[Haskell-cafe] Storing passwords securely
jeremy at n-heptane.com
Sun Feb 6 04:54:30 CET 2011
Have you seen the PBKDF2 library?
Does that look like a reasonable way to store passwords securely?
On Feb 5, 2011, at 8:12 PM, Peter Scott wrote:
> The usual advice on how to store passwords securely is "use bcrypt",
> but since there seem to be no Haskell bindings for bcrypt, the other
> good option is to iterate a salted hash function at least 1000
> times. In order for people to get this right, there should be a
> library with a really simple API that makes it Just Work. I think I
> have such an API, but I'd like to hear if anybody else has
> suggestions before I go releasing it onto Hackage. The code is here:
> The part of the API that people have to care about is two functions.
> makePassword creates a hashed, salted password that you can store in
> a database. verifyPassword takes this hashed, salted password and a
> user's password input, and tells you if it matches. Like this:
> >>> makePassword (B.pack "hunter2") 12
> >>> verifyPassword (B.pack "wrong guess") passwordHash
> >>> verifyPassword (B.pack "hunter2") passwordHash
> There's also a function for increasing the number of hash iterations
> on stored password hashes, to compensate for Moore's law.
> Does this sound reasonable? Also, I have a pure-Haskell version and
> a version which depends on some C code, for speed (about 25x
> difference). Does anybody care about the pure Haskell version, or
> should I just drop it and require the faster C/Haskell mixed version?
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