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Manual Reference Pages  - BubbleBabble (3)

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Digest::BubbleBabble - Create bubble-babble fingerprints

CONTENTS

    use Digest::BubbleBabble qw( bubblebabble );
    use Digest::SHA1 qw( sha1 );

    my $fingerprint = bubblebabble( Digest => sha1($message) );

Digest::BubbleBabble takes a message digest (generated by either of the MD5 or SHA-1 message digest algorithms) and creates a fingerprint of that digest in bubble babble format. Bubble babble is a method of representing a message digest as a string of real words, to make the fingerprint easier to remember. The words are not necessarily real words, but they look more like words than a string of hex characters.

Bubble babble fingerprinting is used by the SSH2 suite (and, consequently, by Net::SSH::Perl, the Perl SSH implementation) to display easy-to-remember key fingerprints. The key (a DSA or RSA key) is converted into a textual form, digested using Digest::SHA1, and run through bubblebabble to create the key fingerprint.

Digest::BubbleBabble conditionally exports one function called bubblebabble; to import the function you must choose to import it, like this:

    use Digest::BubbleBabble qw( bubblebabble );

Currently takes only one pair of arguments, the key of which must be Digest, the value of which is the actual message digest $digest. You should generate this message digest yourself using either Digest::MD5 of Digest::SHA1.

Returns the bubble babble form of the digest.

Benjamin Trott, ben@rhumba.pair.com

Except where otherwise noted, Digest::BubbleBabble is Copyright 2001 Benjamin Trott. All rights reserved. Digest::BubbleBabble is free software; you may redistribute it and/or modify it under the same terms as Perl itself.

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