f4401cd869
alter des.h to be friendly with openssl/des.h (you can include both in the same file) make libkrb to depend on libdes. bump major. massage various portioin of heimdal to be friendly with openssl 0.9.7b.
188 lines
5.4 KiB
Groff
188 lines
5.4 KiB
Groff
.\" $NetBSD: RAND_bytes.3,v 1.12 2003/07/24 14:16:42 itojun Exp $
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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 "0.9.7b" "2002-09-25" "OpenSSL"
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.UC
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.SH "NAME"
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RAND_bytes, RAND_pseudo_bytes \- generate random data
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.SH "LIBRARY"
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libcrypto, -lcrypto
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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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.Ve
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.Vb 1
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\& int RAND_bytes(unsigned char *buf, int num);
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.Ve
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.Vb 1
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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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.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 ERR_get_error(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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openssl_rand(3), ERR_get_error(3),
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RAND_add(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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