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NAME

Crypt::AppleTwoFish -- an Apple iTMS internal key descrambling algorithm

LANGUAGE

Pure Perl.

DESCRIPTION

This code appears to have only cursory resemblance to Bruce Schneier's 
blowfish and twofish algorithms in that it too has a table-based decoder.

Derivation from FairKeys code by Jon Lech Johanson at nanocrew.net. 
If you don't know what that is, don't bother looking here further. This is
a Pure Perl implementation. I doubt there is any need for xs coding for 
what would mainly be processing 16 bytes at a time. This code is part of an 
ongoing effort to clone portions of the Apple iTMS in Perl for portability. 
See www.hymn-project.org for prior efforts by others.

To install the module...

lib/Crypt/AppleTwoFish.pm  view on Meta::CPAN

        129, 189, 99,  114,
    ],
);

=head1 NAME

Crypt::AppleTwoFish -- two Apple iTMS/iTunes key descrambling algorithms

=head1 DESCRIPTION

The first algorithm appears to have only cursory resemblance to Bruce Schneier's 
blowfish and twofish algorithms in that it too has a table-based decoder.

The second algorithm is more standard encryption using S-box type permutations
and lookup tables, and might have started out something like Twofish or Blowfish.

=head1 SYNOPSIS

    for iTMS usages:

    use Crypt::AppleTwoFish;