mcryptphp

A. 如何用php做AES加密解密，編碼是UTF-8，跪謝求代碼

class CryptAES
{
protected $cipher = MCRYPT_RIJNDAEL_128;
protected $mode = MCRYPT_MODE_ECB;
protected $pad_method = NULL;
protected $secret_key = '';
protected $iv = '';

public function set_cipher($cipher)
{
$this->cipher = $cipher;
}

public function set_mode($mode)
{
$this->mode = $mode;
}

public function set_iv($iv)
{
$this->iv = $iv;
}

public function set_key($key)
{
$this->secret_key = $key;
}

public function require_pkcs5()
{
$this->pad_method = 'pkcs5';
}

protected function pad_or_unpad($str, $ext)
{
if ( is_null($this->pad_method) )
{
return $str;
}
else
{
$func_name = __CLASS__ . '::' . $this->pad_method . '_' . $ext . 'pad';
if ( is_callable($func_name) )
{
$size = mcrypt_get_block_size($this->cipher, $this->mode);
return call_user_func($func_name, $str, $size);
}
}
return $str;
}

protected function pad($str)
{
return $this->pad_or_unpad($str, '');
}

protected function unpad($str)
{
return $this->pad_or_unpad($str, 'un');
}

public function encrypt($str)
{
$str = $this->pad($str);
$td = mcrypt_mole_open($this->cipher, '', $this->mode, '');

if ( empty($this->iv) )
{
$iv = @mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
}
else
{
$iv = $this->iv;
}

mcrypt_generic_init($td, $this->secret_key, $iv);
$cyper_text = mcrypt_generic($td, $str);
$rt=base64_encode($cyper_text);
//$rt = bin2hex($cyper_text);
mcrypt_generic_deinit($td);
mcrypt_mole_close($td);

return $rt;
}

public function decrypt($str){
$td = mcrypt_mole_open($this->cipher, '', $this->mode, '');

if ( empty($this->iv) )
{
$iv = @mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
}
else
{
$iv = $this->iv;
}

mcrypt_generic_init($td, $this->secret_key, $iv);
//$decrypted_text = mdecrypt_generic($td, self::hex2bin($str));
$decrypted_text = mdecrypt_generic($td, base64_decode($str));
$rt = $decrypted_text;
mcrypt_generic_deinit($td);
mcrypt_mole_close($td);

return $this->unpad($rt);
}

public static function hex2bin($hexdata) {
$bindata = '';
$length = strlen($hexdata);
for ($i=0; $i< $length; $i += 2)
{
$bindata .= chr(hexdec(substr($hexdata, $i, 2)));
}
return $bindata;
}

public static function pkcs5_pad($text, $blocksize)
{
$pad = $blocksize - (@strlen($text) % $blocksize);
return $text . str_repeat(chr($pad), $pad);
}

public static function pkcs5_unpad($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);
}
}

/*$keyStr = 'UITN25LMUQC436IM';
$plainText = 'this is a string will be AES_Encrypt';

$aes = new CryptAES();
$aes->set_key($keyStr);
$aes->require_pkcs5();
$encText = $aes->encrypt($plainText);
$decString = $aes->decrypt($encText);

echo $encText,"n",$decString;*/