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567 lines
15 KiB
C
567 lines
15 KiB
C
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/* $OpenBSD: ecs_ossl.c,v 1.20 2019/06/04 18:15:27 tb Exp $ */
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/*
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* Written by Nils Larsch for the OpenSSL project
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*/
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/* ====================================================================
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* Copyright (c) 1998-2004 The OpenSSL Project. All rights reserved.
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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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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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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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#include <openssl/err.h>
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#include <openssl/obj_mac.h>
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#include <openssl/bn.h>
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#include "bn_lcl.h"
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#include "ecs_locl.h"
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static int ecdsa_prepare_digest(const unsigned char *dgst, int dgst_len,
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BIGNUM *order, BIGNUM *ret);
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static ECDSA_SIG *ecdsa_do_sign(const unsigned char *dgst, int dgst_len,
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const BIGNUM *, const BIGNUM *, EC_KEY *eckey);
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static int ecdsa_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp,
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BIGNUM **rp);
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static int ecdsa_do_verify(const unsigned char *dgst, int dgst_len,
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const ECDSA_SIG *sig, EC_KEY *eckey);
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static ECDSA_METHOD openssl_ecdsa_meth = {
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.name = "OpenSSL ECDSA method",
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.ecdsa_do_sign = ecdsa_do_sign,
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.ecdsa_sign_setup = ecdsa_sign_setup,
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.ecdsa_do_verify = ecdsa_do_verify
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};
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const ECDSA_METHOD *
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ECDSA_OpenSSL(void)
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{
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return &openssl_ecdsa_meth;
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}
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static int
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ecdsa_prepare_digest(const unsigned char *dgst, int dgst_len, BIGNUM *order,
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BIGNUM *ret)
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{
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int dgst_bits, order_bits;
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if (!BN_bin2bn(dgst, dgst_len, ret)) {
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ECDSAerror(ERR_R_BN_LIB);
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return 0;
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}
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/* FIPS 186-3 6.4: Use order_bits leftmost bits if digest is too long */
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dgst_bits = 8 * dgst_len;
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order_bits = BN_num_bits(order);
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if (dgst_bits > order_bits) {
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if (!BN_rshift(ret, ret, dgst_bits - order_bits)) {
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ECDSAerror(ERR_R_BN_LIB);
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return 0;
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}
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}
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return 1;
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}
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int
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ossl_ecdsa_sign(int type, const unsigned char *dgst, int dlen, unsigned char *sig,
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unsigned int *siglen, const BIGNUM *kinv, const BIGNUM *r, EC_KEY *eckey)
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{
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ECDSA_SIG *s;
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if ((s = ECDSA_do_sign_ex(dgst, dlen, kinv, r, eckey)) == NULL) {
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*siglen = 0;
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return 0;
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}
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*siglen = i2d_ECDSA_SIG(s, &sig);
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ECDSA_SIG_free(s);
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return 1;
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}
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static int
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ecdsa_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp)
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{
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BN_CTX *ctx = ctx_in;
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BIGNUM *k = NULL, *r = NULL, *order = NULL, *X = NULL;
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EC_POINT *point = NULL;
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const EC_GROUP *group;
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int order_bits, ret = 0;
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if (eckey == NULL || (group = EC_KEY_get0_group(eckey)) == NULL) {
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ECDSAerror(ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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if (ctx == NULL) {
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if ((ctx = BN_CTX_new()) == NULL) {
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ECDSAerror(ERR_R_MALLOC_FAILURE);
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return 0;
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}
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}
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if ((k = BN_new()) == NULL || (r = BN_new()) == NULL ||
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(order = BN_new()) == NULL || (X = BN_new()) == NULL) {
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ECDSAerror(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if ((point = EC_POINT_new(group)) == NULL) {
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ECDSAerror(ERR_R_EC_LIB);
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goto err;
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}
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if (!EC_GROUP_get_order(group, order, ctx)) {
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ECDSAerror(ERR_R_EC_LIB);
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goto err;
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}
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/* Preallocate space. */
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order_bits = BN_num_bits(order);
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if (!BN_set_bit(k, order_bits) ||
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!BN_set_bit(r, order_bits) ||
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!BN_set_bit(X, order_bits))
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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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ECDSAerror(
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ECDSA_R_RANDOM_NUMBER_GENERATION_FAILED);
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goto err;
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}
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} while (BN_is_zero(k));
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/*
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* We do not want timing information to leak the length of k,
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* so we compute G * k using an equivalent scalar of fixed
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* bit-length.
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*
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* We unconditionally perform both of these additions to prevent
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* a small timing information leakage. We then choose the sum
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* that is one bit longer than the order. This guarantees the
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* code path used in the constant time implementations
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* elsewhere.
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*
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* TODO: revisit the BN_copy aiming for a memory access agnostic
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* conditional copy.
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*/
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if (!BN_add(r, k, order) ||
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!BN_add(X, r, order) ||
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!BN_copy(k, BN_num_bits(r) > order_bits ? r : X))
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goto err;
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BN_set_flags(k, BN_FLG_CONSTTIME);
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/* Compute r, the x-coordinate of G * k. */
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if (!EC_POINT_mul(group, point, k, NULL, NULL, ctx)) {
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ECDSAerror(ERR_R_EC_LIB);
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goto err;
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}
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if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) ==
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NID_X9_62_prime_field) {
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if (!EC_POINT_get_affine_coordinates_GFp(group, point,
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X, NULL, ctx)) {
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ECDSAerror(ERR_R_EC_LIB);
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goto err;
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}
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}
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#ifndef OPENSSL_NO_EC2M
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else { /* NID_X9_62_characteristic_two_field */
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if (!EC_POINT_get_affine_coordinates_GF2m(group, point,
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X, NULL, ctx)) {
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ECDSAerror(ERR_R_EC_LIB);
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goto err;
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}
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}
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#endif
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if (!BN_nnmod(r, X, order, ctx)) {
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ECDSAerror(ERR_R_BN_LIB);
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goto err;
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}
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} while (BN_is_zero(r));
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if (!BN_mod_inverse_ct(k, k, order, ctx)) {
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ECDSAerror(ERR_R_BN_LIB);
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goto err;
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}
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BN_clear_free(*rp);
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BN_clear_free(*kinvp);
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*rp = r;
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*kinvp = k;
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ret = 1;
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err:
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if (ret == 0) {
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BN_clear_free(k);
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BN_clear_free(r);
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}
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if (ctx_in == NULL)
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BN_CTX_free(ctx);
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BN_free(order);
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EC_POINT_free(point);
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BN_clear_free(X);
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return (ret);
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}
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/* replace w/ ecdsa_sign_setup() when ECDSA_METHOD gets removed */
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int
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ossl_ecdsa_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp)
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{
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ECDSA_DATA *ecdsa;
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if ((ecdsa = ecdsa_check(eckey)) == NULL)
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return 0;
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return ecdsa->meth->ecdsa_sign_setup(eckey, ctx_in, kinvp, rp);
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}
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static ECDSA_SIG *
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ecdsa_do_sign(const unsigned char *dgst, int dgst_len,
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const BIGNUM *in_kinv, const BIGNUM *in_r, EC_KEY *eckey)
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{
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BIGNUM *b = NULL, *binv = NULL, *bm = NULL, *bxr = NULL;
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BIGNUM *kinv = NULL, *m = NULL, *order = NULL, *range = NULL, *s;
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const BIGNUM *ckinv, *priv_key;
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BN_CTX *ctx = NULL;
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const EC_GROUP *group;
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ECDSA_SIG *ret;
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ECDSA_DATA *ecdsa;
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int ok = 0;
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ecdsa = ecdsa_check(eckey);
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group = EC_KEY_get0_group(eckey);
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priv_key = EC_KEY_get0_private_key(eckey);
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if (group == NULL || priv_key == NULL || ecdsa == NULL) {
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ECDSAerror(ERR_R_PASSED_NULL_PARAMETER);
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return NULL;
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}
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if ((ret = ECDSA_SIG_new()) == NULL) {
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ECDSAerror(ERR_R_MALLOC_FAILURE);
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return NULL;
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}
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s = ret->s;
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if ((ctx = BN_CTX_new()) == NULL || (order = BN_new()) == NULL ||
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(range = BN_new()) == NULL || (b = BN_new()) == NULL ||
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(binv = BN_new()) == NULL || (bm = BN_new()) == NULL ||
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(bxr = BN_new()) == NULL || (m = BN_new()) == NULL) {
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ECDSAerror(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (!EC_GROUP_get_order(group, order, ctx)) {
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ECDSAerror(ERR_R_EC_LIB);
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goto err;
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}
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if (!ecdsa_prepare_digest(dgst, dgst_len, order, m))
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goto err;
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do {
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if (in_kinv == NULL || in_r == NULL) {
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if (!ECDSA_sign_setup(eckey, ctx, &kinv, &ret->r)) {
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ECDSAerror(ERR_R_ECDSA_LIB);
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goto err;
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}
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ckinv = kinv;
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} else {
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ckinv = in_kinv;
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if (BN_copy(ret->r, in_r) == NULL) {
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ECDSAerror(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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}
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/*
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* Compute:
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*
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* s = inv(k)(m + xr) mod order
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*
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* In order to reduce the possibility of a side-channel attack,
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* the following is calculated using a blinding value:
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*
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* s = inv(b)(bm + bxr)inv(k) mod order
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*
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* where b is a random value in the range [1, order-1].
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*/
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/* Generate b in range [1, order-1]. */
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if (!BN_sub(range, order, BN_value_one())) {
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ECDSAerror(ERR_R_BN_LIB);
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goto err;
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}
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if (!BN_rand_range(b, range)) {
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ECDSAerror(ERR_R_BN_LIB);
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goto err;
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}
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if (!BN_add(b, b, BN_value_one())) {
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ECDSAerror(ERR_R_BN_LIB);
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goto err;
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}
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if (BN_mod_inverse_ct(binv, b, order, ctx) == NULL) {
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ECDSAerror(ERR_R_BN_LIB);
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goto err;
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}
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if (!BN_mod_mul(bxr, b, priv_key, order, ctx)) { /* bx */
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ECDSAerror(ERR_R_BN_LIB);
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goto err;
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}
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if (!BN_mod_mul(bxr, bxr, ret->r, order, ctx)) { /* bxr */
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ECDSAerror(ERR_R_BN_LIB);
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goto err;
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}
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if (!BN_mod_mul(bm, b, m, order, ctx)) { /* bm */
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ECDSAerror(ERR_R_BN_LIB);
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goto err;
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}
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if (!BN_mod_add(s, bm, bxr, order, ctx)) { /* s = bm + bxr */
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ECDSAerror(ERR_R_BN_LIB);
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goto err;
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}
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if (!BN_mod_mul(s, s, ckinv, order, ctx)) { /* s = b(m + xr)k^-1 */
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ECDSAerror(ERR_R_BN_LIB);
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goto err;
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}
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if (!BN_mod_mul(s, s, binv, order, ctx)) { /* s = (m + xr)k^-1 */
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ECDSAerror(ERR_R_BN_LIB);
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goto err;
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}
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if (BN_is_zero(s)) {
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/*
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* If kinv and r have been supplied by the caller,
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* don't generate new kinv and r values
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*/
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if (in_kinv != NULL && in_r != NULL) {
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ECDSAerror(ECDSA_R_NEED_NEW_SETUP_VALUES);
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goto err;
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}
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} else
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/* s != 0 => we have a valid signature */
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break;
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} while (1);
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ok = 1;
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err:
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if (ok == 0) {
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ECDSA_SIG_free(ret);
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ret = NULL;
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}
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BN_CTX_free(ctx);
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BN_clear_free(b);
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BN_clear_free(binv);
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BN_clear_free(bm);
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BN_clear_free(bxr);
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BN_clear_free(kinv);
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BN_clear_free(m);
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BN_free(order);
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BN_free(range);
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return ret;
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}
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/* replace w/ ecdsa_do_sign() when ECDSA_METHOD gets removed */
|
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ECDSA_SIG *
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||
|
ossl_ecdsa_sign_sig(const unsigned char *dgst, int dgst_len,
|
||
|
const BIGNUM *in_kinv, const BIGNUM *in_r, EC_KEY *eckey)
|
||
|
{
|
||
|
ECDSA_DATA *ecdsa;
|
||
|
|
||
|
if ((ecdsa = ecdsa_check(eckey)) == NULL)
|
||
|
return NULL;
|
||
|
return ecdsa->meth->ecdsa_do_sign(dgst, dgst_len, in_kinv, in_r, eckey);
|
||
|
}
|
||
|
|
||
|
int
|
||
|
ossl_ecdsa_verify(int type, const unsigned char *dgst, int dgst_len,
|
||
|
const unsigned char *sigbuf, int sig_len, EC_KEY *eckey)
|
||
|
{
|
||
|
ECDSA_SIG *s;
|
||
|
unsigned char *der = NULL;
|
||
|
const unsigned char *p = sigbuf;
|
||
|
int derlen = -1;
|
||
|
int ret = -1;
|
||
|
|
||
|
if ((s = ECDSA_SIG_new()) == NULL)
|
||
|
return (ret);
|
||
|
if (d2i_ECDSA_SIG(&s, &p, sig_len) == NULL)
|
||
|
goto err;
|
||
|
/* Ensure signature uses DER and doesn't have trailing garbage */
|
||
|
derlen = i2d_ECDSA_SIG(s, &der);
|
||
|
if (derlen != sig_len || memcmp(sigbuf, der, derlen))
|
||
|
goto err;
|
||
|
ret = ECDSA_do_verify(dgst, dgst_len, s, eckey);
|
||
|
|
||
|
err:
|
||
|
freezero(der, derlen);
|
||
|
ECDSA_SIG_free(s);
|
||
|
return (ret);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
ecdsa_do_verify(const unsigned char *dgst, int dgst_len, const ECDSA_SIG *sig,
|
||
|
EC_KEY *eckey)
|
||
|
{
|
||
|
BN_CTX *ctx;
|
||
|
BIGNUM *order, *u1, *u2, *m, *X;
|
||
|
EC_POINT *point = NULL;
|
||
|
const EC_GROUP *group;
|
||
|
const EC_POINT *pub_key;
|
||
|
int ret = -1;
|
||
|
|
||
|
if (eckey == NULL || (group = EC_KEY_get0_group(eckey)) == NULL ||
|
||
|
(pub_key = EC_KEY_get0_public_key(eckey)) == NULL || sig == NULL) {
|
||
|
ECDSAerror(ECDSA_R_MISSING_PARAMETERS);
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
if ((ctx = BN_CTX_new()) == NULL) {
|
||
|
ECDSAerror(ERR_R_MALLOC_FAILURE);
|
||
|
return -1;
|
||
|
}
|
||
|
BN_CTX_start(ctx);
|
||
|
order = BN_CTX_get(ctx);
|
||
|
u1 = BN_CTX_get(ctx);
|
||
|
u2 = BN_CTX_get(ctx);
|
||
|
m = BN_CTX_get(ctx);
|
||
|
X = BN_CTX_get(ctx);
|
||
|
if (X == NULL) {
|
||
|
ECDSAerror(ERR_R_BN_LIB);
|
||
|
goto err;
|
||
|
}
|
||
|
|
||
|
if (!EC_GROUP_get_order(group, order, ctx)) {
|
||
|
ECDSAerror(ERR_R_EC_LIB);
|
||
|
goto err;
|
||
|
}
|
||
|
|
||
|
/* Verify that r and s are in the range [1, order-1]. */
|
||
|
if (BN_is_zero(sig->r) || BN_is_negative(sig->r) ||
|
||
|
BN_ucmp(sig->r, order) >= 0 ||
|
||
|
BN_is_zero(sig->s) || BN_is_negative(sig->s) ||
|
||
|
BN_ucmp(sig->s, order) >= 0) {
|
||
|
ECDSAerror(ECDSA_R_BAD_SIGNATURE);
|
||
|
ret = 0;
|
||
|
goto err;
|
||
|
}
|
||
|
|
||
|
if (!ecdsa_prepare_digest(dgst, dgst_len, order, m))
|
||
|
goto err;
|
||
|
|
||
|
if (!BN_mod_inverse_ct(u2, sig->s, order, ctx)) { /* w = inv(s) */
|
||
|
ECDSAerror(ERR_R_BN_LIB);
|
||
|
goto err;
|
||
|
}
|
||
|
if (!BN_mod_mul(u1, m, u2, order, ctx)) { /* u1 = mw */
|
||
|
ECDSAerror(ERR_R_BN_LIB);
|
||
|
goto err;
|
||
|
}
|
||
|
if (!BN_mod_mul(u2, sig->r, u2, order, ctx)) { /* u2 = rw */
|
||
|
ECDSAerror(ERR_R_BN_LIB);
|
||
|
goto err;
|
||
|
}
|
||
|
|
||
|
/* Compute the x-coordinate of G * u1 + pub_key * u2. */
|
||
|
if ((point = EC_POINT_new(group)) == NULL) {
|
||
|
ECDSAerror(ERR_R_MALLOC_FAILURE);
|
||
|
goto err;
|
||
|
}
|
||
|
if (!EC_POINT_mul(group, point, u1, pub_key, u2, ctx)) {
|
||
|
ECDSAerror(ERR_R_EC_LIB);
|
||
|
goto err;
|
||
|
}
|
||
|
if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) ==
|
||
|
NID_X9_62_prime_field) {
|
||
|
if (!EC_POINT_get_affine_coordinates_GFp(group, point, X, NULL,
|
||
|
ctx)) {
|
||
|
ECDSAerror(ERR_R_EC_LIB);
|
||
|
goto err;
|
||
|
}
|
||
|
}
|
||
|
#ifndef OPENSSL_NO_EC2M
|
||
|
else { /* NID_X9_62_characteristic_two_field */
|
||
|
if (!EC_POINT_get_affine_coordinates_GF2m(group, point, X, NULL,
|
||
|
ctx)) {
|
||
|
ECDSAerror(ERR_R_EC_LIB);
|
||
|
goto err;
|
||
|
}
|
||
|
}
|
||
|
#endif
|
||
|
if (!BN_nnmod(u1, X, order, ctx)) {
|
||
|
ECDSAerror(ERR_R_BN_LIB);
|
||
|
goto err;
|
||
|
}
|
||
|
|
||
|
/* If the signature is correct, the x-coordinate is equal to sig->r. */
|
||
|
ret = (BN_ucmp(u1, sig->r) == 0);
|
||
|
|
||
|
err:
|
||
|
BN_CTX_end(ctx);
|
||
|
BN_CTX_free(ctx);
|
||
|
EC_POINT_free(point);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
/* replace w/ ecdsa_do_verify() when ECDSA_METHOD gets removed */
|
||
|
int
|
||
|
ossl_ecdsa_verify_sig(const unsigned char *dgst, int dgst_len,
|
||
|
const ECDSA_SIG *sig, EC_KEY *eckey)
|
||
|
{
|
||
|
ECDSA_DATA *ecdsa;
|
||
|
|
||
|
if ((ecdsa = ecdsa_check(eckey)) == NULL)
|
||
|
return 0;
|
||
|
return ecdsa->meth->ecdsa_do_verify(dgst, dgst_len, sig, eckey);
|
||
|
}
|