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81 lines
3.0 KiB
EmacsLisp
81 lines
3.0 KiB
EmacsLisp
;;; md5.el --- MD5 message digest calculation (RFC 1321)
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;; Copyright (C) 2000 Free Software Foundation, Inc.
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;; Author: Dave Love <fx@gnu.org>
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;; Keywords: mail, processes, tools
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;; This file 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 2, or (at your option)
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;; any later version.
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;; This file 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; see the file COPYING. If not, write to
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;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; Provides the `md5' function for computing the MD5 `message
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;; digest'/`fingerprint'/`checksum' for a string or buffer. This is
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;; compatible with the XEmacs version. We expect to have primitive
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;; MD5 support in a future version of Emacs.
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;; MD5 is defined in RFC 1321.
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;;; Code:
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;; Not worth customizing? Will go away anyhow with primitive support.
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(defvar md5-program "md5sum"
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"Name of a program to calculate MD5 (message digest) checksums.
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This should read standard input and output the MD5 checksum in the
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first 32 bytes of standard output. `md5sum' is in GNU Textutils. An
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alternative is `md5', present in the SSLeay distribution.")
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;;;###autoload
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(defun md5 (object &optional start end encoding noerror)
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"Return the MD5 message digest (checksum or fingerprint) of OBJECT.
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OBJECT is a buffer or a atring. Optional arguments START and END
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specify a region of the object to use, where the first character is 1
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for both buffers and strings.
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Optional argument ENCODING specifies a coding system with which to
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encode the text for computing the digest. If omitted, the normal
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rules will be used to find a coding system for output to
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`md5-program'. It probably makes most sense to use unibyte data and
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`binary' encoding. Optional argument NOERROR is for XEmacs
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compatibility and is ignored.
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In this implementation, the program named by `md5-program' is run to
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do the calculation.
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MD5 is defined in RFC 1321."
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(with-temp-buffer
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(let ((in-buffer (current-buffer))
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(out-buffer (current-buffer)))
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(if (stringp object)
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(insert object)
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(setq in-buffer object))
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(goto-char (point-min))
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(unless encoding
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(setq encoding coding-system-for-write))
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(with-current-buffer in-buffer
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(let ((coding-system-for-write encoding))
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(unless (eq 0 (call-process-region (or start (point-min))
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(or end (point-max))
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md5-program nil out-buffer))
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(error "Running `md5-program' failed"))))
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;; The meaningful output is the first 32 characters.
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;; Don't return the newline that follows them!
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(buffer-substring 1 33))))
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(provide 'md5)
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;;; md5.el ends here
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