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crypt::openssl::random(3) [centos man page]

Random(3)						User Contributed Perl Documentation						 Random(3)

Crypt::OpenSSL::RSA - RSA encoding and decoding, using the openSSL libraries Crypt::OpenSSL::Random - Routines for accessing the OpenSSL pseudo-random number generator SYNOPSIS
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); DESCRIPTION
Crypt::OpenSSL::Random provides the ability to seed and query the OpenSSL library's pseudo-random number generator EXPORT None by default. Static Methods random_bytes This function, returns a specified number of cryptographically strong pseudo-random bytes from the PRNG. If the PRNG has not been seeded with enough randomness to ensure an unpredictable byte sequence, then a false value is returned. 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. random_seed This function seeds the PRNG with a supplied string of bytes. It returns true if the PRNG has sufficient seeding. Note: calling this function with non-random bytes is of limited value at best! random_egd This function seeds the PRNG 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. random_status This function returns true if the PRNG has sufficient seeding. BUGS
Because of the internal workings of OpenSSL's random library, the pseudo-random number generator (PRNG) 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 PRNG used there from one used here. This class is still advantageous, however, as it centralizes other methods, such as random_egd, in one place. AUTHOR
Ian Robertson, SEE ALSO
perl(1), rand(3), RAND_add(3), RAND_egd(3), RAND_bytes(3). POD ERRORS
Hey! The above document had some coding errors, which are explained below: Around line 62: '=item' outside of any '=over' Around line 93: You forgot a '=back' before '=head1' perl v5.16.3 2007-05-20 Random(3)

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Crypt::Random::Source::Base::Handle(3pm)		User Contributed Perl Documentation		  Crypt::Random::Source::Base::Handle(3pm)

Crypt::Random::Source::Base::Handle - IO::Handle based random data sources SYNOPSIS
use Moose; extends qw(Crypt::Random::Source::Base::Handle); sub open_handle { # invoked as needed } # this class can also be used directly Crypt::Random::Source::Base::Handle->new( handle => $file_handle ); # it supports some standard methods: $p->blocking(0); $p->read( my $buf, $n ); # no error handling here DESCRIPTION
This is a concrete base class for all IO::Handle based random data sources. It implements error handling ATTRIBUTES
handle An IO::Handle or file handle to read from. blocking This is actually handled by "handle", and is documented in IO::Handle. allow_under_read Whether or not under reading is considered an error. Defaults to false. reread_attempts The number of attempts to make at rereading if the handle did not provide enough bytes on the first attempt. Defaults to 1. Only used if "allow_under_read" is enabled. METHODS
get See "get" in Crypt::Random::Source::Base. When "blocking" or "allow_under_read" are set to a true value this method may return fewer bytes than requested. read This delegates directly to "handle". It DOES NOT provide the same validation as "get" would have, so no checking for underreads is done. close Close the handle and clear it. _read "$self->handle->read" but with additional error checking and different calling conventions. _read_too_short Called by "_read" when not enough data was read from the handle. Normally it will either die with an error or attempt to reread. When "allow_under_read" is true it will just return the partial buffer. open_handle Abstract method, should return an IO::Handle to use. AUTHOR
This software is copyright (c) 2011 by Yuval Kogman. This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself. perl v5.14.2 2011-01-05 Crypt::Random::Source::Base::Handle(3pm)
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