Update build for OpenSSL-0.9.8j upgrade.
[dragonfly.git] / secure / lib / libcrypto / man / RAND_bytes.3
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132.\" ========================================================================
133.\"
134.IX Title "RAND_bytes 3"
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135.TH RAND_bytes 3 "2009-01-11" "0.9.8j" "OpenSSL"
136.\" For nroff, turn off justification. Always turn off hyphenation; it makes
137.\" way too many mistakes in technical documents.
138.if n .ad l
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140.SH "NAME"
141RAND_bytes, RAND_pseudo_bytes \- generate random data
142.SH "SYNOPSIS"
8b0cefbb 143.IX Header "SYNOPSIS"
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144.Vb 1
145\& #include <openssl/rand.h>
e257b235 146\&
984263bc 147\& int RAND_bytes(unsigned char *buf, int num);
e257b235 148\&
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149\& int RAND_pseudo_bytes(unsigned char *buf, int num);
150.Ve
151.SH "DESCRIPTION"
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152.IX Header "DESCRIPTION"
153\&\fIRAND_bytes()\fR puts \fBnum\fR cryptographically strong pseudo-random bytes
154into \fBbuf\fR. An error occurs if the \s-1PRNG\s0 has not been seeded with
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155enough randomness to ensure an unpredictable byte sequence.
156.PP
8b0cefbb 157\&\fIRAND_pseudo_bytes()\fR puts \fBnum\fR pseudo-random bytes into \fBbuf\fR.
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158Pseudo-random byte sequences generated by \fIRAND_pseudo_bytes()\fR will be
159unique if they are of sufficient length, but are not necessarily
160unpredictable. They can be used for non-cryptographic purposes and for
161certain purposes in cryptographic protocols, but usually not for key
162generation etc.
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163.PP
164The contents of \fBbuf\fR is mixed into the entropy pool before retrieving
165the new pseudo-random bytes unless disabled at compile time (see \s-1FAQ\s0).
984263bc 166.SH "RETURN VALUES"
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167.IX Header "RETURN VALUES"
168\&\fIRAND_bytes()\fR returns 1 on success, 0 otherwise. The error code can be
169obtained by \fIERR_get_error\fR\|(3). \fIRAND_pseudo_bytes()\fR returns 1 if the
984263bc 170bytes generated are cryptographically strong, 0 otherwise. Both
8b0cefbb 171functions return \-1 if they are not supported by the current \s-1RAND\s0
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172method.
173.SH "SEE ALSO"
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174.IX Header "SEE ALSO"
175\&\fIrand\fR\|(3), \fIERR_get_error\fR\|(3),
176\&\fIRAND_add\fR\|(3)
984263bc 177.SH "HISTORY"
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178.IX Header "HISTORY"
179\&\fIRAND_bytes()\fR is available in all versions of SSLeay and OpenSSL. It
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180has a return value since OpenSSL 0.9.5. \fIRAND_pseudo_bytes()\fR was added
181in OpenSSL 0.9.5.