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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. | |
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 | |
119 static int seeded = 0; | |
120 static int egdsocket = 0; | |
121 | |
122 int 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 num
ber generator has not been seeded\n"); | |
151 BIO_printf(bio_e,"with much random data.\n"); | |
152 if (consider_randfile) /* explanation does not a
pply when a file is explicitly named */ | |
153 { | |
154 BIO_printf(bio_e,"Consider setting the R
ANDFILE environment variable to point at a file that\n"); | |
155 BIO_printf(bio_e,"'random' data can be k
ept in (the file will be overwritten).\n"); | |
156 } | |
157 } | |
158 return 0; | |
159 } | |
160 } | |
161 seeded = 1; | |
162 return 1; | |
163 } | |
164 | |
165 long 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 | |
194 int 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 | |
215 void app_RAND_allow_write_file(void) | |
216 { | |
217 seeded = 1; | |
218 } | |
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