diff options
Diffstat (limited to 'thirdparty/openssl/crypto/bn/bn_mont.c')
| -rw-r--r-- | thirdparty/openssl/crypto/bn/bn_mont.c | 561 |
1 files changed, 0 insertions, 561 deletions
diff --git a/thirdparty/openssl/crypto/bn/bn_mont.c b/thirdparty/openssl/crypto/bn/bn_mont.c deleted file mode 100644 index 3af9db870b..0000000000 --- a/thirdparty/openssl/crypto/bn/bn_mont.c +++ /dev/null @@ -1,561 +0,0 @@ -/* crypto/bn/bn_mont.c */ -/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) - * All rights reserved. - * - * This package is an SSL implementation written - * by Eric Young (eay@cryptsoft.com). - * The implementation was written so as to conform with Netscapes SSL. - * - * This library is free for commercial and non-commercial use as long as - * the following conditions are aheared to. The following conditions - * apply to all code found in this distribution, be it the RC4, RSA, - * lhash, DES, etc., code; not just the SSL code. The SSL documentation - * included with this distribution is covered by the same copyright terms - * except that the holder is Tim Hudson (tjh@cryptsoft.com). - * - * Copyright remains Eric Young's, and as such any Copyright notices in - * the code are not to be removed. - * If this package is used in a product, Eric Young should be given attribution - * as the author of the parts of the library used. - * This can be in the form of a textual message at program startup or - * in documentation (online or textual) provided with the package. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * "This product includes cryptographic software written by - * Eric Young (eay@cryptsoft.com)" - * The word 'cryptographic' can be left out if the rouines from the library - * being used are not cryptographic related :-). - * 4. If you include any Windows specific code (or a derivative thereof) from - * the apps directory (application code) you must include an acknowledgement: - * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" - * - * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * The licence and distribution terms for any publically available version or - * derivative of this code cannot be changed. i.e. this code cannot simply be - * copied and put under another distribution licence - * [including the GNU Public Licence.] - */ -/* ==================================================================== - * Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in - * the documentation and/or other materials provided with the - * distribution. - * - * 3. All advertising materials mentioning features or use of this - * software must display the following acknowledgment: - * "This product includes software developed by the OpenSSL Project - * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" - * - * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to - * endorse or promote products derived from this software without - * prior written permission. For written permission, please contact - * openssl-core@openssl.org. - * - * 5. Products derived from this software may not be called "OpenSSL" - * nor may "OpenSSL" appear in their names without prior written - * permission of the OpenSSL Project. - * - * 6. Redistributions of any form whatsoever must retain the following - * acknowledgment: - * "This product includes software developed by the OpenSSL Project - * for use in the OpenSSL Toolkit (http://www.openssl.org/)" - * - * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY - * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR - * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR - * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT - * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; - * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, - * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) - * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED - * OF THE POSSIBILITY OF SUCH DAMAGE. - * ==================================================================== - * - * This product includes cryptographic software written by Eric Young - * (eay@cryptsoft.com). This product includes software written by Tim - * Hudson (tjh@cryptsoft.com). - * - */ - -/* - * Details about Montgomery multiplication algorithms can be found at - * http://security.ece.orst.edu/publications.html, e.g. - * http://security.ece.orst.edu/koc/papers/j37acmon.pdf and - * sections 3.8 and 4.2 in http://security.ece.orst.edu/koc/papers/r01rsasw.pdf - */ - -#include <stdio.h> -#include "cryptlib.h" -#include "bn_lcl.h" - -#define MONT_WORD /* use the faster word-based algorithm */ - -#ifdef MONT_WORD -static int BN_from_montgomery_word(BIGNUM *ret, BIGNUM *r, BN_MONT_CTX *mont); -#endif - -int BN_mod_mul_montgomery(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, - BN_MONT_CTX *mont, BN_CTX *ctx) -{ - BIGNUM *tmp; - int ret = 0; -#if defined(OPENSSL_BN_ASM_MONT) && defined(MONT_WORD) - int num = mont->N.top; - - if (num > 1 && a->top == num && b->top == num) { - if (bn_wexpand(r, num) == NULL) - return (0); - if (bn_mul_mont(r->d, a->d, b->d, mont->N.d, mont->n0, num)) { - r->neg = a->neg ^ b->neg; - r->top = num; - bn_correct_top(r); - return (1); - } - } -#endif - - BN_CTX_start(ctx); - tmp = BN_CTX_get(ctx); - if (tmp == NULL) - goto err; - - bn_check_top(tmp); - if (a == b) { - if (!BN_sqr(tmp, a, ctx)) - goto err; - } else { - if (!BN_mul(tmp, a, b, ctx)) - goto err; - } - /* reduce from aRR to aR */ -#ifdef MONT_WORD - if (!BN_from_montgomery_word(r, tmp, mont)) - goto err; -#else - if (!BN_from_montgomery(r, tmp, mont, ctx)) - goto err; -#endif - bn_check_top(r); - ret = 1; - err: - BN_CTX_end(ctx); - return (ret); -} - -#ifdef MONT_WORD -static int BN_from_montgomery_word(BIGNUM *ret, BIGNUM *r, BN_MONT_CTX *mont) -{ - BIGNUM *n; - BN_ULONG *ap, *np, *rp, n0, v, carry; - int nl, max, i; - - n = &(mont->N); - nl = n->top; - if (nl == 0) { - ret->top = 0; - return (1); - } - - max = (2 * nl); /* carry is stored separately */ - if (bn_wexpand(r, max) == NULL) - return (0); - - r->neg ^= n->neg; - np = n->d; - rp = r->d; - - /* clear the top words of T */ -# if 1 - for (i = r->top; i < max; i++) /* memset? XXX */ - rp[i] = 0; -# else - memset(&(rp[r->top]), 0, (max - r->top) * sizeof(BN_ULONG)); -# endif - - r->top = max; - n0 = mont->n0[0]; - -# ifdef BN_COUNT - fprintf(stderr, "word BN_from_montgomery_word %d * %d\n", nl, nl); -# endif - for (carry = 0, i = 0; i < nl; i++, rp++) { -# ifdef __TANDEM - { - long long t1; - long long t2; - long long t3; - t1 = rp[0] * (n0 & 0177777); - t2 = 037777600000l; - t2 = n0 & t2; - t3 = rp[0] & 0177777; - t2 = (t3 * t2) & BN_MASK2; - t1 = t1 + t2; - v = bn_mul_add_words(rp, np, nl, (BN_ULONG)t1); - } -# else - v = bn_mul_add_words(rp, np, nl, (rp[0] * n0) & BN_MASK2); -# endif - v = (v + carry + rp[nl]) & BN_MASK2; - carry |= (v != rp[nl]); - carry &= (v <= rp[nl]); - rp[nl] = v; - } - - if (bn_wexpand(ret, nl) == NULL) - return (0); - ret->top = nl; - ret->neg = r->neg; - - rp = ret->d; - ap = &(r->d[nl]); - -# define BRANCH_FREE 1 -# if BRANCH_FREE - { - BN_ULONG *nrp; - size_t m; - - v = bn_sub_words(rp, ap, np, nl) - carry; - /* - * if subtraction result is real, then trick unconditional memcpy - * below to perform in-place "refresh" instead of actual copy. - */ - m = (0 - (size_t)v); - nrp = - (BN_ULONG *)(((PTR_SIZE_INT) rp & ~m) | ((PTR_SIZE_INT) ap & m)); - - for (i = 0, nl -= 4; i < nl; i += 4) { - BN_ULONG t1, t2, t3, t4; - - t1 = nrp[i + 0]; - t2 = nrp[i + 1]; - t3 = nrp[i + 2]; - ap[i + 0] = 0; - t4 = nrp[i + 3]; - ap[i + 1] = 0; - rp[i + 0] = t1; - ap[i + 2] = 0; - rp[i + 1] = t2; - ap[i + 3] = 0; - rp[i + 2] = t3; - rp[i + 3] = t4; - } - for (nl += 4; i < nl; i++) - rp[i] = nrp[i], ap[i] = 0; - } -# else - if (bn_sub_words(rp, ap, np, nl) - carry) - memcpy(rp, ap, nl * sizeof(BN_ULONG)); -# endif - bn_correct_top(r); - bn_correct_top(ret); - bn_check_top(ret); - - return (1); -} -#endif /* MONT_WORD */ - -int BN_from_montgomery(BIGNUM *ret, const BIGNUM *a, BN_MONT_CTX *mont, - BN_CTX *ctx) -{ - int retn = 0; -#ifdef MONT_WORD - BIGNUM *t; - - BN_CTX_start(ctx); - if ((t = BN_CTX_get(ctx)) && BN_copy(t, a)) - retn = BN_from_montgomery_word(ret, t, mont); - BN_CTX_end(ctx); -#else /* !MONT_WORD */ - BIGNUM *t1, *t2; - - BN_CTX_start(ctx); - t1 = BN_CTX_get(ctx); - t2 = BN_CTX_get(ctx); - if (t1 == NULL || t2 == NULL) - goto err; - - if (!BN_copy(t1, a)) - goto err; - BN_mask_bits(t1, mont->ri); - - if (!BN_mul(t2, t1, &mont->Ni, ctx)) - goto err; - BN_mask_bits(t2, mont->ri); - - if (!BN_mul(t1, t2, &mont->N, ctx)) - goto err; - if (!BN_add(t2, a, t1)) - goto err; - if (!BN_rshift(ret, t2, mont->ri)) - goto err; - - if (BN_ucmp(ret, &(mont->N)) >= 0) { - if (!BN_usub(ret, ret, &(mont->N))) - goto err; - } - retn = 1; - bn_check_top(ret); - err: - BN_CTX_end(ctx); -#endif /* MONT_WORD */ - return (retn); -} - -BN_MONT_CTX *BN_MONT_CTX_new(void) -{ - BN_MONT_CTX *ret; - - if ((ret = (BN_MONT_CTX *)OPENSSL_malloc(sizeof(BN_MONT_CTX))) == NULL) - return (NULL); - - BN_MONT_CTX_init(ret); - ret->flags = BN_FLG_MALLOCED; - return (ret); -} - -void BN_MONT_CTX_init(BN_MONT_CTX *ctx) -{ - ctx->ri = 0; - BN_init(&(ctx->RR)); - BN_init(&(ctx->N)); - BN_init(&(ctx->Ni)); - ctx->n0[0] = ctx->n0[1] = 0; - ctx->flags = 0; -} - -void BN_MONT_CTX_free(BN_MONT_CTX *mont) -{ - if (mont == NULL) - return; - - BN_clear_free(&(mont->RR)); - BN_clear_free(&(mont->N)); - BN_clear_free(&(mont->Ni)); - if (mont->flags & BN_FLG_MALLOCED) - OPENSSL_free(mont); -} - -int BN_MONT_CTX_set(BN_MONT_CTX *mont, const BIGNUM *mod, BN_CTX *ctx) -{ - int ret = 0; - BIGNUM *Ri, *R; - - if (BN_is_zero(mod)) - return 0; - - BN_CTX_start(ctx); - if ((Ri = BN_CTX_get(ctx)) == NULL) - goto err; - R = &(mont->RR); /* grab RR as a temp */ - if (!BN_copy(&(mont->N), mod)) - goto err; /* Set N */ - mont->N.neg = 0; - -#ifdef MONT_WORD - { - BIGNUM tmod; - BN_ULONG buf[2]; - - BN_init(&tmod); - tmod.d = buf; - tmod.dmax = 2; - tmod.neg = 0; - - if (BN_get_flags(mod, BN_FLG_CONSTTIME) != 0) - BN_set_flags(&tmod, BN_FLG_CONSTTIME); - - mont->ri = (BN_num_bits(mod) + (BN_BITS2 - 1)) / BN_BITS2 * BN_BITS2; - -# if defined(OPENSSL_BN_ASM_MONT) && (BN_BITS2<=32) - /* - * Only certain BN_BITS2<=32 platforms actually make use of n0[1], - * and we could use the #else case (with a shorter R value) for the - * others. However, currently only the assembler files do know which - * is which. - */ - - BN_zero(R); - if (!(BN_set_bit(R, 2 * BN_BITS2))) - goto err; - - tmod.top = 0; - if ((buf[0] = mod->d[0])) - tmod.top = 1; - if ((buf[1] = mod->top > 1 ? mod->d[1] : 0)) - tmod.top = 2; - - if ((BN_mod_inverse(Ri, R, &tmod, ctx)) == NULL) - goto err; - if (!BN_lshift(Ri, Ri, 2 * BN_BITS2)) - goto err; /* R*Ri */ - if (!BN_is_zero(Ri)) { - if (!BN_sub_word(Ri, 1)) - goto err; - } else { /* if N mod word size == 1 */ - - if (bn_expand(Ri, (int)sizeof(BN_ULONG) * 2) == NULL) - goto err; - /* Ri-- (mod double word size) */ - Ri->neg = 0; - Ri->d[0] = BN_MASK2; - Ri->d[1] = BN_MASK2; - Ri->top = 2; - } - if (!BN_div(Ri, NULL, Ri, &tmod, ctx)) - goto err; - /* - * Ni = (R*Ri-1)/N, keep only couple of least significant words: - */ - mont->n0[0] = (Ri->top > 0) ? Ri->d[0] : 0; - mont->n0[1] = (Ri->top > 1) ? Ri->d[1] : 0; -# else - BN_zero(R); - if (!(BN_set_bit(R, BN_BITS2))) - goto err; /* R */ - - buf[0] = mod->d[0]; /* tmod = N mod word size */ - buf[1] = 0; - tmod.top = buf[0] != 0 ? 1 : 0; - /* Ri = R^-1 mod N */ - if ((BN_mod_inverse(Ri, R, &tmod, ctx)) == NULL) - goto err; - if (!BN_lshift(Ri, Ri, BN_BITS2)) - goto err; /* R*Ri */ - if (!BN_is_zero(Ri)) { - if (!BN_sub_word(Ri, 1)) - goto err; - } else { /* if N mod word size == 1 */ - - if (!BN_set_word(Ri, BN_MASK2)) - goto err; /* Ri-- (mod word size) */ - } - if (!BN_div(Ri, NULL, Ri, &tmod, ctx)) - goto err; - /* - * Ni = (R*Ri-1)/N, keep only least significant word: - */ - mont->n0[0] = (Ri->top > 0) ? Ri->d[0] : 0; - mont->n0[1] = 0; -# endif - } -#else /* !MONT_WORD */ - { /* bignum version */ - mont->ri = BN_num_bits(&mont->N); - BN_zero(R); - if (!BN_set_bit(R, mont->ri)) - goto err; /* R = 2^ri */ - /* Ri = R^-1 mod N */ - if ((BN_mod_inverse(Ri, R, &mont->N, ctx)) == NULL) - goto err; - if (!BN_lshift(Ri, Ri, mont->ri)) - goto err; /* R*Ri */ - if (!BN_sub_word(Ri, 1)) - goto err; - /* - * Ni = (R*Ri-1) / N - */ - if (!BN_div(&(mont->Ni), NULL, Ri, &mont->N, ctx)) - goto err; - } -#endif - - /* setup RR for conversions */ - BN_zero(&(mont->RR)); - if (!BN_set_bit(&(mont->RR), mont->ri * 2)) - goto err; - if (!BN_mod(&(mont->RR), &(mont->RR), &(mont->N), ctx)) - goto err; - - ret = 1; - err: - BN_CTX_end(ctx); - return ret; -} - -BN_MONT_CTX *BN_MONT_CTX_copy(BN_MONT_CTX *to, BN_MONT_CTX *from) -{ - if (to == from) - return (to); - - if (!BN_copy(&(to->RR), &(from->RR))) - return NULL; - if (!BN_copy(&(to->N), &(from->N))) - return NULL; - if (!BN_copy(&(to->Ni), &(from->Ni))) - return NULL; - to->ri = from->ri; - to->n0[0] = from->n0[0]; - to->n0[1] = from->n0[1]; - return (to); -} - -BN_MONT_CTX *BN_MONT_CTX_set_locked(BN_MONT_CTX **pmont, int lock, - const BIGNUM *mod, BN_CTX *ctx) -{ - BN_MONT_CTX *ret; - - CRYPTO_r_lock(lock); - ret = *pmont; - CRYPTO_r_unlock(lock); - if (ret) - return ret; - - /* - * We don't want to serialise globally while doing our lazy-init math in - * BN_MONT_CTX_set. That punishes threads that are doing independent - * things. Instead, punish the case where more than one thread tries to - * lazy-init the same 'pmont', by having each do the lazy-init math work - * independently and only use the one from the thread that wins the race - * (the losers throw away the work they've done). - */ - ret = BN_MONT_CTX_new(); - if (!ret) - return NULL; - if (!BN_MONT_CTX_set(ret, mod, ctx)) { - BN_MONT_CTX_free(ret); - return NULL; - } - - /* The locked compare-and-set, after the local work is done. */ - CRYPTO_w_lock(lock); - if (*pmont) { - BN_MONT_CTX_free(ret); - ret = *pmont; - } else - *pmont = ret; - CRYPTO_w_unlock(lock); - return ret; -} |