[Emacs-diffs] Changes to hmac-def.el

[Glenn Morris]

CVSROOT:        /sources/emacs
Module name:    emacs
Changes by:     Glenn Morris <gm>       07/11/28 08:06:10

Index: hmac-def.el
===================================================================
RCS file: hmac-def.el
diff -N hmac-def.el
--- hmac-def.el 28 Nov 2007 07:54:51 -0000      1.2
+++ /dev/null   1 Jan 1970 00:00:00 -0000
@@ -1,86 +0,0 @@
-;;; hmac-def.el --- A macro for defining HMAC functions.
-
-;; Copyright (C) 1999, 2001, 2007  Free Software Foundation, Inc.
-
-;; Author: Shuhei KOBAYASHI <address@hidden>
-;; Keywords: HMAC, RFC 2104
-
-;; This file is part of GNU Emacs.
-
-;; GNU Emacs 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.
-
-;; GNU Emacs 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 GNU Emacs; see the file COPYING.  If not, write to the
-;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-;; Boston, MA 02110-1301, USA.
-
-;;; Commentary:
-
-;; This program is implemented from RFC 2104,
-;; "HMAC: Keyed-Hashing for Message Authentication".
-
-;;; Code:
-
-(defmacro define-hmac-function (name H B L &optional bit)
-  "Define a function NAME(TEXT KEY) which computes HMAC with function H.
-
-HMAC function is H(KEY XOR opad, H(KEY XOR ipad, TEXT)):
-
-H is a cryptographic hash function, such as SHA1 and MD5, which takes
-a string and return a digest of it (in binary form).
-B is a byte-length of a block size of H. (B=64 for both SHA1 and MD5.)
-L is a byte-length of hash outputs. (L=16 for MD5, L=20 for SHA1.)
-If BIT is non-nil, truncate output to specified bits."
-  `(defun ,name (text key)
-     ,(concat "Compute "
-             (upcase (symbol-name name))
-             " over TEXT with KEY.")
-     (let ((key-xor-ipad (make-string ,B ?\x36))
-          (key-xor-opad (make-string ,B ?\x5C))
-          (len (length key))
-          (pos 0))
-       (unwind-protect
-          (progn
-            ;; if `key' is longer than the block size, apply hash function
-            ;; to `key' and use the result as a real `key'.
-            (if (> len ,B)
-                (setq key (,H key)
-                      len ,L))
-            (while (< pos len)
-              (aset key-xor-ipad pos (logxor (aref key pos) ?\x36))
-              (aset key-xor-opad pos (logxor (aref key pos) ?\x5C))
-              (setq pos (1+ pos)))
-            (setq key-xor-ipad (unwind-protect
-                                   (concat key-xor-ipad text)
-                                 (fillarray key-xor-ipad 0))
-                  key-xor-ipad (unwind-protect
-                                   (,H key-xor-ipad)
-                                 (fillarray key-xor-ipad 0))
-                  key-xor-opad (unwind-protect
-                                   (concat key-xor-opad key-xor-ipad)
-                                 (fillarray key-xor-opad 0))
-                  key-xor-opad (unwind-protect
-                                   (,H key-xor-opad)
-                                 (fillarray key-xor-opad 0)))
-            ;; now `key-xor-opad' contains
-            ;; H(KEY XOR opad, H(KEY XOR ipad, TEXT)).
-            ,(if (and bit (< (/ bit 8) L))
-                 `(substring key-xor-opad 0 ,(/ bit 8))
-               ;; return a copy of `key-xor-opad'.
-               `(concat key-xor-opad)))
-        ;; cleanup.
-        (fillarray key-xor-ipad 0)
-        (fillarray key-xor-opad 0)))))
-
-(provide 'hmac-def)
-
-;;; arch-tag: 645adcef-b835-4900-a10a-11f636c982b9
-;;; hmac-def.el ends here