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

turn B;: A = (A * A)% n;

goto s2;

}

2. ext128.cpp

// ==================== 128 bits ariphmetics ================= =

// ===================== 23.05.01 ==== 20.42 =========== =======

// =================== (c) 2001 by A.Bashmakov ============= = Data

{a [2]; long b;

} point;

// ---------------------------------------- ------------------------ Mult16 (unsigned *, unsigned *, unsigned *); Div16 (unsigned *, unsigned *, unsigned *, unsigned *) ; Sum16 (unsigned *, unsigned *, unsigned *); Razn16 (unsigned *, unsigned *, unsigned *); Pow_N (unsigned *, unsigned *, unsigned *, unsigned *); ModN (unsigned *, unsigned *);

// ---------------------------------------- ------------------------ Mult16 (unsigned a [9], unsigned b [9], unsigned rez [18])

{//a * b = rez; a & b max 128 bit, rez - 256 bit

unsigned st16 = 0U;

unsigned ml16 = 0U;

unsigned long temp = 0L;

for (int j = 0; j <16; j + +) rez [j] = 0U;

a [8] = 0;

b [8] = 0;

for (j = 0; j <9; j + +)

{

for (int i = 0; i <9; i + +)

{

if (i == 0)

{

rez [9 + j] = st16;

st16 = 0;

}

point.b = (unsigned long) a [i] * (unsigned long) b [j];

ml16 = point.a [0];

temp = (unsigned long) rez [i + j] + (unsigned long) ml16 + st16;

rez [i + j] + = ml16 + st16;

st16 = point.a [1] + (unsigned) (temp>> 16);

if ((j == 8) && (i == 8)) rez [i + j +1] = st16;

}

}

}

// ---------------------------------------- ------------------------ Sum16 (unsigned a [16], unsigned b [16], unsigned rez [16])

{//a + b = rez;

unsigned perepS = 0;

unsigned j = 0;

for (int i = 0; i <8; i + +)

{

point.b = (unsigned long) b [i] + (unsigned long) a [i] + perepS;

rez [j] = point.a [0];

perepS = point.a [1];

j + +;

}

rez [j] = perepS;

}

// ---------------------------------------- ------------------------ ModN (unsigned a [16], ...