randfile.c revision 72613
1/* crypto/rand/randfile.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#include <errno.h> 60#include <stdio.h> 61#include <stdlib.h> 62#include <string.h> 63 64#ifdef VMS 65#include <unixio.h> 66#endif 67#ifndef NO_SYS_TYPES_H 68# include <sys/types.h> 69#endif 70#ifdef MAC_OS_pre_X 71# include <stat.h> 72#else 73# include <sys/stat.h> 74#endif 75 76#include <openssl/e_os.h> 77#include <openssl/crypto.h> 78#include <openssl/rand.h> 79 80#undef BUFSIZE 81#define BUFSIZE 1024 82#define RAND_DATA 1024 83 84/* #define RFILE ".rnd" - defined in ../../e_os.h */ 85 86/* Note that these functions are intended for seed files only. 87 * Entropy devices and EGD sockets are handled in rand_unix.c */ 88 89int RAND_load_file(const char *file, long bytes) 90 { 91 /* If bytes >= 0, read up to 'bytes' bytes. 92 * if bytes == -1, read complete file. */ 93 94 MS_STATIC unsigned char buf[BUFSIZE]; 95 struct stat sb; 96 int i,ret=0,n; 97 FILE *in; 98 99 if (file == NULL) return(0); 100 101 i=stat(file,&sb); 102 /* If the state fails, put some crap in anyway */ 103 RAND_add(&sb,sizeof(sb),0); 104 if (i < 0) return(0); 105 if (bytes == 0) return(ret); 106 107 in=fopen(file,"rb"); 108 if (in == NULL) goto err; 109 for (;;) 110 { 111 if (bytes > 0) 112 n = (bytes < BUFSIZE)?(int)bytes:BUFSIZE; 113 else 114 n = BUFSIZE; 115 i=fread(buf,1,n,in); 116 if (i <= 0) break; 117 /* even if n != i, use the full array */ 118 RAND_add(buf,n,i); 119 ret+=i; 120 if (bytes > 0) 121 { 122 bytes-=n; 123 if (bytes <= 0) break; 124 } 125 } 126 fclose(in); 127 memset(buf,0,BUFSIZE); 128err: 129 return(ret); 130 } 131 132int RAND_write_file(const char *file) 133 { 134 unsigned char buf[BUFSIZE]; 135 int i,ret=0,rand_err=0; 136 FILE *out = NULL; 137 int n; 138 139#if defined(O_CREAT) && !defined(WIN32) 140 /* For some reason Win32 can't write to files created this way */ 141 142 /* chmod(..., 0600) is too late to protect the file, 143 * permissions should be restrictive from the start */ 144 int fd = open(file, O_CREAT, 0600); 145 if (fd != -1) 146 out = fdopen(fd, "wb"); 147#endif 148 if (out == NULL) 149 out = fopen(file,"wb"); 150 if (out == NULL) goto err; 151 152#ifndef NO_CHMOD 153 chmod(file,0600); 154#endif 155 n=RAND_DATA; 156 for (;;) 157 { 158 i=(n > BUFSIZE)?BUFSIZE:n; 159 n-=BUFSIZE; 160 if (RAND_bytes(buf,i) <= 0) 161 rand_err=1; 162 i=fwrite(buf,1,i,out); 163 if (i <= 0) 164 { 165 ret=0; 166 break; 167 } 168 ret+=i; 169 if (n <= 0) break; 170 } 171#ifdef VMS 172 /* Try to delete older versions of the file, until there aren't 173 any */ 174 { 175 char *tmpf; 176 177 tmpf = OPENSSL_malloc(strlen(file) + 4); /* to add ";-1" and a nul */ 178 if (tmpf) 179 { 180 strcpy(tmpf, file); 181 strcat(tmpf, ";-1"); 182 while(delete(tmpf) == 0) 183 ; 184 rename(file,";1"); /* Make sure it's version 1, or we 185 will reach the limit (32767) at 186 some point... */ 187 } 188 } 189#endif /* VMS */ 190 191 fclose(out); 192 memset(buf,0,BUFSIZE); 193err: 194 return (rand_err ? -1 : ret); 195 } 196 197const char *RAND_file_name(char *buf, int size) 198 { 199 char *s; 200 char *ret=NULL; 201 202 s=getenv("RANDFILE"); 203 if (s != NULL) 204 { 205 strncpy(buf,s,size-1); 206 buf[size-1]='\0'; 207 ret=buf; 208 } 209 else 210 { 211 s=getenv("HOME"); 212 if (s == NULL) return(RFILE); 213 if (((int)(strlen(s)+strlen(RFILE)+2)) > size) 214 return(RFILE); 215 strcpy(buf,s); 216#ifndef VMS 217 strcat(buf,"/"); 218#endif 219 strcat(buf,RFILE); 220 ret=buf; 221 } 222 return(ret); 223 } 224