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Diffstat (limited to 'secure/lib/libcrypto/man/RAND_egd.3')
| -rw-r--r-- | secure/lib/libcrypto/man/RAND_egd.3 | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/secure/lib/libcrypto/man/RAND_egd.3 b/secure/lib/libcrypto/man/RAND_egd.3 new file mode 100644 index 0000000..1b8fdd3 --- /dev/null +++ b/secure/lib/libcrypto/man/RAND_egd.3 @@ -0,0 +1,201 @@ +.\" Automatically generated by Pod::Man version 1.15 +.\" Thu May 9 13:18:12 2002 +.\" +.\" Standard preamble: +.\" ====================================================================== +.de Sh \" Subsection heading +.br +.if t .Sp +.ne 5 +.PP +\fB\\$1\fR +.PP +.. +.de Sp \" Vertical space (when we can't use .PP) +.if t .sp .5v +.if n .sp +.. +.de Ip \" List item +.br +.ie \\n(.$>=3 .ne \\$3 +.el .ne 3 +.IP "\\$1" \\$2 +.. +.de Vb \" Begin verbatim text +.ft CW +.nf +.ne \\$1 +.. +.de Ve \" End verbatim text +.ft R + +.fi +.. +.\" Set up some character translations and predefined strings. \*(-- will +.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left +.\" double quote, and \*(R" will give a right double quote. | will give a +.\" real vertical bar. \*(C+ will give a nicer C++. Capital omega is used +.\" to do unbreakable dashes and therefore won't be available. \*(C` and +.\" \*(C' expand to `' in nroff, nothing in troff, for use with C<> +.tr \(*W-|\(bv\*(Tr +.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' +.ie n \{\ +. ds -- \(*W- +. ds PI pi +. if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch +. if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch +. ds L" "" +. ds R" "" +. ds C` "" +. ds C' "" +'br\} +.el\{\ +. ds -- \|\(em\| +. ds PI \(*p +. ds L" `` +. ds R" '' +'br\} +.\" +.\" If the F register is turned on, we'll generate index entries on stderr +.\" for titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and +.\" index entries marked with X<> in POD. Of course, you'll have to process +.\" the output yourself in some meaningful fashion. +.if \nF \{\ +. de IX +. tm Index:\\$1\t\\n%\t"\\$2" +.. +. nr % 0 +. rr F +.\} +.\" +.\" For nroff, turn off justification. 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RAND_egd(path) is a wrapper for +RAND_egd_bytes(path, 255); +.PP +\&\fIRAND_egd_bytes()\fR queries the entropy gathering daemon \s-1EGD\s0 on socket \fBpath\fR. +It queries \fBbytes\fR bytes and uses RAND_add(3) to seed the +OpenSSL built-in \s-1PRNG\s0. +This function is more flexible than \fIRAND_egd()\fR. +When only one secret key must +be generated, it is not necessary to request the full amount 255 bytes from +the \s-1EGD\s0 socket. This can be advantageous, since the amount of entropy +that can be retrieved from \s-1EGD\s0 over time is limited. +.SH "NOTES" +.IX Header "NOTES" +On systems without /dev/*random devices providing entropy from the kernel, +the \s-1EGD\s0 entropy gathering daemon can be used to collect entropy. It provides +a socket interface through which entropy can be gathered in chunks up to +255 bytes. Several chunks can be queried during one connection. +.PP +\&\s-1EGD\s0 is available from http://www.lothar.com/tech/crypto/ (\f(CW\*(C`perl +Makefile.PL; make; make install\*(C'\fR to install). It is run as \fBegd\fR +\&\fIpath\fR, where \fIpath\fR is an absolute path designating a socket. When +\&\fIRAND_egd()\fR is called with that path as an argument, it tries to read +random bytes that \s-1EGD\s0 has collected. The read is performed in +non-blocking mode. +.PP +Alternatively, the EGD-interface compatible daemon \s-1PRNGD\s0 can be used. It is +available from +http://www.aet.tu-cottbus.de/personen/jaenicke/postfix_tls/prngd.html . +\&\s-1PRNGD\s0 does employ an internal \s-1PRNG\s0 itself and can therefore never run +out of entropy. +.SH "RETURN VALUE" +.IX Header "RETURN VALUE" +\&\fIRAND_egd()\fR and \fIRAND_egd_bytes()\fR return the number of bytes read from the +daemon on success, and \-1 if the connection failed or the daemon did not +return enough data to fully seed the \s-1PRNG\s0. +.SH "SEE ALSO" +.IX Header "SEE ALSO" +rand(3), RAND_add(3), +RAND_cleanup(3) +.SH "HISTORY" +.IX Header "HISTORY" +\&\fIRAND_egd()\fR is available since OpenSSL 0.9.5. +.PP +\&\fIRAND_egd_bytes()\fR is available since OpenSSL 0.9.6. |
