Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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> |
Alexandre Lision | f26d3e5 | 2014-04-14 16:22:31 -0400 | [diff] [blame^] | 63 | |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 64 | #ifndef OPENSSL_NO_ENGINE |
| 65 | #include <openssl/engine.h> |
| 66 | #endif |
| 67 | |
Alexandre Lision | f26d3e5 | 2014-04-14 16:22:31 -0400 | [diff] [blame^] | 68 | #ifdef OPENSSL_FIPS |
| 69 | #include <openssl/fips.h> |
| 70 | #include <openssl/fips_rand.h> |
| 71 | #endif |
| 72 | |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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 | } |
Alexandre Lision | f26d3e5 | 2014-04-14 16:22:31 -0400 | [diff] [blame^] | 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 | #ifndef OPENSSL_ALLOW_DUAL_EC_DRBG |
| 273 | if (fips_drbg_type >> 16) |
| 274 | { |
| 275 | RANDerr(RAND_F_RAND_INIT_FIPS, RAND_R_DUAL_EC_DRBG_DISABLED); |
| 276 | return 0; |
| 277 | } |
| 278 | #endif |
| 279 | |
| 280 | dctx = FIPS_get_default_drbg(); |
| 281 | if (FIPS_drbg_init(dctx, fips_drbg_type, fips_drbg_flags) <= 0) |
| 282 | { |
| 283 | RANDerr(RAND_F_RAND_INIT_FIPS, RAND_R_ERROR_INITIALISING_DRBG); |
| 284 | return 0; |
| 285 | } |
| 286 | |
| 287 | FIPS_drbg_set_callbacks(dctx, |
| 288 | drbg_get_entropy, drbg_free_entropy, 20, |
| 289 | drbg_get_entropy, drbg_free_entropy); |
| 290 | FIPS_drbg_set_rand_callbacks(dctx, drbg_get_adin, 0, |
| 291 | drbg_rand_seed, drbg_rand_add); |
| 292 | /* Personalisation string: a string followed by date time vector */ |
| 293 | strcpy((char *)pers, "OpenSSL DRBG2.0"); |
| 294 | plen = drbg_get_adin(dctx, &p); |
| 295 | memcpy(pers + 16, p, plen); |
| 296 | |
| 297 | if (FIPS_drbg_instantiate(dctx, pers, sizeof(pers)) <= 0) |
| 298 | { |
| 299 | RANDerr(RAND_F_RAND_INIT_FIPS, RAND_R_ERROR_INSTANTIATING_DRBG); |
| 300 | return 0; |
| 301 | } |
| 302 | FIPS_rand_set_method(FIPS_drbg_method()); |
| 303 | return 1; |
| 304 | } |
| 305 | |
| 306 | #endif |