mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-11-23 07:19:15 +00:00
244 lines
8.7 KiB
EmacsLisp
244 lines
8.7 KiB
EmacsLisp
;;; md4.el --- MD4 Message Digest Algorithm. -*- lexical-binding: t -*-
|
|
|
|
;; Copyright (C) 2001, 2004, 2007-2021 Free Software Foundation, Inc.
|
|
|
|
;; Author: Taro Kawagishi <tarok@transpulse.org>
|
|
;; Keywords: MD4
|
|
;; Old-Version: 1.00
|
|
;; Created: February 2001
|
|
|
|
;; 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 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 GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
|
|
|
|
;;; Commentary:
|
|
|
|
;; The MD4 Message-Digest Algorithm.
|
|
;;
|
|
;; The security of the MD4 hashing algorithm is very poor to
|
|
;; non-existent. It was declared obsolete by RFC 6150 in 2011:
|
|
;; https://tools.ietf.org/html/rfc6150
|
|
;;
|
|
;; You probably want to use `secure-hash' instead.
|
|
|
|
;;; Code:
|
|
|
|
;;;
|
|
;;; MD4 hash calculation
|
|
|
|
(defvar md4-buffer (make-vector 4 '(0 . 0))
|
|
"Work buffer of four 32-bit integers.")
|
|
|
|
(defun md4 (in n)
|
|
"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.
|
|
|
|
The security of the MD4 hashing algorithm is very poor to
|
|
non-existent. It was declared obsolete by RFC 6150 in 2011.
|
|
|
|
You probably want to use `secure-hash' instead."
|
|
(let (m
|
|
(b (cons 0 (* n 8)))
|
|
(i 0)
|
|
(buf (make-string 128 0)) c4)
|
|
;; initial values
|
|
(aset md4-buffer 0 '(26437 . 8961)) ;0x67452301
|
|
(aset md4-buffer 1 '(61389 . 43913)) ;0xefcdab89
|
|
(aset md4-buffer 2 '(39098 . 56574)) ;0x98badcfe
|
|
(aset md4-buffer 3 '(4146 . 21622)) ;0x10325476
|
|
|
|
;; process the string in 64 bits chunks
|
|
(while (> n 64)
|
|
(setq m (md4-copy64 (substring in 0 64)))
|
|
(md4-64 m)
|
|
(setq in (substring in 64))
|
|
(setq n (- n 64)))
|
|
|
|
;; process the rest of the string (length is now n <= 64)
|
|
(setq i 0)
|
|
(while (< i n)
|
|
(aset buf i (aref in i))
|
|
(setq i (1+ i)))
|
|
(aset buf n 128) ;0x80
|
|
(if (<= n 55)
|
|
(progn
|
|
(setq c4 (md4-pack-int32 b))
|
|
(aset buf 56 (aref c4 0))
|
|
(aset buf 57 (aref c4 1))
|
|
(aset buf 58 (aref c4 2))
|
|
(aset buf 59 (aref c4 3))
|
|
(setq m (md4-copy64 buf))
|
|
(md4-64 m))
|
|
;; else
|
|
(setq c4 (md4-pack-int32 b))
|
|
(aset buf 120 (aref c4 0))
|
|
(aset buf 121 (aref c4 1))
|
|
(aset buf 122 (aref c4 2))
|
|
(aset buf 123 (aref c4 3))
|
|
(setq m (md4-copy64 buf))
|
|
(md4-64 m)
|
|
(setq m (md4-copy64 (substring buf 64)))
|
|
(md4-64 m)))
|
|
|
|
(concat (md4-pack-int32 (aref md4-buffer 0))
|
|
(md4-pack-int32 (aref md4-buffer 1))
|
|
(md4-pack-int32 (aref md4-buffer 2))
|
|
(md4-pack-int32 (aref md4-buffer 3))))
|
|
|
|
(defsubst md4-F (x y z) (logior (logand x y) (logand (lognot x) z)))
|
|
(defsubst md4-G (x y z) (logior (logand x y) (logand x z) (logand y z)))
|
|
(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)
|
|
(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)))
|
|
(h2 (logand 65535 (+ h1 (ash l1 -16))))
|
|
(l2 (logand 65535 l1))
|
|
;; cyclic shift of 32 bits integer
|
|
(h3 (logand 65535 (if (> s 15)
|
|
(+ (ash h2 (- s 32)) (ash l2 (- s 16)))
|
|
(+ (ash h2 s) (ash l2 (- s 16))))))
|
|
(l3 (logand 65535 (if (> s 15)
|
|
(+ (ash l2 (- s 32)) (ash h2 (- s 16)))
|
|
(+ (ash l2 s) (ash h2 (- s 16)))))))
|
|
(cons h3 l3))))
|
|
|
|
(md4-make-step md4-round1 md4-F)
|
|
(md4-make-step md4-round2 md4-G)
|
|
(md4-make-step md4-round3 md4-H)
|
|
|
|
(defsubst md4-add (x y)
|
|
"Return 32-bit sum of 32-bit integers X and Y."
|
|
(let ((h (+ (car x) (car y)))
|
|
(l (+ (cdr x) (cdr y))))
|
|
(cons (logand 65535 (+ h (ash l -16))) (logand 65535 l))))
|
|
|
|
(defsubst md4-and (x y)
|
|
(cons (logand (car x) (car y)) (logand (cdr x) (cdr y))))
|
|
|
|
(defun md4-64 (m)
|
|
"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))
|
|
(d (aref md4-buffer 3)))
|
|
(setq a (md4-round1 a b c d (aref m 0) 3 '(0 . 0))
|
|
d (md4-round1 d a b c (aref m 1) 7 '(0 . 0))
|
|
c (md4-round1 c d a b (aref m 2) 11 '(0 . 0))
|
|
b (md4-round1 b c d a (aref m 3) 19 '(0 . 0))
|
|
a (md4-round1 a b c d (aref m 4) 3 '(0 . 0))
|
|
d (md4-round1 d a b c (aref m 5) 7 '(0 . 0))
|
|
c (md4-round1 c d a b (aref m 6) 11 '(0 . 0))
|
|
b (md4-round1 b c d a (aref m 7) 19 '(0 . 0))
|
|
a (md4-round1 a b c d (aref m 8) 3 '(0 . 0))
|
|
d (md4-round1 d a b c (aref m 9) 7 '(0 . 0))
|
|
c (md4-round1 c d a b (aref m 10) 11 '(0 . 0))
|
|
b (md4-round1 b c d a (aref m 11) 19 '(0 . 0))
|
|
a (md4-round1 a b c d (aref m 12) 3 '(0 . 0))
|
|
d (md4-round1 d a b c (aref m 13) 7 '(0 . 0))
|
|
c (md4-round1 c d a b (aref m 14) 11 '(0 . 0))
|
|
b (md4-round1 b c d a (aref m 15) 19 '(0 . 0))
|
|
|
|
a (md4-round2 a b c d (aref m 0) 3 '(23170 . 31129)) ;0x5A827999
|
|
d (md4-round2 d a b c (aref m 4) 5 '(23170 . 31129))
|
|
c (md4-round2 c d a b (aref m 8) 9 '(23170 . 31129))
|
|
b (md4-round2 b c d a (aref m 12) 13 '(23170 . 31129))
|
|
a (md4-round2 a b c d (aref m 1) 3 '(23170 . 31129))
|
|
d (md4-round2 d a b c (aref m 5) 5 '(23170 . 31129))
|
|
c (md4-round2 c d a b (aref m 9) 9 '(23170 . 31129))
|
|
b (md4-round2 b c d a (aref m 13) 13 '(23170 . 31129))
|
|
a (md4-round2 a b c d (aref m 2) 3 '(23170 . 31129))
|
|
d (md4-round2 d a b c (aref m 6) 5 '(23170 . 31129))
|
|
c (md4-round2 c d a b (aref m 10) 9 '(23170 . 31129))
|
|
b (md4-round2 b c d a (aref m 14) 13 '(23170 . 31129))
|
|
a (md4-round2 a b c d (aref m 3) 3 '(23170 . 31129))
|
|
d (md4-round2 d a b c (aref m 7) 5 '(23170 . 31129))
|
|
c (md4-round2 c d a b (aref m 11) 9 '(23170 . 31129))
|
|
b (md4-round2 b c d a (aref m 15) 13 '(23170 . 31129))
|
|
|
|
a (md4-round3 a b c d (aref m 0) 3 '(28377 . 60321)) ;0x6ED9EBA1
|
|
d (md4-round3 d a b c (aref m 8) 9 '(28377 . 60321))
|
|
c (md4-round3 c d a b (aref m 4) 11 '(28377 . 60321))
|
|
b (md4-round3 b c d a (aref m 12) 15 '(28377 . 60321))
|
|
a (md4-round3 a b c d (aref m 2) 3 '(28377 . 60321))
|
|
d (md4-round3 d a b c (aref m 10) 9 '(28377 . 60321))
|
|
c (md4-round3 c d a b (aref m 6) 11 '(28377 . 60321))
|
|
b (md4-round3 b c d a (aref m 14) 15 '(28377 . 60321))
|
|
a (md4-round3 a b c d (aref m 1) 3 '(28377 . 60321))
|
|
d (md4-round3 d a b c (aref m 9) 9 '(28377 . 60321))
|
|
c (md4-round3 c d a b (aref m 5) 11 '(28377 . 60321))
|
|
b (md4-round3 b c d a (aref m 13) 15 '(28377 . 60321))
|
|
a (md4-round3 a b c d (aref m 3) 3 '(28377 . 60321))
|
|
d (md4-round3 d a b c (aref m 11) 9 '(28377 . 60321))
|
|
c (md4-round3 c d a b (aref m 7) 11 '(28377 . 60321))
|
|
b (md4-round3 b c d a (aref m 15) 15 '(28377 . 60321)))
|
|
|
|
(aset md4-buffer 0 (md4-add a (aref md4-buffer 0)))
|
|
(aset md4-buffer 1 (md4-add b (aref md4-buffer 1)))
|
|
(aset md4-buffer 2 (md4-add c (aref md4-buffer 2)))
|
|
(aset md4-buffer 3 (md4-add d (aref md4-buffer 3)))
|
|
))
|
|
|
|
(defun md4-copy64 (seq)
|
|
"Unpack a 64 bytes string into 16 pairs of 32 bits integers."
|
|
(let ((int32s (make-vector 16 0)) (i 0) j)
|
|
(while (< i 16)
|
|
(setq j (* i 4))
|
|
(aset int32s i (cons (+ (aref seq (+ j 2)) (ash (aref seq (+ j 3)) 8))
|
|
(+ (aref seq j) (ash (aref seq (1+ j)) 8))))
|
|
(setq i (1+ i)))
|
|
int32s))
|
|
|
|
;;;
|
|
;;; sub functions
|
|
|
|
(defun md4-pack-int16 (int16)
|
|
"Pack 16 bits integer in 2 bytes string as little endian."
|
|
(let ((str (make-string 2 0)))
|
|
(aset str 0 (logand int16 255))
|
|
(aset str 1 (ash int16 -8))
|
|
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)."
|
|
(let ((str (make-string 4 0))
|
|
(h (car int32)) (l (cdr int32)))
|
|
(aset str 0 (logand l 255))
|
|
(aset str 1 (ash l -8))
|
|
(aset str 2 (logand h 255))
|
|
(aset str 3 (ash h -8))
|
|
str))
|
|
|
|
(defun md4-unpack-int16 (str)
|
|
(if (eq 2 (length str))
|
|
(+ (ash (aref str 1) 8) (aref str 0))
|
|
(error "%s is not 2 bytes long" str)))
|
|
|
|
(defun md4-unpack-int32 (str)
|
|
(if (eq 4 (length str))
|
|
(cons (+ (ash (aref str 3) 8) (aref str 2))
|
|
(+ (ash (aref str 1) 8) (aref str 0)))
|
|
(error "%s is not 4 bytes long" str)))
|
|
|
|
(provide 'md4)
|
|
|
|
;;; md4.el ends here
|