1/* apps/app_rand.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 * Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved.
60 *
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
63 * are met:
64 *
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
67 *
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
71 * distribution.
72 *
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77 *
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
82 *
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
86 *
87 * 6. Redistributions of any form whatsoever must retain the following
88 * acknowledgment:
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 *
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
105 *
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
109 *
110 */
111
112#define NON_MAIN
113#include "apps.h"
114#undef NON_MAIN
115#include <openssl/bio.h>
116#include <openssl/rand.h>
117
118
119static int seeded = 0;
120static int egdsocket = 0;
121
122int app_RAND_load_file(const char *file, BIO *bio_e, int dont_warn)
123 {
124 int consider_randfile = (file == NULL);
125 char buffer[200];
126
127#ifdef OPENSSL_SYS_WINDOWS
128 BIO_printf(bio_e,"Loading 'screen' into random state -");
129 BIO_flush(bio_e);
130 RAND_screen();
131 BIO_printf(bio_e," done\n");
132#endif
133
134 if (file == NULL)
135 file = RAND_file_name(buffer, sizeof buffer);
136 else if (RAND_egd(file) > 0)
137 {
138 /* we try if the given filename is an EGD socket.
139 if it is, we don't write anything back to the file. */
140 egdsocket = 1;
141 return 1;
142 }
143 if (file == NULL || !RAND_load_file(file, -1))
144 {
145 if (RAND_status() == 0)
146 {
147 if (!dont_warn)
148 {
149 BIO_printf(bio_e,"unable to load 'random state'\n");
150 BIO_printf(bio_e,"This means that the random number generator has not been seeded\n");
151 BIO_printf(bio_e,"with much random data.\n");
152 if (consider_randfile) /* explanation does not apply when a file is explicitly named */
153 {
154 BIO_printf(bio_e,"Consider setting the RANDFILE environment variable to point at a file that\n");
155 BIO_printf(bio_e,"'random' data can be kept in (the file will be overwritten).\n");
156 }
157 }
158 return 0;
159 }
160 }
161 seeded = 1;
162 return 1;
163 }
164
165long app_RAND_load_files(char *name)
166 {
167 char *p,*n;
168 int last;
169 long tot=0;
170 int egd;
171
172 for (;;)
173 {
174 last=0;
175 for (p=name; ((*p != '\0') && (*p != LIST_SEPARATOR_CHAR)); p++);
176 if (*p == '\0') last=1;
177 *p='\0';
178 n=name;
179 name=p+1;
180 if (*n == '\0') break;
181
182 egd=RAND_egd(n);
183 if (egd > 0)
184 tot+=egd;
185 else
186 tot+=RAND_load_file(n,-1);
187 if (last) break;
188 }
189 if (tot > 512)
190 app_RAND_allow_write_file();
191 return(tot);
192 }
193
194int app_RAND_write_file(const char *file, BIO *bio_e)
195 {
196 char buffer[200];
197
198 if (egdsocket || !seeded)
199 /* If we did not manage to read the seed file,
200 * we should not write a low-entropy seed file back --
201 * it would suppress a crucial warning the next time
202 * we want to use it. */
203 return 0;
204
205 if (file == NULL)
206 file = RAND_file_name(buffer, sizeof buffer);
207 if (file == NULL || !RAND_write_file(file))
208 {
209 BIO_printf(bio_e,"unable to write 'random state'\n");
210 return 0;
211 }
212 return 1;
213 }
214
215void app_RAND_allow_write_file(void)
216 {
217 seeded = 1;
218 }
219