How would you add salt to your existing password hashes?

Question

I have a database of hashed passwords that had no salt added before they were hashed. I want to add salt to new passwords. Obviously I can\'t re-hash the existing ones.

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Answer 1

Create a new field in you're database named "salted" with a type of true/false (or whatever the equivalent is in your DBMS). Set all the values to false for the existing hashes. Whenever a new, salted, hash is added, set the "salted" field to true.

Then, all you have to do is handle the two types of hashes differently in your code.

This is more of a general solution than a specific one, but it should solve your problem.