[thirdparty/openssl.git] / crypto / dsa / dsa_lib.c

/* crypto/dsa/dsa_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.]
 */

/* Original version from Steven Schoch <schoch@sheba.arc.nasa.gov> */

#include <stdio.h>
#include "cryptlib.h"
#include <openssl/bn.h>
#include <openssl/dsa.h>
#include <openssl/asn1.h>
#include <openssl/engine.h>

const char *DSA_version="DSA" OPENSSL_VERSION_PTEXT;

static const DSA_METHOD *default_DSA_method;
static int dsa_meth_num = 0;
static STACK_OF(CRYPTO_EX_DATA_FUNCS) *dsa_meth = NULL;

void DSA_set_default_openssl_method(const DSA_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_DSA_method != meth)
		{
		default_DSA_method = meth;
		e = ENGINE_by_id("openssl");
		if(e)
			{
			ENGINE_set_DSA(e, meth);
			ENGINE_free(e);
			}
		}
}

const DSA_METHOD *DSA_get_default_openssl_method(void)
{
	if(!default_DSA_method) default_DSA_method = DSA_OpenSSL();
	return default_DSA_method;
}

DSA *DSA_new(void)
{
	return DSA_new_method(NULL);
}

#if 0
DSA_METHOD *DSA_set_method(DSA *dsa, DSA_METHOD *meth)
{
        DSA_METHOD *mtmp;
        mtmp = dsa->meth;
        if (mtmp->finish) mtmp->finish(dsa);
        dsa->meth = meth;
        if (meth->init) meth->init(dsa);
        return mtmp;
}
#else
int DSA_set_method(DSA *dsa, ENGINE *engine)
	{
	ENGINE *mtmp;
	const DSA_METHOD *meth;
	mtmp = dsa->engine;
	meth = ENGINE_get_DSA(mtmp);
	if (!ENGINE_init(engine))
		return 0;
	if (meth->finish) meth->finish(dsa);
	dsa->engine = engine;
	meth = ENGINE_get_DSA(engine);
	if (meth->init) meth->init(dsa);
	/* SHOULD ERROR CHECK THIS!!! */
	ENGINE_finish(mtmp);
	return 1;
	}
#endif


#if 0
DSA *DSA_new_method(DSA_METHOD *meth)
#else
DSA *DSA_new_method(ENGINE *engine)
#endif
	{
	const DSA_METHOD *meth;
	DSA *ret;

	ret=(DSA *)OPENSSL_malloc(sizeof(DSA));
	if (ret == NULL)
		{
		DSAerr(DSA_F_DSA_NEW,ERR_R_MALLOC_FAILURE);
		return(NULL);
		}
	if(engine)
		ret->engine = engine;
	else
		{
		if((ret->engine=ENGINE_get_default_DSA()) == NULL)
			{
			OPENSSL_free(ret);
			return NULL;
			}
		}
	meth = ENGINE_get_DSA(ret->engine);
	ret->pad=0;
	ret->version=0;
	ret->write_params=1;
	ret->p=NULL;
	ret->q=NULL;
	ret->g=NULL;

	ret->pub_key=NULL;
	ret->priv_key=NULL;

	ret->kinv=NULL;
	ret->r=NULL;
	ret->method_mont_p=NULL;

	ret->references=1;
	ret->flags=meth->flags;
	CRYPTO_new_ex_data(dsa_meth,ret,&ret->ex_data);
	if ((meth->init != NULL) && !meth->init(ret))
		{
		CRYPTO_free_ex_data(dsa_meth,ret,&ret->ex_data);
		OPENSSL_free(ret);
		ret=NULL;
		}
	
	return(ret);
	}

void DSA_free(DSA *r)
	{
	const DSA_METHOD *meth;
	int i;

	if (r == NULL) return;

	i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA);
#ifdef REF_PRINT
	REF_PRINT("DSA",r);
#endif
	if (i > 0) return;
#ifdef REF_CHECK
	if (i < 0)
		{
		fprintf(stderr,"DSA_free, bad reference count\n");
		abort();
		}
#endif

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

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

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

int DSA_size(const DSA *r)
	{
	int ret,i;
	ASN1_INTEGER bs;
	unsigned char buf[4];

	i=BN_num_bits(r->q);
	bs.length=(i+7)/8;
	bs.data=buf;
	bs.type=V_ASN1_INTEGER;
	/* If the top bit is set the asn1 encoding is 1 larger. */
	buf[0]=0xff;	

	i=i2d_ASN1_INTEGER(&bs,NULL);
	i+=i; /* r and s */
	ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE);
	return(ret);
	}

int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
	     CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
        {
	dsa_meth_num++;
	return(CRYPTO_get_ex_new_index(dsa_meth_num-1,
		&dsa_meth,argl,argp,new_func,dup_func,free_func));
        }

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

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

#ifndef NO_DH
DH *DSA_dup_DH(const DSA *r)
	{
	/* DSA has p, q, g, optional pub_key, optional priv_key.
	 * DH has p, optional length, g, optional pub_key, optional priv_key.
	 */ 

	DH *ret = NULL;

	if (r == NULL)
		goto err;
	ret = DH_new();
	if (ret == NULL)
		goto err;
	if (r->p != NULL) 
		if ((ret->p = BN_dup(r->p)) == NULL)
			goto err;
	if (r->q != NULL)
		ret->length = BN_num_bits(r->q);
	if (r->g != NULL)
		if ((ret->g = BN_dup(r->g)) == NULL)
			goto err;
	if (r->pub_key != NULL)
		if ((ret->pub_key = BN_dup(r->pub_key)) == NULL)
			goto err;
	if (r->priv_key != NULL)
		if ((ret->priv_key = BN_dup(r->priv_key)) == NULL)
			goto err;

	return ret;

 err:
	if (ret != NULL)
		DH_free(ret);
	return NULL;
	}
#endif
Commit	Line	Data
d02b48c6	1	/* crypto/dsa/dsa_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
651d0aff	59	/* Original version from Steven Schoch <schoch@sheba.arc.nasa.gov> */
d02b48c6 RE	60
	61	#include <stdio.h>
	62	#include "cryptlib.h"
ec577822 BM	63	#include <openssl/bn.h>
	64	#include <openssl/dsa.h>
	65	#include <openssl/asn1.h>
5270e702	66	#include <openssl/engine.h>
d02b48c6	67
e778802f	68	const char *DSA_version="DSA" OPENSSL_VERSION_PTEXT;
d02b48c6	69
a4aba800	70	static const DSA_METHOD *default_DSA_method;
c0711f7f	71	static int dsa_meth_num = 0;
dd9d233e	72	static STACK_OF(CRYPTO_EX_DATA_FUNCS) *dsa_meth = NULL;
c0711f7f	73
a4aba800	74	void DSA_set_default_openssl_method(const DSA_METHOD *meth)
c0711f7f	75	{
5270e702 RL	76	ENGINE *e;
	77	/* We'll need to notify the "openssl" ENGINE of this
	78	* change too. We won't bother locking things down at
	79	* our end as there was never any locking in these
	80	* functions! */
	81	if(default_DSA_method != meth)
	82	{
	83	default_DSA_method = meth;
	84	e = ENGINE_by_id("openssl");
	85	if(e)
	86	{
	87	ENGINE_set_DSA(e, meth);
	88	ENGINE_free(e);
	89	}
	90	}
c0711f7f DSH	91	}
c0711f7f DSH	92
a4aba800	93	const DSA_METHOD *DSA_get_default_openssl_method(void)
c0711f7f DSH	94	{
	95	if(!default_DSA_method) default_DSA_method = DSA_OpenSSL();
	96	return default_DSA_method;
	97	}
	98
6b691a5c	99	DSA *DSA_new(void)
c0711f7f DSH	100	{
	101	return DSA_new_method(NULL);
	102	}
	103
5270e702	104	#if 0
c0711f7f DSH	105	DSA_METHOD DSA_set_method(DSA dsa, DSA_METHOD *meth)
	106	{
	107	DSA_METHOD *mtmp;
	108	mtmp = dsa->meth;
	109	if (mtmp->finish) mtmp->finish(dsa);
	110	dsa->meth = meth;
	111	if (meth->init) meth->init(dsa);
	112	return mtmp;
	113	}
5270e702 RL	114	#else
	115	int DSA_set_method(DSA dsa, ENGINE engine)
	116	{
	117	ENGINE *mtmp;
a4aba800	118	const DSA_METHOD *meth;
5270e702 RL	119	mtmp = dsa->engine;
	120	meth = ENGINE_get_DSA(mtmp);
	121	if (!ENGINE_init(engine))
	122	return 0;
	123	if (meth->finish) meth->finish(dsa);
	124	dsa->engine = engine;
	125	meth = ENGINE_get_DSA(engine);
	126	if (meth->init) meth->init(dsa);
	127	/* SHOULD ERROR CHECK THIS!!! */
	128	ENGINE_finish(mtmp);
	129	return 1;
	130	}
	131	#endif
c0711f7f DSH	132
c0711f7f DSH	133
5270e702	134	#if 0
c0711f7f	135	DSA DSA_new_method(DSA_METHOD meth)
5270e702 RL	136	#else
	137	DSA DSA_new_method(ENGINE engine)
	138	#endif
d02b48c6	139	{
a4aba800	140	const DSA_METHOD *meth;
d02b48c6 RE	141	DSA *ret;
d02b48c6 RE	142
26a3a48d	143	ret=(DSA *)OPENSSL_malloc(sizeof(DSA));
d02b48c6 RE	144	if (ret == NULL)
	145	{
	146	DSAerr(DSA_F_DSA_NEW,ERR_R_MALLOC_FAILURE);
	147	return(NULL);
	148	}
5270e702 RL	149	if(engine)
	150	ret->engine = engine;
	151	else
	152	{
	153	if((ret->engine=ENGINE_get_default_DSA()) == NULL)
	154	{
	155	OPENSSL_free(ret);
	156	return NULL;
	157	}
	158	}
	159	meth = ENGINE_get_DSA(ret->engine);
d02b48c6 RE	160	ret->pad=0;
	161	ret->version=0;
	162	ret->write_params=1;
	163	ret->p=NULL;
	164	ret->q=NULL;
	165	ret->g=NULL;
	166
	167	ret->pub_key=NULL;
	168	ret->priv_key=NULL;
	169
	170	ret->kinv=NULL;
	171	ret->r=NULL;
dfeab068	172	ret->method_mont_p=NULL;
d02b48c6 RE	173
d02b48c6 RE	174	ret->references=1;
5270e702	175	ret->flags=meth->flags;
d50f1bdf	176	CRYPTO_new_ex_data(dsa_meth,ret,&ret->ex_data);
5270e702	177	if ((meth->init != NULL) && !meth->init(ret))
c0711f7f	178	{
d50f1bdf	179	CRYPTO_free_ex_data(dsa_meth,ret,&ret->ex_data);
26a3a48d	180	OPENSSL_free(ret);
c0711f7f DSH	181	ret=NULL;
c0711f7f DSH	182	}
c0711f7f	183
d02b48c6 RE	184	return(ret);
	185	}
	186
6b691a5c	187	void DSA_free(DSA *r)
d02b48c6	188	{
a4aba800	189	const DSA_METHOD *meth;
d02b48c6 RE	190	int i;
	191
	192	if (r == NULL) return;
	193
	194	i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA);
58964a49 RE	195	#ifdef REF_PRINT
	196	REF_PRINT("DSA",r);
	197	#endif
d02b48c6 RE	198	if (i > 0) return;
	199	#ifdef REF_CHECK
	200	if (i < 0)
	201	{
	202	fprintf(stderr,"DSA_free, bad reference count\n");
	203	abort();
	204	}
	205	#endif
	206
5270e702 RL	207	meth = ENGINE_get_DSA(r->engine);
	208	if(meth->finish) meth->finish(r);
	209	ENGINE_finish(r->engine);
c0711f7f	210
d50f1bdf GT	211	CRYPTO_free_ex_data(dsa_meth, r, &r->ex_data);
d50f1bdf GT	212
d02b48c6 RE	213	if (r->p != NULL) BN_clear_free(r->p);
	214	if (r->q != NULL) BN_clear_free(r->q);
	215	if (r->g != NULL) BN_clear_free(r->g);
	216	if (r->pub_key != NULL) BN_clear_free(r->pub_key);
	217	if (r->priv_key != NULL) BN_clear_free(r->priv_key);
	218	if (r->kinv != NULL) BN_clear_free(r->kinv);
	219	if (r->r != NULL) BN_clear_free(r->r);
26a3a48d	220	OPENSSL_free(r);
d02b48c6 RE	221	}
d02b48c6 RE	222
a4aba800	223	int DSA_size(const DSA *r)
d02b48c6 RE	224	{
	225	int ret,i;
	226	ASN1_INTEGER bs;
	227	unsigned char buf[4];
	228
	229	i=BN_num_bits(r->q);
	230	bs.length=(i+7)/8;
	231	bs.data=buf;
	232	bs.type=V_ASN1_INTEGER;
	233	/* If the top bit is set the asn1 encoding is 1 larger. */
	234	buf[0]=0xff;
	235
	236	i=i2d_ASN1_INTEGER(&bs,NULL);
	237	i+=i; /* r and s */
	238	ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE);
	239	return(ret);
	240	}
	241
dd9d233e DSH	242	int DSA_get_ex_new_index(long argl, void argp, CRYPTO_EX_new new_func,
dd9d233e DSH	243	CRYPTO_EX_dup dup_func, CRYPTO_EX_free free_func)
c0711f7f DSH	244	{
	245	dsa_meth_num++;
	246	return(CRYPTO_get_ex_new_index(dsa_meth_num-1,
	247	&dsa_meth,argl,argp,new_func,dup_func,free_func));
	248	}
	249
dd9d233e	250	int DSA_set_ex_data(DSA d, int idx, void arg)
c0711f7f DSH	251	{
	252	return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
	253	}
	254
dd9d233e	255	void DSA_get_ex_data(DSA d, int idx)
c0711f7f DSH	256	{
	257	return(CRYPTO_get_ex_data(&d->ex_data,idx));
	258	}
	259
48c843c3	260	#ifndef NO_DH
a4aba800	261	DH DSA_dup_DH(const DSA r)
48c843c3 BM	262	{
	263	/* DSA has p, q, g, optional pub_key, optional priv_key.
	264	* DH has p, optional length, g, optional pub_key, optional priv_key.
	265	*/
	266
a12258fc	267	DH *ret = NULL;
48c843c3 BM	268
	269	if (r == NULL)
	270	goto err;
	271	ret = DH_new();
	272	if (ret == NULL)
	273	goto err;
	274	if (r->p != NULL)
	275	if ((ret->p = BN_dup(r->p)) == NULL)
	276	goto err;
	277	if (r->q != NULL)
	278	ret->length = BN_num_bits(r->q);
	279	if (r->g != NULL)
	280	if ((ret->g = BN_dup(r->g)) == NULL)
	281	goto err;
	282	if (r->pub_key != NULL)
	283	if ((ret->pub_key = BN_dup(r->pub_key)) == NULL)
	284	goto err;
	285	if (r->priv_key != NULL)
	286	if ((ret->priv_key = BN_dup(r->priv_key)) == NULL)
	287	goto err;
	288
	289	return ret;
	290
	291	err:
	292	if (ret != NULL)
	293	DH_free(ret);
	294	return NULL;
	295	}
	296	#endif