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[Emacs-diffs] Changes to emacs/lisp/gnus/sha1.el [lexbind]


From: Miles Bader
Subject: [Emacs-diffs] Changes to emacs/lisp/gnus/sha1.el [lexbind]
Date: Wed, 15 Sep 2004 20:34:30 -0400

Index: emacs/lisp/gnus/sha1.el
diff -c /dev/null emacs/lisp/gnus/sha1.el:1.1.4.1
*** /dev/null   Thu Sep 16 00:13:22 2004
--- emacs/lisp/gnus/sha1.el     Thu Sep 16 00:12:15 2004
***************
*** 0 ****
--- 1,441 ----
+ ;;; sha1.el --- SHA1 Secure Hash Algorithm in Emacs-Lisp
+ 
+ ;; Copyright (C) 1999, 2001, 2003, 2004 Free Software Foundation, Inc.
+ 
+ ;; Author: Shuhei KOBAYASHI <address@hidden>
+ ;; 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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