Fernet generates and verifies HMAC-based authentication tokens.
Fernet takes a user-provided message (an arbitrary sequence of bytes), a key (256 bits), and the current time, and produces a token, which contains the message in a form that can't be read or altered without the key.
This package is compatible with the other implementations at https://github.com/fernet. They can exchange tokens freely among each other.
$ go get github.com/fernet/fernet-go
For more information and background, see the Fernet spec at https://github.com/fernet/spec.
Fernet is distributed under the terms of the MIT license. See the License file for details.