399 lines
9.7 KiB
C
Executable File
399 lines
9.7 KiB
C
Executable File
/* $OpenBSD: gostr341001.c,v 1.7 2017/01/29 17:49:23 beck Exp $ */
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/*
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* Copyright (c) 2014 Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
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* Copyright (c) 2005-2006 Cryptocom LTD
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*/
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#include <string.h>
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#include <openssl/opensslconf.h>
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#ifndef OPENSSL_NO_GOST
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#include <openssl/bn.h>
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#include <openssl/err.h>
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#include <openssl/gost.h>
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#include "bn_lcl.h"
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#include "gost_locl.h"
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/* Convert little-endian byte array into bignum */
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BIGNUM *
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GOST_le2bn(const unsigned char *buf, size_t len, BIGNUM *bn)
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{
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unsigned char temp[64];
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int i;
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if (len > 64)
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return NULL;
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for (i = 0; i < len; i++) {
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temp[len - 1 - i] = buf[i];
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}
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return BN_bin2bn(temp, len, bn);
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}
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int
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GOST_bn2le(BIGNUM *bn, unsigned char *buf, int len)
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{
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unsigned char temp[64];
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int i, bytes;
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bytes = BN_num_bytes(bn);
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if (len > 64 || bytes > len)
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return 0;
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BN_bn2bin(bn, temp);
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for (i = 0; i < bytes; i++) {
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buf[bytes - 1 - i] = temp[i];
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}
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memset(buf + bytes, 0, len - bytes);
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return 1;
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}
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int
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gost2001_compute_public(GOST_KEY *ec)
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{
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const EC_GROUP *group = GOST_KEY_get0_group(ec);
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EC_POINT *pub_key = NULL;
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const BIGNUM *priv_key = NULL;
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BN_CTX *ctx = NULL;
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int ok = 0;
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if (group == NULL) {
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GOSTerror(GOST_R_KEY_IS_NOT_INITIALIZED);
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return 0;
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}
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ctx = BN_CTX_new();
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if (ctx == NULL) {
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GOSTerror(ERR_R_MALLOC_FAILURE);
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return 0;
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}
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BN_CTX_start(ctx);
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if ((priv_key = GOST_KEY_get0_private_key(ec)) == NULL)
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goto err;
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pub_key = EC_POINT_new(group);
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if (pub_key == NULL)
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goto err;
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if (EC_POINT_mul(group, pub_key, priv_key, NULL, NULL, ctx) == 0)
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goto err;
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if (GOST_KEY_set_public_key(ec, pub_key) == 0)
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goto err;
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ok = 1;
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if (ok == 0) {
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err:
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GOSTerror(ERR_R_EC_LIB);
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}
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EC_POINT_free(pub_key);
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if (ctx != NULL) {
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BN_CTX_end(ctx);
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BN_CTX_free(ctx);
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}
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return ok;
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}
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ECDSA_SIG *
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gost2001_do_sign(BIGNUM *md, GOST_KEY *eckey)
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{
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ECDSA_SIG *newsig = NULL;
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BIGNUM *order = NULL;
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const EC_GROUP *group;
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const BIGNUM *priv_key;
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BIGNUM *r = NULL, *s = NULL, *X = NULL, *tmp = NULL, *tmp2 = NULL, *k =
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NULL, *e = NULL;
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EC_POINT *C = NULL;
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BN_CTX *ctx = BN_CTX_new();
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int ok = 0;
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if (ctx == NULL) {
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GOSTerror(ERR_R_MALLOC_FAILURE);
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return NULL;
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}
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BN_CTX_start(ctx);
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newsig = ECDSA_SIG_new();
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if (newsig == NULL) {
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GOSTerror(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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s = newsig->s;
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r = newsig->r;
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group = GOST_KEY_get0_group(eckey);
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if ((order = BN_CTX_get(ctx)) == NULL)
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goto err;
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if (EC_GROUP_get_order(group, order, ctx) == 0)
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goto err;
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priv_key = GOST_KEY_get0_private_key(eckey);
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if ((e = BN_CTX_get(ctx)) == NULL)
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goto err;
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if (BN_mod_ct(e, md, order, ctx) == 0)
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goto err;
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if (BN_is_zero(e))
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BN_one(e);
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if ((k = BN_CTX_get(ctx)) == NULL)
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goto err;
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if ((X = BN_CTX_get(ctx)) == NULL)
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goto err;
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if ((C = EC_POINT_new(group)) == NULL)
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goto err;
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do {
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do {
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if (!BN_rand_range(k, order)) {
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GOSTerror(GOST_R_RANDOM_NUMBER_GENERATOR_FAILED);
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goto err;
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}
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/*
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* We do not want timing information to leak the length
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* of k, so we compute G*k using an equivalent scalar
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* of fixed bit-length.
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*/
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if (BN_add(k, k, order) == 0)
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goto err;
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if (BN_num_bits(k) <= BN_num_bits(order))
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if (BN_add(k, k, order) == 0)
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goto err;
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if (EC_POINT_mul(group, C, k, NULL, NULL, ctx) == 0) {
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GOSTerror(ERR_R_EC_LIB);
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goto err;
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}
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if (EC_POINT_get_affine_coordinates_GFp(group, C, X,
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NULL, ctx) == 0) {
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GOSTerror(ERR_R_EC_LIB);
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goto err;
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}
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if (BN_nnmod(r, X, order, ctx) == 0)
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goto err;
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} while (BN_is_zero(r));
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/* s = (r*priv_key+k*e) mod order */
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if (tmp == NULL) {
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if ((tmp = BN_CTX_get(ctx)) == NULL)
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goto err;
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}
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if (BN_mod_mul(tmp, priv_key, r, order, ctx) == 0)
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goto err;
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if (tmp2 == NULL) {
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if ((tmp2 = BN_CTX_get(ctx)) == NULL)
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goto err;
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}
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if (BN_mod_mul(tmp2, k, e, order, ctx) == 0)
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goto err;
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if (BN_mod_add(s, tmp, tmp2, order, ctx) == 0)
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goto err;
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} while (BN_is_zero(s));
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ok = 1;
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err:
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EC_POINT_free(C);
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if (ctx != NULL) {
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BN_CTX_end(ctx);
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BN_CTX_free(ctx);
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}
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if (ok == 0) {
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ECDSA_SIG_free(newsig);
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newsig = NULL;
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}
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return newsig;
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}
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int
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gost2001_do_verify(BIGNUM *md, ECDSA_SIG *sig, GOST_KEY *ec)
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{
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BN_CTX *ctx = BN_CTX_new();
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const EC_GROUP *group = GOST_KEY_get0_group(ec);
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BIGNUM *order;
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BIGNUM *e = NULL, *R = NULL, *v = NULL, *z1 = NULL, *z2 = NULL;
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BIGNUM *X = NULL, *tmp = NULL;
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EC_POINT *C = NULL;
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const EC_POINT *pub_key = NULL;
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int ok = 0;
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if (ctx == NULL)
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goto err;
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BN_CTX_start(ctx);
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if ((order = BN_CTX_get(ctx)) == NULL)
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goto err;
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if ((e = BN_CTX_get(ctx)) == NULL)
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goto err;
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if ((z1 = BN_CTX_get(ctx)) == NULL)
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goto err;
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if ((z2 = BN_CTX_get(ctx)) == NULL)
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goto err;
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if ((tmp = BN_CTX_get(ctx)) == NULL)
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goto err;
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if ((X = BN_CTX_get(ctx)) == NULL)
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goto err;
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if ((R = BN_CTX_get(ctx)) == NULL)
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goto err;
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if ((v = BN_CTX_get(ctx)) == NULL)
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goto err;
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if (EC_GROUP_get_order(group, order, ctx) == 0)
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goto err;
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pub_key = GOST_KEY_get0_public_key(ec);
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if (BN_is_zero(sig->s) || BN_is_zero(sig->r) ||
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BN_cmp(sig->s, order) >= 1 || BN_cmp(sig->r, order) >= 1) {
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GOSTerror(GOST_R_SIGNATURE_PARTS_GREATER_THAN_Q);
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goto err;
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}
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if (BN_mod_ct(e, md, order, ctx) == 0)
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goto err;
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if (BN_is_zero(e))
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BN_one(e);
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if ((v = BN_mod_inverse_ct(v, e, order, ctx)) == NULL)
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goto err;
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if (BN_mod_mul(z1, sig->s, v, order, ctx) == 0)
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goto err;
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if (BN_sub(tmp, order, sig->r) == 0)
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goto err;
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if (BN_mod_mul(z2, tmp, v, order, ctx) == 0)
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goto err;
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if ((C = EC_POINT_new(group)) == NULL)
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goto err;
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if (EC_POINT_mul(group, C, z1, pub_key, z2, ctx) == 0) {
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GOSTerror(ERR_R_EC_LIB);
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goto err;
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}
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if (EC_POINT_get_affine_coordinates_GFp(group, C, X, NULL, ctx) == 0) {
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GOSTerror(ERR_R_EC_LIB);
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goto err;
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}
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if (BN_mod_ct(R, X, order, ctx) == 0)
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goto err;
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if (BN_cmp(R, sig->r) != 0) {
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GOSTerror(GOST_R_SIGNATURE_MISMATCH);
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} else {
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ok = 1;
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}
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err:
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EC_POINT_free(C);
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if (ctx != NULL) {
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BN_CTX_end(ctx);
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BN_CTX_free(ctx);
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}
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return ok;
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}
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/* Implementation of CryptoPro VKO 34.10-2001 algorithm */
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int
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VKO_compute_key(BIGNUM *X, BIGNUM *Y, const GOST_KEY *pkey, GOST_KEY *priv_key,
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const BIGNUM *ukm)
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{
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BIGNUM *p = NULL, *order = NULL;
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const BIGNUM *key = GOST_KEY_get0_private_key(priv_key);
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const EC_GROUP *group = GOST_KEY_get0_group(priv_key);
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const EC_POINT *pub_key = GOST_KEY_get0_public_key(pkey);
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EC_POINT *pnt;
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BN_CTX *ctx = NULL;
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int ok = 0;
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pnt = EC_POINT_new(group);
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if (pnt == NULL)
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goto err;
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ctx = BN_CTX_new();
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if (ctx == NULL)
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goto err;
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BN_CTX_start(ctx);
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if ((p = BN_CTX_get(ctx)) == NULL)
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goto err;
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if ((order = BN_CTX_get(ctx)) == NULL)
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goto err;
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if (EC_GROUP_get_order(group, order, ctx) == 0)
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goto err;
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if (BN_mod_mul(p, key, ukm, order, ctx) == 0)
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goto err;
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if (EC_POINT_mul(group, pnt, NULL, pub_key, p, ctx) == 0)
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goto err;
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if (EC_POINT_get_affine_coordinates_GFp(group, pnt, X, Y, ctx) == 0)
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goto err;
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ok = 1;
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err:
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if (ctx != NULL) {
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BN_CTX_end(ctx);
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BN_CTX_free(ctx);
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}
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EC_POINT_free(pnt);
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return ok;
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}
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int
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gost2001_keygen(GOST_KEY *ec)
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{
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BIGNUM *order = BN_new(), *d = BN_new();
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const EC_GROUP *group = GOST_KEY_get0_group(ec);
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int rc = 0;
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if (order == NULL || d == NULL)
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goto err;
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if (EC_GROUP_get_order(group, order, NULL) == 0)
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goto err;
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do {
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if (BN_rand_range(d, order) == 0) {
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GOSTerror(GOST_R_RANDOM_NUMBER_GENERATOR_FAILED);
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goto err;
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}
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} while (BN_is_zero(d));
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if (GOST_KEY_set_private_key(ec, d) == 0)
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goto err;
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rc = gost2001_compute_public(ec);
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err:
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BN_free(d);
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BN_free(order);
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return rc;
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}
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#endif
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