Log Message:
(security/R-soduim) import R-sodium-1.2.0

Bindings to 'libsodium': a modern, easy-to-use software library for
encryption, decryption, signatures, password hashing and more. Sodium
uses curve25519, a state-of-the-art Diffie-Hellman function by Daniel
Bernstein, which has become very popular after it was discovered that
the NSA had backdoored Dual EC DRBG.