- https://github.com/paragonie/past/blob/master/docs/01-Protocol-Versions/Common.md
- https://github.com/paragonie/past/blob/master/src/Protocol/Version2.php
- https://github.com/paragonie/past/tree/master/docs/01-Protocol-Versiogns
- https://github.com/paragonie/past/blob/master/docs/01-Protocol-Versions/Common.md
- https://github.com/paragonie/past/tree/master/docs
- https://github.com/paragonie/past
- https://github.com/gtank/cryptopasta/blob/master/sign.go
- golang/go#21447 (comment)
- https://github.com/aead/chacha20poly1305
- https://godoc.org/golang.org/x/crypto/ed25519
- https://github.com/dgrijalva/jwt-go/blob/master/hmac.go
- https://github.com/paragonie/past/blob/master/src/Protocol/Version2.php