Merge semi21-D20010129.

[elisp/lemi.git] / mail / sha1.el

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+;;; sha1.el --- SHA1 Secure Hash Algorithm.
+
+;; Copyright (C) 1999 Shuhei KOBAYASHI
+
+;; Author: Shuhei KOBAYASHI <shuhei@aqua.ocn.ne.jp>
+;;     Kenichi OKADA <okada@opaopa.org>
+;; Maintainer: Kenichi OKADA <okada@opaopa.org>
+;; 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:
+
+;; Examples from FIPS PUB 180-1.
+;; <URL:http://www.itl.nist.gov/div897/pubs/fip180-1.htm>
+;;
+;; (sha1 "abc")
+;; => a9993e364706816aba3e25717850c26c9cd0d89d
+;;
+;; (sha1 "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq")
+;; => 84983e441c3bd26ebaae4aa1f95129e5e54670f1
+;;
+;; (sha1 (make-string 1000000 ?a))
+;; => 34aa973cd4c4daa4f61eeb2bdbad27316534016f
+
+;;; Code:
+
+(require 'hex-util)
+
+(eval-when-compile
+  (or (fboundp 'sha1-string)
+      (defun sha1-string (a))))
+
+(defvar sha1-dl-module
+  (if (and (fboundp 'sha1-string)
+          (subrp (symbol-function 'sha1-string)))
+      nil
+    (if (fboundp 'dynamic-link)
+       (let ((path (expand-file-name "sha1.so" exec-directory)))
+         (and (file-exists-p path)
+              path)))))
+
+(cond
+ (sha1-dl-module
+  ;; Emacs with DL patch.
+  (require 'sha1-dl))
+ (t
+  (require 'sha1-el)))
+
+;; compatibility for another sha1.el by Keiichi Suzuki.
+(defun sha1-encode (string)
+  (decode-hex-string 
+   (sha1-string string)))
+(defun sha1-encode-binary (string)
+  (decode-hex-string
+   (sha1-string string)))
+
+(make-obsolete 'sha1-encode "It's old API.")
+(make-obsolete 'sha1-encode-binary "It's old API.")
+
+(provide 'sha1)
+
+;;; sha1.el ends here