---
name: "Crypt::DES_EDE3"
section: "3pm"
platform: "linux"
package: "libcrypt-des-ede3-perl"
version: "0.03-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Crypt::DES_EDE3"
---

# Crypt::DES\_EDE3(3pm)

Triple-DES EDE encryption/decryption

## 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.