用户注册的密码一般不会明文保存,总得加个密先。最简单的当然是在数据库sql语句中调用md5函数加密用户密码。这里介绍一个加解密类。如果你想在用户忘记密码时为他或她找回原来的密码,那么这个类是个好用的工具。当然,这个加解密类也可用于其他用途。
复制代码 代码如下:
class crypt {
private $skey;
public function __construct($key) {
$this->skey = hash("md5", $key, true); //32位skey
}
public function safe_b64encode($string) {
$data = base64_encode($string);
$data = str_replace(array('+', '/', '='), array('-', '_', ''), $data);
return $data;
}
public function safe_b64decode($string) {
$data = str_replace(array('-', '_'), array('+', '/'), $string);
$mod4 = strlen($data) % 4;
if ($mod4) {
$data .= substr('====', $mod4);
}
return base64_decode($data);
}
public function encode($value) {
if (!$value) {
return false;
}
$text = $value;
$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
$crypttext = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $this->skey, $text, MCRYPT_MODE_ECB, $iv);
return trim($this->safe_b64encode($crypttext));
}
public function decode($value) {
if (!$value) {
return false;
}
$crypttext = $this->safe_b64decode($value);
$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
$decrypttext = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $this->skey, $crypttext, MCRYPT_MODE_ECB, $iv);
return trim($decrypttext);
}
}

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