1 /* crypto/rand/rand_lib.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 <time.h> 61 #include "cryptlib.h" 62 #include <openssl/rand.h> 63 64 #ifndef OPENSSL_NO_ENGINE 65 #include <openssl/engine.h> 66 #endif 67 68 #ifdef OPENSSL_FIPS 69 #include <openssl/fips.h> 70 #include <openssl/fips_rand.h> 71 #include "rand_lcl.h" 72 #endif 73 74 #ifndef OPENSSL_NO_ENGINE 75 /* non-NULL if default_RAND_meth is ENGINE-provided */ 76 static ENGINE *funct_ref =NULL; 77 #endif 78 static const RAND_METHOD *default_RAND_meth = NULL; 79 80 int RAND_set_rand_method(const RAND_METHOD *meth) 81 { 82 #ifndef OPENSSL_NO_ENGINE 83 if(funct_ref) 84 { 85 ENGINE_finish(funct_ref); 86 funct_ref = NULL; 87 } 88 #endif 89 default_RAND_meth = meth; 90 return 1; 91 } 92 93 const RAND_METHOD *RAND_get_rand_method(void) 94 { 95 if (!default_RAND_meth) 96 { 97 #ifndef OPENSSL_NO_ENGINE 98 ENGINE *e = ENGINE_get_default_RAND(); 99 if(e) 100 { 101 default_RAND_meth = ENGINE_get_RAND(e); 102 if(!default_RAND_meth) 103 { 104 ENGINE_finish(e); 105 e = NULL; 106 } 107 } 108 if(e) 109 funct_ref = e; 110 else 111 #endif 112 default_RAND_meth = RAND_SSLeay(); 113 } 114 return default_RAND_meth; 115 } 116 117 #ifndef OPENSSL_NO_ENGINE 118 int RAND_set_rand_engine(ENGINE *engine) 119 { 120 const RAND_METHOD *tmp_meth = NULL; 121 if(engine) 122 { 123 if(!ENGINE_init(engine)) 124 return 0; 125 tmp_meth = ENGINE_get_RAND(engine); 126 if(!tmp_meth) 127 { 128 ENGINE_finish(engine); 129 return 0; 130 } 131 } 132 /* This function releases any prior ENGINE so call it first */ 133 RAND_set_rand_method(tmp_meth); 134 funct_ref = engine; 135 return 1; 136 } 137 #endif 138 139 void RAND_cleanup(void) 140 { 141 const RAND_METHOD *meth = RAND_get_rand_method(); 142 if (meth && meth->cleanup) 143 meth->cleanup(); 144 RAND_set_rand_method(NULL); 145 } 146 147 void RAND_seed(const void *buf, int num) 148 { 149 const RAND_METHOD *meth = RAND_get_rand_method(); 150 if (meth && meth->seed) 151 meth->seed(buf,num); 152 } 153 154 void RAND_add(const void *buf, int num, double entropy) 155 { 156 const RAND_METHOD *meth = RAND_get_rand_method(); 157 if (meth && meth->add) 158 meth->add(buf,num,entropy); 159 } 160 161 int RAND_bytes(unsigned char *buf, int num) 162 { 163 const RAND_METHOD *meth = RAND_get_rand_method(); 164 if (meth && meth->bytes) 165 return meth->bytes(buf,num); 166 return(-1); 167 } 168 169 int RAND_pseudo_bytes(unsigned char *buf, int num) 170 { 171 const RAND_METHOD *meth = RAND_get_rand_method(); 172 if (meth && meth->pseudorand) 173 return meth->pseudorand(buf,num); 174 return(-1); 175 } 176 177 int RAND_status(void) 178 { 179 const RAND_METHOD *meth = RAND_get_rand_method(); 180 if (meth && meth->status) 181 return meth->status(); 182 return 0; 183 } 184 185 #ifdef OPENSSL_FIPS 186 187 /* FIPS DRBG initialisation code. This sets up the DRBG for use by the 188 * rest of OpenSSL. 189 */ 190 191 /* Entropy gatherer: use standard OpenSSL PRNG to seed (this will gather 192 * entropy internally through RAND_poll(). 193 */ 194 195 static size_t drbg_get_entropy(DRBG_CTX *ctx, unsigned char **pout, 196 int entropy, size_t min_len, size_t max_len) 197 { 198 /* Round up request to multiple of block size */ 199 min_len = ((min_len + 19) / 20) * 20; 200 *pout = OPENSSL_malloc(min_len); 201 if (!*pout) 202 return 0; 203 if (ssleay_rand_bytes(*pout, min_len, 0, 0) <= 0) 204 { 205 OPENSSL_free(*pout); 206 *pout = NULL; 207 return 0; 208 } 209 return min_len; 210 } 211 212 static void drbg_free_entropy(DRBG_CTX *ctx, unsigned char *out, size_t olen) 213 { 214 if (out) 215 { 216 OPENSSL_cleanse(out, olen); 217 OPENSSL_free(out); 218 } 219 } 220 221 /* Set "additional input" when generating random data. This uses the 222 * current PID, a time value and a counter. 223 */ 224 225 static size_t drbg_get_adin(DRBG_CTX *ctx, unsigned char **pout) 226 { 227 /* Use of static variables is OK as this happens under a lock */ 228 static unsigned char buf[16]; 229 static unsigned long counter; 230 FIPS_get_timevec(buf, &counter); 231 *pout = buf; 232 return sizeof(buf); 233 } 234 235 /* RAND_add() and RAND_seed() pass through to OpenSSL PRNG so it is 236 * correctly seeded by RAND_poll(). 237 */ 238 239 static int drbg_rand_add(DRBG_CTX *ctx, const void *in, int inlen, 240 double entropy) 241 { 242 RAND_SSLeay()->add(in, inlen, entropy); 243 return 1; 244 } 245 246 static int drbg_rand_seed(DRBG_CTX *ctx, const void *in, int inlen) 247 { 248 RAND_SSLeay()->seed(in, inlen); 249 return 1; 250 } 251 252 #ifndef OPENSSL_DRBG_DEFAULT_TYPE 253 #define OPENSSL_DRBG_DEFAULT_TYPE NID_aes_256_ctr 254 #endif 255 #ifndef OPENSSL_DRBG_DEFAULT_FLAGS 256 #define OPENSSL_DRBG_DEFAULT_FLAGS DRBG_FLAG_CTR_USE_DF 257 #endif 258 259 static int fips_drbg_type = OPENSSL_DRBG_DEFAULT_TYPE; 260 static int fips_drbg_flags = OPENSSL_DRBG_DEFAULT_FLAGS; 261 262 void RAND_set_fips_drbg_type(int type, int flags) 263 { 264 fips_drbg_type = type; 265 fips_drbg_flags = flags; 266 } 267 268 int RAND_init_fips(void) 269 { 270 DRBG_CTX *dctx; 271 size_t plen; 272 unsigned char pers[32], *p; 273 #ifndef OPENSSL_ALLOW_DUAL_EC_DRBG 274 if (fips_drbg_type >> 16) 275 { 276 RANDerr(RAND_F_RAND_INIT_FIPS, RAND_R_DUAL_EC_DRBG_DISABLED); 277 return 0; 278 } 279 #endif 280 281 dctx = FIPS_get_default_drbg(); 282 if (FIPS_drbg_init(dctx, fips_drbg_type, fips_drbg_flags) <= 0) 283 { 284 RANDerr(RAND_F_RAND_INIT_FIPS, RAND_R_ERROR_INITIALISING_DRBG); 285 return 0; 286 } 287 288 FIPS_drbg_set_callbacks(dctx, 289 drbg_get_entropy, drbg_free_entropy, 20, 290 drbg_get_entropy, drbg_free_entropy); 291 FIPS_drbg_set_rand_callbacks(dctx, drbg_get_adin, 0, 292 drbg_rand_seed, drbg_rand_add); 293 /* Personalisation string: a string followed by date time vector */ 294 strcpy((char *)pers, "OpenSSL DRBG2.0"); 295 plen = drbg_get_adin(dctx, &p); 296 memcpy(pers + 16, p, plen); 297 298 if (FIPS_drbg_instantiate(dctx, pers, sizeof(pers)) <= 0) 299 { 300 RANDerr(RAND_F_RAND_INIT_FIPS, RAND_R_ERROR_INSTANTIATING_DRBG); 301 return 0; 302 } 303 FIPS_rand_set_method(FIPS_drbg_method()); 304 return 1; 305 } 306 307 #endif 308
