dsa_lib.c revision 296341
1132718Skan/* crypto/dsa/dsa_lib.c */ 2189824Sdas/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3189824Sdas * All rights reserved. 4132718Skan * 5132718Skan * This package is an SSL implementation written 6132718Skan * by Eric Young (eay@cryptsoft.com). 7132718Skan * The implementation was written so as to conform with Netscapes SSL. 8132718Skan * 9132718Skan * This library is free for commercial and non-commercial use as long as 10132718Skan * the following conditions are aheared to. The following conditions 11132718Skan * apply to all code found in this distribution, be it the RC4, RSA, 12132718Skan * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13132718Skan * included with this distribution is covered by the same copyright terms 14132718Skan * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15132718Skan * 16132718Skan * Copyright remains Eric Young's, and as such any Copyright notices in 17132718Skan * the code are not to be removed. 18132718Skan * If this package is used in a product, Eric Young should be given attribution 19169689Skan * as the author of the parts of the library used. 20169689Skan * This can be in the form of a textual message at program startup or 21132718Skan * in documentation (online or textual) provided with the package. 22132718Skan * 23132718Skan * Redistribution and use in source and binary forms, with or without 24132718Skan * modification, are permitted provided that the following conditions 25132718Skan * are met: 26132718Skan * 1. Redistributions of source code must retain the copyright 27169689Skan * notice, this list of conditions and the following disclaimer. 28132718Skan * 2. Redistributions in binary form must reproduce the above copyright 29132718Skan * notice, this list of conditions and the following disclaimer in the 30132718Skan * documentation and/or other materials provided with the distribution. 31132718Skan * 3. All advertising materials mentioning features or use of this software 32132718Skan * must display the following acknowledgement: 33132718Skan * "This product includes cryptographic software written by 34132718Skan * Eric Young (eay@cryptsoft.com)" 35132718Skan * The word 'cryptographic' can be left out if the rouines from the library 36169689Skan * being used are not cryptographic related :-). 37132718Skan * 4. If you include any Windows specific code (or a derivative thereof) from 38132718Skan * the apps directory (application code) you must include an acknowledgement: 39132718Skan * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40132718Skan * 41132718Skan * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42132718Skan * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43132718Skan * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44132718Skan * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45132718Skan * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46132718Skan * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47132718Skan * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48132718Skan * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49132718Skan * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50132718Skan * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51132718Skan * SUCH DAMAGE. 52132718Skan * 53132718Skan * The licence and distribution terms for any publically available version or 54132718Skan * derivative of this code cannot be changed. i.e. this code cannot simply be 55132718Skan * copied and put under another distribution licence 56132718Skan * [including the GNU Public Licence.] 57169689Skan */ 58132718Skan 59169689Skan/* Original version from Steven Schoch <schoch@sheba.arc.nasa.gov> */ 60132718Skan 61132718Skan#include <stdio.h> 62169689Skan#include "cryptlib.h" 63169689Skan#include <openssl/bn.h> 64169689Skan#include <openssl/dsa.h> 65132718Skan#include <openssl/asn1.h> 66132718Skan#ifndef OPENSSL_NO_ENGINE 67132718Skan# include <openssl/engine.h> 68132718Skan#endif 69132718Skan#ifndef OPENSSL_NO_DH 70132718Skan# include <openssl/dh.h> 71132718Skan#endif 72132718Skan 73132718Skan#ifdef OPENSSL_FIPS 74132718Skan# include <openssl/fips.h> 75169689Skan#endif 76169689Skan 77132718Skanconst char DSA_version[] = "DSA" OPENSSL_VERSION_PTEXT; 78169689Skan 79169689Skanstatic const DSA_METHOD *default_DSA_method = NULL; 80169689Skan 81169689Skanvoid DSA_set_default_method(const DSA_METHOD *meth) 82132718Skan{ 83132718Skan default_DSA_method = meth; 84132718Skan} 85132718Skan 86132718Skanconst DSA_METHOD *DSA_get_default_method(void) 87132718Skan{ 88132718Skan if (!default_DSA_method) { 89132718Skan#ifdef OPENSSL_FIPS 90132718Skan if (FIPS_mode()) 91132718Skan return FIPS_dsa_openssl(); 92132718Skan else 93132718Skan return DSA_OpenSSL(); 94132718Skan#else 95132718Skan default_DSA_method = DSA_OpenSSL(); 96132718Skan#endif 97132718Skan } 98132718Skan return default_DSA_method; 99132718Skan} 100169689Skan 101132718SkanDSA *DSA_new(void) 102132718Skan{ 103132718Skan return DSA_new_method(NULL); 104132718Skan} 105132718Skan 106132718Skanint DSA_set_method(DSA *dsa, const DSA_METHOD *meth) 107132718Skan{ 108132718Skan /* 109132718Skan * NB: The caller is specifically setting a method, so it's not up to us 110132718Skan * to deal with which ENGINE it comes from. 111132718Skan */ 112132718Skan const DSA_METHOD *mtmp; 113132718Skan mtmp = dsa->meth; 114132718Skan if (mtmp->finish) 115132718Skan mtmp->finish(dsa); 116132718Skan#ifndef OPENSSL_NO_ENGINE 117132718Skan if (dsa->engine) { 118132718Skan ENGINE_finish(dsa->engine); 119132718Skan dsa->engine = NULL; 120132718Skan } 121132718Skan#endif 122132718Skan dsa->meth = meth; 123132718Skan if (meth->init) 124132718Skan meth->init(dsa); 125132718Skan return 1; 126132718Skan} 127132718Skan 128132718SkanDSA *DSA_new_method(ENGINE *engine) 129132718Skan{ 130132718Skan DSA *ret; 131132718Skan 132132718Skan ret = (DSA *)OPENSSL_malloc(sizeof(DSA)); 133132718Skan if (ret == NULL) { 134132718Skan DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_MALLOC_FAILURE); 135132718Skan return (NULL); 136132718Skan } 137132718Skan ret->meth = DSA_get_default_method(); 138132718Skan#ifndef OPENSSL_NO_ENGINE 139132718Skan if (engine) { 140132718Skan if (!ENGINE_init(engine)) { 141132718Skan DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB); 142132718Skan OPENSSL_free(ret); 143132718Skan return NULL; 144132718Skan } 145132718Skan ret->engine = engine; 146132718Skan } else 147132718Skan ret->engine = ENGINE_get_default_DSA(); 148132718Skan if (ret->engine) { 149132718Skan ret->meth = ENGINE_get_DSA(ret->engine); 150132718Skan if (!ret->meth) { 151132718Skan DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB); 152132718Skan ENGINE_finish(ret->engine); 153132718Skan OPENSSL_free(ret); 154132718Skan return NULL; 155132718Skan } 156132718Skan } 157132718Skan#endif 158132718Skan 159132718Skan ret->pad = 0; 160132718Skan ret->version = 0; 161132718Skan ret->write_params = 1; 162132718Skan ret->p = NULL; 163132718Skan ret->q = NULL; 164132718Skan ret->g = NULL; 165132718Skan 166132718Skan ret->pub_key = NULL; 167132718Skan ret->priv_key = NULL; 168132718Skan 169132718Skan ret->kinv = NULL; 170132718Skan ret->r = NULL; 171132718Skan ret->method_mont_p = NULL; 172132718Skan 173132718Skan ret->references = 1; 174132718Skan ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW; 175132718Skan CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data); 176132718Skan if ((ret->meth->init != NULL) && !ret->meth->init(ret)) { 177132718Skan#ifndef OPENSSL_NO_ENGINE 178132718Skan if (ret->engine) 179132718Skan ENGINE_finish(ret->engine); 180132718Skan#endif 181132718Skan CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data); 182132718Skan OPENSSL_free(ret); 183132718Skan ret = NULL; 184132718Skan } 185132718Skan 186132718Skan return (ret); 187132718Skan} 188132718Skan 189132718Skanvoid DSA_free(DSA *r) 190132718Skan{ 191132718Skan int i; 192132718Skan 193132718Skan if (r == NULL) 194132718Skan return; 195132718Skan 196132718Skan i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DSA); 197132718Skan#ifdef REF_PRINT 198132718Skan REF_PRINT("DSA", r); 199132718Skan#endif 200132718Skan if (i > 0) 201132718Skan return; 202132718Skan#ifdef REF_CHECK 203132718Skan if (i < 0) { 204132718Skan fprintf(stderr, "DSA_free, bad reference count\n"); 205132718Skan abort(); 206132718Skan } 207132718Skan#endif 208132718Skan 209132718Skan if (r->meth->finish) 210132718Skan r->meth->finish(r); 211132718Skan#ifndef OPENSSL_NO_ENGINE 212132718Skan if (r->engine) 213132718Skan ENGINE_finish(r->engine); 214132718Skan#endif 215132718Skan 216132718Skan CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data); 217132718Skan 218132718Skan if (r->p != NULL) 219132718Skan BN_clear_free(r->p); 220169689Skan if (r->q != NULL) 221132718Skan BN_clear_free(r->q); 222132718Skan if (r->g != NULL) 223132718Skan BN_clear_free(r->g); 224132718Skan if (r->pub_key != NULL) 225132718Skan BN_clear_free(r->pub_key); 226169689Skan if (r->priv_key != NULL) 227132718Skan BN_clear_free(r->priv_key); 228132718Skan if (r->kinv != NULL) 229132718Skan BN_clear_free(r->kinv); 230132718Skan if (r->r != NULL) 231169689Skan BN_clear_free(r->r); 232169689Skan OPENSSL_free(r); 233169689Skan} 234169689Skan 235169689Skanint DSA_up_ref(DSA *r) 236169689Skan{ 237169689Skan int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA); 238132718Skan#ifdef REF_PRINT 239132718Skan REF_PRINT("DSA", r); 240132718Skan#endif 241132718Skan#ifdef REF_CHECK 242132718Skan if (i < 2) { 243132718Skan fprintf(stderr, "DSA_up_ref, bad reference count\n"); 244132718Skan abort(); 245132718Skan } 246132718Skan#endif 247169689Skan return ((i > 1) ? 1 : 0); 248132718Skan} 249132718Skan 250132718Skanint DSA_size(const DSA *r) 251132718Skan{ 252132718Skan int ret, i; 253132718Skan ASN1_INTEGER bs; 254132718Skan unsigned char buf[4]; /* 4 bytes looks really small. However, 255169689Skan * i2d_ASN1_INTEGER() will not look beyond 256169689Skan * the first byte, as long as the second 257169689Skan * parameter is NULL. */ 258132718Skan 259132718Skan i = BN_num_bits(r->q); 260132718Skan bs.length = (i + 7) / 8; 261132718Skan bs.data = buf; 262132718Skan bs.type = V_ASN1_INTEGER; 263132718Skan /* If the top bit is set the asn1 encoding is 1 larger. */ 264132718Skan buf[0] = 0xff; 265132718Skan 266132718Skan i = i2d_ASN1_INTEGER(&bs, NULL); 267132718Skan i += i; /* r and s */ 268132718Skan ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE); 269132718Skan return (ret); 270132718Skan} 271169689Skan 272169689Skanint DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 273169689Skan CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 274169689Skan{ 275169689Skan return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp, 276169689Skan new_func, dup_func, free_func); 277169689Skan} 278169689Skan 279169689Skanint DSA_set_ex_data(DSA *d, int idx, void *arg) 280169689Skan{ 281169689Skan return (CRYPTO_set_ex_data(&d->ex_data, idx, arg)); 282169689Skan} 283169689Skan 284169689Skanvoid *DSA_get_ex_data(DSA *d, int idx) 285169689Skan{ 286169689Skan return (CRYPTO_get_ex_data(&d->ex_data, idx)); 287169689Skan} 288169689Skan 289169689Skan#ifndef OPENSSL_NO_DH 290169689SkanDH *DSA_dup_DH(const DSA *r) 291169689Skan{ 292169689Skan /* 293169689Skan * DSA has p, q, g, optional pub_key, optional priv_key. DH has p, 294169689Skan * optional length, g, optional pub_key, optional priv_key, optional q. 295169689Skan */ 296169689Skan 297169689Skan DH *ret = NULL; 298169689Skan 299169689Skan if (r == NULL) 300169689Skan goto err; 301169689Skan ret = DH_new(); 302169689Skan if (ret == NULL) 303169689Skan goto err; 304169689Skan if (r->p != NULL) 305169689Skan if ((ret->p = BN_dup(r->p)) == NULL) 306169689Skan goto err; 307169689Skan if (r->q != NULL) { 308169689Skan ret->length = BN_num_bits(r->q); 309169689Skan if ((ret->q = BN_dup(r->q)) == NULL) 310169689Skan goto err; 311169689Skan } 312169689Skan if (r->g != NULL) 313169689Skan if ((ret->g = BN_dup(r->g)) == NULL) 314169689Skan goto err; 315169689Skan if (r->pub_key != NULL) 316169689Skan if ((ret->pub_key = BN_dup(r->pub_key)) == NULL) 317169689Skan goto err; 318169689Skan if (r->priv_key != NULL) 319169689Skan if ((ret->priv_key = BN_dup(r->priv_key)) == NULL) 320169689Skan goto err; 321169689Skan 322169689Skan return ret; 323169689Skan 324169689Skan err: 325169689Skan if (ret != NULL) 326169689Skan DH_free(ret); 327169689Skan return NULL; 328169689Skan} 329169689Skan#endif 330169689Skan