public static byte[] GenerateWindowNaf(int width, BigInteger k)
{
if (width == 2)
{
return(WNafUtilities.GenerateNaf(k));
}
if (width < 2 || width > 8)
{
throw new ArgumentException("must be in the range [2, 8]", "width");
}
if (k.SignValue == 0)
{
return(WNafUtilities.EMPTY_BYTES);
}
byte[] array = new byte[k.BitLength + 1];
int num = 1 << width;
int num2 = num - 1;
int num3 = num >> 1;
bool flag = false;
int num4 = 0;
int i = 0;
while (i <= k.BitLength)
{
if (k.TestBit(i) == flag)
{
i++;
}
else
{
k = k.ShiftRight(i);
int num5 = k.IntValue & num2;
if (flag)
{
num5++;
}
flag = ((num5 & num3) != 0);
if (flag)
{
num5 -= num;
}
num4 += ((num4 > 0) ? (i - 1) : i);
array[num4++] = (byte)num5;
i = width;
}
}
if (array.Length > num4)
{
array = WNafUtilities.Trim(array, num4);
}
return(array);
}
