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- /* ====================================================================
- * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. All advertising materials mentioning features or use of this
- * software must display the following acknowledgment:
- * "This product includes software developed by the OpenSSL Project
- * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
- *
- * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
- * endorse or promote products derived from this software without
- * prior written permission. For written permission, please contact
- * openssl-core@OpenSSL.org.
- *
- * 5. Products derived from this software may not be called "OpenSSL"
- * nor may "OpenSSL" appear in their names without prior written
- * permission of the OpenSSL Project.
- *
- * 6. Redistributions of any form whatsoever must retain the following
- * acknowledgment:
- * "This product includes software developed by the OpenSSL Project
- * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
- *
- * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
- * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
- * OF THE POSSIBILITY OF SUCH DAMAGE.
- * ====================================================================
- *
- * This product includes cryptographic software written by Eric Young
- * (eay@cryptsoft.com). This product includes software written by Tim
- * Hudson (tjh@cryptsoft.com). */
-
- #include <openssl/ecdsa.h>
-
- #include <limits.h>
- #include <string.h>
-
- #include <openssl/bn.h>
- #include <openssl/bytestring.h>
- #include <openssl/err.h>
- #include <openssl/ec_key.h>
- #include <openssl/mem.h>
-
- #include "../bytestring/internal.h"
- #include "../fipsmodule/ec/internal.h"
- #include "../internal.h"
-
-
- int ECDSA_sign(int type, const uint8_t *digest, size_t digest_len, uint8_t *sig,
- unsigned int *sig_len, const EC_KEY *eckey) {
- if (eckey->ecdsa_meth && eckey->ecdsa_meth->sign) {
- return eckey->ecdsa_meth->sign(digest, digest_len, sig, sig_len,
- (EC_KEY*) eckey /* cast away const */);
- }
-
- return ECDSA_sign_ex(type, digest, digest_len, sig, sig_len, NULL, NULL,
- eckey);
- }
-
- int ECDSA_sign_ex(int type, const uint8_t *digest, size_t digest_len,
- uint8_t *sig, unsigned int *sig_len, const BIGNUM *kinv,
- const BIGNUM *r, const EC_KEY *eckey) {
- int ret = 0;
- ECDSA_SIG *s = NULL;
-
- if (eckey->ecdsa_meth && eckey->ecdsa_meth->sign) {
- OPENSSL_PUT_ERROR(ECDSA, ECDSA_R_NOT_IMPLEMENTED);
- *sig_len = 0;
- goto err;
- }
-
- s = ECDSA_do_sign_ex(digest, digest_len, kinv, r, eckey);
- if (s == NULL) {
- *sig_len = 0;
- goto err;
- }
-
- CBB cbb;
- CBB_zero(&cbb);
- size_t len;
- if (!CBB_init_fixed(&cbb, sig, ECDSA_size(eckey)) ||
- !ECDSA_SIG_marshal(&cbb, s) ||
- !CBB_finish(&cbb, NULL, &len)) {
- OPENSSL_PUT_ERROR(ECDSA, ECDSA_R_ENCODE_ERROR);
- CBB_cleanup(&cbb);
- *sig_len = 0;
- goto err;
- }
- *sig_len = (unsigned)len;
- ret = 1;
-
- err:
- ECDSA_SIG_free(s);
- return ret;
- }
-
- int ECDSA_verify(int type, const uint8_t *digest, size_t digest_len,
- const uint8_t *sig, size_t sig_len, const EC_KEY *eckey) {
- ECDSA_SIG *s;
- int ret = 0;
- uint8_t *der = NULL;
-
- // Decode the ECDSA signature.
- s = ECDSA_SIG_from_bytes(sig, sig_len);
- if (s == NULL) {
- goto err;
- }
-
- // Defend against potential laxness in the DER parser.
- size_t der_len;
- if (!ECDSA_SIG_to_bytes(&der, &der_len, s) ||
- der_len != sig_len || OPENSSL_memcmp(sig, der, sig_len) != 0) {
- // This should never happen. crypto/bytestring is strictly DER.
- OPENSSL_PUT_ERROR(ECDSA, ERR_R_INTERNAL_ERROR);
- goto err;
- }
-
- ret = ECDSA_do_verify(digest, digest_len, s, eckey);
-
- err:
- OPENSSL_free(der);
- ECDSA_SIG_free(s);
- return ret;
- }
-
-
- size_t ECDSA_size(const EC_KEY *key) {
- if (key == NULL) {
- return 0;
- }
-
- size_t group_order_size;
- if (key->ecdsa_meth && key->ecdsa_meth->group_order_size) {
- group_order_size = key->ecdsa_meth->group_order_size(key);
- } else {
- const EC_GROUP *group = EC_KEY_get0_group(key);
- if (group == NULL) {
- return 0;
- }
-
- group_order_size = BN_num_bytes(EC_GROUP_get0_order(group));
- }
-
- return ECDSA_SIG_max_len(group_order_size);
- }
-
- ECDSA_SIG *ECDSA_SIG_parse(CBS *cbs) {
- ECDSA_SIG *ret = ECDSA_SIG_new();
- if (ret == NULL) {
- return NULL;
- }
- CBS child;
- if (!CBS_get_asn1(cbs, &child, CBS_ASN1_SEQUENCE) ||
- !BN_parse_asn1_unsigned(&child, ret->r) ||
- !BN_parse_asn1_unsigned(&child, ret->s) ||
- CBS_len(&child) != 0) {
- OPENSSL_PUT_ERROR(ECDSA, ECDSA_R_BAD_SIGNATURE);
- ECDSA_SIG_free(ret);
- return NULL;
- }
- return ret;
- }
-
- ECDSA_SIG *ECDSA_SIG_from_bytes(const uint8_t *in, size_t in_len) {
- CBS cbs;
- CBS_init(&cbs, in, in_len);
- ECDSA_SIG *ret = ECDSA_SIG_parse(&cbs);
- if (ret == NULL || CBS_len(&cbs) != 0) {
- OPENSSL_PUT_ERROR(ECDSA, ECDSA_R_BAD_SIGNATURE);
- ECDSA_SIG_free(ret);
- return NULL;
- }
- return ret;
- }
-
- int ECDSA_SIG_marshal(CBB *cbb, const ECDSA_SIG *sig) {
- CBB child;
- if (!CBB_add_asn1(cbb, &child, CBS_ASN1_SEQUENCE) ||
- !BN_marshal_asn1(&child, sig->r) ||
- !BN_marshal_asn1(&child, sig->s) ||
- !CBB_flush(cbb)) {
- OPENSSL_PUT_ERROR(ECDSA, ECDSA_R_ENCODE_ERROR);
- return 0;
- }
- return 1;
- }
-
- int ECDSA_SIG_to_bytes(uint8_t **out_bytes, size_t *out_len,
- const ECDSA_SIG *sig) {
- CBB cbb;
- CBB_zero(&cbb);
- if (!CBB_init(&cbb, 0) ||
- !ECDSA_SIG_marshal(&cbb, sig) ||
- !CBB_finish(&cbb, out_bytes, out_len)) {
- OPENSSL_PUT_ERROR(ECDSA, ECDSA_R_ENCODE_ERROR);
- CBB_cleanup(&cbb);
- return 0;
- }
- return 1;
- }
-
- // der_len_len returns the number of bytes needed to represent a length of |len|
- // in DER.
- static size_t der_len_len(size_t len) {
- if (len < 0x80) {
- return 1;
- }
- size_t ret = 1;
- while (len > 0) {
- ret++;
- len >>= 8;
- }
- return ret;
- }
-
- size_t ECDSA_SIG_max_len(size_t order_len) {
- // Compute the maximum length of an |order_len| byte integer. Defensively
- // assume that the leading 0x00 is included.
- size_t integer_len = 1 /* tag */ + der_len_len(order_len + 1) + 1 + order_len;
- if (integer_len < order_len) {
- return 0;
- }
- // An ECDSA signature is two INTEGERs.
- size_t value_len = 2 * integer_len;
- if (value_len < integer_len) {
- return 0;
- }
- // Add the header.
- size_t ret = 1 /* tag */ + der_len_len(value_len) + value_len;
- if (ret < value_len) {
- return 0;
- }
- return ret;
- }
-
- ECDSA_SIG *d2i_ECDSA_SIG(ECDSA_SIG **out, const uint8_t **inp, long len) {
- if (len < 0) {
- return NULL;
- }
- CBS cbs;
- CBS_init(&cbs, *inp, (size_t)len);
- ECDSA_SIG *ret = ECDSA_SIG_parse(&cbs);
- if (ret == NULL) {
- return NULL;
- }
- if (out != NULL) {
- ECDSA_SIG_free(*out);
- *out = ret;
- }
- *inp = CBS_data(&cbs);
- return ret;
- }
-
- int i2d_ECDSA_SIG(const ECDSA_SIG *sig, uint8_t **outp) {
- CBB cbb;
- if (!CBB_init(&cbb, 0) ||
- !ECDSA_SIG_marshal(&cbb, sig)) {
- CBB_cleanup(&cbb);
- return -1;
- }
- return CBB_finish_i2d(&cbb, outp);
- }
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