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  1. PO
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    <p>Edit 2017/11/09: Be sure to take a look at the answer from O Jones.</p> <p>First off MD5 isn't the greatest hashing method you could use for this try sha256 or sha512</p> <p>That said lets use <code>hash('sha256')</code> instead of <code>md5()</code> to represent the hashing part of the process.</p> <p>When you first create a username and password you will hash the raw password with some salt (some random extra characters added to each password to make them longer/stronger).</p> <p>Might look something like this coming in from the create user form:</p> <pre><code>$escapedName = mysql_real_escape_string($_POST['name']); # use whatever escaping function your db requires this is very important. $escapedPW = mysql_real_escape_string($_POST['password']); # generate a random salt to use for this account $salt = bin2hex(mcrypt_create_iv(32, MCRYPT_DEV_URANDOM)); $saltedPW = $escapedPW . $salt; $hashedPW = hash('sha256', $saltedPW); $query = "insert into user (name, password, salt) values ('$escapedName', '$hashedPW', '$salt'); "; </code></pre> <p>Then on login it'll look something like this:</p> <pre><code>$escapedName = mysql_real_escape_string($_POST['name']); $escapedPW = mysql_real_escape_string($_POST['password']); $saltQuery = "select salt from user where name = '$escapedName';"; $result = mysql_query($saltQuery); # you'll want some error handling in production code :) # see http://php.net/manual/en/function.mysql-query.php Example #2 for the general error handling template $row = mysql_fetch_assoc($result); $salt = $row['salt']; $saltedPW = $escapedPW . $salt; $hashedPW = hash('sha256', $saltedPW); $query = "select * from user where name = '$escapedName' and password = '$hashedPW'; "; # if nonzero query return then successful login </code></pre>
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    1. POHow do I create and store md5 passwords in mysql
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    1. POHow do I create and store md5 passwords in mysql
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    1. COnote - you should not use the same salt for every password you intend to hash. It is better to use a unique (random) salt for each password
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      1. USJM4
    2. CO+1 for suggesting using something other than MD5.
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      1. USMichael Mior
    3. COWhy do you escape the password *before* it is hashed? I think you should escape the hashed password you want to inject in the database.
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      1. USMarcel Korpel
 

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