[thirdparty/openssl.git] / crypto / dh / dh_asn1.c

/* 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)

DH *DHparams_dup(DH *dh)
	{
	return ASN1_item_dup(ASN1_ITEM_rptr(DHparams), dh);
	}

/* 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);
	}
Commit	Line	Data
9d6b1ce6	1	/* dh_asn1.c */
2e597528	2	/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
9d6b1ce6	3	* project 2000.
e76f935e DSH	4	*/
e76f935e DSH	5	/* ====================================================================
24484759	6	* Copyright (c) 2000-2005 The OpenSSL Project. All rights reserved.
e76f935e DSH	7	*
	8	* Redistribution and use in source and binary forms, with or without
	9	* modification, are permitted provided that the following conditions
	10	* are met:
	11	*
	12	* 1. Redistributions of source code must retain the above copyright
	13	* notice, this list of conditions and the following disclaimer.
	14	*
	15	* 2. Redistributions in binary form must reproduce the above copyright
	16	* notice, this list of conditions and the following disclaimer in
	17	* the documentation and/or other materials provided with the
	18	* distribution.
	19	*
	20	* 3. All advertising materials mentioning features or use of this
	21	* software must display the following acknowledgment:
	22	* "This product includes software developed by the OpenSSL Project
	23	* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
	24	*
	25	* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
	26	* endorse or promote products derived from this software without
	27	* prior written permission. For written permission, please contact
	28	* licensing@OpenSSL.org.
	29	*
	30	* 5. Products derived from this software may not be called "OpenSSL"
	31	* nor may "OpenSSL" appear in their names without prior written
	32	* permission of the OpenSSL Project.
	33	*
	34	* 6. Redistributions of any form whatsoever must retain the following
	35	* acknowledgment:
	36	* "This product includes software developed by the OpenSSL Project
	37	* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
	38	*
	39	* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
	40	* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	41	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	42	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
	43	* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	44	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	45	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	46	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	47	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	48	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	49	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
	50	* OF THE POSSIBILITY OF SUCH DAMAGE.
	51	* ====================================================================
	52	*
	53	* This product includes cryptographic software written by Eric Young
	54	* (eay@cryptsoft.com). This product includes software written by Tim
	55	* Hudson (tjh@cryptsoft.com).
	56	*
	57	*/
	58
	59	#include <stdio.h>
	60	#include "cryptlib.h"
9d6b1ce6 DSH	61	#include <openssl/bn.h>
	62	#include <openssl/dh.h>
	63	#include <openssl/objects.h>
	64	#include <openssl/asn1t.h>
e76f935e	65
9d6b1ce6	66	/* Override the default free and new methods */
24484759 DSH	67	static int dh_cb(int operation, ASN1_VALUE *pval, const ASN1_ITEM it,
24484759 DSH	68	void *exarg)
e76f935e	69	{
9d6b1ce6 DSH	70	if(operation == ASN1_OP_NEW_PRE) {
	71	pval = (ASN1_VALUE )DH_new();
	72	if(*pval) return 2;
	73	return 0;
	74	} else if(operation == ASN1_OP_FREE_PRE) {
	75	DH_free((DH )pval);
	76	*pval = NULL;
	77	return 2;
	78	}
	79	return 1;
e76f935e DSH	80	}
e76f935e DSH	81
9d6b1ce6 DSH	82	ASN1_SEQUENCE_cb(DHparams, dh_cb) = {
	83	ASN1_SIMPLE(DH, p, BIGNUM),
	84	ASN1_SIMPLE(DH, g, BIGNUM),
	85	ASN1_OPT(DH, length, ZLONG),
d339187b	86	} ASN1_SEQUENCE_END_cb(DH, DHparams)
9d6b1ce6 DSH	87
9d6b1ce6 DSH	88	IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DH, DHparams, DHparams)
f4274da1 DSH	89
	90	DH DHparams_dup(DH dh)
	91	{
	92	return ASN1_item_dup(ASN1_ITEM_rptr(DHparams), dh);
	93	}
afb14cda DSH	94
	95	/* Internal only structures for handling X9.42 DH: this gets translated
	96	* to or from a DH structure straight away.
	97	*/
	98
	99	typedef struct
	100	{
	101	ASN1_BIT_STRING *seed;
	102	BIGNUM *counter;
	103	} int_dhvparams;
	104
	105	typedef struct
	106	{
	107	BIGNUM *p;
	108	BIGNUM *q;
	109	BIGNUM *g;
	110	BIGNUM *j;
	111	int_dhvparams *vparams;
	112	} int_dhx942_dh;
	113
	114	ASN1_SEQUENCE(DHvparams) = {
	115	ASN1_SIMPLE(int_dhvparams, seed, ASN1_BIT_STRING),
	116	ASN1_SIMPLE(int_dhvparams, counter, BIGNUM)
	117	} ASN1_SEQUENCE_END_name(int_dhvparams, DHvparams)
	118
	119	ASN1_SEQUENCE(DHxparams) = {
	120	ASN1_SIMPLE(int_dhx942_dh, p, BIGNUM),
	121	ASN1_SIMPLE(int_dhx942_dh, g, BIGNUM),
	122	ASN1_SIMPLE(int_dhx942_dh, q, BIGNUM),
	123	ASN1_OPT(int_dhx942_dh, j, BIGNUM),
	124	ASN1_OPT(int_dhx942_dh, vparams, DHvparams),
	125	} ASN1_SEQUENCE_END_name(int_dhx942_dh, DHxparams)
	126
	127	int_dhx942_dh * d2i_int_dhx(int_dhx942_dh **a,
	128	const unsigned char **pp, long length);
	129	int i2d_int_dhx(const int_dhx942_dh a,unsigned char *pp);
	130
	131	IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(int_dhx942_dh, DHxparams, int_dhx)
	132
	133	/* Application leve function: read in X9.42 DH parameters into DH structure */
	134
	135	DH * d2i_DHxparams(DH a,const unsigned char pp, long length)
	136	{
	137	int_dhx942_dh *dhx = NULL;
	138	DH *dh = NULL;
	139	dh = DH_new();
	140	if (!dh)
	141	return NULL;
	142	dhx = d2i_int_dhx(NULL, pp, length);
	143	if (!dhx)
	144	{
	145	DH_free(dh);
	146	return NULL;
	147	}
	148
	149	if (a)
	150	{
	151	if (*a)
	152	DH_free(*a);
	153	*a = dh;
	154	}
	155
	156	dh->p = dhx->p;
	157	dh->q = dhx->q;
158	dh->g = dhx->g;
159	dh->j = dhx->j;
160
161	if (dhx->vparams)
162	{
163	dh->seed = dhx->vparams->seed->data;
164	dh->seedlen = dhx->vparams->seed->length;
165	dh->counter = dhx->vparams->counter;
166	dhx->vparams->seed->data = NULL;
167	ASN1_BIT_STRING_free(dhx->vparams->seed);
168	OPENSSL_free(dhx->vparams);
169	dhx->vparams = NULL;
170	}
171
172	OPENSSL_free(dhx);
173	return dh;
174	}
175
176	int i2d_DHxparams(const DH dh,unsigned char *pp)
177	{
178	int_dhx942_dh dhx;
179	int_dhvparams dhv;
180	ASN1_BIT_STRING bs;
181	dhx.p = dh->p;
182	dhx.g = dh->g;
183	dhx.q = dh->q;
184	dhx.j = dh->j;
185	if (dh->counter && dh->seed && dh->seedlen > 0)
186	{
187	bs.flags = ASN1_STRING_FLAG_BITS_LEFT;
188	bs.data = dh->seed;
189	bs.length = dh->seedlen;
190	dhv.seed = &bs;
191	dhv.counter = dh->counter;
192	dhx.vparams = &dhv;
193	}
194	else
195	dhx.vparams = NULL;
196
197	return i2d_int_dhx(&dhx, pp);
198	}