Import sha1.el' and hex-util.el' for Emacs21.

* emacs21/sha1.el: Imported from Gnus distributed with Emacs
22.2.1 on Debian 5.0 for Emacs21 that does not include `sha1.el'.
* emacs21/hex-util.el: Imported from Gnus distributed with Emacs
22.2.1 on Debian 5.0 for Emacs21 that does not include
`hex-util.el'.

ChangeLog

@@ -93,6 +93,12 @@
 	strings even on Emacs23 and later.
 	* test/test-twittering-mode.el: add new test `test-hmac-sha1'.
 
+	* emacs21/sha1.el: Imported from Gnus distributed with Emacs
+	22.2.1 on Debian 5.0 for Emacs21 that does not include `sha1.el'.
+	* emacs21/hex-util.el: Imported from Gnus distributed with Emacs
+	22.2.1 on Debian 5.0 for Emacs21 that does not include
+	`hex-util.el'.
+
 2010-05-20  Tadashi MATSUO  <tad@mymail.twin.jp>
 
 	* twittering-mode.el: The configuration of a proxy is referred via

emacs21/hex-util.el

@@ -0,0 +1,75 @@
+;;; hex-util.el --- Functions to encode/decode hexadecimal string.
+
+;; Copyright (C) 1999, 2001, 2002, 2003, 2004,
+;;   2005, 2006, 2007, 2008 Free Software Foundation, Inc.
+
+;; Author: Shuhei KOBAYASHI <shuhei@aqua.ocn.ne.jp>
+;; Keywords: data
+
+;; 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 3, 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., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;;; Commentary:
+
+;;; Code:
+
+(eval-when-compile
+  (defmacro hex-char-to-num (chr)
+    `(let ((chr ,chr))
+       (cond
+        ((and (<= ?a chr)(<= chr ?f)) (+ (- chr ?a) 10))
+        ((and (<= ?A chr)(<= chr ?F)) (+ (- chr ?A) 10))
+        ((and (<= ?0 chr)(<= chr ?9)) (- chr ?0))
+        (t (error "Invalid hexadecimal digit `%c'" chr)))))
+  (defmacro num-to-hex-char (num)
+    `(aref "0123456789abcdef" ,num)))
+
+(defun decode-hex-string (string)
+  "Decode hexadecimal STRING to octet string."
+  (let* ((len (length string))
+	 (dst (make-string (/ len 2) 0))
+	 (idx 0)(pos 0))
+    (while (< pos len)
+      ;; logior and lsh are not byte-coded.
+      ;; (aset dst idx (logior (lsh (hex-char-to-num (aref string pos)) 4)
+      ;; 			    (hex-char-to-num (aref string (1+ pos)))))
+      (aset dst idx (+ (* (hex-char-to-num (aref string pos)) 16)
+		       (hex-char-to-num (aref string (1+ pos)))))
+      (setq idx (1+ idx)
+	    pos (+ 2 pos)))
+    dst))
+
+(defun encode-hex-string (string)
+  "Encode octet STRING to hexadecimal string."
+  (let* ((len (length string))
+	 (dst (make-string (* len 2) 0))
+	 (idx 0)(pos 0))
+    (while (< pos len)
+      ;; logand and lsh are not byte-coded.
+      ;; (aset dst idx (num-to-hex-char (logand (lsh (aref string pos) -4) 15)))
+      (aset dst idx (num-to-hex-char (/ (aref string pos) 16)))
+      (setq idx (1+ idx))
+      ;; (aset dst idx (num-to-hex-char (logand (aref string pos) 15)))
+      (aset dst idx (num-to-hex-char (% (aref string pos) 16)))
+      (setq idx (1+ idx)
+	    pos (1+ pos)))
+    dst))
+
+(provide 'hex-util)
+
+;; arch-tag: fe8aaa79-6c86-400e-813f-5a8cc4cb3859
+;;; hex-util.el ends here