chromium/third_party/boringssl/src/crypto/fipsmodule/modes/polyval.c.inc

/* Copyright (c) 2016, 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. */

#include <openssl/base.h>

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

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


// byte_reverse reverses the order of the bytes in |b->c|.
static void byte_reverse(uint8_t b[16]) { … }

// reverse_and_mulX_ghash interprets |b| as a reversed element of the GHASH
// field, multiplies that by 'x' and serialises the result back into |b|, but
// with GHASH's backwards bit ordering.
static void reverse_and_mulX_ghash(uint8_t b[16]) { … }

// POLYVAL(H, X_1, ..., X_n) =
// ByteReverse(GHASH(mulX_GHASH(ByteReverse(H)), ByteReverse(X_1), ...,
// ByteReverse(X_n))).
//
// See https://www.rfc-editor.org/rfc/rfc8452.html#appendix-A.

void CRYPTO_POLYVAL_init(struct polyval_ctx *ctx, const uint8_t key[16]) { … }

void CRYPTO_POLYVAL_update_blocks(struct polyval_ctx *ctx, const uint8_t *in,
                                  size_t in_len) { … }

void CRYPTO_POLYVAL_finish(const struct polyval_ctx *ctx, uint8_t out[16]) { … }