rand_eng.c revision 296465 
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,
79                             const RAND_METHOD **pmeth)
80{
81    if (funct_ref) {
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        ENGINE *e = ENGINE_get_default_RAND();
93        if (e) {
94            *pmeth = ENGINE_get_RAND(e);
95            if (!*pmeth) {
96                ENGINE_finish(e);
97                e = NULL;
98            }
99        }
100        if (e)
101            funct_ref = e;
102        else if (FIPS_mode())
103            *pmeth = FIPS_rand_method();
104        else
105            *pmeth = RAND_SSLeay();
106    }
107
108    if (FIPS_mode()
109        && *pmeth != FIPS_rand_check()) {
110        RANDerr(RAND_F_ENG_RAND_GET_RAND_METHOD, RAND_R_NON_FIPS_METHOD);
111        return 0;
112    }
113
114    return *pmeth;
115}
116
117int RAND_set_rand_engine(ENGINE *engine)
118{
119    const RAND_METHOD *tmp_meth = NULL;
120    if (engine) {
121        if (!ENGINE_init(engine))
122            return 0;
123        tmp_meth = ENGINE_get_RAND(engine);
124        if (!tmp_meth) {
125            ENGINE_finish(engine);
126            return 0;
127        }
128    }
129    /* This function releases any prior ENGINE so call it first */
130    RAND_set_rand_method(tmp_meth);
131    funct_ref = engine;
132    return 1;
133}
134
135void int_RAND_init_engine_callbacks(void)
136{
137    static int done = 0;
138    if (done)
139        return;
140    int_RAND_set_callbacks(eng_RAND_set_rand_method,
141                           eng_RAND_get_rand_method);
142    done = 1;
143}
144
145#endif
146