| /* 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, |
| |
| int_ec_size, |
| ec_bits, |
| |
| ec_missing_parameters, |
| ec_copy_parameters, |
| ec_cmp_parameters, |
| |
| int_ec_free, |
| }; |