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- /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
- * project 2000.
- */
- /* ====================================================================
- * Copyright (c) 2000-2005 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/dh.h>
-
- #include <assert.h>
- #include <limits.h>
-
- #include <openssl/bn.h>
- #include <openssl/bytestring.h>
- #include <openssl/err.h>
-
- #include "../bytestring/internal.h"
-
-
- static int parse_integer(CBS *cbs, BIGNUM **out) {
- assert(*out == NULL);
- *out = BN_new();
- if (*out == NULL) {
- return 0;
- }
- return BN_parse_asn1_unsigned(cbs, *out);
- }
-
- static int marshal_integer(CBB *cbb, BIGNUM *bn) {
- if (bn == NULL) {
- /* A DH object may be missing some components. */
- OPENSSL_PUT_ERROR(DH, ERR_R_PASSED_NULL_PARAMETER);
- return 0;
- }
- return BN_marshal_asn1(cbb, bn);
- }
-
- DH *DH_parse_parameters(CBS *cbs) {
- DH *ret = DH_new();
- if (ret == NULL) {
- return NULL;
- }
-
- CBS child;
- if (!CBS_get_asn1(cbs, &child, CBS_ASN1_SEQUENCE) ||
- !parse_integer(&child, &ret->p) ||
- !parse_integer(&child, &ret->g)) {
- goto err;
- }
-
- uint64_t priv_length;
- if (CBS_len(&child) != 0) {
- if (!CBS_get_asn1_uint64(&child, &priv_length) ||
- priv_length > UINT_MAX) {
- goto err;
- }
- ret->priv_length = (unsigned)priv_length;
- }
-
- if (CBS_len(&child) != 0) {
- goto err;
- }
-
- return ret;
-
- err:
- OPENSSL_PUT_ERROR(DH, DH_R_DECODE_ERROR);
- DH_free(ret);
- return NULL;
- }
-
- int DH_marshal_parameters(CBB *cbb, const DH *dh) {
- CBB child;
- if (!CBB_add_asn1(cbb, &child, CBS_ASN1_SEQUENCE) ||
- !marshal_integer(&child, dh->p) ||
- !marshal_integer(&child, dh->g) ||
- (dh->priv_length != 0 &&
- !CBB_add_asn1_uint64(&child, dh->priv_length)) ||
- !CBB_flush(cbb)) {
- OPENSSL_PUT_ERROR(DH, DH_R_ENCODE_ERROR);
- return 0;
- }
- return 1;
- }
-
- DH *d2i_DHparams(DH **out, const uint8_t **inp, long len) {
- if (len < 0) {
- return NULL;
- }
- CBS cbs;
- CBS_init(&cbs, *inp, (size_t)len);
- DH *ret = DH_parse_parameters(&cbs);
- if (ret == NULL) {
- return NULL;
- }
- if (out != NULL) {
- DH_free(*out);
- *out = ret;
- }
- *inp = CBS_data(&cbs);
- return ret;
- }
-
- int i2d_DHparams(const DH *in, uint8_t **outp) {
- CBB cbb;
- if (!CBB_init(&cbb, 0) ||
- !DH_marshal_parameters(&cbb, in)) {
- CBB_cleanup(&cbb);
- return -1;
- }
- return CBB_finish_i2d(&cbb, outp);
- }
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