[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>

const char *DSA_version="DSA" OPENSSL_VERSION_PTEXT;

static 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_method(DSA_METHOD *meth)
{
	default_DSA_method = meth;
}

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

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

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;
}


DSA *DSA_new_method(DSA_METHOD *meth)
	{
	DSA *ret;

	ret=(DSA *)Malloc(sizeof(DSA));
	if (ret == NULL)
		{
		DSAerr(DSA_F_DSA_NEW,ERR_R_MALLOC_FAILURE);
		return(NULL);
		}
	if(meth) ret->meth = meth;
	else ret->meth = DSA_get_default_method();
	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=ret->meth->flags;
	if ((ret->meth->init != NULL) && !ret->meth->init(ret))
		{
		Free(ret);
		ret=NULL;
		}
	else
		CRYPTO_new_ex_data(dsa_meth,ret,&ret->ex_data);
	
	return(ret);
	}

void DSA_free(DSA *r)
	{
	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

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

	if(r->meth->finish) r->meth->finish(r);

	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);
	Free(r);
	}

int DSA_size(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(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>
d02b48c6	66
e778802f	67	const char *DSA_version="DSA" OPENSSL_VERSION_PTEXT;
d02b48c6	68
c0711f7f DSH	69	static DSA_METHOD *default_DSA_method;
c0711f7f DSH	70	static int dsa_meth_num = 0;
dd9d233e	71	static STACK_OF(CRYPTO_EX_DATA_FUNCS) *dsa_meth = NULL;
c0711f7f DSH	72
	73	void DSA_set_default_method(DSA_METHOD *meth)
	74	{
	75	default_DSA_method = meth;
	76	}
	77
	78	DSA_METHOD *DSA_get_default_method(void)
	79	{
	80	if(!default_DSA_method) default_DSA_method = DSA_OpenSSL();
	81	return default_DSA_method;
	82	}
	83
6b691a5c	84	DSA *DSA_new(void)
c0711f7f DSH	85	{
	86	return DSA_new_method(NULL);
	87	}
	88
	89	DSA_METHOD DSA_set_method(DSA dsa, DSA_METHOD *meth)
	90	{
	91	DSA_METHOD *mtmp;
	92	mtmp = dsa->meth;
	93	if (mtmp->finish) mtmp->finish(dsa);
	94	dsa->meth = meth;
	95	if (meth->init) meth->init(dsa);
	96	return mtmp;
	97	}
	98
	99
	100	DSA DSA_new_method(DSA_METHOD meth)
d02b48c6 RE	101	{
	102	DSA *ret;
	103
	104	ret=(DSA *)Malloc(sizeof(DSA));
	105	if (ret == NULL)
	106	{
	107	DSAerr(DSA_F_DSA_NEW,ERR_R_MALLOC_FAILURE);
	108	return(NULL);
	109	}
13066cee	110	if(meth) ret->meth = meth;
da414db4	111	else ret->meth = DSA_get_default_method();
d02b48c6 RE	112	ret->pad=0;
	113	ret->version=0;
	114	ret->write_params=1;
	115	ret->p=NULL;
	116	ret->q=NULL;
	117	ret->g=NULL;
	118
	119	ret->pub_key=NULL;
	120	ret->priv_key=NULL;
	121
	122	ret->kinv=NULL;
	123	ret->r=NULL;
dfeab068	124	ret->method_mont_p=NULL;
d02b48c6 RE	125
d02b48c6 RE	126	ret->references=1;
c0711f7f DSH	127	ret->flags=ret->meth->flags;
	128	if ((ret->meth->init != NULL) && !ret->meth->init(ret))
	129	{
	130	Free(ret);
	131	ret=NULL;
	132	}
	133	else
dd9d233e	134	CRYPTO_new_ex_data(dsa_meth,ret,&ret->ex_data);
c0711f7f	135
d02b48c6 RE	136	return(ret);
	137	}
	138
6b691a5c	139	void DSA_free(DSA *r)
d02b48c6 RE	140	{
	141	int i;
	142
	143	if (r == NULL) return;
	144
	145	i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA);
58964a49 RE	146	#ifdef REF_PRINT
	147	REF_PRINT("DSA",r);
	148	#endif
d02b48c6 RE	149	if (i > 0) return;
	150	#ifdef REF_CHECK
	151	if (i < 0)
	152	{
	153	fprintf(stderr,"DSA_free, bad reference count\n");
	154	abort();
	155	}
	156	#endif
	157
dd9d233e	158	CRYPTO_free_ex_data(dsa_meth, r, &r->ex_data);
c0711f7f DSH	159
	160	if(r->meth->finish) r->meth->finish(r);
	161
d02b48c6 RE	162	if (r->p != NULL) BN_clear_free(r->p);
	163	if (r->q != NULL) BN_clear_free(r->q);
	164	if (r->g != NULL) BN_clear_free(r->g);
	165	if (r->pub_key != NULL) BN_clear_free(r->pub_key);
	166	if (r->priv_key != NULL) BN_clear_free(r->priv_key);
	167	if (r->kinv != NULL) BN_clear_free(r->kinv);
	168	if (r->r != NULL) BN_clear_free(r->r);
	169	Free(r);
	170	}
	171
6b691a5c	172	int DSA_size(DSA *r)
d02b48c6 RE	173	{
	174	int ret,i;
	175	ASN1_INTEGER bs;
	176	unsigned char buf[4];
	177
	178	i=BN_num_bits(r->q);
	179	bs.length=(i+7)/8;
	180	bs.data=buf;
	181	bs.type=V_ASN1_INTEGER;
	182	/* If the top bit is set the asn1 encoding is 1 larger. */
	183	buf[0]=0xff;
	184
	185	i=i2d_ASN1_INTEGER(&bs,NULL);
	186	i+=i; /* r and s */
	187	ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE);
	188	return(ret);
	189	}
	190
dd9d233e DSH	191	int DSA_get_ex_new_index(long argl, void argp, CRYPTO_EX_new new_func,
dd9d233e DSH	192	CRYPTO_EX_dup dup_func, CRYPTO_EX_free free_func)
c0711f7f DSH	193	{
	194	dsa_meth_num++;
	195	return(CRYPTO_get_ex_new_index(dsa_meth_num-1,
	196	&dsa_meth,argl,argp,new_func,dup_func,free_func));
	197	}
	198
dd9d233e	199	int DSA_set_ex_data(DSA d, int idx, void arg)
c0711f7f DSH	200	{
	201	return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
	202	}
	203
dd9d233e	204	void DSA_get_ex_data(DSA d, int idx)
c0711f7f DSH	205	{
	206	return(CRYPTO_get_ex_data(&d->ex_data,idx));
	207	}
	208
48c843c3 BM	209	#ifndef NO_DH
	210	DH DSA_dup_DH(DSA r)
	211	{
	212	/* DSA has p, q, g, optional pub_key, optional priv_key.
	213	* DH has p, optional length, g, optional pub_key, optional priv_key.
	214	*/
	215
a12258fc	216	DH *ret = NULL;
48c843c3 BM	217
	218	if (r == NULL)
	219	goto err;
	220	ret = DH_new();
	221	if (ret == NULL)
	222	goto err;
	223	if (r->p != NULL)
	224	if ((ret->p = BN_dup(r->p)) == NULL)
	225	goto err;
	226	if (r->q != NULL)
	227	ret->length = BN_num_bits(r->q);
	228	if (r->g != NULL)
	229	if ((ret->g = BN_dup(r->g)) == NULL)
	230	goto err;
	231	if (r->pub_key != NULL)
	232	if ((ret->pub_key = BN_dup(r->pub_key)) == NULL)
	233	goto err;
	234	if (r->priv_key != NULL)
	235	if ((ret->priv_key = BN_dup(r->priv_key)) == NULL)
	236	goto err;
	237
	238	return ret;
	239
	240	err:
	241	if (ret != NULL)
	242	DH_free(ret);
	243	return NULL;
	244	}
	245	#endif