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133.\" ========================================================================
134.\"
135.IX Title "RAND_bytes 3"
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127.TH RAND_bytes 3 "2014-10-15" "1.0.1j" "OpenSSL"
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| 136.TH RAND_bytes 3 "2015-01-15" "1.0.1l" "OpenSSL" |
137.\" For nroff, turn off justification. Always turn off hyphenation; it makes
138.\" way too many mistakes in technical documents.
139.if n .ad l
140.nh
141.SH "NAME"
142RAND_bytes, RAND_pseudo_bytes \- generate random data
143.SH "SYNOPSIS"
144.IX Header "SYNOPSIS"
145.Vb 1
146\& #include <openssl/rand.h>
147\&
148\& int RAND_bytes(unsigned char *buf, int num);
149\&
150\& int RAND_pseudo_bytes(unsigned char *buf, int num);
151.Ve
152.SH "DESCRIPTION"
153.IX Header "DESCRIPTION"
154\&\fIRAND_bytes()\fR puts \fBnum\fR cryptographically strong pseudo-random bytes
155into \fBbuf\fR. An error occurs if the \s-1PRNG\s0 has not been seeded with
156enough randomness to ensure an unpredictable byte sequence.
157.PP
158\&\fIRAND_pseudo_bytes()\fR puts \fBnum\fR pseudo-random bytes into \fBbuf\fR.
159Pseudo-random byte sequences generated by \fIRAND_pseudo_bytes()\fR will be
160unique if they are of sufficient length, but are not necessarily
161unpredictable. They can be used for non-cryptographic purposes and for
162certain purposes in cryptographic protocols, but usually not for key
163generation etc.
164.PP
165The contents of \fBbuf\fR is mixed into the entropy pool before retrieving
166the new pseudo-random bytes unless disabled at compile time (see \s-1FAQ\s0).
167.SH "RETURN VALUES"
168.IX Header "RETURN VALUES"
169\&\fIRAND_bytes()\fR returns 1 on success, 0 otherwise. The error code can be
170obtained by \fIERR_get_error\fR\|(3). \fIRAND_pseudo_bytes()\fR returns 1 if the
171bytes generated are cryptographically strong, 0 otherwise. Both
172functions return \-1 if they are not supported by the current \s-1RAND\s0
173method.
174.SH "SEE ALSO"
175.IX Header "SEE ALSO"
176\&\fIrand\fR\|(3), \fIERR_get_error\fR\|(3),
177\&\fIRAND_add\fR\|(3)
178.SH "HISTORY"
179.IX Header "HISTORY"
180\&\fIRAND_bytes()\fR is available in all versions of SSLeay and OpenSSL. It
181has a return value since OpenSSL 0.9.5. \fIRAND_pseudo_bytes()\fR was added
182in OpenSSL 0.9.5.
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