+++ /dev/null
-;;; sha1.el --- SHA1 Secure Hash Algorithm in Emacs-Lisp
-
-;; Copyright (C) 1999, 2001, 2003, 2004 Free Software Foundation, Inc.
-
-;; 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
-;; GNU General Public License for more details.
-
-;; 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 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)
-;;
-;; Test cases from FIPS PUB 180-1.
-;;
-;; (sha1 "abc")
-;; => a9993e364706816aba3e25717850c26c9cd0d89d
-;;
-;; (sha1 "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq")
-;; => 84983e441c3bd26ebaae4aa1f95129e5e54670f1
-;;
-;; (sha1 (make-string 1000000 ?a))
-;; => 34aa973cd4c4daa4f61eeb2bdbad27316534016f
-;;
-;; 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.
-;;
-;; TODO:
-;; * Rewrite from scratch!
-;; This version is much faster than Keiichi Suzuki's another sha1.el,
-;; but it is too dirty.
-
-;;; Code:
-
-(require 'hex-util)
-
-;;;
-;;; external SHA1 function.
-;;;
-
-(defgroup sha1 nil
- "Elisp interface for SHA1 hash computation."
- :group 'extensions)
-
-(defcustom 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 external program only.
-If this variable is set to nil, use internal function only."
- :type 'integer
- :group 'sha1)
-
-(defcustom sha1-program '("sha1sum")
- "*Name of program to compute SHA1.
-It must be a string \(program name\) or list of strings \(name and its args\)."
- :type '(repeat string)
- :group 'sha1)
-
-(defcustom sha1-use-external (condition-case ()
- (executable-find (car sha1-program))
- (error))
- "*Use external SHA1 program.
-If this variable is set to nil, use internal function only."
- :type 'boolean
- :group 'sha1)
-
-(defun sha1-string-external (string &optional binary)
- (let (prog args digest default-enable-multibyte-characters)
- (if (consp sha1-program)
- (setq prog (car sha1-program)
- args (cdr sha1-program))
- (setq prog sha1-program
- args nil))
- (with-temp-buffer
- (insert string)
- (apply (function call-process-region)
- (point-min)(point-max)
- prog t t nil args)
- ;; SHA1 is 40 bytes long in hexadecimal form.
- (setq digest (buffer-substring (point-min)(+ (point-min) 40))))
- (if binary
- (decode-hex-string digest)
- digest)))
-
-(defun sha1-region-external (beg end &optional binary)
- (sha1-string-external (buffer-substring-no-properties beg end) binary))
-
-;;;
-;;; 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)))))
- )
-
-;;; 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 &optional binary)
- (if binary
- (sha1-binary string)
- (encode-hex-string (sha1-binary string))))
-
-(defun sha1-region-internal (beg end &optional binary)
- (sha1-string-internal (buffer-substring-no-properties beg end) binary))
-
-;;;
-;;; application interface.
-;;;
-
-(defun sha1-region (beg end &optional binary)
- (if (and sha1-use-external
- sha1-maximum-internal-length
- (> (abs (- end beg)) sha1-maximum-internal-length))
- (sha1-region-external beg end binary)
- (sha1-region-internal beg end binary)))
-
-(defun sha1-string (string &optional binary)
- (if (and sha1-use-external
- sha1-maximum-internal-length
- (> (length string) sha1-maximum-internal-length))
- (sha1-string-external string binary)
- (sha1-string-internal string binary)))
-
-;;;###autoload
-(defun sha1 (object &optional beg end binary)
- "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 BINARY is non-nil, return a string in binary form."
- (if (stringp object)
- (sha1-string object binary)
- (save-excursion
- (set-buffer object)
- (sha1-region (or beg (point-min)) (or end (point-max)) binary))))
-
-(provide 'sha1)
-
-;;; arch-tag: c0f9abd0-ffc1-4557-aac6-ece7f2d4c901
-;;; sha1.el ends here
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