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1 | ;;; sha1.el --- SHA1 Secure Hash Algorithm in Emacs-Lisp |
2 | ||
3 | ;; Copyright (C) 1999, 2001, 2002, 2003, 2004, | |
e3fe4da0 | 4 | ;; 2005, 2006, 2007, 2008 Free Software Foundation, Inc. |
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5 | |
6 | ;; Author: Shuhei KOBAYASHI <shuhei@aqua.ocn.ne.jp> | |
7 | ;; Keywords: SHA1, FIPS 180-1 | |
8 | ||
9 | ;; This file is part of GNU Emacs. | |
10 | ||
eb3fa2cf | 11 | ;; GNU Emacs is free software: you can redistribute it and/or modify |
06cec913 | 12 | ;; it under the terms of the GNU General Public License as published by |
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13 | ;; the Free Software Foundation, either version 3 of the License, or |
14 | ;; (at your option) any later version. | |
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15 | |
16 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
17 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | ;; GNU General Public License for more details. | |
20 | ||
21 | ;; You should have received a copy of the GNU General Public License | |
eb3fa2cf | 22 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. |
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23 | |
24 | ;;; Commentary: | |
25 | ||
26 | ;; This program is implemented from the definition of SHA-1 in FIPS PUB | |
27 | ;; 180-1 (Federal Information Processing Standards Publication 180-1), | |
28 | ;; "Announcing the Standard for SECURE HASH STANDARD". | |
29 | ;; <URL:http://www.itl.nist.gov/div897/pubs/fip180-1.htm> | |
30 | ;; (EXCEPTION; two optimizations taken from GnuPG/cipher/sha1.c) | |
31 | ;; | |
32 | ;; Test cases from FIPS PUB 180-1. | |
33 | ;; | |
34 | ;; (sha1 "abc") | |
35 | ;; => a9993e364706816aba3e25717850c26c9cd0d89d | |
36 | ;; | |
37 | ;; (sha1 "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq") | |
38 | ;; => 84983e441c3bd26ebaae4aa1f95129e5e54670f1 | |
39 | ;; | |
40 | ;; (sha1 (make-string 1000000 ?a)) | |
41 | ;; => 34aa973cd4c4daa4f61eeb2bdbad27316534016f | |
42 | ;; | |
43 | ;; BUGS: | |
44 | ;; * It is assumed that length of input string is less than 2^29 bytes. | |
45 | ;; * It is caller's responsibility to make string (or region) unibyte. | |
46 | ;; | |
47 | ;; TODO: | |
48 | ;; * Rewrite from scratch! | |
49 | ;; This version is much faster than Keiichi Suzuki's another sha1.el, | |
50 | ;; but it is too dirty. | |
51 | ||
52 | ;;; Code: | |
53 | ||
54 | (require 'hex-util) | |
55 | ||
56 | ;;; | |
57 | ;;; external SHA1 function. | |
58 | ;;; | |
59 | ||
60 | (defgroup sha1 nil | |
61 | "Elisp interface for SHA1 hash computation." | |
62 | :version "22.1" | |
63 | :group 'extensions) | |
64 | ||
65 | (defcustom sha1-maximum-internal-length 500 | |
66 | "*Maximum length of message to use Lisp version of SHA1 function. | |
67 | If message is longer than this, `sha1-program' is used instead. | |
68 | ||
69 | If this variable is set to 0, use external program only. | |
70 | If this variable is set to nil, use internal function only." | |
71 | :type 'integer | |
72 | :group 'sha1) | |
73 | ||
74 | (defcustom sha1-program '("sha1sum") | |
75 | "*Name of program to compute SHA1. | |
76 | It must be a string \(program name\) or list of strings \(name and its args\)." | |
77 | :type '(repeat string) | |
78 | :group 'sha1) | |
79 | ||
80 | (defcustom sha1-use-external (condition-case () | |
81 | (executable-find (car sha1-program)) | |
82 | (error)) | |
83 | "*Use external SHA1 program. | |
84 | If this variable is set to nil, use internal function only." | |
85 | :type 'boolean | |
86 | :group 'sha1) | |
87 | ||
88 | (defun sha1-string-external (string &optional binary) | |
d0081058 | 89 | (let (prog args digest) |
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90 | (if (consp sha1-program) |
91 | (setq prog (car sha1-program) | |
92 | args (cdr sha1-program)) | |
93 | (setq prog sha1-program | |
94 | args nil)) | |
95 | (with-temp-buffer | |
d0081058 | 96 | (set-buffer-multibyte nil) |
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97 | (insert string) |
98 | (apply (function call-process-region) | |
d0081058 | 99 | (point-min) (point-max) |
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100 | prog t t nil args) |
101 | ;; SHA1 is 40 bytes long in hexadecimal form. | |
102 | (setq digest (buffer-substring (point-min)(+ (point-min) 40)))) | |
103 | (if binary | |
104 | (decode-hex-string digest) | |
105 | digest))) | |
106 | ||
107 | (defun sha1-region-external (beg end &optional binary) | |
108 | (sha1-string-external (buffer-substring-no-properties beg end) binary)) | |
109 | ||
110 | ;;; | |
111 | ;;; internal SHA1 function. | |
112 | ;;; | |
113 | ||
114 | (eval-when-compile | |
115 | ;; optional second arg of string-to-number is new in v20. | |
116 | (defconst sha1-K0-high 23170) ; (string-to-number "5A82" 16) | |
117 | (defconst sha1-K0-low 31129) ; (string-to-number "7999" 16) | |
118 | (defconst sha1-K1-high 28377) ; (string-to-number "6ED9" 16) | |
119 | (defconst sha1-K1-low 60321) ; (string-to-number "EBA1" 16) | |
120 | (defconst sha1-K2-high 36635) ; (string-to-number "8F1B" 16) | |
121 | (defconst sha1-K2-low 48348) ; (string-to-number "BCDC" 16) | |
122 | (defconst sha1-K3-high 51810) ; (string-to-number "CA62" 16) | |
123 | (defconst sha1-K3-low 49622) ; (string-to-number "C1D6" 16) | |
124 | ||
125 | ;; original definition of sha1-F0. | |
126 | ;; (defmacro sha1-F0 (B C D) | |
127 | ;; (` (logior (logand (, B) (, C)) | |
128 | ;; (logand (lognot (, B)) (, D))))) | |
129 | ;; a little optimization from GnuPG/cipher/sha1.c. | |
130 | (defmacro sha1-F0 (B C D) | |
131 | `(logxor ,D (logand ,B (logxor ,C ,D)))) | |
132 | (defmacro sha1-F1 (B C D) | |
133 | `(logxor ,B ,C ,D)) | |
134 | ;; original definition of sha1-F2. | |
135 | ;; (defmacro sha1-F2 (B C D) | |
136 | ;; (` (logior (logand (, B) (, C)) | |
137 | ;; (logand (, B) (, D)) | |
138 | ;; (logand (, C) (, D))))) | |
139 | ;; a little optimization from GnuPG/cipher/sha1.c. | |
140 | (defmacro sha1-F2 (B C D) | |
141 | `(logior (logand ,B ,C) | |
142 | (logand ,D (logior ,B ,C)))) | |
143 | (defmacro sha1-F3 (B C D) | |
144 | `(logxor ,B ,C ,D)) | |
145 | ||
146 | (defmacro sha1-S1 (W-high W-low) | |
147 | `(let ((W-high ,W-high) | |
148 | (W-low ,W-low)) | |
149 | (setq S1W-high (+ (% (* W-high 2) 65536) | |
150 | (/ W-low ,(/ 65536 2)))) | |
151 | (setq S1W-low (+ (/ W-high ,(/ 65536 2)) | |
152 | (% (* W-low 2) 65536))))) | |
153 | (defmacro sha1-S5 (A-high A-low) | |
154 | `(progn | |
155 | (setq S5A-high (+ (% (* ,A-high 32) 65536) | |
156 | (/ ,A-low ,(/ 65536 32)))) | |
157 | (setq S5A-low (+ (/ ,A-high ,(/ 65536 32)) | |
158 | (% (* ,A-low 32) 65536))))) | |
159 | (defmacro sha1-S30 (B-high B-low) | |
160 | `(progn | |
161 | (setq S30B-high (+ (/ ,B-high 4) | |
162 | (* (% ,B-low 4) ,(/ 65536 4)))) | |
163 | (setq S30B-low (+ (/ ,B-low 4) | |
164 | (* (% ,B-high 4) ,(/ 65536 4)))))) | |
165 | ||
166 | (defmacro sha1-OP (round) | |
167 | `(progn | |
168 | (sha1-S5 sha1-A-high sha1-A-low) | |
169 | (sha1-S30 sha1-B-high sha1-B-low) | |
170 | (setq sha1-A-low (+ (,(intern (format "sha1-F%d" round)) | |
171 | sha1-B-low sha1-C-low sha1-D-low) | |
172 | sha1-E-low | |
173 | ,(symbol-value | |
174 | (intern (format "sha1-K%d-low" round))) | |
175 | (aref block-low idx) | |
176 | (progn | |
177 | (setq sha1-E-low sha1-D-low) | |
178 | (setq sha1-D-low sha1-C-low) | |
179 | (setq sha1-C-low S30B-low) | |
180 | (setq sha1-B-low sha1-A-low) | |
181 | S5A-low))) | |
182 | (setq carry (/ sha1-A-low 65536)) | |
183 | (setq sha1-A-low (% sha1-A-low 65536)) | |
184 | (setq sha1-A-high (% (+ (,(intern (format "sha1-F%d" round)) | |
185 | sha1-B-high sha1-C-high sha1-D-high) | |
186 | sha1-E-high | |
187 | ,(symbol-value | |
188 | (intern (format "sha1-K%d-high" round))) | |
189 | (aref block-high idx) | |
190 | (progn | |
191 | (setq sha1-E-high sha1-D-high) | |
192 | (setq sha1-D-high sha1-C-high) | |
193 | (setq sha1-C-high S30B-high) | |
194 | (setq sha1-B-high sha1-A-high) | |
195 | S5A-high) | |
196 | carry) | |
197 | 65536)))) | |
198 | ||
199 | (defmacro sha1-add-to-H (H X) | |
200 | `(progn | |
201 | (setq ,(intern (format "sha1-%s-low" H)) | |
202 | (+ ,(intern (format "sha1-%s-low" H)) | |
203 | ,(intern (format "sha1-%s-low" X)))) | |
204 | (setq carry (/ ,(intern (format "sha1-%s-low" H)) 65536)) | |
205 | (setq ,(intern (format "sha1-%s-low" H)) | |
206 | (% ,(intern (format "sha1-%s-low" H)) 65536)) | |
207 | (setq ,(intern (format "sha1-%s-high" H)) | |
208 | (% (+ ,(intern (format "sha1-%s-high" H)) | |
209 | ,(intern (format "sha1-%s-high" X)) | |
210 | carry) | |
211 | 65536)))) | |
212 | ) | |
213 | ||
214 | ;;; buffers (H0 H1 H2 H3 H4). | |
215 | (defvar sha1-H0-high) | |
216 | (defvar sha1-H0-low) | |
217 | (defvar sha1-H1-high) | |
218 | (defvar sha1-H1-low) | |
219 | (defvar sha1-H2-high) | |
220 | (defvar sha1-H2-low) | |
221 | (defvar sha1-H3-high) | |
222 | (defvar sha1-H3-low) | |
223 | (defvar sha1-H4-high) | |
224 | (defvar sha1-H4-low) | |
225 | ||
226 | (defun sha1-block (block-high block-low) | |
227 | (let (;; step (c) --- initialize buffers (A B C D E). | |
228 | (sha1-A-high sha1-H0-high) (sha1-A-low sha1-H0-low) | |
229 | (sha1-B-high sha1-H1-high) (sha1-B-low sha1-H1-low) | |
230 | (sha1-C-high sha1-H2-high) (sha1-C-low sha1-H2-low) | |
231 | (sha1-D-high sha1-H3-high) (sha1-D-low sha1-H3-low) | |
232 | (sha1-E-high sha1-H4-high) (sha1-E-low sha1-H4-low) | |
233 | (idx 16)) | |
234 | ;; step (b). | |
235 | (let (;; temporary variables used in sha1-S1 macro. | |
236 | S1W-high S1W-low) | |
237 | (while (< idx 80) | |
238 | (sha1-S1 (logxor (aref block-high (- idx 3)) | |
239 | (aref block-high (- idx 8)) | |
240 | (aref block-high (- idx 14)) | |
241 | (aref block-high (- idx 16))) | |
242 | (logxor (aref block-low (- idx 3)) | |
243 | (aref block-low (- idx 8)) | |
244 | (aref block-low (- idx 14)) | |
245 | (aref block-low (- idx 16)))) | |
246 | (aset block-high idx S1W-high) | |
247 | (aset block-low idx S1W-low) | |
248 | (setq idx (1+ idx)))) | |
249 | ;; step (d). | |
250 | (setq idx 0) | |
251 | (let (;; temporary variables used in sha1-OP macro. | |
252 | S5A-high S5A-low S30B-high S30B-low carry) | |
253 | (while (< idx 20) (sha1-OP 0) (setq idx (1+ idx))) | |
254 | (while (< idx 40) (sha1-OP 1) (setq idx (1+ idx))) | |
255 | (while (< idx 60) (sha1-OP 2) (setq idx (1+ idx))) | |
256 | (while (< idx 80) (sha1-OP 3) (setq idx (1+ idx)))) | |
257 | ;; step (e). | |
258 | (let (;; temporary variables used in sha1-add-to-H macro. | |
259 | carry) | |
260 | (sha1-add-to-H H0 A) | |
261 | (sha1-add-to-H H1 B) | |
262 | (sha1-add-to-H H2 C) | |
263 | (sha1-add-to-H H3 D) | |
264 | (sha1-add-to-H H4 E)))) | |
265 | ||
266 | (defun sha1-binary (string) | |
267 | "Return the SHA1 of STRING in binary form." | |
268 | (let (;; prepare buffers for a block. byte-length of block is 64. | |
269 | ;; input block is split into two vectors. | |
270 | ;; | |
271 | ;; input block: 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F ... | |
272 | ;; block-high: +-0-+ +-1-+ +-2-+ +-3-+ | |
273 | ;; block-low: +-0-+ +-1-+ +-2-+ +-3-+ | |
274 | ;; | |
275 | ;; length of each vector is 80, and elements of each vector are | |
276 | ;; 16bit integers. elements 0x10-0x4F of each vector are | |
277 | ;; assigned later in `sha1-block'. | |
278 | (block-high (eval-when-compile (make-vector 80 nil))) | |
279 | (block-low (eval-when-compile (make-vector 80 nil)))) | |
280 | (unwind-protect | |
281 | (let* (;; byte-length of input string. | |
282 | (len (length string)) | |
283 | (lim (* (/ len 64) 64)) | |
284 | (rem (% len 4)) | |
285 | (idx 0)(pos 0)) | |
286 | ;; initialize buffers (H0 H1 H2 H3 H4). | |
287 | (setq sha1-H0-high 26437 ; (string-to-number "6745" 16) | |
288 | sha1-H0-low 8961 ; (string-to-number "2301" 16) | |
289 | sha1-H1-high 61389 ; (string-to-number "EFCD" 16) | |
290 | sha1-H1-low 43913 ; (string-to-number "AB89" 16) | |
291 | sha1-H2-high 39098 ; (string-to-number "98BA" 16) | |
292 | sha1-H2-low 56574 ; (string-to-number "DCFE" 16) | |
293 | sha1-H3-high 4146 ; (string-to-number "1032" 16) | |
294 | sha1-H3-low 21622 ; (string-to-number "5476" 16) | |
295 | sha1-H4-high 50130 ; (string-to-number "C3D2" 16) | |
296 | sha1-H4-low 57840) ; (string-to-number "E1F0" 16) | |
297 | ;; loop for each 64 bytes block. | |
298 | (while (< pos lim) | |
299 | ;; step (a). | |
300 | (setq idx 0) | |
301 | (while (< idx 16) | |
302 | (aset block-high idx (+ (* (aref string pos) 256) | |
303 | (aref string (1+ pos)))) | |
304 | (setq pos (+ pos 2)) | |
305 | (aset block-low idx (+ (* (aref string pos) 256) | |
306 | (aref string (1+ pos)))) | |
307 | (setq pos (+ pos 2)) | |
308 | (setq idx (1+ idx))) | |
309 | (sha1-block block-high block-low)) | |
310 | ;; last block. | |
311 | (if (prog1 | |
312 | (< (- len lim) 56) | |
313 | (setq lim (- len rem)) | |
314 | (setq idx 0) | |
315 | (while (< pos lim) | |
316 | (aset block-high idx (+ (* (aref string pos) 256) | |
317 | (aref string (1+ pos)))) | |
318 | (setq pos (+ pos 2)) | |
319 | (aset block-low idx (+ (* (aref string pos) 256) | |
320 | (aref string (1+ pos)))) | |
321 | (setq pos (+ pos 2)) | |
322 | (setq idx (1+ idx))) | |
323 | ;; this is the last (at most) 32bit word. | |
324 | (cond | |
325 | ((= rem 3) | |
326 | (aset block-high idx (+ (* (aref string pos) 256) | |
327 | (aref string (1+ pos)))) | |
328 | (setq pos (+ pos 2)) | |
329 | (aset block-low idx (+ (* (aref string pos) 256) | |
330 | 128))) | |
331 | ((= rem 2) | |
332 | (aset block-high idx (+ (* (aref string pos) 256) | |
333 | (aref string (1+ pos)))) | |
334 | (aset block-low idx 32768)) | |
335 | ((= rem 1) | |
336 | (aset block-high idx (+ (* (aref string pos) 256) | |
337 | 128)) | |
338 | (aset block-low idx 0)) | |
339 | (t ;; (= rem 0) | |
340 | (aset block-high idx 32768) | |
341 | (aset block-low idx 0))) | |
342 | (setq idx (1+ idx)) | |
343 | (while (< idx 16) | |
344 | (aset block-high idx 0) | |
345 | (aset block-low idx 0) | |
346 | (setq idx (1+ idx)))) | |
347 | ;; last block has enough room to write the length of string. | |
348 | (progn | |
349 | ;; write bit length of string to last 4 bytes of the block. | |
350 | (aset block-low 15 (* (% len 8192) 8)) | |
351 | (setq len (/ len 8192)) | |
352 | (aset block-high 15 (% len 65536)) | |
353 | ;; XXX: It is not practical to compute SHA1 of | |
354 | ;; such a huge message on emacs. | |
355 | ;; (setq len (/ len 65536)) ; for 64bit emacs. | |
356 | ;; (aset block-low 14 (% len 65536)) | |
357 | ;; (aset block-high 14 (/ len 65536)) | |
358 | (sha1-block block-high block-low)) | |
359 | ;; need one more block. | |
360 | (sha1-block block-high block-low) | |
361 | (fillarray block-high 0) | |
362 | (fillarray block-low 0) | |
363 | ;; write bit length of string to last 4 bytes of the block. | |
364 | (aset block-low 15 (* (% len 8192) 8)) | |
365 | (setq len (/ len 8192)) | |
366 | (aset block-high 15 (% len 65536)) | |
367 | ;; XXX: It is not practical to compute SHA1 of | |
368 | ;; such a huge message on emacs. | |
369 | ;; (setq len (/ len 65536)) ; for 64bit emacs. | |
370 | ;; (aset block-low 14 (% len 65536)) | |
371 | ;; (aset block-high 14 (/ len 65536)) | |
372 | (sha1-block block-high block-low)) | |
373 | ;; make output string (in binary form). | |
374 | (let ((result (make-string 20 0))) | |
375 | (aset result 0 (/ sha1-H0-high 256)) | |
376 | (aset result 1 (% sha1-H0-high 256)) | |
377 | (aset result 2 (/ sha1-H0-low 256)) | |
378 | (aset result 3 (% sha1-H0-low 256)) | |
379 | (aset result 4 (/ sha1-H1-high 256)) | |
380 | (aset result 5 (% sha1-H1-high 256)) | |
381 | (aset result 6 (/ sha1-H1-low 256)) | |
382 | (aset result 7 (% sha1-H1-low 256)) | |
383 | (aset result 8 (/ sha1-H2-high 256)) | |
384 | (aset result 9 (% sha1-H2-high 256)) | |
385 | (aset result 10 (/ sha1-H2-low 256)) | |
386 | (aset result 11 (% sha1-H2-low 256)) | |
387 | (aset result 12 (/ sha1-H3-high 256)) | |
388 | (aset result 13 (% sha1-H3-high 256)) | |
389 | (aset result 14 (/ sha1-H3-low 256)) | |
390 | (aset result 15 (% sha1-H3-low 256)) | |
391 | (aset result 16 (/ sha1-H4-high 256)) | |
392 | (aset result 17 (% sha1-H4-high 256)) | |
393 | (aset result 18 (/ sha1-H4-low 256)) | |
394 | (aset result 19 (% sha1-H4-low 256)) | |
395 | result)) | |
396 | ;; do not leave a copy of input string. | |
397 | (fillarray block-high nil) | |
398 | (fillarray block-low nil)))) | |
399 | ||
400 | (defun sha1-string-internal (string &optional binary) | |
401 | (if binary | |
402 | (sha1-binary string) | |
403 | (encode-hex-string (sha1-binary string)))) | |
404 | ||
405 | (defun sha1-region-internal (beg end &optional binary) | |
406 | (sha1-string-internal (buffer-substring-no-properties beg end) binary)) | |
407 | ||
408 | ;;; | |
409 | ;;; application interface. | |
410 | ;;; | |
411 | ||
412 | (defun sha1-region (beg end &optional binary) | |
413 | (if (and sha1-use-external | |
414 | sha1-maximum-internal-length | |
415 | (> (abs (- end beg)) sha1-maximum-internal-length)) | |
416 | (sha1-region-external beg end binary) | |
417 | (sha1-region-internal beg end binary))) | |
418 | ||
419 | (defun sha1-string (string &optional binary) | |
420 | (if (and sha1-use-external | |
421 | sha1-maximum-internal-length | |
422 | (> (length string) sha1-maximum-internal-length)) | |
423 | (sha1-string-external string binary) | |
424 | (sha1-string-internal string binary))) | |
425 | ||
426 | ;;;###autoload | |
427 | (defun sha1 (object &optional beg end binary) | |
428 | "Return the SHA1 (Secure Hash Algorithm) of an object. | |
429 | OBJECT is either a string or a buffer. | |
430 | Optional arguments BEG and END denote buffer positions for computing the | |
431 | hash of a portion of OBJECT. | |
432 | If BINARY is non-nil, return a string in binary form." | |
433 | (if (stringp object) | |
434 | (sha1-string object binary) | |
435 | (with-current-buffer object | |
436 | (sha1-region (or beg (point-min)) (or end (point-max)) binary)))) | |
437 | ||
438 | (provide 'sha1) | |
439 | ||
440 | ;; arch-tag: c0f9abd0-ffc1-4557-aac6-ece7f2d4c901 | |
441 | ;;; sha1.el ends here |