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I’m using SHA-512 to hash my passwords (with a salt ofcourse). I don’t think that what I want is possible, but let’s ask anyway.
Is there a way to check if a string is a SHA-512 (or another algorithm) hash already?
When a user logs in, I want to do a check on his password. If it’s still in plain text, it should get converted to a secure form.
Your task is extremely simple and require no strings checking.
Just compare entered password with stored one first.
If matched – here it is, a plain password. So, you can start conversion process.