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|
#|
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 of the License, 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; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301, USA.
**** md5sum ********************************************************************
Copyright Volker van Nek, 2013 - 2015
md5sum returns the md5 checksum of a string, a non-negative integer or
a list of octets.
The default return value is a string that guarantees 32 hex characters.
An optional argument allows md5sum to return the corresponding number or
list of octets.
(%i1) ibase: obase: 16.$
(%i2) msg: "foo bar baz"$
(%i3) string: md5sum(msg);
(%o3) ab07acbb1e496801937adfa772424bf7
(%i4) integer: md5sum(msg, 'number);
(%o4) 0ab07acbb1e496801937adfa772424bf7
(%i5) octets: md5sum(msg, 'list);
(%o5) [0AB,7,0AC,0BB,1E,49,68,1,93,7A,0DF,0A7,72,42,4B,0F7]
(%i6) sdowncase( printf(false, "~{~2,'0x~^:~}", octets) );
(%o6) ab:07:ac:bb:1e:49:68:01:93:7a:df:a7:72:42:4b:f7
Note that in case the string contains German umlauts or other non-ASCII
characters the md5 checksum is platform dependent.
To check the md5sum of a *small* file the file can be streamed into a string.
(%i1) ostream : make_string_output_stream();
(%o1) #<string-output stream 00f06ae8>
(%i2) fos : openr("/home/volker/pub_key_temp.pem");
(%o2) #<input stream /home/volker/pub_key_temp.pem>
(%i3) while (c : readchar(fos)) # false do printf(ostream, "~a", c);
(%o3) done
(%i4) close(fos);
(%o4) true
(%i5) string : get_output_stream_string(ostream);
(%o5) -----BEGIN PUBLIC KEY-----
MIIBCgKCAQEA7CCxZOFAoZ7khi0TiwIxU8cHEZJnIQb96ONrPbSqq/s3CVwU1eLH
9QEaZb8viFhe6/Db66DjR6RqCO3uIfx2siAb8SaTo0PYZz8JQ5IenjBDJAGA56gE
6OX8JadgPCLEZTdJ2Q0axqPHwoWsZkn56Pt4UlJfUcW7cNPNIihgy2DwE1PpbHCY
IdhYcT/iYA6C+TiYdYNcAFUsQyGExBxOTOXrMGFknjALedkLoq9IN3Djnw4kxGYv
vl3hVYBJpixusUgOK5LhYwowQayeczPoMA0Ef5KAZwJY9lUZ2UYBKMqdoNpdJuDz
q4QOxlkqUvZxWTEHqNmlfX4/2w71ZiAqpwIDAQAB
-----END PUBLIC KEY-----
(%i6) close(ostream);
(%o6) true
(%i7) md5sum(string);
(%o7) b5f2033ccb6f4066874aa5a2308bd561
The result is checked against openssl in GNU/Linux.
(%i8) system("openssl dgst -md5 '/home/volker/pub_key_temp.pem' > temp ; cat temp");
MD5(/home/volker/pub_key_temp.pem)= b5f2033ccb6f4066874aa5a2308bd561
(%o8) 0
|#
(in-package :maxima)
(eval-when
(:compile-toplevel :execute)
(defvar old-ibase-md5 *read-base*)
(setq *read-base* 10.) )
(defvar *h5* nil)
(defvar *w5* nil)
(defvar *k5* (make-array 64. :element-type 'integer :initial-element 0))
(do ((i 0 (1+ i)))
((= i 64.))
(setf (svref *k5* i) (floor (* (abs (sin (+ i 1.0))) #x100000000))) )
(defvar *s5*
#( 7. 12. 17. 22. 7. 12. 17. 22. 7. 12. 17. 22. 7. 12. 17. 22.
5. 9. 14. 20. 5. 9. 14. 20. 5. 9. 14. 20. 5. 9. 14. 20.
4. 11. 16. 23. 4. 11. 16. 23. 4. 11. 16. 23. 4. 11. 16. 23.
6. 10. 15. 21. 6. 10. 15. 21. 6. 10. 15. 21. 6. 10. 15. 21. ))
(declaim (inline md5-not md5+ md5-left-rotation))
(defun md5-not (i32)
(logand (lognot i32) #xffffffff) )
(defun md5+ (&rest args)
(logand (apply #'+ args) #xffffffff) )
(defun md5-left-rotation (i32 k)
(logior (logand (ash i32 k) #xffffffff) (ash i32 (- k 32.))) )
(defun md5-worker ()
(multiple-value-bind (a b c d) (apply #'values *h5*)
(let (f g tmp hlp)
(do ((i 0 (1+ i)))
((= i 64.))
(cond
((< i 16.)
(setq f (logior (logand b c) (logand (md5-not b) d))
g i ))
((< i 32.)
(setq f (logior (logand b d) (logand c (md5-not d)))
g (logand (+ (* 5 i) 1) #xf) ))
((< i 48.)
(setq f (logxor b c d)
g (logand (+ (* 3 i) 5) #xf) ))
(t
(setq f (logxor c (logior b (md5-not d)))
g (logand (* 7 i) #xf) )))
(setq tmp d
d c
c b
hlp (md5+ a f (svref *k5* i) (svref *w5* g))
hlp (md5-left-rotation hlp (svref *s5* i))
b (md5+ b hlp)
a tmp ))
(setq *h5* (mapcar #'md5+ (list a b c d) *h5*)) )))
(defun swap-endian64 (i64) ;; little-endian <--> big-endian
(do ((masq #xff (ash masq 8))
(sh 0 (- sh 8)) w )
((= sh -64.) (nreverse w))
(push (ash (logand i64 masq) sh) w) ))
(defun swap-endian32 (i32)
(logior (ash (logand i32 #xff) 24.)
(ash (logand i32 #xff00) 8.)
(ash (logand i32 #xff0000) -8.)
(ash (logand i32 #xff000000) -24.) ))
(defun md5-words (vec) ;; 32 bit little-endian
(let ((w (make-array 16. :element-type 'integer :initial-element 0))
(inc -1) )
(do ((i 0 (1+ i)))
((= i 16.) w)
(setf (svref w i)
(logior (svref vec (incf inc))
(ash (svref vec (incf inc)) 8.)
(ash (svref vec (incf inc)) 16.)
(ash (svref vec (incf inc)) 24.) )))))
(defun md5-update (bytes)
(setq *w5* (md5-words (coerce bytes 'vector)))
(md5-worker) )
(defun md5-final (bytes off len)
(when bytes (setq bytes (append bytes '(#x80)))) ;; don't modify bytes
(when (= 0 off) (setq bytes '(#x80)))
(if (<= off 55.)
(let* ((bits (ash len 3))
(len64 (swap-endian64 bits))
(pad (make-list (- 55. off) :initial-element 0)) )
(md5-update (append bytes pad len64)) )
(let ((pad (make-list (- 63. off) :initial-element 0)))
(md5-update (append bytes pad))
(md5-final nil -1 len) )))
(defmfun $md5sum (s &optional (rtype '$string))
(let (bytes len)
(cond
((stringp s)
(setq bytes (string-to-octets s)) )
((and (integerp s) (>= s 0))
(setq bytes (number-to-octets s)) )
(($listp s)
(setq bytes (cdr s)) )
((streamp s)
(return-from md5sum-impl (md5sum-stream s rtype)))
(t
(gf-merror (intl:gettext
"`md5sum': Argument must be a string, non-negative integer, list of octets, or stream." ))))
(setq len (length bytes)
*h5* '(#x67452301 #xefcdab89 #x98badcfe #x10325476) )
(do ((off len))
((< off 64.) (md5-final bytes off len))
(setq off (- off 64.))
(md5-update (butlast bytes off))
(setq bytes (last bytes off)) )
(setq *h5* (mapcar #'swap-endian32 *h5*))
(md5sum-return rtype)))
(defun md5sum-return (rtype)
(cond
((equal rtype '$list)
(cons '(mlist simp)
(reduce #'nconc (mapcar #'word-to-octets *h5*)) ))
((equal rtype '$number)
(reduce #'(lambda (x y) (logior (ash x 32.) y)) *h5*) )
((equal rtype '$string)
(nstring-downcase (format nil "~{~8,'0x~}" *h5*)) )
(t
(gf-merror (intl:gettext
"`md5sum': Optional argument must be 'list, 'number or 'string." )))))
(defun md5sum-stream (s rtype)
(setq *h5* '(#x67452301 #xefcdab89 #x98badcfe #x10325476))
(let ((bytes (make-list 64.)) (len 0))
(do
((len-1 (read-sequence bytes s)))
((< len-1 64.) (md5-final (butlast bytes (- (length bytes) len-1)) len-1 (+ len len-1)))
(md5-update bytes)
(setq len (+ len len-1))
(setq len-1 (read-sequence bytes s))))
(setq *h5* (mapcar #'swap-endian32 *h5*))
(md5sum-return rtype))
(eval-when
(:compile-toplevel :execute)
(setq *read-base* old-ibase-md5) )
|
