# Crypt::Mode::ECB - phpMan

## NAME
    [Crypt::Mode::ECB] - Block cipher mode ECB [Electronic codebook]

## SYNOPSIS
       use [Crypt::Mode::ECB];
       my $m = [Crypt::Mode::ECB]->new('AES');

       #(en|de)crypt at once
       my $ciphertext = $m->encrypt($plaintext, $key);
       my $plaintext = $m->decrypt($ciphertext, $key);

       #encrypt more chunks
       $m->start_encrypt($key);
       my $ciphertext = $m->add('some data');
       $ciphertext .= $m->add('more data');
       $ciphertext .= $m->finish;

       #decrypt more chunks
       $m->start_decrypt($key);
       my $plaintext = $m->add($some_ciphertext);
       $plaintext .= $m->add($more_ciphertext);
       $plaintext .= $m->finish;

## DESCRIPTION
    This module implements ECB cipher mode. NOTE: it works only with ciphers
    from CryptX ([Crypt::Cipher::NNNN]). BEWARE: ECB is inherently insecure,
    if you are not sure go for [Crypt::Mode::CBC]!

## METHODS
  new
     my $m = [Crypt::Mode::ECB]->new($name);
     #or
     my $m = [Crypt::Mode::ECB]->new($name, $padding);
     #or
     my $m = [Crypt::Mode::ECB]->new($name, $padding, $cipher_rounds);

     # $name ....... one of 'AES', 'Anubis', 'Blowfish', 'CAST5', 'Camellia', 'DES', 'DES_EDE',
     #               'KASUMI', 'Khazad', 'MULTI2', 'Noekeon', 'RC2', 'RC5', 'RC6',
     #               'SAFERP', 'SAFER_K128', 'SAFER_K64', 'SAFER_SK128', 'SAFER_SK64',
     #               'SEED', 'Skipjack', 'Twofish', 'XTEA', 'IDEA', 'Serpent'
     #               simply any <NAME> for which there exists [Crypt::Cipher]::<NAME>
     # $padding .... 0 no padding (plaintext size has to be multiple of block length)
     #               1 PKCS5 padding, [Crypt::CBC]'s "standard" - DEFAULT
     #               2 [Crypt::CBC]'s "oneandzeroes"
     #               3 ANSI X.923 padding
     #               4 zero padding
     #               5 zero padding (+a block of zeros if the output length is divisible by the blocksize)
     # $cipher_rounds ... optional num of rounds for given cipher

  encrypt
       my $ciphertext = $m->encrypt($plaintext, $key);

  decrypt
       my $plaintext = $m->decrypt($ciphertext, $key);

  start_encrypt
       $m->start_encrypt($key);

  start_decrypt
       $m->start_decrypt($key);

  add
       # in encrypt mode
       my $plaintext = $m->add($ciphertext);

       # in decrypt mode
       my $ciphertext = $m->add($plaintext);

  finish
       #encrypt more chunks
       $m->start_encrypt($key);
       my $ciphertext = '';
       $ciphertext .= $m->add('some data');
       $ciphertext .= $m->add('more data');
       $ciphertext .= $m->finish;

       #decrypt more chunks
       $m->start_decrypt($key);
       my $plaintext = '';
       $plaintext .= $m->add($some_ciphertext);
       $plaintext .= $m->add($more_ciphertext);
       $plaintext .= $m->finish;

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

    *   [Crypt::Cipher::AES], [Crypt::Cipher::Blowfish], ...

    *   <<https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Electr>
        onic_codebook_.28ECB.29>