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2017-02-25 23:55:24 +01:00
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openssl-1.0.2f/crypto/dh/dh_asn1.c Normal file
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/* dh_asn1.c */
/*
* 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 <stdio.h>
#include "cryptlib.h"
#include <openssl/bn.h>
#include <openssl/dh.h>
#include <openssl/objects.h>
#include <openssl/asn1t.h>
/* Override the default free and new methods */
static int dh_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
void *exarg)
{
if (operation == ASN1_OP_NEW_PRE) {
*pval = (ASN1_VALUE *)DH_new();
if (*pval)
return 2;
return 0;
} else if (operation == ASN1_OP_FREE_PRE) {
DH_free((DH *)*pval);
*pval = NULL;
return 2;
}
return 1;
}
ASN1_SEQUENCE_cb(DHparams, dh_cb) = {
ASN1_SIMPLE(DH, p, BIGNUM),
ASN1_SIMPLE(DH, g, BIGNUM),
ASN1_OPT(DH, length, ZLONG),
} ASN1_SEQUENCE_END_cb(DH, DHparams)
IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DH, DHparams, DHparams)
/*
* Internal only structures for handling X9.42 DH: this gets translated to or
* from a DH structure straight away.
*/
typedef struct {
ASN1_BIT_STRING *seed;
BIGNUM *counter;
} int_dhvparams;
typedef struct {
BIGNUM *p;
BIGNUM *q;
BIGNUM *g;
BIGNUM *j;
int_dhvparams *vparams;
} int_dhx942_dh;
ASN1_SEQUENCE(DHvparams) = {
ASN1_SIMPLE(int_dhvparams, seed, ASN1_BIT_STRING),
ASN1_SIMPLE(int_dhvparams, counter, BIGNUM)
} ASN1_SEQUENCE_END_name(int_dhvparams, DHvparams)
ASN1_SEQUENCE(DHxparams) = {
ASN1_SIMPLE(int_dhx942_dh, p, BIGNUM),
ASN1_SIMPLE(int_dhx942_dh, g, BIGNUM),
ASN1_SIMPLE(int_dhx942_dh, q, BIGNUM),
ASN1_OPT(int_dhx942_dh, j, BIGNUM),
ASN1_OPT(int_dhx942_dh, vparams, DHvparams),
} ASN1_SEQUENCE_END_name(int_dhx942_dh, DHxparams)
int_dhx942_dh *d2i_int_dhx(int_dhx942_dh **a,
const unsigned char **pp, long length);
int i2d_int_dhx(const int_dhx942_dh *a, unsigned char **pp);
IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(int_dhx942_dh, DHxparams, int_dhx)
/* Application leve function: read in X9.42 DH parameters into DH structure */
DH *d2i_DHxparams(DH **a, const unsigned char **pp, long length)
{
int_dhx942_dh *dhx = NULL;
DH *dh = NULL;
dh = DH_new();
if (!dh)
return NULL;
dhx = d2i_int_dhx(NULL, pp, length);
if (!dhx) {
DH_free(dh);
return NULL;
}
if (a) {
if (*a)
DH_free(*a);
*a = dh;
}
dh->p = dhx->p;
dh->q = dhx->q;
dh->g = dhx->g;
dh->j = dhx->j;
if (dhx->vparams) {
dh->seed = dhx->vparams->seed->data;
dh->seedlen = dhx->vparams->seed->length;
dh->counter = dhx->vparams->counter;
dhx->vparams->seed->data = NULL;
ASN1_BIT_STRING_free(dhx->vparams->seed);
OPENSSL_free(dhx->vparams);
dhx->vparams = NULL;
}
OPENSSL_free(dhx);
return dh;
}
int i2d_DHxparams(const DH *dh, unsigned char **pp)
{
int_dhx942_dh dhx;
int_dhvparams dhv;
ASN1_BIT_STRING bs;
dhx.p = dh->p;
dhx.g = dh->g;
dhx.q = dh->q;
dhx.j = dh->j;
if (dh->counter && dh->seed && dh->seedlen > 0) {
bs.flags = ASN1_STRING_FLAG_BITS_LEFT;
bs.data = dh->seed;
bs.length = dh->seedlen;
dhv.seed = &bs;
dhv.counter = dh->counter;
dhx.vparams = &dhv;
} else
dhx.vparams = NULL;
return i2d_int_dhx(&dhx, pp);
}