138 lines
3.6 KiB
C
138 lines
3.6 KiB
C
/*
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* Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include "internal/cryptlib.h"
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#include <openssl/bn.h>
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#include "dh_locl.h"
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#include <openssl/objects.h>
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#include <openssl/asn1t.h>
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/* Override the default free and new methods */
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static int dh_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
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void *exarg)
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{
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if (operation == ASN1_OP_NEW_PRE) {
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*pval = (ASN1_VALUE *)DH_new();
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if (*pval != NULL)
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return 2;
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return 0;
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} else if (operation == ASN1_OP_FREE_PRE) {
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DH_free((DH *)*pval);
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*pval = NULL;
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return 2;
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}
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return 1;
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}
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ASN1_SEQUENCE_cb(DHparams, dh_cb) = {
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ASN1_SIMPLE(DH, p, BIGNUM),
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ASN1_SIMPLE(DH, g, BIGNUM),
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ASN1_OPT(DH, length, ZLONG),
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} ASN1_SEQUENCE_END_cb(DH, DHparams)
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IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DH, DHparams, DHparams)
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/*
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* Internal only structures for handling X9.42 DH: this gets translated to or
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* from a DH structure straight away.
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*/
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typedef struct {
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ASN1_BIT_STRING *seed;
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BIGNUM *counter;
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} int_dhvparams;
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typedef struct {
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BIGNUM *p;
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BIGNUM *q;
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BIGNUM *g;
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BIGNUM *j;
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int_dhvparams *vparams;
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} int_dhx942_dh;
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ASN1_SEQUENCE(DHvparams) = {
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ASN1_SIMPLE(int_dhvparams, seed, ASN1_BIT_STRING),
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ASN1_SIMPLE(int_dhvparams, counter, BIGNUM)
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} static_ASN1_SEQUENCE_END_name(int_dhvparams, DHvparams)
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ASN1_SEQUENCE(DHxparams) = {
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ASN1_SIMPLE(int_dhx942_dh, p, BIGNUM),
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ASN1_SIMPLE(int_dhx942_dh, g, BIGNUM),
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ASN1_SIMPLE(int_dhx942_dh, q, BIGNUM),
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ASN1_OPT(int_dhx942_dh, j, BIGNUM),
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ASN1_OPT(int_dhx942_dh, vparams, DHvparams),
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} static_ASN1_SEQUENCE_END_name(int_dhx942_dh, DHxparams)
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int_dhx942_dh *d2i_int_dhx(int_dhx942_dh **a,
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const unsigned char **pp, long length);
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int i2d_int_dhx(const int_dhx942_dh *a, unsigned char **pp);
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IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(int_dhx942_dh, DHxparams, int_dhx)
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/* Application public function: read in X9.42 DH parameters into DH structure */
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DH *d2i_DHxparams(DH **a, const unsigned char **pp, long length)
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{
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int_dhx942_dh *dhx = NULL;
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DH *dh = NULL;
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dh = DH_new();
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if (dh == NULL)
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return NULL;
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dhx = d2i_int_dhx(NULL, pp, length);
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if (dhx == NULL) {
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DH_free(dh);
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return NULL;
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}
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if (a) {
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DH_free(*a);
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*a = dh;
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}
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dh->p = dhx->p;
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dh->q = dhx->q;
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dh->g = dhx->g;
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dh->j = dhx->j;
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if (dhx->vparams) {
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dh->seed = dhx->vparams->seed->data;
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dh->seedlen = dhx->vparams->seed->length;
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dh->counter = dhx->vparams->counter;
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dhx->vparams->seed->data = NULL;
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ASN1_BIT_STRING_free(dhx->vparams->seed);
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OPENSSL_free(dhx->vparams);
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dhx->vparams = NULL;
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}
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OPENSSL_free(dhx);
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return dh;
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}
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int i2d_DHxparams(const DH *dh, unsigned char **pp)
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{
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int_dhx942_dh dhx;
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int_dhvparams dhv;
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ASN1_BIT_STRING bs;
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dhx.p = dh->p;
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dhx.g = dh->g;
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dhx.q = dh->q;
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dhx.j = dh->j;
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if (dh->counter && dh->seed && dh->seedlen > 0) {
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bs.flags = ASN1_STRING_FLAG_BITS_LEFT;
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bs.data = dh->seed;
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bs.length = dh->seedlen;
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dhv.seed = &bs;
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dhv.counter = dh->counter;
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dhx.vparams = &dhv;
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} else
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dhx.vparams = NULL;
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return i2d_int_dhx(&dhx, pp);
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}
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