dsa_lib.c revision 55714
155714Skris/* crypto/dsa/dsa_lib.c */ 255714Skris/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 355714Skris * All rights reserved. 455714Skris * 555714Skris * This package is an SSL implementation written 655714Skris * by Eric Young (eay@cryptsoft.com). 755714Skris * The implementation was written so as to conform with Netscapes SSL. 855714Skris * 955714Skris * This library is free for commercial and non-commercial use as long as 1055714Skris * the following conditions are aheared to. The following conditions 1155714Skris * apply to all code found in this distribution, be it the RC4, RSA, 1255714Skris * lhash, DES, etc., code; not just the SSL code. The SSL documentation 1355714Skris * included with this distribution is covered by the same copyright terms 1455714Skris * except that the holder is Tim Hudson (tjh@cryptsoft.com). 1555714Skris * 1655714Skris * Copyright remains Eric Young's, and as such any Copyright notices in 1755714Skris * the code are not to be removed. 1855714Skris * If this package is used in a product, Eric Young should be given attribution 1955714Skris * as the author of the parts of the library used. 2055714Skris * This can be in the form of a textual message at program startup or 2155714Skris * in documentation (online or textual) provided with the package. 2255714Skris * 2355714Skris * Redistribution and use in source and binary forms, with or without 2455714Skris * modification, are permitted provided that the following conditions 2555714Skris * are met: 2655714Skris * 1. Redistributions of source code must retain the copyright 2755714Skris * notice, this list of conditions and the following disclaimer. 2855714Skris * 2. Redistributions in binary form must reproduce the above copyright 2955714Skris * notice, this list of conditions and the following disclaimer in the 3055714Skris * documentation and/or other materials provided with the distribution. 3155714Skris * 3. All advertising materials mentioning features or use of this software 3255714Skris * must display the following acknowledgement: 3355714Skris * "This product includes cryptographic software written by 3455714Skris * Eric Young (eay@cryptsoft.com)" 3555714Skris * The word 'cryptographic' can be left out if the rouines from the library 3655714Skris * being used are not cryptographic related :-). 3755714Skris * 4. If you include any Windows specific code (or a derivative thereof) from 3855714Skris * the apps directory (application code) you must include an acknowledgement: 3955714Skris * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 4055714Skris * 4155714Skris * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 4255714Skris * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 4355714Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 4455714Skris * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 4555714Skris * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 4655714Skris * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 4755714Skris * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4855714Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 4955714Skris * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 5055714Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 5155714Skris * SUCH DAMAGE. 5255714Skris * 5355714Skris * The licence and distribution terms for any publically available version or 5455714Skris * derivative of this code cannot be changed. i.e. this code cannot simply be 5555714Skris * copied and put under another distribution licence 5655714Skris * [including the GNU Public Licence.] 5755714Skris */ 5855714Skris 5955714Skris/* Original version from Steven Schoch <schoch@sheba.arc.nasa.gov> */ 6055714Skris 6155714Skris#include <stdio.h> 6255714Skris#include "cryptlib.h" 6355714Skris#include <openssl/bn.h> 6455714Skris#include <openssl/dsa.h> 6555714Skris#include <openssl/asn1.h> 6655714Skris 6755714Skrisconst char *DSA_version="DSA" OPENSSL_VERSION_PTEXT; 6855714Skris 6955714SkrisDSA *DSA_new(void) 7055714Skris { 7155714Skris DSA *ret; 7255714Skris 7355714Skris ret=(DSA *)Malloc(sizeof(DSA)); 7455714Skris if (ret == NULL) 7555714Skris { 7655714Skris DSAerr(DSA_F_DSA_NEW,ERR_R_MALLOC_FAILURE); 7755714Skris return(NULL); 7855714Skris } 7955714Skris ret->pad=0; 8055714Skris ret->version=0; 8155714Skris ret->write_params=1; 8255714Skris ret->p=NULL; 8355714Skris ret->q=NULL; 8455714Skris ret->g=NULL; 8555714Skris ret->flags=DSA_FLAG_CACHE_MONT_P; 8655714Skris 8755714Skris ret->pub_key=NULL; 8855714Skris ret->priv_key=NULL; 8955714Skris 9055714Skris ret->kinv=NULL; 9155714Skris ret->r=NULL; 9255714Skris ret->method_mont_p=NULL; 9355714Skris 9455714Skris ret->references=1; 9555714Skris return(ret); 9655714Skris } 9755714Skris 9855714Skrisvoid DSA_free(DSA *r) 9955714Skris { 10055714Skris int i; 10155714Skris 10255714Skris if (r == NULL) return; 10355714Skris 10455714Skris i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA); 10555714Skris#ifdef REF_PRINT 10655714Skris REF_PRINT("DSA",r); 10755714Skris#endif 10855714Skris if (i > 0) return; 10955714Skris#ifdef REF_CHECK 11055714Skris if (i < 0) 11155714Skris { 11255714Skris fprintf(stderr,"DSA_free, bad reference count\n"); 11355714Skris abort(); 11455714Skris } 11555714Skris#endif 11655714Skris 11755714Skris if (r->p != NULL) BN_clear_free(r->p); 11855714Skris if (r->q != NULL) BN_clear_free(r->q); 11955714Skris if (r->g != NULL) BN_clear_free(r->g); 12055714Skris if (r->pub_key != NULL) BN_clear_free(r->pub_key); 12155714Skris if (r->priv_key != NULL) BN_clear_free(r->priv_key); 12255714Skris if (r->kinv != NULL) BN_clear_free(r->kinv); 12355714Skris if (r->r != NULL) BN_clear_free(r->r); 12455714Skris if (r->method_mont_p != NULL) 12555714Skris BN_MONT_CTX_free((BN_MONT_CTX *)r->method_mont_p); 12655714Skris Free(r); 12755714Skris } 12855714Skris 12955714Skrisint DSA_size(DSA *r) 13055714Skris { 13155714Skris int ret,i; 13255714Skris ASN1_INTEGER bs; 13355714Skris unsigned char buf[4]; 13455714Skris 13555714Skris i=BN_num_bits(r->q); 13655714Skris bs.length=(i+7)/8; 13755714Skris bs.data=buf; 13855714Skris bs.type=V_ASN1_INTEGER; 13955714Skris /* If the top bit is set the asn1 encoding is 1 larger. */ 14055714Skris buf[0]=0xff; 14155714Skris 14255714Skris i=i2d_ASN1_INTEGER(&bs,NULL); 14355714Skris i+=i; /* r and s */ 14455714Skris ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE); 14555714Skris return(ret); 14655714Skris } 14755714Skris 14855714Skris#ifndef NO_DH 14955714SkrisDH *DSA_dup_DH(DSA *r) 15055714Skris { 15155714Skris /* DSA has p, q, g, optional pub_key, optional priv_key. 15255714Skris * DH has p, optional length, g, optional pub_key, optional priv_key. 15355714Skris */ 15455714Skris 15555714Skris DH *ret = NULL; 15655714Skris 15755714Skris if (r == NULL) 15855714Skris goto err; 15955714Skris ret = DH_new(); 16055714Skris if (ret == NULL) 16155714Skris goto err; 16255714Skris if (r->p != NULL) 16355714Skris if ((ret->p = BN_dup(r->p)) == NULL) 16455714Skris goto err; 16555714Skris if (r->q != NULL) 16655714Skris ret->length = BN_num_bits(r->q); 16755714Skris if (r->g != NULL) 16855714Skris if ((ret->g = BN_dup(r->g)) == NULL) 16955714Skris goto err; 17055714Skris if (r->pub_key != NULL) 17155714Skris if ((ret->pub_key = BN_dup(r->pub_key)) == NULL) 17255714Skris goto err; 17355714Skris if (r->priv_key != NULL) 17455714Skris if ((ret->priv_key = BN_dup(r->priv_key)) == NULL) 17555714Skris goto err; 17655714Skris 17755714Skris return ret; 17855714Skris 17955714Skris err: 18055714Skris if (ret != NULL) 18155714Skris DH_free(ret); 18255714Skris return NULL; 18355714Skris } 18455714Skris#endif 185