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('AES');
 #or
 my $m = Crypt::Mode::ECB->new('AES', $padding);
 #or
 my $m = Crypt::Mode::ECB->new('AES', $padding, $cipher_rounds);

 # $padding .... 0 no padding (plaintext size has to be myltiple of block length)
 #               1 PKCS5 padding, Crypt::CBC's "standard" - DEFAULT
 #               2 Crypt::CBC's "oneandzeroes"
 # $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

See example below "finish".

start_decrypt

See example below "finish".

add

See example below "finish".

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#Electronic_codebook_.28ECB.29