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> 66111147Snectar#ifndef OPENSSL_NO_ENGINE 67109998Smarkm#include <openssl/engine.h> 68111147Snectar#endif 69160814Ssimon#ifndef OPENSSL_NO_DH 70160814Ssimon#include <openssl/dh.h> 71160814Ssimon#endif 7255714Skris 73238405Sjkim#ifdef OPENSSL_FIPS 74238405Sjkim#include <openssl/fips.h> 75238405Sjkim#endif 76238405Sjkim 77167612Ssimonconst char DSA_version[]="DSA" OPENSSL_VERSION_PTEXT; 7855714Skris 79109998Smarkmstatic const DSA_METHOD *default_DSA_method = NULL; 8059191Skris 81109998Smarkmvoid DSA_set_default_method(const DSA_METHOD *meth) 82109998Smarkm { 8359191Skris default_DSA_method = meth; 84109998Smarkm } 8559191Skris 86109998Smarkmconst DSA_METHOD *DSA_get_default_method(void) 87109998Smarkm { 88109998Smarkm if(!default_DSA_method) 89238405Sjkim { 90238405Sjkim#ifdef OPENSSL_FIPS 91238405Sjkim if (FIPS_mode()) 92238405Sjkim return FIPS_dsa_openssl(); 93238405Sjkim else 94238405Sjkim return DSA_OpenSSL(); 95238405Sjkim#else 96109998Smarkm default_DSA_method = DSA_OpenSSL(); 97238405Sjkim#endif 98238405Sjkim } 9959191Skris return default_DSA_method; 100109998Smarkm } 10159191Skris 10255714SkrisDSA *DSA_new(void) 103109998Smarkm { 10459191Skris return DSA_new_method(NULL); 105109998Smarkm } 10659191Skris 107109998Smarkmint DSA_set_method(DSA *dsa, const DSA_METHOD *meth) 108109998Smarkm { 109109998Smarkm /* NB: The caller is specifically setting a method, so it's not up to us 110109998Smarkm * to deal with which ENGINE it comes from. */ 111109998Smarkm const DSA_METHOD *mtmp; 11259191Skris mtmp = dsa->meth; 11359191Skris if (mtmp->finish) mtmp->finish(dsa); 114111147Snectar#ifndef OPENSSL_NO_ENGINE 115109998Smarkm if (dsa->engine) 116109998Smarkm { 117109998Smarkm ENGINE_finish(dsa->engine); 118109998Smarkm dsa->engine = NULL; 119109998Smarkm } 120111147Snectar#endif 12159191Skris dsa->meth = meth; 12259191Skris if (meth->init) meth->init(dsa); 123109998Smarkm return 1; 124109998Smarkm } 12559191Skris 126109998SmarkmDSA *DSA_new_method(ENGINE *engine) 12755714Skris { 12855714Skris DSA *ret; 12955714Skris 13068651Skris ret=(DSA *)OPENSSL_malloc(sizeof(DSA)); 13155714Skris if (ret == NULL) 13255714Skris { 133109998Smarkm DSAerr(DSA_F_DSA_NEW_METHOD,ERR_R_MALLOC_FAILURE); 13455714Skris return(NULL); 13555714Skris } 136109998Smarkm ret->meth = DSA_get_default_method(); 137111147Snectar#ifndef OPENSSL_NO_ENGINE 138109998Smarkm if (engine) 139109998Smarkm { 140109998Smarkm if (!ENGINE_init(engine)) 141109998Smarkm { 142109998Smarkm DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB); 143109998Smarkm OPENSSL_free(ret); 144109998Smarkm return NULL; 145109998Smarkm } 146109998Smarkm ret->engine = engine; 147109998Smarkm } 148109998Smarkm else 149109998Smarkm ret->engine = ENGINE_get_default_DSA(); 150109998Smarkm if(ret->engine) 151109998Smarkm { 152109998Smarkm ret->meth = ENGINE_get_DSA(ret->engine); 153109998Smarkm if(!ret->meth) 154109998Smarkm { 155109998Smarkm DSAerr(DSA_F_DSA_NEW_METHOD, 156109998Smarkm ERR_R_ENGINE_LIB); 157109998Smarkm ENGINE_finish(ret->engine); 158109998Smarkm OPENSSL_free(ret); 159109998Smarkm return NULL; 160109998Smarkm } 161109998Smarkm } 162111147Snectar#endif 163109998Smarkm 16455714Skris ret->pad=0; 16555714Skris ret->version=0; 16655714Skris ret->write_params=1; 16755714Skris ret->p=NULL; 16855714Skris ret->q=NULL; 16955714Skris ret->g=NULL; 17055714Skris 17155714Skris ret->pub_key=NULL; 17255714Skris ret->priv_key=NULL; 17355714Skris 17455714Skris ret->kinv=NULL; 17555714Skris ret->r=NULL; 17655714Skris ret->method_mont_p=NULL; 17755714Skris 17855714Skris ret->references=1; 179205128Ssimon ret->flags=ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW; 180109998Smarkm CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data); 18159191Skris if ((ret->meth->init != NULL) && !ret->meth->init(ret)) 18259191Skris { 183111147Snectar#ifndef OPENSSL_NO_ENGINE 184109998Smarkm if (ret->engine) 185109998Smarkm ENGINE_finish(ret->engine); 186111147Snectar#endif 187109998Smarkm CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data); 18868651Skris OPENSSL_free(ret); 18959191Skris ret=NULL; 19059191Skris } 19159191Skris 19255714Skris return(ret); 19355714Skris } 19455714Skris 19555714Skrisvoid DSA_free(DSA *r) 19655714Skris { 19755714Skris int i; 19855714Skris 19955714Skris if (r == NULL) return; 20055714Skris 20155714Skris i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA); 20255714Skris#ifdef REF_PRINT 20355714Skris REF_PRINT("DSA",r); 20455714Skris#endif 20555714Skris if (i > 0) return; 20655714Skris#ifdef REF_CHECK 20755714Skris if (i < 0) 20855714Skris { 20955714Skris fprintf(stderr,"DSA_free, bad reference count\n"); 21055714Skris abort(); 21155714Skris } 21255714Skris#endif 21355714Skris 214109998Smarkm if(r->meth->finish) 215109998Smarkm r->meth->finish(r); 216111147Snectar#ifndef OPENSSL_NO_ENGINE 217109998Smarkm if(r->engine) 218109998Smarkm ENGINE_finish(r->engine); 219111147Snectar#endif 22076866Skris 221109998Smarkm CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data); 22259191Skris 22355714Skris if (r->p != NULL) BN_clear_free(r->p); 22455714Skris if (r->q != NULL) BN_clear_free(r->q); 22555714Skris if (r->g != NULL) BN_clear_free(r->g); 22655714Skris if (r->pub_key != NULL) BN_clear_free(r->pub_key); 22755714Skris if (r->priv_key != NULL) BN_clear_free(r->priv_key); 22855714Skris if (r->kinv != NULL) BN_clear_free(r->kinv); 22955714Skris if (r->r != NULL) BN_clear_free(r->r); 23068651Skris OPENSSL_free(r); 23155714Skris } 23255714Skris 233109998Smarkmint DSA_up_ref(DSA *r) 23455714Skris { 235109998Smarkm int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA); 236109998Smarkm#ifdef REF_PRINT 237109998Smarkm REF_PRINT("DSA",r); 238109998Smarkm#endif 239109998Smarkm#ifdef REF_CHECK 240109998Smarkm if (i < 2) 241109998Smarkm { 242109998Smarkm fprintf(stderr, "DSA_up_ref, bad reference count\n"); 243109998Smarkm abort(); 244109998Smarkm } 245109998Smarkm#endif 246109998Smarkm return ((i > 1) ? 1 : 0); 247109998Smarkm } 248109998Smarkm 249238405Sjkimint DSA_size(const DSA *r) 250238405Sjkim { 251238405Sjkim int ret,i; 252238405Sjkim ASN1_INTEGER bs; 253238405Sjkim unsigned char buf[4]; /* 4 bytes looks really small. 254238405Sjkim However, i2d_ASN1_INTEGER() will not look 255238405Sjkim beyond the first byte, as long as the second 256238405Sjkim parameter is NULL. */ 257238405Sjkim 258238405Sjkim i=BN_num_bits(r->q); 259238405Sjkim bs.length=(i+7)/8; 260238405Sjkim bs.data=buf; 261238405Sjkim bs.type=V_ASN1_INTEGER; 262238405Sjkim /* If the top bit is set the asn1 encoding is 1 larger. */ 263238405Sjkim buf[0]=0xff; 264238405Sjkim 265238405Sjkim i=i2d_ASN1_INTEGER(&bs,NULL); 266238405Sjkim i+=i; /* r and s */ 267238405Sjkim ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE); 268238405Sjkim return(ret); 269238405Sjkim } 270238405Sjkim 27159191Skrisint DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 27259191Skris CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 27359191Skris { 274109998Smarkm return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp, 275109998Smarkm new_func, dup_func, free_func); 27659191Skris } 27759191Skris 27859191Skrisint DSA_set_ex_data(DSA *d, int idx, void *arg) 27959191Skris { 28059191Skris return(CRYPTO_set_ex_data(&d->ex_data,idx,arg)); 28159191Skris } 28259191Skris 28359191Skrisvoid *DSA_get_ex_data(DSA *d, int idx) 28459191Skris { 28559191Skris return(CRYPTO_get_ex_data(&d->ex_data,idx)); 28659191Skris } 28759191Skris 288109998Smarkm#ifndef OPENSSL_NO_DH 289109998SmarkmDH *DSA_dup_DH(const DSA *r) 29055714Skris { 29155714Skris /* DSA has p, q, g, optional pub_key, optional priv_key. 292238405Sjkim * DH has p, optional length, g, optional pub_key, optional priv_key, 293238405Sjkim * optional q. 29455714Skris */ 29555714Skris 29655714Skris DH *ret = NULL; 29755714Skris 29855714Skris if (r == NULL) 29955714Skris goto err; 30055714Skris ret = DH_new(); 30155714Skris if (ret == NULL) 30255714Skris goto err; 30355714Skris if (r->p != NULL) 30455714Skris if ((ret->p = BN_dup(r->p)) == NULL) 30555714Skris goto err; 30655714Skris if (r->q != NULL) 307238405Sjkim { 30855714Skris ret->length = BN_num_bits(r->q); 309238405Sjkim if ((ret->q = BN_dup(r->q)) == NULL) 310238405Sjkim goto err; 311238405Sjkim } 31255714Skris if (r->g != NULL) 31355714Skris if ((ret->g = BN_dup(r->g)) == NULL) 31455714Skris goto err; 31555714Skris if (r->pub_key != NULL) 31655714Skris if ((ret->pub_key = BN_dup(r->pub_key)) == NULL) 31755714Skris goto err; 31855714Skris if (r->priv_key != NULL) 31955714Skris if ((ret->priv_key = BN_dup(r->priv_key)) == NULL) 32055714Skris goto err; 32155714Skris 32255714Skris return ret; 32355714Skris 32455714Skris err: 32555714Skris if (ret != NULL) 32655714Skris DH_free(ret); 32755714Skris return NULL; 32855714Skris } 32955714Skris#endif 330