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[emacs.git] / lisp / net / ntlm.el
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1 ;;; ntlm.el --- NTLM (NT LanManager) authentication support
2
3 ;; Copyright (C) 2001, 2007 Free Software Foundation, Inc.
4
5 ;; Author: Taro Kawagishi <tarok@transpulse.org>
6 ;; Keywords: NTLM, SASL
7 ;; Version: 1.00
8 ;; Created: February 2001
9
10 ;; This file is part of GNU Emacs.
11
12 ;; GNU Emacs is free software; you can redistribute it and/or modify
13 ;; it under the terms of the GNU General Public License as published by
14 ;; the Free Software Foundation; either version 3, or (at your option)
15 ;; any later version.
16
17 ;; GNU Emacs is distributed in the hope that it will be useful,
18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 ;; GNU General Public License for more details.
21
22 ;; You should have received a copy of the GNU General Public License
23 ;; along with GNU Emacs; see the file COPYING. If not, write to the
24 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
25 ;; Boston, MA 02110-1301, USA.
26
27 ;;; Commentary:
28
29 ;; This library is a direct translation of the Samba release 2.2.0
30 ;; implementation of Windows NT and LanManager compatible password
31 ;; encryption.
32 ;;
33 ;; Interface functions:
34 ;;
35 ;; ntlm-build-auth-request
36 ;; This will return a binary string, which should be used in the
37 ;; base64 encoded form and it is the caller's responsibility to encode
38 ;; the returned string with base64.
39 ;;
40 ;; ntlm-build-auth-response
41 ;; It is the caller's responsibility to pass a base64 decoded string
42 ;; (which will be a binary string) as the first argument and to
43 ;; encode the returned string with base64. The second argument user
44 ;; should be given in user@domain format.
45 ;;
46 ;; ntlm-get-password-hashes
47 ;;
48 ;;
49 ;; NTLM authentication procedure example:
50 ;;
51 ;; 1. Open a network connection to the Exchange server at the IMAP port (143)
52 ;; 2. Receive an opening message such as:
53 ;; "* OK Microsoft Exchange IMAP4rev1 server version 5.5.2653.7 (XXXX) ready"
54 ;; 3. Ask for IMAP server capability by sending "NNN capability"
55 ;; 4. Receive a capability message such as:
56 ;; "* CAPABILITY IMAP4 IMAP4rev1 IDLE LITERAL+ LOGIN-REFERRALS MAILBOX-REFERRALS NAMESPACE AUTH=NTLM"
57 ;; 5. Ask for NTLM authentication by sending a string
58 ;; "NNN authenticate ntlm"
59 ;; 6. Receive continuation acknowledgment "+"
60 ;; 7. Send NTLM authentication request generated by 'ntlm-build-auth-request
61 ;; 8. Receive NTLM challenge string following acknowledgment "+"
62 ;; 9. Generate response to challenge by 'ntlm-build-auth-response
63 ;; (here two hash function values of the user password are encrypted)
64 ;; 10. Receive authentication completion message such as
65 ;; "NNN OK AUTHENTICATE NTLM completed."
66
67 ;;; Code:
68
69 (require 'md4)
70
71 ;;;
72 ;;; NTLM authentication interface functions
73
74 (defun ntlm-build-auth-request (user &optional domain)
75 "Return the NTLM authentication request string for USER and DOMAIN.
76 USER is a string representing a user name to be authenticated and
77 DOMAIN is a NT domain. USER can include a NT domain part as in
78 user@domain where the string after @ is used as the domain if DOMAIN
79 is not given."
80 (interactive)
81 (let ((request-ident (concat "NTLMSSP" (make-string 1 0)))
82 (request-msgType (concat (make-string 1 1) (make-string 3 0)))
83 ;0x01 0x00 0x00 0x00
84 (request-flags (concat (make-string 1 7) (make-string 1 178)
85 (make-string 2 0)))
86 ;0x07 0xb2 0x00 0x00
87 lu ld off-d off-u)
88 (when (string-match "@" user)
89 (unless domain
90 (setq domain (substring user (1+ (match-beginning 0)))))
91 (setq user (substring user 0 (match-beginning 0))))
92 ;; set fields offsets within the request struct
93 (setq lu (length user))
94 (setq ld (length domain))
95 (setq off-u 32) ;offset to the string 'user
96 (setq off-d (+ 32 lu)) ;offset to the string 'domain
97 ;; pack the request struct in a string
98 (concat request-ident ;8 bytes
99 request-msgType ;4 bytes
100 request-flags ;4 bytes
101 (md4-pack-int16 lu) ;user field, count field
102 (md4-pack-int16 lu) ;user field, max count field
103 (md4-pack-int32 (cons 0 off-u)) ;user field, offset field
104 (md4-pack-int16 ld) ;domain field, count field
105 (md4-pack-int16 ld) ;domain field, max count field
106 (md4-pack-int32 (cons 0 off-d)) ;domain field, offset field
107 user ;bufer field
108 domain ;bufer field
109 )))
110
111 (eval-when-compile
112 (defmacro ntlm-string-as-unibyte (string)
113 (if (fboundp 'string-as-unibyte)
114 `(string-as-unibyte ,string)
115 string)))
116
117 (defun ntlm-build-auth-response (challenge user password-hashes)
118 "Return the response string to a challenge string CHALLENGE given by
119 the NTLM based server for the user USER and the password hash list
120 PASSWORD-HASHES. NTLM uses two hash values which are represented
121 by PASSWORD-HASHES. PASSWORD-HASHES should be a return value of
122 (list (ntlm-smb-passwd-hash password) (ntlm-md4hash password))"
123 (let* ((rchallenge (ntlm-string-as-unibyte challenge))
124 ;; get fields within challenge struct
125 ;;(ident (substring rchallenge 0 8)) ;ident, 8 bytes
126 ;;(msgType (substring rchallenge 8 12)) ;msgType, 4 bytes
127 (uDomain (substring rchallenge 12 20)) ;uDomain, 8 bytes
128 (flags (substring rchallenge 20 24)) ;flags, 4 bytes
129 (challengeData (substring rchallenge 24 32)) ;challengeData, 8 bytes
130 uDomain-len uDomain-offs
131 ;; response struct and its fields
132 lmRespData ;lmRespData, 24 bytes
133 ntRespData ;ntRespData, 24 bytes
134 domain ;ascii domain string
135 lu ld off-lm off-nt off-d off-u off-w off-s)
136 ;; extract domain string from challenge string
137 (setq uDomain-len (md4-unpack-int16 (substring uDomain 0 2)))
138 (setq uDomain-offs (md4-unpack-int32 (substring uDomain 4 8)))
139 (setq domain
140 (ntlm-unicode2ascii (substring challenge
141 (cdr uDomain-offs)
142 (+ (cdr uDomain-offs) uDomain-len))
143 (/ uDomain-len 2)))
144 ;; overwrite domain in case user is given in <user>@<domain> format
145 (when (string-match "@" user)
146 (setq domain (substring user (1+ (match-beginning 0))))
147 (setq user (substring user 0 (match-beginning 0))))
148
149 ;; generate response data
150 (setq lmRespData
151 (ntlm-smb-owf-encrypt (car password-hashes) challengeData))
152 (setq ntRespData
153 (ntlm-smb-owf-encrypt (cadr password-hashes) challengeData))
154
155 ;; get offsets to fields to pack the response struct in a string
156 (setq lu (length user))
157 (setq ld (length domain))
158 (setq off-lm 64) ;offset to string 'lmResponse
159 (setq off-nt (+ 64 24)) ;offset to string 'ntResponse
160 (setq off-d (+ 64 48)) ;offset to string 'uDomain
161 (setq off-u (+ 64 48 (* 2 ld))) ;offset to string 'uUser
162 (setq off-w (+ 64 48 (* 2 (+ ld lu)))) ;offset to string 'uWks
163 (setq off-s (+ 64 48 (* 2 (+ ld lu lu)))) ;offset to string 'sessionKey
164 ;; pack the response struct in a string
165 (concat "NTLMSSP\0" ;response ident field, 8 bytes
166 (md4-pack-int32 '(0 . 3)) ;response msgType field, 4 bytes
167
168 ;; lmResponse field, 8 bytes
169 ;;AddBytes(response,lmResponse,lmRespData,24);
170 (md4-pack-int16 24) ;len field
171 (md4-pack-int16 24) ;maxlen field
172 (md4-pack-int32 (cons 0 off-lm)) ;field offset
173
174 ;; ntResponse field, 8 bytes
175 ;;AddBytes(response,ntResponse,ntRespData,24);
176 (md4-pack-int16 24) ;len field
177 (md4-pack-int16 24) ;maxlen field
178 (md4-pack-int32 (cons 0 off-nt)) ;field offset
179
180 ;; uDomain field, 8 bytes
181 ;;AddUnicodeString(response,uDomain,domain);
182 ;;AddBytes(response, uDomain, udomain, 2*ld);
183 (md4-pack-int16 (* 2 ld)) ;len field
184 (md4-pack-int16 (* 2 ld)) ;maxlen field
185 (md4-pack-int32 (cons 0 off-d)) ;field offset
186
187 ;; uUser field, 8 bytes
188 ;;AddUnicodeString(response,uUser,u);
189 ;;AddBytes(response, uUser, uuser, 2*lu);
190 (md4-pack-int16 (* 2 lu)) ;len field
191 (md4-pack-int16 (* 2 lu)) ;maxlen field
192 (md4-pack-int32 (cons 0 off-u)) ;field offset
193
194 ;; uWks field, 8 bytes
195 ;;AddUnicodeString(response,uWks,u);
196 (md4-pack-int16 (* 2 lu)) ;len field
197 (md4-pack-int16 (* 2 lu)) ;maxlen field
198 (md4-pack-int32 (cons 0 off-w)) ;field offset
199
200 ;; sessionKey field, 8 bytes
201 ;;AddString(response,sessionKey,NULL);
202 (md4-pack-int16 0) ;len field
203 (md4-pack-int16 0) ;maxlen field
204 (md4-pack-int32 (cons 0 (- off-s off-lm))) ;field offset
205
206 ;; flags field, 4 bytes
207 flags ;
208
209 ;; buffer field
210 lmRespData ;lmResponse, 24 bytes
211 ntRespData ;ntResponse, 24 bytes
212 (ntlm-ascii2unicode domain ;unicode domain string, 2*ld bytes
213 (length domain)) ;
214 (ntlm-ascii2unicode user ;unicode user string, 2*lu bytes
215 (length user)) ;
216 (ntlm-ascii2unicode user ;unicode user string, 2*lu bytes
217 (length user)) ;
218 )))
219
220 (defun ntlm-get-password-hashes (password)
221 "Return a pair of SMB hash and NT MD4 hash of the given password PASSWORD"
222 (list (ntlm-smb-passwd-hash password)
223 (ntlm-md4hash password)))
224
225 (defun ntlm-ascii2unicode (str len)
226 "Convert an ASCII string into a NT Unicode string, which is
227 little-endian utf16."
228 (let ((utf (make-string (* 2 len) 0)) (i 0) val)
229 (while (and (< i len)
230 (not (zerop (setq val (aref str i)))))
231 (aset utf (* 2 i) val)
232 (aset utf (1+ (* 2 i)) 0)
233 (setq i (1+ i)))
234 utf))
235
236 (defun ntlm-unicode2ascii (str len)
237 "Extract 7 bits ASCII part of a little endian utf16 string STR of length LEN."
238 (let ((buf (make-string len 0)) (i 0) (j 0))
239 (while (< i len)
240 (aset buf i (logand (aref str j) 127)) ;(string-to-number "7f" 16)
241 (setq i (1+ i)
242 j (+ 2 j)))
243 buf))
244
245 (defun ntlm-smb-passwd-hash (passwd)
246 "Return the SMB password hash string of 16 bytes long for the given password
247 string PASSWD. PASSWD is truncated to 14 bytes if longer."
248 (let ((len (min (length passwd) 14)))
249 (ntlm-smb-des-e-p16
250 (concat (substring (upcase passwd) 0 len) ;fill top 14 bytes with passwd
251 (make-string (- 15 len) 0)))))
252
253 (defun ntlm-smb-owf-encrypt (passwd c8)
254 "Return the response string of 24 bytes long for the given password
255 string PASSWD based on the DES encryption. PASSWD is of at most 14
256 bytes long and the challenge string C8 of 8 bytes long."
257 (let ((len (min (length passwd) 16)) p22)
258 (setq p22 (concat (substring passwd 0 len) ;fill top 16 bytes with passwd
259 (make-string (- 22 len) 0)))
260 (ntlm-smb-des-e-p24 p22 c8)))
261
262 (defun ntlm-smb-des-e-p24 (p22 c8)
263 "Return a 24 bytes hashed string for a 21 bytes string P22 and a 8 bytes
264 string C8."
265 (concat (ntlm-smb-hash c8 p22 t) ;hash first 8 bytes of p22
266 (ntlm-smb-hash c8 (substring p22 7) t)
267 (ntlm-smb-hash c8 (substring p22 14) t)))
268
269 (defconst ntlm-smb-sp8 [75 71 83 33 64 35 36 37])
270
271 (defun ntlm-smb-des-e-p16 (p15)
272 "Return a 16 bytes hashed string for a 15 bytes string P15."
273 (concat (ntlm-smb-hash ntlm-smb-sp8 p15 t) ;hash of first 8 bytes of p15
274 (ntlm-smb-hash ntlm-smb-sp8 ;hash of last 8 bytes of p15
275 (substring p15 7) t)))
276
277 (defun ntlm-smb-hash (in key forw)
278 "Return the hash string of length 8 for a string IN of length 8 and
279 a string KEY of length 8. FORW is t or nil."
280 (let ((out (make-string 8 0))
281 outb ;string of length 64
282 (inb (make-string 64 0))
283 (keyb (make-string 64 0))
284 (key2 (ntlm-smb-str-to-key key))
285 (i 0) aa)
286 (while (< i 64)
287 (unless (zerop (logand (aref in (/ i 8)) (lsh 1 (- 7 (% i 8)))))
288 (aset inb i 1))
289 (unless (zerop (logand (aref key2 (/ i 8)) (lsh 1 (- 7 (% i 8)))))
290 (aset keyb i 1))
291 (setq i (1+ i)))
292 (setq outb (ntlm-smb-dohash inb keyb forw))
293 (setq i 0)
294 (while (< i 64)
295 (unless (zerop (aref outb i))
296 (setq aa (aref out (/ i 8)))
297 (aset out (/ i 8)
298 (logior aa (lsh 1 (- 7 (% i 8))))))
299 (setq i (1+ i)))
300 out))
301
302 (defun ntlm-smb-str-to-key (str)
303 "Return a string of length 8 for the given string STR of length 7."
304 (let ((key (make-string 8 0))
305 (i 7))
306 (aset key 0 (lsh (aref str 0) -1))
307 (aset key 1 (logior
308 (lsh (logand (aref str 0) 1) 6)
309 (lsh (aref str 1) -2)))
310 (aset key 2 (logior
311 (lsh (logand (aref str 1) 3) 5)
312 (lsh (aref str 2) -3)))
313 (aset key 3 (logior
314 (lsh (logand (aref str 2) 7) 4)
315 (lsh (aref str 3) -4)))
316 (aset key 4 (logior
317 (lsh (logand (aref str 3) 15) 3)
318 (lsh (aref str 4) -5)))
319 (aset key 5 (logior
320 (lsh (logand (aref str 4) 31) 2)
321 (lsh (aref str 5) -6)))
322 (aset key 6 (logior
323 (lsh (logand (aref str 5) 63) 1)
324 (lsh (aref str 6) -7)))
325 (aset key 7 (logand (aref str 6) 127))
326 (while (>= i 0)
327 (aset key i (lsh (aref key i) 1))
328 (setq i (1- i)))
329 key))
330
331 (defconst ntlm-smb-perm1 [57 49 41 33 25 17 9
332 1 58 50 42 34 26 18
333 10 2 59 51 43 35 27
334 19 11 3 60 52 44 36
335 63 55 47 39 31 23 15
336 7 62 54 46 38 30 22
337 14 6 61 53 45 37 29
338 21 13 5 28 20 12 4])
339
340 (defconst ntlm-smb-perm2 [14 17 11 24 1 5
341 3 28 15 6 21 10
342 23 19 12 4 26 8
343 16 7 27 20 13 2
344 41 52 31 37 47 55
345 30 40 51 45 33 48
346 44 49 39 56 34 53
347 46 42 50 36 29 32])
348
349 (defconst ntlm-smb-perm3 [58 50 42 34 26 18 10 2
350 60 52 44 36 28 20 12 4
351 62 54 46 38 30 22 14 6
352 64 56 48 40 32 24 16 8
353 57 49 41 33 25 17 9 1
354 59 51 43 35 27 19 11 3
355 61 53 45 37 29 21 13 5
356 63 55 47 39 31 23 15 7])
357
358 (defconst ntlm-smb-perm4 [32 1 2 3 4 5
359 4 5 6 7 8 9
360 8 9 10 11 12 13
361 12 13 14 15 16 17
362 16 17 18 19 20 21
363 20 21 22 23 24 25
364 24 25 26 27 28 29
365 28 29 30 31 32 1])
366
367 (defconst ntlm-smb-perm5 [16 7 20 21
368 29 12 28 17
369 1 15 23 26
370 5 18 31 10
371 2 8 24 14
372 32 27 3 9
373 19 13 30 6
374 22 11 4 25])
375
376 (defconst ntlm-smb-perm6 [40 8 48 16 56 24 64 32
377 39 7 47 15 55 23 63 31
378 38 6 46 14 54 22 62 30
379 37 5 45 13 53 21 61 29
380 36 4 44 12 52 20 60 28
381 35 3 43 11 51 19 59 27
382 34 2 42 10 50 18 58 26
383 33 1 41 9 49 17 57 25])
384
385 (defconst ntlm-smb-sc [1 1 2 2 2 2 2 2 1 2 2 2 2 2 2 1])
386
387 (defconst ntlm-smb-sbox [[[14 4 13 1 2 15 11 8 3 10 6 12 5 9 0 7]
388 [ 0 15 7 4 14 2 13 1 10 6 12 11 9 5 3 8]
389 [ 4 1 14 8 13 6 2 11 15 12 9 7 3 10 5 0]
390 [15 12 8 2 4 9 1 7 5 11 3 14 10 0 6 13]]
391 [[15 1 8 14 6 11 3 4 9 7 2 13 12 0 5 10]
392 [ 3 13 4 7 15 2 8 14 12 0 1 10 6 9 11 5]
393 [ 0 14 7 11 10 4 13 1 5 8 12 6 9 3 2 15]
394 [13 8 10 1 3 15 4 2 11 6 7 12 0 5 14 9]]
395 [[10 0 9 14 6 3 15 5 1 13 12 7 11 4 2 8]
396 [13 7 0 9 3 4 6 10 2 8 5 14 12 11 15 1]
397 [13 6 4 9 8 15 3 0 11 1 2 12 5 10 14 7]
398 [ 1 10 13 0 6 9 8 7 4 15 14 3 11 5 2 12]]
399 [[ 7 13 14 3 0 6 9 10 1 2 8 5 11 12 4 15]
400 [13 8 11 5 6 15 0 3 4 7 2 12 1 10 14 9]
401 [10 6 9 0 12 11 7 13 15 1 3 14 5 2 8 4]
402 [ 3 15 0 6 10 1 13 8 9 4 5 11 12 7 2 14]]
403 [[ 2 12 4 1 7 10 11 6 8 5 3 15 13 0 14 9]
404 [14 11 2 12 4 7 13 1 5 0 15 10 3 9 8 6]
405 [ 4 2 1 11 10 13 7 8 15 9 12 5 6 3 0 14]
406 [11 8 12 7 1 14 2 13 6 15 0 9 10 4 5 3]]
407 [[12 1 10 15 9 2 6 8 0 13 3 4 14 7 5 11]
408 [10 15 4 2 7 12 9 5 6 1 13 14 0 11 3 8]
409 [ 9 14 15 5 2 8 12 3 7 0 4 10 1 13 11 6]
410 [ 4 3 2 12 9 5 15 10 11 14 1 7 6 0 8 13]]
411 [[ 4 11 2 14 15 0 8 13 3 12 9 7 5 10 6 1]
412 [13 0 11 7 4 9 1 10 14 3 5 12 2 15 8 6]
413 [ 1 4 11 13 12 3 7 14 10 15 6 8 0 5 9 2]
414 [ 6 11 13 8 1 4 10 7 9 5 0 15 14 2 3 12]]
415 [[13 2 8 4 6 15 11 1 10 9 3 14 5 0 12 7]
416 [ 1 15 13 8 10 3 7 4 12 5 6 11 0 14 9 2]
417 [ 7 11 4 1 9 12 14 2 0 6 10 13 15 3 5 8]
418 [ 2 1 14 7 4 10 8 13 15 12 9 0 3 5 6 11]]])
419
420 (defsubst ntlm-string-permute (in perm n)
421 "Return a string of length N for a string IN and a permutation vector
422 PERM of size N. The length of IN should be height of PERM."
423 (let ((i 0) (out (make-string n 0)))
424 (while (< i n)
425 (aset out i (aref in (- (aref perm i) 1)))
426 (setq i (1+ i)))
427 out))
428
429 (defsubst ntlm-string-lshift (str count len)
430 "Return a string by circularly shifting a string STR by COUNT to the left.
431 length of STR is LEN."
432 (let ((c (% count len)))
433 (concat (substring str c len) (substring str 0 c))))
434
435 (defsubst ntlm-string-xor (in1 in2 n)
436 "Return exclusive-or of sequences in1 and in2"
437 (let ((w (make-string n 0)) (i 0))
438 (while (< i n)
439 (aset w i (logxor (aref in1 i) (aref in2 i)))
440 (setq i (1+ i)))
441 w))
442
443 (defun ntlm-smb-dohash (in key forw)
444 "Return the hash value for a string IN and a string KEY.
445 Length of IN and KEY are 64. FORW non nill means forward, nil means
446 backward."
447 (let (pk1 ;string of length 56
448 c ;string of length 28
449 d ;string of length 28
450 cd ;string of length 56
451 (ki (make-vector 16 0)) ;vector of string of length 48
452 pd1 ;string of length 64
453 l ;string of length 32
454 r ;string of length 32
455 rl ;string of length 64
456 (i 0) (j 0) (k 0))
457 (setq pk1 (ntlm-string-permute key ntlm-smb-perm1 56))
458 (setq c (substring pk1 0 28))
459 (setq d (substring pk1 28 56))
460
461 (setq i 0)
462 (while (< i 16)
463 (setq c (ntlm-string-lshift c (aref ntlm-smb-sc i) 28))
464 (setq d (ntlm-string-lshift d (aref ntlm-smb-sc i) 28))
465 (setq cd (concat (substring c 0 28) (substring d 0 28)))
466 (aset ki i (ntlm-string-permute cd ntlm-smb-perm2 48))
467 (setq i (1+ i)))
468
469 (setq pd1 (ntlm-string-permute in ntlm-smb-perm3 64))
470
471 (setq l (substring pd1 0 32))
472 (setq r (substring pd1 32 64))
473
474 (setq i 0)
475 (let (er ;string of length 48
476 erk ;string of length 48
477 (b (make-vector 8 0)) ;vector of strings of length 6
478 cb ;string of length 32
479 pcb ;string of length 32
480 r2 ;string of length 32
481 jj m n bj sbox-jmn)
482 (while (< i 16)
483 (setq er (ntlm-string-permute r ntlm-smb-perm4 48))
484 (setq erk (ntlm-string-xor er
485 (aref ki (if forw i (- 15 i)))
486 48))
487 (setq j 0)
488 (while (< j 8)
489 (setq jj (* 6 j))
490 (aset b j (substring erk jj (+ jj 6)))
491 (setq j (1+ j)))
492 (setq j 0)
493 (while (< j 8)
494 (setq bj (aref b j))
495 (setq m (logior (lsh (aref bj 0) 1) (aref bj 5)))
496 (setq n (logior (lsh (aref bj 1) 3)
497 (lsh (aref bj 2) 2)
498 (lsh (aref bj 3) 1)
499 (aref bj 4)))
500 (setq k 0)
501 (setq sbox-jmn (aref (aref (aref ntlm-smb-sbox j) m) n))
502 (while (< k 4)
503 (aset bj k
504 (if (zerop (logand sbox-jmn (lsh 1 (- 3 k))))
505 0 1))
506 (setq k (1+ k)))
507 (setq j (1+ j)))
508
509 (setq j 0)
510 (setq cb nil)
511 (while (< j 8)
512 (setq cb (concat cb (substring (aref b j) 0 4)))
513 (setq j (1+ j)))
514
515 (setq pcb (ntlm-string-permute cb ntlm-smb-perm5 32))
516 (setq r2 (ntlm-string-xor l pcb 32))
517 (setq l r)
518 (setq r r2)
519 (setq i (1+ i))))
520 (setq rl (concat r l))
521 (ntlm-string-permute rl ntlm-smb-perm6 64)))
522
523 (defun ntlm-md4hash (passwd)
524 "Return the 16 bytes MD4 hash of a string PASSWD after converting it
525 into a Unicode string. PASSWD is truncated to 128 bytes if longer."
526 (let (len wpwd)
527 ;; Password cannot be longer than 128 characters
528 (setq len (length passwd))
529 (if (> len 128)
530 (setq len 128))
531 ;; Password must be converted to NT unicode
532 (setq wpwd (ntlm-ascii2unicode passwd len))
533 ;; Calculate length in bytes
534 (setq len (* len 2))
535 (md4 wpwd len)))
536
537 (provide 'ntlm)
538
539 ;;; arch-tag: 348ace18-f8e2-4176-8fe9-d9ab4e96f296
540 ;;; ntlm.el ends here
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