crypto/poly1305/poly1305_arm.c - boringssl - Git at Google

 /* Copyright (c) 2014, 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 implementation was taken from the public domain, neon2 version in
 // SUPERCOP by D. J. Bernstein and Peter Schwabe.

 #include <openssl/poly1305.h>

 #include <assert.h>
 #include <string.h>

 #include "../internal.h"
 #include "internal.h"


 #if defined(OPENSSL_POLY1305_NEON)

 typedef struct {
   uint32_t v[12];  // for alignment; only using 10
 } fe1305x2;

 #define addmulmod openssl_poly1305_neon2_addmulmod
 #define blocks openssl_poly1305_neon2_blocks

 extern void addmulmod(fe1305x2 *r, const fe1305x2 *x, const fe1305x2 *y,
                       const fe1305x2 *c);

 extern int blocks(fe1305x2 *h, const fe1305x2 *precomp, const uint8_t *in,
                   size_t inlen);

 static void freeze(fe1305x2 *r) {
   int i;

   uint32_t x0 = r->v[0];
   uint32_t x1 = r->v[2];
   uint32_t x2 = r->v[4];
   uint32_t x3 = r->v[6];
   uint32_t x4 = r->v[8];
   uint32_t y0;
   uint32_t y1;
   uint32_t y2;
   uint32_t y3;
   uint32_t y4;
   uint32_t swap;

   for (i = 0; i < 3; ++i) {
     x1 += x0 >> 26;
     x0 &= 0x3ffffff;
     x2 += x1 >> 26;
     x1 &= 0x3ffffff;
     x3 += x2 >> 26;
     x2 &= 0x3ffffff;
     x4 += x3 >> 26;
     x3 &= 0x3ffffff;
     x0 += 5 * (x4 >> 26);
     x4 &= 0x3ffffff;
   }

   y0 = x0 + 5;
   y1 = x1 + (y0 >> 26);
   y0 &= 0x3ffffff;
   y2 = x2 + (y1 >> 26);
   y1 &= 0x3ffffff;
   y3 = x3 + (y2 >> 26);
   y2 &= 0x3ffffff;
   y4 = x4 + (y3 >> 26);
   y3 &= 0x3ffffff;
   swap = -(y4 >> 26);
   y4 &= 0x3ffffff;

   y0 ^= x0;
   y1 ^= x1;
   y2 ^= x2;
   y3 ^= x3;
   y4 ^= x4;

   y0 &= swap;
   y1 &= swap;
   y2 &= swap;
   y3 &= swap;
   y4 &= swap;

   y0 ^= x0;
   y1 ^= x1;
   y2 ^= x2;
   y3 ^= x3;
   y4 ^= x4;

   r->v[0] = y0;
   r->v[2] = y1;
   r->v[4] = y2;
   r->v[6] = y3;
   r->v[8] = y4;
 }

 static void store32(uint8_t out[4], uint32_t v) { OPENSSL_memcpy(out, &v, 4); }

 // load32 exists to avoid breaking strict aliasing rules in
 // fe1305x2_frombytearray.
 static uint32_t load32(const uint8_t t[4]) {
   uint32_t tmp;
   OPENSSL_memcpy(&tmp, t, sizeof(tmp));
   return tmp;
 }

 static void fe1305x2_tobytearray(uint8_t r[16], fe1305x2 *x) {
   uint32_t x0 = x->v[0];
   uint32_t x1 = x->v[2];
   uint32_t x2 = x->v[4];
   uint32_t x3 = x->v[6];
   uint32_t x4 = x->v[8];

   x1 += x0 >> 26;
   x0 &= 0x3ffffff;
   x2 += x1 >> 26;
   x1 &= 0x3ffffff;
   x3 += x2 >> 26;
   x2 &= 0x3ffffff;
   x4 += x3 >> 26;
   x3 &= 0x3ffffff;

   store32(r, x0 + (x1 << 26));
   store32(r + 4, (x1 >> 6) + (x2 << 20));
   store32(r + 8, (x2 >> 12) + (x3 << 14));
   store32(r + 12, (x3 >> 18) + (x4 << 8));
 }

 static void fe1305x2_frombytearray(fe1305x2 *r, const uint8_t *x, size_t xlen) {
   size_t i;
   uint8_t t[17];

   for (i = 0; (i < 16) && (i < xlen); i++) {
     t[i] = x[i];
   }
   xlen -= i;
   x += i;
   t[i++] = 1;
   for (; i < 17; i++) {
     t[i] = 0;
   }

   r->v[0] = 0x3ffffff & load32(t);
   r->v[2] = 0x3ffffff & (load32(t + 3) >> 2);
   r->v[4] = 0x3ffffff & (load32(t + 6) >> 4);
   r->v[6] = 0x3ffffff & (load32(t + 9) >> 6);
   r->v[8] = load32(t + 13);

   if (xlen) {
     for (i = 0; (i < 16) && (i < xlen); i++) {
       t[i] = x[i];
     }
     t[i++] = 1;
     for (; i < 17; i++) {
       t[i] = 0;
     }

     r->v[1] = 0x3ffffff & load32(t);
     r->v[3] = 0x3ffffff & (load32(t + 3) >> 2);
     r->v[5] = 0x3ffffff & (load32(t + 6) >> 4);
     r->v[7] = 0x3ffffff & (load32(t + 9) >> 6);
     r->v[9] = load32(t + 13);
   } else {
     r->v[1] = r->v[3] = r->v[5] = r->v[7] = r->v[9] = 0;
   }
 }

 static const alignas(16) fe1305x2 zero;

 struct poly1305_state_st {
   uint8_t data[sizeof(fe1305x2[5]) + 128];
   uint8_t buf[32];
   size_t buf_used;
   uint8_t key[16];
 };

 static_assert(
     sizeof(struct poly1305_state_st) + 63 <= sizeof(poly1305_state),
     "poly1305_state isn't large enough to hold aligned poly1305_state_st.");

 void CRYPTO_poly1305_init_neon(poly1305_state *state, const uint8_t key[32]) {
   struct poly1305_state_st *st = (struct poly1305_state_st *)(state);
   fe1305x2 *const r = (fe1305x2 *)(st->data + (15 & (-(int)st->data)));
   fe1305x2 *const h = r + 1;
   fe1305x2 *const c = h + 1;
   fe1305x2 *const precomp = c + 1;

   r->v[1] = r->v[0] = 0x3ffffff & load32(key);
   r->v[3] = r->v[2] = 0x3ffff03 & (load32(key + 3) >> 2);
   r->v[5] = r->v[4] = 0x3ffc0ff & (load32(key + 6) >> 4);
   r->v[7] = r->v[6] = 0x3f03fff & (load32(key + 9) >> 6);
   r->v[9] = r->v[8] = 0x00fffff & (load32(key + 12) >> 8);

   for (size_t j = 0; j < 10; j++) {
     h->v[j] = 0;  // XXX: should fast-forward a bit
   }

   addmulmod(precomp, r, r, &zero);                  // precompute r^2
   addmulmod(precomp + 1, precomp, precomp, &zero);  // precompute r^4

   OPENSSL_memcpy(st->key, key + 16, 16);
   st->buf_used = 0;
 }

 void CRYPTO_poly1305_update_neon(poly1305_state *state, const uint8_t *in,
                                  size_t in_len) {
   struct poly1305_state_st *st = (struct poly1305_state_st *)(state);
   fe1305x2 *const r = (fe1305x2 *)(st->data + (15 & (-(int)st->data)));
   fe1305x2 *const h = r + 1;
   fe1305x2 *const c = h + 1;
   fe1305x2 *const precomp = c + 1;

   if (st->buf_used) {
     size_t todo = 32 - st->buf_used;
     if (todo > in_len) {
       todo = in_len;
     }
     for (size_t i = 0; i < todo; i++) {
       st->buf[st->buf_used + i] = in[i];
     }
     st->buf_used += todo;
     in_len -= todo;
     in += todo;

     if (st->buf_used == sizeof(st->buf) && in_len) {
       addmulmod(h, h, precomp, &zero);
       fe1305x2_frombytearray(c, st->buf, sizeof(st->buf));
       for (size_t i = 0; i < 10; i++) {
         h->v[i] += c->v[i];
       }
       st->buf_used = 0;
     }
   }

   while (in_len > 32) {
     size_t tlen = 1048576;
     if (in_len < tlen) {
       tlen = in_len;
     }
     tlen -= blocks(h, precomp, in, tlen);
     in_len -= tlen;
     in += tlen;
   }

   if (in_len) {
     for (size_t i = 0; i < in_len; i++) {
       st->buf[i] = in[i];
     }
     st->buf_used = in_len;
   }
 }

 void CRYPTO_poly1305_finish_neon(poly1305_state *state, uint8_t mac[16]) {
   struct poly1305_state_st *st = (struct poly1305_state_st *)(state);
   fe1305x2 *const r = (fe1305x2 *)(st->data + (15 & (-(int)st->data)));
   fe1305x2 *const h = r + 1;
   fe1305x2 *const c = h + 1;
   fe1305x2 *const precomp = c + 1;

   addmulmod(h, h, precomp, &zero);

   if (st->buf_used > 16) {
     fe1305x2_frombytearray(c, st->buf, st->buf_used);
     precomp->v[1] = r->v[1];
     precomp->v[3] = r->v[3];
     precomp->v[5] = r->v[5];
     precomp->v[7] = r->v[7];
     precomp->v[9] = r->v[9];
     addmulmod(h, h, precomp, c);
   } else if (st->buf_used > 0) {
     fe1305x2_frombytearray(c, st->buf, st->buf_used);
     r->v[1] = 1;
     r->v[3] = 0;
     r->v[5] = 0;
     r->v[7] = 0;
     r->v[9] = 0;
     addmulmod(h, h, r, c);
   }

   h->v[0] += h->v[1];
   h->v[2] += h->v[3];
   h->v[4] += h->v[5];
   h->v[6] += h->v[7];
   h->v[8] += h->v[9];
   freeze(h);

   fe1305x2_frombytearray(c, st->key, 16);
   c->v[8] ^= (1 << 24);

   h->v[0] += c->v[0];
   h->v[2] += c->v[2];
   h->v[4] += c->v[4];
   h->v[6] += c->v[6];
   h->v[8] += c->v[8];
   fe1305x2_tobytearray(mac, h);
 }

 #endif  // OPENSSL_POLY1305_NEON
	/* Copyright (c) 2014, 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 implementation was taken from the public domain, neon2 version in
	// SUPERCOP by D. J. Bernstein and Peter Schwabe.

	#include <openssl/poly1305.h>

	#include <assert.h>
	#include <string.h>

	#include "../internal.h"
	#include "internal.h"


	#if defined(OPENSSL_POLY1305_NEON)

	typedef struct {
	uint32_t v[12]; // for alignment; only using 10
	} fe1305x2;

	#define addmulmod openssl_poly1305_neon2_addmulmod
	#define blocks openssl_poly1305_neon2_blocks

	extern void addmulmod(fe1305x2 r, const fe1305x2 x, const fe1305x2 *y,
	const fe1305x2 *c);

	extern int blocks(fe1305x2 h, const fe1305x2 precomp, const uint8_t *in,
	size_t inlen);

	static void freeze(fe1305x2 *r) {
	int i;

	uint32_t x0 = r->v[0];
	uint32_t x1 = r->v[2];
	uint32_t x2 = r->v[4];
	uint32_t x3 = r->v[6];
	uint32_t x4 = r->v[8];
	uint32_t y0;
	uint32_t y1;
	uint32_t y2;
	uint32_t y3;
	uint32_t y4;
	uint32_t swap;

	for (i = 0; i < 3; ++i) {
	x1 += x0 >> 26;
	x0 &= 0x3ffffff;
	x2 += x1 >> 26;
	x1 &= 0x3ffffff;
	x3 += x2 >> 26;
	x2 &= 0x3ffffff;
	x4 += x3 >> 26;
	x3 &= 0x3ffffff;
	x0 += 5 * (x4 >> 26);
	x4 &= 0x3ffffff;
	}

	y0 = x0 + 5;
	y1 = x1 + (y0 >> 26);
	y0 &= 0x3ffffff;
	y2 = x2 + (y1 >> 26);
	y1 &= 0x3ffffff;
	y3 = x3 + (y2 >> 26);
	y2 &= 0x3ffffff;
	y4 = x4 + (y3 >> 26);
	y3 &= 0x3ffffff;
	swap = -(y4 >> 26);
	y4 &= 0x3ffffff;

	y0 ^= x0;
	y1 ^= x1;
	y2 ^= x2;
	y3 ^= x3;
	y4 ^= x4;

	y0 &= swap;
	y1 &= swap;
	y2 &= swap;
	y3 &= swap;
	y4 &= swap;

	y0 ^= x0;
	y1 ^= x1;
	y2 ^= x2;
	y3 ^= x3;
	y4 ^= x4;

	r->v[0] = y0;
	r->v[2] = y1;
	r->v[4] = y2;
	r->v[6] = y3;
	r->v[8] = y4;
	}

	static void store32(uint8_t out[4], uint32_t v) { OPENSSL_memcpy(out, &v, 4); }

	// load32 exists to avoid breaking strict aliasing rules in
	// fe1305x2_frombytearray.
	static uint32_t load32(const uint8_t t[4]) {
	uint32_t tmp;
	OPENSSL_memcpy(&tmp, t, sizeof(tmp));
	return tmp;
	}

	static void fe1305x2_tobytearray(uint8_t r[16], fe1305x2 *x) {
	uint32_t x0 = x->v[0];
	uint32_t x1 = x->v[2];
	uint32_t x2 = x->v[4];
	uint32_t x3 = x->v[6];
	uint32_t x4 = x->v[8];

	x1 += x0 >> 26;
	x0 &= 0x3ffffff;
	x2 += x1 >> 26;
	x1 &= 0x3ffffff;
	x3 += x2 >> 26;
	x2 &= 0x3ffffff;
	x4 += x3 >> 26;
	x3 &= 0x3ffffff;

	store32(r, x0 + (x1 << 26));
	store32(r + 4, (x1 >> 6) + (x2 << 20));
	store32(r + 8, (x2 >> 12) + (x3 << 14));
	store32(r + 12, (x3 >> 18) + (x4 << 8));
	}

	static void fe1305x2_frombytearray(fe1305x2 r, const uint8_t x, size_t xlen) {
	size_t i;
	uint8_t t[17];

	for (i = 0; (i < 16) && (i < xlen); i++) {
	t[i] = x[i];
	}
	xlen -= i;
	x += i;
	t[i++] = 1;
	for (; i < 17; i++) {
	t[i] = 0;
	}

	r->v[0] = 0x3ffffff & load32(t);
	r->v[2] = 0x3ffffff & (load32(t + 3) >> 2);
	r->v[4] = 0x3ffffff & (load32(t + 6) >> 4);
	r->v[6] = 0x3ffffff & (load32(t + 9) >> 6);
	r->v[8] = load32(t + 13);

	if (xlen) {
	for (i = 0; (i < 16) && (i < xlen); i++) {
	t[i] = x[i];
	}
	t[i++] = 1;
	for (; i < 17; i++) {
	t[i] = 0;
	}

	r->v[1] = 0x3ffffff & load32(t);
	r->v[3] = 0x3ffffff & (load32(t + 3) >> 2);
	r->v[5] = 0x3ffffff & (load32(t + 6) >> 4);
	r->v[7] = 0x3ffffff & (load32(t + 9) >> 6);
	r->v[9] = load32(t + 13);
	} else {
	r->v[1] = r->v[3] = r->v[5] = r->v[7] = r->v[9] = 0;
	}
	}

	static const alignas(16) fe1305x2 zero;

	struct poly1305_state_st {
	uint8_t data[sizeof(fe1305x2[5]) + 128];
	uint8_t buf[32];
	size_t buf_used;
	uint8_t key[16];
	};

	static_assert(
	sizeof(struct poly1305_state_st) + 63 <= sizeof(poly1305_state),
	"poly1305_state isn't large enough to hold aligned poly1305_state_st.");

	void CRYPTO_poly1305_init_neon(poly1305_state *state, const uint8_t key[32]) {
	struct poly1305_state_st st = (struct poly1305_state_st )(state);
	fe1305x2 const r = (fe1305x2 )(st->data + (15 & (-(int)st->data)));
	fe1305x2 *const h = r + 1;
	fe1305x2 *const c = h + 1;
	fe1305x2 *const precomp = c + 1;

	r->v[1] = r->v[0] = 0x3ffffff & load32(key);
	r->v[3] = r->v[2] = 0x3ffff03 & (load32(key + 3) >> 2);
	r->v[5] = r->v[4] = 0x3ffc0ff & (load32(key + 6) >> 4);
	r->v[7] = r->v[6] = 0x3f03fff & (load32(key + 9) >> 6);
	r->v[9] = r->v[8] = 0x00fffff & (load32(key + 12) >> 8);

	for (size_t j = 0; j < 10; j++) {
	h->v[j] = 0; // XXX: should fast-forward a bit
	}

	addmulmod(precomp, r, r, &zero); // precompute r^2
	addmulmod(precomp + 1, precomp, precomp, &zero); // precompute r^4

	OPENSSL_memcpy(st->key, key + 16, 16);
	st->buf_used = 0;
	}

	void CRYPTO_poly1305_update_neon(poly1305_state state, const uint8_t in,
	size_t in_len) {
	struct poly1305_state_st st = (struct poly1305_state_st )(state);
	fe1305x2 const r = (fe1305x2 )(st->data + (15 & (-(int)st->data)));
	fe1305x2 *const h = r + 1;
	fe1305x2 *const c = h + 1;
	fe1305x2 *const precomp = c + 1;

	if (st->buf_used) {
	size_t todo = 32 - st->buf_used;
	if (todo > in_len) {
	todo = in_len;
	}
	for (size_t i = 0; i < todo; i++) {
	st->buf[st->buf_used + i] = in[i];
	}
	st->buf_used += todo;
	in_len -= todo;
	in += todo;

	if (st->buf_used == sizeof(st->buf) && in_len) {
	addmulmod(h, h, precomp, &zero);
	fe1305x2_frombytearray(c, st->buf, sizeof(st->buf));
	for (size_t i = 0; i < 10; i++) {
	h->v[i] += c->v[i];
	}
	st->buf_used = 0;
	}
	}

	while (in_len > 32) {
	size_t tlen = 1048576;
	if (in_len < tlen) {
	tlen = in_len;
	}
	tlen -= blocks(h, precomp, in, tlen);
	in_len -= tlen;
	in += tlen;
	}

	if (in_len) {
	for (size_t i = 0; i < in_len; i++) {
	st->buf[i] = in[i];
	}
	st->buf_used = in_len;
	}
	}

	void CRYPTO_poly1305_finish_neon(poly1305_state *state, uint8_t mac[16]) {
	struct poly1305_state_st st = (struct poly1305_state_st )(state);
	fe1305x2 const r = (fe1305x2 )(st->data + (15 & (-(int)st->data)));
	fe1305x2 *const h = r + 1;
	fe1305x2 *const c = h + 1;
	fe1305x2 *const precomp = c + 1;

	addmulmod(h, h, precomp, &zero);

	if (st->buf_used > 16) {
	fe1305x2_frombytearray(c, st->buf, st->buf_used);
	precomp->v[1] = r->v[1];
	precomp->v[3] = r->v[3];
	precomp->v[5] = r->v[5];
	precomp->v[7] = r->v[7];
	precomp->v[9] = r->v[9];
	addmulmod(h, h, precomp, c);
	} else if (st->buf_used > 0) {
	fe1305x2_frombytearray(c, st->buf, st->buf_used);
	r->v[1] = 1;
	r->v[3] = 0;
	r->v[5] = 0;
	r->v[7] = 0;
	r->v[9] = 0;
	addmulmod(h, h, r, c);
	}

	h->v[0] += h->v[1];
	h->v[2] += h->v[3];
	h->v[4] += h->v[5];
	h->v[6] += h->v[7];
	h->v[8] += h->v[9];
	freeze(h);

	fe1305x2_frombytearray(c, st->key, 16);
	c->v[8] ^= (1 << 24);

	h->v[0] += c->v[0];
	h->v[2] += c->v[2];
	h->v[4] += c->v[4];
	h->v[6] += c->v[6];
	h->v[8] += c->v[8];
	fe1305x2_tobytearray(mac, h);
	}

	#endif // OPENSSL_POLY1305_NEON