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442 lines
16 KiB
EmacsLisp
442 lines
16 KiB
EmacsLisp
;;; sha1.el --- SHA1 Secure Hash Algorithm in Emacs-Lisp
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;; Copyright (C) 1999, 2001-2011 Free Software Foundation, Inc.
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;; Author: Shuhei KOBAYASHI <shuhei@aqua.ocn.ne.jp>
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;; Keywords: SHA1, FIPS 180-1
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This program is implemented from the definition of SHA-1 in FIPS PUB
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;; 180-1 (Federal Information Processing Standards Publication 180-1),
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;; "Announcing the Standard for SECURE HASH STANDARD".
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;; <URL:http://www.itl.nist.gov/div897/pubs/fip180-1.htm>
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;; (EXCEPTION; two optimizations taken from GnuPG/cipher/sha1.c)
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;;
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;; Test cases from FIPS PUB 180-1.
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;;
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;; (sha1 "abc")
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;; => a9993e364706816aba3e25717850c26c9cd0d89d
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;;
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;; (sha1 "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq")
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;; => 84983e441c3bd26ebaae4aa1f95129e5e54670f1
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;;
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;; (sha1 (make-string 1000000 ?a))
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;; => 34aa973cd4c4daa4f61eeb2bdbad27316534016f
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;;
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;; BUGS:
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;; * It is assumed that length of input string is less than 2^29 bytes.
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;; * It is caller's responsibility to make string (or region) unibyte.
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;;
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;; TODO:
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;; * Rewrite from scratch!
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;; This version is much faster than Keiichi Suzuki's another sha1.el,
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;; but it is too dirty.
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;;; Code:
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(require 'hex-util)
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;;;
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;;; external SHA1 function.
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;;;
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(defgroup sha1 nil
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"Elisp interface for SHA1 hash computation."
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:version "22.1"
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:group 'extensions)
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(defcustom sha1-maximum-internal-length 500
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"Maximum length of message to use Lisp version of SHA1 function.
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If message is longer than this, `sha1-program' is used instead.
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If this variable is set to 0, use external program only.
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If this variable is set to nil, use internal function only."
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:type 'integer
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:group 'sha1)
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(defcustom sha1-program '("sha1sum")
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"Name of program to compute SHA1.
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It must be a string \(program name\) or list of strings \(name and its args\)."
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:type '(repeat string)
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:group 'sha1)
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(defcustom sha1-use-external (condition-case ()
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(executable-find (car sha1-program))
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(error))
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"Use external SHA1 program.
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If this variable is set to nil, use internal function only."
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:type 'boolean
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:group 'sha1)
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(defun sha1-string-external (string &optional binary)
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(let ((default-directory "/") ;; in case otherwise non-existent
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(process-connection-type nil) ;; pipe
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prog args digest)
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(if (consp sha1-program)
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(setq prog (car sha1-program)
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args (cdr sha1-program))
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(setq prog sha1-program
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args nil))
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(with-temp-buffer
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(unless (featurep 'xemacs) (set-buffer-multibyte nil))
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(insert string)
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(apply (function call-process-region)
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(point-min) (point-max)
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prog t t nil args)
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;; SHA1 is 40 bytes long in hexadecimal form.
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(setq digest (buffer-substring (point-min)(+ (point-min) 40))))
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(if binary
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(decode-hex-string digest)
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digest)))
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(defun sha1-region-external (beg end &optional binary)
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(sha1-string-external (buffer-substring-no-properties beg end) binary))
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;;;
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;;; internal SHA1 function.
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;;;
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(eval-when-compile
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;; optional second arg of string-to-number is new in v20.
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(defconst sha1-K0-high 23170) ; (string-to-number "5A82" 16)
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(defconst sha1-K0-low 31129) ; (string-to-number "7999" 16)
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(defconst sha1-K1-high 28377) ; (string-to-number "6ED9" 16)
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(defconst sha1-K1-low 60321) ; (string-to-number "EBA1" 16)
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(defconst sha1-K2-high 36635) ; (string-to-number "8F1B" 16)
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(defconst sha1-K2-low 48348) ; (string-to-number "BCDC" 16)
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(defconst sha1-K3-high 51810) ; (string-to-number "CA62" 16)
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(defconst sha1-K3-low 49622) ; (string-to-number "C1D6" 16)
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;; original definition of sha1-F0.
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;; (defmacro sha1-F0 (B C D)
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;; (` (logior (logand (, B) (, C))
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;; (logand (lognot (, B)) (, D)))))
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;; a little optimization from GnuPG/cipher/sha1.c.
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(defmacro sha1-F0 (B C D)
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`(logxor ,D (logand ,B (logxor ,C ,D))))
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(defmacro sha1-F1 (B C D)
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`(logxor ,B ,C ,D))
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;; original definition of sha1-F2.
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;; (defmacro sha1-F2 (B C D)
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;; (` (logior (logand (, B) (, C))
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;; (logand (, B) (, D))
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;; (logand (, C) (, D)))))
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;; a little optimization from GnuPG/cipher/sha1.c.
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(defmacro sha1-F2 (B C D)
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`(logior (logand ,B ,C)
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(logand ,D (logior ,B ,C))))
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(defmacro sha1-F3 (B C D)
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`(logxor ,B ,C ,D))
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(defmacro sha1-S1 (W-high W-low)
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`(let ((W-high ,W-high)
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(W-low ,W-low))
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(setq S1W-high (+ (% (* W-high 2) 65536)
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(/ W-low ,(/ 65536 2))))
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(setq S1W-low (+ (/ W-high ,(/ 65536 2))
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(% (* W-low 2) 65536)))))
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(defmacro sha1-S5 (A-high A-low)
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`(progn
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(setq S5A-high (+ (% (* ,A-high 32) 65536)
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(/ ,A-low ,(/ 65536 32))))
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(setq S5A-low (+ (/ ,A-high ,(/ 65536 32))
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(% (* ,A-low 32) 65536)))))
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(defmacro sha1-S30 (B-high B-low)
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`(progn
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(setq S30B-high (+ (/ ,B-high 4)
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(* (% ,B-low 4) ,(/ 65536 4))))
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(setq S30B-low (+ (/ ,B-low 4)
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(* (% ,B-high 4) ,(/ 65536 4))))))
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(defmacro sha1-OP (round)
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`(progn
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(sha1-S5 sha1-A-high sha1-A-low)
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(sha1-S30 sha1-B-high sha1-B-low)
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(setq sha1-A-low (+ (,(intern (format "sha1-F%d" round))
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sha1-B-low sha1-C-low sha1-D-low)
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sha1-E-low
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,(symbol-value
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(intern (format "sha1-K%d-low" round)))
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(aref block-low idx)
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(progn
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(setq sha1-E-low sha1-D-low)
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(setq sha1-D-low sha1-C-low)
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(setq sha1-C-low S30B-low)
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(setq sha1-B-low sha1-A-low)
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S5A-low)))
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(setq carry (/ sha1-A-low 65536))
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(setq sha1-A-low (% sha1-A-low 65536))
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(setq sha1-A-high (% (+ (,(intern (format "sha1-F%d" round))
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sha1-B-high sha1-C-high sha1-D-high)
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sha1-E-high
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,(symbol-value
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(intern (format "sha1-K%d-high" round)))
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(aref block-high idx)
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(progn
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(setq sha1-E-high sha1-D-high)
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(setq sha1-D-high sha1-C-high)
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(setq sha1-C-high S30B-high)
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(setq sha1-B-high sha1-A-high)
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S5A-high)
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carry)
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65536))))
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(defmacro sha1-add-to-H (H X)
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`(progn
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(setq ,(intern (format "sha1-%s-low" H))
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(+ ,(intern (format "sha1-%s-low" H))
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,(intern (format "sha1-%s-low" X))))
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(setq carry (/ ,(intern (format "sha1-%s-low" H)) 65536))
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(setq ,(intern (format "sha1-%s-low" H))
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(% ,(intern (format "sha1-%s-low" H)) 65536))
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(setq ,(intern (format "sha1-%s-high" H))
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(% (+ ,(intern (format "sha1-%s-high" H))
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,(intern (format "sha1-%s-high" X))
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carry)
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65536))))
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)
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;;; buffers (H0 H1 H2 H3 H4).
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(defvar sha1-H0-high)
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(defvar sha1-H0-low)
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(defvar sha1-H1-high)
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(defvar sha1-H1-low)
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(defvar sha1-H2-high)
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(defvar sha1-H2-low)
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(defvar sha1-H3-high)
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(defvar sha1-H3-low)
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(defvar sha1-H4-high)
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(defvar sha1-H4-low)
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(defun sha1-block (block-high block-low)
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(let (;; step (c) --- initialize buffers (A B C D E).
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(sha1-A-high sha1-H0-high) (sha1-A-low sha1-H0-low)
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(sha1-B-high sha1-H1-high) (sha1-B-low sha1-H1-low)
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(sha1-C-high sha1-H2-high) (sha1-C-low sha1-H2-low)
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(sha1-D-high sha1-H3-high) (sha1-D-low sha1-H3-low)
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(sha1-E-high sha1-H4-high) (sha1-E-low sha1-H4-low)
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(idx 16))
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;; step (b).
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(let (;; temporary variables used in sha1-S1 macro.
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S1W-high S1W-low)
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(while (< idx 80)
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(sha1-S1 (logxor (aref block-high (- idx 3))
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(aref block-high (- idx 8))
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(aref block-high (- idx 14))
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(aref block-high (- idx 16)))
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(logxor (aref block-low (- idx 3))
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(aref block-low (- idx 8))
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(aref block-low (- idx 14))
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(aref block-low (- idx 16))))
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(aset block-high idx S1W-high)
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(aset block-low idx S1W-low)
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(setq idx (1+ idx))))
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;; step (d).
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(setq idx 0)
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(let (;; temporary variables used in sha1-OP macro.
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S5A-high S5A-low S30B-high S30B-low carry)
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(while (< idx 20) (sha1-OP 0) (setq idx (1+ idx)))
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(while (< idx 40) (sha1-OP 1) (setq idx (1+ idx)))
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(while (< idx 60) (sha1-OP 2) (setq idx (1+ idx)))
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(while (< idx 80) (sha1-OP 3) (setq idx (1+ idx))))
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;; step (e).
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(let (;; temporary variables used in sha1-add-to-H macro.
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carry)
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(sha1-add-to-H H0 A)
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(sha1-add-to-H H1 B)
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(sha1-add-to-H H2 C)
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(sha1-add-to-H H3 D)
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(sha1-add-to-H H4 E))))
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(defun sha1-binary (string)
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"Return the SHA1 of STRING in binary form."
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(let (;; prepare buffers for a block. byte-length of block is 64.
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;; input block is split into two vectors.
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;;
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;; input block: 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F ...
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;; block-high: +-0-+ +-1-+ +-2-+ +-3-+
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;; block-low: +-0-+ +-1-+ +-2-+ +-3-+
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;;
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;; length of each vector is 80, and elements of each vector are
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;; 16bit integers. elements 0x10-0x4F of each vector are
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;; assigned later in `sha1-block'.
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(block-high (eval-when-compile (make-vector 80 nil)))
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(block-low (eval-when-compile (make-vector 80 nil))))
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(unwind-protect
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(let* (;; byte-length of input string.
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(len (length string))
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(lim (* (/ len 64) 64))
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(rem (% len 4))
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(idx 0)(pos 0))
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;; initialize buffers (H0 H1 H2 H3 H4).
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(setq sha1-H0-high 26437 ; (string-to-number "6745" 16)
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sha1-H0-low 8961 ; (string-to-number "2301" 16)
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sha1-H1-high 61389 ; (string-to-number "EFCD" 16)
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sha1-H1-low 43913 ; (string-to-number "AB89" 16)
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sha1-H2-high 39098 ; (string-to-number "98BA" 16)
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sha1-H2-low 56574 ; (string-to-number "DCFE" 16)
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sha1-H3-high 4146 ; (string-to-number "1032" 16)
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sha1-H3-low 21622 ; (string-to-number "5476" 16)
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sha1-H4-high 50130 ; (string-to-number "C3D2" 16)
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sha1-H4-low 57840) ; (string-to-number "E1F0" 16)
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;; loop for each 64 bytes block.
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(while (< pos lim)
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;; step (a).
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(setq idx 0)
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(while (< idx 16)
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(aset block-high idx (+ (* (aref string pos) 256)
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(aref string (1+ pos))))
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(setq pos (+ pos 2))
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(aset block-low idx (+ (* (aref string pos) 256)
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(aref string (1+ pos))))
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(setq pos (+ pos 2))
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(setq idx (1+ idx)))
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(sha1-block block-high block-low))
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;; last block.
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(if (prog1
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(< (- len lim) 56)
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(setq lim (- len rem))
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(setq idx 0)
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(while (< pos lim)
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(aset block-high idx (+ (* (aref string pos) 256)
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(aref string (1+ pos))))
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(setq pos (+ pos 2))
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(aset block-low idx (+ (* (aref string pos) 256)
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(aref string (1+ pos))))
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(setq pos (+ pos 2))
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(setq idx (1+ idx)))
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;; this is the last (at most) 32bit word.
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(cond
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((= rem 3)
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(aset block-high idx (+ (* (aref string pos) 256)
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(aref string (1+ pos))))
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(setq pos (+ pos 2))
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(aset block-low idx (+ (* (aref string pos) 256)
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128)))
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((= rem 2)
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(aset block-high idx (+ (* (aref string pos) 256)
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(aref string (1+ pos))))
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(aset block-low idx 32768))
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((= rem 1)
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(aset block-high idx (+ (* (aref string pos) 256)
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128))
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(aset block-low idx 0))
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(t ;; (= rem 0)
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(aset block-high idx 32768)
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(aset block-low idx 0)))
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(setq idx (1+ idx))
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(while (< idx 16)
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(aset block-high idx 0)
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(aset block-low idx 0)
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(setq idx (1+ idx))))
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;; last block has enough room to write the length of string.
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(progn
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;; write bit length of string to last 4 bytes of the block.
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(aset block-low 15 (* (% len 8192) 8))
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(setq len (/ len 8192))
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(aset block-high 15 (% len 65536))
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;; XXX: It is not practical to compute SHA1 of
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;; such a huge message on emacs.
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;; (setq len (/ len 65536)) ; for 64bit emacs.
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;; (aset block-low 14 (% len 65536))
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;; (aset block-high 14 (/ len 65536))
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(sha1-block block-high block-low))
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;; need one more block.
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(sha1-block block-high block-low)
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(fillarray block-high 0)
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(fillarray block-low 0)
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;; write bit length of string to last 4 bytes of the block.
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(aset block-low 15 (* (% len 8192) 8))
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(setq len (/ len 8192))
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(aset block-high 15 (% len 65536))
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;; XXX: It is not practical to compute SHA1 of
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;; such a huge message on emacs.
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;; (setq len (/ len 65536)) ; for 64bit emacs.
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;; (aset block-low 14 (% len 65536))
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;; (aset block-high 14 (/ len 65536))
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(sha1-block block-high block-low))
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;; make output string (in binary form).
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(let ((result (make-string 20 0)))
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(aset result 0 (/ sha1-H0-high 256))
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(aset result 1 (% sha1-H0-high 256))
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(aset result 2 (/ sha1-H0-low 256))
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(aset result 3 (% sha1-H0-low 256))
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(aset result 4 (/ sha1-H1-high 256))
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(aset result 5 (% sha1-H1-high 256))
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(aset result 6 (/ sha1-H1-low 256))
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(aset result 7 (% sha1-H1-low 256))
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(aset result 8 (/ sha1-H2-high 256))
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(aset result 9 (% sha1-H2-high 256))
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(aset result 10 (/ sha1-H2-low 256))
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(aset result 11 (% sha1-H2-low 256))
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(aset result 12 (/ sha1-H3-high 256))
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(aset result 13 (% sha1-H3-high 256))
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(aset result 14 (/ sha1-H3-low 256))
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(aset result 15 (% sha1-H3-low 256))
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(aset result 16 (/ sha1-H4-high 256))
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(aset result 17 (% sha1-H4-high 256))
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(aset result 18 (/ sha1-H4-low 256))
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(aset result 19 (% sha1-H4-low 256))
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result))
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;; do not leave a copy of input string.
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(fillarray block-high nil)
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(fillarray block-low nil))))
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(defun sha1-string-internal (string &optional binary)
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(if binary
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(sha1-binary string)
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(encode-hex-string (sha1-binary string))))
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(defun sha1-region-internal (beg end &optional binary)
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(sha1-string-internal (buffer-substring-no-properties beg end) binary))
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;;;
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;;; application interface.
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;;;
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(defun sha1-region (beg end &optional binary)
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(if (and sha1-use-external
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sha1-maximum-internal-length
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(> (abs (- end beg)) sha1-maximum-internal-length))
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(sha1-region-external beg end binary)
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(sha1-region-internal beg end binary)))
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(defun sha1-string (string &optional binary)
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(if (and sha1-use-external
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sha1-maximum-internal-length
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(> (length string) sha1-maximum-internal-length))
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(sha1-string-external string binary)
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(sha1-string-internal string binary)))
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;;;###autoload
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(defun sha1 (object &optional beg end binary)
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"Return the SHA1 (Secure Hash Algorithm) of an object.
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OBJECT is either a string or a buffer.
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Optional arguments BEG and END denote buffer positions for computing the
|
|
hash of a portion of OBJECT.
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If BINARY is non-nil, return a string in binary form."
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(if (stringp object)
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(sha1-string object binary)
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|
(with-current-buffer object
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(sha1-region (or beg (point-min)) (or end (point-max)) binary))))
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(provide 'sha1)
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;;; sha1.el ends here
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