BSD-3-Clause licensed and maintained by Thomas DuBuisson

Module documentation for 0.4.1.4

This version can be pinned in stack with:entropy-0.4.1.4@sha256:c42017a9e0831e60282c94549e4a05344aadb36e18445b82bdb17048f0dd3c41,2742

Introduction

This package allows Haskell users to easily acquire entropy for use in critical security applications by calling out to either windows crypto api, unix/linux’s /dev/urandom. Hardware RNGs (currently RDRAND, patches welcome) are supported via the hardwareRNG function.

If you wish to obtain an XOR of the hardware and system RNG consider:

import           Data.Bits (xor)
import qualified Data.ByteString as B
import qualified Control.Exception as X

xorRNG sz = do hw  <- hardwareRNG sz
               h   <- openHandle
               sys <- hGetEntropy h `X.finally` closeHandle h
               pure $ B.pack $ B.zipWith xor hw sys

This package supports Windows, {li,u}nix, QNX, and has preliminary support for HaLVM.

Typically tested on Linux and OSX - testers are as welcome as patches.

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