202 lines
6.2 KiB
Groff
202 lines
6.2 KiB
Groff
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.\" Thu May 9 13:18:12 2002
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.\" ======================================================================
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.\"
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.IX Title "RAND_EGD 1"
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.TH RAND_EGD 1 "perl v5.6.1" "2001-02-18" "User Contributed Perl Documentation"
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.UC
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.SH "NAME"
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RAND_egd \- query entropy gathering daemon
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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 2
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\& int RAND_egd(const char *path);
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\& int RAND_egd_bytes(const char *path, int bytes);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fIRAND_egd()\fR queries the entropy gathering daemon \s-1EGD\s0 on socket \fBpath\fR.
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It queries 255 bytes and uses RAND_add(3) to seed the
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OpenSSL built-in \s-1PRNG\s0. RAND_egd(path) is a wrapper for
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RAND_egd_bytes(path, 255);
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.PP
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\&\fIRAND_egd_bytes()\fR queries the entropy gathering daemon \s-1EGD\s0 on socket \fBpath\fR.
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It queries \fBbytes\fR bytes and uses RAND_add(3) to seed the
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OpenSSL built-in \s-1PRNG\s0.
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This function is more flexible than \fIRAND_egd()\fR.
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When only one secret key must
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be generated, it is not necessary to request the full amount 255 bytes from
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the \s-1EGD\s0 socket. This can be advantageous, since the amount of entropy
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that can be retrieved from \s-1EGD\s0 over time is limited.
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.SH "NOTES"
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.IX Header "NOTES"
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On systems without /dev/*random devices providing entropy from the kernel,
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the \s-1EGD\s0 entropy gathering daemon can be used to collect entropy. It provides
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a socket interface through which entropy can be gathered in chunks up to
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255 bytes. Several chunks can be queried during one connection.
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.PP
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\&\s-1EGD\s0 is available from http://www.lothar.com/tech/crypto/ (\f(CW\*(C`perl
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Makefile.PL; make; make install\*(C'\fR to install). It is run as \fBegd\fR
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\&\fIpath\fR, where \fIpath\fR is an absolute path designating a socket. When
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\&\fIRAND_egd()\fR is called with that path as an argument, it tries to read
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random bytes that \s-1EGD\s0 has collected. The read is performed in
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non-blocking mode.
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.PP
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Alternatively, the EGD-interface compatible daemon \s-1PRNGD\s0 can be used. It is
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available from
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http://www.aet.tu-cottbus.de/personen/jaenicke/postfix_tls/prngd.html .
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\&\s-1PRNGD\s0 does employ an internal \s-1PRNG\s0 itself and can therefore never run
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out of entropy.
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.SH "RETURN VALUE"
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.IX Header "RETURN VALUE"
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\&\fIRAND_egd()\fR and \fIRAND_egd_bytes()\fR return the number of bytes read from the
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daemon on success, and \-1 if the connection failed or the daemon did not
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return enough data to fully seed the \s-1PRNG\s0.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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rand(3), RAND_add(3),
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RAND_cleanup(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fIRAND_egd()\fR is available since OpenSSL 0.9.5.
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.PP
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\&\fIRAND_egd_bytes()\fR is available since OpenSSL 0.9.6.
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