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;

}
}