chickadee » hmac

HMAC

Description

Provides a basic and primitive hmac. From wikipedia: "In cryptography, HMAC (Hash-based Message Authentication Code) is a specific construction for calculating a message authentication code (MAC) involving a cryptographic hash function in combination with a secret key."

Repository

https://github.com/ThomasHintz/chicken-scheme-hmac

Author

Thomas Hintz

Contact me at t@thintz.com.

Requirements

List of Procedures

hmac

hmac key digest-primitive #!optional (result-form 'string)procedure

Takes key and digest-primitive and returns a function that takes message and produces an hmac.

The result-form parameter may be used to change the format of the resulting hash, please refer to the message-digest documentation for more informations.

hmac-primitive

hmac-primitive key digest-primitiveprocedure

Takes key and digest-primitive and returns a message-digest-primitive that calculates the HMAC with the parameters given.

Example

(use hmac sha1)

((hmac "secret-key" (sha1-primitive)) "message")

Version History

7.1.0

Rewritten as a message-digest primitive. Removed the block-size parameter as that's something specified by the hashing algorithm chosen.

7.0.1

The hmac procedure no longer destroys the input. Code cleanup and miscellaneous fixes.

7

Removed dependency on srfi-4-utils as it is GPL and hmac is BSD.

6

Fixed egg category (was cryptography, now crypt)

4

Forgot to update .setup to match version in .release-info

3

Fixed install dependency bug

2

...not sure...

1

Initial release.

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