sl@0: /* crypto/dsa/dsa_lib.c */
sl@0: /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
sl@0:  * All rights reserved.
sl@0:  *
sl@0:  * This package is an SSL implementation written
sl@0:  * by Eric Young (eay@cryptsoft.com).
sl@0:  * The implementation was written so as to conform with Netscapes SSL.
sl@0:  * 
sl@0:  * This library is free for commercial and non-commercial use as long as
sl@0:  * the following conditions are aheared to.  The following conditions
sl@0:  * apply to all code found in this distribution, be it the RC4, RSA,
sl@0:  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
sl@0:  * included with this distribution is covered by the same copyright terms
sl@0:  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
sl@0:  * 
sl@0:  * Copyright remains Eric Young's, and as such any Copyright notices in
sl@0:  * the code are not to be removed.
sl@0:  * If this package is used in a product, Eric Young should be given attribution
sl@0:  * as the author of the parts of the library used.
sl@0:  * This can be in the form of a textual message at program startup or
sl@0:  * in documentation (online or textual) provided with the package.
sl@0:  * 
sl@0:  * Redistribution and use in source and binary forms, with or without
sl@0:  * modification, are permitted provided that the following conditions
sl@0:  * are met:
sl@0:  * 1. Redistributions of source code must retain the copyright
sl@0:  *    notice, this list of conditions and the following disclaimer.
sl@0:  * 2. Redistributions in binary form must reproduce the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer in the
sl@0:  *    documentation and/or other materials provided with the distribution.
sl@0:  * 3. All advertising materials mentioning features or use of this software
sl@0:  *    must display the following acknowledgement:
sl@0:  *    "This product includes cryptographic software written by
sl@0:  *     Eric Young (eay@cryptsoft.com)"
sl@0:  *    The word 'cryptographic' can be left out if the rouines from the library
sl@0:  *    being used are not cryptographic related :-).
sl@0:  * 4. If you include any Windows specific code (or a derivative thereof) from 
sl@0:  *    the apps directory (application code) you must include an acknowledgement:
sl@0:  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
sl@0:  * 
sl@0:  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
sl@0:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
sl@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
sl@0:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
sl@0:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
sl@0:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
sl@0:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
sl@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
sl@0:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
sl@0:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
sl@0:  * SUCH DAMAGE.
sl@0:  * 
sl@0:  * The licence and distribution terms for any publically available version or
sl@0:  * derivative of this code cannot be changed.  i.e. this code cannot simply be
sl@0:  * copied and put under another distribution licence
sl@0:  * [including the GNU Public Licence.]
sl@0:  */
sl@0: 
sl@0: /* Original version from Steven Schoch <schoch@sheba.arc.nasa.gov> */
sl@0: /*
sl@0:  © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.
sl@0:  */
sl@0: 
sl@0: 
sl@0: #include <stdio.h>
sl@0: #include "cryptlib.h"
sl@0: #include <openssl/bn.h>
sl@0: #include <openssl/dsa.h>
sl@0: #include <openssl/asn1.h>
sl@0: #ifndef OPENSSL_NO_ENGINE
sl@0: #include <openssl/engine.h>
sl@0: #endif
sl@0: #ifndef OPENSSL_NO_DH
sl@0: #include <openssl/dh.h>
sl@0: #endif
sl@0: #if (defined(SYMBIAN) && (defined(__WINSCW__) || defined(__WINS__)))
sl@0: #include "libcrypto_wsd_macros.h"
sl@0: #include "libcrypto_wsd.h"
sl@0: #endif
sl@0: 
sl@0: const char DSA_version[]="DSA" OPENSSL_VERSION_PTEXT;
sl@0: 
sl@0: #ifndef EMULATOR
sl@0: static const DSA_METHOD *default_DSA_method = NULL;
sl@0: #else
sl@0: GET_STATIC_VAR_FROM_TLS(default_DSA_method,dsa_lib,const DSA_METHOD *)
sl@0: #define default_DSA_method (*GET_WSD_VAR_NAME(default_DSA_method,dsa_lib, s)())
sl@0: #endif
sl@0: 
sl@0: EXPORT_C void DSA_set_default_method(const DSA_METHOD *meth)
sl@0: 	{
sl@0: 	default_DSA_method = meth;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C const DSA_METHOD *DSA_get_default_method(void)
sl@0: 	{
sl@0: 	if(!default_DSA_method)
sl@0: 		default_DSA_method = DSA_OpenSSL();
sl@0: 	return default_DSA_method;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C DSA *DSA_new(void)
sl@0: 	{
sl@0: 	return DSA_new_method(NULL);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int DSA_set_method(DSA *dsa, const DSA_METHOD *meth)
sl@0: 	{
sl@0: 	/* NB: The caller is specifically setting a method, so it's not up to us
sl@0: 	 * to deal with which ENGINE it comes from. */
sl@0:         const DSA_METHOD *mtmp;
sl@0:         mtmp = dsa->meth;
sl@0:         if (mtmp->finish) mtmp->finish(dsa);
sl@0: #ifndef OPENSSL_NO_ENGINE
sl@0: 	if (dsa->engine)
sl@0: 		{
sl@0: 		ENGINE_finish(dsa->engine);
sl@0: 		dsa->engine = NULL;
sl@0: 		}
sl@0: #endif
sl@0:         dsa->meth = meth;
sl@0:         if (meth->init) meth->init(dsa);
sl@0:         return 1;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C DSA *DSA_new_method(ENGINE *engine)
sl@0: 	{
sl@0: 	DSA *ret;
sl@0: 
sl@0: 	ret=(DSA *)OPENSSL_malloc(sizeof(DSA));
sl@0: 	if (ret == NULL)
sl@0: 		{
sl@0: 		DSAerr(DSA_F_DSA_NEW_METHOD,ERR_R_MALLOC_FAILURE);
sl@0: 		return(NULL);
sl@0: 		}
sl@0: 	ret->meth = DSA_get_default_method();
sl@0: #ifndef OPENSSL_NO_ENGINE
sl@0: 	if (engine)
sl@0: 		{
sl@0: 		if (!ENGINE_init(engine))
sl@0: 			{
sl@0: 			DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB);
sl@0: 			OPENSSL_free(ret);
sl@0: 			return NULL;
sl@0: 			}
sl@0: 		ret->engine = engine;
sl@0: 		}
sl@0: 	else
sl@0: 		ret->engine = ENGINE_get_default_DSA();
sl@0: 	if(ret->engine)
sl@0: 		{
sl@0: 		ret->meth = ENGINE_get_DSA(ret->engine);
sl@0: 		if(!ret->meth)
sl@0: 			{
sl@0: 			DSAerr(DSA_F_DSA_NEW_METHOD,
sl@0: 				ERR_R_ENGINE_LIB);
sl@0: 			ENGINE_finish(ret->engine);
sl@0: 			OPENSSL_free(ret);
sl@0: 			return NULL;
sl@0: 			}
sl@0: 		}
sl@0: #endif
sl@0: 
sl@0: 	ret->pad=0;
sl@0: 	ret->version=0;
sl@0: 	ret->write_params=1;
sl@0: 	ret->p=NULL;
sl@0: 	ret->q=NULL;
sl@0: 	ret->g=NULL;
sl@0: 
sl@0: 	ret->pub_key=NULL;
sl@0: 	ret->priv_key=NULL;
sl@0: 
sl@0: 	ret->kinv=NULL;
sl@0: 	ret->r=NULL;
sl@0: 	ret->method_mont_p=NULL;
sl@0: 
sl@0: 	ret->references=1;
sl@0: 	ret->flags=ret->meth->flags;
sl@0: 	CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
sl@0: 	if ((ret->meth->init != NULL) && !ret->meth->init(ret))
sl@0: 		{
sl@0: #ifndef OPENSSL_NO_ENGINE
sl@0: 		if (ret->engine)
sl@0: 			ENGINE_finish(ret->engine);
sl@0: #endif
sl@0: 		CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
sl@0: 		OPENSSL_free(ret);
sl@0: 		ret=NULL;
sl@0: 		}
sl@0: 	
sl@0: 	return(ret);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void DSA_free(DSA *r)
sl@0: 	{
sl@0: 	int i;
sl@0: 
sl@0: 	if (r == NULL) return;
sl@0: 
sl@0: 	i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA);
sl@0: #ifdef REF_PRINT
sl@0: 	REF_PRINT("DSA",r);
sl@0: #endif
sl@0: 	if (i > 0) return;
sl@0: #ifdef REF_CHECK
sl@0: 	if (i < 0)
sl@0: 		{
sl@0: 		fprintf(stderr,"DSA_free, bad reference count\n");
sl@0: 		abort();
sl@0: 		}
sl@0: #endif
sl@0: 
sl@0: 	if(r->meth->finish)
sl@0: 		r->meth->finish(r);
sl@0: #ifndef OPENSSL_NO_ENGINE
sl@0: 	if(r->engine)
sl@0: 		ENGINE_finish(r->engine);
sl@0: #endif
sl@0: 
sl@0: 	CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data);
sl@0: 
sl@0: 	if (r->p != NULL) BN_clear_free(r->p);
sl@0: 	if (r->q != NULL) BN_clear_free(r->q);
sl@0: 	if (r->g != NULL) BN_clear_free(r->g);
sl@0: 	if (r->pub_key != NULL) BN_clear_free(r->pub_key);
sl@0: 	if (r->priv_key != NULL) BN_clear_free(r->priv_key);
sl@0: 	if (r->kinv != NULL) BN_clear_free(r->kinv);
sl@0: 	if (r->r != NULL) BN_clear_free(r->r);
sl@0: 	OPENSSL_free(r);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int DSA_up_ref(DSA *r)
sl@0: 	{
sl@0: 	int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA);
sl@0: #ifdef REF_PRINT
sl@0: 	REF_PRINT("DSA",r);
sl@0: #endif
sl@0: #ifdef REF_CHECK
sl@0: 	if (i < 2)
sl@0: 		{
sl@0: 		fprintf(stderr, "DSA_up_ref, bad reference count\n");
sl@0: 		abort();
sl@0: 		}
sl@0: #endif
sl@0: 	return ((i > 1) ? 1 : 0);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int DSA_size(const DSA *r)
sl@0: 	{
sl@0: 	int ret,i;
sl@0: 	ASN1_INTEGER bs;
sl@0: 	unsigned char buf[4];	/* 4 bytes looks really small.
sl@0: 				   However, i2d_ASN1_INTEGER() will not look
sl@0: 				   beyond the first byte, as long as the second
sl@0: 				   parameter is NULL. */
sl@0: 
sl@0: 	i=BN_num_bits(r->q);
sl@0: 	bs.length=(i+7)/8;
sl@0: 	bs.data=buf;
sl@0: 	bs.type=V_ASN1_INTEGER;
sl@0: 	/* If the top bit is set the asn1 encoding is 1 larger. */
sl@0: 	buf[0]=0xff;	
sl@0: 
sl@0: 	i=i2d_ASN1_INTEGER(&bs,NULL);
sl@0: 	i+=i; /* r and s */
sl@0: 	ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE);
sl@0: 	return(ret);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
sl@0: 	     CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
sl@0:         {
sl@0: 	return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp,
sl@0: 				new_func, dup_func, free_func);
sl@0:         }
sl@0: 
sl@0: EXPORT_C int DSA_set_ex_data(DSA *d, int idx, void *arg)
sl@0: 	{
sl@0: 	return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void *DSA_get_ex_data(DSA *d, int idx)
sl@0: 	{
sl@0: 	return(CRYPTO_get_ex_data(&d->ex_data,idx));
sl@0: 	}
sl@0: 
sl@0: #ifndef OPENSSL_NO_DH
sl@0: EXPORT_C DH *DSA_dup_DH(const DSA *r)
sl@0: 	{
sl@0: 	/* DSA has p, q, g, optional pub_key, optional priv_key.
sl@0: 	 * DH has p, optional length, g, optional pub_key, optional priv_key.
sl@0: 	 */ 
sl@0: 
sl@0: 	DH *ret = NULL;
sl@0: 
sl@0: 	if (r == NULL)
sl@0: 		goto err;
sl@0: 	ret = DH_new();
sl@0: 	if (ret == NULL)
sl@0: 		goto err;
sl@0: 	if (r->p != NULL) 
sl@0: 		if ((ret->p = BN_dup(r->p)) == NULL)
sl@0: 			goto err;
sl@0: 	if (r->q != NULL)
sl@0: 		ret->length = BN_num_bits(r->q);
sl@0: 	if (r->g != NULL)
sl@0: 		if ((ret->g = BN_dup(r->g)) == NULL)
sl@0: 			goto err;
sl@0: 	if (r->pub_key != NULL)
sl@0: 		if ((ret->pub_key = BN_dup(r->pub_key)) == NULL)
sl@0: 			goto err;
sl@0: 	if (r->priv_key != NULL)
sl@0: 		if ((ret->priv_key = BN_dup(r->priv_key)) == NULL)
sl@0: 			goto err;
sl@0: 
sl@0: 	return ret;
sl@0: 
sl@0:  err:
sl@0: 	if (ret != NULL)
sl@0: 		DH_free(ret);
sl@0: 	return NULL;
sl@0: 	}
sl@0: #endif