[PHP] mcrypt not fully decrypting?

[Tyler Longren]

Hi,

I'm going to start encrypting credit cards with the mcrypt functions.  I
encrypted the credit cards like so:
$key = 'test';
  $cc = "1234567890123456";
  $td = mcrypt_module_open ('tripledes', '', 'ecb', '');
  $key = substr ($key, 0, mcrypt_enc_get_key_size ($td));
  $iv_size = mcrypt_enc_get_iv_size ($td);
  $iv = mcrypt_create_iv ($iv_size, MCRYPT_RAND);

  // Initialize encryption handle
  if (mcrypt_generic_init ($td, $key, $iv) != -1) {
   // Encrypt data
   $ciphertext = mcrypt_generic ($td, $cc);
   mcrypt_generic_deinit ($td);

   // Reinitialize buffers for decryption
   mcrypt_generic_init ($td, $key, $iv);
   $plaintext = mdecrypt_generic ($td, $ciphertext);

   // Clean up
   mcrypt_generic_deinit ($td);
   mcrypt_module_close ($td);
    print "<font face=Arial size=2><b>Ciphertext:</b> $ciphertext<Br>";
     print "<b>Plaintext:</b> $plaintext</font>";
  }

Sometimes, when I decrypt a cc it contains binary data...it's not fully
decrypted.  There's some plaintext in it and there's also binary.  Does
anyone know why this happens or how I can fix it?

Thanks,
Tyler


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