]>
git.ipfire.org Git - thirdparty/openssl.git/blob - crypto/rand/rand_lib.c
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.]
61 #include "internal/cryptlib.h"
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
)
81 #ifndef OPENSSL_NO_ENGINE
83 ENGINE_finish(funct_ref
);
87 default_RAND_meth
= meth
;
91 const RAND_METHOD
*RAND_get_rand_method(void)
93 if (!default_RAND_meth
) {
94 #ifndef OPENSSL_NO_ENGINE
95 ENGINE
*e
= ENGINE_get_default_RAND();
97 default_RAND_meth
= ENGINE_get_RAND(e
);
98 if (!default_RAND_meth
) {
107 default_RAND_meth
= RAND_OpenSSL();
109 return default_RAND_meth
;
112 #ifndef OPENSSL_NO_ENGINE
113 int RAND_set_rand_engine(ENGINE
*engine
)
115 const RAND_METHOD
*tmp_meth
= NULL
;
117 if (!ENGINE_init(engine
))
119 tmp_meth
= ENGINE_get_RAND(engine
);
121 ENGINE_finish(engine
);
125 /* This function releases any prior ENGINE so call it first */
126 RAND_set_rand_method(tmp_meth
);
132 void RAND_cleanup(void)
134 const RAND_METHOD
*meth
= RAND_get_rand_method();
135 if (meth
&& meth
->cleanup
)
137 RAND_set_rand_method(NULL
);
140 void RAND_seed(const void *buf
, int num
)
142 const RAND_METHOD
*meth
= RAND_get_rand_method();
143 if (meth
&& meth
->seed
)
144 meth
->seed(buf
, num
);
147 void RAND_add(const void *buf
, int num
, double entropy
)
149 const RAND_METHOD
*meth
= RAND_get_rand_method();
150 if (meth
&& meth
->add
)
151 meth
->add(buf
, num
, entropy
);
154 int RAND_bytes(unsigned char *buf
, int num
)
156 const RAND_METHOD
*meth
= RAND_get_rand_method();
157 if (meth
&& meth
->bytes
)
158 return meth
->bytes(buf
, num
);
162 #ifndef OPENSSL_NO_DEPRECATED
163 int RAND_pseudo_bytes(unsigned char *buf
, int num
)
165 const RAND_METHOD
*meth
= RAND_get_rand_method();
166 if (meth
&& meth
->pseudorand
)
167 return meth
->pseudorand(buf
, num
);
172 int RAND_status(void)
174 const RAND_METHOD
*meth
= RAND_get_rand_method();
175 if (meth
&& meth
->status
)
176 return meth
->status();
183 * FIPS DRBG initialisation code. This sets up the DRBG for use by the rest
188 * Entropy gatherer: use standard OpenSSL PRNG to seed (this will gather
189 * entropy internally through RAND_poll().
192 static size_t drbg_get_entropy(DRBG_CTX
*ctx
, unsigned char **pout
,
193 int entropy
, size_t min_len
, size_t max_len
)
195 /* Round up request to multiple of block size */
196 min_len
= ((min_len
+ 19) / 20) * 20;
197 *pout
= OPENSSL_malloc(min_len
);
200 if (RAND_OpenSSL()->bytes(*pout
, min_len
) <= 0) {
208 static void drbg_free_entropy(DRBG_CTX
*ctx
, unsigned char *out
, size_t olen
)
210 OPENSSL_clear_free(out
, olen
);
214 * Set "additional input" when generating random data. This uses the current
215 * PID, a time value and a counter.
218 static size_t drbg_get_adin(DRBG_CTX
*ctx
, unsigned char **pout
)
220 /* Use of static variables is OK as this happens under a lock */
221 static unsigned char buf
[16];
222 static unsigned long counter
;
223 FIPS_get_timevec(buf
, &counter
);
224 rand_hw_xor(buf
, sizeof(buf
));
230 * RAND_add() and RAND_seed() pass through to OpenSSL PRNG so it is
231 * correctly seeded by RAND_poll().
234 static int drbg_rand_add(DRBG_CTX
*ctx
, const void *in
, int inlen
,
237 return RAND_OpenSSL()->add(in
, inlen
, entropy
);
240 static int drbg_rand_seed(DRBG_CTX
*ctx
, const void *in
, int inlen
)
242 return RAND_OpenSSL()->seed(in
, inlen
);
245 int RAND_init_fips(void)
249 unsigned char pers
[32], *p
;
250 dctx
= FIPS_get_default_drbg();
251 FIPS_drbg_init(dctx
, NID_aes_256_ctr
, DRBG_FLAG_CTR_USE_DF
);
252 FIPS_drbg_set_callbacks(dctx
,
253 drbg_get_entropy
, drbg_free_entropy
, 20,
254 drbg_get_entropy
, drbg_free_entropy
);
255 FIPS_drbg_set_rand_callbacks(dctx
, drbg_get_adin
, 0,
256 drbg_rand_seed
, drbg_rand_add
);
257 /* Personalisation string: a string followed by date time vector */
258 strcpy((char *)pers
, "OpenSSL DRBG2.0");
259 plen
= drbg_get_adin(dctx
, &p
);
260 memcpy(pers
+ 16, p
, plen
);
262 FIPS_drbg_instantiate(dctx
, pers
, sizeof(pers
));
263 FIPS_rand_set_method(FIPS_drbg_method());