How do I encrypt this password with MD5 using PHP? - php

Question

The code below is from a login script, written in PHP. The database that it checks passwords against encrypts the passwords using MD5 however when the login script checks against the database for a password, it is checking the raw password without encryption. I am familiar with the md5() function but how would I incorporate that into the following:
<?php
session_start();
$username = $_POST['username'];
$password = $_POST['password'];
if ($username && $password) {
$connect = mysql_connect("host", "user", "password") or die("Couldn't connect");
mysql_select_db("dbname") or die("Couldn't find the database");
$query = mysql_query("SELECT * FROM users WHERE username='$username'");
$numrows = mysql_num_rows($query);
if ($numrows != 0) {
while ($row = mysql_fetch_assoc($query)) {
$dbusername = $row['username'];
$dbpassword = $row['password'];
}
if ($username == $dbusername && $password == $dbpassword) {
echo "You're in! Click <a href='../member.php'>here</a> to enter the member page.";
$_SESSION['username'] = $username;
}else{
echo "Incorrect password";
}
}else{
die("That username does not exist.");
}
}else{
die("Please enter a valid username and password.");
}
?>

Answer 1

You should be checking and querying the database for a match, not bringing the results down and checking them locally. With that said:
$password = md5($_POST['password']);
Then also change:
SELECT * FROM users WHERE username='$username' AND password='$password'
But I'd also have a look at using PDO instead of placing the values directly in a SQL query. At the very least you should be using mysql_real_escape_string to avoid injection attacks.

Answer 2

$salt=sha1($postpassword);
$arr= strlen($postpassword);
$count=ceil($arr/2);
$stringarr=str_split($postpassword,$count);
$password1=hash("sha512", $stringarr['0']);
$password2=$salt . ( hash( 'whirlpool', $salt . $stringarr['1'] ) );
return $password1.$password2;