在教程的基础上,使用salt实现一个基本的用户注册+登录系统。目前我在注册阶段使用这个:
define('SALT_LENGTH', 9);
function generateHash($plainText, $salt = null)
{
if ($salt === null)
{
$salt = substr(md5(uniqid(rand(), true)), 0, SALT_LENGTH);
}
else
{
$salt = substr($salt, 0, SALT_LENGTH);
}
return $salt . sha1($salt . $plainText);
}
$newpass = generateHash($_POST['newpass']);
followed by:
$sql = "INSERT INTO user SET
userid = '$_POST[newid]',
password = PASSWORD('$newpass'), ... etc"
这个很好用。
我现在要比较输入密码以检查是否相等(在单独的访问控制文件中):
define('SALT_LENGTH', 9);
function generateHash($plainText, $salt)
{
$salt = substr($salt, 0, SALT_LENGTH);
return $salt . sha1($salt . $plainText);
}
$sql = "SELECT password FROM user WHERE
userid = '$uid'";
$result = mysql_query($sql);
$row = mysql_fetch_row($result);
$comparepwd = generateHash($pwd, $row['password']);
if (mysql_num_rows($result) == 0 || $comparepwd != $row['password']) {
//access denied, unset session variables
}
INSERT INTO user SET
userid = '$_POST[newid]',
password = PASSWORD('$newpass')
密码('$newpass')会对MySQL产生进一步的影响吗?
