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+;;; hmac-sha1.el --- Compute HMAC-SHA1.
+
+;; Copyright (C) 1999 Shuhei KOBAYASHI
+
+;; Author: Shuhei KOBAYASHI <shuhei@aqua.ocn.ne.jp>
+;; Keywords: HMAC, RFC 2104, HMAC-SHA1, SHA1, Cancel-Lock
+
+;; This file is part of FLIM (Faithful Library about Internet Message).
+
+;; This program is free software; you can redistribute it and/or
+;; modify it under the terms of the GNU General Public License as
+;; published by the Free Software Foundation; either version 2, 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 General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program; see the file COPYING.  If not, write to
+;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;; Test cases from RFC 2202, "Test Cases for HMAC-MD5 and HMAC-SHA-1".
+;;
+;; (encode-hex-string (hmac-sha1 "Hi There" (make-string 20 ?\x0b)))
+;;  => "b617318655057264e28bc0b6fb378c8ef146be00"
+;;
+;; (encode-hex-string (hmac-sha1 "what do ya want for nothing?" "Jefe"))
+;;  => "effcdf6ae5eb2fa2d27416d5f184df9c259a7c79"
+;;
+;; (encode-hex-string (hmac-sha1 (make-string 50 ?\xdd) (make-string 20 ?\xaa)))
+;;  => "125d7342b9ac11cd91a39af48aa17b4f63f175d3"
+;;
+;; (encode-hex-string
+;;  (hmac-sha1
+;;   (make-string 50 ?\xcd)
+;;   (decode-hex-string "0102030405060708090a0b0c0d0e0f10111213141516171819")))
+;;  => "4c9007f4026250c6bc8414f9bf50c86c2d7235da"
+;;
+;; (encode-hex-string
+;;  (hmac-sha1 "Test With Truncation" (make-string 20 ?\x0c)))
+;;  => "4c1a03424b55e07fe7f27be1d58bb9324a9a5a04"
+;; (encode-hex-string
+;;  (hmac-sha1-96 "Test With Truncation" (make-string 20 ?\x0c)))
+;;  => "4c1a03424b55e07fe7f27be1"
+;;
+;; (encode-hex-string
+;;  (hmac-sha1
+;;   "Test Using Larger Than Block-Size Key - Hash Key First"
+;;   (make-string 80 ?\xaa)))
+;;  => "aa4ae5e15272d00e95705637ce8a3b55ed402112"
+;;
+;; (encode-hex-string
+;;  (hmac-sha1
+;;   "Test Using Larger Than Block-Size Key and Larger Than One Block-Size Data"
+;;   (make-string 80 ?\xaa)))
+;;  => "e8e99d0f45237d786d6bbaa7965c7808bbff1a91"
+
+;;; Code:
+
+(eval-when-compile (require 'hmac-def))
+(require 'hex-util)			; (decode-hex-string STRING)
+(require 'sha1)				; expects (sha1 STRING)
+
+;;; For consintency with hmac-md5.el, we define this function here.
+(or (fboundp 'sha1-binary)
+    (defun sha1-binary (string)
+      "Return the SHA1 of STRING in binary form."
+      (decode-hex-string (sha1 string))))
+
+(define-hmac-function hmac-sha1 sha1-binary 64 20) ; => (hmac-sha1 TEXT KEY)
+;; (define-hmac-function hmac-sha1-96 sha1-binary 64 20 96)
+
+(provide 'hmac-sha1)
+
+;;; hmac-sha1.el ends here