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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. | |
10621efd | 8 | * |
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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). | |
10621efd | 15 | * |
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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. | |
10621efd | 22 | * |
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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 :-). | |
10621efd | 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
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38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
10621efd | 40 | * |
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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. | |
10621efd | 52 | * |
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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 | /* ==================================================================== | |
41918458 | 59 | * Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved. |
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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 | |
10621efd | 66 | * notice, this list of conditions and the following disclaimer. |
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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 | ||
c9e1fe33 | 112 | #define NON_MAIN |
a0ad17bb | 113 | #include "apps.h" |
c9e1fe33 | 114 | #undef NON_MAIN |
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115 | #include <openssl/bio.h> |
116 | #include <openssl/rand.h> | |
117 | ||
640588bb | 118 | static int seeded = 0; |
4ec2d4d2 | 119 | static int egdsocket = 0; |
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120 | |
121 | int app_RAND_load_file(const char *file, BIO *bio_e, int dont_warn) | |
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122 | { |
123 | int consider_randfile = (file == NULL); | |
124 | char buffer[200]; | |
125 | ||
bc36ee62 | 126 | #ifdef OPENSSL_SYS_WINDOWS |
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127 | BIO_printf(bio_e, "Loading 'screen' into random state -"); |
128 | BIO_flush(bio_e); | |
129 | RAND_screen(); | |
130 | BIO_printf(bio_e, " done\n"); | |
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131 | #endif |
132 | ||
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133 | if (file == NULL) |
134 | file = RAND_file_name(buffer, sizeof buffer); | |
135 | else if (RAND_egd(file) > 0) { | |
136 | /* | |
137 | * we try if the given filename is an EGD socket. if it is, we don't | |
138 | * write anything back to the file. | |
139 | */ | |
140 | egdsocket = 1; | |
141 | return 1; | |
142 | } | |
143 | if (file == NULL || !RAND_load_file(file, -1)) { | |
144 | if (RAND_status() == 0) { | |
145 | if (!dont_warn) { | |
146 | BIO_printf(bio_e, "unable to load 'random state'\n"); | |
147 | BIO_printf(bio_e, | |
148 | "This means that the random number generator has not been seeded\n"); | |
149 | BIO_printf(bio_e, "with much random data.\n"); | |
150 | if (consider_randfile) { /* explanation does not apply when a | |
151 | * file is explicitly named */ | |
152 | BIO_printf(bio_e, | |
153 | "Consider setting the RANDFILE environment variable to point at a file that\n"); | |
154 | BIO_printf(bio_e, | |
155 | "'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 | } | |
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164 | |
165 | long app_RAND_load_files(char *name) | |
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166 | { |
167 | char *p, *n; | |
168 | int last; | |
169 | long tot = 0; | |
170 | int egd; | |
640588bb | 171 | |
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172 | for (;;) { |
173 | last = 0; | |
174 | for (p = name; ((*p != '\0') && (*p != LIST_SEPARATOR_CHAR)); p++) ; | |
175 | if (*p == '\0') | |
176 | last = 1; | |
177 | *p = '\0'; | |
178 | n = name; | |
179 | name = p + 1; | |
180 | if (*n == '\0') | |
181 | break; | |
182 | ||
183 | egd = RAND_egd(n); | |
184 | if (egd > 0) | |
185 | tot += egd; | |
186 | else | |
187 | tot += RAND_load_file(n, -1); | |
188 | if (last) | |
189 | break; | |
190 | } | |
191 | if (tot > 512) | |
192 | app_RAND_allow_write_file(); | |
193 | return (tot); | |
194 | } | |
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195 | |
196 | int app_RAND_write_file(const char *file, BIO *bio_e) | |
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197 | { |
198 | char buffer[200]; | |
199 | ||
200 | if (egdsocket || !seeded) | |
201 | /* | |
202 | * If we did not manage to read the seed file, we should not write a | |
203 | * low-entropy seed file back -- it would suppress a crucial warning | |
204 | * the next time we want to use it. | |
205 | */ | |
206 | return 0; | |
640588bb | 207 | |
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208 | if (file == NULL) |
209 | file = RAND_file_name(buffer, sizeof buffer); | |
210 | if (file == NULL || !RAND_write_file(file)) { | |
211 | BIO_printf(bio_e, "unable to write 'random state'\n"); | |
212 | return 0; | |
213 | } | |
214 | return 1; | |
215 | } | |
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216 | |
217 | void app_RAND_allow_write_file(void) | |
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218 | { |
219 | seeded = 1; | |
220 | } |