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 &= 0x7FFFFFFFu;
if ((z[7] = num3 + Nat.AddWordTo(7, num2 * 19, z)) >= 2147483647 && Nat256.Gte(z, P))
{
SubPFrom(z);
}
}
public static void Reduce(uint[] xx, uint[] z)
{
uint c = xx[7];
Nat.ShiftUpBit(8, xx, 8, c, z, 0);
uint num2 = Nat256.MulByWordAddTo(0x13, xx, z) << 1;
uint num3 = z[7];
num2 += (num3 >> 0x1f) - (c >> 0x1f);
num3 &= 0x7fffffff;
num3 += Nat.AddWordTo(7, num2 * 0x13, z);
z[7] = num3;
if ((num3 >= 0x7fffffff) && Nat256.Gte(z, P))
{
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);
}
}
public static void Reduce(uint[] xx, uint[] z)
{
Debug.Assert(xx[15] >> 30 == 0);
uint xx07 = xx[7];
Nat.ShiftUpBit(8, xx, 8, xx07, z, 0);
uint c = Nat256.MulByWordAddTo(PInv, xx, z) << 1;
uint z07 = z[7];
z[7] = z07 & P7;
c += (z07 >> 31) - (xx07 >> 31);
Nat.AddWordTo(8, c * PInv, z);
if (Nat256.Gte(z, P))
{
AddPInvTo(z);
}
}
public static void Reduce(uint[] xx, uint[] z)
{
Debug.Assert(xx[15] >> 30 == 0);
uint xx07 = xx[7];
Nat.ShiftUpBit(8, xx, 8, xx07, z, 0);
uint c = Nat256.MulByWordAddTo(PInv, xx, z) << 1;
uint z7 = z[7];
c += (z7 >> 31) - (xx07 >> 31);
z7 &= P7;
z7 += Nat.AddWordTo(7, c * PInv, z);
z[7] = z7;
if (z7 >= P7 && Nat256.Gte(z, P))
{
SubPFrom(z);
}
}