libsodium is a library for network communication, encryption,
decryption, signatures, etc.

libsodium is a portable, cross-compilable, installable,
packageable, API-compatible version of NaCl(security/nacl).
NaCl's goal is to provide all of the core operations needed
to build higher-level cryptographic tools.

WWW: https://github.com/jedisct1/libsodium