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

/* crypto/dh/dh_lib.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * 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 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 acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS 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 AUTHOR OR 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.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include "cryptlib.h"
#include <openssl/bn.h>
#include <openssl/dh.h>
#include <openssl/engine.h>

const char *DH_version="Diffie-Hellman" OPENSSL_VERSION_PTEXT;

static const DH_METHOD *default_DH_method = NULL;
static int dh_meth_num = 0;
static STACK_OF(CRYPTO_EX_DATA_FUNCS) *dh_meth = NULL;

void DH_set_default_openssl_method(const DH_METHOD *meth)
{
	ENGINE *e;
	/* We'll need to notify the "openssl" ENGINE of this
	 * change too. We won't bother locking things down at
	 * our end as there was never any locking in these
	 * functions! */
	if(default_DH_method != meth)
		{
		default_DH_method = meth;
		e = ENGINE_by_id("openssl");
		if(e)
			{
			ENGINE_set_DH(e, meth);
			ENGINE_free(e);
			}
		}
}

const DH_METHOD *DH_get_default_openssl_method(void)
{
	if(!default_DH_method) default_DH_method = DH_OpenSSL();
	return default_DH_method;
}

#if 0
DH_METHOD *DH_set_method(DH *dh, DH_METHOD *meth)
{
        DH_METHOD *mtmp;
        mtmp = dh->meth;
        if (mtmp->finish) mtmp->finish(dh);
        dh->meth = meth;
        if (meth->init) meth->init(dh);
        return mtmp;
}
#else
int DH_set_method(DH *dh, ENGINE *engine)
{
	ENGINE *mtmp;
	const DH_METHOD *meth;
	mtmp = dh->engine;
	meth = ENGINE_get_DH(mtmp);
	if (!ENGINE_init(engine))
		return 0;
	if (meth->finish) meth->finish(dh);
	dh->engine= engine;
	meth = ENGINE_get_DH(engine);
	if (meth->init) meth->init(dh);
	/* SHOULD ERROR CHECK THIS!!! */
	ENGINE_finish(mtmp);
	return 1;
}
#endif

DH *DH_new(void)
{
	return DH_new_method(NULL);
}

#if 0
DH *DH_new_method(DH_METHOD *meth)
#else
DH *DH_new_method(ENGINE *engine)
#endif
	{
	const DH_METHOD *meth;
	DH *ret;
	ret=(DH *)OPENSSL_malloc(sizeof(DH));

	if (ret == NULL)
		{
		DHerr(DH_F_DH_NEW,ERR_R_MALLOC_FAILURE);
		return(NULL);
		}

	if (engine)
		{
		if(ENGINE_init(engine))
			ret->engine = engine;
		else 
			ret->engine = NULL;
		}
	else
		ret->engine=ENGINE_get_default_DH();
	if(ret->engine == NULL)
		{
		DHerr(DH_F_DH_NEW,ERR_LIB_ENGINE);
		OPENSSL_free(ret);
		return NULL;
		}
	meth = ENGINE_get_DH(ret->engine);
	ret->pad=0;
	ret->version=0;
	ret->p=NULL;
	ret->g=NULL;
	ret->length=0;
	ret->pub_key=NULL;
	ret->priv_key=NULL;
	ret->q=NULL;
	ret->j=NULL;
	ret->seed = NULL;
	ret->seedlen = 0;
	ret->counter = NULL;
	ret->method_mont_p=NULL;
	ret->references = 1;
	ret->flags=meth->flags;
	CRYPTO_new_ex_data(dh_meth,ret,&ret->ex_data);
	if ((meth->init != NULL) && !meth->init(ret))
		{
		CRYPTO_free_ex_data(dh_meth,ret,&ret->ex_data);
		OPENSSL_free(ret);
		ret=NULL;
		}
	return(ret);
	}

void DH_free(DH *r)
	{
	const DH_METHOD *meth;
	int i;
	if(r == NULL) return;
	i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DH);
#ifdef REF_PRINT
	REF_PRINT("DH",r);
#endif
	if (i > 0) return;
#ifdef REF_CHECK
	if (i < 0)
		{
		fprintf(stderr,"DH_free, bad reference count\n");
		abort();
	}
#endif

	meth = ENGINE_get_DH(r->engine);
	if(meth->finish) meth->finish(r);
	ENGINE_finish(r->engine);

	CRYPTO_free_ex_data(dh_meth, r, &r->ex_data);

	if (r->p != NULL) BN_clear_free(r->p);
	if (r->g != NULL) BN_clear_free(r->g);
	if (r->q != NULL) BN_clear_free(r->q);
	if (r->j != NULL) BN_clear_free(r->j);
	if (r->seed) OPENSSL_free(r->seed);
	if (r->counter != NULL) BN_clear_free(r->counter);
	if (r->pub_key != NULL) BN_clear_free(r->pub_key);
	if (r->priv_key != NULL) BN_clear_free(r->priv_key);
	OPENSSL_free(r);
	}

int DH_up(DH *r)
	{
	int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DH);
#ifdef REF_PRINT
	REF_PRINT("DH",r);
#endif
#ifdef REF_CHECK
	if (i < 2)
		{
		fprintf(stderr, "DH_up, bad reference count\n");
		abort();
		}
#endif
	return ((i > 1) ? 1 : 0);
	}

int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
	     CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
        {
	if(CRYPTO_get_ex_new_index(dh_meth_num, &dh_meth, argl, argp,
				new_func, dup_func, free_func) < 0)
		return -1;
	return (dh_meth_num++);
        }

int DH_set_ex_data(DH *d, int idx, void *arg)
	{
	return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
	}

void *DH_get_ex_data(DH *d, int idx)
	{
	return(CRYPTO_get_ex_data(&d->ex_data,idx));
	}

int DH_size(const DH *dh)
	{
	return(BN_num_bytes(dh->p));
	}
Commit	Line	Data
d02b48c6	1	/* crypto/dh/dh_lib.c */
58964a49	2	/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
d02b48c6 RE	3	* All rights reserved.
	4	*
	5	* This package is an SSL implementation written
	6	* by Eric Young (eay@cryptsoft.com).
	7	* The implementation was written so as to conform with Netscapes SSL.
	8	*
	9	* This library is free for commercial and non-commercial use as long as
	10	* the following conditions are aheared to. The following conditions
	11	* apply to all code found in this distribution, be it the RC4, RSA,
	12	* lhash, DES, etc., code; not just the SSL code. The SSL documentation
	13	* included with this distribution is covered by the same copyright terms
	14	* except that the holder is Tim Hudson (tjh@cryptsoft.com).
	15	*
	16	* Copyright remains Eric Young's, and as such any Copyright notices in
	17	* the code are not to be removed.
	18	* If this package is used in a product, Eric Young should be given attribution
	19	* as the author of the parts of the library used.
	20	* This can be in the form of a textual message at program startup or
	21	* in documentation (online or textual) provided with the package.
	22	*
	23	* Redistribution and use in source and binary forms, with or without
	24	* modification, are permitted provided that the following conditions
	25	* are met:
	26	* 1. Redistributions of source code must retain the copyright
	27	* notice, this list of conditions and the following disclaimer.
	28	* 2. Redistributions in binary form must reproduce the above copyright
	29	* notice, this list of conditions and the following disclaimer in the
	30	* documentation and/or other materials provided with the distribution.
	31	* 3. All advertising materials mentioning features or use of this software
	32	* must display the following acknowledgement:
	33	* "This product includes cryptographic software written by
	34	* Eric Young (eay@cryptsoft.com)"
	35	* The word 'cryptographic' can be left out if the rouines from the library
	36	* being used are not cryptographic related :-).
	37	* 4. If you include any Windows specific code (or a derivative thereof) from
	38	* the apps directory (application code) you must include an acknowledgement:
	39	* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
	40	*
	41	* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
	42	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	43	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	44	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	45	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	46	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	47	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	48	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	49	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	50	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	51	* SUCH DAMAGE.
	52	*
	53	* The licence and distribution terms for any publically available version or
	54	* derivative of this code cannot be changed. i.e. this code cannot simply be
	55	* copied and put under another distribution licence
	56	* [including the GNU Public Licence.]
	57	*/
	58
	59	#include <stdio.h>
	60	#include "cryptlib.h"
ec577822 BM	61	#include <openssl/bn.h>
ec577822 BM	62	#include <openssl/dh.h>
5270e702	63	#include <openssl/engine.h>
d02b48c6	64
e778802f	65	const char *DH_version="Diffie-Hellman" OPENSSL_VERSION_PTEXT;
d02b48c6	66
3a644582	67	static const DH_METHOD *default_DH_method = NULL;
13066cee	68	static int dh_meth_num = 0;
dd9d233e	69	static STACK_OF(CRYPTO_EX_DATA_FUNCS) *dh_meth = NULL;
13066cee	70
f971ccb2	71	void DH_set_default_openssl_method(const DH_METHOD *meth)
13066cee	72	{
5270e702 RL	73	ENGINE *e;
	74	/* We'll need to notify the "openssl" ENGINE of this
	75	* change too. We won't bother locking things down at
	76	* our end as there was never any locking in these
	77	* functions! */
	78	if(default_DH_method != meth)
	79	{
	80	default_DH_method = meth;
	81	e = ENGINE_by_id("openssl");
	82	if(e)
	83	{
	84	ENGINE_set_DH(e, meth);
	85	ENGINE_free(e);
	86	}
	87	}
13066cee DSH	88	}
13066cee DSH	89
f971ccb2	90	const DH_METHOD *DH_get_default_openssl_method(void)
13066cee DSH	91	{
	92	if(!default_DH_method) default_DH_method = DH_OpenSSL();
	93	return default_DH_method;
	94	}
	95
5270e702	96	#if 0
13066cee DSH	97	DH_METHOD DH_set_method(DH dh, DH_METHOD *meth)
	98	{
	99	DH_METHOD *mtmp;
	100	mtmp = dh->meth;
	101	if (mtmp->finish) mtmp->finish(dh);
	102	dh->meth = meth;
	103	if (meth->init) meth->init(dh);
	104	return mtmp;
	105	}
5270e702 RL	106	#else
	107	int DH_set_method(DH dh, ENGINE engine)
	108	{
	109	ENGINE *mtmp;
f971ccb2	110	const DH_METHOD *meth;
5270e702 RL	111	mtmp = dh->engine;
	112	meth = ENGINE_get_DH(mtmp);
	113	if (!ENGINE_init(engine))
	114	return 0;
	115	if (meth->finish) meth->finish(dh);
	116	dh->engine= engine;
	117	meth = ENGINE_get_DH(engine);
	118	if (meth->init) meth->init(dh);
	119	/* SHOULD ERROR CHECK THIS!!! */
	120	ENGINE_finish(mtmp);
	121	return 1;
	122	}
	123	#endif
13066cee	124
6b691a5c	125	DH *DH_new(void)
13066cee DSH	126	{
	127	return DH_new_method(NULL);
	128	}
	129
5270e702	130	#if 0
13066cee	131	DH DH_new_method(DH_METHOD meth)
5270e702 RL	132	#else
	133	DH DH_new_method(ENGINE engine)
	134	#endif
d02b48c6	135	{
f971ccb2	136	const DH_METHOD *meth;
d02b48c6	137	DH *ret;
26a3a48d	138	ret=(DH *)OPENSSL_malloc(sizeof(DH));
13066cee	139
d02b48c6 RE	140	if (ret == NULL)
	141	{
	142	DHerr(DH_F_DH_NEW,ERR_R_MALLOC_FAILURE);
	143	return(NULL);
	144	}
0c9de428 DSH	145
	146	if (engine)
	147	{
	148	if(ENGINE_init(engine))
	149	ret->engine = engine;
	150	else
	151	ret->engine = NULL;
	152	}
5270e702	153	else
0c9de428 DSH	154	ret->engine=ENGINE_get_default_DH();
0c9de428 DSH	155	if(ret->engine == NULL)
5270e702	156	{
0c9de428 DSH	157	DHerr(DH_F_DH_NEW,ERR_LIB_ENGINE);
	158	OPENSSL_free(ret);
	159	return NULL;
5270e702 RL	160	}
5270e702 RL	161	meth = ENGINE_get_DH(ret->engine);
d02b48c6 RE	162	ret->pad=0;
	163	ret->version=0;
	164	ret->p=NULL;
	165	ret->g=NULL;
	166	ret->length=0;
	167	ret->pub_key=NULL;
	168	ret->priv_key=NULL;
90644dd7 DSH	169	ret->q=NULL;
	170	ret->j=NULL;
	171	ret->seed = NULL;
	172	ret->seedlen = 0;
	173	ret->counter = NULL;
dfeab068	174	ret->method_mont_p=NULL;
13066cee	175	ret->references = 1;
5270e702	176	ret->flags=meth->flags;
d50f1bdf	177	CRYPTO_new_ex_data(dh_meth,ret,&ret->ex_data);
5270e702	178	if ((meth->init != NULL) && !meth->init(ret))
13066cee	179	{
d50f1bdf	180	CRYPTO_free_ex_data(dh_meth,ret,&ret->ex_data);
26a3a48d	181	OPENSSL_free(ret);
13066cee DSH	182	ret=NULL;
13066cee DSH	183	}
d02b48c6 RE	184	return(ret);
	185	}
	186
6b691a5c	187	void DH_free(DH *r)
d02b48c6	188	{
f971ccb2	189	const DH_METHOD *meth;
13066cee	190	int i;
ad65ce75	191	if(r == NULL) return;
13066cee DSH	192	i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DH);
	193	#ifdef REF_PRINT
	194	REF_PRINT("DH",r);
	195	#endif
	196	if (i > 0) return;
	197	#ifdef REF_CHECK
	198	if (i < 0)
	199	{
	200	fprintf(stderr,"DH_free, bad reference count\n");
	201	abort();
	202	}
	203	#endif
	204
5270e702 RL	205	meth = ENGINE_get_DH(r->engine);
	206	if(meth->finish) meth->finish(r);
	207	ENGINE_finish(r->engine);
ac8b4ee0	208
d50f1bdf GT	209	CRYPTO_free_ex_data(dh_meth, r, &r->ex_data);
d50f1bdf GT	210
d02b48c6 RE	211	if (r->p != NULL) BN_clear_free(r->p);
d02b48c6 RE	212	if (r->g != NULL) BN_clear_free(r->g);
90644dd7 DSH	213	if (r->q != NULL) BN_clear_free(r->q);
90644dd7 DSH	214	if (r->j != NULL) BN_clear_free(r->j);
26a3a48d	215	if (r->seed) OPENSSL_free(r->seed);
90644dd7	216	if (r->counter != NULL) BN_clear_free(r->counter);
d02b48c6 RE	217	if (r->pub_key != NULL) BN_clear_free(r->pub_key);
d02b48c6 RE	218	if (r->priv_key != NULL) BN_clear_free(r->priv_key);
26a3a48d	219	OPENSSL_free(r);
d02b48c6 RE	220	}
d02b48c6 RE	221
5cbc2e8b GT	222	int DH_up(DH *r)
	223	{
	224	int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DH);
	225	#ifdef REF_PRINT
	226	REF_PRINT("DH",r);
	227	#endif
	228	#ifdef REF_CHECK
	229	if (i < 2)
	230	{
	231	fprintf(stderr, "DH_up, bad reference count\n");
	232	abort();
	233	}
	234	#endif
	235	return ((i > 1) ? 1 : 0);
	236	}
	237
dd9d233e DSH	238	int DH_get_ex_new_index(long argl, void argp, CRYPTO_EX_new new_func,
dd9d233e DSH	239	CRYPTO_EX_dup dup_func, CRYPTO_EX_free free_func)
13066cee	240	{
b7727ee6 GT	241	if(CRYPTO_get_ex_new_index(dh_meth_num, &dh_meth, argl, argp,
	242	new_func, dup_func, free_func) < 0)
	243	return -1;
	244	return (dh_meth_num++);
13066cee DSH	245	}
13066cee DSH	246
dd9d233e	247	int DH_set_ex_data(DH d, int idx, void arg)
13066cee DSH	248	{
	249	return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
	250	}
	251
dd9d233e	252	void DH_get_ex_data(DH d, int idx)
13066cee DSH	253	{
	254	return(CRYPTO_get_ex_data(&d->ex_data,idx));
	255	}
	256
f971ccb2	257	int DH_size(const DH *dh)
d02b48c6 RE	258	{
	259	return(BN_num_bytes(dh->p));
	260	}