Home » Personal collection » Acorn tapes » Electron_User » Electron_User_tape25a_acorn_eu_1991_july.wav » DES

DES

This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.

Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.

Tape/disk: Home » Personal collection » Acorn tapes » Electron_User » Electron_User_tape25a_acorn_eu_1991_july.wav
Filename: DES
Read OK: ✔
File size: 04D4 bytes
Load address: FFFF1A00
Exec address: FFFF8023
Duplicates

There are 3 duplicate copies of this file in the archive:

File contents
   10REM Data Encryption Standard
   20REM FILE ENCRYPTION
   30REM By C.Dunkley 1990/91
   40MODE7
   50*KEY0 PAGE=&2300|M*LOAD DES_MC|MCH."DES"|M
   60IFPAGE=&2300 THEN100
   70*FX138 0 128
   80STOP
   90:
  100des%=&20E2:key%=&20C9:text%=&20D2:ddes%=&20DB
  110*FX200 1
  120:
  130REPEAT
  140CLS
  150PRINTSPC(8);"DATA ENCRYPTION STANDARD"
  160PRINT'SPC(8);"By C.Dunkley  (Dec 1990)"
  170PRINT'STRING$(40,"-");
  180PRINT
  190key$=""
  200FORN%=1TO8
  210INPUT"File name : ",in$
  220INPUTTAB(0,7);"Key       : ",key$
  230PRINTTAB(0,7);SPC(40);
  240IFLENkey$>8 THEN220 
  250PRINTTAB(0,7);"Cipher or Decipher : ";
  260REPEAT
  270A$=CHR$(GET OR32)
  280UNTILA$="c"ORA$="d"
  290PRINT;A$;
  300PRINT'
  310IFLENkey$<8 FORloop%=LENkey$TO7:key$=key$+CHR$0:NEXT
  320F%=OPENUP(in$)
  330S%=EXT#(F%)
  340N%=S%DIV8
  350IFN%<>S%/8 THEN PROCmessage
  360$key%=key$
  370O%=0
  380PRINTTAB(0,12);"Iterations left : ";
  390FORloop%=1 TO N%
  400PTR#F%=O%
  410text$=""
  420FORloop1%=0TO7
  430  text$=text$+CHR$(BGET#(F%))
  440NEXT
  450$text%=text$
  460IFA$="c" CALLdes% ELSE CALLddes%
  470PTR#F%=O%
  480FORloop1%=0TO7
  490  BPUT#F%,?(text%+loop1%)
  500NEXT
  510PRINTTAB(18,12);N%-loop%;" ";
  520O%=O%+8
  530NEXT
  540CLOSE#F%
  550PRINT''"Finished"
  560PRINT'STRING$(40,"-")
  570PRINT"Another file (Y/N)?";
  580REPEAT
  590A$=CHR$(GET OR32)
  600UNTILA$="y"ORA$="n"
  610UNTILA$="n"
  620CLS
  630END
  640REM *****************************************
  650:
  660DEFPROCmessage
  670PRINT"The file size is not divisable by 8,"
  680A%=S%-8*(S%DIV8)
  690PRINT"the last ";A%;" byte(s) will not be altered."
  700ENDPROC


� Data Encryption Standard
� FILE ENCRYPTION
� By C.Dunkley 1990/91
(�7
2.*KEY0 PAGE=&2300|M*LOAD DES_MC|MCH."DES"|M
<�=&2300 ��Dd@
F*FX138 0 128
P�
Z:
d1des%=&20E2:key%=&20C9:text%=&20D2:ddes%=&20DB
n*FX200 1
x:
��
��
�$�(8);"DATA ENCRYPTION STANDARD"
�%�'�(8);"By C.Dunkley  (Dec 1990)"
��'�40,"-");
��
�key$=""
��N%=1�8
��"File name : ",in$
��0,7);"Key       : ",key$
��0,7);�(40);
��key$>8 ��d\@ 
�#�0,7);"Cipher or Decipher : ";
�
A$=�(� �32)
�A$="c"�A$="d"
"	�;A$;
,�'
6*�key$<8 �loop%=�key$�7:key$=key$+�0:�
@
F%=�(in$)
J
S%=�#(F%)
TN%=S%�8
^�N%<>S%/8 � �message
h$key%=key$
rO%=0
|!�0,12);"Iterations left : ";
��loop%=1 � N%
��#F%=O%
�text$=""
��loop1%=0�7
�  text$=text$+�(�#(F%))
��
�$text%=text$
��A$="c" �des% � �ddes%
��#F%=O%
��loop1%=0�7
�  �#F%,?(text%+loop1%)
��
��18,12);N%-loop%;" ";
O%=O%+8
�
�#F%
&�''"Finished"
0�'�40,"-")
:�"Another file (Y/N)?";
D�
NA$=�(� �32)
X�A$="y"�A$="n"
b�A$="n"
l�
v�
�/� *****************************************
�:
�
��message
�+�"The file size is not divisable by 8,"
�A%=S%-8*(S%�8)
�3�"the last ";A%;" byte(s) will not be altered."
��
�
00000000  0d 00 0a 1e f4 20 44 61  74 61 20 45 6e 63 72 79  |..... Data Encry|
00000010  70 74 69 6f 6e 20 53 74  61 6e 64 61 72 64 0d 00  |ption Standard..|
00000020  14 15 f4 20 46 49 4c 45  20 45 4e 43 52 59 50 54  |... FILE ENCRYPT|
00000030  49 4f 4e 0d 00 1e 1a f4  20 42 79 20 43 2e 44 75  |ION..... By C.Du|
00000040  6e 6b 6c 65 79 20 31 39  39 30 2f 39 31 0d 00 28  |nkley 1990/91..(|
00000050  06 eb 37 0d 00 32 2e 2a  4b 45 59 30 20 50 41 47  |..7..2.*KEY0 PAG|
00000060  45 3d 26 32 33 30 30 7c  4d 2a 4c 4f 41 44 20 44  |E=&2300|M*LOAD D|
00000070  45 53 5f 4d 43 7c 4d 43  48 2e 22 44 45 53 22 7c  |ES_MC|MCH."DES"||
00000080  4d 0d 00 3c 12 e7 90 3d  26 32 33 30 30 20 8c 8d  |M..<...=&2300 ..|
00000090  44 64 40 0d 00 46 10 2a  46 58 31 33 38 20 30 20  |Dd@..F.*FX138 0 |
000000a0  31 32 38 0d 00 50 05 fa  0d 00 5a 05 3a 0d 00 64  |128..P....Z.:..d|
000000b0  31 64 65 73 25 3d 26 32  30 45 32 3a 6b 65 79 25  |1des%=&20E2:key%|
000000c0  3d 26 32 30 43 39 3a 74  65 78 74 25 3d 26 32 30  |=&20C9:text%=&20|
000000d0  44 32 3a 64 64 65 73 25  3d 26 32 30 44 42 0d 00  |D2:ddes%=&20DB..|
000000e0  6e 0c 2a 46 58 32 30 30  20 31 0d 00 78 05 3a 0d  |n.*FX200 1..x.:.|
000000f0  00 82 05 f5 0d 00 8c 05  db 0d 00 96 24 f1 89 28  |............$..(|
00000100  38 29 3b 22 44 41 54 41  20 45 4e 43 52 59 50 54  |8);"DATA ENCRYPT|
00000110  49 4f 4e 20 53 54 41 4e  44 41 52 44 22 0d 00 a0  |ION STANDARD"...|
00000120  25 f1 27 89 28 38 29 3b  22 42 79 20 43 2e 44 75  |%.'.(8);"By C.Du|
00000130  6e 6b 6c 65 79 20 20 28  44 65 63 20 31 39 39 30  |nkley  (Dec 1990|
00000140  29 22 0d 00 aa 0f f1 27  c4 34 30 2c 22 2d 22 29  |)".....'.40,"-")|
00000150  3b 0d 00 b4 05 f1 0d 00  be 0b 6b 65 79 24 3d 22  |;.........key$="|
00000160  22 0d 00 c8 0b e3 4e 25  3d 31 b8 38 0d 00 d2 17  |".....N%=1.8....|
00000170  e8 22 46 69 6c 65 20 6e  61 6d 65 20 3a 20 22 2c  |."File name : ",|
00000180  69 6e 24 0d 00 dc 1e e8  8a 30 2c 37 29 3b 22 4b  |in$......0,7);"K|
00000190  65 79 20 20 20 20 20 20  20 3a 20 22 2c 6b 65 79  |ey       : ",key|
000001a0  24 0d 00 e6 11 f1 8a 30  2c 37 29 3b 89 28 34 30  |$......0,7);.(40|
000001b0  29 3b 0d 00 f0 13 e7 a9  6b 65 79 24 3e 38 20 8c  |);......key$>8 .|
000001c0  8d 64 5c 40 20 0d 00 fa  23 f1 8a 30 2c 37 29 3b  |.d\@ ...#..0,7);|
000001d0  22 43 69 70 68 65 72 20  6f 72 20 44 65 63 69 70  |"Cipher or Decip|
000001e0  68 65 72 20 3a 20 22 3b  0d 01 04 05 f5 0d 01 0e  |her : ";........|
000001f0  0f 41 24 3d bd 28 a5 20  84 33 32 29 0d 01 18 12  |.A$=.(. .32)....|
00000200  fd 41 24 3d 22 63 22 84  41 24 3d 22 64 22 0d 01  |.A$="c".A$="d"..|
00000210  22 09 f1 3b 41 24 3b 0d  01 2c 06 f1 27 0d 01 36  |"..;A$;..,..'..6|
00000220  2a e7 a9 6b 65 79 24 3c  38 20 e3 6c 6f 6f 70 25  |*..key$<8 .loop%|
00000230  3d a9 6b 65 79 24 b8 37  3a 6b 65 79 24 3d 6b 65  |=.key$.7:key$=ke|
00000240  79 24 2b bd 30 3a ed 0d  01 40 0d 46 25 3d ad 28  |y$+.0:...@.F%=.(|
00000250  69 6e 24 29 0d 01 4a 0d  53 25 3d a2 23 28 46 25  |in$)..J.S%=.#(F%|
00000260  29 0d 01 54 0b 4e 25 3d  53 25 81 38 0d 01 5e 18  |)..T.N%=S%.8..^.|
00000270  e7 4e 25 3c 3e 53 25 2f  38 20 8c 20 f2 6d 65 73  |.N%<>S%/8 . .mes|
00000280  73 61 67 65 0d 01 68 0e  24 6b 65 79 25 3d 6b 65  |sage..h.$key%=ke|
00000290  79 24 0d 01 72 08 4f 25  3d 30 0d 01 7c 21 f1 8a  |y$..r.O%=0..|!..|
000002a0  30 2c 31 32 29 3b 22 49  74 65 72 61 74 69 6f 6e  |0,12);"Iteration|
000002b0  73 20 6c 65 66 74 20 3a  20 22 3b 0d 01 86 11 e3  |s left : ";.....|
000002c0  6c 6f 6f 70 25 3d 31 20  b8 20 4e 25 0d 01 90 0b  |loop%=1 . N%....|
000002d0  cf 23 46 25 3d 4f 25 0d  01 9a 0c 74 65 78 74 24  |.#F%=O%....text$|
000002e0  3d 22 22 0d 01 a4 0f e3  6c 6f 6f 70 31 25 3d 30  |="".....loop1%=0|
000002f0  b8 37 0d 01 ae 1b 20 20  74 65 78 74 24 3d 74 65  |.7....  text$=te|
00000300  78 74 24 2b bd 28 9a 23  28 46 25 29 29 0d 01 b8  |xt$+.(.#(F%))...|
00000310  05 ed 0d 01 c2 10 24 74  65 78 74 25 3d 74 65 78  |......$text%=tex|
00000320  74 24 0d 01 cc 1a e7 41  24 3d 22 63 22 20 d6 64  |t$.....A$="c" .d|
00000330  65 73 25 20 8b 20 d6 64  64 65 73 25 0d 01 d6 0b  |es% . .ddes%....|
00000340  cf 23 46 25 3d 4f 25 0d  01 e0 0f e3 6c 6f 6f 70  |.#F%=O%.....loop|
00000350  31 25 3d 30 b8 37 0d 01  ea 1a 20 20 d5 23 46 25  |1%=0.7....  .#F%|
00000360  2c 3f 28 74 65 78 74 25  2b 6c 6f 6f 70 31 25 29  |,?(text%+loop1%)|
00000370  0d 01 f4 05 ed 0d 01 fe  1a f1 8a 31 38 2c 31 32  |...........18,12|
00000380  29 3b 4e 25 2d 6c 6f 6f  70 25 3b 22 20 22 3b 0d  |);N%-loop%;" ";.|
00000390  02 08 0b 4f 25 3d 4f 25  2b 38 0d 02 12 05 ed 0d  |...O%=O%+8......|
000003a0  02 1c 08 d9 23 46 25 0d  02 26 11 f1 27 27 22 46  |....#F%..&..''"F|
000003b0  69 6e 69 73 68 65 64 22  0d 02 30 0e f1 27 c4 34  |inished"..0..'.4|
000003c0  30 2c 22 2d 22 29 0d 02  3a 1b f1 22 41 6e 6f 74  |0,"-")..:.."Anot|
000003d0  68 65 72 20 66 69 6c 65  20 28 59 2f 4e 29 3f 22  |her file (Y/N)?"|
000003e0  3b 0d 02 44 05 f5 0d 02  4e 0f 41 24 3d bd 28 a5  |;..D....N.A$=.(.|
000003f0  20 84 33 32 29 0d 02 58  12 fd 41 24 3d 22 79 22  | .32)..X..A$="y"|
00000400  84 41 24 3d 22 6e 22 0d  02 62 0b fd 41 24 3d 22  |.A$="n"..b..A$="|
00000410  6e 22 0d 02 6c 05 db 0d  02 76 05 e0 0d 02 80 2f  |n"..l....v...../|
00000420  f4 20 2a 2a 2a 2a 2a 2a  2a 2a 2a 2a 2a 2a 2a 2a  |. **************|
00000430  2a 2a 2a 2a 2a 2a 2a 2a  2a 2a 2a 2a 2a 2a 2a 2a  |****************|
00000440  2a 2a 2a 2a 2a 2a 2a 2a  2a 2a 2a 0d 02 8a 05 3a  |***********....:|
00000450  0d 02 94 0d dd f2 6d 65  73 73 61 67 65 0d 02 9e  |......message...|
00000460  2b f1 22 54 68 65 20 66  69 6c 65 20 73 69 7a 65  |+."The file size|
00000470  20 69 73 20 6e 6f 74 20  64 69 76 69 73 61 62 6c  | is not divisabl|
00000480  65 20 62 79 20 38 2c 22  0d 02 a8 12 41 25 3d 53  |e by 8,"....A%=S|
00000490  25 2d 38 2a 28 53 25 81  38 29 0d 02 b2 33 f1 22  |%-8*(S%.8)...3."|
000004a0  74 68 65 20 6c 61 73 74  20 22 3b 41 25 3b 22 20  |the last ";A%;" |
000004b0  62 79 74 65 28 73 29 20  77 69 6c 6c 20 6e 6f 74  |byte(s) will not|
000004c0  20 62 65 20 61 6c 74 65  72 65 64 2e 22 0d 02 bc  | be altered."...|
000004d0  05 e1 0d ff                                       |....|
000004d4
DES.m0
DES.m1
DES.m2
DES.m4
DES.m5

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