--- /dev/null
+/* ====================================================================
+ * 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 */);
+ }
+
+ 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(digest, digest_len, 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);
+}
git://repos.xcallymotion.com / motion2.git / blobdiff