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. 8280304Sjkim * 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). 15280304Sjkim * 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. 22280304Sjkim * 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 :-). 37280304Sjkim * 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)" 40280304Sjkim * 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. 52280304Sjkim * 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 67280304Sjkim# include <openssl/engine.h> 68111147Snectar#endif 69160814Ssimon#ifndef OPENSSL_NO_DH 70280304Sjkim# include <openssl/dh.h> 71160814Ssimon#endif 7255714Skris 73238405Sjkim#ifdef OPENSSL_FIPS 74280304Sjkim# include <openssl/fips.h> 75238405Sjkim#endif 76238405Sjkim 77280304Sjkimconst 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) 82280304Sjkim{ 83280304Sjkim default_DSA_method = meth; 84280304Sjkim} 8559191Skris 86109998Smarkmconst DSA_METHOD *DSA_get_default_method(void) 87280304Sjkim{ 88280304Sjkim if (!default_DSA_method) { 89238405Sjkim#ifdef OPENSSL_FIPS 90280304Sjkim if (FIPS_mode()) 91280304Sjkim return FIPS_dsa_openssl(); 92280304Sjkim else 93280304Sjkim return DSA_OpenSSL(); 94238405Sjkim#else 95280304Sjkim default_DSA_method = DSA_OpenSSL(); 96238405Sjkim#endif 97280304Sjkim } 98280304Sjkim return default_DSA_method; 99280304Sjkim} 10059191Skris 10155714SkrisDSA *DSA_new(void) 102280304Sjkim{ 103280304Sjkim return DSA_new_method(NULL); 104280304Sjkim} 10559191Skris 106109998Smarkmint DSA_set_method(DSA *dsa, const DSA_METHOD *meth) 107280304Sjkim{ 108280304Sjkim /* 109280304Sjkim * NB: The caller is specifically setting a method, so it's not up to us 110280304Sjkim * to deal with which ENGINE it comes from. 111280304Sjkim */ 112280304Sjkim const DSA_METHOD *mtmp; 113280304Sjkim mtmp = dsa->meth; 114280304Sjkim if (mtmp->finish) 115280304Sjkim mtmp->finish(dsa); 116111147Snectar#ifndef OPENSSL_NO_ENGINE 117280304Sjkim if (dsa->engine) { 118280304Sjkim ENGINE_finish(dsa->engine); 119280304Sjkim dsa->engine = NULL; 120280304Sjkim } 121111147Snectar#endif 122280304Sjkim dsa->meth = meth; 123280304Sjkim if (meth->init) 124280304Sjkim meth->init(dsa); 125280304Sjkim return 1; 126280304Sjkim} 12759191Skris 128109998SmarkmDSA *DSA_new_method(ENGINE *engine) 129280304Sjkim{ 130280304Sjkim DSA *ret; 13155714Skris 132280304Sjkim ret = (DSA *)OPENSSL_malloc(sizeof(DSA)); 133280304Sjkim if (ret == NULL) { 134280304Sjkim DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_MALLOC_FAILURE); 135280304Sjkim return (NULL); 136280304Sjkim } 137280304Sjkim ret->meth = DSA_get_default_method(); 138111147Snectar#ifndef OPENSSL_NO_ENGINE 139280304Sjkim if (engine) { 140280304Sjkim if (!ENGINE_init(engine)) { 141280304Sjkim DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB); 142280304Sjkim OPENSSL_free(ret); 143280304Sjkim return NULL; 144280304Sjkim } 145280304Sjkim ret->engine = engine; 146280304Sjkim } else 147280304Sjkim ret->engine = ENGINE_get_default_DSA(); 148280304Sjkim if (ret->engine) { 149280304Sjkim ret->meth = ENGINE_get_DSA(ret->engine); 150280304Sjkim if (!ret->meth) { 151280304Sjkim DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB); 152280304Sjkim ENGINE_finish(ret->engine); 153280304Sjkim OPENSSL_free(ret); 154280304Sjkim return NULL; 155280304Sjkim } 156280304Sjkim } 157111147Snectar#endif 158109998Smarkm 159280304Sjkim ret->pad = 0; 160280304Sjkim ret->version = 0; 161280304Sjkim ret->write_params = 1; 162280304Sjkim ret->p = NULL; 163280304Sjkim ret->q = NULL; 164280304Sjkim ret->g = NULL; 16555714Skris 166280304Sjkim ret->pub_key = NULL; 167280304Sjkim ret->priv_key = NULL; 16855714Skris 169280304Sjkim ret->kinv = NULL; 170280304Sjkim ret->r = NULL; 171280304Sjkim ret->method_mont_p = NULL; 17255714Skris 173280304Sjkim ret->references = 1; 174280304Sjkim ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW; 175280304Sjkim CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data); 176280304Sjkim if ((ret->meth->init != NULL) && !ret->meth->init(ret)) { 177111147Snectar#ifndef OPENSSL_NO_ENGINE 178280304Sjkim if (ret->engine) 179280304Sjkim ENGINE_finish(ret->engine); 180111147Snectar#endif 181280304Sjkim CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data); 182280304Sjkim OPENSSL_free(ret); 183280304Sjkim ret = NULL; 184280304Sjkim } 18555714Skris 186280304Sjkim return (ret); 187280304Sjkim} 188280304Sjkim 18955714Skrisvoid DSA_free(DSA *r) 190280304Sjkim{ 191280304Sjkim int i; 19255714Skris 193280304Sjkim if (r == NULL) 194280304Sjkim return; 19555714Skris 196280304Sjkim i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DSA); 19755714Skris#ifdef REF_PRINT 198280304Sjkim REF_PRINT("DSA", r); 19955714Skris#endif 200280304Sjkim if (i > 0) 201280304Sjkim return; 20255714Skris#ifdef REF_CHECK 203280304Sjkim if (i < 0) { 204280304Sjkim fprintf(stderr, "DSA_free, bad reference count\n"); 205280304Sjkim abort(); 206280304Sjkim } 20755714Skris#endif 20855714Skris 209280304Sjkim if (r->meth->finish) 210280304Sjkim r->meth->finish(r); 211111147Snectar#ifndef OPENSSL_NO_ENGINE 212280304Sjkim if (r->engine) 213280304Sjkim ENGINE_finish(r->engine); 214111147Snectar#endif 21576866Skris 216280304Sjkim CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data); 21759191Skris 218280304Sjkim if (r->p != NULL) 219280304Sjkim BN_clear_free(r->p); 220280304Sjkim if (r->q != NULL) 221280304Sjkim BN_clear_free(r->q); 222280304Sjkim if (r->g != NULL) 223280304Sjkim BN_clear_free(r->g); 224280304Sjkim if (r->pub_key != NULL) 225280304Sjkim BN_clear_free(r->pub_key); 226280304Sjkim if (r->priv_key != NULL) 227280304Sjkim BN_clear_free(r->priv_key); 228280304Sjkim if (r->kinv != NULL) 229280304Sjkim BN_clear_free(r->kinv); 230280304Sjkim if (r->r != NULL) 231280304Sjkim BN_clear_free(r->r); 232280304Sjkim OPENSSL_free(r); 233280304Sjkim} 23455714Skris 235109998Smarkmint DSA_up_ref(DSA *r) 236280304Sjkim{ 237280304Sjkim int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA); 238109998Smarkm#ifdef REF_PRINT 239280304Sjkim REF_PRINT("DSA", r); 240109998Smarkm#endif 241109998Smarkm#ifdef REF_CHECK 242280304Sjkim if (i < 2) { 243280304Sjkim fprintf(stderr, "DSA_up_ref, bad reference count\n"); 244280304Sjkim abort(); 245280304Sjkim } 246109998Smarkm#endif 247280304Sjkim return ((i > 1) ? 1 : 0); 248280304Sjkim} 249109998Smarkm 250238405Sjkimint DSA_size(const DSA *r) 251280304Sjkim{ 252280304Sjkim int ret, i; 253280304Sjkim ASN1_INTEGER bs; 254280304Sjkim unsigned char buf[4]; /* 4 bytes looks really small. However, 255280304Sjkim * i2d_ASN1_INTEGER() will not look beyond 256280304Sjkim * the first byte, as long as the second 257280304Sjkim * parameter is NULL. */ 258238405Sjkim 259280304Sjkim i = BN_num_bits(r->q); 260280304Sjkim bs.length = (i + 7) / 8; 261280304Sjkim bs.data = buf; 262280304Sjkim bs.type = V_ASN1_INTEGER; 263280304Sjkim /* If the top bit is set the asn1 encoding is 1 larger. */ 264280304Sjkim buf[0] = 0xff; 265238405Sjkim 266280304Sjkim i = i2d_ASN1_INTEGER(&bs, NULL); 267280304Sjkim i += i; /* r and s */ 268280304Sjkim ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE); 269280304Sjkim return (ret); 270280304Sjkim} 271238405Sjkim 27259191Skrisint DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 273280304Sjkim CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 274280304Sjkim{ 275280304Sjkim return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp, 276280304Sjkim new_func, dup_func, free_func); 277280304Sjkim} 27859191Skris 27959191Skrisint DSA_set_ex_data(DSA *d, int idx, void *arg) 280280304Sjkim{ 281280304Sjkim return (CRYPTO_set_ex_data(&d->ex_data, idx, arg)); 282280304Sjkim} 28359191Skris 28459191Skrisvoid *DSA_get_ex_data(DSA *d, int idx) 285280304Sjkim{ 286280304Sjkim return (CRYPTO_get_ex_data(&d->ex_data, idx)); 287280304Sjkim} 28859191Skris 289109998Smarkm#ifndef OPENSSL_NO_DH 290109998SmarkmDH *DSA_dup_DH(const DSA *r) 291280304Sjkim{ 292280304Sjkim /* 293280304Sjkim * DSA has p, q, g, optional pub_key, optional priv_key. DH has p, 294280304Sjkim * optional length, g, optional pub_key, optional priv_key, optional q. 295280304Sjkim */ 29655714Skris 297280304Sjkim DH *ret = NULL; 29855714Skris 299280304Sjkim if (r == NULL) 300280304Sjkim goto err; 301280304Sjkim ret = DH_new(); 302280304Sjkim if (ret == NULL) 303280304Sjkim goto err; 304280304Sjkim if (r->p != NULL) 305280304Sjkim if ((ret->p = BN_dup(r->p)) == NULL) 306280304Sjkim goto err; 307280304Sjkim if (r->q != NULL) { 308280304Sjkim ret->length = BN_num_bits(r->q); 309280304Sjkim if ((ret->q = BN_dup(r->q)) == NULL) 310280304Sjkim goto err; 311280304Sjkim } 312280304Sjkim if (r->g != NULL) 313280304Sjkim if ((ret->g = BN_dup(r->g)) == NULL) 314280304Sjkim goto err; 315280304Sjkim if (r->pub_key != NULL) 316280304Sjkim if ((ret->pub_key = BN_dup(r->pub_key)) == NULL) 317280304Sjkim goto err; 318280304Sjkim if (r->priv_key != NULL) 319280304Sjkim if ((ret->priv_key = BN_dup(r->priv_key)) == NULL) 320280304Sjkim goto err; 32155714Skris 322280304Sjkim return ret; 32355714Skris 32455714Skris err: 325280304Sjkim if (ret != NULL) 326280304Sjkim DH_free(ret); 327280304Sjkim return NULL; 328280304Sjkim} 32955714Skris#endif 330