155714Skris/* crypto/rand/rand_lib.c */ 255714Skris/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 355714Skris * All rights reserved. 455714Skris * 555714Skris * This package is an SSL implementation written 655714Skris * by Eric Young (eay@cryptsoft.com). 755714Skris * The implementation was written so as to conform with Netscapes SSL. 8280297Sjkim * 955714Skris * This library is free for commercial and non-commercial use as long as 1055714Skris * the following conditions are aheared to. The following conditions 1155714Skris * apply to all code found in this distribution, be it the RC4, RSA, 1255714Skris * lhash, DES, etc., code; not just the SSL code. The SSL documentation 1355714Skris * included with this distribution is covered by the same copyright terms 1455714Skris * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15280297Sjkim * 1655714Skris * Copyright remains Eric Young's, and as such any Copyright notices in 1755714Skris * the code are not to be removed. 1855714Skris * If this package is used in a product, Eric Young should be given attribution 1955714Skris * as the author of the parts of the library used. 2055714Skris * This can be in the form of a textual message at program startup or 2155714Skris * in documentation (online or textual) provided with the package. 22280297Sjkim * 2355714Skris * Redistribution and use in source and binary forms, with or without 2455714Skris * modification, are permitted provided that the following conditions 2555714Skris * are met: 2655714Skris * 1. Redistributions of source code must retain the copyright 2755714Skris * notice, this list of conditions and the following disclaimer. 2855714Skris * 2. Redistributions in binary form must reproduce the above copyright 2955714Skris * notice, this list of conditions and the following disclaimer in the 3055714Skris * documentation and/or other materials provided with the distribution. 3155714Skris * 3. All advertising materials mentioning features or use of this software 3255714Skris * must display the following acknowledgement: 3355714Skris * "This product includes cryptographic software written by 3455714Skris * Eric Young (eay@cryptsoft.com)" 3555714Skris * The word 'cryptographic' can be left out if the rouines from the library 3655714Skris * being used are not cryptographic related :-). 37280297Sjkim * 4. If you include any Windows specific code (or a derivative thereof) from 3855714Skris * the apps directory (application code) you must include an acknowledgement: 3955714Skris * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40280297Sjkim * 4155714Skris * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 4255714Skris * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 4355714Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 4455714Skris * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 4555714Skris * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 4655714Skris * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 4755714Skris * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4855714Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 4955714Skris * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 5055714Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 5155714Skris * SUCH DAMAGE. 52280297Sjkim * 5355714Skris * The licence and distribution terms for any publically available version or 5455714Skris * derivative of this code cannot be changed. i.e. this code cannot simply be 5555714Skris * copied and put under another distribution licence 5655714Skris * [including the GNU Public Licence.] 5755714Skris */ 5855714Skris 5955714Skris#include <stdio.h> 6055714Skris#include <time.h> 61109998Smarkm#include "cryptlib.h" 6255714Skris#include <openssl/rand.h> 63194206Ssimon 64111147Snectar#ifndef OPENSSL_NO_ENGINE 65280297Sjkim# include <openssl/engine.h> 66111147Snectar#endif 6755714Skris 68194206Ssimon#ifdef OPENSSL_FIPS 69280297Sjkim# include <openssl/fips.h> 70280297Sjkim# include <openssl/fips_rand.h> 71280297Sjkim# include "rand_lcl.h" 72194206Ssimon#endif 73194206Ssimon 74194206Ssimon#ifndef OPENSSL_NO_ENGINE 75109998Smarkm/* non-NULL if default_RAND_meth is ENGINE-provided */ 76280297Sjkimstatic ENGINE *funct_ref = NULL; 77111147Snectar#endif 78238405Sjkimstatic const RAND_METHOD *default_RAND_meth = NULL; 7955714Skris 80109998Smarkmint RAND_set_rand_method(const RAND_METHOD *meth) 81280297Sjkim{ 82111147Snectar#ifndef OPENSSL_NO_ENGINE 83280297Sjkim if (funct_ref) { 84280297Sjkim ENGINE_finish(funct_ref); 85280297Sjkim funct_ref = NULL; 86280297Sjkim } 87111147Snectar#endif 88280297Sjkim default_RAND_meth = meth; 89280297Sjkim return 1; 90280297Sjkim} 9155714Skris 92109998Smarkmconst RAND_METHOD *RAND_get_rand_method(void) 93280297Sjkim{ 94280297Sjkim if (!default_RAND_meth) { 95111147Snectar#ifndef OPENSSL_NO_ENGINE 96280297Sjkim ENGINE *e = ENGINE_get_default_RAND(); 97280297Sjkim if (e) { 98280297Sjkim default_RAND_meth = ENGINE_get_RAND(e); 99280297Sjkim if (!default_RAND_meth) { 100280297Sjkim ENGINE_finish(e); 101280297Sjkim e = NULL; 102280297Sjkim } 103280297Sjkim } 104280297Sjkim if (e) 105280297Sjkim funct_ref = e; 106280297Sjkim else 107111147Snectar#endif 108280297Sjkim default_RAND_meth = RAND_SSLeay(); 109280297Sjkim } 110280297Sjkim return default_RAND_meth; 111280297Sjkim} 11255714Skris 113111147Snectar#ifndef OPENSSL_NO_ENGINE 114109998Smarkmint RAND_set_rand_engine(ENGINE *engine) 115280297Sjkim{ 116280297Sjkim const RAND_METHOD *tmp_meth = NULL; 117280297Sjkim if (engine) { 118280297Sjkim if (!ENGINE_init(engine)) 119280297Sjkim return 0; 120280297Sjkim tmp_meth = ENGINE_get_RAND(engine); 121280297Sjkim if (!tmp_meth) { 122280297Sjkim ENGINE_finish(engine); 123280297Sjkim return 0; 124280297Sjkim } 125280297Sjkim } 126280297Sjkim /* This function releases any prior ENGINE so call it first */ 127280297Sjkim RAND_set_rand_method(tmp_meth); 128280297Sjkim funct_ref = engine; 129280297Sjkim return 1; 130280297Sjkim} 131111147Snectar#endif 132109998Smarkm 13355714Skrisvoid RAND_cleanup(void) 134280297Sjkim{ 135280297Sjkim const RAND_METHOD *meth = RAND_get_rand_method(); 136280297Sjkim if (meth && meth->cleanup) 137280297Sjkim meth->cleanup(); 138280297Sjkim RAND_set_rand_method(NULL); 139280297Sjkim} 14055714Skris 14155714Skrisvoid RAND_seed(const void *buf, int num) 142280297Sjkim{ 143280297Sjkim const RAND_METHOD *meth = RAND_get_rand_method(); 144280297Sjkim if (meth && meth->seed) 145280297Sjkim meth->seed(buf, num); 146280297Sjkim} 14755714Skris 14859191Skrisvoid RAND_add(const void *buf, int num, double entropy) 149280297Sjkim{ 150280297Sjkim const RAND_METHOD *meth = RAND_get_rand_method(); 151280297Sjkim if (meth && meth->add) 152280297Sjkim meth->add(buf, num, entropy); 153280297Sjkim} 15455714Skris 15559191Skrisint RAND_bytes(unsigned char *buf, int num) 156280297Sjkim{ 157280297Sjkim const RAND_METHOD *meth = RAND_get_rand_method(); 158280297Sjkim if (meth && meth->bytes) 159280297Sjkim return meth->bytes(buf, num); 160280297Sjkim return (-1); 161280297Sjkim} 16259191Skris 16359191Skrisint RAND_pseudo_bytes(unsigned char *buf, int num) 164280297Sjkim{ 165280297Sjkim const RAND_METHOD *meth = RAND_get_rand_method(); 166280297Sjkim if (meth && meth->pseudorand) 167280297Sjkim return meth->pseudorand(buf, num); 168280297Sjkim return (-1); 169280297Sjkim} 17059191Skris 17159191Skrisint RAND_status(void) 172280297Sjkim{ 173280297Sjkim const RAND_METHOD *meth = RAND_get_rand_method(); 174280297Sjkim if (meth && meth->status) 175280297Sjkim return meth->status(); 176280297Sjkim return 0; 177280297Sjkim} 178238405Sjkim 179238405Sjkim#ifdef OPENSSL_FIPS 180238405Sjkim 181280297Sjkim/* 182280297Sjkim * FIPS DRBG initialisation code. This sets up the DRBG for use by the rest 183280297Sjkim * of OpenSSL. 184238405Sjkim */ 185238405Sjkim 186280297Sjkim/* 187280297Sjkim * Entropy gatherer: use standard OpenSSL PRNG to seed (this will gather 188340704Sjkim * entropy internally through RAND_poll()). 189238405Sjkim */ 190238405Sjkim 191238405Sjkimstatic size_t drbg_get_entropy(DRBG_CTX *ctx, unsigned char **pout, 192280297Sjkim int entropy, size_t min_len, size_t max_len) 193280297Sjkim{ 194280297Sjkim /* Round up request to multiple of block size */ 195280297Sjkim min_len = ((min_len + 19) / 20) * 20; 196280297Sjkim *pout = OPENSSL_malloc(min_len); 197280297Sjkim if (!*pout) 198280297Sjkim return 0; 199340704Sjkim 200340704Sjkim /* Enforces a reseed of the SSLEAY PRNG before generating random bytes */ 201340704Sjkim if (ssleay_rand_bytes_from_system(*pout, min_len) <= 0) { 202340704Sjkim OPENSSL_free(*pout); 203340704Sjkim *pout = NULL; 204340704Sjkim return 0; 205340704Sjkim } 206340704Sjkim return min_len; 207340704Sjkim} 208340704Sjkim 209340704Sjkimstatic size_t drbg_get_nonce(DRBG_CTX *ctx, unsigned char **pout, 210340704Sjkim int entropy, size_t min_len, size_t max_len) 211340704Sjkim{ 212340704Sjkim /* Round up request to multiple of block size */ 213340704Sjkim min_len = ((min_len + 19) / 20) * 20; 214340704Sjkim *pout = OPENSSL_malloc(min_len); 215340704Sjkim if (!*pout) 216340704Sjkim return 0; 217280297Sjkim if (ssleay_rand_bytes(*pout, min_len, 0, 0) <= 0) { 218280297Sjkim OPENSSL_free(*pout); 219280297Sjkim *pout = NULL; 220280297Sjkim return 0; 221280297Sjkim } 222280297Sjkim return min_len; 223280297Sjkim} 224238405Sjkim 225238405Sjkimstatic void drbg_free_entropy(DRBG_CTX *ctx, unsigned char *out, size_t olen) 226280297Sjkim{ 227280297Sjkim if (out) { 228280297Sjkim OPENSSL_cleanse(out, olen); 229280297Sjkim OPENSSL_free(out); 230280297Sjkim } 231280297Sjkim} 232238405Sjkim 233280297Sjkim/* 234280297Sjkim * Set "additional input" when generating random data. This uses the current 235280297Sjkim * PID, a time value and a counter. 236238405Sjkim */ 237238405Sjkim 238238405Sjkimstatic size_t drbg_get_adin(DRBG_CTX *ctx, unsigned char **pout) 239280297Sjkim{ 240280297Sjkim /* Use of static variables is OK as this happens under a lock */ 241280297Sjkim static unsigned char buf[16]; 242280297Sjkim static unsigned long counter; 243280297Sjkim FIPS_get_timevec(buf, &counter); 244280297Sjkim *pout = buf; 245280297Sjkim return sizeof(buf); 246280297Sjkim} 247238405Sjkim 248280297Sjkim/* 249280297Sjkim * RAND_add() and RAND_seed() pass through to OpenSSL PRNG so it is 250238405Sjkim * correctly seeded by RAND_poll(). 251238405Sjkim */ 252238405Sjkim 253238405Sjkimstatic int drbg_rand_add(DRBG_CTX *ctx, const void *in, int inlen, 254280297Sjkim double entropy) 255280297Sjkim{ 256280297Sjkim RAND_SSLeay()->add(in, inlen, entropy); 257280297Sjkim return 1; 258280297Sjkim} 259238405Sjkim 260238405Sjkimstatic int drbg_rand_seed(DRBG_CTX *ctx, const void *in, int inlen) 261280297Sjkim{ 262280297Sjkim RAND_SSLeay()->seed(in, inlen); 263280297Sjkim return 1; 264280297Sjkim} 265238405Sjkim 266280297Sjkim# ifndef OPENSSL_DRBG_DEFAULT_TYPE 267280297Sjkim# define OPENSSL_DRBG_DEFAULT_TYPE NID_aes_256_ctr 268280297Sjkim# endif 269280297Sjkim# ifndef OPENSSL_DRBG_DEFAULT_FLAGS 270280297Sjkim# define OPENSSL_DRBG_DEFAULT_FLAGS DRBG_FLAG_CTR_USE_DF 271280297Sjkim# endif 272238405Sjkim 273238405Sjkimstatic int fips_drbg_type = OPENSSL_DRBG_DEFAULT_TYPE; 274238405Sjkimstatic int fips_drbg_flags = OPENSSL_DRBG_DEFAULT_FLAGS; 275238405Sjkim 276238405Sjkimvoid RAND_set_fips_drbg_type(int type, int flags) 277280297Sjkim{ 278280297Sjkim fips_drbg_type = type; 279280297Sjkim fips_drbg_flags = flags; 280280297Sjkim} 281238405Sjkim 282238405Sjkimint RAND_init_fips(void) 283280297Sjkim{ 284280297Sjkim DRBG_CTX *dctx; 285280297Sjkim size_t plen; 286280297Sjkim unsigned char pers[32], *p; 287280297Sjkim# ifndef OPENSSL_ALLOW_DUAL_EC_DRBG 288280297Sjkim if (fips_drbg_type >> 16) { 289280297Sjkim RANDerr(RAND_F_RAND_INIT_FIPS, RAND_R_DUAL_EC_DRBG_DISABLED); 290280297Sjkim return 0; 291280297Sjkim } 292280297Sjkim# endif 293238405Sjkim 294280297Sjkim dctx = FIPS_get_default_drbg(); 295280297Sjkim if (FIPS_drbg_init(dctx, fips_drbg_type, fips_drbg_flags) <= 0) { 296280297Sjkim RANDerr(RAND_F_RAND_INIT_FIPS, RAND_R_ERROR_INITIALISING_DRBG); 297280297Sjkim return 0; 298280297Sjkim } 299238405Sjkim 300280297Sjkim FIPS_drbg_set_callbacks(dctx, 301280297Sjkim drbg_get_entropy, drbg_free_entropy, 20, 302340704Sjkim drbg_get_nonce, drbg_free_entropy); 303280297Sjkim FIPS_drbg_set_rand_callbacks(dctx, drbg_get_adin, 0, 304280297Sjkim drbg_rand_seed, drbg_rand_add); 305280297Sjkim /* Personalisation string: a string followed by date time vector */ 306280297Sjkim strcpy((char *)pers, "OpenSSL DRBG2.0"); 307280297Sjkim plen = drbg_get_adin(dctx, &p); 308280297Sjkim memcpy(pers + 16, p, plen); 309280297Sjkim 310280297Sjkim if (FIPS_drbg_instantiate(dctx, pers, sizeof(pers)) <= 0) { 311280297Sjkim RANDerr(RAND_F_RAND_INIT_FIPS, RAND_R_ERROR_INSTANTIATING_DRBG); 312280297Sjkim return 0; 313280297Sjkim } 314280297Sjkim FIPS_rand_set_method(FIPS_drbg_method()); 315280297Sjkim return 1; 316280297Sjkim} 317280297Sjkim 318238405Sjkim#endif 319