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131 .IX Title "RAND_LOAD_FILE 3"
132 .TH RAND_LOAD_FILE 3 "2018-11-20" "1.1.1a" "OpenSSL"
133 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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138 RAND_load_file, RAND_write_file, RAND_file_name \- PRNG seed file
140 .IX Header "SYNOPSIS"
142 \& #include <openssl/rand.h>
144 \& int RAND_load_file(const char *filename, long max_bytes);
146 \& int RAND_write_file(const char *filename);
148 \& const char *RAND_file_name(char *buf, size_t num);
151 .IX Header "DESCRIPTION"
152 \&\fIRAND_load_file()\fR reads a number of bytes from file \fBfilename\fR and
153 adds them to the \s-1PRNG.\s0 If \fBmax_bytes\fR is non-negative,
154 up to \fBmax_bytes\fR are read;
155 if \fBmax_bytes\fR is \-1, the complete file is read.
156 Do not load the same file multiple times unless its contents have
157 been updated by \fIRAND_write_file()\fR between reads.
158 Also, note that \fBfilename\fR should be adequately protected so that an
159 attacker cannot replace or examine the contents.
160 If \fBfilename\fR is not a regular file, then user is considered to be
161 responsible for any side effects, e.g. non-anticipated blocking or
162 capture of controlling terminal.
164 \&\fIRAND_write_file()\fR writes a number of random bytes (currently 128) to
165 file \fBfilename\fR which can be used to initialize the \s-1PRNG\s0 by calling
166 \&\fIRAND_load_file()\fR in a later session.
168 \&\fIRAND_file_name()\fR generates a default path for the random seed
169 file. \fBbuf\fR points to a buffer of size \fBnum\fR in which to store the
172 On all systems, if the environment variable \fB\s-1RANDFILE\s0\fR is set, its
173 value will be used as the seed file name.
174 Otherwise, the file is called \f(CW\*(C`.rnd\*(C'\fR, found in platform dependent locations:
175 .IP "On Windows (in order of preference)" 4
176 .IX Item "On Windows (in order of preference)"
178 \& %HOME%, %USERPROFILE%, %SYSTEMROOT%, C:\e
180 .IP "On \s-1VMS\s0" 4
185 .IP "On all other systems" 4
186 .IX Item "On all other systems"
191 If \f(CW$HOME\fR (on non-Windows and non-VMS system) is not set either, or
192 \&\fBnum\fR is too small for the path name, an error occurs.
194 .IX Header "RETURN VALUES"
195 \&\fIRAND_load_file()\fR returns the number of bytes read or \-1 on error.
197 \&\fIRAND_write_file()\fR returns the number of bytes written, or \-1 if the
198 bytes written were generated without appropriate seeding.
200 \&\fIRAND_file_name()\fR returns a pointer to \fBbuf\fR on success, and \s-1NULL\s0 on
203 .IX Header "SEE ALSO"
204 \&\fIRAND_add\fR\|(3),
205 \&\fIRAND_bytes\fR\|(3),
206 \&\s-1\fIRAND\s0\fR\|(7)
208 .IX Header "COPYRIGHT"
209 Copyright 2000\-2018 The OpenSSL Project Authors. All Rights Reserved.
211 Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
212 this file except in compliance with the License. You can obtain a copy
213 in the file \s-1LICENSE\s0 in the source distribution or at
214 <https://www.openssl.org/source/license.html>.