-;;; sha1.el --- SHA1 Message Digest Algorithm.
-;; Copyright (C) 1998,1999 Keiichi Suzuki.
+;;; sha1-el.el --- SHA1 Secure Hash Algorithm in Emacs-Lisp.
-;; Author: Keiichi Suzuki <kei-suzu@mail.wbs.ne.jp>
-;; Author: Katsumi Yamaoka <yamaoka@jpl.org>
-;; Created: 1998-12-25
-;; Revised: 1999-01-13
-;; Keywords: sha1, news, cancel-lock, hmac, rfc2104
+;; Copyright (C) 1999 Shuhei KOBAYASHI
-;; This program 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.
+;; Author: Shuhei KOBAYASHI <shuhei@aqua.ocn.ne.jp>
+;; Keywords: SHA1, FIPS 180-1
+
+;; This file is part of FLIM (Faithful Library about Internet Message).
+
+;; This program 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.
;; This program 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
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
-;;; A copy of the GNU General Public License can be obtained from this
-;;; program's author (send electronic mail to kyle@uunet.uu.net) or from
-;;; the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA
-;;; 02139, USA.
+;; You should have received a copy of the GNU General Public License
+;; along with this program; see the file COPYING. If not, write to
+;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
;;; Commentary:
-;; This is a direct translation into Emacs LISP of the reference C
-;; implementation of the SHA1 message digest algorithm.
-
-;;; Usage:
-
-;; To compute the SHA1 message digest for a message M (represented as
-;; a string), call
-;;
-;; (sha1-encode M)
+;; This program is implemented from the definition of SHA-1 in FIPS PUB
+;; 180-1 (Federal Information Processing Standards Publication 180-1),
+;; "Announcing the Standard for SECURE HASH STANDARD".
+;; <URL:http://www.itl.nist.gov/div897/pubs/fip180-1.htm>
+;; EXCEPTION:
+;; * Two optimizations taken from GnuPG/cipher/sha1.c.
;;
-;; which returns the message digest as a hexadecimal string of 20 bytes.
-;; If you need to supply the message in pieces M1, M2, ... Mn, then call
-;;
-;; (sha1-init)
-;; (sha1-update M1)
-;; (sha1-update M2)
-;; ...
-;; (sha1-update Mn)
-;; (sha1-final)
-
-;;; Notes:
-
-;; 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 19 bits of integer representation in order to represent the
-;; carry from a 16-bit addition. (see sha1-add())
+;; BUGS:
+;; * It is assumed that length of input string is less than 2^29 bytes.
+;; * It is caller's responsibility to make string (or region) unibyte.
;;; Code:
-(defmacro sha1-f1 (x y z)
- `(cons
- (logior (logand (car ,x) (car ,y)) (logand (lognot (car ,x)) (car ,z)))
- (logior (logand (cdr ,x) (cdr ,y)) (logand (lognot (cdr ,x)) (cdr ,z)))
- ))
-
-(defmacro sha1-f2 (x y z)
- `(cons
- (logxor (car ,x) (car ,y) (car ,z))
- (logxor (cdr ,x) (cdr ,y) (cdr ,z))
- ))
-
-(defmacro sha1-f3 (x y z)
- `(cons
- (logior (logand (car ,x) (car ,y)) (logand (car ,x) (car ,z))
- (logand (car ,y) (car ,z)))
- (logior (logand (cdr ,x) (cdr ,y)) (logand (cdr ,x) (cdr ,z))
- (logand (cdr ,y) (cdr ,z)))
- ))
-
-(defmacro sha1-f4 (x y z)
- `(cons
- (logxor (car ,x) (car ,y) (car ,z))
- (logxor (cdr ,x) (cdr ,y) (cdr ,z))
- ))
-
-(defconst sha1-const1 '(23170 . 31129)
- "SHA constants 1 \(0x5a827999\)")
-(defconst sha1-const2 '(28377 . 60321)
- "SHA constants 2 \(0x6ed9eba1\)")
-(defconst sha1-const3 '(36635 . 48348)
- "SHA constants 3 \(0x8f1bbcdc\)")
-(defconst sha1-const4 '(51810 . 49622)
- "SHA constants 4 \(0xca62c1d6\)")
-
-(defvar sha1-digest (make-vector 5 nil))
-(defvar sha1-count-lo nil)
-(defvar sha1-count-hi nil)
-(defvar sha1-data nil)
-(defvar sha1-local nil)
-(defconst SHA1-BLOCKSIZE 64)
-
-(defun sha1-init ()
- "Initialize the state of the SHA1 message digest routines."
- (aset sha1-digest 0 (cons 26437 8961))
- (aset sha1-digest 1 (cons 61389 43913))
- (aset sha1-digest 2 (cons 39098 56574))
- (aset sha1-digest 3 (cons 4146 21622))
- (aset sha1-digest 4 (cons 50130 57840))
- (setq sha1-count-lo (cons 0 0)
- sha1-count-hi (cons 0 0)
- sha1-local 0
- sha1-data nil)
- )
-
-(defmacro sha1-32-make (v)
- "Return 32bits internal value from normal integer."
- `(cons (lsh ,v -16) (logand 65535 ,v)))
-
-(defun sha1-add (to &rest vals)
- "Set sum of all the arguments to the first one."
- (let (val)
- (while (setq val (car vals))
- (setcar to (+ (car to) (car val)))
- (setcdr to (+ (cdr to) (cdr val)))
- (setq vals (cdr vals))
- )
- (setcar to (logand 65535 (+ (car to) (lsh (cdr to) -16))))
- (setcdr to (logand 65535 (cdr to)))
- to
- ))
-
-(defun sha1-xor (to &rest vals)
- "Set bitwise-exclusive-or of all the arguments to the first one."
- (let (val)
- (while (setq val (car vals))
- (setcar to (logxor (car to) (car val)))
- (setcdr to (logxor (cdr to) (cdr val)))
- (setq vals (cdr vals)))
- ))
-
-(defmacro sha1-rot (val c1 c2)
- "Internal macro for sha1-rot-*."
- `(cons
- (logand 65535 (logior (lsh (car ,val) ,c1) (lsh (cdr ,val) ,c2)))
- (logand 65535 (logior (lsh (cdr ,val) ,c1) (lsh (car ,val) ,c2)))
- ))
-
-(defmacro sha1-rot-1 (val)
- "Return VAL with its bits rotated left by 1."
- `(sha1-rot ,val 1 -15)
- )
-
-(defmacro sha1-rot-5 (val)
- "Return VAL with its bits rotated left by 5."
- `(sha1-rot ,val 5 -11)
- )
-
-(defmacro sha1-rot-30 (val)
- "Return VAL with its bits rotated left by 30."
- `(sha1-rot ,val -2 14)
- )
-
-(defun sha1-inc (to)
- "Set TO pulus one to TO."
- (setcdr to (1+ (cdr to)))
- (when (> (cdr to) 65535)
- (setcdr to (logand 65535 (cdr to)))
- (setcar to (logand 65535 (1+ (car to))))))
-
-(defun sha1-lsh (to v count)
- "Set TO with its bits shifted left by COUNT to TO."
- (setcar to (logand 65535
- (logior (lsh (car v) count) (lsh (cdr v) (- count 16)))))
- (setcdr to (logand 65535 (lsh (cdr v) count)))
- to
- )
-
-(defun sha1-rsh (to v count)
- "Set TO with its bits shifted right by COUNT to TO."
- (setq count (- 0 count))
- (setcdr to (logand 65535
- (logior (lsh (cdr v) count) (lsh (car v) (- count 16)))))
- (setcar to (logand 65535 (lsh (car v) count)))
- to
- )
-
-(defun sha1-< (v1 v2)
- "Return t if firast argment is less then second argument."
- (or (< (car v1) (car v2))
- (and (eq (car v1) (car v2))
- (< (cdr v1) (cdr v2))))
- )
-
-(unless (fboundp 'string-as-unibyte)
- (defsubst string-as-unibyte (string)
- string)
+(require 'hex-util)
+
+;;;
+;;; external SHA1 function.
+;;;
+
+(defvar sha1-maximum-internal-length 500
+ "*Maximum length of message to use lisp version of SHA1 function.
+If message is longer than this, `sha1-program' is used instead.
+
+If this variable is set to 0, use extarnal program only.
+If this variable is set to nil, use internal function only.")
+
+(defvar sha1-program '("openssl" "sha1")
+ "*Name of program to compute SHA1.
+It must be a string \(program name\) or list of strings \(name and its args\).")
+
+(defun sha1-string-external (string)
+ ;; `with-temp-buffer' is new in v20, so we do not use it.
+ (save-excursion
+ (let (buffer)
+ (unwind-protect
+ (let (prog args)
+ (if (consp sha1-program)
+ (setq prog (car sha1-program)
+ args (cdr sha1-program))
+ (setq prog sha1-program
+ args nil))
+ (setq buffer (set-buffer
+ (generate-new-buffer " *sha1 external*")))
+ (insert string)
+ (apply (function call-process-region)
+ (point-min)(point-max)
+ prog t t nil args)
+ ;; SHA1 is 40 bytes long in hexadecimal form.
+ (buffer-substring (point-min)(+ (point-min) 40)))
+ (and buffer
+ (buffer-name buffer)
+ (kill-buffer buffer))))))
+
+(defun sha1-region-external (beg end)
+ (sha1-string-external (buffer-substring-no-properties beg end)))
+
+;;;
+;;; internal SHA1 function.
+;;;
+
+(eval-when-compile
+ ;; optional second arg of string-to-number is new in v20.
+ (defconst sha1-K0-high 23170) ; (string-to-number "5A82" 16)
+ (defconst sha1-K0-low 31129) ; (string-to-number "7999" 16)
+ (defconst sha1-K1-high 28377) ; (string-to-number "6ED9" 16)
+ (defconst sha1-K1-low 60321) ; (string-to-number "EBA1" 16)
+ (defconst sha1-K2-high 36635) ; (string-to-number "8F1B" 16)
+ (defconst sha1-K2-low 48348) ; (string-to-number "BCDC" 16)
+ (defconst sha1-K3-high 51810) ; (string-to-number "CA62" 16)
+ (defconst sha1-K3-low 49622) ; (string-to-number "C1D6" 16)
+
+;;; original definition of sha1-F0.
+;;; (defmacro sha1-F0 (B C D)
+;;; (` (logior (logand (, B) (, C))
+;;; (logand (lognot (, B)) (, D)))))
+;;; a little optimization from GnuPG/cipher/sha1.c.
+ (defmacro sha1-F0 (B C D)
+ (` (logxor (, D) (logand (, B) (logxor (, C) (, D))))))
+ (defmacro sha1-F1 (B C D)
+ (` (logxor (, B) (, C) (, D))))
+;;; original definition of sha1-F2.
+;;; (defmacro sha1-F2 (B C D)
+;;; (` (logior (logand (, B) (, C))
+;;; (logand (, B) (, D))
+;;; (logand (, C) (, D)))))
+;;; a little optimization from GnuPG/cipher/sha1.c.
+ (defmacro sha1-F2 (B C D)
+ (` (logior (logand (, B) (, C))
+ (logand (, D) (logior (, B) (, C))))))
+ (defmacro sha1-F3 (B C D)
+ (` (logxor (, B) (, C) (, D))))
+
+ (defmacro sha1-S1 (W-high W-low)
+ (` (let ((W-high (, W-high))
+ (W-low (, W-low)))
+ (setq S1W-high (+ (% (* W-high 2) 65536)
+ (/ W-low (, (/ 65536 2)))))
+ (setq S1W-low (+ (/ W-high (, (/ 65536 2)))
+ (% (* W-low 2) 65536))))))
+ (defmacro sha1-S5 (A-high A-low)
+ (` (progn
+ (setq S5A-high (+ (% (* (, A-high) 32) 65536)
+ (/ (, A-low) (, (/ 65536 32)))))
+ (setq S5A-low (+ (/ (, A-high) (, (/ 65536 32)))
+ (% (* (, A-low) 32) 65536))))))
+ (defmacro sha1-S30 (B-high B-low)
+ (` (progn
+ (setq S30B-high (+ (/ (, B-high) 4)
+ (* (% (, B-low) 4) (, (/ 65536 4)))))
+ (setq S30B-low (+ (/ (, B-low) 4)
+ (* (% (, B-high) 4) (, (/ 65536 4))))))))
+
+ (defmacro sha1-OP (round)
+ (` (progn
+ (sha1-S5 sha1-A-high sha1-A-low)
+ (sha1-S30 sha1-B-high sha1-B-low)
+ (setq sha1-A-low (+ ((, (intern (format "sha1-F%d" round)))
+ sha1-B-low sha1-C-low sha1-D-low)
+ sha1-E-low
+ (, (symbol-value
+ (intern (format "sha1-K%d-low" round))))
+ (aref block-low idx)
+ (progn
+ (setq sha1-E-low sha1-D-low)
+ (setq sha1-D-low sha1-C-low)
+ (setq sha1-C-low S30B-low)
+ (setq sha1-B-low sha1-A-low)
+ S5A-low)))
+ (setq carry (/ sha1-A-low 65536))
+ (setq sha1-A-low (% sha1-A-low 65536))
+ (setq sha1-A-high (% (+ ((, (intern (format "sha1-F%d" round)))
+ sha1-B-high sha1-C-high sha1-D-high)
+ sha1-E-high
+ (, (symbol-value
+ (intern (format "sha1-K%d-high" round))))
+ (aref block-high idx)
+ (progn
+ (setq sha1-E-high sha1-D-high)
+ (setq sha1-D-high sha1-C-high)
+ (setq sha1-C-high S30B-high)
+ (setq sha1-B-high sha1-A-high)
+ S5A-high)
+ carry)
+ 65536)))))
+
+ (defmacro sha1-add-to-H (H X)
+ (` (progn
+ (setq (, (intern (format "sha1-%s-low" H)))
+ (+ (, (intern (format "sha1-%s-low" H)))
+ (, (intern (format "sha1-%s-low" X)))))
+ (setq carry (/ (, (intern (format "sha1-%s-low" H))) 65536))
+ (setq (, (intern (format "sha1-%s-low" H)))
+ (% (, (intern (format "sha1-%s-low" H))) 65536))
+ (setq (, (intern (format "sha1-%s-high" H)))
+ (% (+ (, (intern (format "sha1-%s-high" H)))
+ (, (intern (format "sha1-%s-high" X)))
+ carry)
+ 65536)))))
)
-(defun sha1-update (bytes)
- "Update the current SHA1 state with BYTES (an string of uni-bytes)."
- (setq bytes (string-as-unibyte bytes))
- (let* ((len (length bytes))
- (len32 (sha1-32-make len))
- (tmp32 (cons 0 0))
- (top 0)
- (clo (cons 0 0))
- i done)
- (sha1-add clo sha1-count-lo (sha1-lsh tmp32 len32 3))
- (when (sha1-< clo sha1-count-lo)
- (sha1-inc sha1-count-hi))
- (setq sha1-count-lo clo)
- (sha1-add sha1-count-hi (sha1-rsh tmp32 len32 29))
- (when (> (length sha1-data) 0)
- (setq i (- SHA1-BLOCKSIZE (length sha1-data)))
- (when (> i len)
- (setq i len))
- (setq sha1-data (concat sha1-data (substring bytes 0 i)))
- (setq len (- len i)
- top i)
- (if (eq (length sha1-data) SHA1-BLOCKSIZE)
- (sha1-transform)
- (setq done t)))
- (when (not done)
- (while (and (not done)
- (>= len SHA1-BLOCKSIZE))
- (setq sha1-data (substring bytes top (+ top SHA1-BLOCKSIZE))
- top (+ top SHA1-BLOCKSIZE)
- len (- len SHA1-BLOCKSIZE))
- (sha1-transform))
- (setq sha1-data (substring bytes top (+ top len))))
- ))
-
-(defmacro sha1-FA (n)
- (let ((func (intern (format "sha1-f%d" n)))
- (const (intern (format "sha1-const%d" n))))
- `(setq T (sha1-add (cons 0 0) (sha1-rot-5 A) (,func B C D) E (aref W WIDX)
- ,const)
- WIDX (1+ WIDX)
- B (sha1-rot-30 B))))
-
-(defmacro sha1-FB (n)
- (let ((func (intern (format "sha1-f%d" n)))
- (const (intern (format "sha1-const%d" n))))
- `(setq E (sha1-add (cons 0 0) (sha1-rot-5 T) (,func A B C) D (aref W WIDX)
- ,const)
- WIDX (1+ WIDX)
- A (sha1-rot-30 A))))
-
-(defmacro sha1-FC (n)
- (let ((func (intern (format "sha1-f%d" n)))
- (const (intern (format "sha1-const%d" n))))
- `(setq D (sha1-add (cons 0 0) (sha1-rot-5 E) (,func T A B) C (aref W WIDX)
- ,const)
- WIDX (1+ WIDX)
- T (sha1-rot-30 T))))
-
-(defmacro sha1-FD (n)
- (let ((func (intern (format "sha1-f%d" n)))
- (const (intern (format "sha1-const%d" n))))
- `(setq C (sha1-add (cons 0 0) (sha1-rot-5 D) (,func E T A) B (aref W WIDX)
- ,const)
- WIDX (1+ WIDX)
- E (sha1-rot-30 E))))
-
-(defmacro sha1-FE (n)
- (let ((func (intern (format "sha1-f%d" n)))
- (const (intern (format "sha1-const%d" n))))
- `(setq B (sha1-add (cons 0 0) (sha1-rot-5 C) (,func D E T) A (aref W WIDX)
- ,const)
- WIDX (1+ WIDX)
- D (sha1-rot-30 D))))
-
-(defmacro sha1-FT (n)
- (let ((func (intern (format "sha1-f%d" n)))
- (const (intern (format "sha1-const%d" n))))
- `(setq A (sha1-add (cons 0 0) (sha1-rot-5 B) (,func C D E) T (aref W WIDX)
- ,const)
- WIDX (1+ WIDX)
- C (sha1-rot-30 C))))
-
-(defun sha1-transform ()
- "Basic SHA1 step. Transform sha1-digest based on sha1-data."
- (let ((W (make-vector 80 nil))
- (WIDX 0)
- (bidx 0)
- T A B C D E)
- (while (< WIDX 16)
- (aset W WIDX
- (cons (logior (lsh (aref sha1-data bidx) 8)
- (aref sha1-data (setq bidx (1+ bidx))))
- (logior (lsh (aref sha1-data (setq bidx (1+ bidx))) 8)
- (aref sha1-data (setq bidx (1+ bidx))))))
- (setq bidx (1+ bidx)
- WIDX (1+ WIDX)))
- (while (< WIDX 80)
- (aset W WIDX (cons 0 0))
- (sha1-xor (aref W WIDX)
- (aref W (- WIDX 3)) (aref W (- WIDX 8))
- (aref W (- WIDX 14)) (aref W (- WIDX 16)))
- (aset W WIDX (sha1-rot-1 (aref W WIDX)))
- (setq WIDX (1+ WIDX)))
- (setq A (cons (car (aref sha1-digest 0)) (cdr (aref sha1-digest 0)))
- B (cons (car (aref sha1-digest 1)) (cdr (aref sha1-digest 1)))
- C (cons (car (aref sha1-digest 2)) (cdr (aref sha1-digest 2)))
- D (cons (car (aref sha1-digest 3)) (cdr (aref sha1-digest 3)))
- E (cons (car (aref sha1-digest 4)) (cdr (aref sha1-digest 4)))
- WIDX 0)
-
- (sha1-FA 1) (sha1-FB 1) (sha1-FC 1) (sha1-FD 1) (sha1-FE 1) (sha1-FT 1)
- (sha1-FA 1) (sha1-FB 1) (sha1-FC 1) (sha1-FD 1) (sha1-FE 1) (sha1-FT 1)
- (sha1-FA 1) (sha1-FB 1) (sha1-FC 1) (sha1-FD 1) (sha1-FE 1) (sha1-FT 1)
- (sha1-FA 1) (sha1-FB 1) (sha1-FC 2) (sha1-FD 2) (sha1-FE 2) (sha1-FT 2)
- (sha1-FA 2) (sha1-FB 2) (sha1-FC 2) (sha1-FD 2) (sha1-FE 2) (sha1-FT 2)
- (sha1-FA 2) (sha1-FB 2) (sha1-FC 2) (sha1-FD 2) (sha1-FE 2) (sha1-FT 2)
- (sha1-FA 2) (sha1-FB 2) (sha1-FC 2) (sha1-FD 2) (sha1-FE 3) (sha1-FT 3)
- (sha1-FA 3) (sha1-FB 3) (sha1-FC 3) (sha1-FD 3) (sha1-FE 3) (sha1-FT 3)
- (sha1-FA 3) (sha1-FB 3) (sha1-FC 3) (sha1-FD 3) (sha1-FE 3) (sha1-FT 3)
- (sha1-FA 3) (sha1-FB 3) (sha1-FC 3) (sha1-FD 3) (sha1-FE 3) (sha1-FT 3)
- (sha1-FA 4) (sha1-FB 4) (sha1-FC 4) (sha1-FD 4) (sha1-FE 4) (sha1-FT 4)
- (sha1-FA 4) (sha1-FB 4) (sha1-FC 4) (sha1-FD 4) (sha1-FE 4) (sha1-FT 4)
- (sha1-FA 4) (sha1-FB 4) (sha1-FC 4) (sha1-FD 4) (sha1-FE 4) (sha1-FT 4)
- (sha1-FA 4) (sha1-FB 4)
-
- (sha1-add (aref sha1-digest 0) E)
- (sha1-add (aref sha1-digest 1) T)
- (sha1-add (aref sha1-digest 2) A)
- (sha1-add (aref sha1-digest 3) B)
- (sha1-add (aref sha1-digest 4) C)
- ))
-
-(defun sha1-final (&optional binary)
- "Transform buffered sha1-data and return SHA1 message digest.
-If optional argument BINARY is non-nil, then return binary formed
-string of message digest."
- (let ((count (logand (lsh (cdr sha1-count-lo) -3) 63)))
- (when (< (length sha1-data) SHA1-BLOCKSIZE)
- (setq sha1-data
- (concat sha1-data
- (make-string (- SHA1-BLOCKSIZE (length sha1-data)) 0))))
- (aset sha1-data count 128)
- (setq count (1+ count))
- (if (> count (- SHA1-BLOCKSIZE 8))
- (progn
- (setq sha1-data (concat (substring sha1-data 0 count)
- (make-string (- SHA1-BLOCKSIZE count) 0)))
- (sha1-transform)
- (setq sha1-data (concat (make-string (- SHA1-BLOCKSIZE 8) 0)
- (substring sha1-data -8))))
- (setq sha1-data (concat (substring sha1-data 0 count)
- (make-string (- SHA1-BLOCKSIZE 8 count) 0)
- (substring sha1-data -8))))
- (aset sha1-data 56 (lsh (car sha1-count-hi) -8))
- (aset sha1-data 57 (logand 255 (car sha1-count-hi)))
- (aset sha1-data 58 (lsh (cdr sha1-count-hi) -8))
- (aset sha1-data 59 (logand 255 (cdr sha1-count-hi)))
- (aset sha1-data 60 (lsh (car sha1-count-lo) -8))
- (aset sha1-data 61 (logand 255 (car sha1-count-lo)))
- (aset sha1-data 62 (lsh (cdr sha1-count-lo) -8))
- (aset sha1-data 63 (logand 255 (cdr sha1-count-lo)))
- (sha1-transform)
- (if binary
- (mapconcat
- (lambda (elem)
- (concat (char-to-string (/ (car elem) 256))
- (char-to-string (% (car elem) 256))
- (char-to-string (/ (cdr elem) 256))
- (char-to-string (% (cdr elem) 256))))
- (list (aref sha1-digest 0) (aref sha1-digest 1) (aref sha1-digest 2)
- (aref sha1-digest 3) (aref sha1-digest 4))
- "")
- (format "%04x%04x%04x%04x%04x%04x%04x%04x%04x%04x"
- (car (aref sha1-digest 0)) (cdr (aref sha1-digest 0))
- (car (aref sha1-digest 1)) (cdr (aref sha1-digest 1))
- (car (aref sha1-digest 2)) (cdr (aref sha1-digest 2))
- (car (aref sha1-digest 3)) (cdr (aref sha1-digest 3))
- (car (aref sha1-digest 4)) (cdr (aref sha1-digest 4)))
- )))
-
-(defun sha1-encode (message &optional binary)
- "Encodes MESSAGE using the SHA1 message digest algorithm.
-MESSAGE must be a unibyte-string.
-By default, return a string which formed hex-decimal charcters
-from message digest.
-If optional argument BINARY is non-nil, then return binary formed
-string of message digest."
- (sha1-init)
- (sha1-update message)
- (sha1-final binary))
-
-(defun sha1-encode-binary (message)
- "Encodes MESSAGE using the SHA1 message digest algorithm.
-MESSAGE must be a unibyte-string.
-Return binary formed string of message digest."
- (sha1-encode message 'binary))
-
-(provide 'sha1)
-
-;;; sha1.el ends here
+;;; buffers (H0 H1 H2 H3 H4).
+(defvar sha1-H0-high)
+(defvar sha1-H0-low)
+(defvar sha1-H1-high)
+(defvar sha1-H1-low)
+(defvar sha1-H2-high)
+(defvar sha1-H2-low)
+(defvar sha1-H3-high)
+(defvar sha1-H3-low)
+(defvar sha1-H4-high)
+(defvar sha1-H4-low)
+
+(defun sha1-block (block-high block-low)
+ (let (;; step (c) --- initialize buffers (A B C D E).
+ (sha1-A-high sha1-H0-high) (sha1-A-low sha1-H0-low)
+ (sha1-B-high sha1-H1-high) (sha1-B-low sha1-H1-low)
+ (sha1-C-high sha1-H2-high) (sha1-C-low sha1-H2-low)
+ (sha1-D-high sha1-H3-high) (sha1-D-low sha1-H3-low)
+ (sha1-E-high sha1-H4-high) (sha1-E-low sha1-H4-low)
+ (idx 16))
+ ;; step (b).
+ (let (;; temporary variables used in sha1-S1 macro.
+ S1W-high S1W-low)
+ (while (< idx 80)
+ (sha1-S1 (logxor (aref block-high (- idx 3))
+ (aref block-high (- idx 8))
+ (aref block-high (- idx 14))
+ (aref block-high (- idx 16)))
+ (logxor (aref block-low (- idx 3))
+ (aref block-low (- idx 8))
+ (aref block-low (- idx 14))
+ (aref block-low (- idx 16))))
+ (aset block-high idx S1W-high)
+ (aset block-low idx S1W-low)
+ (setq idx (1+ idx))))
+ ;; step (d).
+ (setq idx 0)
+ (let (;; temporary variables used in sha1-OP macro.
+ S5A-high S5A-low S30B-high S30B-low carry)
+ (while (< idx 20) (sha1-OP 0) (setq idx (1+ idx)))
+ (while (< idx 40) (sha1-OP 1) (setq idx (1+ idx)))
+ (while (< idx 60) (sha1-OP 2) (setq idx (1+ idx)))
+ (while (< idx 80) (sha1-OP 3) (setq idx (1+ idx))))
+ ;; step (e).
+ (let (;; temporary variables used in sha1-add-to-H macro.
+ carry)
+ (sha1-add-to-H H0 A)
+ (sha1-add-to-H H1 B)
+ (sha1-add-to-H H2 C)
+ (sha1-add-to-H H3 D)
+ (sha1-add-to-H H4 E))))
+
+(defun sha1-binary (string)
+ "Return the SHA1 of STRING in binary form."
+ (let (;; prepare buffers for a block. byte-length of block is 64.
+ ;; input block is split into two vectors.
+ ;;
+ ;; input block: 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F ...
+ ;; block-high: +-0-+ +-1-+ +-2-+ +-3-+
+ ;; block-low: +-0-+ +-1-+ +-2-+ +-3-+
+ ;;
+ ;; length of each vector is 80, and elements of each vector are
+ ;; 16bit integers. elements 0x10-0x4F of each vector are
+ ;; assigned later in `sha1-block'.
+ (block-high (eval-when-compile (make-vector 80 nil)))
+ (block-low (eval-when-compile (make-vector 80 nil))))
+ (unwind-protect
+ (let* (;; byte-length of input string.
+ (len (length string))
+ (lim (* (/ len 64) 64))
+ (rem (% len 4))
+ (idx 0)(pos 0))
+ ;; initialize buffers (H0 H1 H2 H3 H4).
+ (setq sha1-H0-high 26437 ; (string-to-number "6745" 16)
+ sha1-H0-low 8961 ; (string-to-number "2301" 16)
+ sha1-H1-high 61389 ; (string-to-number "EFCD" 16)
+ sha1-H1-low 43913 ; (string-to-number "AB89" 16)
+ sha1-H2-high 39098 ; (string-to-number "98BA" 16)
+ sha1-H2-low 56574 ; (string-to-number "DCFE" 16)
+ sha1-H3-high 4146 ; (string-to-number "1032" 16)
+ sha1-H3-low 21622 ; (string-to-number "5476" 16)
+ sha1-H4-high 50130 ; (string-to-number "C3D2" 16)
+ sha1-H4-low 57840) ; (string-to-number "E1F0" 16)
+ ;; loop for each 64 bytes block.
+ (while (< pos lim)
+ ;; step (a).
+ (setq idx 0)
+ (while (< idx 16)
+ (aset block-high idx (+ (* (aref string pos) 256)
+ (aref string (1+ pos))))
+ (setq pos (+ pos 2))
+ (aset block-low idx (+ (* (aref string pos) 256)
+ (aref string (1+ pos))))
+ (setq pos (+ pos 2))
+ (setq idx (1+ idx)))
+ (sha1-block block-high block-low))
+ ;; last block.
+ (if (prog1
+ (< (- len lim) 56)
+ (setq lim (- len rem))
+ (setq idx 0)
+ (while (< pos lim)
+ (aset block-high idx (+ (* (aref string pos) 256)
+ (aref string (1+ pos))))
+ (setq pos (+ pos 2))
+ (aset block-low idx (+ (* (aref string pos) 256)
+ (aref string (1+ pos))))
+ (setq pos (+ pos 2))
+ (setq idx (1+ idx)))
+ ;; this is the last (at most) 32bit word.
+ (cond
+ ((= rem 3)
+ (aset block-high idx (+ (* (aref string pos) 256)
+ (aref string (1+ pos))))
+ (setq pos (+ pos 2))
+ (aset block-low idx (+ (* (aref string pos) 256)
+ 128)))
+ ((= rem 2)
+ (aset block-high idx (+ (* (aref string pos) 256)
+ (aref string (1+ pos))))
+ (aset block-low idx 32768))
+ ((= rem 1)
+ (aset block-high idx (+ (* (aref string pos) 256)
+ 128))
+ (aset block-low idx 0))
+ (t ;; (= rem 0)
+ (aset block-high idx 32768)
+ (aset block-low idx 0)))
+ (setq idx (1+ idx))
+ (while (< idx 16)
+ (aset block-high idx 0)
+ (aset block-low idx 0)
+ (setq idx (1+ idx))))
+ ;; last block has enough room to write the length of string.
+ (progn
+ ;; write bit length of string to last 4 bytes of the block.
+ (aset block-low 15 (* (% len 8192) 8))
+ (setq len (/ len 8192))
+ (aset block-high 15 (% len 65536))
+ ;; XXX: It is not practical to compute SHA1 of
+ ;; such a huge message on emacs.
+ ;; (setq len (/ len 65536)) ; for 64bit emacs.
+ ;; (aset block-low 14 (% len 65536))
+ ;; (aset block-high 14 (/ len 65536))
+ (sha1-block block-high block-low))
+ ;; need one more block.
+ (sha1-block block-high block-low)
+ (fillarray block-high 0)
+ (fillarray block-low 0)
+ ;; write bit length of string to last 4 bytes of the block.
+ (aset block-low 15 (* (% len 8192) 8))
+ (setq len (/ len 8192))
+ (aset block-high 15 (% len 65536))
+ ;; XXX: It is not practical to compute SHA1 of
+ ;; such a huge message on emacs.
+ ;; (setq len (/ len 65536)) ; for 64bit emacs.
+ ;; (aset block-low 14 (% len 65536))
+ ;; (aset block-high 14 (/ len 65536))
+ (sha1-block block-high block-low))
+ ;; make output string (in binary form).
+ (let ((result (make-string 20 0)))
+ (aset result 0 (/ sha1-H0-high 256))
+ (aset result 1 (% sha1-H0-high 256))
+ (aset result 2 (/ sha1-H0-low 256))
+ (aset result 3 (% sha1-H0-low 256))
+ (aset result 4 (/ sha1-H1-high 256))
+ (aset result 5 (% sha1-H1-high 256))
+ (aset result 6 (/ sha1-H1-low 256))
+ (aset result 7 (% sha1-H1-low 256))
+ (aset result 8 (/ sha1-H2-high 256))
+ (aset result 9 (% sha1-H2-high 256))
+ (aset result 10 (/ sha1-H2-low 256))
+ (aset result 11 (% sha1-H2-low 256))
+ (aset result 12 (/ sha1-H3-high 256))
+ (aset result 13 (% sha1-H3-high 256))
+ (aset result 14 (/ sha1-H3-low 256))
+ (aset result 15 (% sha1-H3-low 256))
+ (aset result 16 (/ sha1-H4-high 256))
+ (aset result 17 (% sha1-H4-high 256))
+ (aset result 18 (/ sha1-H4-low 256))
+ (aset result 19 (% sha1-H4-low 256))
+ result))
+ ;; do not leave a copy of input string.
+ (fillarray block-high nil)
+ (fillarray block-low nil))))
+
+(defun sha1-string-internal (string)
+ (encode-hex-string (sha1-binary string)))
+
+(defun sha1-region-internal (beg end)
+ (sha1-string-internal (buffer-substring-no-properties beg end)))
+
+;;;
+;;; application interface.
+;;;
+
+(defun sha1-region (beg end)
+ (if (and sha1-maximum-internal-length
+ (> (abs (- end beg)) sha1-maximum-internal-length))
+ (sha1-region-external beg end)
+ (sha1-region-internal beg end)))
+
+(defun sha1-string (string)
+ (if (and sha1-maximum-internal-length
+ (> (length string) sha1-maximum-internal-length))
+ (sha1-string-external string)
+ (sha1-string-internal string)))
+
+(defun sha1 (object &optional beg end)
+ "Return the SHA1 (Secure Hash Algorithm) of an object.
+OBJECT is either a string or a buffer.
+Optional arguments BEG and END denote buffer positions for computing the
+hash of a portion of OBJECT."
+ (if (stringp object)
+ (sha1-string object)
+ (save-excursion
+ (set-buffer object)
+ (sha1-region (or beg (point-min)) (or end (point-max))))))
+
+(provide 'sha1-el)
+
+;;; sha1-el.el ends here
projects / elisp / flim.git / blobdiff