115 lines
2.4 KiB
C
115 lines
2.4 KiB
C
// Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project 2000.
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// Copyright (c) 2000-2005 The OpenSSL Project. All rights reserved.
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// SPDX-License-Identifier: Apache-2.0
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#include <openssl/dh.h>
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#include <assert.h>
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#include <limits.h>
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#include <openssl/bn.h>
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#include <openssl/bytestring.h>
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#include <openssl/err.h>
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#include "../bytestring/internal.h"
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#include "../fipsmodule/dh/internal.h"
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static int parse_integer(CBS *cbs, BIGNUM **out) {
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assert(*out == NULL);
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*out = BN_new();
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if (*out == NULL) {
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return 0;
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}
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return BN_parse_asn1_unsigned(cbs, *out);
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}
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static int marshal_integer(CBB *cbb, BIGNUM *bn) {
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if (bn == NULL) {
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// A DH object may be missing some components.
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OPENSSL_PUT_ERROR(DH, ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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return BN_marshal_asn1(cbb, bn);
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}
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DH *DH_parse_parameters(CBS *cbs) {
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DH *ret = DH_new();
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if (ret == NULL) {
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return NULL;
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}
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CBS child;
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if (!CBS_get_asn1(cbs, &child, CBS_ASN1_SEQUENCE) ||
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!parse_integer(&child, &ret->p) ||
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!parse_integer(&child, &ret->g)) {
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goto err;
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}
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uint64_t priv_length;
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if (CBS_len(&child) != 0) {
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if (!CBS_get_asn1_uint64(&child, &priv_length) ||
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priv_length > UINT_MAX) {
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goto err;
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}
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ret->priv_length = (unsigned)priv_length;
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}
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if (CBS_len(&child) != 0) {
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goto err;
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}
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if (!dh_check_params_fast(ret)) {
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goto err;
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}
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return ret;
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err:
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OPENSSL_PUT_ERROR(DH, DH_R_DECODE_ERROR);
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DH_free(ret);
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return NULL;
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}
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int DH_marshal_parameters(CBB *cbb, const DH *dh) {
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CBB child;
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if (!CBB_add_asn1(cbb, &child, CBS_ASN1_SEQUENCE) ||
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!marshal_integer(&child, dh->p) ||
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!marshal_integer(&child, dh->g) ||
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(dh->priv_length != 0 &&
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!CBB_add_asn1_uint64(&child, dh->priv_length)) ||
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!CBB_flush(cbb)) {
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OPENSSL_PUT_ERROR(DH, DH_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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DH *d2i_DHparams(DH **out, const uint8_t **inp, long len) {
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if (len < 0) {
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return NULL;
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}
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CBS cbs;
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CBS_init(&cbs, *inp, (size_t)len);
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DH *ret = DH_parse_parameters(&cbs);
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if (ret == NULL) {
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return NULL;
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}
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if (out != NULL) {
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DH_free(*out);
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*out = ret;
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}
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*inp = CBS_data(&cbs);
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return ret;
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}
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int i2d_DHparams(const DH *in, uint8_t **outp) {
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CBB cbb;
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if (!CBB_init(&cbb, 0) ||
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!DH_marshal_parameters(&cbb, in)) {
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CBB_cleanup(&cbb);
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return -1;
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}
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return CBB_finish_i2d(&cbb, outp);
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}
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