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 #include <sys/param.h>
113 #include <syskern/libckern.h>
114 #include <string.h>
115 #define NON_MAIN
116 #include "apps.h"
117 #undef NON_MAIN
118 #include <openssl/bio.h>
119 #include <openssl/rand.h>
120
121 __RCSID("$MirOS: src/lib/libssl/src/apps/app_rand.c,v 1.7 2014/05/29 00:58:12 tg Exp $");
122
123 static int seeded = 0;
124 static int egdsocket = 0;
125
app_RAND_load_file(const char * file,BIO * bio_e,int dont_warn)126 int app_RAND_load_file(const char *file, BIO *bio_e, int dont_warn)
127 {
128 int consider_randfile = (file == NULL);
129 char buffer[200];
130
131 #ifdef OPENSSL_SYS_WINDOWS
132 BIO_printf(bio_e,"Loading 'screen' into random state -");
133 BIO_flush(bio_e);
134 RAND_screen();
135 BIO_printf(bio_e," done\n");
136 #endif
137
138 if (file == NULL)
139 file = RAND_file_name(buffer, sizeof buffer);
140 else if (RAND_egd(file) > 0)
141 {
142 /* we try if the given filename is an EGD socket.
143 if it is, we don't write anything back to the file. */
144 egdsocket = 1;
145 return 1;
146 }
147 if (file == NULL || !RAND_load_file(file, -1))
148 {
149 if (RAND_status() == 0)
150 {
151 if (!dont_warn)
152 {
153 BIO_printf(bio_e,"unable to load 'random state'\n");
154 BIO_printf(bio_e,"This means that the random number generator has not been seeded\n");
155 BIO_printf(bio_e,"with much random data.\n");
156 if (consider_randfile) /* explanation does not apply when a file is explicitly named */
157 {
158 BIO_printf(bio_e,"Consider setting the RANDFILE environment variable to point at a file that\n");
159 BIO_printf(bio_e,"'random' data can be kept in (the file will be overwritten).\n");
160 }
161 }
162 return 0;
163 }
164 }
165 seeded = 1;
166 return 1;
167 }
168
app_RAND_load_files(char * name)169 long app_RAND_load_files(char *name)
170 {
171 char *p,*n;
172 int last;
173 long tot=0;
174 int egd;
175
176 for (;;)
177 {
178 last=0;
179 for (p=name; ((*p != '\0') && (*p != LIST_SEPARATOR_CHAR)); p++);
180 if (*p == '\0') last=1;
181 *p='\0';
182 n=name;
183 name=p+1;
184 if (*n == '\0') break;
185
186 egd=RAND_egd(n);
187 if (egd > 0)
188 tot+=egd;
189 else
190 tot+=RAND_load_file(n,-1);
191 if (last) break;
192 }
193 if (tot > 512)
194 app_RAND_allow_write_file();
195 return(tot);
196 }
197
app_RAND_write_file(const char * file,BIO * bio_e)198 int app_RAND_write_file(const char *file, BIO *bio_e)
199 {
200 char buffer[200];
201
202 if (egdsocket || !seeded)
203 /* If we did not manage to read the seed file,
204 * we should not write a low-entropy seed file back --
205 * it would suppress a crucial warning the next time
206 * we want to use it. */
207 return 0;
208
209 if (file == NULL)
210 file = RAND_file_name(buffer, sizeof buffer);
211 if (file == NULL || !RAND_write_file(file))
212 {
213 BIO_printf(bio_e,"unable to write 'random state'\n");
214 return 0;
215 }
216 return 1;
217 }
218
app_RAND_allow_write_file(void)219 void app_RAND_allow_write_file(void)
220 {
221 seeded = 1;
222 }
223
224 extern void arc4random_ctl(unsigned int);
225 void
app_RAND_pushback(uint32_t x1,uint32_t x2,uint32_t x3,uint32_t x4)226 app_RAND_pushback(uint32_t x1, uint32_t x2, uint32_t x3, uint32_t x4)
227 {
228 static time_t next;
229 struct {
230 uint32_t x[4];
231 time_t now, next;
232 void *sp;
233 } x;
234
235 x.x[0] = x1;
236 x.x[1] = x2;
237 x.x[2] = x3;
238 x.x[3] = x4;
239 x.now = time(NULL);
240 x.next = next;
241 x.sp = &x;
242 arc4random_pushb_fast(&x, sizeof(x));
243 if (next < x.now) {
244 arc4random_ctl(2);
245 next = x.now + 240 + arc4random_uniform(120);
246 }
247 explicit_bzero(&x, sizeof(x));
248 }
249