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Article contents:== Outdated egg! This is an egg for CHICKEN 4, the unsupported old release. You're almost certainly looking for [[/eggref/5/hmac|the CHICKEN 5 version of this egg]], if it exists. If it does not exist, there may be equivalent functionality provided by another egg; have a look at the [[https://wiki.call-cc.org/chicken-projects/egg-index-5.html|egg index]]. Otherwise, please consider porting this egg to the current version of CHICKEN. == HMAC [[toc:]] === Description Provides a basic and primitive hmac. From [[https://secure.wikimedia.org/wikipedia/en/wiki/HMAC|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 [[/users/thomas-hintz|Thomas Hintz]] Contact me at t@thintz.com. === Requirements * [[Message Digest]] === List of Procedures ==== {{hmac}} <procedure>(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 [[/eggref/4/message-digest|message-digest documentation]] for more informations. ==== {{hmac-primitive}} <procedure>(hmac-primitive key digest-primitive)</procedure> Takes {{key}} and {{digest-primitive}} and returns a '''message-digest-primitive''' that calculates the HMAC with the parameters given. === Example <enscript highlight=scheme> (use hmac sha1) ((hmac "secret-key" (sha1-primitive)) "message") </enscript> === 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.Description of your changes:

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