From: Glenn Morris Date: Wed, 28 Nov 2007 08:06:36 +0000 (+0000) Subject: Move here from ../gnus. X-Git-Tag: emacs-pretest-23.0.90~9275 X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=0cd1fac26800b1588e901b360e314ec938db8981;p=emacs.git Move here from ../gnus. --- diff --git a/lisp/net/hmac-def.el b/lisp/net/hmac-def.el new file mode 100644 index 00000000000..bfff7282adf --- /dev/null +++ b/lisp/net/hmac-def.el @@ -0,0 +1,86 @@ +;;; hmac-def.el --- A macro for defining HMAC functions. + +;; Copyright (C) 1999, 2001, 2007 Free Software Foundation, Inc. + +;; Author: Shuhei KOBAYASHI +;; Keywords: HMAC, RFC 2104 + +;; This file is part of GNU Emacs. + +;; GNU Emacs 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 3, or (at your option) +;; any later version. + +;; GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to the +;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, +;; Boston, MA 02110-1301, USA. + +;;; Commentary: + +;; This program is implemented from RFC 2104, +;; "HMAC: Keyed-Hashing for Message Authentication". + +;;; Code: + +(defmacro define-hmac-function (name H B L &optional bit) + "Define a function NAME(TEXT KEY) which computes HMAC with function H. + +HMAC function is H(KEY XOR opad, H(KEY XOR ipad, TEXT)): + +H is a cryptographic hash function, such as SHA1 and MD5, which takes +a string and return a digest of it (in binary form). +B is a byte-length of a block size of H. (B=64 for both SHA1 and MD5.) +L is a byte-length of hash outputs. (L=16 for MD5, L=20 for SHA1.) +If BIT is non-nil, truncate output to specified bits." + `(defun ,name (text key) + ,(concat "Compute " + (upcase (symbol-name name)) + " over TEXT with KEY.") + (let ((key-xor-ipad (make-string ,B ?\x36)) + (key-xor-opad (make-string ,B ?\x5C)) + (len (length key)) + (pos 0)) + (unwind-protect + (progn + ;; if `key' is longer than the block size, apply hash function + ;; to `key' and use the result as a real `key'. + (if (> len ,B) + (setq key (,H key) + len ,L)) + (while (< pos len) + (aset key-xor-ipad pos (logxor (aref key pos) ?\x36)) + (aset key-xor-opad pos (logxor (aref key pos) ?\x5C)) + (setq pos (1+ pos))) + (setq key-xor-ipad (unwind-protect + (concat key-xor-ipad text) + (fillarray key-xor-ipad 0)) + key-xor-ipad (unwind-protect + (,H key-xor-ipad) + (fillarray key-xor-ipad 0)) + key-xor-opad (unwind-protect + (concat key-xor-opad key-xor-ipad) + (fillarray key-xor-opad 0)) + key-xor-opad (unwind-protect + (,H key-xor-opad) + (fillarray key-xor-opad 0))) + ;; now `key-xor-opad' contains + ;; H(KEY XOR opad, H(KEY XOR ipad, TEXT)). + ,(if (and bit (< (/ bit 8) L)) + `(substring key-xor-opad 0 ,(/ bit 8)) + ;; return a copy of `key-xor-opad'. + `(concat key-xor-opad))) + ;; cleanup. + (fillarray key-xor-ipad 0) + (fillarray key-xor-opad 0))))) + +(provide 'hmac-def) + +;;; arch-tag: 645adcef-b835-4900-a10a-11f636c982b9 +;;; hmac-def.el ends here diff --git a/lisp/net/hmac-md5.el b/lisp/net/hmac-md5.el new file mode 100644 index 00000000000..186708446f0 --- /dev/null +++ b/lisp/net/hmac-md5.el @@ -0,0 +1,85 @@ +;;; hmac-md5.el --- Compute HMAC-MD5. + +;; Copyright (C) 1999, 2001, 2007 Free Software Foundation, Inc. + +;; Author: Shuhei KOBAYASHI +;; Keywords: HMAC, RFC 2104, HMAC-MD5, MD5, KEYED-MD5, CRAM-MD5 + +;; This file is part of GNU Emacs. + +;; GNU Emacs 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 3, or (at your option) +;; any later version. + +;; GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to the +;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, +;; Boston, MA 02110-1301, USA. + +;;; Commentary: + +;; Test cases from RFC 2202, "Test Cases for HMAC-MD5 and HMAC-SHA-1". +;; +;; (encode-hex-string (hmac-md5 "Hi There" (make-string 16 ?\x0b))) +;; => "9294727a3638bb1c13f48ef8158bfc9d" +;; +;; (encode-hex-string (hmac-md5 "what do ya want for nothing?" "Jefe")) +;; => "750c783e6ab0b503eaa86e310a5db738" +;; +;; (encode-hex-string (hmac-md5 (make-string 50 ?\xdd) (make-string 16 ?\xaa))) +;; => "56be34521d144c88dbb8c733f0e8b3f6" +;; +;; (encode-hex-string +;; (hmac-md5 +;; (make-string 50 ?\xcd) +;; (decode-hex-string "0102030405060708090a0b0c0d0e0f10111213141516171819"))) +;; => "697eaf0aca3a3aea3a75164746ffaa79" +;; +;; (encode-hex-string +;; (hmac-md5 "Test With Truncation" (make-string 16 ?\x0c))) +;; => "56461ef2342edc00f9bab995690efd4c" +;; +;; (encode-hex-string +;; (hmac-md5-96 "Test With Truncation" (make-string 16 ?\x0c))) +;; => "56461ef2342edc00f9bab995" +;; +;; (encode-hex-string +;; (hmac-md5 +;; "Test Using Larger Than Block-Size Key - Hash Key First" +;; (make-string 80 ?\xaa))) +;; => "6b1ab7fe4bd7bf8f0b62e6ce61b9d0cd" +;; +;; (encode-hex-string +;; (hmac-md5 +;; "Test Using Larger Than Block-Size Key and Larger Than One Block-Size Data" +;; (make-string 80 ?\xaa))) +;; => "6f630fad67cda0ee1fb1f562db3aa53e" + +;;; Code: + +(eval-when-compile (require 'hmac-def)) +(require 'hex-util) ; (decode-hex-string STRING) +(require 'md5) ; expects (md5 STRING) + +(defun md5-binary (string) + "Return the MD5 of STRING in binary form." + (if (condition-case nil + ;; `md5' of v21 takes 4th arg CODING (and 5th arg NOERROR). + (md5 "" nil nil 'binary) ; => "d41d8cd98f00b204e9800998ecf8427e" + (wrong-number-of-arguments nil)) + (decode-hex-string (md5 string nil nil 'binary)) + (decode-hex-string (md5 string)))) + +(define-hmac-function hmac-md5 md5-binary 64 16) ; => (hmac-md5 TEXT KEY) +(define-hmac-function hmac-md5-96 md5-binary 64 16 96) + +(provide 'hmac-md5) + +;;; arch-tag: 0ab3f4f6-3d4b-4167-a9fa-635b7fed7f27 +;;; hmac-md5.el ends here