public static int[] square(int[] a, int aLen, int[] res)
{
long carry;
for (int i = 0; i < aLen; i++)
{
carry = 0;
for (int j = i + 1; j < aLen; j++)
{
carry = unsignedMultAddAdd(a[i], a[j], res[i + j], (int)carry);
res[i + j] = (int)carry;
carry = (long)(((ulong)carry) >> 32);
}
res[i + aLen] = (int)carry;
}
BitLevel.shiftLeftOneBit(res, res, aLen << 1);
carry = 0;
for (int i = 0, index = 0; i < aLen; i++, index++)
{
carry = unsignedMultAddAdd(a[i], a[i], res[index], (int)carry);
res[index] = (int)carry;
carry = (long)(((ulong)carry) >> 32);
index++;
carry += res[index] & 0xFFFFFFFFL;
res[index] = (int)carry;
carry = (long)(((ulong)carry) >> 32);
}
return(res);
}
internal BigInteger shiftLeftOneBit()
{
return((sign == 0) ? this : BitLevel.shiftLeftOneBit(this));
}