Продолжение листинга 18.4

DATA 12,01,10,15,09,02,06,08,00,13,03,04,14,07,05,11
DATA 10,15,04,02,07,12,09,05,06,01,13,14,00,11,03,08
DATA 09,14,15,05,02,08,12,03,07,00,04,10,01,13,11,06
DATA 04,03,02,12,09,05,15,10,11,14,01,07,06,00,08,13

DATA 04,11,02,14,15,00,08,13,03,12,09,07,05,10,06,01
DATA 13,00,11,07,04,09,01,10,14,03,05,12,02,15,08,06
DATA 01,04,11,13,12,03,07,14,10,15,06,08,00,05,09,02
DATA 06,11,13,08,01,04,10,07,09,05,00,15,14,02,03,12

DATA 13,02,08,04,06,15,11,01,10,09,03,14,05,00,12,07
DATA 01,15,13,08,10,03,07,04,12,05,06,11,00,14,09,02
DATA 07,11,04,01,09,12,14,02,00,06,10,13,15,03,05,08
DATA 02,01,14,07,04,10,08,13,15,12,09,00,03,05,06,11

rotsl:
DATA 1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1

SUB btos (mbits() AS INTEGER, a$)
a$ = ""
FOR i% = 1 TO 8
w% = 0
FOR j% = 1 TO 8
w% = w% + ((mbits(((i% - 1) * 8) + j%)) * (2 ^ (8 - j%)))
NEXT j%
a$ = a$ + CHR$(w%)
NEXT i%
END SUB

FUNCTION desalg$ (a$)
temp$ = "": stob a$, ades()
transpose ades(), InitialTr(), 64
transpose ades(), swappy(), 64
FOR i% = 16 TO 1 STEP -1
letbe bdes(), ades(), 64
f i%, bdes(), xdes()
FOR j% = 1 TO 32
ades(j%) = (bdes(j% + 32) + xdes(j%)) MOD 2
NEXT j%
FOR j% = 33 TO 64
ades(j%) = bdes(j% - 32)

Продолжение листинга 18.4

NEXT j%
NEXT i%
transpose ades(), FinalTr(), 64
btos ades(), temp$
desalg$ = temp$
END FUNCTION

SUB f (i%, a() AS INTEGER, x() AS INTEGER)
h% = i%: letbe EF(), a(), 64
transpose EF(), etr(), 48
letbe ikeyf(), P2(), 64
transpose ikeyf(), KeyTr2(), 48
FOR j% = 1 TO rots(h%)
mrotate P2()
NEXT j%

FOR j% = 1 TO 48
yf(j%) = (EF(j%) + ikeyf(j%)) MOD 2
NEXT j%
FOR k% = 1 TO 8
k6% = 6 * k%: k4% = 4 * k%
r% = (32 * yf(k6% - 5)) + (16 * yf(k6%)) + (8 * yf(k6% - 4)) + (4 * yf(k6% - 3)) + (2 * yf(k6% - 2)) + yf(k6% - 1) + 1
x(k4% - 3) = (s(k%, r%) \ 8) MOD 2: x(k4% - 2) = (s(k%, r%) \ 4) MOD 2
x(k4% - 1) = (s(k%, r%) \ 2) MOD 2: x(k4%) = s(k%, r%) MOD 2
NEXT k%
transpose x(), ptr(), 32
END SUB

SUB init (x() AS INTEGER, n%)
FOR i% = 1 TO n%
READ x(i%)
NEXT i%
END SUB

SUB letbe (target() AS INTEGER, source() AS INTEGER, last%)
FOR il% = 1 TO last%
target(il%) = source(il%)
NEXT il%
END SUB

Продолжение листинга 18.4

FUNCTION MYBIN$ (n%)
STS$ = ""
p% = n%
FOR i% = 1 TO 8
IF (p% MOD 2) THEN
ST$ = "1" + ST$
ELSE
ST$ = "0" + ST$
END IF
p% = p% \ 2
NEXT i%
MYBIN$ = ST$
END FUNCTION

SUB mrotate (keyr() AS INTEGER)
letbe XR(), keyr(), 56
FOR ir% = 56 TO 2 STEP -1
XR(ir%) = XR(ir% - 1)
NEXT ir%
XR(1) = keyr(28): XR(29) = keyr(56)
letbe keyr(), XR(), 56
END SUB

SUB sboxinit (b() AS INTEGER)
RESTORE sboxesl
FOR i% = 1 TO 8
FOR j% = 1 TO 64
READ b(i%, j%)
NEXT j%
NEXT i%
END SUB

SUB stob (a$, mbits() AS INTEGER)
FOR i% = 1 TO 8
b$ = MYBIN$(ASC(MID$(a$, i%, 1)))
FOR j% = 1 TO 8
mbits(((i% - 1) * 8) + j%) = ASC(MID$(b$, j%, 1)) - 48
NEXT j%
NEXT i%
END SUB

Продолжение листинга 18.4

SUB transpose (datax() AS INTEGER, T() AS INTEGER, nt%)
letbe XT(), datax(), 64
FOR i% = 1 TO nt%
datax(i%) = XT(T(i%))
NEXT i%
END SUB

SUB xtob (a$, mbits() AS INTEGER)
LOCAL X$,NIBBLE$
FOR i% = 1 to 16
X$ = MID$(a$,i%,1)
SELECT CASE X$
CASE "0"
NIBBLE$ = "0000"
CASE "1"
NIBBLE$ = "0001"
CASE "2"
NIBBLE$ = "0010"
CASE "3"
NIBBLE$ = "0011"
CASE "4"
NIBBLE$ = "0100"
CASE "5"
NIBBLE$ = "0101"
CASE "6"
NIBBLE$ = "0110"
CASE "7"
NIBBLE$ = "0111"
CASE "8"
NIBBLE$ = "1000"
CASE "9"
NIBBLE$ = "1001"
CASE "A"
NIBBLE$ = "1010"
CASE "B"
NIBBLE$ = "1011"
CASE "C"
NIBBLE$ = "1100"
CASE "D"
NIBBLE$ = "1101"
CASE "E"

Окончание листинга 18.4

NIBBLE$ = "1110"
CASE "F"
NIBBLE$ = "1111"
CASE ELSE
Print "Не является 16-ричным значением!"
SYSTEM
END SELECT
FOR j% = 1 to 4
mbits(((i% - 1) * 4) + j%) = ASC(MID$(NIBBLE$, j%, 1)) - 48
NEXT j%
NEXT i%
END SUB