internal static Array BigIntegerToBytes(BigInteger b, int numBytes)
{
if (b == null)
{
return(null);
}
byte[] bytes = new byte[numBytes];
byte[] biBytes = b.ToByteArray();
int start = (biBytes.Length == numBytes + 1) ? 1 : 0;
int length = Math.Min(biBytes.Length, numBytes);
Array.Copy(biBytes, start, bytes, numBytes - length, length);
return(bytes);
}
internal static byte[] BigIntegerToBytes(BigInteger num)
#endif
{
if (num == 0)
{
//Positive 0 is represented by a null-length vector
return(new byte[0]);
}
bool isPositive = true;
if (num < 0)
{
isPositive = false;
num *= -1;
}
var array = num.ToByteArray();
if (!isPositive)
{
array[array.Length - 1] |= 0x80;
}
return(array);
}