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. 855714Skris * 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). 1555714Skris * 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. 2255714Skris * 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 :-). 3755714Skris * 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)" 4055714Skris * 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. 5255714Skris * 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 65109998Smarkm#include <openssl/engine.h> 66111147Snectar#endif 6755714Skris 68194206Ssimon#ifdef OPENSSL_FIPS 69238405Sjkim#include <openssl/fips.h> 70238405Sjkim#include <openssl/fips_rand.h> 71279264Sdelphij#include "rand_lcl.h" 72194206Ssimon#endif 73194206Ssimon 74194206Ssimon#ifndef OPENSSL_NO_ENGINE 75109998Smarkm/* non-NULL if default_RAND_meth is ENGINE-provided */ 76109998Smarkmstatic ENGINE *funct_ref =NULL; 77111147Snectar#endif 78238405Sjkimstatic const RAND_METHOD *default_RAND_meth = NULL; 7955714Skris 80109998Smarkmint RAND_set_rand_method(const RAND_METHOD *meth) 8155714Skris { 82111147Snectar#ifndef OPENSSL_NO_ENGINE 83109998Smarkm if(funct_ref) 84109998Smarkm { 85109998Smarkm ENGINE_finish(funct_ref); 86109998Smarkm funct_ref = NULL; 87109998Smarkm } 88111147Snectar#endif 89109998Smarkm default_RAND_meth = meth; 90109998Smarkm return 1; 9155714Skris } 9255714Skris 93109998Smarkmconst RAND_METHOD *RAND_get_rand_method(void) 9455714Skris { 95109998Smarkm if (!default_RAND_meth) 96109998Smarkm { 97111147Snectar#ifndef OPENSSL_NO_ENGINE 98109998Smarkm ENGINE *e = ENGINE_get_default_RAND(); 99109998Smarkm if(e) 100109998Smarkm { 101109998Smarkm default_RAND_meth = ENGINE_get_RAND(e); 102109998Smarkm if(!default_RAND_meth) 103109998Smarkm { 104109998Smarkm ENGINE_finish(e); 105109998Smarkm e = NULL; 106109998Smarkm } 107109998Smarkm } 108109998Smarkm if(e) 109109998Smarkm funct_ref = e; 110109998Smarkm else 111111147Snectar#endif 112109998Smarkm default_RAND_meth = RAND_SSLeay(); 113109998Smarkm } 114109998Smarkm return default_RAND_meth; 11555714Skris } 11655714Skris 117111147Snectar#ifndef OPENSSL_NO_ENGINE 118109998Smarkmint RAND_set_rand_engine(ENGINE *engine) 119109998Smarkm { 120109998Smarkm const RAND_METHOD *tmp_meth = NULL; 121109998Smarkm if(engine) 122109998Smarkm { 123109998Smarkm if(!ENGINE_init(engine)) 124109998Smarkm return 0; 125109998Smarkm tmp_meth = ENGINE_get_RAND(engine); 126109998Smarkm if(!tmp_meth) 127109998Smarkm { 128109998Smarkm ENGINE_finish(engine); 129109998Smarkm return 0; 130109998Smarkm } 131109998Smarkm } 132109998Smarkm /* This function releases any prior ENGINE so call it first */ 133109998Smarkm RAND_set_rand_method(tmp_meth); 134109998Smarkm funct_ref = engine; 135109998Smarkm return 1; 136109998Smarkm } 137111147Snectar#endif 138109998Smarkm 13955714Skrisvoid RAND_cleanup(void) 14055714Skris { 141109998Smarkm const RAND_METHOD *meth = RAND_get_rand_method(); 142109998Smarkm if (meth && meth->cleanup) 143109998Smarkm meth->cleanup(); 144109998Smarkm RAND_set_rand_method(NULL); 14555714Skris } 14655714Skris 14755714Skrisvoid RAND_seed(const void *buf, int num) 14855714Skris { 149109998Smarkm const RAND_METHOD *meth = RAND_get_rand_method(); 150109998Smarkm if (meth && meth->seed) 151109998Smarkm meth->seed(buf,num); 15255714Skris } 15355714Skris 15459191Skrisvoid RAND_add(const void *buf, int num, double entropy) 15555714Skris { 156109998Smarkm const RAND_METHOD *meth = RAND_get_rand_method(); 157109998Smarkm if (meth && meth->add) 158109998Smarkm meth->add(buf,num,entropy); 15955714Skris } 16055714Skris 16159191Skrisint RAND_bytes(unsigned char *buf, int num) 16259191Skris { 163109998Smarkm const RAND_METHOD *meth = RAND_get_rand_method(); 164109998Smarkm if (meth && meth->bytes) 165109998Smarkm return meth->bytes(buf,num); 16659191Skris return(-1); 16759191Skris } 16859191Skris 16959191Skrisint RAND_pseudo_bytes(unsigned char *buf, int num) 17059191Skris { 171109998Smarkm const RAND_METHOD *meth = RAND_get_rand_method(); 172109998Smarkm if (meth && meth->pseudorand) 173109998Smarkm return meth->pseudorand(buf,num); 17459191Skris return(-1); 17559191Skris } 17659191Skris 17759191Skrisint RAND_status(void) 17859191Skris { 179109998Smarkm const RAND_METHOD *meth = RAND_get_rand_method(); 180109998Smarkm if (meth && meth->status) 181109998Smarkm return meth->status(); 18259191Skris return 0; 18359191Skris } 184238405Sjkim 185238405Sjkim#ifdef OPENSSL_FIPS 186238405Sjkim 187238405Sjkim/* FIPS DRBG initialisation code. This sets up the DRBG for use by the 188238405Sjkim * rest of OpenSSL. 189238405Sjkim */ 190238405Sjkim 191238405Sjkim/* Entropy gatherer: use standard OpenSSL PRNG to seed (this will gather 192238405Sjkim * entropy internally through RAND_poll(). 193238405Sjkim */ 194238405Sjkim 195238405Sjkimstatic size_t drbg_get_entropy(DRBG_CTX *ctx, unsigned char **pout, 196238405Sjkim int entropy, size_t min_len, size_t max_len) 197238405Sjkim { 198238405Sjkim /* Round up request to multiple of block size */ 199238405Sjkim min_len = ((min_len + 19) / 20) * 20; 200238405Sjkim *pout = OPENSSL_malloc(min_len); 201238405Sjkim if (!*pout) 202238405Sjkim return 0; 203279264Sdelphij if (ssleay_rand_bytes(*pout, min_len, 0, 0) <= 0) 204238405Sjkim { 205238405Sjkim OPENSSL_free(*pout); 206238405Sjkim *pout = NULL; 207238405Sjkim return 0; 208238405Sjkim } 209238405Sjkim return min_len; 210238405Sjkim } 211238405Sjkim 212238405Sjkimstatic void drbg_free_entropy(DRBG_CTX *ctx, unsigned char *out, size_t olen) 213238405Sjkim { 214246772Sjkim if (out) 215246772Sjkim { 216246772Sjkim OPENSSL_cleanse(out, olen); 217246772Sjkim OPENSSL_free(out); 218246772Sjkim } 219238405Sjkim } 220238405Sjkim 221238405Sjkim/* Set "additional input" when generating random data. This uses the 222238405Sjkim * current PID, a time value and a counter. 223238405Sjkim */ 224238405Sjkim 225238405Sjkimstatic size_t drbg_get_adin(DRBG_CTX *ctx, unsigned char **pout) 226238405Sjkim { 227238405Sjkim /* Use of static variables is OK as this happens under a lock */ 228238405Sjkim static unsigned char buf[16]; 229238405Sjkim static unsigned long counter; 230238405Sjkim FIPS_get_timevec(buf, &counter); 231238405Sjkim *pout = buf; 232238405Sjkim return sizeof(buf); 233238405Sjkim } 234238405Sjkim 235238405Sjkim/* RAND_add() and RAND_seed() pass through to OpenSSL PRNG so it is 236238405Sjkim * correctly seeded by RAND_poll(). 237238405Sjkim */ 238238405Sjkim 239238405Sjkimstatic int drbg_rand_add(DRBG_CTX *ctx, const void *in, int inlen, 240238405Sjkim double entropy) 241238405Sjkim { 242238405Sjkim RAND_SSLeay()->add(in, inlen, entropy); 243238405Sjkim return 1; 244238405Sjkim } 245238405Sjkim 246238405Sjkimstatic int drbg_rand_seed(DRBG_CTX *ctx, const void *in, int inlen) 247238405Sjkim { 248238405Sjkim RAND_SSLeay()->seed(in, inlen); 249238405Sjkim return 1; 250238405Sjkim } 251238405Sjkim 252238405Sjkim#ifndef OPENSSL_DRBG_DEFAULT_TYPE 253238405Sjkim#define OPENSSL_DRBG_DEFAULT_TYPE NID_aes_256_ctr 254238405Sjkim#endif 255238405Sjkim#ifndef OPENSSL_DRBG_DEFAULT_FLAGS 256238405Sjkim#define OPENSSL_DRBG_DEFAULT_FLAGS DRBG_FLAG_CTR_USE_DF 257238405Sjkim#endif 258238405Sjkim 259238405Sjkimstatic int fips_drbg_type = OPENSSL_DRBG_DEFAULT_TYPE; 260238405Sjkimstatic int fips_drbg_flags = OPENSSL_DRBG_DEFAULT_FLAGS; 261238405Sjkim 262238405Sjkimvoid RAND_set_fips_drbg_type(int type, int flags) 263238405Sjkim { 264238405Sjkim fips_drbg_type = type; 265238405Sjkim fips_drbg_flags = flags; 266238405Sjkim } 267238405Sjkim 268238405Sjkimint RAND_init_fips(void) 269238405Sjkim { 270238405Sjkim DRBG_CTX *dctx; 271238405Sjkim size_t plen; 272238405Sjkim unsigned char pers[32], *p; 273279264Sdelphij#ifndef OPENSSL_ALLOW_DUAL_EC_DRBG 274279264Sdelphij if (fips_drbg_type >> 16) 275279264Sdelphij { 276279264Sdelphij RANDerr(RAND_F_RAND_INIT_FIPS, RAND_R_DUAL_EC_DRBG_DISABLED); 277279264Sdelphij return 0; 278279264Sdelphij } 279279264Sdelphij#endif 280279264Sdelphij 281238405Sjkim dctx = FIPS_get_default_drbg(); 282238405Sjkim if (FIPS_drbg_init(dctx, fips_drbg_type, fips_drbg_flags) <= 0) 283238405Sjkim { 284238405Sjkim RANDerr(RAND_F_RAND_INIT_FIPS, RAND_R_ERROR_INITIALISING_DRBG); 285238405Sjkim return 0; 286238405Sjkim } 287238405Sjkim 288238405Sjkim FIPS_drbg_set_callbacks(dctx, 289238405Sjkim drbg_get_entropy, drbg_free_entropy, 20, 290238405Sjkim drbg_get_entropy, drbg_free_entropy); 291238405Sjkim FIPS_drbg_set_rand_callbacks(dctx, drbg_get_adin, 0, 292238405Sjkim drbg_rand_seed, drbg_rand_add); 293238405Sjkim /* Personalisation string: a string followed by date time vector */ 294238405Sjkim strcpy((char *)pers, "OpenSSL DRBG2.0"); 295238405Sjkim plen = drbg_get_adin(dctx, &p); 296238405Sjkim memcpy(pers + 16, p, plen); 297238405Sjkim 298238405Sjkim if (FIPS_drbg_instantiate(dctx, pers, sizeof(pers)) <= 0) 299238405Sjkim { 300238405Sjkim RANDerr(RAND_F_RAND_INIT_FIPS, RAND_R_ERROR_INSTANTIATING_DRBG); 301238405Sjkim return 0; 302238405Sjkim } 303238405Sjkim FIPS_rand_set_method(FIPS_drbg_method()); 304238405Sjkim return 1; 305238405Sjkim } 306238405Sjkim 307238405Sjkim#endif 308