NAME¶
Crypt::DES_EDE3 - Triple-DES EDE encryption/decryption
SYNOPSIS¶
use Crypt::DES_EDE3;
my $ede3 = Crypt::DES_EDE3->new($key);
$ede3->encrypt($block);
DESCRIPTION¶
Crypt::DES_EDE3 implements DES-EDE3 encryption. This is triple-DES
encryption where an encrypt operation is encrypt-decrypt-encrypt, and decrypt
is decrypt-encrypt-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-EDE3 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-EDE3-CBC, or triple-DES in outer CBC mode.
USAGE¶
$ede3 = Crypt::DES_EDE3->new($key)
Creates a new
Crypt::DES_EDE3 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_EDE3 is free software; you may redistribute it and/or modify it under
the same terms as Perl itself.
AUTHOR & COPYRIGHTS¶
Crypt::DES_EDE3 is Copyright 2001 Benjamin Trott, ben@rhumba.pair.com. All
rights reserved.