From: tomo Date: Tue, 4 Jun 2002 03:06:58 +0000 (+0000) Subject: Revert previous changes. X-Git-Tag: Emacs-21_1-LEMI-1_14-0~1 X-Git-Url: http://git.chise.org/gitweb/?p=elisp%2Flemi.git;a=commitdiff_plain;h=13a43cd8b6a551a401faac658e75058ddbd4384c Revert previous changes. --- diff --git a/mail/sha1.el b/mail/sha1.el index a9e5e9d..1690944 100644 --- a/mail/sha1.el +++ b/mail/sha1.el @@ -1,4 +1,4 @@ -;;; sha1.el --- SHA1 Secure Hash Algorithm. +;;; sha1.el --- SHA1 Secure Hash Algorithm in Emacs-Lisp. ;; Copyright (C) 1999, 2001 Free Software Foundation, Inc. @@ -24,8 +24,13 @@ ;;; Commentary: -;; Examples from FIPS PUB 180-1. +;; 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". ;; +;; (EXCEPTION; two optimizations taken from GnuPG/cipher/sha1.c) +;; +;; Test cases from FIPS PUB 180-1. ;; ;; (sha1 "abc") ;; => a9993e364706816aba3e25717850c26c9cd0d89d @@ -35,29 +40,383 @@ ;; ;; (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: -(defvar sha1-dl-module - (cond - ((and (fboundp 'sha1) - (subrp (symbol-function 'sha1))) - nil) - ((fboundp 'dynamic-link) - ;; Should we take care of `dynamic-link-path'? - (let ((path (expand-file-name "sha1.so" exec-directory))) - (if (file-exists-p path) - path - nil))) - (t - nil))) - -(cond - ((and (stringp sha1-dl-module) - (file-exists-p sha1-dl-module)) - (require 'sha1-dl)) - (t - (require 'sha1-el))) +(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))))) + ) + +;;; 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)