openssl/crypto/dsa/dsa_lib.c
2000-01-23 23:41:49 +00:00

247 lines
6.9 KiB
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(!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,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