app_rand.c revision 72613
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 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 && !dont_warn) 146 { 147 BIO_printf(bio_e,"unable to load 'random state'\n"); 148 BIO_printf(bio_e,"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 file is explicitly named */ 151 { 152 BIO_printf(bio_e,"Consider setting the RANDFILE environment variable to point at a file that\n"); 153 BIO_printf(bio_e,"'random' data can be kept in (the file will be overwritten).\n"); 154 } 155 } 156 return 0; 157 } 158 seeded = 1; 159 return 1; 160 } 161 162long app_RAND_load_files(char *name) 163 { 164 char *p,*n; 165 int last; 166 long tot=0; 167 int egd; 168 169 for (;;) 170 { 171 last=0; 172 for (p=name; ((*p != '\0') && (*p != LIST_SEPARATOR_CHAR)); p++); 173 if (*p == '\0') last=1; 174 *p='\0'; 175 n=name; 176 name=p+1; 177 if (*n == '\0') break; 178 179 egd=RAND_egd(n); 180 if (egd > 0) 181 tot+=egd; 182 else 183 tot+=RAND_load_file(n,-1); 184 if (last) break; 185 } 186 if (tot > 512) 187 app_RAND_allow_write_file(); 188 return(tot); 189 } 190 191int app_RAND_write_file(const char *file, BIO *bio_e) 192 { 193 char buffer[200]; 194 195 if (egdsocket || !seeded) 196 /* If we did not manage to read the seed file, 197 * we should not write a low-entropy seed file back -- 198 * it would suppress a crucial warning the next time 199 * we want to use it. */ 200 return 0; 201 202 if (file == NULL) 203 file = RAND_file_name(buffer, sizeof buffer); 204 if (file == NULL || !RAND_write_file(file)) 205 { 206 BIO_printf(bio_e,"unable to write 'random state'\n"); 207 return 0; 208 } 209 return 1; 210 } 211 212void app_RAND_allow_write_file(void) 213 { 214 seeded = 1; 215 } 216