/usr/share/gauche-0.9/0.9.5/lib/rfc/hmac.scm is in gauche 0.9.5-1build1.
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;;; hmac - HMAC keyed-hashing
;;;
;;; Copyright (c) 2002-2003 Kimura Fuyuki, All rights reserved.
;;;
;;; Redistribution and use in source and binary forms, with or without
;;; modification, are permitted provided that the following conditions
;;; are met:
;;;
;;; 1. Redistributions of source code must retain the above copyright
;;; notice, this list of conditions and the following disclaimer.
;;;
;;; 2. Redistributions in binary form must reproduce the above copyright
;;; notice, this list of conditions and the following disclaimer in the
;;; documentation and/or other materials provided with the distribution.
;;;
;;; 3. Neither the name of the authors nor the names of its contributors
;;; may be used to endorse or promote products derived from this
;;; software without specific prior written permission.
;;;
;;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
;;; "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
;;; LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
;;; A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
;;; OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
;;; SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
;;; TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
;;; PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
;;; LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
;;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
;;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;;;
;;; RFC 2104 HMAC: Keyed-Hashing for Message Authentication
(define-module rfc.hmac
(use util.digest)
(use gauche.uvector)
(export <hmac> hmac-update! hmac-final! hmac-digest hmac-digest-string))
(select-module rfc.hmac)
(define-class <hmac> ()
((key :getter key-of)
(hasher :getter hasher-of)))
(define-method initialize ((self <hmac>) initargs)
(next-method)
(let-keywords initargs ([key #f]
[hasher #f]
[block-size #f])
(unless (and key hasher)
(error "key and hasher must be given"))
(let1 block-size (or block-size (slot-ref hasher 'hmac-block-size))
(when (> (string-size key) block-size)
(set! key (digest-string hasher key)))
(slot-set! self 'key
(string-append key
(make-byte-string (- block-size
(string-size key))
#x0)))
(slot-set! self 'hasher (make hasher))
(let* ([v (string->u8vector (key-of self))]
[ipad (u8vector->string (u8vector-xor v #x36))])
(digest-update! (hasher-of self) ipad)))))
(define-method hmac-update! ((self <hmac>) data)
(digest-update! (hasher-of self) data))
(define-method hmac-final! ((self <hmac>))
(let* ((v (string->u8vector (key-of self)))
(opad (u8vector->string (u8vector-xor v #x5c)))
(inner (digest-final! (hasher-of self)))
(outer (digest-string (class-of (hasher-of self))
(string-append opad inner))))
outer))
(define (hmac-digest . args)
(let1 hmac (apply make <hmac> args)
(generator-for-each
(cut hmac-update! hmac <>)
(cut read-block 4096))
(hmac-final! hmac)))
(define (hmac-digest-string string . args)
(with-input-from-string string
(cut apply hmac-digest args)))
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