Log Message:
Import rhash-1.3.1 as misc/rhash.

RHash is a console utility for calculation and verification of
magnet links and a wide range of hash sums like CRC32, MD4, MD5,
SHA1, SHA256, SHA512, SHA3, AICH, ED2K, Tiger, DC++ TTH, BitTorrent
BTIH, GOST R 34.11-94, RIPEMD-160, HAS-160, EDON-R, Whirlpool and
Snefru.

Hash sums are used to ensure and verify integrity of large volumes
of data for a long-term storing or transferring.