/usr/share/gauche-0.9/0.9.4/lib/util/digest.scm is in gauche 0.9.4-3.
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;;; digest - abstract base class for message digest algorithms
;;;
;;; 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,
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;;; TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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;;;
;; An abstract base- and meta-class of message digest algorithms.
;; The concrete implementation is given in modules such as
;; rfc.md5 and rfc.sha1.
(define-module util.digest
(export <message-digest-algorithm> <message-digest-algorithm-meta>
digest-update! digest-final! digest digest-string
digest-hexify)
)
(select-module util.digest)
(define-class <message-digest-algorithm-meta> (<class>)
;; Block size (in bytes) used in HMAC, determined by each algorithm.
;; Older algorithms uses 64, while SHA-384/512 uses 128.
((hmac-block-size :init-keyword :hmac-block-size :init-value 64)))
(define-class <message-digest-algorithm> ()
()
:metaclass <message-digest-algorithm-meta>)
(define-method digest-update! ((self <message-digest-algorithm>) data)
#f)
(define-method digest-final! ((self <message-digest-algorithm>))
#f)
(define-method digest ((class <message-digest-algorithm-meta>))
#f)
(define-method digest-string ((class <message-digest-algorithm-meta>) string)
(with-input-from-string string (cut digest class)))
;; utility
(define (digest-hexify string)
(with-string-io string
(cut generator-for-each (cut format #t "~2,'0x" <>) read-byte)))
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