95c29f3cd1
Initial fork from f2d678e6e89b6508147086610e985d4e8416e867 (1.0.2 beta). (This change contains substantial changes from the original and effectively starts a new history.)
466 lines
14 KiB
C
466 lines
14 KiB
C
/* ====================================================================
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* Copyright (c) 1998-2005 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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#include <openssl/ecdsa.h>
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#include <openssl/bn.h>
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#include <openssl/err.h>
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#include <openssl/mem.h>
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#include <openssl/thread.h>
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#include "../ec/internal.h"
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int ECDSA_sign(int type, const uint8_t *digest, size_t digest_len, uint8_t *sig,
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unsigned int *sig_len, EC_KEY *eckey) {
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if (eckey->ecdsa_meth && eckey->ecdsa_meth->sign) {
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return eckey->ecdsa_meth->sign(digest, digest_len, sig, sig_len, eckey);
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}
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return ECDSA_sign_ex(type, digest, digest_len, sig, sig_len, NULL, NULL,
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eckey);
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}
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int ECDSA_verify(int type, const uint8_t *digest, size_t digest_len,
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const uint8_t *sig, size_t sig_len, EC_KEY *eckey) {
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ECDSA_SIG *s;
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int ret = -1;
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if (eckey->ecdsa_meth && eckey->ecdsa_meth->verify) {
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return eckey->ecdsa_meth->verify(digest, digest_len, sig, sig_len, eckey);
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}
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s = ECDSA_SIG_new();
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if (s == NULL || d2i_ECDSA_SIG(&s, &sig, sig_len) == NULL) {
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goto err;
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}
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ret = ECDSA_do_verify(digest, digest_len, s, eckey);
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err:
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if (s != NULL) {
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ECDSA_SIG_free(s);
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}
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return ret;
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}
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/* digest_to_bn interprets |digest_len| bytes from |digest| as a big-endian
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* number and sets |out| to that value. It then truncates |out| so that it's,
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* at most, as long as |order|. It returns one on success and zero otherwise. */
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static int digest_to_bn(BIGNUM *out, const uint8_t *digest, size_t digest_len,
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const BIGNUM *order) {
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size_t num_bits;
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num_bits = BN_num_bits(order);
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/* Need to truncate digest if it is too long: first truncate whole
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* bytes. */
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if (8 * digest_len > num_bits) {
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digest_len = (num_bits + 7) / 8;
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}
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if (!BN_bin2bn(digest, digest_len, out)) {
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OPENSSL_PUT_ERROR(ECDSA, digest_to_bn, ERR_R_BN_LIB);
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return 0;
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}
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/* If still too long truncate remaining bits with a shift */
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if ((8 * digest_len > num_bits) &&
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!BN_rshift(out, out, 8 - (num_bits & 0x7))) {
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OPENSSL_PUT_ERROR(ECDSA, digest_to_bn, ERR_R_BN_LIB);
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return 0;
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}
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return 1;
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}
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ECDSA_SIG *ECDSA_do_sign(const uint8_t *digest, size_t digest_len,
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EC_KEY *key) {
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return ECDSA_do_sign_ex(digest, digest_len, NULL, NULL, key);
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}
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int ECDSA_do_verify(const uint8_t *digest, size_t digest_len,
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const ECDSA_SIG *sig, EC_KEY *eckey) {
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int ret = -1;
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BN_CTX *ctx;
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BIGNUM *order, *u1, *u2, *m, *X;
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EC_POINT *point = NULL;
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const EC_GROUP *group;
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const EC_POINT *pub_key;
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if (eckey->ecdsa_meth && eckey->ecdsa_meth->verify) {
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OPENSSL_PUT_ERROR(ECDSA, ECDSA_sign_ex, ECDSA_R_NOT_IMPLEMENTED);
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return -1;
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}
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/* check input values */
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if (eckey == NULL || (group = EC_KEY_get0_group(eckey)) == NULL ||
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(pub_key = EC_KEY_get0_public_key(eckey)) == NULL || sig == NULL) {
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OPENSSL_PUT_ERROR(ECDSA, ECDSA_do_verify, ECDSA_R_MISSING_PARAMETERS);
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return -1;
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}
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ctx = BN_CTX_new();
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if (!ctx) {
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OPENSSL_PUT_ERROR(ECDSA, ECDSA_do_verify, ERR_R_MALLOC_FAILURE);
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return -1;
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}
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BN_CTX_start(ctx);
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order = BN_CTX_get(ctx);
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u1 = BN_CTX_get(ctx);
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u2 = BN_CTX_get(ctx);
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m = BN_CTX_get(ctx);
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X = BN_CTX_get(ctx);
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if (!X) {
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OPENSSL_PUT_ERROR(ECDSA, ECDSA_do_verify, ERR_R_BN_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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OPENSSL_PUT_ERROR(ECDSA, ECDSA_do_verify, ERR_R_EC_LIB);
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goto err;
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}
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if (BN_is_zero(sig->r) || BN_is_negative(sig->r) ||
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BN_ucmp(sig->r, order) >= 0 || BN_is_zero(sig->s) ||
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BN_is_negative(sig->s) || BN_ucmp(sig->s, order) >= 0) {
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OPENSSL_PUT_ERROR(ECDSA, ECDSA_do_verify, ECDSA_R_BAD_SIGNATURE);
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ret = 0; /* signature is invalid */
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goto err;
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}
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/* calculate tmp1 = inv(S) mod order */
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if (!BN_mod_inverse(u2, sig->s, order, ctx)) {
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OPENSSL_PUT_ERROR(ECDSA, ECDSA_do_verify, ERR_R_BN_LIB);
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goto err;
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}
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if (!digest_to_bn(m, digest, digest_len, order)) {
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goto err;
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}
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/* u1 = m * tmp mod order */
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if (!BN_mod_mul(u1, m, u2, order, ctx)) {
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OPENSSL_PUT_ERROR(ECDSA, ECDSA_do_verify, ERR_R_BN_LIB);
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goto err;
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}
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/* u2 = r * w mod q */
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if (!BN_mod_mul(u2, sig->r, u2, order, ctx)) {
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OPENSSL_PUT_ERROR(ECDSA, ECDSA_do_verify, ERR_R_BN_LIB);
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goto err;
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}
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point = EC_POINT_new(group);
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if (point == NULL) {
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OPENSSL_PUT_ERROR(ECDSA, ECDSA_do_verify, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (!EC_POINT_mul(group, point, u1, pub_key, u2, ctx)) {
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OPENSSL_PUT_ERROR(ECDSA, ECDSA_do_verify, 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, point, X, NULL, ctx)) {
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OPENSSL_PUT_ERROR(ECDSA, ECDSA_do_verify, ERR_R_EC_LIB);
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goto err;
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}
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if (!BN_nnmod(u1, X, order, ctx)) {
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OPENSSL_PUT_ERROR(ECDSA, ECDSA_do_verify, ERR_R_BN_LIB);
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goto err;
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}
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/* if the signature is correct u1 is equal to sig->r */
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ret = (BN_ucmp(u1, sig->r) == 0);
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err:
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BN_CTX_end(ctx);
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BN_CTX_free(ctx);
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if (point) {
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EC_POINT_free(point);
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}
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return ret;
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}
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int ECDSA_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp,
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BIGNUM **rp) {
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BN_CTX *ctx = NULL;
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BIGNUM *k = NULL, *r = NULL, *order = NULL, *X = NULL;
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EC_POINT *tmp_point = NULL;
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const EC_GROUP *group;
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int ret = 0;
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if (eckey == NULL || (group = EC_KEY_get0_group(eckey)) == NULL) {
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OPENSSL_PUT_ERROR(ECDSA, ECDSA_sign_setup, ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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if (ctx_in == NULL) {
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if ((ctx = BN_CTX_new()) == NULL) {
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OPENSSL_PUT_ERROR(ECDSA, ECDSA_sign_setup, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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} else {
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ctx = ctx_in;
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}
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k = BN_new(); /* this value is later returned in *kinvp */
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r = BN_new(); /* this value is later returned in *rp */
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order = BN_new();
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X = BN_new();
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if (!k || !r || !order || !X) {
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OPENSSL_PUT_ERROR(ECDSA, ECDSA_sign_setup, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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tmp_point = EC_POINT_new(group);
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if (tmp_point == NULL) {
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OPENSSL_PUT_ERROR(ECDSA, ECDSA_sign_setup, 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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OPENSSL_PUT_ERROR(ECDSA, ECDSA_sign_setup, ERR_R_EC_LIB);
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goto err;
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}
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do {
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/* get random k */
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do {
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if (!BN_rand_range(k, order)) {
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OPENSSL_PUT_ERROR(ECDSA, ECDSA_sign_setup,
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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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/* 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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if (!BN_add(k, k, order)) {
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goto err;
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}
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if (BN_num_bits(k) <= BN_num_bits(order)) {
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if (!BN_add(k, k, order)) {
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goto err;
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}
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}
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/* compute r the x-coordinate of generator * k */
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if (!EC_POINT_mul(group, tmp_point, k, NULL, NULL, ctx)) {
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OPENSSL_PUT_ERROR(ECDSA, ECDSA_sign_setup, 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, tmp_point, X, NULL, ctx)) {
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OPENSSL_PUT_ERROR(ECDSA, ECDSA_sign_setup, 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)) {
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OPENSSL_PUT_ERROR(ECDSA, ECDSA_sign_setup, 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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/* compute the inverse of k */
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if (!BN_mod_inverse(k, k, order, ctx)) {
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OPENSSL_PUT_ERROR(ECDSA, ECDSA_sign_setup, ERR_R_BN_LIB);
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goto err;
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}
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/* clear old values if necessary */
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if (*rp != NULL) {
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BN_clear_free(*rp);
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}
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if (*kinvp != NULL) {
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BN_clear_free(*kinvp);
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}
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/* save the pre-computed values */
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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) {
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if (k != NULL) {
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BN_clear_free(k);
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}
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if (r != NULL) {
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BN_clear_free(r);
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}
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}
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if (ctx_in == NULL)
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BN_CTX_free(ctx);
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if (order != NULL)
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BN_free(order);
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if (tmp_point != NULL)
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EC_POINT_free(tmp_point);
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if (X)
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BN_clear_free(X);
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return ret;
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}
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ECDSA_SIG *ECDSA_do_sign_ex(const uint8_t *digest, size_t digest_len,
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const BIGNUM *in_kinv, const BIGNUM *in_r,
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EC_KEY *eckey) {
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int ok = 0;
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BIGNUM *kinv = NULL, *s, *m = NULL, *tmp = NULL, *order = NULL;
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const BIGNUM *ckinv;
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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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const BIGNUM *priv_key;
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if (eckey->ecdsa_meth && eckey->ecdsa_meth->sign) {
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OPENSSL_PUT_ERROR(ECDSA, ECDSA_sign_ex, ECDSA_R_NOT_IMPLEMENTED);
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return NULL;
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}
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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) {
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OPENSSL_PUT_ERROR(ECDSA, ECDSA_do_sign_ex, ERR_R_PASSED_NULL_PARAMETER);
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return NULL;
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}
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ret = ECDSA_SIG_new();
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if (!ret) {
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OPENSSL_PUT_ERROR(ECDSA, ECDSA_do_sign_ex, 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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(tmp = BN_new()) == NULL || (m = BN_new()) == NULL) {
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OPENSSL_PUT_ERROR(ECDSA, ECDSA_do_sign_ex, 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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OPENSSL_PUT_ERROR(ECDSA, ECDSA_do_sign_ex, ERR_R_EC_LIB);
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goto err;
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}
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if (!digest_to_bn(m, digest, digest_len, order)) {
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goto err;
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}
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for (;;) {
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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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OPENSSL_PUT_ERROR(ECDSA, ECDSA_do_sign_ex, 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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OPENSSL_PUT_ERROR(ECDSA, ECDSA_do_sign_ex, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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}
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if (!BN_mod_mul(tmp, priv_key, ret->r, order, ctx)) {
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OPENSSL_PUT_ERROR(ECDSA, ECDSA_do_sign_ex, ERR_R_BN_LIB);
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goto err;
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}
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if (!BN_mod_add_quick(s, tmp, m, order)) {
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OPENSSL_PUT_ERROR(ECDSA, ECDSA_do_sign_ex, 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)) {
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OPENSSL_PUT_ERROR(ECDSA, ECDSA_do_sign_ex, 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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/* if kinv and r have been supplied by the caller
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* don't to generate new kinv and r values */
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if (in_kinv != NULL && in_r != NULL) {
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OPENSSL_PUT_ERROR(ECDSA, ECDSA_do_sign_ex, 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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}
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}
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ok = 1;
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err:
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if (!ok) {
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ECDSA_SIG_free(ret);
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ret = NULL;
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}
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if (ctx)
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BN_CTX_free(ctx);
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if (m)
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BN_clear_free(m);
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if (tmp)
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BN_clear_free(tmp);
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if (order)
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BN_free(order);
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if (kinv)
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BN_clear_free(kinv);
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return ret;
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}
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int ECDSA_sign_ex(int type, const uint8_t *digest, size_t digest_len,
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uint8_t *sig, unsigned int *sig_len, const BIGNUM *kinv,
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const BIGNUM *r, EC_KEY *eckey) {
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ECDSA_SIG *s = NULL;
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if (eckey->ecdsa_meth && eckey->ecdsa_meth->sign) {
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OPENSSL_PUT_ERROR(ECDSA, ECDSA_sign_ex, ECDSA_R_NOT_IMPLEMENTED);
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*sig_len = 0;
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return 0;
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}
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s = ECDSA_do_sign_ex(digest, digest_len, kinv, r, eckey);
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if (s == NULL) {
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*sig_len = 0;
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return 0;
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}
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*sig_len = 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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