174 lines
5.3 KiB
Groff
174 lines
5.3 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "RAND_bytes 3"
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.TH RAND_bytes 3 "2014-10-15" "1.0.1j" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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RAND_bytes, RAND_pseudo_bytes \- generate random data
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/rand.h>
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\&
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\& int RAND_bytes(unsigned char *buf, int num);
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\&
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\& int RAND_pseudo_bytes(unsigned char *buf, int num);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fIRAND_bytes()\fR puts \fBnum\fR cryptographically strong pseudo-random bytes
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into \fBbuf\fR. An error occurs if the \s-1PRNG\s0 has not been seeded with
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enough randomness to ensure an unpredictable byte sequence.
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.PP
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\&\fIRAND_pseudo_bytes()\fR puts \fBnum\fR pseudo-random bytes into \fBbuf\fR.
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Pseudo-random byte sequences generated by \fIRAND_pseudo_bytes()\fR will be
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unique if they are of sufficient length, but are not necessarily
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unpredictable. They can be used for non-cryptographic purposes and for
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certain purposes in cryptographic protocols, but usually not for key
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generation etc.
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.PP
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The contents of \fBbuf\fR is mixed into the entropy pool before retrieving
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the new pseudo-random bytes unless disabled at compile time (see \s-1FAQ\s0).
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIRAND_bytes()\fR returns 1 on success, 0 otherwise. The error code can be
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obtained by \fIERR_get_error\fR\|(3). \fIRAND_pseudo_bytes()\fR returns 1 if the
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bytes generated are cryptographically strong, 0 otherwise. Both
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functions return \-1 if they are not supported by the current \s-1RAND\s0
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method.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIrand\fR\|(3), \fIERR_get_error\fR\|(3),
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\&\fIRAND_add\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fIRAND_bytes()\fR is available in all versions of SSLeay and OpenSSL. It
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has a return value since OpenSSL 0.9.5. \fIRAND_pseudo_bytes()\fR was added
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in OpenSSL 0.9.5.
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