Saltine 0.2.1.0
A Haskell binding for @jedisct1’s portable binding for djb’s
NaCl. This is an early release. Please try it out, but don’t just
yet stake your life or job on it.
It is imperative you call sodiumInit
before using any other function.
import Crypto.Saltine
import Crypto.Saltine.Core.SecretBox
import qualified Data.ByteString.Char8 as BSC8
main = do
sodiumInit
k <- newKey
n <- newNonce
let ciphertext = secretbox k n (BSC8.pack "foobar")
print $ secretboxOpen k n ciphertext
-- Just "foobar"
In
The Security Impact of a New Cryptographic Library
Bernstein, Lange, and Schwabe argue that high-level cryptographic
libraries eliminate whole spaces of cryptographic disasters which are
nigh inevitable whenever programmers use low-level crypto primitives.
Crypto is complicated, so pre-rolled solutions are important
prevention mechanisms.
NaCl is Bernstein, Lange, and Schwabe’s
solution: a high-level, performant cryptography library with a no-fuss
interface. Saltine is a Haskell
binding to NaCl (via
libsodium
) which hopes to
provide even more simplicity and safety to the usage of cryptography.
Note that it’s still possible to shoot yourself in the foot pretty
easily using Saltine. Nonces must always be unique which must be managed
by the library user.
Crypto.Saltine.Core.Stream
produces messages which can beundetectably tampered with in-flight.
Keys are insecurely read from disk—they may be copied and then paged
back to disk.
When uncertain, use Crypto.Saltine.Core.SecretBox
and Crypto.Saltine.Core.Box
.
If you can think of ways to use Haskell’s type system to enforce
security invariants, please suggest them.
To use it on Windows systems, download
a prebuild libsodium-*-stable-mingw.tar.gz file
and copy the files in libsodium-win64
into the equivalent places
in C:\Program Files\Haskell Platform\*\mingw
. Then just add saltine
to your cabal file and watch it go.
Tested with libsodium-1.0.18
.
Inspired by @thoughtpolice’s
salt
library. salt
also
binds to NaCl, but uses a Haskell managed version of djb’s code
instead of libsodium
.