2015-05-15
341
pl% = INSTR(12, header$, "#")
oldplainf$ = RIGHT$(header$, 24 - pl%)
PRINT " Имя исходного файла: "; oldplainf$;
OPEN oldplainf$ FOR RANDOM AS 2
IF INSTR(oldplainf$, ".") THEN
PRINT " ([*.*] ";
ELSE
PRINT " ([*] ";
END IF
IF LOF(2) > 0 THEN PRINT "уже есть в каталоге";
PRINT ")"
CLOSE #2
plainf$ = ""
INPUT " Имя выходного файла: ", plainf$
IF plainf$ = "" THEN plainf$ = oldplainf$
plainf$ = RTRIM$(LTRIM$(plainf$))
IF INSTR(plainf$, "*.") THEN
IF INSTR(oldplainf$, ".") THEN
plainf$ = LEFT$(plainf$, INSTR(plainf$, "*.") - 1) + LEFT$(oldplainf$, INSTR(oldplainf$, ".")) + RIGHT$(plainf$, LEN(plainf$) - INSTR(plainf$, "*.") - 1)
ELSE
plainf$ = LEFT$(plainf$, INSTR(plainf$, "*.") - 1) + oldplainf$ + RIGHT$(plainf$, LEN(plainf$) - INSTR(plainf$, "*."))
END IF
END IF
IF (RIGHT$(plainf$, 1) = "*") THEN
IF plainf$ = "*" THEN
plainf$ = oldplainf$
ELSE
IF (MID$(plainf$, LEN(plainf$) - 1, 1) = ".") THEN
plainf$ = LEFT$(plainf$, INSTR(plainf$, ".") - 1) +
RIGHT$(oldplainf$, LEN(oldplainf$) -
INSTR(oldplainf$, ".") + 1)
ELSE
plainf$ = LEFT$(plainf$, LEN(plainf$) - 1) + oldplainf$
END IF
END IF
END IF
IF RIGHT$(plainf$, 1) = "\" THEN plainf$ = plainf$ + oldplainf$
Продолжение листинга 18.4
OPEN plainf$ FOR RANDOM AS 2
IF LOF(2) > 0 THEN
CLOSE #2
PRINT: PRINT "Уже есть файл с таким именем!"
SYSTEM
ELSE
CLOSE #2
OPEN plainf$ FOR BINARY AS 2
END IF
plaintekst$ = ""
blocks& = (LOF(1) \ 8) - 3
LOCATE rescue% + 11, 21: PRINT; "Расшифровывание: 0 %";
bigblocks&=(blocks&-1) \ 32
large$=space$(256)
FOR m& = 1 TO bigblocks&
outblock$=""
get$ #1,256,large$
for o%=1 to 256 step 8
outblock$=outblock$+desalg$(mid$(large$,o%,8))
next
put$ #2,outblock$
LOCATE rescue% + 11, 32: PRINT; USING "###"; (m& / (bigblocks&+1)) * 100;
next
FOR n& = (bigblocks&*32)+1 TO blocks& - 1
GET$ #1,8,ciphertekst$
plaintekst$ = desalg$(ciphertekst$)
PUT$ #2, plaintekst$
LOCATE rescue% + 11, 32: PRINT; USING "###"; (n& / blocks&) * 100;
NEXT n&
get$ #1,8,ciphertekst$
if len(ciphertekst$) > 0 then
plaintekst$ = desalg$(ciphertekst$)
IF rescue% THEN
last$ = plaintekst$
ELSE
Продолжение листинга 18.4
last$ = LEFT$(plaintekst$, lf& + 32 - LOF(1))
END IF
IF LEN(last$) > 0 THEN
PUT$ #2, last$
END IF
end if
CLOSE
LOCATE 11 + rescue%, 32: PRINT "100 % готово": PRINT
IF rescue% THEN
PRINT "Попытайтесь другим способом расшифровать этот файл."
ELSE
PRINT "Расшифровывание по алгоритму DES завершено."
END IF
SYSTEM
' Данные и функции
InitialTrl:
DATA 58,50,42,34,26,18,10,02,60,52,44,36,28,20,12,04
DATA 62,54,46,38,30,22,14,06,64,56,48,40,32,24,16,08
DATA 57,49,41,33,25,17,09,01,59,51,43,35,27,19,11,03
DATA 61,53,45,37,29,21,13,05,63,55,47,39,31,23,15,07
FinalTrl:
DATA 40,08,48,16,56,24,64,32,39,07,47,15,55,23,63,31
DATA 38,06,46,14,54,22,62,30,37,05,45,13,53,21,61,29
DATA 36,04,44,12,52,20,60,28,35,03,43,11,51,19,59,27
DATA 34,02,42,10,50,18,58,26,33,01,41,09,49,17,57,25
swappyl:
DATA 33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48
DATA 49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64
DATA 01,02,03,04,05,06,07,08,09,10,11,12,13,14,15,16
DATA 17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32
KeyTr1l:
DATA 57,49,41,33,25,17,09,01,58,50,42,34,26,18,10,02
DATA 59,51,43,35,27,19,11,03,60,52,44,36
DATA 63,55,47,39,31,23,15,07,62,54,46,38,30,22,14,06
DATA 61,53,45,37,29,21,13,05,28,20,12,04
Продолжение листинга 18.4
KeyTr2l:
DATA 14,17,11,24,01,05,03,28,15,06,21,10,23,19,12,04
DATA 26,08,16,07,27,20,13,02,41,52,31,37,47,55,30,40
DATA 51,45,33,48,44,49,39,56,34,53,46,42,50,36,29,32
etrl:
DATA 32,01,02,03,04,05,04,05,06,07,08,09,08,09,10,11
DATA 12,13,12,13,14,15,16,17,16,17,18,19,20,21,20,21
DATA 22,23,24,25,24,25,26,27,28,29,28,29,30,31,32,01
ptrl:
DATA 16,07,20,21,29,12,28,17,01,15,23,26,05,18,31,10
DATA 02,08,24,14,32,27,03,09,19,13,30,06,22,11,04,25
sboxesl:
DATA 14,04,13,01,02,15,11,08,03,10,06,12,05,09,00,07
DATA 00,15,07,04,14,02,13,01,10,06,12,11,09,05,03,08
DATA 04,01,14,08,13,06,02,11,15,12,09,07,03,10,05,00
DATA 15,12,08,02,04,09,01,07,05,11,03,14,10,00,06,13
DATA 15,01,08,14,06,11,03,04,09,07,02,13,12,00,05,10
DATA 03,13,04,07,15,02,08,14,12,00,01,10,06,09,11,05
DATA 00,14,07,11,10,04,13,01,05,08,12,06,09,03,02,15
DATA 13,08,10,01,03,15,04,02,11,06,07,12,00,05,14,09
DATA 10,00,09,14,06,03,15,05,01,13,12,07,11,04,02,08
DATA 13,07,00,09,03,04,06,10,02,08,05,14,12,11,15,01
DATA 13,06,04,09,08,15,03,00,11,01,02,12,05,10,14,07
DATA 01,10,13,00,06,09,08,07,04,15,14,03,11,05,02,12
DATA 07,13,14,03,00,06,09,10,01,02,08,05,11,12,04,15
DATA 13,08,11,05,06,15,00,03,04,07,02,12,01,10,14,09
DATA 10,06,09,00,12,11,07,13,15,01,03,14,05,02,08,04
DATA 03,15,00,06,10,01,13,08,09,04,05,11,12,07,02,14
DATA 02,12,04,01,07,10,11,06,08,05,03,15,13,00,14,09
DATA 14,11,02,12,04,07,13,01,05,00,15,10,03,09,08,06
DATA 04,02,01,11,10,13,07,08,15,09,12,05,06,03,00,14
DATA 11,08,12,07,01,14,02,13,06,15,00,09,10,04,05,03
