NaCl (pronounced "salt") is a new easy-to-use high-speed software
library for network communication, encryption, decryption,
signatures, etc. NaCl's goal is to provide all of the core
operations needed to build higher-level cryptographic tools.
http://nacl.cr.yp.to/
Sodium is a portable, cross-compilable, installable, packageable
crypto library based on NaCl, with a compatible API.
https://github.com/jedisct1/libsodium
Saltine is a Haskell binding to the NaCl primitives going through
Sodium for build convenience and, eventually, portability.