chromium/third_party/boringssl/src/crypto/fipsmodule/bn/gcd_extra.c.inc

/* Copyright (c) 2018, 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/bn.h>

#include <assert.h>

#include <openssl/err.h>

#include "internal.h"


static BN_ULONG word_is_odd_mask(BN_ULONG a) { … }

static void maybe_rshift1_words(BN_ULONG *a, BN_ULONG mask, BN_ULONG *tmp,
                                size_t num) { … }

static void maybe_rshift1_words_carry(BN_ULONG *a, BN_ULONG carry,
                                      BN_ULONG mask, BN_ULONG *tmp,
                                      size_t num) { … }

static BN_ULONG maybe_add_words(BN_ULONG *a, BN_ULONG mask, const BN_ULONG *b,
                                BN_ULONG *tmp, size_t num) { … }

static int bn_gcd_consttime(BIGNUM *r, unsigned *out_shift, const BIGNUM *x,
                            const BIGNUM *y, BN_CTX *ctx) { … }

int BN_gcd(BIGNUM *r, const BIGNUM *x, const BIGNUM *y, BN_CTX *ctx) { … }

int bn_is_relatively_prime(int *out_relatively_prime, const BIGNUM *x,
                           const BIGNUM *y, BN_CTX *ctx) { … }

int bn_lcm_consttime(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx) { … }

int bn_mod_inverse_consttime(BIGNUM *r, int *out_no_inverse, const BIGNUM *a,
                             const BIGNUM *n, BN_CTX *ctx) { … }