/* 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_grpc/evp.h> #include <openssl_grpc/bn.h> #include <openssl_grpc/bytestring.h> #include <openssl_grpc/ec.h> #include <openssl_grpc/ec_key.h> #include <openssl_grpc/ecdsa.h> #include <openssl_grpc/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, };