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273 lines
7.8 KiB
C
273 lines
7.8 KiB
C
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
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* 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/digest.h>
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#include <openssl/bn.h>
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#include <openssl/bytestring.h>
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#include <openssl/dsa.h>
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#include <openssl/err.h>
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#include "internal.h"
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static int dsa_pub_decode(EVP_PKEY *out, CBS *params, CBS *key) {
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// See RFC 3279, section 2.3.2.
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// Parameters may or may not be present.
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DSA *dsa;
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if (CBS_len(params) == 0) {
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dsa = DSA_new();
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if (dsa == NULL) {
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return 0;
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}
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} else {
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dsa = DSA_parse_parameters(params);
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if (dsa == 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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}
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dsa->pub_key = BN_new();
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if (dsa->pub_key == NULL) {
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goto err;
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}
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if (!BN_parse_asn1_unsigned(key, dsa->pub_key) ||
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CBS_len(key) != 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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EVP_PKEY_assign_DSA(out, dsa);
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return 1;
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err:
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DSA_free(dsa);
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return 0;
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}
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static int dsa_pub_encode(CBB *out, const EVP_PKEY *key) {
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const DSA *dsa = key->pkey.dsa;
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const int has_params = dsa->p != NULL && dsa->q != NULL && dsa->g != NULL;
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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, dsa_asn1_meth.oid, dsa_asn1_meth.oid_len) ||
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(has_params &&
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!DSA_marshal_parameters(&algorithm, dsa)) ||
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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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!BN_marshal_asn1(&key_bitstring, dsa->pub_key) ||
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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 dsa_priv_decode(EVP_PKEY *out, CBS *params, CBS *key) {
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// See PKCS#11, v2.40, section 2.5.
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// Decode parameters.
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BN_CTX *ctx = NULL;
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DSA *dsa = DSA_parse_parameters(params);
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if (dsa == 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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dsa->priv_key = BN_new();
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dsa->pub_key = BN_new();
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if (dsa->priv_key == NULL || dsa->pub_key == NULL) {
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goto err;
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}
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// Decode the key.
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if (!BN_parse_asn1_unsigned(key, dsa->priv_key) ||
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CBS_len(key) != 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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// Calculate the public key.
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ctx = BN_CTX_new();
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if (ctx == NULL ||
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!BN_mod_exp_mont_consttime(dsa->pub_key, dsa->g, dsa->priv_key, dsa->p,
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ctx, NULL)) {
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goto err;
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}
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BN_CTX_free(ctx);
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EVP_PKEY_assign_DSA(out, dsa);
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return 1;
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err:
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BN_CTX_free(ctx);
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DSA_free(dsa);
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return 0;
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}
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static int dsa_priv_encode(CBB *out, const EVP_PKEY *key) {
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const DSA *dsa = key->pkey.dsa;
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if (dsa == NULL || dsa->priv_key == NULL) {
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OPENSSL_PUT_ERROR(EVP, EVP_R_MISSING_PARAMETERS);
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return 0;
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}
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// See PKCS#11, v2.40, section 2.5.
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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, dsa_asn1_meth.oid, dsa_asn1_meth.oid_len) ||
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!DSA_marshal_parameters(&algorithm, dsa) ||
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!CBB_add_asn1(&pkcs8, &private_key, CBS_ASN1_OCTETSTRING) ||
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!BN_marshal_asn1(&private_key, dsa->priv_key) ||
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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_dsa_size(const EVP_PKEY *pkey) {
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return DSA_size(pkey->pkey.dsa);
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}
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static int dsa_bits(const EVP_PKEY *pkey) {
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return BN_num_bits(pkey->pkey.dsa->p);
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}
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static int dsa_missing_parameters(const EVP_PKEY *pkey) {
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DSA *dsa;
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dsa = pkey->pkey.dsa;
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if (dsa->p == NULL || dsa->q == NULL || dsa->g == NULL) {
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return 1;
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}
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return 0;
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}
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static int dup_bn_into(BIGNUM **out, BIGNUM *src) {
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BIGNUM *a;
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a = BN_dup(src);
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if (a == NULL) {
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return 0;
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}
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BN_free(*out);
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*out = a;
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return 1;
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}
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static int dsa_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from) {
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if (!dup_bn_into(&to->pkey.dsa->p, from->pkey.dsa->p) ||
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!dup_bn_into(&to->pkey.dsa->q, from->pkey.dsa->q) ||
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!dup_bn_into(&to->pkey.dsa->g, from->pkey.dsa->g)) {
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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 dsa_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b) {
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return BN_cmp(a->pkey.dsa->p, b->pkey.dsa->p) == 0 &&
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BN_cmp(a->pkey.dsa->q, b->pkey.dsa->q) == 0 &&
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BN_cmp(a->pkey.dsa->g, b->pkey.dsa->g) == 0;
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}
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static int dsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b) {
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return BN_cmp(b->pkey.dsa->pub_key, a->pkey.dsa->pub_key) == 0;
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}
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static void int_dsa_free(EVP_PKEY *pkey) { DSA_free(pkey->pkey.dsa); }
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const EVP_PKEY_ASN1_METHOD dsa_asn1_meth = {
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EVP_PKEY_DSA,
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// 1.2.840.10040.4.1
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{0x2a, 0x86, 0x48, 0xce, 0x38, 0x04, 0x01}, 7,
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dsa_pub_decode,
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dsa_pub_encode,
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dsa_pub_cmp,
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dsa_priv_decode,
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dsa_priv_encode,
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NULL /* set_priv_raw */,
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NULL /* set_pub_raw */,
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NULL /* get_priv_raw */,
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NULL /* get_pub_raw */,
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NULL /* pkey_opaque */,
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int_dsa_size,
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dsa_bits,
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dsa_missing_parameters,
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dsa_copy_parameters,
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dsa_cmp_parameters,
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int_dsa_free,
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};
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