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erlfernet's Introduction

fernet for Erlang

Build Status

This is an Erlang implementation of the Fernet specification which

"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."

Interface

1> Key = fernet:generate_encoded_key().
<<"iXOktbuC7QYXM9aF_m49VAqdkZ6jQBMsqjYwEHTm5ps=">>

2> Token = fernet:generate_token("hello", Key).
<<"gAAAAABVguk6wOivag6ZN_76fP2EXltZGJ9yPLLXKg4aBR9ekbhVnYmkJOuqTGl_GlmNlg6Z_KDl2wb1duRV41CNbF931n4LgA==">>

3> fernet:verify_and_decrypt_token(Token, Key, infinity).
{ok,<<"hello">>}

4> TTL = 10. % seconds
10

5> fernet:verify_and_decrypt_token(Token, Key, TTL).
{error, too_old}

erlfernet's People

Contributors

bigkevmcd avatar ferd avatar jkakar avatar

Stargazers

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Watchers

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Forkers

jkakar ferd jasonwebster edwardt stillinbeta

erlfernet's Issues

Is the TTL intended to be checked in seconds or microseconds?

https://github.com/bigkevmcd/erlfernet/blob/master/src/fernet.erl#L124

This code right there runs timer:now_diff/2 which compares two timestamps and returns the difference in terms of µs. However, everything else works in seconds. Am I right in thinking this is a bug on the TTL check that should be fixed? There's one test that fails if we turn this to seconds, but works otherwise.

If I'm right, I'll try to submit a patch soonish as I started looking back into this with 18.0+ support (with better time functions)

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