+++ /dev/null
-;;; canlock.el --- Functions for Cancel-Lock feature
-;; Copyright (C) 1998, 1999, 2001 Free Software Foundation, Inc.
-
-;; Author: Katsumi Yamaoka <yamaoka@jpl.org>
-;; Keywords: news, cancel-lock, hmac, sha1, rfc2104
-
-;; 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:
-
-;; Canlock is a library for generating and verifying Cancel-Lock and/or
-;; Cancel-Key header in news articles. This is used to protect articles
-;; from rogue cancel, supersede or replace attacks. The method is based
-;; on draft-ietf-usefor-cancel-lock-01.txt which was released on November
-;; 3rd 1998. For instance, you can add Cancel-Lock (and possibly Cancel-
-;; Key) header in a news article by using a hook which will be evaluated
-;; just before sending an article as follows:
-;;
-;; (add-hook '*e**a*e-header-hook 'canlock-insert-header t)
-;;
-;; Verifying Cancel-Lock is mainly a function of news servers, however,
-;; you can verify your own article using the command `canlock-verify' in
-;; the (raw) article buffer. You will be prompted for the password for
-;; each time if the option `canlock-password' or `canlock-password-for-
-;; verify' is nil. Note that setting these options is a bit unsafe.
-
-;;; Code:
-
-(defconst canlock-version "0.8")
-
-(eval-when-compile
- (require 'cl))
-
-(autoload 'sha1-binary "sha1-el")
-(autoload 'sha1-encode-binary "sha1")
-(autoload 'base64-encode "base64")
-
-(defgroup canlock nil
- "The Cancel-Lock feature."
- :group 'applications)
-
-(defcustom canlock-sha1-function 'sha1-binary
- "Function to call to make a SHA-1 message digest."
- :type '(radio (function-item sha1-encode-binary)
- (function-item sha1-binary)
- (function-item canlock-sha1-with-openssl)
- (function :tag "Other"))
- :group 'canlock)
-
-(defcustom canlock-sha1-function-for-verify canlock-sha1-function
- "Function to call to make a SHA-1 message digest for verifying."
- :type '(radio (function-item sha1-encode-binary)
- (function-item sha1-binary)
- (function-item canlock-sha1-with-openssl)
- (function :tag "Other"))
- :group 'canlock)
-
-(defcustom canlock-openssl-program "openssl"
- "Name of OpenSSL program."
- :type 'string
- :group 'canlock)
-
-(defcustom canlock-openssl-args '("sha1")
- "Arguments passed to the OpenSSL program."
- :type 'sexp
- :group 'canlock)
-
-(defcustom canlock-ignore-errors nil
- "If non-nil, ignore any error signals."
- :type 'boolean
- :group 'canlock)
-
-(defcustom canlock-password nil
- "Password to use when signing a Cancel-Lock or a Cancel-Key header."
- :type 'string
- :group 'canlock)
-
-(defcustom canlock-password-for-verify canlock-password
- "Password to use when verifying a Cancel-Lock or a Cancel-Key header."
- :type 'string
- :group 'canlock)
-
-(defcustom canlock-force-insert-header nil
- "If non-nil, insert a Cancel-Lock or a Cancel-Key header even if the
-buffer does not look like a news message."
- :type 'boolean
- :group 'canlock)
-
-(defun canlock-sha1-with-openssl (message)
- "Make a SHA-1 digest of MESSAGE using OpenSSL."
- (with-temp-buffer
- (let ((coding-system-for-read 'binary)
- (coding-system-for-write 'binary)
- selective-display
- (case-fold-search t))
- (insert message)
- (apply 'call-process-region (point-min) (point-max)
- canlock-openssl-program t t nil canlock-openssl-args)
- (goto-char (point-min))
- (while (re-search-forward "[0-9a-f][0-9a-f]" nil t)
- (replace-match (read (concat "\"\\x" (match-string 0) "\""))))
- (buffer-substring (point-min) (point)))))
-
-(defvar canlock-read-passwd nil)
-(defun canlock-read-passwd (prompt &rest args)
- "Read a password using PROMPT.
-If ARGS, PROMPT is used as an argument to `format'."
- (let ((prompt
- (if args
- (apply 'format prompt args)
- prompt)))
- (unless canlock-read-passwd
- (if (or (fboundp 'read-passwd) (load "passwd" t))
- (setq canlock-read-passwd 'read-passwd)
- (unless (fboundp 'ange-ftp-read-passwd)
- (autoload 'ange-ftp-read-passwd "ange-ftp"))
- (setq canlock-read-passwd 'ange-ftp-read-passwd)))
- (funcall canlock-read-passwd prompt)))
-
-(defun canlock-make-cancel-key (message-id password)
- "Make a Cancel-Key header."
- (cond ((> (length password) 20)
- (setq password (funcall canlock-sha1-function password)))
- ((< (length password) 20)
- (setq password (concat
- password
- (make-string (- 20 (length password)) 0)))))
- (setq password (concat password (make-string 44 0)))
- (let ((ipad (mapconcat (lambda (char)
- (char-to-string (logxor 54 char)))
- password ""))
- (opad (mapconcat (lambda (char)
- (char-to-string (logxor 92 char)))
- password "")))
- (base64-encode-string (funcall canlock-sha1-function
- (concat
- opad
- (funcall canlock-sha1-function
- (concat ipad message-id)))))))
-
-(defun canlock-narrow-to-header ()
- "Narrow the buffer to the head of the message."
- (let (case-fold-search)
- (narrow-to-region
- (goto-char (point-min))
- (goto-char (if (re-search-forward
- (format "^$\\|^%s$"
- (regexp-quote mail-header-separator))
- nil t)
- (match-beginning 0)
- (point-max))))))
-
-(defun canlock-delete-headers ()
- "Delete Cancel-Key or Cancel-Lock headers in the narrowed buffer."
- (let ((case-fold-search t))
- (goto-char (point-min))
- (while (re-search-forward "^Cancel-\\(Key\\|Lock\\):" nil t)
- (delete-region (match-beginning 0)
- (if (re-search-forward "^[^\t ]" nil t)
- (goto-char (match-beginning 0))
- (point-max))))))
-
-(defun canlock-fetch-fields (&optional key)
- "Return a list of the values of Cancel-Lock header.
-If KEY is non-nil, look for a Cancel-Key header instead. The buffer
-is expected to be narrowed to just the headers of the message."
- (let ((field (mail-fetch-field (if key "Cancel-Key" "Cancel-Lock")))
- fields rest
- (case-fold-search t))
- (when field
- (setq fields (split-string field "[\t\n\r ,]+"))
- (while fields
- (when (string-match "^sha1:" (setq field (pop fields)))
- (push (substring field 5) rest)))
- (nreverse rest))))
-
-(defun canlock-fetch-id-for-key ()
- "Return a Message-ID in Cancel, Supersedes or Replaces header.
-The buffer is expected to be narrowed to just the headers of the
-message."
- (or (let ((cancel (mail-fetch-field "Control")))
- (and cancel
- (string-match "^cancel[\t ]+\\(<[^\t\n @<>]+@[^\t\n @<>]+>\\)"
- cancel)
- (match-string 1 cancel)))
- (mail-fetch-field "Supersedes")
- (mail-fetch-field "Replaces")))
-
-;;;###autoload
-(defun canlock-insert-header (&optional id-for-key id-for-lock password)
- "Insert a Cancel-Key and/or a Cancel-Lock header if possible."
- (let (news control key-for-key key-for-lock)
- (save-excursion
- (save-restriction
- (canlock-narrow-to-header)
- (when (setq news (or canlock-force-insert-header
- (mail-fetch-field "Newsgroups")))
- (unless id-for-key
- (setq id-for-key (canlock-fetch-id-for-key)))
- (if (and (setq control (mail-fetch-field "Control"))
- (string-match
- "^cancel[\t ]+\\(<[^\t\n @<>]+@[^\t\n @<>]+>\\)"
- control))
- (setq id-for-lock nil)
- (unless id-for-lock
- (setq id-for-lock (mail-fetch-field "Message-ID"))))
- (canlock-delete-headers)
- (goto-char (point-max))))
- (when news
- (if (not (or id-for-key id-for-lock))
- (message "There are no Message-ID(s)")
- (unless password
- (setq password (or canlock-password
- (canlock-read-passwd
- "Password for Canlock: "))))
- (if (or (not (stringp password)) (zerop (length password)))
- (message "Password for Canlock is bad")
- (setq key-for-key (when id-for-key
- (canlock-make-cancel-key
- id-for-key password))
- key-for-lock (when id-for-lock
- (canlock-make-cancel-key
- id-for-lock password)))
- (if (not (or key-for-key key-for-lock))
- (message "Couldn't insert Canlock header")
- (when key-for-key
- (insert "Cancel-Key: sha1:" key-for-key "\n"))
- (when key-for-lock
- (insert "Cancel-Lock: sha1:"
- (base64-encode-string (funcall canlock-sha1-function
- key-for-lock))
- "\n")))))))))
-
-;;;###autoload
-(defun canlock-verify (&optional buffer)
- "Verify Cancel-Lock or Cancel-Key in BUFFER.
-If BUFFER is nil, the current buffer is assumed. Signal an error if
-it fails. You can modify the behavior of this function to return non-
-nil instead of to signal an error by setting the option
-`canlock-ignore-errors' to non-nil."
- (interactive)
- (let ((canlock-sha1-function (or canlock-sha1-function-for-verify
- canlock-sha1-function))
- keys locks errmsg id-for-key id-for-lock password
- key-for-key key-for-lock match)
- (save-excursion
- (when buffer
- (set-buffer buffer))
- (save-restriction
- (widen)
- (canlock-narrow-to-header)
- (setq keys (canlock-fetch-fields 'key)
- locks (canlock-fetch-fields))
- (if (not (or keys locks))
- (setq errmsg
- "There are neither Cancel-Lock nor Cancel-Key headers")
- (setq id-for-key (canlock-fetch-id-for-key)
- id-for-lock (mail-fetch-field "Message-ID"))
- (or id-for-key id-for-lock
- (setq errmsg "There are no Message-ID(s)")))))
-
- (if errmsg
- (if canlock-ignore-errors
- errmsg
- (error "%s" errmsg))
-
- (setq password (or canlock-password-for-verify
- (canlock-read-passwd "Password for Canlock: ")))
- (if (or (not (stringp password)) (zerop (length password)))
- (progn
- (setq errmsg "Password for Canlock is bad")
- (if canlock-ignore-errors
- errmsg
- (error "%s" errmsg)))
-
- (when keys
- (when id-for-key
- (setq key-for-key (canlock-make-cancel-key id-for-key password))
- (while (and keys (not match))
- (setq match (string-equal key-for-key (pop keys)))))
- (setq keys (if match "good" "bad")))
- (setq match nil)
-
- (when locks
- (when id-for-lock
- (setq key-for-lock
- (base64-encode-string (funcall canlock-sha1-function
- (canlock-make-cancel-key
- id-for-lock password))))
- (when (and locks (not match))
- (setq match (string-equal key-for-lock (pop locks)))))
- (setq locks (if match "good" "bad")))
-
- (prog1
- (when (member "bad" (list keys locks))
- "bad")
- (cond ((and keys locks)
- (message "Cancel-Key is %s, Cancel-Lock is %s" keys locks))
- (locks
- (message "Cancel-Lock is %s" locks))
- (keys
- (message "Cancel-Key is %s" keys))))))))
-
-(provide 'canlock)
-
-;;; canlock.el ends here
+++ /dev/null
-;;; sha1-el.el --- SHA1 Secure Hash Algorithm in Emacs-Lisp.
-
-;; Copyright (C) 1999, 2001 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.
-;;;
-
-(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-el)
-
-;;; sha1-el.el ends here
projects / gnus / commitdiff