PHP5.5および5.6と互換性のある暗号化および復号化関数またはクラスを探しています

<?phpclass DES{ var $key; var $iv; //偏移量  function DES( $key, $iv=0 ) { //key长度8例如:1234abcd  $this->key = $key;  if( $iv == 0 ) {   $this->iv = $key;  } else {   $this->iv = $iv; //mcrypt_create_iv ( mcrypt_get_block_size (MCRYPT_DES, MCRYPT_MODE_CBC), MCRYPT_DEV_RANDOM );  } }  function encrypt($str) { //加密，返回大写十六进制字符串  $size = mcrypt_get_block_size ( MCRYPT_DES, MCRYPT_MODE_CBC );  $str = $this->pkcs5Pad ( $str, $size );  return strtoupper( bin2hex( mcrypt_cbc(MCRYPT_DES, $this->key, $str, MCRYPT_ENCRYPT, $this->iv ) ) ); }  function decrypt($str) { //解密  $strBin = $this->hex2bin( strtolower( $str ) );  $str = mcrypt_cbc( MCRYPT_DES, $this->key, $strBin, MCRYPT_DECRYPT, $this->iv );  $str = $this->pkcs5Unpad( $str );  return $str; }  function hex2bin($hexData) {  $binData = "";  for($i = 0; $i < strlen ( $hexData ); $i += 2) {   $binData .= chr ( hexdec ( substr ( $hexData, $i, 2 ) ) );  }  return $binData; }  function pkcs5Pad($text, $blocksize) {  $pad = $blocksize - (strlen ( $text ) % $blocksize);  return $text . str_repeat ( chr ( $pad ), $pad ); }  function pkcs5Unpad($text) {  $pad = ord ( $text {strlen ( $text ) - 1} );  if ($pad > strlen ( $text ))   return false;  if (strspn ( $text, chr ( $pad ), strlen ( $text ) - $pad ) != $pad)   return false;  return substr ( $text, 0, - 1 * $pad ); }}$my_encrypt = new DES('qwertyuiop');echo $my_encrypt->encrypt('1234567');

function encrypt($str, $key)  {      $block = mcrypt_get_block_size('des', 'ecb');      $pad = $block - (strlen($str) % $block);      $str .= str_repeat(chr($pad), $pad);      return mcrypt_encrypt(MCRYPT_DES, $key, $str, MCRYPT_MODE_ECB);}function decrypt($str, $key)  {        $str = mcrypt_decrypt(MCRYPT_DES, $key, $str, MCRYPT_MODE_ECB);      $block = mcrypt_get_block_size('des', 'ecb');      $pad = ord($str[($len = strlen($str)) - 1]);      return substr($str, 0, strlen($str) - $pad);  }