public static BigInteger ValidatePublicValue(BigInteger N, BigInteger val)
{
val = val.Mod(N);
if (val.Equals(BigInteger.Zero))
{
throw new Exception("Invalid public value: 0");
}
return val;
}
public BigInteger ModPow(BigInteger exponent, BigInteger m)
{
if (m.sign < 1)
{
throw new ArithmeticException("Modulus must be positive");
}
if (m.Equals(One))
{
return Zero;
}
if (exponent.sign == 0)
{
return One;
}
if (this.sign == 0)
{
return Zero;
}
int[] array = null;
int[] a = null;
bool flag = (m.magnitude[m.magnitude.Length - 1] & 1) == 1;
long mQuote = 0L;
if (flag)
{
mQuote = m.GetMQuote();
array = this.ShiftLeft(0x20 * m.magnitude.Length).Mod(m).magnitude;
flag = array.Length <= m.magnitude.Length;
if (flag)
{
a = new int[m.magnitude.Length + 1];
if (array.Length < m.magnitude.Length)
{
int[] numArray4 = new int[m.magnitude.Length];
array.CopyTo(numArray4, (int)(numArray4.Length - array.Length));
array = numArray4;
}
}
}
if (!flag)
{
if (this.magnitude.Length <= m.magnitude.Length)
{
array = new int[m.magnitude.Length];
this.magnitude.CopyTo(array, (int)(array.Length - this.magnitude.Length));
}
else
{
BigInteger integer2 = this.Remainder(m);
array = new int[m.magnitude.Length];
integer2.magnitude.CopyTo(array, (int)(array.Length - integer2.magnitude.Length));
}
a = new int[m.magnitude.Length * 2];
}
int[] numArray3 = new int[m.magnitude.Length];
for (int i = 0; i < exponent.magnitude.Length; i++)
{
int num3 = exponent.magnitude[i];
int num4 = 0;
if (i == 0)
{
while (num3 > 0)
{
num3 = num3 << 1;
num4++;
}
array.CopyTo(numArray3, 0);
num3 = num3 << 1;
num4++;
}
while (num3 != 0)
{
if (flag)
{
MultiplyMonty(a, numArray3, numArray3, m.magnitude, mQuote);
}
else
{
Square(a, numArray3);
this.Remainder(a, m.magnitude);
Array.Copy(a, a.Length - numArray3.Length, numArray3, 0, numArray3.Length);
ZeroOut(a);
}
num4++;
if (num3 < 0)
{
if (flag)
{
MultiplyMonty(a, numArray3, array, m.magnitude, mQuote);
}
else
{
Multiply(a, numArray3, array);
this.Remainder(a, m.magnitude);
Array.Copy(a, a.Length - numArray3.Length, numArray3, 0, numArray3.Length);
ZeroOut(a);
}
}
num3 = num3 << 1;
}
while (num4 < 0x20)
{
if (flag)
{
MultiplyMonty(a, numArray3, numArray3, m.magnitude, mQuote);
}
else
{
Square(a, numArray3);
this.Remainder(a, m.magnitude);
Array.Copy(a, a.Length - numArray3.Length, numArray3, 0, numArray3.Length);
ZeroOut(a);
}
num4++;
}
}
if (flag)
{
ZeroOut(array);
array[array.Length - 1] = 1;
MultiplyMonty(a, numArray3, array, m.magnitude, mQuote);
}
BigInteger integer3 = new BigInteger(1, numArray3, true);
if (exponent.sign <= 0)
{
return integer3.ModInverse(m);
}
return integer3;
}
