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

As a quick fix, you could create a salt column in the database, and when a user logs in correctly matching the old hash, you can then use that password that they entered with a salt and create a new hash.