劉康民 > Crypt-DES_EEE3-0.01 > Crypt::DES_EEE3

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Module Version: 0.01   Source  

NAME ^

Crypt::DES_EEE3 - Triple-DES EEE encryption/decryption

SYNOPSIS ^

    use Crypt::DES_EEE3;
    my $ede3 = Crypt::DES_EEE3->new($key);
    $ede3->encrypt($block);

DESCRIPTION ^

Crypt::DES_EEE3 implements DES-EEE3 encryption. This is triple-DES encryption where an encrypt operation is encrypt-encrypt-encrypt, and decrypt is decrypt-decrypt-decrypt. This implementation uses Crypt::DES to do its dirty DES work, and simply provides a wrapper around that module: setting up the individual DES ciphers, initializing the keys, and performing the encryption/decryption steps.

DES-EEE3 encryption requires a key size of 24 bytes.

You're probably best off not using this module directly, as the encrypt and decrypt methods expect 8-octet blocks. You might want to use the module in conjunction with Crypt::CBC, for example. This would be DES-EEE3-CBC, or triple-DES in outer CBC mode.

USAGE ^

$ede3 = Crypt::DES_EEE3->new($key)

Creates a new Crypt::DES_EEE3 object (really, a collection of three DES ciphers), and initializes each cipher with part of $key, which should be at least 24 bytes. If it's longer than 24 bytes, the extra bytes will be ignored.

Returns the new object.

$ede3->encrypt($block)

Encrypts an 8-byte block of data $block using the three DES ciphers in an encrypt-decrypt-encrypt operation.

Returns the encrypted block.

$ede3->decrypt($block)

Decrypts an 8-byte block of data $block using the three DES ciphers in a decrypt-encrypt-decrypt operation.

Returns the decrypted block.

$ede3->blocksize

Returns the block size (8).

$ede3->keysize

Returns the key size (24).

LICENSE ^

Crypt::DES_EEE3 is free software; you may redistribute it and/or modify it under the same terms as Perl itself.

AUTHOR & COPYRIGHTS ^

Copyright 2003 by Kang-min Liu <gugod@gugod.org>.

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

See <http://www.perl.com/perl/misc/Artistic.html>

Thanks to the previous work of Crypt::DES_EDE3 by Benjamin Troot <ben@rhumba.pair.com>

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