_php technique of DES encryption and decryption instance code implemented by PHP

This example describes the DES encryption and decryption instance implemented by PHP. Share to everyone for your reference, specific as follows:

<?php $key = ' very important data ';
  function Jiami ($key, $STR) {/* Open module, and create IV */$td = Mcrypt_module_open (' des ', ', ', ' ECB ', ');
  $TD = Mcrypt_module_open (Mcrypt_des, ', MCRYPT_MODE_CBC, ');
  $TD = Mcrypt_module_open (' des ', ', ', ' CBC ', ');
  $key = substr ($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, $iv) = = 1) {return FALSE;
  }/* Encrypt data */$c _t = Mcrypt_generic ($TD, $STR);
  /* Clean up */mcrypt_generic_deinit ($TD);
  Mcrypt_module_close ($TD);
return $c _t;
  function Jiemi ($key, $STR) {/* Open module, and create IV */$td = Mcrypt_module_open (' des ', ', ', ' ECB ', ');
  $TD = Mcrypt_module_open (Mcrypt_des, ', MCRYPT_MODE_CBC, ');
  $TD = Mcrypt_module_open (' des ', ', ', ' CBC ', ');
  $key = substr ($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, $iv) = = 1) {return FALSE;
  }/* Reinitialize buffers for decryption */$p _t = Mdecrypt_generic ($TD, $STR);
  /* Clean up */mcrypt_generic_deinit ($TD);
  Mcrypt_module_close ($TD);
Return trim ($p _t);
} $str = ' Hello world! '; Echo ' key: '. $key.
' <br> '; echo ' str: '. $str.
' <br> ';
$jiami = Jiami ($key, $STR); Echo ' Encrypt: '. $jiami.
' <br> ';
File_put_contents (' Jiamiqian.txt ', $str);
File_put_contents (' Jiamihou.txt ', $jiami);
$jiemi = Jiemi ($key, $jiami); Echo ' Decrypt: '. $jiemi.

 ' <br> ';

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