Crypt::DES_EDE3(3) User Contributed Perl Documentation Crypt::DES_EDE3(3)NAMECrypt::DES_EDE3 - Triple-DES EDE encryption/decryption
SYNOPSIS
use Crypt::DES_EDE3;
my $ede3 = Crypt::DES_EDE3->new($key);
$ede3->encrypt($block);
DESCRIPTIONCrypt::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).
LICENSECrypt::DES_EDE3 is free software; you may redistribute it and/or modify
it under the same terms as Perl itself.
AUTHOR & COPYRIGHTSCrypt::DES_EDE3 is Copyright 2001 Benjamin Trott, ben@rhumba.pair.com.
All rights reserved.
perl v5.14.1 2001-09-15 Crypt::DES_EDE3(3)
