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131 .IX Title "RAND_bytes 3"
132 .TH RAND_bytes 3 "2007-03-15" "0.9.8e" "OpenSSL"
134 RAND_bytes, RAND_pseudo_bytes \- generate random data
136 .IX Header "SYNOPSIS"
138 \& #include <openssl/rand.h>
142 \& int RAND_bytes(unsigned char *buf, int num);
146 \& int RAND_pseudo_bytes(unsigned char *buf, int num);
149 .IX Header "DESCRIPTION"
150 \&\fIRAND_bytes()\fR puts \fBnum\fR cryptographically strong pseudo-random bytes
151 into \fBbuf\fR. An error occurs if the \s-1PRNG\s0 has not been seeded with
152 enough randomness to ensure an unpredictable byte sequence.
154 \&\fIRAND_pseudo_bytes()\fR puts \fBnum\fR pseudo-random bytes into \fBbuf\fR.
155 Pseudo-random byte sequences generated by \fIRAND_pseudo_bytes()\fR will be
156 unique if they are of sufficient length, but are not necessarily
157 unpredictable. They can be used for non-cryptographic purposes and for
158 certain purposes in cryptographic protocols, but usually not for key
161 .IX Header "RETURN VALUES"
162 \&\fIRAND_bytes()\fR returns 1 on success, 0 otherwise. The error code can be
163 obtained by \fIERR_get_error\fR\|(3). \fIRAND_pseudo_bytes()\fR returns 1 if the
164 bytes generated are cryptographically strong, 0 otherwise. Both
165 functions return \-1 if they are not supported by the current \s-1RAND\s0
168 .IX Header "SEE ALSO"
169 \&\fIrand\fR\|(3), \fIERR_get_error\fR\|(3),
170 \&\fIRAND_add\fR\|(3)
173 \&\fIRAND_bytes()\fR is available in all versions of SSLeay and OpenSSL. It
174 has a return value since OpenSSL 0.9.5. \fIRAND_pseudo_bytes()\fR was added