source: trunk/sys/libcrypto/others/rand_eng.c @ 1

Last change on this file since 1 was 1, checked in by alain, 5 years ago

First import

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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
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