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- /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
- * project 2006.
- */
- /* ====================================================================
- * Copyright (c) 2006 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
- * licensing@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/evp.h>
-
- #include <openssl/bn.h>
- #include <openssl/bytestring.h>
- #include <openssl/ec.h>
- #include <openssl/ec_key.h>
- #include <openssl/ecdsa.h>
- #include <openssl/err.h>
-
- #include "internal.h"
-
-
- static int eckey_pub_encode(CBB *out, const EVP_PKEY *key) {
- const EC_KEY *ec_key = key->pkey.ec;
- const EC_GROUP *group = EC_KEY_get0_group(ec_key);
- const EC_POINT *public_key = EC_KEY_get0_public_key(ec_key);
-
- /* See RFC 5480, section 2. */
- CBB spki, algorithm, oid, key_bitstring;
- if (!CBB_add_asn1(out, &spki, CBS_ASN1_SEQUENCE) ||
- !CBB_add_asn1(&spki, &algorithm, CBS_ASN1_SEQUENCE) ||
- !CBB_add_asn1(&algorithm, &oid, CBS_ASN1_OBJECT) ||
- !CBB_add_bytes(&oid, ec_asn1_meth.oid, ec_asn1_meth.oid_len) ||
- !EC_KEY_marshal_curve_name(&algorithm, group) ||
- !CBB_add_asn1(&spki, &key_bitstring, CBS_ASN1_BITSTRING) ||
- !CBB_add_u8(&key_bitstring, 0 /* padding */) ||
- !EC_POINT_point2cbb(&key_bitstring, group, public_key,
- POINT_CONVERSION_UNCOMPRESSED, NULL) ||
- !CBB_flush(out)) {
- OPENSSL_PUT_ERROR(EVP, EVP_R_ENCODE_ERROR);
- return 0;
- }
-
- return 1;
- }
-
- static int eckey_pub_decode(EVP_PKEY *out, CBS *params, CBS *key) {
- /* See RFC 5480, section 2. */
-
- /* The parameters are a named curve. */
- EC_POINT *point = NULL;
- EC_KEY *eckey = NULL;
- EC_GROUP *group = EC_KEY_parse_curve_name(params);
- if (group == NULL || CBS_len(params) != 0) {
- OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR);
- goto err;
- }
-
- eckey = EC_KEY_new();
- if (eckey == NULL || !EC_KEY_set_group(eckey, group)) {
- goto err;
- }
-
- point = EC_POINT_new(group);
- if (point == NULL ||
- !EC_POINT_oct2point(group, point, CBS_data(key), CBS_len(key), NULL) ||
- !EC_KEY_set_public_key(eckey, point)) {
- goto err;
- }
-
- EC_GROUP_free(group);
- EC_POINT_free(point);
- EVP_PKEY_assign_EC_KEY(out, eckey);
- return 1;
-
- err:
- EC_GROUP_free(group);
- EC_POINT_free(point);
- EC_KEY_free(eckey);
- return 0;
- }
-
- static int eckey_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b) {
- int r;
- const EC_GROUP *group = EC_KEY_get0_group(b->pkey.ec);
- const EC_POINT *pa = EC_KEY_get0_public_key(a->pkey.ec),
- *pb = EC_KEY_get0_public_key(b->pkey.ec);
- r = EC_POINT_cmp(group, pa, pb, NULL);
- if (r == 0) {
- return 1;
- } else if (r == 1) {
- return 0;
- } else {
- return -2;
- }
- }
-
- static int eckey_priv_decode(EVP_PKEY *out, CBS *params, CBS *key) {
- /* See RFC 5915. */
- EC_GROUP *group = EC_KEY_parse_parameters(params);
- if (group == NULL || CBS_len(params) != 0) {
- OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR);
- EC_GROUP_free(group);
- return 0;
- }
-
- EC_KEY *ec_key = EC_KEY_parse_private_key(key, group);
- EC_GROUP_free(group);
- if (ec_key == NULL || CBS_len(key) != 0) {
- OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR);
- EC_KEY_free(ec_key);
- return 0;
- }
-
- EVP_PKEY_assign_EC_KEY(out, ec_key);
- return 1;
- }
-
- static int eckey_priv_encode(CBB *out, const EVP_PKEY *key) {
- const EC_KEY *ec_key = key->pkey.ec;
-
- /* Omit the redundant copy of the curve name. This contradicts RFC 5915 but
- * aligns with PKCS #11. SEC 1 only says they may be omitted if known by other
- * means. Both OpenSSL and NSS omit the redundant parameters, so we omit them
- * as well. */
- unsigned enc_flags = EC_KEY_get_enc_flags(ec_key) | EC_PKEY_NO_PARAMETERS;
-
- /* See RFC 5915. */
- CBB pkcs8, algorithm, oid, private_key;
- if (!CBB_add_asn1(out, &pkcs8, CBS_ASN1_SEQUENCE) ||
- !CBB_add_asn1_uint64(&pkcs8, 0 /* version */) ||
- !CBB_add_asn1(&pkcs8, &algorithm, CBS_ASN1_SEQUENCE) ||
- !CBB_add_asn1(&algorithm, &oid, CBS_ASN1_OBJECT) ||
- !CBB_add_bytes(&oid, ec_asn1_meth.oid, ec_asn1_meth.oid_len) ||
- !EC_KEY_marshal_curve_name(&algorithm, EC_KEY_get0_group(ec_key)) ||
- !CBB_add_asn1(&pkcs8, &private_key, CBS_ASN1_OCTETSTRING) ||
- !EC_KEY_marshal_private_key(&private_key, ec_key, enc_flags) ||
- !CBB_flush(out)) {
- OPENSSL_PUT_ERROR(EVP, EVP_R_ENCODE_ERROR);
- return 0;
- }
-
- return 1;
- }
-
- static int int_ec_size(const EVP_PKEY *pkey) {
- return ECDSA_size(pkey->pkey.ec);
- }
-
- static int ec_bits(const EVP_PKEY *pkey) {
- const EC_GROUP *group = EC_KEY_get0_group(pkey->pkey.ec);
- if (group == NULL) {
- ERR_clear_error();
- return 0;
- }
- return BN_num_bits(EC_GROUP_get0_order(group));
- }
-
- static int ec_missing_parameters(const EVP_PKEY *pkey) {
- return EC_KEY_get0_group(pkey->pkey.ec) == NULL;
- }
-
- static int ec_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from) {
- EC_GROUP *group = EC_GROUP_dup(EC_KEY_get0_group(from->pkey.ec));
- if (group == NULL ||
- EC_KEY_set_group(to->pkey.ec, group) == 0) {
- return 0;
- }
- EC_GROUP_free(group);
- return 1;
- }
-
- static int ec_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b) {
- const EC_GROUP *group_a = EC_KEY_get0_group(a->pkey.ec),
- *group_b = EC_KEY_get0_group(b->pkey.ec);
- if (EC_GROUP_cmp(group_a, group_b, NULL) != 0) {
- /* mismatch */
- return 0;
- }
- return 1;
- }
-
- static void int_ec_free(EVP_PKEY *pkey) { EC_KEY_free(pkey->pkey.ec); }
-
- static int eckey_opaque(const EVP_PKEY *pkey) {
- return EC_KEY_is_opaque(pkey->pkey.ec);
- }
-
- const EVP_PKEY_ASN1_METHOD ec_asn1_meth = {
- EVP_PKEY_EC,
- /* 1.2.840.10045.2.1 */
- {0x2a, 0x86, 0x48, 0xce, 0x3d, 0x02, 0x01}, 7,
-
- eckey_pub_decode,
- eckey_pub_encode,
- eckey_pub_cmp,
-
- eckey_priv_decode,
- eckey_priv_encode,
-
- eckey_opaque,
- 0 /* pkey_supports_digest */,
-
- int_ec_size,
- ec_bits,
-
- ec_missing_parameters,
- ec_copy_parameters,
- ec_cmp_parameters,
-
- int_ec_free,
- };
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