Курсовая работа: Защита информации от несанкционированного доступа

const

FShTable: TConvertTable64 =

(57,49,41,33,25,17, 9, 1,59,51,

43,35,27,19,11, 3,61,53,45,37,

29,21,13, 5,63,55,47,39,31,23,

15, 7,56,48,40,32,24,16, 8, 0,

58,50,42,34,26,18,10, 2,60,52,

44,36,28,20,12, 4,62,54,46,38,

30,22,14, 6);

LShTable: TConvertTable64 =

(39, 7,47,15,55,23,63,31,38,6,

46,14,54,22,62,30,37, 5,45,13,

53,21,61,29,36, 4,44,12,52,20,

60,28,35, 3,43,11,51,19,59,27,

34, 2,42,10,50,18,58,26,33, 1,

41, 9,49,17,57,25,32, 0,40, 8,

48,16,56,24);

procedure K1Coding64bits(A: word64; var R: word64; K1:word64);

begin

convert(A,FShTable,R);

asm

push esi

mov esi,DWORD[R]

mov eax,DWORD[K1]

xor [esi],eax

add esi,4

mov eax,DWORD[K1+4]

xor [esi],eax

pop esi