;;; md4.el --- MD4 Message Digest Algorithm.
-;; Copyright (C) 2004 Free Software Foundation, Inc.
-;; Copyright (C) 2001 Taro Kawagishi
+;; Copyright (C) 2001, 2004, 2007-2011 Free Software Foundation, Inc.
+
;; Author: Taro Kawagishi <tarok@transpulse.org>
;; Keywords: MD4
;; Version: 1.00
;; Created: February 2001
-;; 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
+;; 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 2, or (at your option)
-;; any later version.
-;;
-;; This program is distributed in the hope that it will be useful,
+;; the Free Software Foundation, either version 3 of the License, 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 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/>.
;;; Code:
;;; MD4 hash calculation
(defvar md4-buffer (make-vector 4 '(0 . 0))
- "work buffer of four 32-bit integers")
+ "Work buffer of four 32-bit integers.")
(defun md4 (in n)
- "Returns the MD4 hash string of 16 bytes long for a string IN of N
-bytes long. N is required to handle strings containing character 0."
+ "Return the MD4 hash for a string IN of length N bytes.
+The returned hash is 16 bytes long. N is required to handle
+strings containing the character 0."
(let (m
(b (cons 0 (* n 8)))
(i 0)
(defsubst md4-H (x y z) (logxor x y z))
(defmacro md4-make-step (name func)
- (`
- (defun (, name) (a b c d xk s ac)
+ `(defun ,name (a b c d xk s ac)
(let*
- ((h1 (+ (car a) ((, func) (car b) (car c) (car d)) (car xk) (car ac)))
- (l1 (+ (cdr a) ((, func) (cdr b) (cdr c) (cdr d)) (cdr xk) (cdr ac)))
+ ((h1 (+ (car a) (,func (car b) (car c) (car d)) (car xk) (car ac)))
+ (l1 (+ (cdr a) (,func (cdr b) (cdr c) (cdr d)) (cdr xk) (cdr ac)))
(h2 (logand 65535 (+ h1 (lsh l1 -16))))
(l2 (logand 65535 l1))
;; cyclic shift of 32 bits integer
(l3 (logand 65535 (if (> s 15)
(+ (lsh l2 (- s 32)) (lsh h2 (- s 16)))
(+ (lsh l2 s) (lsh h2 (- s 16)))))))
- (cons h3 l3)))))
+ (cons h3 l3))))
(md4-make-step md4-round1 md4-F)
(md4-make-step md4-round2 md4-G)
(cons (logand (car x) (car y)) (logand (cdr x) (cdr y))))
(defun md4-64 (m)
- "Calculate md4 of 64 bytes chunk M which is represented as 16 pairs of
-32 bits integers. The resulting md4 value is placed in md4-buffer."
+ "Calculate MD4 hash of M.
+M is a 64-bytes chunk, represented as 16 pairs of 32-bit integers.
+The resulting MD4 value is placed in `md4-buffer'."
(let ((a (aref md4-buffer 0))
(b (aref md4-buffer 1))
(c (aref md4-buffer 2))
str))
(defun md4-pack-int32 (int32)
- "Pack 32 bits integer in a 4 bytes string as little endian. A 32 bits
-integer is represented as a pair of two 16 bits integers (cons high low)."
+ "Pack 32 bits integer in a 4 bytes string as little endian.
+A 32 bits integer is represented as a pair of two 16 bits
+integers (cons high low)."
(let ((str (make-string 4 0))
(h (car int32)) (l (cdr int32)))
(aset str 0 (logand l 255))
(provide 'md4)
-;;; arch-tag: 99d706fe-089b-42ea-9507-67ae41091e6e
;;; md4.el ends here