3DES加密解密！TripleDES.class.php

Class TripleDES{ 
public static function Encrypt($key,$text){ 
$cipher = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_ECB, ''); 
srand((double)microtime() * 1000000); 
$size=mcrypt_enc_get_iv_size($cipher); 
$iv = mcrypt_create_iv($size, MCRYPT_RANDOM); 
if(mcrypt_generic_init($cipher, $key, $iv) != -1){ 
$cipherText = mcrypt_generic($cipher,$text); 
mcrypt_generic_deinit($cipher); 
return bin2hex($cipherText); 
} 
} 

public static function Decrypt($key,$encryptedText){ 
$cipherText=self::Hex2bin($encryptedText); 
$cipher = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_ECB, ''); 
srand((double)microtime() * 1000000); 
$size=mcrypt_enc_get_iv_size($cipher); 
$iv = mcrypt_create_iv($size, MCRYPT_RAND); 
if (mcrypt_generic_init($cipher, $key, $iv) != -1){ 
$decrypted_data = mdecrypt_generic($cipher,$cipherText); 
mcrypt_generic_deinit($cipher); 
return $decrypted_data; 
} 
} 
public static function Hex2bin($h){ 
if (!is_string($h)) return null; 
$r=''; 
for ($a=0; $a<strlen($h); $a+=2) { 
$r.=chr(hexdec($h{$a}.$h{($a+1)}));  
} 
return $r; 
} 
} 
?>