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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 | ;;; md5.el -- MD5 Message Digest Algorithm
;;; Gareth Rees <gdr11@cl.cam.ac.uk>
;; LCD Archive Entry:
;; md5|Gareth Rees|gdr11@cl.cam.ac.uk|
;; MD5 cryptographic message digest algorithm|
;; 13-Nov-95|1.0|~/misc/md5.el.Z|
;;; Details: ------------------------------------------------------------------
;; This is a direct translation into Emacs LISP of the reference C
;; implementation of the MD5 Message-Digest Algorithm written by RSA
;; Data Security, Inc.
;;
;; The algorithm takes a message (that is, a string of bytes) and
;; computes a 16-byte checksum or "digest" for the message. This digest
;; is supposed to be cryptographically strong in the sense that if you
;; are given a 16-byte digest D, then there is no easier way to
;; construct a message whose digest is D than to exhaustively search the
;; space of messages. However, the robustness of the algorithm has not
;; been proven, and a similar algorithm (MD4) was shown to be unsound,
;; so treat with caution!
;;
;; The C algorithm uses 32-bit integers; because GNU Emacs
;; implementations provide 28-bit integers (with 24-bit integers on
;; versions prior to 19.29), the code represents a 32-bit integer as the
;; cons of two 16-bit integers. The most significant word is stored in
;; the car and the least significant in the cdr. The algorithm requires
;; at least 17 bits of integer representation in order to represent the
;; carry from a 16-bit addition.
;;; Usage: --------------------------------------------------------------------
;; To compute the MD5 Message Digest for a message M (represented as a
;; string or as a vector of bytes), call
;;
;; (md5-encode M)
;;
;; which returns the message digest as a vector of 16 bytes. If you
;; need to supply the message in pieces M1, M2, ... Mn, then call
;;
;; (md5-init)
;; (md5-update M1)
;; (md5-update M2)
;; ...
;; (md5-update Mn)
;; (md5-final)
;;; Copyright and licence: ----------------------------------------------------
;; Copyright (C) 1995, 1996, 1997 by Gareth Rees
;; Derived from the RSA Data Security, Inc. MD5 Message-Digest Algorithm
;;
;; md5.el 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.
;;
;; md5.el 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.
;;
;; The original copyright notice is given below, as required by the
;; licence for the original code. This code is distributed under *both*
;; RSA's original licence and the GNU General Public Licence. (There
;; should be no problems, as the former is more liberal than the
;; latter).
;;; Original copyright notice: ------------------------------------------------
;; Copyright (C) 1990, RSA Data Security, Inc. All rights reserved.
;;
;; License to copy and use this software is granted provided that it is
;; identified as the "RSA Data Security, Inc. MD5 Message- Digest
;; Algorithm" in all material mentioning or referencing this software or
;; this function.
;;
;; License is also granted to make and use derivative works provided
;; that such works are identified as "derived from the RSA Data
;; Security, Inc. MD5 Message-Digest Algorithm" in all material
;; mentioning or referencing the derived work.
;;
;; RSA Data Security, Inc. makes no representations concerning either
;; the merchantability of this software or the suitability of this
;; software for any particular purpose. It is provided "as is" without
;; express or implied warranty of any kind.
;;
;; These notices must be retained in any copies of any part of this
;; documentation and/or software.
;;; Code: ---------------------------------------------------------------------
(defvar md5-program "md5"
"*Program that reads a message on its standard input and writes an
MD5 digest on its output.")
(defvar md5-maximum-internal-length 4096
"*The maximum size of a piece of data that should use the MD5 routines
written in lisp. If a message exceeds this, it will be run through an
external filter for processing. Also see the `md5-program' variable.
This variable has no effect if you call the md5-init|update|final
functions - only used by the `md5' function's simpler interface.")
(defvar md5-bits (make-vector 4 0)
"Number of bits handled, modulo 2^64.
Represented as four 16-bit numbers, least significant first.")
(defvar md5-buffer (make-vector 4 '(0 . 0))
"Scratch buffer (four 32-bit integers).")
(defvar md5-input (make-vector 64 0)
"Input buffer (64 bytes).")
(defun md5-unhex (x)
(if (> x ?9)
(if (>= x ?a)
(+ 10 (- x ?a))
(+ 10 (- x ?A)))
(- x ?0)))
(defun md5-encode (message)
"Encodes MESSAGE using the MD5 message digest algorithm.
MESSAGE must be a string or an array of bytes.
Returns a vector of 16 bytes containing the message digest."
(if (or (null md5-maximum-internal-length)
(<= (length message) md5-maximum-internal-length))
(progn
(md5-init)
(md5-update message)
(md5-final))
(save-excursion
(set-buffer (get-buffer-create " *md5-work*"))
(erase-buffer)
(insert message)
(call-process-region (point-min) (point-max)
md5-program
t (current-buffer))
;; MD5 digest is 32 chars long
;; mddriver adds a newline to make neaten output for tty
;; viewing, make sure we leave it behind.
(let ((data (buffer-substring (point-min) (+ (point-min) 32)))
(vec (make-vector 16 0))
(ctr 0))
(while (< ctr 16)
(aset vec ctr (+ (* 16 (md5-unhex (aref data (* ctr 2))))
(md5-unhex (aref data (1+ (* ctr 2))))))
(setq ctr (1+ ctr)))))))
(defsubst md5-add (x y)
"Return 32-bit sum of 32-bit integers X and Y."
(let ((m (+ (car x) (car y)))
(l (+ (cdr x) (cdr y))))
(cons (logand 65535 (+ m (lsh l -16))) (logand l 65535))))
;; FF, GG, HH and II are basic MD5 functions, providing transformations
;; for rounds 1, 2, 3 and 4 respectively. Each function follows this
;; pattern of computation (where ROTATE(x,y) means rotate 32-bit value x
;; by y bits to the left):
;;
;; FF(a,b,c,d,x,s,ac) = ROTATE(a + F(b,c,d) + x + ac,s) + b
;;
;; so we use the macro `md5-make-step' to construct each one. The
;; helper functions F, G, H and I operate on 16-bit numbers; the full
;; operation splits its inputs, operates on the halves separately and
;; then puts the results together.
(defsubst md5-F (x y z) (logior (logand x y) (logand (lognot x) z)))
(defsubst md5-G (x y z) (logior (logand x z) (logand y (lognot z))))
(defsubst md5-H (x y z) (logxor x y z))
(defsubst md5-I (x y z) (logxor y (logior x (logand 65535 (lognot z)))))
(defmacro md5-make-step (name func)
`(defun ,name (a b c d x s ac)
(let*
((m1 (+ (car a) (,func (car b) (car c) (car d)) (car x) (car ac)))
(l1 (+ (cdr a) (,func (cdr b) (cdr c) (cdr d)) (cdr x) (cdr ac)))
(m2 (logand 65535 (+ m1 (lsh l1 -16))))
(l2 (logand 65535 l1))
(m3 (logand 65535 (if (> s 15)
(+ (lsh m2 (- s 32)) (lsh l2 (- s 16)))
(+ (lsh m2 s) (lsh l2 (- s 16))))))
(l3 (logand 65535 (if (> s 15)
(+ (lsh l2 (- s 32)) (lsh m2 (- s 16)))
(+ (lsh l2 s) (lsh m2 (- s 16)))))))
(md5-add (cons m3 l3) b))))
(md5-make-step md5-FF md5-F)
(md5-make-step md5-GG md5-G)
(md5-make-step md5-HH md5-H)
(md5-make-step md5-II md5-I)
(defun md5-init ()
"Initialise the state of the message-digest routines."
(aset md5-bits 0 0)
(aset md5-bits 1 0)
(aset md5-bits 2 0)
(aset md5-bits 3 0)
(aset md5-buffer 0 '(26437 . 8961))
(aset md5-buffer 1 '(61389 . 43913))
(aset md5-buffer 2 '(39098 . 56574))
(aset md5-buffer 3 '( 4146 . 21622)))
(defun md5-update (string)
"Update the current MD5 state with STRING (an array of bytes)."
(let ((len (length string))
(i 0)
(j 0))
(while (< i len)
;; Compute number of bytes modulo 64
(setq j (% (/ (aref md5-bits 0) 8) 64))
;; Store this byte (truncating to 8 bits to be sure)
(aset md5-input j (logand 255 (aref string i)))
;; Update number of bits by 8 (modulo 2^64)
(let ((c 8) (k 0))
(while (and (> c 0) (< k 4))
(let ((b (aref md5-bits k)))
(aset md5-bits k (logand 65535 (+ b c)))
(setq c (if (> b (- 65535 c)) 1 0)
k (1+ k)))))
;; Increment number of bytes processed
(setq i (1+ i))
;; When 64 bytes accumulated, pack them into sixteen 32-bit
;; integers in the array `in' and then tranform them.
(if (= j 63)
(let ((in (make-vector 16 (cons 0 0)))
(k 0)
(kk 0))
(while (< k 16)
(aset in k (md5-pack md5-input kk))
(setq k (+ k 1) kk (+ kk 4)))
(md5-transform in))))))
(defun md5-pack (array i)
"Pack the four bytes at ARRAY reference I to I+3 into a 32-bit integer."
(cons (+ (lsh (aref array (+ i 3)) 8) (aref array (+ i 2)))
(+ (lsh (aref array (+ i 1)) 8) (aref array (+ i 0)))))
(defun md5-byte (array n b)
"Unpack byte B (0 to 3) from Nth member of ARRAY of 32-bit integers."
(let ((e (aref array n)))
(cond ((eq b 0) (logand 255 (cdr e)))
((eq b 1) (lsh (cdr e) -8))
((eq b 2) (logand 255 (car e)))
((eq b 3) (lsh (car e) -8)))))
(defun md5-final ()
(let ((in (make-vector 16 (cons 0 0)))
(j 0)
(digest (make-vector 16 0))
(padding))
;; Save the number of bits in the message
(aset in 14 (cons (aref md5-bits 1) (aref md5-bits 0)))
(aset in 15 (cons (aref md5-bits 3) (aref md5-bits 2)))
;; Compute number of bytes modulo 64
(setq j (% (/ (aref md5-bits 0) 8) 64))
;; Pad out computation to 56 bytes modulo 64
(setq padding (make-vector (if (< j 56) (- 56 j) (- 120 j)) 0))
(aset padding 0 128)
(md5-update padding)
;; Append length in bits and transform
(let ((k 0) (kk 0))
(while (< k 14)
(aset in k (md5-pack md5-input kk))
(setq k (+ k 1) kk (+ kk 4))))
(md5-transform in)
;; Store the results in the digest
(let ((k 0) (kk 0))
(while (< k 4)
(aset digest (+ kk 0) (md5-byte md5-buffer k 0))
(aset digest (+ kk 1) (md5-byte md5-buffer k 1))
(aset digest (+ kk 2) (md5-byte md5-buffer k 2))
(aset digest (+ kk 3) (md5-byte md5-buffer k 3))
(setq k (+ k 1) kk (+ kk 4))))
;; Return digest
digest))
;; It says in the RSA source, "Note that if the Mysterious Constants are
;; arranged backwards in little-endian order and decrypted with the DES
;; they produce OCCULT MESSAGES!" Security through obscurity?
(defun md5-transform (in)
"Basic MD5 step. Transform md5-buffer based on array IN."
(let ((a (aref md5-buffer 0))
(b (aref md5-buffer 1))
(c (aref md5-buffer 2))
(d (aref md5-buffer 3)))
(setq
a (md5-FF a b c d (aref in 0) 7 '(55146 . 42104))
d (md5-FF d a b c (aref in 1) 12 '(59591 . 46934))
c (md5-FF c d a b (aref in 2) 17 '( 9248 . 28891))
b (md5-FF b c d a (aref in 3) 22 '(49597 . 52974))
a (md5-FF a b c d (aref in 4) 7 '(62844 . 4015))
d (md5-FF d a b c (aref in 5) 12 '(18311 . 50730))
c (md5-FF c d a b (aref in 6) 17 '(43056 . 17939))
b (md5-FF b c d a (aref in 7) 22 '(64838 . 38145))
a (md5-FF a b c d (aref in 8) 7 '(27008 . 39128))
d (md5-FF d a b c (aref in 9) 12 '(35652 . 63407))
c (md5-FF c d a b (aref in 10) 17 '(65535 . 23473))
b (md5-FF b c d a (aref in 11) 22 '(35164 . 55230))
a (md5-FF a b c d (aref in 12) 7 '(27536 . 4386))
d (md5-FF d a b c (aref in 13) 12 '(64920 . 29075))
c (md5-FF c d a b (aref in 14) 17 '(42617 . 17294))
b (md5-FF b c d a (aref in 15) 22 '(18868 . 2081))
a (md5-GG a b c d (aref in 1) 5 '(63006 . 9570))
d (md5-GG d a b c (aref in 6) 9 '(49216 . 45888))
c (md5-GG c d a b (aref in 11) 14 '( 9822 . 23121))
b (md5-GG b c d a (aref in 0) 20 '(59830 . 51114))
a (md5-GG a b c d (aref in 5) 5 '(54831 . 4189))
d (md5-GG d a b c (aref in 10) 9 '( 580 . 5203))
c (md5-GG c d a b (aref in 15) 14 '(55457 . 59009))
b (md5-GG b c d a (aref in 4) 20 '(59347 . 64456))
a (md5-GG a b c d (aref in 9) 5 '( 8673 . 52710))
d (md5-GG d a b c (aref in 14) 9 '(49975 . 2006))
c (md5-GG c d a b (aref in 3) 14 '(62677 . 3463))
b (md5-GG b c d a (aref in 8) 20 '(17754 . 5357))
a (md5-GG a b c d (aref in 13) 5 '(43491 . 59653))
d (md5-GG d a b c (aref in 2) 9 '(64751 . 41976))
c (md5-GG c d a b (aref in 7) 14 '(26479 . 729))
b (md5-GG b c d a (aref in 12) 20 '(36138 . 19594))
a (md5-HH a b c d (aref in 5) 4 '(65530 . 14658))
d (md5-HH d a b c (aref in 8) 11 '(34673 . 63105))
c (md5-HH c d a b (aref in 11) 16 '(28061 . 24866))
b (md5-HH b c d a (aref in 14) 23 '(64997 . 14348))
a (md5-HH a b c d (aref in 1) 4 '(42174 . 59972))
d (md5-HH d a b c (aref in 4) 11 '(19422 . 53161))
c (md5-HH c d a b (aref in 7) 16 '(63163 . 19296))
b (md5-HH b c d a (aref in 10) 23 '(48831 . 48240))
a (md5-HH a b c d (aref in 13) 4 '(10395 . 32454))
d (md5-HH d a b c (aref in 0) 11 '(60065 . 10234))
c (md5-HH c d a b (aref in 3) 16 '(54511 . 12421))
b (md5-HH b c d a (aref in 6) 23 '( 1160 . 7429))
a (md5-HH a b c d (aref in 9) 4 '(55764 . 53305))
d (md5-HH d a b c (aref in 12) 11 '(59099 . 39397))
c (md5-HH c d a b (aref in 15) 16 '( 8098 . 31992))
b (md5-HH b c d a (aref in 2) 23 '(50348 . 22117))
a (md5-II a b c d (aref in 0) 6 '(62505 . 8772))
d (md5-II d a b c (aref in 7) 10 '(17194 . 65431))
c (md5-II c d a b (aref in 14) 15 '(43924 . 9127))
b (md5-II b c d a (aref in 5) 21 '(64659 . 41017))
a (md5-II a b c d (aref in 12) 6 '(25947 . 22979))
d (md5-II d a b c (aref in 3) 10 '(36620 . 52370))
c (md5-II c d a b (aref in 10) 15 '(65519 . 62589))
b (md5-II b c d a (aref in 1) 21 '(34180 . 24017))
a (md5-II a b c d (aref in 8) 6 '(28584 . 32335))
d (md5-II d a b c (aref in 15) 10 '(65068 . 59104))
c (md5-II c d a b (aref in 6) 15 '(41729 . 17172))
b (md5-II b c d a (aref in 13) 21 '(19976 . 4513))
a (md5-II a b c d (aref in 4) 6 '(63315 . 32386))
d (md5-II d a b c (aref in 11) 10 '(48442 . 62005))
c (md5-II c d a b (aref in 2) 15 '(10967 . 53947))
b (md5-II b c d a (aref in 9) 21 '(60294 . 54161)))
(aset md5-buffer 0 (md5-add (aref md5-buffer 0) a))
(aset md5-buffer 1 (md5-add (aref md5-buffer 1) b))
(aset md5-buffer 2 (md5-add (aref md5-buffer 2) c))
(aset md5-buffer 3 (md5-add (aref md5-buffer 3) d))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; Here begins the merger with the XEmacs API and the md5.el from the URL
;;; package. Courtesy wmperry@cs.indiana.edu
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun md5 (object &optional start end)
"Return the MD5 (a secure message digest algorithm) of an object.
OBJECT is either a string or a buffer.
Optional arguments START and END denote buffer positions for computing the
hash of a portion of OBJECT."
(let ((buffer nil))
(unwind-protect
(save-excursion
(setq buffer (generate-new-buffer " *md5-work*"))
(set-buffer buffer)
(cond
((bufferp object)
(insert-buffer-substring object start end))
((stringp object)
(insert (if (or start end)
(substring object start end)
object)))
(t nil))
(prog1
(if (or (null md5-maximum-internal-length)
(<= (point-max) md5-maximum-internal-length))
(mapconcat
(function (lambda (node) (format "%02x" node)))
(md5-encode (buffer-string))
"")
(call-process-region (point-min) (point-max)
shell-file-name
t buffer nil
shell-command-switch md5-program)
;; MD5 digest is 32 chars long
;; mddriver adds a newline to make neaten output for tty
;; viewing, make sure we leave it behind.
(buffer-substring (point-min) (+ (point-min) 32)))
(kill-buffer buffer)))
(and buffer (buffer-name buffer) (kill-buffer buffer) nil))))
(provide 'md5-el)
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