static void scalarMultiply(byte[] resFirst, byte[] resSecond, byte[] genx, byte[] geny, byte[] k)
{
bool flag = false;
byte[] two = { 2 };
byte[] tempFirst = null, tempSecond = null, accFirst, accSecond;
accFirst = genx;
accSecond = geny;
k = byteArithmetic.divm_byte_arr(k, CurveData.getp()); byte[] temp = { 2 };
while (checkzero(k))
{
byte[] t = byteArithmetic.divm_byte_arr(k, temp);
if (checkzero(t))
{
if (flag == false)
{
tempFirst = byteArithmetic.Add(CurveData.getp(), accFirst);
tempFirst = byteArithmetic.divm_byte_arr(tempFirst, CurveData.getp());
tempSecond = byteArithmetic.Add(CurveData.getp(), accSecond);
tempSecond = byteArithmetic.divm_byte_arr(tempSecond, CurveData.getp());
flag = true;
}
}
else
{
add(tempFirst, tempSecond, resFirst, resSecond, accFirst, accSecond);
}
resFirst = tempFirst; resSecond = tempSecond;
}
doubling(tempFirst, tempSecond, accFirst, accSecond);
accFirst = tempFirst; accSecond = tempSecond;
k = byteArithmetic.divq_byte_arr(k, two);
}
static void add(byte[] PFirst, byte[] PSecond, byte[] RFirst, byte[] RSecond, byte[] QFirst, byte[] QSecond)
{
// cout<<"add "<<Q.first<<" "<<P.first<<endl;
byte[] slope;
slope = byteArithmetic.divq_byte_arr(byteArithmetic.Subtract(QSecond, PSecond), byteArithmetic.Subtract(QFirst, PFirst));
RFirst = byteArithmetic.Subtract(byteArithmetic.Subtract(byteArithmetic.Add(CurveData.getp(), byteArithmetic.Multiply(slope, slope)), PFirst), QFirst);
RFirst = byteArithmetic.divm_byte_arr(RFirst, CurveData.getp());
RSecond = byteArithmetic.Subtract(byteArithmetic.Add(CurveData.getp(), byteArithmetic.Multiply(slope, byteArithmetic.Subtract(PFirst, RFirst))), PSecond);
RSecond = byteArithmetic.divm_byte_arr(RSecond, CurveData.getp());
}
static void doubling(byte[] PFirst, byte[] PSecond, byte[] RFirst, byte[] RSecond)
{
// cout<<"DOUBLING "<<P.second<<"\n";
byte[] x, y;
byte[] slope, div;
byte[] temp = { 3 }, temp1 = { 2 };
slope = byteArithmetic.Add(CurveData.geta(), byteArithmetic.Multiply(PFirst, byteArithmetic.Multiply(temp, PSecond)));
div = byteArithmetic.Multiply(temp1, PSecond);
slope = byteArithmetic.divq_byte_arr(slope, div);
x = byteArithmetic.Subtract(byteArithmetic.Add(CurveData.getp(), byteArithmetic.Multiply(slope, slope)), byteArithmetic.Multiply(temp1, PFirst));
x = byteArithmetic.divm_byte_arr(x, CurveData.getp());
y = byteArithmetic.Subtract(byteArithmetic.Add(CurveData.getp(), byteArithmetic.Multiply(slope, byteArithmetic.Subtract(PSecond, PSecond))), PSecond);
y = byteArithmetic.divm_byte_arr(y, CurveData.getp());
RFirst = x; RSecond = y;
}