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#lang typed/racket
;;; Copyright 2011, Matthias Andreas Benkard.
;;;
;;;-----------------------------------------------------------------------------
;;; This program is free software: you can redistribute it and/or modify
;;; it under the terms of the GNU Affero General Public License as published by
;;; the Free Software Foundation, either version 3 of the License, or
;;; (at your option) any later version.
;;;
;;; This program is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU Affero General Public License for more details.
;;;
;;; You should have received a copy of the GNU Affero General Public License
;;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;;-----------------------------------------------------------------------------
;;;
(require "util.rkt")
(provide: [hmac ((Bytes -> Exact-Nonnegative-Integer)
Exact-Nonnegative-Integer
Exact-Nonnegative-Integer
Bytes
Bytes
->
Exact-Nonnegative-Integer)])
;; Example:
;;
;; (hmac whirlpool 64 64 #"<secret key>" #"hello")
;;
(define (hmac hashfn blocksize hashsize key msg)
(let ([opad (make-bytes blocksize #x5c)]
[ipad (make-bytes blocksize #x36)]
[padded-key
(pad-bytes (if (> (bytes-length key) blocksize)
(integer->bytes (hashfn key))
key)
blocksize
#x0
'left)])
(hashfn (bytes-append (integer->bytes/size
(bitwise-xor (bytes->integer opad)
(bytes->integer key))
blocksize)
(integer->bytes/size
(hashfn
(bytes-append
(integer->bytes/size
(bitwise-xor (bytes->integer ipad)
(bytes->integer key))
blocksize)
msg))
hashsize)))))
;; According to Ironclad:
;;
;; CRYPTO[12]> (map nil
;; (lambda (x) (format t "~x" x))
;; (hmac-digest (make-hmac "" 'whirlpool)))
;; 57D73990319055DEFA7739FF7B72406A927BBC54E8FCDC98E145FA4C36CE83
;; A9CF165AD1E0D1925F93AC1D12B985A26044E9FB1B9CCE24301FAA76EAAB53
;;
#;
(begin
(require "whirlpool.rkt")
(printf "~x~%" (hmac whirlpool 64 64 #"" #"")))
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