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.\" ========================================================================
.\"
.IX Title "Random 3pm"
.TH Random 3pm "2007-05-20" "perl v5.14.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
Crypt::OpenSSL::RSA \- RSA encoding and decoding, using the openSSL libraries
.PP
Crypt::OpenSSL::Random \- Routines for accessing the OpenSSL
pseudo\-random number generator
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  use Crypt::OpenSSL::Random;
\&
\&  Crypt::OpenSSL::Random::random_seed($good_random_data);
\&  Crypt::OpenSSL::Random::random_egd("/tmp/entropy");
\&  Crypt::OpenSSL::Random::random_status() or
\&    die "Unable to sufficiently seed the random number generator".
\&
\&  my $ten_good_random_bytes = Crypt::OpenSSL::Random::random_bytes(10);
\&  my $ten_ok_random_bytes = Crypt::OpenSSL::Random::random_pseudo_bytes(10);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Crypt::OpenSSL::Random provides the ability to seed and query the
OpenSSL library's pseudo-random number generator
.SS "\s-1EXPORT\s0"
.IX Subsection "EXPORT"
None by default.
.SH "Static Methods"
.IX Header "Static Methods"
.IP "random_bytes" 4
.IX Item "random_bytes"
This function, returns a specified number of cryptographically strong
pseudo-random bytes from the \s-1PRNG\s0.  If the \s-1PRNG\s0 has not been seeded
with enough randomness to ensure an unpredictable byte sequence, then
a false value is returned.
.IP "random_pseudo_bytes" 4
.IX Item "random_pseudo_bytes"
This function, is similar to c<random_bytes>, but the resulting
sequence of bytes are not necessarily unpredictable.  They can be used
for non-cryptographic purposes and for certain purposes in
cryptographic protocols, but usually not for key generation etc.
.IP "random_seed" 4
.IX Item "random_seed"
This function seeds the \s-1PRNG\s0 with a supplied string of bytes.  It
returns true if the \s-1PRNG\s0 has sufficient seeding.  Note: calling this
function with non-random bytes is of limited value at best!
.IP "random_egd" 4
.IX Item "random_egd"
This function seeds the \s-1PRNG\s0 with data from the specified entropy
gathering daemon.  Returns the number of bytes read from the daemon on
succes, or \-1 if not enough bytes were read, or if the connection to
the daemon failed.
.IP "random_status" 4
.IX Item "random_status"
This function returns true if the \s-1PRNG\s0 has sufficient seeding.
.SH "BUGS"
.IX Header "BUGS"
Because of the internal workings of OpenSSL's random library, the
pseudo-random number generator (\s-1PRNG\s0) accessed by
Crypt::OpenSSL::Random will be different than the one accessed by any
other perl module.  Hence, to use a module such as
Crypt::OpenSSL::Random, you will need to seed the \s-1PRNG\s0 used there from
one used here.  This class is still advantageous, however, as it
centralizes other methods, such as random_egd, in one place.
.SH "AUTHOR"
.IX Header "AUTHOR"
Ian Robertson, iroberts@cpan.com
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIperl\fR\|(1), \fIrand\fR\|(3), \fIRAND_add\fR\|(3), \fIRAND_egd\fR\|(3), \fIRAND_bytes\fR\|(3).
.SH "POD ERRORS"
.IX Header "POD ERRORS"
Hey! \fBThe above document had some coding errors, which are explained below:\fR
.IP "Around line 62:" 4
.IX Item "Around line 62:"
\&'=item' outside of any '=over'
.IP "Around line 93:" 4
.IX Item "Around line 93:"
You forgot a '=back' before '=head1'