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134 .IX Title "RAND_load_file 3"
135 .TH RAND_load_file 3 "2009-04-11" "0.9.8k" "OpenSSL"
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141 RAND_load_file, RAND_write_file, RAND_file_name \- PRNG seed file
143 .IX Header "SYNOPSIS"
145 \& #include <openssl/rand.h>
147 \& const char *RAND_file_name(char *buf, size_t num);
149 \& int RAND_load_file(const char *filename, long max_bytes);
151 \& int RAND_write_file(const char *filename);
154 .IX Header "DESCRIPTION"
155 \&\fIRAND_file_name()\fR generates a default path for the random seed
156 file. \fBbuf\fR points to a buffer of size \fBnum\fR in which to store the
157 filename. The seed file is \f(CW$RANDFILE\fR if that environment variable is
158 set, \f(CW$HOME\fR/.rnd otherwise. If \f(CW$HOME\fR is not set either, or \fBnum\fR is
159 too small for the path name, an error occurs.
161 \&\fIRAND_load_file()\fR reads a number of bytes from file \fBfilename\fR and
162 adds them to the \s-1PRNG\s0. If \fBmax_bytes\fR is non-negative,
163 up to to \fBmax_bytes\fR are read; starting with OpenSSL 0.9.5,
164 if \fBmax_bytes\fR is \-1, the complete file is read.
166 \&\fIRAND_write_file()\fR writes a number of random bytes (currently 1024) to
167 file \fBfilename\fR which can be used to initialize the \s-1PRNG\s0 by calling
168 \&\fIRAND_load_file()\fR in a later session.
170 .IX Header "RETURN VALUES"
171 \&\fIRAND_load_file()\fR returns the number of bytes read.
173 \&\fIRAND_write_file()\fR returns the number of bytes written, and \-1 if the
174 bytes written were generated without appropriate seed.
176 \&\fIRAND_file_name()\fR returns a pointer to \fBbuf\fR on success, and \s-1NULL\s0 on
179 .IX Header "SEE ALSO"
180 \&\fIrand\fR\|(3), \fIRAND_add\fR\|(3), \fIRAND_cleanup\fR\|(3)
183 \&\fIRAND_load_file()\fR, \fIRAND_write_file()\fR and \fIRAND_file_name()\fR are available in
184 all versions of SSLeay and OpenSSL.