crypto/poly1305/internal.h

// Copyright 2016 The BoringSSL Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef OPENSSL_HEADER_CRYPTO_POLY1305_INTERNAL_H
#define OPENSSL_HEADER_CRYPTO_POLY1305_INTERNAL_H

#include <openssl/base.h>
#include <openssl/poly1305.h>


BSSL_NAMESPACE_BEGIN

#if defined(OPENSSL_ARM) && !defined(OPENSSL_NO_ASM) && !defined(OPENSSL_APPLE)
#define OPENSSL_POLY1305_NEON

struct alignas(16) fe1305x2 {
  uint32_t v[12];  // for alignment; only using 10
};

extern "C" {
// openssl_poly1305_neon2_addmulmod computes (x * y) + c and writes the result
// to `r`.
void openssl_poly1305_neon2_addmulmod(fe1305x2 *r, const fe1305x2 *x,
                                      const fe1305x2 *y, const fe1305x2 *c);

// openssl_poly1305_neon2_blocks processes `inlen` bytes from `in` and updates
// the hash state in `h` using the precomputed powers in `precomp`. It returns
// the number of bytes that were not processed (i.e. the remainder < 32 bytes).
int openssl_poly1305_neon2_blocks(fe1305x2 *h, const fe1305x2 precomp[2],
                                  const uint8_t *in, size_t inlen);
}

void CRYPTO_poly1305_init_neon(poly1305_state *state, const uint8_t key[32]);

void CRYPTO_poly1305_update_neon(poly1305_state *state, const uint8_t *in,
                                 size_t in_len);

void CRYPTO_poly1305_finish_neon(poly1305_state *state, uint8_t mac[16]);
#endif

BSSL_NAMESPACE_END

#endif  // OPENSSL_HEADER_CRYPTO_POLY1305_INTERNAL_H