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+.\" ======================================================================
+.\"
+.IX Title "RAND_BYTES 1"
+.TH RAND_BYTES 1 "perl v5.6.1" "2000-04-13" "User Contributed Perl Documentation"
+.UC
+.SH "NAME"
+RAND_bytes, RAND_pseudo_bytes \- generate random data
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/rand.h>
+.Ve
+.Vb 1
+\& int RAND_bytes(unsigned char *buf, int num);
+.Ve
+.Vb 1
+\& int RAND_pseudo_bytes(unsigned char *buf, int num);
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+\&\fIRAND_bytes()\fR puts \fBnum\fR cryptographically strong pseudo-random bytes
+into \fBbuf\fR. An error occurs if the \s-1PRNG\s0 has not been seeded with
+enough randomness to ensure an unpredictable byte sequence.
+.PP
+\&\fIRAND_pseudo_bytes()\fR puts \fBnum\fR pseudo-random bytes into \fBbuf\fR.
+Pseudo-random byte sequences generated by \fIRAND_pseudo_bytes()\fR will be
+unique if they are of sufficient length, but are not necessarily
+unpredictable. They can be used for non-cryptographic purposes and for
+certain purposes in cryptographic protocols, but usually not for key
+generation etc.
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+\&\fIRAND_bytes()\fR returns 1 on success, 0 otherwise. The error code can be
+obtained by ERR_get_error(3). \fIRAND_pseudo_bytes()\fR returns 1 if the
+bytes generated are cryptographically strong, 0 otherwise. Both
+functions return \-1 if they are not supported by the current \s-1RAND\s0
+method.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+rand(3), err(3), RAND_add(3)
+.SH "HISTORY"
+.IX Header "HISTORY"
+\&\fIRAND_bytes()\fR is available in all versions of SSLeay and OpenSSL.  It
+has a return value since OpenSSL 0.9.5. \fIRAND_pseudo_bytes()\fR was added
+in OpenSSL 0.9.5.