simple-secrets.rb 
The Ruby implementation of a simple, opinionated library for encrypting small packets of data securely. Designed for exchanging tokens among systems written in a variety of programming languages:
Examples
Basic
Send:
require 'simple-secrets'
include SimpleSecrets
# Try `head /dev/urandom | shasum -a 256` to make a decent 256-bit key
sender = Packet.new '<64-char hex string master key (32 bytes, 256 bits)>'
# => #<SimpleSecrets::Packet:0x007fec7c198e60 @master_key="d\xDD\xB5...", @identity="B\xBE...">
packet = sender.pack msg: 'this is a secret message'
# => 'Qr4m7AughkcQIRqQvlyXiB67EwHdBf5n9JD2s_Z9NpO4ksPGvLYjNbDm3HRzvFXFSpV2IqDQw_LTamndMh2c7iOQT0lSp4LstqJPAtoQklU5sb7JHYyTOuf-6W-q7W8gAnq1wCs5'Receive:
require 'simple-secrets'
include SimpleSecrets
# Same shared key
sender = Packet.new '<64-char hex string master key (32 bytes, 256 bits)>'
# Read data from somewhere
packet = 'OqlG6KVMeyFYmunboS3HIXkvN_nXKTxg2yNkQydZOhvJrZvmfov54hUmkkiZCnlhzyrlwOJkbV7XnPPbqvdzZ6TsFOO5YdmxjxRksZmeIhbhLaMiDbfsOuSY1dBn_ZgtYCw-FRIM'
secret_message = sender.unpack(packet);
# => {"msg"=>"this is a secret message"}Can you add ...
This implementation follows the spec for the Node.js version for 100% compatibility.
License
MIT.