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| 1 /* crypto/rand/rand_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 <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 #endif | |
| 72 | |
| 73 #ifndef OPENSSL_NO_ENGINE | |
| 74 /* non-NULL if default_RAND_meth is ENGINE-provided */ | |
| 75 static ENGINE *funct_ref =NULL; | |
| 76 #endif | |
| 77 static const RAND_METHOD *default_RAND_meth = NULL; | |
| 78 | |
| 79 int RAND_set_rand_method(const RAND_METHOD *meth) | |
| 80 { | |
| 81 #ifndef OPENSSL_NO_ENGINE | |
| 82 if(funct_ref) | |
| 83 { | |
| 84 ENGINE_finish(funct_ref); | |
| 85 funct_ref = NULL; | |
| 86 } | |
| 87 #endif | |
| 88 default_RAND_meth = meth; | |
| 89 return 1; | |
| 90 } | |
| 91 | |
| 92 const RAND_METHOD *RAND_get_rand_method(void) | |
| 93 { | |
| 94 if (!default_RAND_meth) | |
| 95 { | |
| 96 #ifndef OPENSSL_NO_ENGINE | |
| 97 ENGINE *e = ENGINE_get_default_RAND(); | |
| 98 if(e) | |
| 99 { | |
| 100 default_RAND_meth = ENGINE_get_RAND(e); | |
| 101 if(!default_RAND_meth) | |
| 102 { | |
| 103 ENGINE_finish(e); | |
| 104 e = NULL; | |
| 105 } | |
| 106 } | |
| 107 if(e) | |
| 108 funct_ref = e; | |
| 109 else | |
| 110 #endif | |
| 111 default_RAND_meth = RAND_SSLeay(); | |
| 112 } | |
| 113 return default_RAND_meth; | |
| 114 } | |
| 115 | |
| 116 #ifndef OPENSSL_NO_ENGINE | |
| 117 int RAND_set_rand_engine(ENGINE *engine) | |
| 118 { | |
| 119 const RAND_METHOD *tmp_meth = NULL; | |
| 120 if(engine) | |
| 121 { | |
| 122 if(!ENGINE_init(engine)) | |
| 123 return 0; | |
| 124 tmp_meth = ENGINE_get_RAND(engine); | |
| 125 if(!tmp_meth) | |
| 126 { | |
| 127 ENGINE_finish(engine); | |
| 128 return 0; | |
| 129 } | |
| 130 } | |
| 131 /* This function releases any prior ENGINE so call it first */ | |
| 132 RAND_set_rand_method(tmp_meth); | |
| 133 funct_ref = engine; | |
| 134 return 1; | |
| 135 } | |
| 136 #endif | |
| 137 | |
| 138 void RAND_cleanup(void) | |
| 139 { | |
| 140 const RAND_METHOD *meth = RAND_get_rand_method(); | |
| 141 if (meth && meth->cleanup) | |
| 142 meth->cleanup(); | |
| 143 RAND_set_rand_method(NULL); | |
| 144 } | |
| 145 | |
| 146 void RAND_seed(const void *buf, int num) | |
| 147 { | |
| 148 const RAND_METHOD *meth = RAND_get_rand_method(); | |
| 149 if (meth && meth->seed) | |
| 150 meth->seed(buf,num); | |
| 151 } | |
| 152 | |
| 153 void RAND_add(const void *buf, int num, double entropy) | |
| 154 { | |
| 155 const RAND_METHOD *meth = RAND_get_rand_method(); | |
| 156 if (meth && meth->add) | |
| 157 meth->add(buf,num,entropy); | |
| 158 } | |
| 159 | |
| 160 int RAND_bytes(unsigned char *buf, int num) | |
| 161 { | |
| 162 const RAND_METHOD *meth = RAND_get_rand_method(); | |
| 163 if (meth && meth->bytes) | |
| 164 return meth->bytes(buf,num); | |
| 165 return(-1); | |
| 166 } | |
| 167 | |
| 168 int RAND_pseudo_bytes(unsigned char *buf, int num) | |
| 169 { | |
| 170 const RAND_METHOD *meth = RAND_get_rand_method(); | |
| 171 if (meth && meth->pseudorand) | |
| 172 return meth->pseudorand(buf,num); | |
| 173 return(-1); | |
| 174 } | |
| 175 | |
| 176 int RAND_status(void) | |
| 177 { | |
| 178 const RAND_METHOD *meth = RAND_get_rand_method(); | |
| 179 if (meth && meth->status) | |
| 180 return meth->status(); | |
| 181 return 0; | |
| 182 } | |
| 183 | |
| 184 #ifdef OPENSSL_FIPS | |
| 185 | |
| 186 /* FIPS DRBG initialisation code. This sets up the DRBG for use by the | |
| 187 * rest of OpenSSL. | |
| 188 */ | |
| 189 | |
| 190 /* Entropy gatherer: use standard OpenSSL PRNG to seed (this will gather | |
| 191 * entropy internally through RAND_poll(). | |
| 192 */ | |
| 193 | |
| 194 static size_t drbg_get_entropy(DRBG_CTX *ctx, unsigned char **pout, | |
| 195 int entropy, size_t min_len, size_t max_len) | |
| 196 { | |
| 197 /* Round up request to multiple of block size */ | |
| 198 min_len = ((min_len + 19) / 20) * 20; | |
| 199 *pout = OPENSSL_malloc(min_len); | |
| 200 if (!*pout) | |
| 201 return 0; | |
| 202 if (RAND_SSLeay()->bytes(*pout, min_len) <= 0) | |
| 203 { | |
| 204 OPENSSL_free(*pout); | |
| 205 *pout = NULL; | |
| 206 return 0; | |
| 207 } | |
| 208 return min_len; | |
| 209 } | |
| 210 | |
| 211 static void drbg_free_entropy(DRBG_CTX *ctx, unsigned char *out, size_t olen) | |
| 212 { | |
| 213 if (out) | |
| 214 { | |
| 215 OPENSSL_cleanse(out, olen); | |
| 216 OPENSSL_free(out); | |
| 217 } | |
| 218 } | |
| 219 | |
| 220 /* Set "additional input" when generating random data. This uses the | |
| 221 * current PID, a time value and a counter. | |
| 222 */ | |
| 223 | |
| 224 static size_t drbg_get_adin(DRBG_CTX *ctx, unsigned char **pout) | |
| 225 { | |
| 226 /* Use of static variables is OK as this happens under a lock */ | |
| 227 static unsigned char buf[16]; | |
| 228 static unsigned long counter; | |
| 229 FIPS_get_timevec(buf, &counter); | |
| 230 *pout = buf; | |
| 231 return sizeof(buf); | |
| 232 } | |
| 233 | |
| 234 /* RAND_add() and RAND_seed() pass through to OpenSSL PRNG so it is | |
| 235 * correctly seeded by RAND_poll(). | |
| 236 */ | |
| 237 | |
| 238 static int drbg_rand_add(DRBG_CTX *ctx, const void *in, int inlen, | |
| 239 double entropy) | |
| 240 { | |
| 241 RAND_SSLeay()->add(in, inlen, entropy); | |
| 242 return 1; | |
| 243 } | |
| 244 | |
| 245 static int drbg_rand_seed(DRBG_CTX *ctx, const void *in, int inlen) | |
| 246 { | |
| 247 RAND_SSLeay()->seed(in, inlen); | |
| 248 return 1; | |
| 249 } | |
| 250 | |
| 251 #ifndef OPENSSL_DRBG_DEFAULT_TYPE | |
| 252 #define OPENSSL_DRBG_DEFAULT_TYPE NID_aes_256_ctr | |
| 253 #endif | |
| 254 #ifndef OPENSSL_DRBG_DEFAULT_FLAGS | |
| 255 #define OPENSSL_DRBG_DEFAULT_FLAGS DRBG_FLAG_CTR_USE_DF | |
| 256 #endif | |
| 257 | |
| 258 static int fips_drbg_type = OPENSSL_DRBG_DEFAULT_TYPE; | |
| 259 static int fips_drbg_flags = OPENSSL_DRBG_DEFAULT_FLAGS; | |
| 260 | |
| 261 void RAND_set_fips_drbg_type(int type, int flags) | |
| 262 { | |
| 263 fips_drbg_type = type; | |
| 264 fips_drbg_flags = flags; | |
| 265 } | |
| 266 | |
| 267 int RAND_init_fips(void) | |
| 268 { | |
| 269 DRBG_CTX *dctx; | |
| 270 size_t plen; | |
| 271 unsigned char pers[32], *p; | |
| 272 dctx = FIPS_get_default_drbg(); | |
| 273 if (FIPS_drbg_init(dctx, fips_drbg_type, fips_drbg_flags) <= 0) | |
| 274 { | |
| 275 RANDerr(RAND_F_RAND_INIT_FIPS, RAND_R_ERROR_INITIALISING_DRBG); | |
| 276 return 0; | |
| 277 } | |
| 278 | |
| 279 FIPS_drbg_set_callbacks(dctx, | |
| 280 drbg_get_entropy, drbg_free_entropy, 20, | |
| 281 drbg_get_entropy, drbg_free_entropy); | |
| 282 FIPS_drbg_set_rand_callbacks(dctx, drbg_get_adin, 0, | |
| 283 drbg_rand_seed, drbg_rand_add); | |
| 284 /* Personalisation string: a string followed by date time vector */ | |
| 285 strcpy((char *)pers, "OpenSSL DRBG2.0"); | |
| 286 plen = drbg_get_adin(dctx, &p); | |
| 287 memcpy(pers + 16, p, plen); | |
| 288 | |
| 289 if (FIPS_drbg_instantiate(dctx, pers, sizeof(pers)) <= 0) | |
| 290 { | |
| 291 RANDerr(RAND_F_RAND_INIT_FIPS, RAND_R_ERROR_INSTANTIATING_DRBG); | |
| 292 return 0; | |
| 293 } | |
| 294 FIPS_rand_set_method(FIPS_drbg_method()); | |
| 295 return 1; | |
| 296 } | |
| 297 | |
| 298 #endif | |
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Chromium Code Reviews
Issue 2072073002:
Delete bundled copy of OpenSSL and replace with README. (Closed)
Base URL: https://chromium.googlesource.com/chromium/deps/openssl@master