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(define-ccl-program): Add `doc-string' declaration.
[emacs.git] / lisp / net / ntlm.el
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1 ;;; ntlm.el --- NTLM (NT LanManager) authentication support
2
3 ;; Copyright (C) 2001, 2007, 2008 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 of the License, or
15 ;; (at your option) 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. If not, see <http://www.gnu.org/licenses/>.
24
25 ;;; Commentary:
26
27 ;; This library is a direct translation of the Samba release 2.2.0
28 ;; implementation of Windows NT and LanManager compatible password
29 ;; encryption.
30 ;;
31 ;; Interface functions:
32 ;;
33 ;; ntlm-build-auth-request
34 ;; This will return a binary string, which should be used in the
35 ;; base64 encoded form and it is the caller's responsibility to encode
36 ;; the returned string with base64.
37 ;;
38 ;; ntlm-build-auth-response
39 ;; It is the caller's responsibility to pass a base64 decoded string
40 ;; (which will be a binary string) as the first argument and to
41 ;; encode the returned string with base64. The second argument user
42 ;; should be given in user@domain format.
43 ;;
44 ;; ntlm-get-password-hashes
45 ;;
46 ;;
47 ;; NTLM authentication procedure example:
48 ;;
49 ;; 1. Open a network connection to the Exchange server at the IMAP port (143)
50 ;; 2. Receive an opening message such as:
51 ;; "* OK Microsoft Exchange IMAP4rev1 server version 5.5.2653.7 (XXXX) ready"
52 ;; 3. Ask for IMAP server capability by sending "NNN capability"
53 ;; 4. Receive a capability message such as:
54 ;; "* CAPABILITY IMAP4 IMAP4rev1 IDLE LITERAL+ LOGIN-REFERRALS MAILBOX-REFERRALS NAMESPACE AUTH=NTLM"
55 ;; 5. Ask for NTLM authentication by sending a string
56 ;; "NNN authenticate ntlm"
57 ;; 6. Receive continuation acknowledgment "+"
58 ;; 7. Send NTLM authentication request generated by 'ntlm-build-auth-request
59 ;; 8. Receive NTLM challenge string following acknowledgment "+"
60 ;; 9. Generate response to challenge by 'ntlm-build-auth-response
61 ;; (here two hash function values of the user password are encrypted)
62 ;; 10. Receive authentication completion message such as
63 ;; "NNN OK AUTHENTICATE NTLM completed."
64
65 ;;; Code:
66
67 (require 'md4)
68
69 ;;;
70 ;;; NTLM authentication interface functions
71
72 (defun ntlm-build-auth-request (user &optional domain)
73 "Return the NTLM authentication request string for USER and DOMAIN.
74 USER is a string representing a user name to be authenticated and
75 DOMAIN is a NT domain. USER can include a NT domain part as in
76 user@domain where the string after @ is used as the domain if DOMAIN
77 is not given."
78 (interactive)
79 (let ((request-ident (concat "NTLMSSP" (make-string 1 0)))
80 (request-msgType (concat (make-string 1 1) (make-string 3 0)))
81 ;0x01 0x00 0x00 0x00
82 (request-flags (concat (make-string 1 7) (make-string 1 178)
83 (make-string 2 0)))
84 ;0x07 0xb2 0x00 0x00
85 lu ld off-d off-u)
86 (when (string-match "@" user)
87 (unless domain
88 (setq domain (substring user (1+ (match-beginning 0)))))
89 (setq user (substring user 0 (match-beginning 0))))
90 ;; set fields offsets within the request struct
91 (setq lu (length user))
92 (setq ld (length domain))
93 (setq off-u 32) ;offset to the string 'user
94 (setq off-d (+ 32 lu)) ;offset to the string 'domain
95 ;; pack the request struct in a string
96 (concat request-ident ;8 bytes
97 request-msgType ;4 bytes
98 request-flags ;4 bytes
99 (md4-pack-int16 lu) ;user field, count field
100 (md4-pack-int16 lu) ;user field, max count field
101 (md4-pack-int32 (cons 0 off-u)) ;user field, offset field
102 (md4-pack-int16 ld) ;domain field, count field
103 (md4-pack-int16 ld) ;domain field, max count field
104 (md4-pack-int32 (cons 0 off-d)) ;domain field, offset field
105 user ;bufer field
106 domain ;bufer field
107 )))
108
109 (eval-when-compile
110 (defmacro ntlm-string-as-unibyte (string)
111 (if (fboundp 'string-as-unibyte)
112 `(string-as-unibyte ,string)
113 string)))
114
115 (defun ntlm-build-auth-response (challenge user password-hashes)
116 "Return the response string to a challenge string CHALLENGE given by
117 the NTLM based server for the user USER and the password hash list
118 PASSWORD-HASHES. NTLM uses two hash values which are represented
119 by PASSWORD-HASHES. PASSWORD-HASHES should be a return value of
120 (list (ntlm-smb-passwd-hash password) (ntlm-md4hash password))"
121 (let* ((rchallenge (ntlm-string-as-unibyte challenge))
122 ;; get fields within challenge struct
123 ;;(ident (substring rchallenge 0 8)) ;ident, 8 bytes
124 ;;(msgType (substring rchallenge 8 12)) ;msgType, 4 bytes
125 (uDomain (substring rchallenge 12 20)) ;uDomain, 8 bytes
126 (flags (substring rchallenge 20 24)) ;flags, 4 bytes
127 (challengeData (substring rchallenge 24 32)) ;challengeData, 8 bytes
128 uDomain-len uDomain-offs
129 ;; response struct and its fields
130 lmRespData ;lmRespData, 24 bytes
131 ntRespData ;ntRespData, 24 bytes
132 domain ;ascii domain string
133 lu ld off-lm off-nt off-d off-u off-w off-s)
134 ;; extract domain string from challenge string
135 (setq uDomain-len (md4-unpack-int16 (substring uDomain 0 2)))
136 (setq uDomain-offs (md4-unpack-int32 (substring uDomain 4 8)))
137 (setq domain
138 (ntlm-unicode2ascii (substring challenge
139 (cdr uDomain-offs)
140 (+ (cdr uDomain-offs) uDomain-len))
141 (/ uDomain-len 2)))
142 ;; overwrite domain in case user is given in <user>@<domain> format
143 (when (string-match "@" user)
144 (setq domain (substring user (1+ (match-beginning 0))))
145 (setq user (substring user 0 (match-beginning 0))))
146
147 ;; generate response data
148 (setq lmRespData
149 (ntlm-smb-owf-encrypt (car password-hashes) challengeData))
150 (setq ntRespData
151 (ntlm-smb-owf-encrypt (cadr password-hashes) challengeData))
152
153 ;; get offsets to fields to pack the response struct in a string
154 (setq lu (length user))
155 (setq ld (length domain))
156 (setq off-lm 64) ;offset to string 'lmResponse
157 (setq off-nt (+ 64 24)) ;offset to string 'ntResponse
158 (setq off-d (+ 64 48)) ;offset to string 'uDomain
159 (setq off-u (+ 64 48 (* 2 ld))) ;offset to string 'uUser
160 (setq off-w (+ 64 48 (* 2 (+ ld lu)))) ;offset to string 'uWks
161 (setq off-s (+ 64 48 (* 2 (+ ld lu lu)))) ;offset to string 'sessionKey
162 ;; pack the response struct in a string
163 (concat "NTLMSSP\0" ;response ident field, 8 bytes
164 (md4-pack-int32 '(0 . 3)) ;response msgType field, 4 bytes
165
166 ;; lmResponse field, 8 bytes
167 ;;AddBytes(response,lmResponse,lmRespData,24);
168 (md4-pack-int16 24) ;len field
169 (md4-pack-int16 24) ;maxlen field
170 (md4-pack-int32 (cons 0 off-lm)) ;field offset
171
172 ;; ntResponse field, 8 bytes
173 ;;AddBytes(response,ntResponse,ntRespData,24);
174 (md4-pack-int16 24) ;len field
175 (md4-pack-int16 24) ;maxlen field
176 (md4-pack-int32 (cons 0 off-nt)) ;field offset
177
178 ;; uDomain field, 8 bytes
179 ;;AddUnicodeString(response,uDomain,domain);
180 ;;AddBytes(response, uDomain, udomain, 2*ld);
181 (md4-pack-int16 (* 2 ld)) ;len field
182 (md4-pack-int16 (* 2 ld)) ;maxlen field
183 (md4-pack-int32 (cons 0 off-d)) ;field offset
184
185 ;; uUser field, 8 bytes
186 ;;AddUnicodeString(response,uUser,u);
187 ;;AddBytes(response, uUser, uuser, 2*lu);
188 (md4-pack-int16 (* 2 lu)) ;len field
189 (md4-pack-int16 (* 2 lu)) ;maxlen field
190 (md4-pack-int32 (cons 0 off-u)) ;field offset
191
192 ;; uWks field, 8 bytes
193 ;;AddUnicodeString(response,uWks,u);
194 (md4-pack-int16 (* 2 lu)) ;len field
195 (md4-pack-int16 (* 2 lu)) ;maxlen field
196 (md4-pack-int32 (cons 0 off-w)) ;field offset
197
198 ;; sessionKey field, 8 bytes
199 ;;AddString(response,sessionKey,NULL);
200 (md4-pack-int16 0) ;len field
201 (md4-pack-int16 0) ;maxlen field
202 (md4-pack-int32 (cons 0 (- off-s off-lm))) ;field offset
203
204 ;; flags field, 4 bytes
205 flags ;
206
207 ;; buffer field
208 lmRespData ;lmResponse, 24 bytes
209 ntRespData ;ntResponse, 24 bytes
210 (ntlm-ascii2unicode domain ;unicode domain string, 2*ld bytes
211 (length domain)) ;
212 (ntlm-ascii2unicode user ;unicode user string, 2*lu bytes
213 (length user)) ;
214 (ntlm-ascii2unicode user ;unicode user string, 2*lu bytes
215 (length user)) ;
216 )))
217
218 (defun ntlm-get-password-hashes (password)
219 "Return a pair of SMB hash and NT MD4 hash of the given password PASSWORD"
220 (list (ntlm-smb-passwd-hash password)
221 (ntlm-md4hash password)))
222
223 (defun ntlm-ascii2unicode (str len)
224 "Convert an ASCII string into a NT Unicode string, which is
225 little-endian utf16."
226 (let ((utf (make-string (* 2 len) 0)) (i 0) val)
227 (while (and (< i len)
228 (not (zerop (setq val (aref str i)))))
229 (aset utf (* 2 i) val)
230 (aset utf (1+ (* 2 i)) 0)
231 (setq i (1+ i)))
232 utf))
233
234 (defun ntlm-unicode2ascii (str len)
235 "Extract 7 bits ASCII part of a little endian utf16 string STR of length LEN."
236 (let ((buf (make-string len 0)) (i 0) (j 0))
237 (while (< i len)
238 (aset buf i (logand (aref str j) 127)) ;(string-to-number "7f" 16)
239 (setq i (1+ i)
240 j (+ 2 j)))
241 buf))
242
243 (defun ntlm-smb-passwd-hash (passwd)
244 "Return the SMB password hash string of 16 bytes long for the given password
245 string PASSWD. PASSWD is truncated to 14 bytes if longer."
246 (let ((len (min (length passwd) 14)))
247 (ntlm-smb-des-e-p16
248 (concat (substring (upcase passwd) 0 len) ;fill top 14 bytes with passwd
249 (make-string (- 15 len) 0)))))
250
251 (defun ntlm-smb-owf-encrypt (passwd c8)
252 "Return the response string of 24 bytes long for the given password
253 string PASSWD based on the DES encryption. PASSWD is of at most 14
254 bytes long and the challenge string C8 of 8 bytes long."
255 (let ((len (min (length passwd) 16)) p22)
256 (setq p22 (concat (substring passwd 0 len) ;fill top 16 bytes with passwd
257 (make-string (- 22 len) 0)))
258 (ntlm-smb-des-e-p24 p22 c8)))
259
260 (defun ntlm-smb-des-e-p24 (p22 c8)
261 "Return a 24 bytes hashed string for a 21 bytes string P22 and a 8 bytes
262 string C8."
263 (concat (ntlm-smb-hash c8 p22 t) ;hash first 8 bytes of p22
264 (ntlm-smb-hash c8 (substring p22 7) t)
265 (ntlm-smb-hash c8 (substring p22 14) t)))
266
267 (defconst ntlm-smb-sp8 [75 71 83 33 64 35 36 37])
268
269 (defun ntlm-smb-des-e-p16 (p15)
270 "Return a 16 bytes hashed string for a 15 bytes string P15."
271 (concat (ntlm-smb-hash ntlm-smb-sp8 p15 t) ;hash of first 8 bytes of p15
272 (ntlm-smb-hash ntlm-smb-sp8 ;hash of last 8 bytes of p15
273 (substring p15 7) t)))
274
275 (defun ntlm-smb-hash (in key forw)
276 "Return the hash string of length 8 for a string IN of length 8 and
277 a string KEY of length 8. FORW is t or nil."
278 (let ((out (make-string 8 0))
279 outb ;string of length 64
280 (inb (make-string 64 0))
281 (keyb (make-string 64 0))
282 (key2 (ntlm-smb-str-to-key key))
283 (i 0) aa)
284 (while (< i 64)
285 (unless (zerop (logand (aref in (/ i 8)) (lsh 1 (- 7 (% i 8)))))
286 (aset inb i 1))
287 (unless (zerop (logand (aref key2 (/ i 8)) (lsh 1 (- 7 (% i 8)))))
288 (aset keyb i 1))
289 (setq i (1+ i)))
290 (setq outb (ntlm-smb-dohash inb keyb forw))
291 (setq i 0)
292 (while (< i 64)
293 (unless (zerop (aref outb i))
294 (setq aa (aref out (/ i 8)))
295 (aset out (/ i 8)
296 (logior aa (lsh 1 (- 7 (% i 8))))))
297 (setq i (1+ i)))
298 out))
299
300 (defun ntlm-smb-str-to-key (str)
301 "Return a string of length 8 for the given string STR of length 7."
302 (let ((key (make-string 8 0))
303 (i 7))
304 (aset key 0 (lsh (aref str 0) -1))
305 (aset key 1 (logior
306 (lsh (logand (aref str 0) 1) 6)
307 (lsh (aref str 1) -2)))
308 (aset key 2 (logior
309 (lsh (logand (aref str 1) 3) 5)
310 (lsh (aref str 2) -3)))
311 (aset key 3 (logior
312 (lsh (logand (aref str 2) 7) 4)
313 (lsh (aref str 3) -4)))
314 (aset key 4 (logior
315 (lsh (logand (aref str 3) 15) 3)
316 (lsh (aref str 4) -5)))
317 (aset key 5 (logior
318 (lsh (logand (aref str 4) 31) 2)
319 (lsh (aref str 5) -6)))
320 (aset key 6 (logior
321 (lsh (logand (aref str 5) 63) 1)
322 (lsh (aref str 6) -7)))
323 (aset key 7 (logand (aref str 6) 127))
324 (while (>= i 0)
325 (aset key i (lsh (aref key i) 1))
326 (setq i (1- i)))
327 key))
328
329 (defconst ntlm-smb-perm1 [57 49 41 33 25 17 9
330 1 58 50 42 34 26 18
331 10 2 59 51 43 35 27
332 19 11 3 60 52 44 36
333 63 55 47 39 31 23 15
334 7 62 54 46 38 30 22
335 14 6 61 53 45 37 29
336 21 13 5 28 20 12 4])
337
338 (defconst ntlm-smb-perm2 [14 17 11 24 1 5
339 3 28 15 6 21 10
340 23 19 12 4 26 8
341 16 7 27 20 13 2
342 41 52 31 37 47 55
343 30 40 51 45 33 48
344 44 49 39 56 34 53
345 46 42 50 36 29 32])
346
347 (defconst ntlm-smb-perm3 [58 50 42 34 26 18 10 2
348 60 52 44 36 28 20 12 4
349 62 54 46 38 30 22 14 6
350 64 56 48 40 32 24 16 8
351 57 49 41 33 25 17 9 1
352 59 51 43 35 27 19 11 3
353 61 53 45 37 29 21 13 5
354 63 55 47 39 31 23 15 7])
355
356 (defconst ntlm-smb-perm4 [32 1 2 3 4 5
357 4 5 6 7 8 9
358 8 9 10 11 12 13
359 12 13 14 15 16 17
360 16 17 18 19 20 21
361 20 21 22 23 24 25
362 24 25 26 27 28 29
363 28 29 30 31 32 1])
364
365 (defconst ntlm-smb-perm5 [16 7 20 21
366 29 12 28 17
367 1 15 23 26
368 5 18 31 10
369 2 8 24 14
370 32 27 3 9
371 19 13 30 6
372 22 11 4 25])
373
374 (defconst ntlm-smb-perm6 [40 8 48 16 56 24 64 32
375 39 7 47 15 55 23 63 31
376 38 6 46 14 54 22 62 30
377 37 5 45 13 53 21 61 29
378 36 4 44 12 52 20 60 28
379 35 3 43 11 51 19 59 27
380 34 2 42 10 50 18 58 26
381 33 1 41 9 49 17 57 25])
382
383 (defconst ntlm-smb-sc [1 1 2 2 2 2 2 2 1 2 2 2 2 2 2 1])
384
385 (defconst ntlm-smb-sbox [[[14 4 13 1 2 15 11 8 3 10 6 12 5 9 0 7]
386 [ 0 15 7 4 14 2 13 1 10 6 12 11 9 5 3 8]
387 [ 4 1 14 8 13 6 2 11 15 12 9 7 3 10 5 0]
388 [15 12 8 2 4 9 1 7 5 11 3 14 10 0 6 13]]
389 [[15 1 8 14 6 11 3 4 9 7 2 13 12 0 5 10]
390 [ 3 13 4 7 15 2 8 14 12 0 1 10 6 9 11 5]
391 [ 0 14 7 11 10 4 13 1 5 8 12 6 9 3 2 15]
392 [13 8 10 1 3 15 4 2 11 6 7 12 0 5 14 9]]
393 [[10 0 9 14 6 3 15 5 1 13 12 7 11 4 2 8]
394 [13 7 0 9 3 4 6 10 2 8 5 14 12 11 15 1]
395 [13 6 4 9 8 15 3 0 11 1 2 12 5 10 14 7]
396 [ 1 10 13 0 6 9 8 7 4 15 14 3 11 5 2 12]]
397 [[ 7 13 14 3 0 6 9 10 1 2 8 5 11 12 4 15]
398 [13 8 11 5 6 15 0 3 4 7 2 12 1 10 14 9]
399 [10 6 9 0 12 11 7 13 15 1 3 14 5 2 8 4]
400 [ 3 15 0 6 10 1 13 8 9 4 5 11 12 7 2 14]]
401 [[ 2 12 4 1 7 10 11 6 8 5 3 15 13 0 14 9]
402 [14 11 2 12 4 7 13 1 5 0 15 10 3 9 8 6]
403 [ 4 2 1 11 10 13 7 8 15 9 12 5 6 3 0 14]
404 [11 8 12 7 1 14 2 13 6 15 0 9 10 4 5 3]]
405 [[12 1 10 15 9 2 6 8 0 13 3 4 14 7 5 11]
406 [10 15 4 2 7 12 9 5 6 1 13 14 0 11 3 8]
407 [ 9 14 15 5 2 8 12 3 7 0 4 10 1 13 11 6]
408 [ 4 3 2 12 9 5 15 10 11 14 1 7 6 0 8 13]]
409 [[ 4 11 2 14 15 0 8 13 3 12 9 7 5 10 6 1]
410 [13 0 11 7 4 9 1 10 14 3 5 12 2 15 8 6]
411 [ 1 4 11 13 12 3 7 14 10 15 6 8 0 5 9 2]
412 [ 6 11 13 8 1 4 10 7 9 5 0 15 14 2 3 12]]
413 [[13 2 8 4 6 15 11 1 10 9 3 14 5 0 12 7]
414 [ 1 15 13 8 10 3 7 4 12 5 6 11 0 14 9 2]
415 [ 7 11 4 1 9 12 14 2 0 6 10 13 15 3 5 8]
416 [ 2 1 14 7 4 10 8 13 15 12 9 0 3 5 6 11]]])
417
418 (defsubst ntlm-string-permute (in perm n)
419 "Return a string of length N for a string IN and a permutation vector
420 PERM of size N. The length of IN should be height of PERM."
421 (let ((i 0) (out (make-string n 0)))
422 (while (< i n)
423 (aset out i (aref in (- (aref perm i) 1)))
424 (setq i (1+ i)))
425 out))
426
427 (defsubst ntlm-string-lshift (str count len)
428 "Return a string by circularly shifting a string STR by COUNT to the left.
429 length of STR is LEN."
430 (let ((c (% count len)))
431 (concat (substring str c len) (substring str 0 c))))
432
433 (defsubst ntlm-string-xor (in1 in2 n)
434 "Return exclusive-or of sequences in1 and in2"
435 (let ((w (make-string n 0)) (i 0))
436 (while (< i n)
437 (aset w i (logxor (aref in1 i) (aref in2 i)))
438 (setq i (1+ i)))
439 w))
440
441 (defun ntlm-smb-dohash (in key forw)
442 "Return the hash value for a string IN and a string KEY.
443 Length of IN and KEY are 64. FORW non nill means forward, nil means
444 backward."
445 (let (pk1 ;string of length 56
446 c ;string of length 28
447 d ;string of length 28
448 cd ;string of length 56
449 (ki (make-vector 16 0)) ;vector of string of length 48
450 pd1 ;string of length 64
451 l ;string of length 32
452 r ;string of length 32
453 rl ;string of length 64
454 (i 0) (j 0) (k 0))
455 (setq pk1 (ntlm-string-permute key ntlm-smb-perm1 56))
456 (setq c (substring pk1 0 28))
457 (setq d (substring pk1 28 56))
458
459 (setq i 0)
460 (while (< i 16)
461 (setq c (ntlm-string-lshift c (aref ntlm-smb-sc i) 28))
462 (setq d (ntlm-string-lshift d (aref ntlm-smb-sc i) 28))
463 (setq cd (concat (substring c 0 28) (substring d 0 28)))
464 (aset ki i (ntlm-string-permute cd ntlm-smb-perm2 48))
465 (setq i (1+ i)))
466
467 (setq pd1 (ntlm-string-permute in ntlm-smb-perm3 64))
468
469 (setq l (substring pd1 0 32))
470 (setq r (substring pd1 32 64))
471
472 (setq i 0)
473 (let (er ;string of length 48
474 erk ;string of length 48
475 (b (make-vector 8 0)) ;vector of strings of length 6
476 cb ;string of length 32
477 pcb ;string of length 32
478 r2 ;string of length 32
479 jj m n bj sbox-jmn)
480 (while (< i 16)
481 (setq er (ntlm-string-permute r ntlm-smb-perm4 48))
482 (setq erk (ntlm-string-xor er
483 (aref ki (if forw i (- 15 i)))
484 48))
485 (setq j 0)
486 (while (< j 8)
487 (setq jj (* 6 j))
488 (aset b j (substring erk jj (+ jj 6)))
489 (setq j (1+ j)))
490 (setq j 0)
491 (while (< j 8)
492 (setq bj (aref b j))
493 (setq m (logior (lsh (aref bj 0) 1) (aref bj 5)))
494 (setq n (logior (lsh (aref bj 1) 3)
495 (lsh (aref bj 2) 2)
496 (lsh (aref bj 3) 1)
497 (aref bj 4)))
498 (setq k 0)
499 (setq sbox-jmn (aref (aref (aref ntlm-smb-sbox j) m) n))
500 (while (< k 4)
501 (aset bj k
502 (if (zerop (logand sbox-jmn (lsh 1 (- 3 k))))
503 0 1))
504 (setq k (1+ k)))
505 (setq j (1+ j)))
506
507 (setq j 0)
508 (setq cb nil)
509 (while (< j 8)
510 (setq cb (concat cb (substring (aref b j) 0 4)))
511 (setq j (1+ j)))
512
513 (setq pcb (ntlm-string-permute cb ntlm-smb-perm5 32))
514 (setq r2 (ntlm-string-xor l pcb 32))
515 (setq l r)
516 (setq r r2)
517 (setq i (1+ i))))
518 (setq rl (concat r l))
519 (ntlm-string-permute rl ntlm-smb-perm6 64)))
520
521 (defun ntlm-md4hash (passwd)
522 "Return the 16 bytes MD4 hash of a string PASSWD after converting it
523 into a Unicode string. PASSWD is truncated to 128 bytes if longer."
524 (let (len wpwd)
525 ;; Password cannot be longer than 128 characters
526 (setq len (length passwd))
527 (if (> len 128)
528 (setq len 128))
529 ;; Password must be converted to NT unicode
530 (setq wpwd (ntlm-ascii2unicode passwd len))
531 ;; Calculate length in bytes
532 (setq len (* len 2))
533 (md4 wpwd len)))
534
535 (provide 'ntlm)
536
537 ;; arch-tag: 348ace18-f8e2-4176-8fe9-d9ab4e96f296
538 ;;; ntlm.el ends here
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