4 + a8 * b3 + a9 * b2 + a10 * b1 + a11 * b0;
  s12 = a1 * b11 + a2 * b10 + a3 * b9 + a4 * b8 + a5 * b7 + a6 * b6 + a7 * b5 +
        a8 * b4 + a9 * b3 + a10 * b2 + a11 * b1;
  s13 = a2 * b11 + a3 * b10 + a4 * b9 + a5 * b8 + a6 * b7 + a7 * b6 + a8 * b5 +
        a9 * b4 + a10 * b3 + a11 * b2;
  s14 = a3 * b11 + a4 * b10 + a5 * b9 + a6 * b8 + a7 * b7 + a8 * b6 + a9 * b5 +
        a10 * b4 + a11 * b3;
  s15 = a4 * b11 + a5 * b10 + a6 * b9 + a7 * b8 + a8 * b7 + a9 * b6 + a10 * b5 +
        a11 * b4;
  s16 = a5 * b11 + a6 * b10 + a7 * b9 + a8 * b8 + a9 * b7 + a10 * b6 + a11 * b5;
  s17 = a6 * b11 + a7 * b10 + a8 * b9 + a9 * b8 + a10 * b7 + a11 * b6;
  s18 = a7 * b11 + a8 * b10 + a9 * b9 + a10 * b8 + a11 * b7;
  s19 = a8 * b11 + a9 * b10 + a10 * b9 + a11 * b8;
  s20 = a9 * b11 + a10 * b10 + a11 * b9;
  s21 = a10 * b11 + a11 * b10;
  s22 = a11 * b11;
  s23 = 0;

  carry0 = (s0 + (1 << 20)) >> 21;
  s1 += carry0;
  s0 -= carry0 << 21;
  carry2 = (s2 + (1 << 20)) >> 21;
  s3 += carry2;
  s2 -= carry2 << 21;
  carry4 = (s4 + (1 << 20)) >> 21;
  s5 += carry4;
  s4 -= carry4 << 21;
  carry6 = (s6 + (1 << 20)) >> 21;
  s7 += carry6;
  s6 -= carry6 << 21;
  carry8 = (s8 + (1 << 20)) >> 21;
  s9 += carry8;
  s8 -= carry8 << 21;
  carry10 = (s10 + (1 << 20)) >> 21;
  s11 += carry10;
  s10 -= carry10 << 21;
  carry12 = (s12 + (1 << 20)) >> 21;
  s13 += carry12;
  s12 -= carry12 << 21;
  carry14 = (s14 + (1 << 20)) >> 21;
  s15 += carry14;
  s14 -= carry14 << 21;
  carry16 = (s16 + (1 << 20)) >> 21;
  s17 += carry16;
  s16 -= carry16 << 21;
  carry18 = (s18 + (1 << 20)) >> 21;
  s19 += carry18;
  s18 -= carry18 << 21;
  carry20 = (s20 + (1 << 20)) >> 21;
  s21 += carry20;
  s20 -= carry20 << 21;
  carry22 = (s22 + (1 << 20)) >> 21;
  s23 += carry22;
  s22 -= carry22 << 21;

  carry1 = (s1 + (1 << 20)) >> 21;
  s2 += carry1;
  s1 -= carry1 << 21;
  carry3 = (s3 + (1 << 20)) >> 21;
  s4 += carry3;
  s3 -= carry3 << 21;
  carry5 = (s5 + (1 << 20)) >> 21;
  s6 += carry5;
  s5 -= carry5 << 21;
  carry7 = (s7 + (1 << 20)) >> 21;
  s8 += carry7;
  s7 -= carry7 << 21;
  carry9 = (s9 + (1 << 20)) >> 21;
  s10 += carry9;
  s9 -= carry9 << 21;
  carry11 = (s11 + (1 << 20)) >> 21;
  s12 += carry11;
  s11 -= carry11 << 21;
  carry13 = (s13 + (1 << 20)) >> 21;
  s14 += carry13;
  s13 -= carry13 << 21;
  carry15 = (s15 + (1 << 20)) >> 21;
  s16 += carry15;
  s15 -= carry15 << 21;
  carry17 = (s17 + (1 << 20)) >> 21;
  s18 += carry17;
  s17 -= carry17 << 21;
  carry19 = (s19 + (1 << 20)) >> 21;
  s20 += carry19;
  s19 -= carry19 << 21;
  carry21 = (s21 + (1 << 20)) >> 21;
  s22 += carry21;
  s21 -= carry21 << 21;

  s11 += s23 * 666643;
  s12 += s23 * 470296;
  s13 += s23 * 654183;
  s14 -= s23 * 997805;
  s15 += s23 * 136657;
  s16 -= s23 * 683901;
  s23 = 0;

  s10 += s22 * 666643;
  s11 += s22 * 470296;
  s12 += s22 * 654183;
  s13 -= s22 * 997805;
  s14 += s22 * 136657;
  s15 -= s22 * 683901;
  s22 = 0;

  s9 += s21 * 666643;
  s10 += s21 * 470296;
  s11 += s21 * 654183;
  s12 -= s21 * 997805;
  s13 += s21 * 136657;
  s14 -= s21 * 683901;
  s21 = 0;

  s8 += s20 * 666643;
  s9 += s20 * 470296;
  s10 += s20 * 654183;
  s11 -= s20 * 997805;
  s12 += s20 * 136657;
  s13 -= s20 * 683901;
  s20 = 0;

  s7 += s19 * 666643;
  s8 += s19 * 470296;
  s9 += s19 * 654183;
  s10 -= s19 * 997805;
  s11 += s19 * 136657;
  s12 -= s19 * 683901;
  s19 = 0;

  s6 += s18 * 666643;
  s7 += s18 * 470296;
  s8 += s18 * 654183;
  s9 -= s18 * 997805;
  s10 += s18 * 136657;
  s11 -= s18 * 683901;
  s18 = 0;

  carry6 = (s6 + (1 << 20)) >> 21;
  s7 += carry6;
  s6 -= carry6 << 21;
  carry8 = (s8 + (1 << 20)) >> 21;
  s9 += carry8;
  s8 -= carry8 << 21;
  carry10 = (s10 + (1 << 20)) >> 21;
  s11 += carry10;
  s10 -= carry10 << 21;
  carry12 = (s12 + (1 << 20)) >> 21;
  s13 += carry12;
  s12 -= carry12 << 21;
  carry14 = (s14 + (1 << 20)) >> 21;
  s15 += carry14;
  s14 -= carry14 << 21;
  carry16 = (s16 + (1 << 20)) >> 21;
  s17 += carry16;
  s16 -= carry16 << 21;

  carry7 = (s7 + (1 << 20)) >> 21;
  s8 += carry7;
  s7 -= carry7 << 21;
  carry9 = (s9 + (1 << 20)) >> 21;
  s10 += carry9;
  s9 -= carry9 << 21;
  carry11 = (s11 + (1 << 20)) >> 21;
  s12 += carry11;
  s11 -= carry11 << 21;
  carry13 = (s13 + (1 << 20)) >> 21;
  s14 += carry13;
  s13 -= carry13 << 21;
  carry15 = (s15 + (1 << 20)) >> 21;
  s16 += carry15;
  s15 -= carry15 << 21;

  s5 += s17 * 666643;
  s6 += s17 * 470296;
  s7 += s17 * 654183;
  s8 -= s17 * 997805;
  s9 += s17 * 136657;
  s10 -= s17 * 683901;
  s17 = 0;

  s4 += s16 * 666643;
  s5 += s16 * 470296;
  s6 += s16 * 654183;
  s7 -= s16 * 997805;
  s8 += s16 * 136657;
  s9 -= s16 * 683901;
  s16 = 0;

  s3 += s15 * 666643;
  s4 += s15 * 470296;
  s5 += s15 * 654183;
  s6 -= s15 * 997805;
  s7 += s15 * 136657;
  s8 -= s15 * 683901;
  s15 = 0;

  s2 += s14 * 666643;
  s3 += s14 * 470296;
  s4 += s14 * 654183;
  s5 -= s14 * 997805;
  s6 += s14 * 136657;
  s7 -= s14 * 683901;
  s14 = 0;

  s1 += s13 * 666643;
  s2 += s13 * 470296;
  s3 += s13 * 654183;
  s4 -= s13 * 997805;
  s5 += s13 * 136657;
  s6 -= s13 * 683901;
  s13 = 0;

  s0 += s12 * 666643;
  s1 += s12 * 470296;
  s2 += s12 * 654183;
  s3 -= s12 * 997805;
  s4 += s12 * 136657;
  s5 -= s12 * 683901;
  s12 = 0;

  carry0 = (s0 + (1 << 20)) >> 21;
  s1 += carry0;
  s0 -= carry0 << 21;
  carry2 = (s2 + (1 << 20)) >> 21;
  s3 += carry2;
  s2 -= carry2 << 21;
  carry4 = (s4 + (1 << 20)) >> 21;
  s5 += carry4;
  s4 -= carry4 << 21;
  carry6 = (s6 + (1 << 20)) >> 21;
  s7 += carry6;
  s6 -= carry6 << 21;
  carry8 = (s8 + (1 << 20)) >> 21;
  s9 += carry8;
  s8 -= carry8 << 21;
  carry10 = (s10 + (1 << 20)) >> 21;
  s11 += carry10;
  s10 -= carry10 << 21;

  carry1 = (s1 + (1 << 20)) >> 21;
  s2 += carry1;
  s1 -= carry1 << 21;
  carry3 = (s3 + (1 << 20)) >> 21;
  s4 += carry3;
  s3 -= carry3 << 21;
  carry5 = (s5 + (1 << 20)) >> 21;
  s6 += carry5;
  s5 -= carry5 << 21;
  carry7 = (s7 + (1 << 20)) >> 21;
  s8 += carry7;
  s7 -= carry7 << 21;
  carry9 = (s9 + (1 << 20)) >> 21;
  s10 += carry9;
  s9 -= carry9 << 21;
  carry11 = (s11 + (1 << 20)) >> 21;
  s12 += carry11;
  s11 -= carry11 << 21;

  s0 += s12 * 666643;
  s1 += s12 * 470296;
  s2 += s12 * 654183;
  s3 -= s12 * 997805;
  s4 += s12 * 136657;
  s5 -= s12 * 683901;
  s12 = 0;

  carry0 = s0 >> 21;
  s1 += carry0;
  s0 -= carry0 << 21;
  carry1 = s1 >> 21;
  s2 += carry1;
  s1 -= carry1 << 21;
  carry2 = s2 >> 21;
  s3 += carry2;
  s2 -= carry2 << 21;
  carry3 = s3 >> 21;
  s4 += carry3;
  s3 -= carry3 << 21;
  carry4 = s4 >> 21;
  s5 += carry4;
  s4 -= carry4 << 21;
  carry5 = s5 >> 21;
  s6 += carry5;
  s5 -= carry5 << 21;
  carry6 = s6 >> 21;
  s7 += carry6;
  s6 -= carry6 << 21;
  carry7 = s7 >> 21;
  s8 += carry7;
  s7 -= carry7 << 21;
  carry8 = s8 >> 21;
  s9 += carry8;
  s8 -= carry8 << 21;
  carry9 = s9 >> 21;
  s10 += carry9;
  s9 -= carry9 << 21;
  carry10 = s10 >> 21;
  s11 += carry10;
  s10 -= carry10 << 21;
  carry11 = s11 >> 21;
  s12 += carry11;
  s11 -= carry11 << 21;

  s0 += s12 * 666643;
  s1 += s12 * 470296;
  s2 += s12 * 654183;
  s3 -= s12 * 997805;
  s4 += s12 * 136657;
  s5 -= s12 * 683901;
  s12 = 0;

  carry0 = s0 >> 21;
  s1 += carry0;
  s0 -= carry0 << 21;
  carry1 = s1 >> 21;
  s2 += carry1;
  s1 -= carry1 << 21;
  carry2 = s2 >> 21;
  s3 += carry2;
  s2 -= carry2 << 21;
  carry3 = s3 >> 21;
  s4 += carry3;
  s3 -= carry3 << 21;
  carry4 = s4 >> 21;
  s5 += carry4;
  s4 -= carry4 << 21;
  carry5 = s5 >> 21;
  s6 += carry5;
  s5 -= carry5 << 21;
  carry6 = s6 >> 21;
  s7 += carry6;
  s6 -= carry6 << 21;
  carry7 = s7 >> 21;
  s8 += carry7;
  s7 -= carry7 << 21;
  carry8 = s8 >> 21;
  s9 += carry8;
  s8 -= carry8 << 21;
  carry9 = s9 >> 21;
  s10 += carry9;
  s9 -= carry9 << 21;
  carry10 = s10 >> 21;
  s11 += carry10;
  s10 -= carry10 << 21;

  s[0] = s0 >> 0;
  s[1] = s0 >> 8;
  s[2] = (s0 >> 16) | (s1 << 5);
  s[3] = s1 >> 3;
  s[4] = s1 >> 11;
  s[5] = (s1 >> 19) | (s2 << 2);
  s[6] = s2 >> 6;
  s[7] = (s2 >> 14) | (s3 << 7);
  s[8] = s3 >> 1;
  s[9] = s3 >> 9;
  s[10] = (s3 >> 17) | (s4 << 4);
  s[11] = s4 >> 4;
  s[12] = s4 >> 12;
  s[13] = (s4 >> 20) | (s5 << 1);
  s[14] = s5 >> 7;
  s[15] = (s5 >> 15) | (s6 << 6);
  s[16] = s6 >> 2;
  s[17] = s6 >> 10;
  s[18] = (s6 >> 18) | (s7 << 3);
  s[19] = s7 >> 5;
  s[20] = s7 >> 13;
  s[21] = s8 >> 0;
  s[22] = s8 >> 8;
  s[23] = (s8 >> 16) | (s9 << 5);
  s[24] = s9 >> 3;
  s[25] = s9 >> 11;
  s[26] = (s9 >> 19) | (s10 << 2);
  s[27] = s10 >> 6;
  s[28] = (s10 >> 14) | (s11 << 7);
  s[29] = s11 >> 1;
  s[30] = s11 >> 9;
  s[31] = s11 >> 17;
}

void ED25519_keypair(uint8_t out_public_key[32], uint8_t out_private_key[64]) {
  uint8_t seed[32];
  RAND_bytes(seed, 32);

  uint8_t az[SHA512_DIGEST_LENGTH];
  SHA512(seed, 32, az);

  az[0] &= 248;
  az[31] &= 63;
  az[31] |= 64;

  ge_p3 A;
  ge_scalarmult_base(&A, az);
  ge_p3_tobytes(out_public_key, &A);

  memcpy(out_private_key, seed, 32);
  memmove(out_private_key + 32, out_public_key, 32);
}

int ED25519_sign(uint8_t *out_sig, const uint8_t *message, size_t message_len,
                 const uint8_t private_key[64]) {
  uint8_t az[SHA512_DIGEST_LENGTH];
  SHA512(private_key, 32, az);

  az[0] &= 248;
  az[31] &= 63;
  az[31] |= 64;

  SHA512_CTX hash_ctx;
  SHA512_Init(&hash_ctx);
  SHA512_Update(&hash_ctx, az + 32, 32);
  SHA512_Update(&hash_ctx, message, message_len);
  uint8_t nonce[SHA512_DIGEST_LENGTH];
  SHA512_Final(nonce, &hash_ctx);

  sc_reduce(nonce);
  ge_p3 R;
  ge_scalarmult_base(&R, nonce);
  ge_p3_tobytes(out_sig, &R);

  SHA512_Init(&hash_ctx);
  SHA512_Update(&hash_ctx, out_sig, 32);
  SHA512_Update(&hash_ctx, private_key + 32, 32);
  SHA512_Update(&hash_ctx, message, message_len);
  uint8_t hram[SHA512_DIGEST_LENGTH];
  SHA512_Final(hram, &hash_ctx);

  sc_reduce(hram);
  sc_muladd(out_sig + 32, hram, az, nonce);

  return 1;
}

int ED25519_verify(const uint8_t *message, size_t message_len,
                   const uint8_t signature[64], const uint8_t public_key[32]) {
  ge_p3 A;
  if ((signature[63] & 224) != 0 ||
      ge_frombytes_negate_vartime(&A, public_key) != 0) {
    return 0;
  }

  uint8_t pkcopy[32];
  memcpy(pkcopy, public_key, 32);
  uint8_t rcopy[32];
  memcpy(rcopy, signature, 32);
  uint8_t scopy[32];
  memcpy(scopy, signature + 32, 32);

  SHA512_CTX hash_ctx;
  SHA512_Init(&hash_ctx);
  SHA512_Update(&hash_ctx, signature, 32);
  SHA512_Update(&hash_ctx, public_key, 32);
  SHA512_Update(&hash_ctx, message, message_len);
  uint8_t h[SHA512_DIGEST_LENGTH];
  SHA512_Final(h, &hash_ctx);

  sc_reduce(h);

  ge_p2 R;
  ge_double_scalarmult_vartime(&R, h, &A, scopy);

  uint8_t rcheck[32];
  ge_tobytes(rcheck, &R);

  return CRYPTO_memcmp(rcheck, rcopy, sizeof(rcheck)) == 0;
}

static void x25519_scalar_mult_generic(uint8_t out[32],
                                       const uint8_t scalar[32],
                                       const uint8_t point[32]) {
  fe x1, x2, z2, x3, z3, tmp0, tmp1;

  uint8_t e[32];
  memcpy(e, scalar, 32);
  e[0] &= 248;
  e[31] &= 127;
  e[31] |= 64;
  fe_frombytes(x1, point);
  fe_1(x2);
  fe_0(z2);
  fe_copy(x3, x1);
  fe_1(z3);

  unsigned swap = 0;
  int pos;
  for (pos = 254; pos >= 0; --pos) {
    unsigned b = 1 & (e[pos / 8] >> (pos & 7));
    swap ^= b;
    fe_cswap(x2, x3, swap);
    fe_cswap(z2, z3, swap);
    swap = b;
    fe_sub(tmp0, x3, z3);
    fe_sub(tmp1, x2, z2);
    fe_add(x2, x2, z2);
    fe_add(z2, x3, z3);
    fe_mul(z3, tmp0, x2);
    fe_mul(z2, z2, tmp1);
    fe_sq(tmp0, tmp1);
    fe_sq(tmp1, x2);
    fe_add(x3, z3, z2);
    fe_sub(z2, z3, z2);
    fe_mul(x2, tmp1, tmp0);
    fe_sub(tmp1, tmp1, tmp0);
    fe_sq(z2, z2);
    fe_mul121666(z3, tmp1);
    fe_sq(x3, x3);
    fe_add(tmp0, tmp0, z3);
    fe_mul(z3, x1, z2);
    fe_mul(z2, tmp1, tmp0);
  }
  fe_cswap(x2, x3, swap);
  fe_cswap(z2, z3, swap);

  fe_invert(z2, z2);
  fe_mul(x2, x2, z2);
  fe_tobytes(out, x2);
}

#if defined(OPENSSL_ARM)
/* x25519_NEON is defined in asm/x25519-arm.S. */
void x25519_NEON(uint8_t out[32], const uint8_t scalar[32],
                 const uint8_t point[32]);
#endif

static void x25519_scalar_mult(uint8_t out[32], const uint8_t scalar[32],
                               const uint8_t point[32]) {
#if defined(OPENSSL_ARM)
  if (CRYPTO_is_NEON_capable()) {
    x25519_NEON(out, scalar, point);
    return;
  }
#endif

  x25519_scalar_mult_generic(out, scalar, point);
}

void X25519_keypair(uint8_t out_public_value[32], uint8_t out_private_key[32]) {
  RAND_bytes(out_private_key, 32);
  X25519_public_from_private(out_public_value, out_private_key);
}

int X25519(uint8_t out_shared_key[32], const uint8_t private_key[32],
           const uint8_t peer_public_value[32]) {
  static const uint8_t kZeros[32] = {0};
  x25519_scalar_mult(out_shared_key, private_key, peer_public_value);
  /* The all-zero output results when the input is a point of small order. */
  return CRYPTO_memcmp(kZeros, out_shared_key, 32) != 0;
}

void X25519_public_from_private(uint8_t out_public_value[32],
                                const uint8_t private_key[32]) {
#if defined(OPENSSL_ARM)
  if (CRYPTO_is_NEON_capable()) {
    static const uint8_t kMongomeryBasePoint[32] = {9};
    x25519_NEON(out_public_value, private_key, kMongomeryBasePoint);
    return;
  }
#endif

  uint8_t e[32];
  memcpy(e, private_key, 32);
  e[0] &= 248;
  e[31] &= 127;
  e[31] |= 64;

  ge_p3 A;
  ge_scalarmult_base(&A, e);

  /* We only need the u-coordinate of the curve25519 point. The map is
   * u=(y+1)/(1-y). Since y=Y/Z, this gives u=(Z+Y)/(Z-Y). */
  fe zplusy, zminusy, zminusy_inv;
  fe_add(zplusy, A.Z, A.Y);
  fe_sub(zminusy, A.Z, A.Y);
  fe_invert(zminusy_inv, zminusy);
  fe_mul(zplusy, zplusy, zminusy_inv);
  fe_tobytes(out_public_value, zplusy);
}