ref: bfe9da47cfa2f51ebef78c59332b5ba2deba306d
dir: /third_party/boringssl/src/crypto/evp/p_ec_asn1.c/
/* 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) {
return EC_KEY_set_group(to->pkey.ec, EC_KEY_get0_group(from->pkey.ec));
}
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,
NULL /* set_priv_raw */,
NULL /* set_pub_raw */,
NULL /* get_priv_raw */,
NULL /* get_pub_raw */,
eckey_opaque,
int_ec_size,
ec_bits,
ec_missing_parameters,
ec_copy_parameters,
ec_cmp_parameters,
int_ec_free,
};