Compare user and pass hashes simultaneously to avoid leaking if the username is valid #23
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username is correct but not the password via a timing side channel.
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Currently the user and pass hashes are compared separately, if the username matches but not the password the middleware will return slightly faster than if both the username and password are wrong.
This change concatenates the user and pass hashes together and compares them in one call to
subtle.ConstantTimeCompareremoving any timing leaks.I also added a go.mod file.