PHP下简单的AES加解密算法使用及例子（256位）

class aes {

// CRYPTO_CIPHER_BLOCK_SIZE 32

private $_secret_key = 'default_secret_key';

public function setKey($key) {

$this->_secret_key = $key;

}

public function encode($data) {

$td = mcrypt_module_open(MCRYPT_RIJNDAEL_256,'',MCRYPT_MODE_CBC,'');

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

mcrypt_generic_init($td,$this->_secret_key,$iv);

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

mcrypt_generic_deinit($td);

return $iv . $encrypted;

}

public function decode($data) {

$td = mcrypt_module_open(MCRYPT_RIJNDAEL_256,'',MCRYPT_MODE_CBC,'');

$iv = mb_substr($data,0,32,'latin1');

mcrypt_generic_init($td,$this->_secret_key,$iv);

$data = mb_substr($data,32,mb_strlen($data,'latin1'),'latin1');

$data = mdecrypt_generic($td,$data);

mcrypt_generic_deinit($td);

mcrypt_module_close($td);

return trim($data);

}

}

$aes = new aes();

$aes->setKey('key');

// 加密

$aes->encode('string');

// 解密

$aes->decode($string);

?>