public static void AddOne(uint[] x, uint[] z)
{
Nat.Inc(8, x, z);
if (Nat256.Gte(z, Curve25519Field.P))
{
Curve25519Field.SubPFrom(z);
}
}
public static void Add(uint[] x, uint[] y, uint[] z)
{
Nat256.Add(x, y, z);
if (Nat256.Gte(z, Curve25519Field.P))
{
Curve25519Field.SubPFrom(z);
}
}
public static void Twice(uint[] x, uint[] z)
{
Nat.ShiftUpBit(8, x, 0u, z);
if (Nat256.Gte(z, Curve25519Field.P))
{
Curve25519Field.SubPFrom(z);
}
}
public static void Reduce27(uint x, uint[] z)
{
uint num = z[7];
uint num2 = x << 1 | num >> 31;
num &= 2147483647u;
num += Nat.AddWordTo(7, num2 * 19u, z);
z[7] = num;
if (num >= 2147483647u && Nat256.Gte(z, Curve25519Field.P))
{
Curve25519Field.SubPFrom(z);
}
}
public static void Reduce(uint[] xx, uint[] z)
{
uint num = xx[7];
Nat.ShiftUpBit(8, xx, 8, num, z, 0);
uint num2 = Nat256.MulByWordAddTo(19u, xx, z) << 1;
uint num3 = z[7];
num2 += (num3 >> 31) - (num >> 31);
num3 &= 2147483647u;
num3 += Nat.AddWordTo(7, num2 * 19u, z);
z[7] = num3;
if (num3 >= 2147483647u && Nat256.Gte(z, Curve25519Field.P))
{
Curve25519Field.SubPFrom(z);
}
}
