rand_eng.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 "rand_lcl.h"
63#include <openssl/rand.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
73#if defined(OPENSSL_FIPS) && !defined(OPENSSL_NO_ENGINE)
74
75/* non-NULL if default_RAND_meth is ENGINE-provided */
76static ENGINE *funct_ref =NULL;
77
78int eng_RAND_set_rand_method(const RAND_METHOD *meth, const RAND_METHOD **pmeth)
79	{
80	if(funct_ref)
81		{
82		ENGINE_finish(funct_ref);
83		funct_ref = NULL;
84		}
85	*pmeth = meth;
86	return 1;
87	}
88
89const RAND_METHOD *eng_RAND_get_rand_method(const RAND_METHOD **pmeth)
90	{
91	if (!*pmeth)
92		{
93		ENGINE *e = ENGINE_get_default_RAND();
94		if(e)
95			{
96			*pmeth = ENGINE_get_RAND(e);
97			if(!*pmeth)
98				{
99				ENGINE_finish(e);
100				e = NULL;
101				}
102			}
103		if(e)
104			funct_ref = e;
105		else
106			if(FIPS_mode())
107				*pmeth=FIPS_rand_method();
108			else
109			*pmeth = RAND_SSLeay();
110		}
111
112	if(FIPS_mode()
113		&& *pmeth != FIPS_rand_check())
114	    {
115	    RANDerr(RAND_F_ENG_RAND_GET_RAND_METHOD,RAND_R_NON_FIPS_METHOD);
116	    return 0;
117	    }
118
119	return *pmeth;
120	}
121
122int RAND_set_rand_engine(ENGINE *engine)
123	{
124	const RAND_METHOD *tmp_meth = NULL;
125	if(engine)
126		{
127		if(!ENGINE_init(engine))
128			return 0;
129		tmp_meth = ENGINE_get_RAND(engine);
130		if(!tmp_meth)
131			{
132			ENGINE_finish(engine);
133			return 0;
134			}
135		}
136	/* This function releases any prior ENGINE so call it first */
137	RAND_set_rand_method(tmp_meth);
138	funct_ref = engine;
139	return 1;
140	}
141
142void int_RAND_init_engine_callbacks(void)
143	{
144	static int done = 0;
145	if (done)
146		return;
147	int_RAND_set_callbacks(eng_RAND_set_rand_method,
148				 eng_RAND_get_rand_method);
149	done = 1;
150	}
151
152#endif
153