1 /* crypto/rand/randfile.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
64 #include "openssl/e_os.h"
66 #ifndef NO_SYS_TYPES_H
67 # include <sys/types.h>
72 # include <sys/stat.h>
74 #include OPENSSL_UNISTD
76 #include <openssl/rand.h>
80 #define RAND_DATA 1024
82 /* #define RFILE ".rnd" - defined in ../../e_os.h */
84 int RAND_load_file(const char *file, long bytes)
86 /* If bytes >= 0, read up to 'bytes' bytes.
87 * if bytes == -1, read complete file. */
89 MS_STATIC unsigned char buf[BUFSIZE];
94 if (file == NULL) return(0);
97 /* If the state fails, put some crap in anyway */
98 RAND_add(&sb,sizeof(sb),0);
100 if (bytes == 0) return(ret);
103 if (in == NULL) goto err;
107 n = (bytes < BUFSIZE)?(int)bytes:BUFSIZE;
112 /* even if n != i, use the full array */
118 if (bytes == 0) break;
122 memset(buf,0,BUFSIZE);
127 int RAND_write_file(const char *file)
129 unsigned char buf[BUFSIZE];
135 /* Under VMS, fopen(file, "wb") will create a new version of the
136 same file. This is not good, so let's try updating an existing
137 one, and create file only if it doesn't already exist. */
138 out=fopen(file,"rb+");
139 if (out == NULL && errno != ENOENT)
145 #if defined O_CREAT && defined O_EXCL
146 /* chmod(..., 0600) is too late to protect the file,
147 * permissions should be restrictive from the start */
148 int fd = open(file, O_CREAT | O_EXCL, 0600);
150 out = fdopen(fd, "wb");
152 out=fopen(file,"wb");
155 if (out == NULL) goto err;
162 i=(n > BUFSIZE)?BUFSIZE:n;
164 if (RAND_bytes(buf,i) <= 0)
166 i=fwrite(buf,1,i,out);
176 /* We may have updated an existing file using mode "rb+",
177 * now remove any old extra bytes */
179 ftruncate(fileno(out), ret);
183 memset(buf,0,BUFSIZE);
185 return(err ? -1 : ret);
188 const char *RAND_file_name(char *buf, int size)
193 s=getenv("RANDFILE");
196 strncpy(buf,s,size-1);
203 if (s == NULL) return(RFILE);
204 if (((int)(strlen(s)+strlen(RFILE)+2)) > size)