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