app_rand.c revision 285830
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 118static int seeded = 0; 119static int egdsocket = 0; 120 121int app_RAND_load_file(const char *file, BIO *bio_e, int dont_warn) 122{ 123 int consider_randfile = (file == NULL); 124 char buffer[200]; 125 126#ifdef OPENSSL_SYS_WINDOWS 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"); 131#endif 132 133 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} 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 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} 195 196int app_RAND_write_file(const char *file, BIO *bio_e) 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; 207 208 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} 216 217void app_RAND_allow_write_file(void) 218{ 219 seeded = 1; 220} 221