;;; hmac-def.el --- A macro for defining HMAC functions.
-;; Copyright (C) 1999, 2001 Free Software Foundation, Inc.
+;; Copyright (C) 1999, 2001, 2007-2016 Free Software Foundation, Inc.
;; Author: Shuhei KOBAYASHI <shuhei@aqua.ocn.ne.jp>
-;; Keywords: HMAC, RFC 2104
+;; Keywords: HMAC, RFC2104
-;; This file is part of FLIM (Faithful Library about Internet Message).
+;; This file is part of GNU Emacs.
-;; 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
+;; 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 of the License, or
;; (at your option) any later version.
-;; This program is distributed in the hope that it will be useful,
+;; 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 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.
+;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
-;; This program is implemented from RFC 2104,
+;; This program is implemented from RFC2104,
;; "HMAC: Keyed-Hashing for Message Authentication".
;;; Code:
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))))))
+ `(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
projects / gnus / blobdiff