1 /* crypto/rand/rand_lib.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
62 #include <openssl/rand.h>
64 #ifndef OPENSSL_NO_ENGINE
65 #include <openssl/engine.h>
69 #include <openssl/fips.h>
70 #include <openssl/fips_rand.h>
73 #ifndef OPENSSL_NO_ENGINE
74 /* non-NULL if default_RAND_meth is ENGINE-provided */
75 static ENGINE *funct_ref =NULL;
77 static const RAND_METHOD *default_RAND_meth = NULL;
79 int RAND_set_rand_method(const RAND_METHOD *meth)
82 if (!FIPS_rand_set_method(meth))
85 #ifndef OPENSSL_NO_ENGINE
88 ENGINE_finish(funct_ref);
92 default_RAND_meth = meth;
96 const RAND_METHOD *RAND_get_rand_method(void)
98 if (!default_RAND_meth)
100 #ifndef OPENSSL_NO_ENGINE
101 ENGINE *e = ENGINE_get_default_RAND();
104 default_RAND_meth = ENGINE_get_RAND(e);
105 if(!default_RAND_meth)
115 default_RAND_meth = RAND_SSLeay();
117 return default_RAND_meth;
120 #ifndef OPENSSL_NO_ENGINE
121 int RAND_set_rand_engine(ENGINE *engine)
123 const RAND_METHOD *tmp_meth = NULL;
126 if(!ENGINE_init(engine))
128 tmp_meth = ENGINE_get_RAND(engine);
131 ENGINE_finish(engine);
135 /* This function releases any prior ENGINE so call it first */
136 RAND_set_rand_method(tmp_meth);
142 void RAND_cleanup(void)
144 const RAND_METHOD *meth = RAND_get_rand_method();
145 if (meth && meth->cleanup)
147 RAND_set_rand_method(NULL);
150 void RAND_seed(const void *buf, int num)
152 const RAND_METHOD *meth = RAND_get_rand_method();
153 if (meth && meth->seed)
157 void RAND_add(const void *buf, int num, double entropy)
159 const RAND_METHOD *meth = RAND_get_rand_method();
160 if (meth && meth->add)
161 meth->add(buf,num,entropy);
164 int RAND_bytes(unsigned char *buf, int num)
166 const RAND_METHOD *meth = RAND_get_rand_method();
167 if (meth && meth->bytes)
168 return meth->bytes(buf,num);
172 int RAND_pseudo_bytes(unsigned char *buf, int num)
174 const RAND_METHOD *meth = RAND_get_rand_method();
175 if (meth && meth->pseudorand)
176 return meth->pseudorand(buf,num);
180 int RAND_status(void)
182 const RAND_METHOD *meth = RAND_get_rand_method();
183 if (meth && meth->status)
184 return meth->status();
190 /* FIPS DRBG initialisation code. This sets up the DRBG for use by the
194 /* Entropy gatherer: use standard OpenSSL PRNG to seed (this will gather
195 * entropy internally through RAND_poll().
198 static size_t drbg_get_entropy(DRBG_CTX *ctx, unsigned char **pout,
199 int entropy, size_t min_len, size_t max_len)
201 *pout = OPENSSL_malloc(min_len);
204 /* Round up request to multiple of block size */
205 min_len = ((min_len + 19) / 20) * 20;
206 if (RAND_SSLeay()->bytes(*pout, min_len) <= 0)
215 static void drbg_free_entropy(DRBG_CTX *ctx, unsigned char *out, size_t olen)
217 OPENSSL_cleanse(out, olen);
221 /* Set "additional input" when generating random data. This uses the
222 * current PID, a time value and a counter.
225 static size_t drbg_get_adin(DRBG_CTX *ctx, unsigned char **pout)
227 /* Use of static variables is OK as this happens under a lock */
228 static unsigned char buf[16];
229 static unsigned long counter;
230 FIPS_get_timevec(buf, &counter);
235 /* RAND_add() and RAND_seed() pass through to OpenSSL PRNG so it is
236 * correctly seeded by RAND_poll().
239 static int drbg_rand_add(DRBG_CTX *ctx, const void *in, int inlen,
242 return RAND_SSLeay()->add(in, inlen, entropy);
245 static int drbg_rand_seed(DRBG_CTX *ctx, const void *in, int inlen)
247 return RAND_SSLeay()->seed(in, inlen);
250 int RAND_init_fips(void)
254 unsigned char pers[32], *p;
255 dctx = FIPS_get_default_drbg();
256 FIPS_drbg_init(dctx, NID_aes_256_ctr, DRBG_FLAG_CTR_USE_DF);
257 FIPS_drbg_set_callbacks(dctx,
258 drbg_get_entropy, drbg_free_entropy, 20,
259 drbg_get_entropy, drbg_free_entropy);
260 FIPS_drbg_set_rand_callbacks(dctx, drbg_get_adin, 0,
261 drbg_rand_seed, drbg_rand_add);
262 /* Personalisation string: a string followed by date time vector */
263 strcpy((char *)pers, "OpenSSL DRBG2.0");
264 plen = drbg_get_adin(dctx, &p);
265 memcpy(pers + 16, p, plen);
267 FIPS_drbg_instantiate(dctx, pers, sizeof(pers));
268 FIPS_rand_set_method(FIPS_drbg_method());