crypt::random::source::base::handle(3pm) [debian man page]

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

NAME

       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

	 Yuval Kogman <nothingmuch@woobling.org>

COPYRIGHT AND LICENSE

       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)

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

NAME

       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, iroberts@cpan.com

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 v5.18.2							    2007-05-20								 Random(3)