rsa_lib.c revision 306195
1/* crypto/rsa/rsa_lib.c */ 2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59#include <stdio.h> 60#include <openssl/crypto.h> 61#include "cryptlib.h" 62#include <openssl/lhash.h> 63#include <openssl/bn.h> 64#include <openssl/rsa.h> 65#include <openssl/rand.h> 66#ifndef OPENSSL_NO_ENGINE 67# include <openssl/engine.h> 68#endif 69 70#ifdef OPENSSL_FIPS 71# include <openssl/fips.h> 72#endif 73 74const char RSA_version[] = "RSA" OPENSSL_VERSION_PTEXT; 75 76static const RSA_METHOD *default_RSA_meth = NULL; 77 78RSA *RSA_new(void) 79{ 80 RSA *r = RSA_new_method(NULL); 81 82 return r; 83} 84 85void RSA_set_default_method(const RSA_METHOD *meth) 86{ 87 default_RSA_meth = meth; 88} 89 90const RSA_METHOD *RSA_get_default_method(void) 91{ 92 if (default_RSA_meth == NULL) { 93#ifdef OPENSSL_FIPS 94 if (FIPS_mode()) 95 return FIPS_rsa_pkcs1_ssleay(); 96 else 97 return RSA_PKCS1_SSLeay(); 98#else 99# ifdef RSA_NULL 100 default_RSA_meth = RSA_null_method(); 101# else 102 default_RSA_meth = RSA_PKCS1_SSLeay(); 103# endif 104#endif 105 } 106 107 return default_RSA_meth; 108} 109 110const RSA_METHOD *RSA_get_method(const RSA *rsa) 111{ 112 return rsa->meth; 113} 114 115int RSA_set_method(RSA *rsa, const RSA_METHOD *meth) 116{ 117 /* 118 * NB: The caller is specifically setting a method, so it's not up to us 119 * to deal with which ENGINE it comes from. 120 */ 121 const RSA_METHOD *mtmp; 122 mtmp = rsa->meth; 123 if (mtmp->finish) 124 mtmp->finish(rsa); 125#ifndef OPENSSL_NO_ENGINE 126 if (rsa->engine) { 127 ENGINE_finish(rsa->engine); 128 rsa->engine = NULL; 129 } 130#endif 131 rsa->meth = meth; 132 if (meth->init) 133 meth->init(rsa); 134 return 1; 135} 136 137RSA *RSA_new_method(ENGINE *engine) 138{ 139 RSA *ret; 140 141 ret = (RSA *)OPENSSL_malloc(sizeof(RSA)); 142 if (ret == NULL) { 143 RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_MALLOC_FAILURE); 144 return NULL; 145 } 146 memset(ret,0,sizeof(RSA)); 147 148 ret->meth = RSA_get_default_method(); 149#ifndef OPENSSL_NO_ENGINE 150 if (engine) { 151 if (!ENGINE_init(engine)) { 152 RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_ENGINE_LIB); 153 OPENSSL_free(ret); 154 return NULL; 155 } 156 ret->engine = engine; 157 } else 158 ret->engine = ENGINE_get_default_RSA(); 159 if (ret->engine) { 160 ret->meth = ENGINE_get_RSA(ret->engine); 161 if (!ret->meth) { 162 RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_ENGINE_LIB); 163 ENGINE_finish(ret->engine); 164 OPENSSL_free(ret); 165 return NULL; 166 } 167 } 168#endif 169 170 ret->pad = 0; 171 ret->version = 0; 172 ret->n = NULL; 173 ret->e = NULL; 174 ret->d = NULL; 175 ret->p = NULL; 176 ret->q = NULL; 177 ret->dmp1 = NULL; 178 ret->dmq1 = NULL; 179 ret->iqmp = NULL; 180 ret->references = 1; 181 ret->_method_mod_n = NULL; 182 ret->_method_mod_p = NULL; 183 ret->_method_mod_q = NULL; 184 ret->blinding = NULL; 185 ret->mt_blinding = NULL; 186 ret->bignum_data = NULL; 187 ret->flags = ret->meth->flags & ~RSA_FLAG_NON_FIPS_ALLOW; 188 if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data)) { 189#ifndef OPENSSL_NO_ENGINE 190 if (ret->engine) 191 ENGINE_finish(ret->engine); 192#endif 193 OPENSSL_free(ret); 194 return (NULL); 195 } 196 197 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) { 198#ifndef OPENSSL_NO_ENGINE 199 if (ret->engine) 200 ENGINE_finish(ret->engine); 201#endif 202 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data); 203 OPENSSL_free(ret); 204 ret = NULL; 205 } 206 return (ret); 207} 208 209void RSA_free(RSA *r) 210{ 211 int i; 212 213 if (r == NULL) 214 return; 215 216 i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_RSA); 217#ifdef REF_PRINT 218 REF_PRINT("RSA", r); 219#endif 220 if (i > 0) 221 return; 222#ifdef REF_CHECK 223 if (i < 0) { 224 fprintf(stderr, "RSA_free, bad reference count\n"); 225 abort(); 226 } 227#endif 228 229 if (r->meth->finish) 230 r->meth->finish(r); 231#ifndef OPENSSL_NO_ENGINE 232 if (r->engine) 233 ENGINE_finish(r->engine); 234#endif 235 236 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, r, &r->ex_data); 237 238 if (r->n != NULL) 239 BN_clear_free(r->n); 240 if (r->e != NULL) 241 BN_clear_free(r->e); 242 if (r->d != NULL) 243 BN_clear_free(r->d); 244 if (r->p != NULL) 245 BN_clear_free(r->p); 246 if (r->q != NULL) 247 BN_clear_free(r->q); 248 if (r->dmp1 != NULL) 249 BN_clear_free(r->dmp1); 250 if (r->dmq1 != NULL) 251 BN_clear_free(r->dmq1); 252 if (r->iqmp != NULL) 253 BN_clear_free(r->iqmp); 254 if (r->blinding != NULL) 255 BN_BLINDING_free(r->blinding); 256 if (r->mt_blinding != NULL) 257 BN_BLINDING_free(r->mt_blinding); 258 if (r->bignum_data != NULL) 259 OPENSSL_free_locked(r->bignum_data); 260 OPENSSL_free(r); 261} 262 263int RSA_up_ref(RSA *r) 264{ 265 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_RSA); 266#ifdef REF_PRINT 267 REF_PRINT("RSA", r); 268#endif 269#ifdef REF_CHECK 270 if (i < 2) { 271 fprintf(stderr, "RSA_up_ref, bad reference count\n"); 272 abort(); 273 } 274#endif 275 return ((i > 1) ? 1 : 0); 276} 277 278int RSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 279 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 280{ 281 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_RSA, argl, argp, 282 new_func, dup_func, free_func); 283} 284 285int RSA_set_ex_data(RSA *r, int idx, void *arg) 286{ 287 return (CRYPTO_set_ex_data(&r->ex_data, idx, arg)); 288} 289 290void *RSA_get_ex_data(const RSA *r, int idx) 291{ 292 return (CRYPTO_get_ex_data(&r->ex_data, idx)); 293} 294 295int RSA_memory_lock(RSA *r) 296{ 297 int i, j, k, off; 298 char *p; 299 BIGNUM *bn, **t[6], *b; 300 BN_ULONG *ul; 301 302 if (r->d == NULL) 303 return (1); 304 t[0] = &r->d; 305 t[1] = &r->p; 306 t[2] = &r->q; 307 t[3] = &r->dmp1; 308 t[4] = &r->dmq1; 309 t[5] = &r->iqmp; 310 k = sizeof(BIGNUM) * 6; 311 off = k / sizeof(BN_ULONG) + 1; 312 j = 1; 313 for (i = 0; i < 6; i++) 314 j += (*t[i])->top; 315 if ((p = OPENSSL_malloc_locked((off + j) * sizeof(BN_ULONG))) == NULL) { 316 RSAerr(RSA_F_RSA_MEMORY_LOCK, ERR_R_MALLOC_FAILURE); 317 return (0); 318 } 319 bn = (BIGNUM *)p; 320 ul = (BN_ULONG *)&(p[off]); 321 for (i = 0; i < 6; i++) { 322 b = *(t[i]); 323 *(t[i]) = &(bn[i]); 324 memcpy((char *)&(bn[i]), (char *)b, sizeof(BIGNUM)); 325 bn[i].flags = BN_FLG_STATIC_DATA; 326 bn[i].d = ul; 327 memcpy((char *)ul, b->d, sizeof(BN_ULONG) * b->top); 328 ul += b->top; 329 BN_clear_free(b); 330 } 331 332 /* I should fix this so it can still be done */ 333 r->flags &= ~(RSA_FLAG_CACHE_PRIVATE | RSA_FLAG_CACHE_PUBLIC); 334 335 r->bignum_data = p; 336 return (1); 337} 338