[Haskell-cafe] Storing passwords securely

Jeremy Shaw 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?

- jeremy

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:
> https://github.com/PeterScott/pwstore
> 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
>     "sha256|12|lMzlNz0XK9eiPIYPY96QCQ==|1ZJ/ 
>     >>> verifyPassword (B.pack "wrong guess") passwordHash
>     False
>     >>> verifyPassword (B.pack "hunter2") passwordHash
>     True
> 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?
> Thanks,
> -Peter
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