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.\" ========================================================================
.\"
.IX Title "RAND_load_file 3"
.TH RAND_load_file 3 "2019-12-20" "1.0.2u" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
RAND_load_file, RAND_write_file, RAND_file_name \- PRNG seed file
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/rand.h>
\&
\& const char *RAND_file_name(char *buf, size_t num);
\&
\& int RAND_load_file(const char *filename, long max_bytes);
\&
\& int RAND_write_file(const char *filename);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBRAND_file_name()\fR generates a default path for the random seed
file. \fBbuf\fR points to a buffer of size \fBnum\fR in which to store the
filename. The seed file is \f(CW$RANDFILE\fR if that environment variable is
set, \f(CW$HOME\fR/.rnd otherwise. If \f(CW$HOME\fR is not set either, or \fBnum\fR is
too small for the path name, an error occurs.
.PP
\&\fBRAND_load_file()\fR reads a number of bytes from file \fBfilename\fR and
adds them to the \s-1PRNG.\s0 If \fBmax_bytes\fR is non-negative,
up to to \fBmax_bytes\fR are read; starting with OpenSSL 0.9.5,
if \fBmax_bytes\fR is \-1, the complete file is read.
.PP
\&\fBRAND_write_file()\fR writes a number of random bytes (currently 1024) to
file \fBfilename\fR which can be used to initialize the \s-1PRNG\s0 by calling
\&\fBRAND_load_file()\fR in a later session.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBRAND_load_file()\fR returns the number of bytes read.
.PP
\&\fBRAND_write_file()\fR returns the number of bytes written, and \-1 if the
bytes written were generated without appropriate seed.
.PP
\&\fBRAND_file_name()\fR returns a pointer to \fBbuf\fR on success, and \s-1NULL\s0 on
error.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBrand\fR\|(3), \fBRAND_add\fR\|(3), \fBRAND_cleanup\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
\&\fBRAND_load_file()\fR, \fBRAND_write_file()\fR and \fBRAND_file_name()\fR are available in
all versions of SSLeay and OpenSSL.