scrypt is a command line tool for encryption. It uses the Blake2b (https://blake2.net/) hash function to hash the provided encryption/decryption key and the salsa20, stream cipher implementation, by eSTREAM (ECRYPT Stream Cipher Project - http://www.ecrypt.eu.org/stream/e2-salsa20.html).
usage: scrypt { --help | -h | { -e | -d } } < input_file > output_file
--help | -h: help
-e: encrypt
-d: decrypt
How to build: "make" creates "scrypt" (or "scrypt.exe" in cygwin) in the project's root directory.
Why it was built: tar cj ... | scrypt -e | ncat ... <-- internet --> ncat ... | scrypt -d | tar xj (i.e., easy usage in a pipeline).