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. 8280304Sjkim * 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). 15280304Sjkim * 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. 22280304Sjkim * 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 :-). 37280304Sjkim * 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)" 40280304Sjkim * 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. 52280304Sjkim * 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 65280304Sjkim# include <openssl/engine.h> 66111147Snectar#endif 6755714Skris 68194206Ssimon#ifdef OPENSSL_FIPS 69280304Sjkim# include <openssl/fips.h> 70280304Sjkim# include <openssl/fips_rand.h> 71280304Sjkim# include "rand_lcl.h" 72194206Ssimon#endif 73194206Ssimon 74194206Ssimon#ifndef OPENSSL_NO_ENGINE 75109998Smarkm/* non-NULL if default_RAND_meth is ENGINE-provided */ 76280304Sjkimstatic ENGINE *funct_ref = NULL; 77111147Snectar#endif 78238405Sjkimstatic const RAND_METHOD *default_RAND_meth = NULL; 7955714Skris 80109998Smarkmint RAND_set_rand_method(const RAND_METHOD *meth) 81280304Sjkim{ 82111147Snectar#ifndef OPENSSL_NO_ENGINE 83280304Sjkim if (funct_ref) { 84280304Sjkim ENGINE_finish(funct_ref); 85280304Sjkim funct_ref = NULL; 86280304Sjkim } 87111147Snectar#endif 88280304Sjkim default_RAND_meth = meth; 89280304Sjkim return 1; 90280304Sjkim} 9155714Skris 92109998Smarkmconst RAND_METHOD *RAND_get_rand_method(void) 93280304Sjkim{ 94280304Sjkim if (!default_RAND_meth) { 95111147Snectar#ifndef OPENSSL_NO_ENGINE 96280304Sjkim ENGINE *e = ENGINE_get_default_RAND(); 97280304Sjkim if (e) { 98280304Sjkim default_RAND_meth = ENGINE_get_RAND(e); 99280304Sjkim if (!default_RAND_meth) { 100280304Sjkim ENGINE_finish(e); 101280304Sjkim e = NULL; 102280304Sjkim } 103280304Sjkim } 104280304Sjkim if (e) 105280304Sjkim funct_ref = e; 106280304Sjkim else 107111147Snectar#endif 108280304Sjkim default_RAND_meth = RAND_SSLeay(); 109280304Sjkim } 110280304Sjkim return default_RAND_meth; 111280304Sjkim} 11255714Skris 113111147Snectar#ifndef OPENSSL_NO_ENGINE 114109998Smarkmint RAND_set_rand_engine(ENGINE *engine) 115280304Sjkim{ 116280304Sjkim const RAND_METHOD *tmp_meth = NULL; 117280304Sjkim if (engine) { 118280304Sjkim if (!ENGINE_init(engine)) 119280304Sjkim return 0; 120280304Sjkim tmp_meth = ENGINE_get_RAND(engine); 121280304Sjkim if (!tmp_meth) { 122280304Sjkim ENGINE_finish(engine); 123280304Sjkim return 0; 124280304Sjkim } 125280304Sjkim } 126280304Sjkim /* This function releases any prior ENGINE so call it first */ 127280304Sjkim RAND_set_rand_method(tmp_meth); 128280304Sjkim funct_ref = engine; 129280304Sjkim return 1; 130280304Sjkim} 131111147Snectar#endif 132109998Smarkm 13355714Skrisvoid RAND_cleanup(void) 134280304Sjkim{ 135280304Sjkim const RAND_METHOD *meth = RAND_get_rand_method(); 136280304Sjkim if (meth && meth->cleanup) 137280304Sjkim meth->cleanup(); 138280304Sjkim RAND_set_rand_method(NULL); 139280304Sjkim} 14055714Skris 14155714Skrisvoid RAND_seed(const void *buf, int num) 142280304Sjkim{ 143280304Sjkim const RAND_METHOD *meth = RAND_get_rand_method(); 144280304Sjkim if (meth && meth->seed) 145280304Sjkim meth->seed(buf, num); 146280304Sjkim} 14755714Skris 14859191Skrisvoid RAND_add(const void *buf, int num, double entropy) 149280304Sjkim{ 150280304Sjkim const RAND_METHOD *meth = RAND_get_rand_method(); 151280304Sjkim if (meth && meth->add) 152280304Sjkim meth->add(buf, num, entropy); 153280304Sjkim} 15455714Skris 15559191Skrisint RAND_bytes(unsigned char *buf, int num) 156280304Sjkim{ 157280304Sjkim const RAND_METHOD *meth = RAND_get_rand_method(); 158280304Sjkim if (meth && meth->bytes) 159280304Sjkim return meth->bytes(buf, num); 160280304Sjkim return (-1); 161280304Sjkim} 16259191Skris 16359191Skrisint RAND_pseudo_bytes(unsigned char *buf, int num) 164280304Sjkim{ 165280304Sjkim const RAND_METHOD *meth = RAND_get_rand_method(); 166280304Sjkim if (meth && meth->pseudorand) 167280304Sjkim return meth->pseudorand(buf, num); 168280304Sjkim return (-1); 169280304Sjkim} 17059191Skris 17159191Skrisint RAND_status(void) 172280304Sjkim{ 173280304Sjkim const RAND_METHOD *meth = RAND_get_rand_method(); 174280304Sjkim if (meth && meth->status) 175280304Sjkim return meth->status(); 176280304Sjkim return 0; 177280304Sjkim} 178238405Sjkim 179238405Sjkim#ifdef OPENSSL_FIPS 180238405Sjkim 181280304Sjkim/* 182280304Sjkim * FIPS DRBG initialisation code. This sets up the DRBG for use by the rest 183280304Sjkim * of OpenSSL. 184238405Sjkim */ 185238405Sjkim 186280304Sjkim/* 187280304Sjkim * Entropy gatherer: use standard OpenSSL PRNG to seed (this will gather 188238405Sjkim * entropy internally through RAND_poll(). 189238405Sjkim */ 190238405Sjkim 191238405Sjkimstatic size_t drbg_get_entropy(DRBG_CTX *ctx, unsigned char **pout, 192280304Sjkim int entropy, size_t min_len, size_t max_len) 193280304Sjkim{ 194280304Sjkim /* Round up request to multiple of block size */ 195280304Sjkim min_len = ((min_len + 19) / 20) * 20; 196280304Sjkim *pout = OPENSSL_malloc(min_len); 197280304Sjkim if (!*pout) 198280304Sjkim return 0; 199280304Sjkim if (ssleay_rand_bytes(*pout, min_len, 0, 0) <= 0) { 200280304Sjkim OPENSSL_free(*pout); 201280304Sjkim *pout = NULL; 202280304Sjkim return 0; 203280304Sjkim } 204280304Sjkim return min_len; 205280304Sjkim} 206238405Sjkim 207238405Sjkimstatic void drbg_free_entropy(DRBG_CTX *ctx, unsigned char *out, size_t olen) 208280304Sjkim{ 209280304Sjkim if (out) { 210280304Sjkim OPENSSL_cleanse(out, olen); 211280304Sjkim OPENSSL_free(out); 212280304Sjkim } 213280304Sjkim} 214238405Sjkim 215280304Sjkim/* 216280304Sjkim * Set "additional input" when generating random data. This uses the current 217280304Sjkim * PID, a time value and a counter. 218238405Sjkim */ 219238405Sjkim 220238405Sjkimstatic size_t drbg_get_adin(DRBG_CTX *ctx, unsigned char **pout) 221280304Sjkim{ 222280304Sjkim /* Use of static variables is OK as this happens under a lock */ 223280304Sjkim static unsigned char buf[16]; 224280304Sjkim static unsigned long counter; 225280304Sjkim FIPS_get_timevec(buf, &counter); 226280304Sjkim *pout = buf; 227280304Sjkim return sizeof(buf); 228280304Sjkim} 229238405Sjkim 230280304Sjkim/* 231280304Sjkim * RAND_add() and RAND_seed() pass through to OpenSSL PRNG so it is 232238405Sjkim * correctly seeded by RAND_poll(). 233238405Sjkim */ 234238405Sjkim 235238405Sjkimstatic int drbg_rand_add(DRBG_CTX *ctx, const void *in, int inlen, 236280304Sjkim double entropy) 237280304Sjkim{ 238280304Sjkim RAND_SSLeay()->add(in, inlen, entropy); 239280304Sjkim return 1; 240280304Sjkim} 241238405Sjkim 242238405Sjkimstatic int drbg_rand_seed(DRBG_CTX *ctx, const void *in, int inlen) 243280304Sjkim{ 244280304Sjkim RAND_SSLeay()->seed(in, inlen); 245280304Sjkim return 1; 246280304Sjkim} 247238405Sjkim 248280304Sjkim# ifndef OPENSSL_DRBG_DEFAULT_TYPE 249280304Sjkim# define OPENSSL_DRBG_DEFAULT_TYPE NID_aes_256_ctr 250280304Sjkim# endif 251280304Sjkim# ifndef OPENSSL_DRBG_DEFAULT_FLAGS 252280304Sjkim# define OPENSSL_DRBG_DEFAULT_FLAGS DRBG_FLAG_CTR_USE_DF 253280304Sjkim# endif 254238405Sjkim 255238405Sjkimstatic int fips_drbg_type = OPENSSL_DRBG_DEFAULT_TYPE; 256238405Sjkimstatic int fips_drbg_flags = OPENSSL_DRBG_DEFAULT_FLAGS; 257238405Sjkim 258238405Sjkimvoid RAND_set_fips_drbg_type(int type, int flags) 259280304Sjkim{ 260280304Sjkim fips_drbg_type = type; 261280304Sjkim fips_drbg_flags = flags; 262280304Sjkim} 263238405Sjkim 264238405Sjkimint RAND_init_fips(void) 265280304Sjkim{ 266280304Sjkim DRBG_CTX *dctx; 267280304Sjkim size_t plen; 268280304Sjkim unsigned char pers[32], *p; 269280304Sjkim# ifndef OPENSSL_ALLOW_DUAL_EC_DRBG 270280304Sjkim if (fips_drbg_type >> 16) { 271280304Sjkim RANDerr(RAND_F_RAND_INIT_FIPS, RAND_R_DUAL_EC_DRBG_DISABLED); 272280304Sjkim return 0; 273280304Sjkim } 274280304Sjkim# endif 275238405Sjkim 276280304Sjkim dctx = FIPS_get_default_drbg(); 277280304Sjkim if (FIPS_drbg_init(dctx, fips_drbg_type, fips_drbg_flags) <= 0) { 278280304Sjkim RANDerr(RAND_F_RAND_INIT_FIPS, RAND_R_ERROR_INITIALISING_DRBG); 279280304Sjkim return 0; 280280304Sjkim } 281238405Sjkim 282280304Sjkim FIPS_drbg_set_callbacks(dctx, 283280304Sjkim drbg_get_entropy, drbg_free_entropy, 20, 284280304Sjkim drbg_get_entropy, drbg_free_entropy); 285280304Sjkim FIPS_drbg_set_rand_callbacks(dctx, drbg_get_adin, 0, 286280304Sjkim drbg_rand_seed, drbg_rand_add); 287280304Sjkim /* Personalisation string: a string followed by date time vector */ 288280304Sjkim strcpy((char *)pers, "OpenSSL DRBG2.0"); 289280304Sjkim plen = drbg_get_adin(dctx, &p); 290280304Sjkim memcpy(pers + 16, p, plen); 291280304Sjkim 292280304Sjkim if (FIPS_drbg_instantiate(dctx, pers, sizeof(pers)) <= 0) { 293280304Sjkim RANDerr(RAND_F_RAND_INIT_FIPS, RAND_R_ERROR_INSTANTIATING_DRBG); 294280304Sjkim return 0; 295280304Sjkim } 296280304Sjkim FIPS_rand_set_method(FIPS_drbg_method()); 297280304Sjkim return 1; 298280304Sjkim} 299280304Sjkim 300238405Sjkim#endif 301