PHP AES双向加密解密(128位)

	/**

	 用法：

	 Security::encrypt($str,$key);

	 Security::decrypt($str,$key);

	 */

	class Security {

	    public static function encrypt($input, $key) {

	        $size = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB);

	        $input = Security::pkcs5_pad($input, $size);

	        $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_ECB, '');

	        $iv = mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);

	        mcrypt_generic_init($td, $key, $iv);

	        $data = mcrypt_generic($td, $input);

	        mcrypt_generic_deinit($td);

	        mcrypt_module_close($td);

	        $data = base64_encode($data);

	        return $data;

	    }

	  

	    private static function pkcs5_pad ($text, $blocksize) {

	        $pad = $blocksize - (strlen($text) % $blocksize);

	        return $text . str_repeat(chr($pad), $pad);

	    }

	  

	    public static function decrypt($sStr, $sKey) {

	        $decrypted= mcrypt_decrypt(

	            MCRYPT_RIJNDAEL_128,

	            $sKey,

	            base64_decode($sStr),

	            MCRYPT_MODE_ECB

	        );

	        $dec_s = strlen($decrypted);

	        $padding = ord($decrypted[$dec_s-1]);

	        $decrypted = substr($decrypted, 0, -$padding);

	        return $decrypted;

	    }
	}	/**

	 用法：

	 Security::encrypt($str,$key);