# Crypt::Cipher::DES - phpMan

## NAME
    [Crypt::Cipher::DES] - Symmetric cipher DES, key size: 64[56] bits

## SYNOPSIS
      ### example 1
      use [Crypt::Mode::CBC];

      my $key = '...'; # length has to be valid key size for this cipher
      my $iv = '...';  # 16 bytes
      my $cbc = [Crypt::Mode::CBC]->new('DES');
      my $ciphertext = $cbc->encrypt("secret data", $key, $iv);

      ### example 2 (slower)
      use [Crypt::CBC];
      use [Crypt::Cipher::DES];

      my $key = '...'; # length has to be valid key size for this cipher
      my $iv = '...';  # 16 bytes
      my $cbc = [Crypt::CBC]->new( -cipher=>'[Cipher::DES]', -key=>$key, -iv=>$iv );
      my $ciphertext = $cbc->encrypt("secret data");

## DESCRIPTION
    This module implements the DES cipher. Provided interface is compliant
    with [Crypt::CBC] module.

    BEWARE: This module implements just elementary
    "one-block-(en|de)cryption" operation - if you want to encrypt/decrypt
    generic data you have to use some of the cipher block modes - check for
    example [Crypt::Mode::CBC], [Crypt::Mode::CTR] or [Crypt::CBC] (which will be
    slower).

## METHODS
  new
     $c = [Crypt::Cipher::DES]->new($key);
     #or
     $c = [Crypt::Cipher::DES]->new($key, $rounds);

  encrypt
     $ciphertext = $c->encrypt($plaintext);

  decrypt
     $plaintext = $c->decrypt($ciphertext);

  keysize
      $c->keysize;
      #or
      [Crypt::Cipher::DES]->keysize;
      #or
      [Crypt::Cipher::DES::keysize];

  blocksize
      $c->blocksize;
      #or
      [Crypt::Cipher::DES]->blocksize;
      #or
      [Crypt::Cipher::DES::blocksize];

  max_keysize
      $c->max_keysize;
      #or
      [Crypt::Cipher::DES]->max_keysize;
      #or
      [Crypt::Cipher::DES::max_keysize];

  min_keysize
      $c->min_keysize;
      #or
      [Crypt::Cipher::DES]->min_keysize;
      #or
      [Crypt::Cipher::DES::min_keysize];

  default_rounds
      $c->default_rounds;
      #or
      [Crypt::Cipher::DES]->default_rounds;
      #or
      [Crypt::Cipher::DES::default_rounds];

## SEE ALSO
    *   CryptX, [Crypt::Cipher]

    *   <<https://en.wikipedia.org/wiki/Data_Encryption_Standard>>