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126 .IX Title "RAND_load_file 3"
127 .TH RAND_load_file 3 "2007-10-24" "0.9.8g" "OpenSSL"
128 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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133 RAND_load_file, RAND_write_file, RAND_file_name \- PRNG seed file
135 .IX Header "SYNOPSIS"
137 \& #include <openssl/rand.h>
139 \& const char *RAND_file_name(char *buf, size_t num);
141 \& int RAND_load_file(const char *filename, long max_bytes);
143 \& int RAND_write_file(const char *filename);
146 .IX Header "DESCRIPTION"
147 \&\fIRAND_file_name()\fR generates a default path for the random seed
148 file. \fBbuf\fR points to a buffer of size \fBnum\fR in which to store the
149 filename. The seed file is \f(CW$RANDFILE\fR if that environment variable is
150 set, \f(CW$HOME\fR/.rnd otherwise. If \f(CW$HOME\fR is not set either, or \fBnum\fR is
151 too small for the path name, an error occurs.
153 \&\fIRAND_load_file()\fR reads a number of bytes from file \fBfilename\fR and
154 adds them to the \s-1PRNG\s0. If \fBmax_bytes\fR is non-negative,
155 up to to \fBmax_bytes\fR are read; starting with OpenSSL 0.9.5,
156 if \fBmax_bytes\fR is \-1, the complete file is read.
158 \&\fIRAND_write_file()\fR writes a number of random bytes (currently 1024) to
159 file \fBfilename\fR which can be used to initialize the \s-1PRNG\s0 by calling
160 \&\fIRAND_load_file()\fR in a later session.
162 .IX Header "RETURN VALUES"
163 \&\fIRAND_load_file()\fR returns the number of bytes read.
165 \&\fIRAND_write_file()\fR returns the number of bytes written, and \-1 if the
166 bytes written were generated without appropriate seed.
168 \&\fIRAND_file_name()\fR returns a pointer to \fBbuf\fR on success, and \s-1NULL\s0 on
171 .IX Header "SEE ALSO"
172 \&\fIrand\fR\|(3), \fIRAND_add\fR\|(3), \fIRAND_cleanup\fR\|(3)
175 \&\fIRAND_load_file()\fR, \fIRAND_write_file()\fR and \fIRAND_file_name()\fR are available in
176 all versions of SSLeay and OpenSSL.