Crypto.Scrypt

Contents

Description

Scrypt is a sequential memory-hard key derivation function. This module provides bindings to a fast C implementation of scrypt, written by Colin Percival. See http://www.tarsnap.com/scrypt.html for more information on scrypt.

Synopsis

Parameters to the `scrypt` function

data ScryptParams Source

Encapsulates the three tuning parameters to the scrypt function: N, r and p. The parameters affect running time and memory usage:

Memory usage is approximately 128*r*N bytes. Note that the params function takes log_2(N) as a parameter. As an example, the defaultParams

   log_2(N) = 14, r = 8, and p = 1

lead to scrypt using 128 * 8 * 2^14 = 16M bytes of memory.

Running time is proportional to all of N, r and p. However p only as an insignificant influence on memory usage an can thus be used to tune the running time of scrypt.

params Source

Arguments

:: Integer	`log_2(N)`. Scrypt's `N` parameter must be a power of two greater than one, thus it's logarithm to base two must be greater than zero.
-> Integer	The parameter `r`, an integer greater than zero.
-> Integer	The parameter `p`, an integer greater than zero. `r` and `p` must satisfy `r * p < 2^30`.
-> Maybe ScryptParams	Returns `Just` the parameter object for valid arguments, otherwise `Nothing`.