crypto/dsa/dsa_lib.c - third_party/openssl - Git at Google

 /* 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 *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(!default_DSA_method) default_DSA_method = DSA_OpenSSL();
 	if(meth) ret->meth = meth;
 	else ret->meth = default_DSA_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,(char *)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, (char *)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, char *argp, int (*new_func)(),
 	     int (*dup_func)(), void (*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, char *arg)
 	{
 	return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
 	}

 char *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
	/* 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 *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(!default_DSA_method) default_DSA_method = DSA_OpenSSL();
	if(meth) ret->meth = meth;
	else ret->meth = default_DSA_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,(char *)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, (char *)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, char argp, int (new_func)(),
	int (dup_func)(), void (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, char arg)
	{
	return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
	}

	char 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