- /* 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/digest.h>
- #include <openssl/bn.h>
- #include <openssl/bytestring.h>
- #include <openssl/dsa.h>
- #include <openssl/err.h>
-
- #include "internal.h"
-
-
- static int dsa_pub_decode(EVP_PKEY *out, CBS *params, CBS *key) {
- /* See RFC 3279, section 2.3.2. */
-
- /* Parameters may or may not be present. */
- DSA *dsa;
- if (CBS_len(params) == 0) {
- dsa = DSA_new();
- if (dsa == NULL) {
- return 0;
- }
- } else {
- dsa = DSA_parse_parameters(params);
- if (dsa == NULL || CBS_len(params) != 0) {
- OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR);
- goto err;
- }
- }
-
- dsa->pub_key = BN_new();
- if (dsa->pub_key == NULL) {
- goto err;
- }
-
- if (!BN_parse_asn1_unsigned(key, dsa->pub_key) ||
- CBS_len(key) != 0) {
- OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR);
- goto err;
- }
-
- EVP_PKEY_assign_DSA(out, dsa);
- return 1;
-
- err:
- DSA_free(dsa);
- return 0;
- }
-
- static int dsa_pub_encode(CBB *out, const EVP_PKEY *key) {
- const DSA *dsa = key->pkey.dsa;
- const int has_params = dsa->p != NULL && dsa->q != NULL && dsa->g != NULL;
-
- /* 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, dsa_asn1_meth.oid, dsa_asn1_meth.oid_len) ||
- (has_params &&
- !DSA_marshal_parameters(&algorithm, dsa)) ||
- !CBB_add_asn1(&spki, &key_bitstring, CBS_ASN1_BITSTRING) ||
- !CBB_add_u8(&key_bitstring, 0 /* padding */) ||
- !BN_marshal_asn1(&key_bitstring, dsa->pub_key) ||
- !CBB_flush(out)) {
- OPENSSL_PUT_ERROR(EVP, EVP_R_ENCODE_ERROR);
- return 0;
- }
-
- return 1;
- }
-
- static int dsa_priv_decode(EVP_PKEY *out, CBS *params, CBS *key) {
- /* See PKCS#11, v2.40, section 2.5. */
-
- /* Decode parameters. */
- BN_CTX *ctx = NULL;
- DSA *dsa = DSA_parse_parameters(params);
- if (dsa == NULL || CBS_len(params) != 0) {
- OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR);
- goto err;
- }
-
- dsa->priv_key = BN_new();
- dsa->pub_key = BN_new();
- if (dsa->priv_key == NULL || dsa->pub_key == NULL) {
- goto err;
- }
-
- /* Decode the key. */
- if (!BN_parse_asn1_unsigned(key, dsa->priv_key) ||
- CBS_len(key) != 0) {
- OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR);
- goto err;
- }
-
- /* Calculate the public key. */
- ctx = BN_CTX_new();
- if (ctx == NULL ||
- !BN_mod_exp(dsa->pub_key, dsa->g, dsa->priv_key, dsa->p, ctx)) {
- goto err;
- }
-
- BN_CTX_free(ctx);
- EVP_PKEY_assign_DSA(out, dsa);
- return 1;
-
- err:
- BN_CTX_free(ctx);
- DSA_free(dsa);
- return 0;
- }
-
- static int dsa_priv_encode(CBB *out, const EVP_PKEY *key) {
- const DSA *dsa = key->pkey.dsa;
- if (dsa == NULL || dsa->priv_key == NULL) {
- OPENSSL_PUT_ERROR(EVP, EVP_R_MISSING_PARAMETERS);
- return 0;
- }
-
- /* See PKCS#11, v2.40, section 2.5. */
- 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, dsa_asn1_meth.oid, dsa_asn1_meth.oid_len) ||
- !DSA_marshal_parameters(&algorithm, dsa) ||
- !CBB_add_asn1(&pkcs8, &private_key, CBS_ASN1_OCTETSTRING) ||
- !BN_marshal_asn1(&private_key, dsa->priv_key) ||
- !CBB_flush(out)) {
- OPENSSL_PUT_ERROR(EVP, EVP_R_ENCODE_ERROR);
- return 0;
- }
-
- return 1;
- }
-
- static int int_dsa_size(const EVP_PKEY *pkey) {
- return DSA_size(pkey->pkey.dsa);
- }
-
- static int dsa_bits(const EVP_PKEY *pkey) {
- return BN_num_bits(pkey->pkey.dsa->p);
- }
-
- static int dsa_missing_parameters(const EVP_PKEY *pkey) {
- DSA *dsa;
- dsa = pkey->pkey.dsa;
- if (dsa->p == NULL || dsa->q == NULL || dsa->g == NULL) {
- return 1;
- }
- return 0;
- }
-
- static int dup_bn_into(BIGNUM **out, BIGNUM *src) {
- BIGNUM *a;
-
- a = BN_dup(src);
- if (a == NULL) {
- return 0;
- }
- BN_free(*out);
- *out = a;
-
- return 1;
- }
-
- static int dsa_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from) {
- if (!dup_bn_into(&to->pkey.dsa->p, from->pkey.dsa->p) ||
- !dup_bn_into(&to->pkey.dsa->q, from->pkey.dsa->q) ||
- !dup_bn_into(&to->pkey.dsa->g, from->pkey.dsa->g)) {
- return 0;
- }
-
- return 1;
- }
-
- static int dsa_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b) {
- return BN_cmp(a->pkey.dsa->p, b->pkey.dsa->p) == 0 &&
- BN_cmp(a->pkey.dsa->q, b->pkey.dsa->q) == 0 &&
- BN_cmp(a->pkey.dsa->g, b->pkey.dsa->g) == 0;
- }
-
- static int dsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b) {
- return BN_cmp(b->pkey.dsa->pub_key, a->pkey.dsa->pub_key) == 0;
- }
-
- static void int_dsa_free(EVP_PKEY *pkey) { DSA_free(pkey->pkey.dsa); }
-
- const EVP_PKEY_ASN1_METHOD dsa_asn1_meth = {
- EVP_PKEY_DSA,
- /* 1.2.840.10040.4.1 */
- {0x2a, 0x86, 0x48, 0xce, 0x38, 0x04, 0x01}, 7,
-
- dsa_pub_decode,
- dsa_pub_encode,
- dsa_pub_cmp,
-
- dsa_priv_decode,
- dsa_priv_encode,
-
- NULL /* pkey_opaque */,
- NULL /* pkey_supports_digest */,
-
- int_dsa_size,
- dsa_bits,
-
- dsa_missing_parameters,
- dsa_copy_parameters,
- dsa_cmp_parameters,
-
- int_dsa_free,
- };
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