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124.\" ========================================================================
125.\"
126.IX Title "RAND_load_file 3"
127.TH RAND_load_file 3 "2010-06-01" "1.0.0a" "OpenSSL"
128.\" For nroff, turn off justification. Always turn off hyphenation; it makes
129.\" way too many mistakes in technical documents.
130.if n .ad l
131.nh
132.SH "NAME"
133RAND_load_file, RAND_write_file, RAND_file_name \- PRNG seed file
134.SH "SYNOPSIS"
135.IX Header "SYNOPSIS"
136.Vb 1
137\& #include <openssl/rand.h>
138\&
139\& const char *RAND_file_name(char *buf, size_t num);
140\&
141\& int RAND_load_file(const char *filename, long max_bytes);
142\&
143\& int RAND_write_file(const char *filename);
144.Ve
145.SH "DESCRIPTION"
146.IX Header "DESCRIPTION"
147\&\fIRAND_file_name()\fR generates a default path for the random seed
148file. \fBbuf\fR points to a buffer of size \fBnum\fR in which to store the
149filename. The seed file is \f(CW$RANDFILE\fR if that environment variable is
150set, \f(CW$HOME\fR/.rnd otherwise. If \f(CW$HOME\fR is not set either, or \fBnum\fR is
151too small for the path name, an error occurs.
152.PP
153\&\fIRAND_load_file()\fR reads a number of bytes from file \fBfilename\fR and
154adds them to the \s-1PRNG\s0. If \fBmax_bytes\fR is non-negative,
155up to to \fBmax_bytes\fR are read; starting with OpenSSL 0.9.5,
156if \fBmax_bytes\fR is \-1, the complete file is read.
157.PP
158\&\fIRAND_write_file()\fR writes a number of random bytes (currently 1024) to
159file \fBfilename\fR which can be used to initialize the \s-1PRNG\s0 by calling
160\&\fIRAND_load_file()\fR in a later session.
161.SH "RETURN VALUES"
162.IX Header "RETURN VALUES"
163\&\fIRAND_load_file()\fR returns the number of bytes read.
164.PP
165\&\fIRAND_write_file()\fR returns the number of bytes written, and \-1 if the
166bytes written were generated without appropriate seed.
167.PP
168\&\fIRAND_file_name()\fR returns a pointer to \fBbuf\fR on success, and \s-1NULL\s0 on
169error.
170.SH "SEE ALSO"
171.IX Header "SEE ALSO"
172\&\fIrand\fR\|(3), \fIRAND_add\fR\|(3), \fIRAND_cleanup\fR\|(3)
173.SH "HISTORY"
174.IX Header "HISTORY"
175\&\fIRAND_load_file()\fR, \fIRAND_write_file()\fR and \fIRAND_file_name()\fR are available in
176all versions of SSLeay and OpenSSL.