NAME

       Data::Entropy::RawSource::RandomOrg - download entropy from random.org

SYNOPSIS

               use Data::Entropy::RawSource::RandomOrg;

               my $rawsrc = Data::Entropy::RawSource::RandomOrg->new;

               $c = $rawsrc->getc;
               # and the rest of the I/O handle interface

DESCRIPTION

       This class provides an I/O handle connected to a stream of random octets being generated by an
       electromagnetic noise detector connected to the random.org server.  This is a strong source of random
       bits, but is not suitable for security applications because the bits are passed over the Internet
       unencrypted.  The handle implements a substantial subset of the interface described in IO::Handle.

       For use as a general entropy source, it is recommended to wrap an object of this class using
       "Data::Entropy::Source", which provides methods to extract entropy in more convenient forms than mere
       octets.

       The bits generated at random.org are, theoretically and as far as anyone can tell, totally unbiased and
       uncorrelated.  However, they are sent over the Internet in the clear, and so are subject to interception
       and alteration by an adversary.  This is therefore generally unsuitable for security applications.  The
       capacity of the random bit server is also limited.  This class will slow down requests if the server's
       entropy pool is less than half full, and (as requested by the server operators) pause entirely if the
       entropy pool is less than 20% full.

       Applications requiring secret entropy should generate it locally (see Data::Entropy::RawSource::Local).
       Applications requiring a large amount of entropy should generate it locally or download it from
       randomnumbers.info (see Data::Entropy::RawSource::RandomnumbersInfo).  Applications requiring a large
       amount of apparently-random data, but not true entropy, might prefer to fake it cryptographically (see
       Data::Entropy::RawSource::CryptCounter).

CONSTRUCTOR

       Data::Entropy::RawSource::RandomOrg->new
           Creates and returns a handle object referring to a stream of random octets generated by random.org.

METHODS

       A subset of the interfaces described in IO::Handle and IO::Seekable are provided:

       $rawsrc->read(BUFFER, LENGTH[, OFFSET])
       $rawsrc->getc
       $rawsrc->ungetc(ORD)
       $rawsrc->eof
           Buffered reading from the source, as in IO::Handle.

       $rawsrc->sysread(BUFFER, LENGTH[, OFFSET])
           Unbuffered reading from the source, as in IO::Handle.

       $rawsrc->close
           Does nothing.

       $rawsrc->opened
           Retruns true to indicate that the source is available for I/O.

       $rawsrc->clearerr
       $rawsrc->error
           Error handling, as in IO::Handle.

       The buffered ("read" et al) and unbuffered ("sysread" et al) sets of methods are interchangeable, because
       no such distinction is made by this class.

       Methods to write to the file are unimplemented because the stream is fundamentally read-only.  Methods to
       seek are unimplemented because the stream is non-rewindable; "ungetc" works, however.

SEE ALSO

       Data::Entropy::RawSource::CryptCounter, Data::Entropy::RawSource::Local,
       Data::Entropy::RawSource::RandomnumbersInfo, Data::Entropy::Source, <http://www.random.org>

AUTHOR

       Andrew Main (Zefram) <zefram@fysh.org>

COPYRIGHT

       Copyright (C) 2006, 2007, 2009, 2011 Andrew Main (Zefram) <zefram@fysh.org>

LICENSE

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl
       itself.