Data::Entropy::RawSource::RandomOrg(3pm)

1Data::Entropy::RawSourcUes:e:rRaCnodnotmrOirbgu(t3e)d PeDraltaD:o:cEunmternotpayt:i:oRnawSource::RandomOrg(3)
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NAME

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

9               use Data::Entropy::RawSource::RandomOrg;
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11               my $rawsrc = Data::Entropy::RawSource::RandomOrg->new;
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13               $c = $rawsrc->getc;
14               # and the rest of the I/O handle interface
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DESCRIPTION

17       This class provides an I/O handle connected to a stream of random
18       octets being generated by an electromagnetic noise detector connected
19       to the random.org server.  This is a strong source of random bits, but
20       is not suitable for security applications because the bits are passed
21       over the Internet unencrypted.  The handle implements a substantial
22       subset of the interface described in IO::Handle.
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24       For use as a general entropy source, it is recommended to wrap an
25       object of this class using "Data::Entropy::Source", which provides
26       methods to extract entropy in more convenient forms than mere octets.
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28       The bits generated at random.org are, theoretically and as far as
29       anyone can tell, totally unbiased and uncorrelated.  However, they are
30       sent over the Internet in the clear, and so are subject to interception
31       and alteration by an adversary.  This is therefore generally unsuitable
32       for security applications.  The capacity of the random bit server is
33       also limited.  This class will slow down requests if the server's
34       entropy pool is less than half full, and (as requested by the server
35       operators) pause entirely if the entropy pool is less than 20% full.
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37       Applications requiring secret entropy should generate it locally (see
38       Data::Entropy::RawSource::Local).  Applications requiring a large
39       amount of entropy should generate it locally or download it from
40       randomnumbers.info (see Data::Entropy::RawSource::RandomnumbersInfo).
41       Applications requiring a large amount of apparently-random data, but
42       not true entropy, might prefer to fake it cryptographically (see
43       Data::Entropy::RawSource::CryptCounter).
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CONSTRUCTOR

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

51       A subset of the interfaces described in IO::Handle and IO::Seekable are
52       provided:
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54       $rawsrc->read(BUFFER, LENGTH[, OFFSET])
55       $rawsrc->getc
56       $rawsrc->ungetc(ORD)
57       $rawsrc->eof
58           Buffered reading from the source, as in IO::Handle.
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60       $rawsrc->sysread(BUFFER, LENGTH[, OFFSET])
61           Unbuffered reading from the source, as in IO::Handle.
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63       $rawsrc->close
64           Does nothing.
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66       $rawsrc->opened
67           Retruns true to indicate that the source is available for I/O.
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69       $rawsrc->clearerr
70       $rawsrc->error
71           Error handling, as in IO::Handle.
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73       The buffered ("read" et al) and unbuffered ("sysread" et al) sets of
74       methods are interchangeable, because no such distinction is made by
75       this class.
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77       Methods to write to the file are unimplemented because the stream is
78       fundamentally read-only.  Methods to seek are unimplemented because the
79       stream is non-rewindable; "ungetc" works, however.
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AUTHOR

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

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

95       This module is free software; you can redistribute it and/or modify it
96       under the same terms as Perl itself.
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100perl v5.34.0                      2021-07D-a2t2a::Entropy::RawSource::RandomOrg(3)