Escher is a stateless HTTP request signing library to allow secure authorization and request validation. It is a generalized version of Amazon's AWS Signature Version 4 algorithm. The goal was implementing a protocol where every request is validated, and impossible to modify without knowing the secret.

Escher is great for creating secure REST API servers, both the request signing, and validation are implemented. The protocol also provides a solution for presigning URLs with expiration.

The status is work in progress, however we have implementations in 7 programming languages.

Your help will be much welcomed, we are especially interested in code reviews, library implementations in different languages, writing the documentation and promotion.

Feel free to join and discuss at Escher's general mailing list.

Implementations:

• PHP - source code: EscherPHP - composer package: emartech/escher
• Ruby - source code: EscherRuby - gem: escher
• NodeJS - source code: EscherJS - npm package: escher-auth