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d02b48c6 | 1 | /* crypto/rand/randfile.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
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 | ||
7d7d2cbc | 59 | #include <errno.h> |
d02b48c6 | 60 | #include <stdio.h> |
a224de3f BL |
61 | #include <stdlib.h> |
62 | #include <string.h> | |
dfeab068 | 63 | #include <sys/types.h> |
d02b48c6 RE |
64 | #include <sys/stat.h> |
65 | #include <sys/types.h> | |
17e3dd1c BM |
66 | |
67 | #ifndef FLAT_INC | |
68 | # include "../e_os.h" | |
69 | #else | |
70 | # include "e_os.h" | |
71 | #endif | |
72 | ||
ec577822 | 73 | #include <openssl/rand.h> |
d02b48c6 RE |
74 | |
75 | #undef BUFSIZE | |
76 | #define BUFSIZE 1024 | |
77 | #define RAND_DATA 1024 | |
78 | ||
79 | /* #define RFILE ".rand" - defined in ../../e_os.h */ | |
80 | ||
6b691a5c | 81 | int RAND_load_file(const char *file, long bytes) |
d02b48c6 RE |
82 | { |
83 | MS_STATIC unsigned char buf[BUFSIZE]; | |
84 | struct stat sb; | |
85 | int i,ret=0,n; | |
86 | FILE *in; | |
87 | ||
88 | if (file == NULL) return(0); | |
89 | ||
90 | i=stat(file,&sb); | |
91 | /* If the state fails, put some crap in anyway */ | |
bf5dcd13 | 92 | RAND_seed(&sb,sizeof(sb)); |
d02b48c6 RE |
93 | ret+=sizeof(sb); |
94 | if (i < 0) return(0); | |
95 | if (bytes <= 0) return(ret); | |
96 | ||
41c62a8e | 97 | in=fopen(file,"rb"); |
d02b48c6 RE |
98 | if (in == NULL) goto err; |
99 | for (;;) | |
100 | { | |
101 | n=(bytes < BUFSIZE)?(int)bytes:BUFSIZE; | |
102 | i=fread(buf,1,n,in); | |
103 | if (i <= 0) break; | |
104 | /* even if n != i, use the full array */ | |
105 | RAND_seed(buf,n); | |
106 | ret+=i; | |
107 | bytes-=n; | |
108 | if (bytes <= 0) break; | |
109 | } | |
110 | fclose(in); | |
111 | memset(buf,0,BUFSIZE); | |
112 | err: | |
113 | return(ret); | |
114 | } | |
115 | ||
6b691a5c | 116 | int RAND_write_file(const char *file) |
d02b48c6 RE |
117 | { |
118 | unsigned char buf[BUFSIZE]; | |
119 | int i,ret=0; | |
120 | FILE *out; | |
121 | int n; | |
122 | ||
7d7d2cbc UM |
123 | /* Under VMS, fopen(file, "wb") will craete a new version of the |
124 | same file. This is not good, so let's try updating an existing | |
125 | one, and create file only if it doesn't already exist. This | |
126 | should be completely harmless on system that have no file | |
127 | versions. -- Richard Levitte */ | |
128 | out=fopen(file,"rb+"); | |
129 | if (out == NULL && errno == ENOENT) | |
130 | { | |
131 | errno = 0; | |
132 | out=fopen(file,"wb"); | |
133 | } | |
d02b48c6 RE |
134 | if (out == NULL) goto err; |
135 | chmod(file,0600); | |
136 | n=RAND_DATA; | |
137 | for (;;) | |
138 | { | |
139 | i=(n > BUFSIZE)?BUFSIZE:n; | |
140 | n-=BUFSIZE; | |
141 | RAND_bytes(buf,i); | |
142 | i=fwrite(buf,1,i,out); | |
143 | if (i <= 0) | |
144 | { | |
145 | ret=0; | |
146 | break; | |
147 | } | |
148 | ret+=i; | |
149 | if (n <= 0) break; | |
150 | } | |
151 | fclose(out); | |
152 | memset(buf,0,BUFSIZE); | |
153 | err: | |
154 | return(ret); | |
155 | } | |
156 | ||
6b691a5c | 157 | char *RAND_file_name(char *buf, int size) |
d02b48c6 RE |
158 | { |
159 | char *s; | |
160 | char *ret=NULL; | |
161 | ||
162 | s=getenv("RANDFILE"); | |
163 | if (s != NULL) | |
164 | { | |
165 | strncpy(buf,s,size-1); | |
166 | buf[size-1]='\0'; | |
167 | ret=buf; | |
168 | } | |
169 | else | |
170 | { | |
171 | s=getenv("HOME"); | |
172 | if (s == NULL) return(RFILE); | |
173 | if (((int)(strlen(s)+strlen(RFILE)+2)) > size) | |
174 | return(RFILE); | |
175 | strcpy(buf,s); | |
7d7d2cbc | 176 | #ifndef VMS |
d02b48c6 | 177 | strcat(buf,"/"); |
7d7d2cbc | 178 | #endif |
d02b48c6 RE |
179 | strcat(buf,RFILE); |
180 | ret=buf; | |
181 | } | |
182 | return(ret); | |
183 | } |