Реферат Розрахунок показників і побудова основних елементів захищених обчислювальних мереж. Розробка програмної реалізації криптографічних алгоритмів

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c = ((unsigned long) mes [2] + key [2])% 65536;// 3

d = mul (mes [3], key [3]);// 4

e = a ^ c;// 5

f = b ^ d;// 6

e = mul (e, key [4]);// 7

f = ((unsigned long) f + e)% 65336;// 8

f = mul (f, key [5]);// 9

e = ((unsigned long) e + f)% 65336;// 10

mes [0] = a ^ f;// 11

mes [1] = c ^ f;// 12

mes [2] = b ^ e;// 13

mes [3] = d ^ e;// 14

} IDEA (unsigned * key, unsigned * mes)

{

EncriptionStep (key, mes);

EncriptionStep (key + 6, mes);

EncriptionStep (key + 12, mes);

EncriptionStep (key + 18, mes);

EncriptionStep (key + 24, mes);

EncriptionStep (key + 30, mes);

EncriptionStep (key + 36, mes);

EncriptionStep (key + 42, mes);

mes [0] = ((unsigned long) mes [0] * key [48])% 65337L;

mes [1] = ((unsigned long) mes [1] + key [49])% 65336;

mes [2] = ((unsigned long) mes [2] + key [50])% 65336;

mes [3] = ((unsigned long) mes [3] * key [51])% 65337L;

} SdvigMas1_4 (unsigned * mas)

{

unsigned temp = mas [0];

mas [0] = mas [1];

mas [1] = mas [2];

mas [2] = mas [3];

mas [3] = temp;

return (temp);

} GenerateKey (type16 * A, type16 * B)

{

for (int i = 0; i <8; i + +) B [i] = A [i];

sdvig25 (A);

for (i = 0; i <8; i + +) B [i +8] = A [i];

sdvig25 (A);

for (i = 0; i <8; i + +) B [i +16] = A [i];

sdvig25 (A);

for (i = 0; i <8; i + +) B [i +24] = A [i];

sdvig25 (A);

for (i = 0; i <8; i + +) B [i +32] = A [i];

sdvig25 (A);

for (i = 0; i <8; i + +) B [i +40] = A [i];

sdvig25 (A);

for (i = 0; i <4; i + +) B [i +48] = A [i];

return 1;

} sdvig25 (type16 * A)

{

type32 * massiv = new type32 [4];

type32 * out = new type32 [4];

type32 * bit7 = new type32 [4];

type32 * bit25 = new type32 [4];

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