rand_lib.c revision 194206 
1/* crypto/rand/rand_lib.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
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.
8 *
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).
15 *
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.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
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)"
40 *
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
51 * SUCH DAMAGE.
52 *
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.]
57 */
58
59#include <stdio.h>
60#include <time.h>
61#include "cryptlib.h"
62#include <openssl/rand.h>
63#include "rand_lcl.h"
64#ifdef OPENSSL_FIPS
65#include <openssl/fips.h>
66#include <openssl/fips_rand.h>
67#endif
68
69#ifndef OPENSSL_NO_ENGINE
70#include <openssl/engine.h>
71#endif
72
73static const RAND_METHOD *default_RAND_meth = NULL;
74
75#ifdef OPENSSL_FIPS
76
77static int fips_RAND_set_rand_method(const RAND_METHOD *meth,
78					const RAND_METHOD **pmeth)
79	{
80	*pmeth = meth;
81	return 1;
82	}
83
84static const RAND_METHOD *fips_RAND_get_rand_method(const RAND_METHOD **pmeth)
85	{
86	if (!*pmeth)
87		{
88		if(FIPS_mode())
89			*pmeth=FIPS_rand_method();
90		else
91			*pmeth = RAND_SSLeay();
92		}
93
94	if(FIPS_mode()
95		&& *pmeth != FIPS_rand_check())
96	    {
97	    RANDerr(RAND_F_FIPS_RAND_GET_RAND_METHOD,RAND_R_NON_FIPS_METHOD);
98	    return 0;
99	    }
100
101	return *pmeth;
102	}
103
104static int (*RAND_set_rand_method_func)(const RAND_METHOD *meth,
105						const RAND_METHOD **pmeth)
106	= fips_RAND_set_rand_method;
107static const RAND_METHOD *(*RAND_get_rand_method_func)
108						(const RAND_METHOD **pmeth)
109	= fips_RAND_get_rand_method;
110
111#ifndef OPENSSL_NO_ENGINE
112void int_RAND_set_callbacks(
113	int (*set_rand_func)(const RAND_METHOD *meth,
114						const RAND_METHOD **pmeth),
115	const RAND_METHOD *(*get_rand_func)
116						(const RAND_METHOD **pmeth))
117	{
118	RAND_set_rand_method_func = set_rand_func;
119	RAND_get_rand_method_func = get_rand_func;
120	}
121#endif
122
123int RAND_set_rand_method(const RAND_METHOD *meth)
124	{
125	return RAND_set_rand_method_func(meth, &default_RAND_meth);
126	}
127
128const RAND_METHOD *RAND_get_rand_method(void)
129	{
130	return RAND_get_rand_method_func(&default_RAND_meth);
131	}
132
133#else
134
135#ifndef OPENSSL_NO_ENGINE
136/* non-NULL if default_RAND_meth is ENGINE-provided */
137static ENGINE *funct_ref =NULL;
138#endif
139
140int RAND_set_rand_method(const RAND_METHOD *meth)
141	{
142#ifndef OPENSSL_NO_ENGINE
143	if(funct_ref)
144		{
145		ENGINE_finish(funct_ref);
146		funct_ref = NULL;
147		}
148#endif
149	default_RAND_meth = meth;
150	return 1;
151	}
152
153const RAND_METHOD *RAND_get_rand_method(void)
154	{
155	if (!default_RAND_meth)
156		{
157#ifndef OPENSSL_NO_ENGINE
158		ENGINE *e = ENGINE_get_default_RAND();
159		if(e)
160			{
161			default_RAND_meth = ENGINE_get_RAND(e);
162			if(!default_RAND_meth)
163				{
164				ENGINE_finish(e);
165				e = NULL;
166				}
167			}
168		if(e)
169			funct_ref = e;
170		else
171#endif
172			default_RAND_meth = RAND_SSLeay();
173		}
174	return default_RAND_meth;
175	}
176
177#ifndef OPENSSL_NO_ENGINE
178int RAND_set_rand_engine(ENGINE *engine)
179	{
180	const RAND_METHOD *tmp_meth = NULL;
181	if(engine)
182		{
183		if(!ENGINE_init(engine))
184			return 0;
185		tmp_meth = ENGINE_get_RAND(engine);
186		if(!tmp_meth)
187			{
188			ENGINE_finish(engine);
189			return 0;
190			}
191		}
192	/* This function releases any prior ENGINE so call it first */
193	RAND_set_rand_method(tmp_meth);
194	funct_ref = engine;
195	return 1;
196	}
197#endif
198
199#endif
200
201void RAND_cleanup(void)
202	{
203	const RAND_METHOD *meth = RAND_get_rand_method();
204	if (meth && meth->cleanup)
205		meth->cleanup();
206	RAND_set_rand_method(NULL);
207	}
208
209void RAND_seed(const void *buf, int num)
210	{
211	const RAND_METHOD *meth = RAND_get_rand_method();
212	if (meth && meth->seed)
213		meth->seed(buf,num);
214	}
215
216void RAND_add(const void *buf, int num, double entropy)
217	{
218	const RAND_METHOD *meth = RAND_get_rand_method();
219	if (meth && meth->add)
220		meth->add(buf,num,entropy);
221	}
222
223int RAND_bytes(unsigned char *buf, int num)
224	{
225	const RAND_METHOD *meth = RAND_get_rand_method();
226	if (meth && meth->bytes)
227		return meth->bytes(buf,num);
228	return(-1);
229	}
230
231int RAND_pseudo_bytes(unsigned char *buf, int num)
232	{
233	const RAND_METHOD *meth = RAND_get_rand_method();
234	if (meth && meth->pseudorand)
235		return meth->pseudorand(buf,num);
236	return(-1);
237	}
238
239int RAND_status(void)
240	{
241	const RAND_METHOD *meth = RAND_get_rand_method();
242	if (meth && meth->status)
243		return meth->status();
244	return 0;
245	}
246