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using System;
using System.Diagnostics;
using Org.BouncyCastle.Math.Raw;
namespace Org.BouncyCastle.Math.EC.Custom.Sec
{
internal class SecT571Field
{
private const ulong M59 = ulong.MaxValue >> 5;
private const ulong RM = 0xEF7BDEF7BDEF7BDEUL;
public static void Add(ulong[] x, ulong[] y, ulong[] z)
{
for (int i = 0; i < 9; ++i)
{
z[i] = x[i] ^ y[i];
}
}
private static void Add(ulong[] x, int xOff, ulong[] y, int yOff, ulong[] z, int zOff)
{
for (int i = 0; i < 9; ++i)
{
z[zOff + i] = x[xOff + i] ^ y[yOff + i];
}
}
private static void AddBothTo(ulong[] x, int xOff, ulong[] y, int yOff, ulong[] z, int zOff)
{
for (int i = 0; i < 9; ++i)
{
z[zOff + i] ^= x[xOff + i] ^ y[yOff + i];
}
}
public static void AddExt(ulong[] xx, ulong[] yy, ulong[] zz)
{
for (int i = 0; i < 18; ++i)
{
zz[i] = xx[i] ^ yy[i];
}
}
public static void AddOne(ulong[] x, ulong[] z)
{
z[0] = x[0] ^ 1UL;
for (int i = 1; i < 9; ++i)
{
z[i] = x[i];
}
}
public static ulong[] FromBigInteger(BigInteger x)
{
ulong[] z = Nat576.FromBigInteger64(x);
Reduce5(z, 0);
return z;
}
public static void Multiply(ulong[] x, ulong[] y, ulong[] z)
{
ulong[] tt = Nat576.CreateExt64();
ImplMultiply(x, y, tt);
Reduce(tt, z);
}
public static void MultiplyAddToExt(ulong[] x, ulong[] y, ulong[] zz)
{
ulong[] tt = Nat576.CreateExt64();
ImplMultiply(x, y, tt);
AddExt(zz, tt, zz);
}
public static void Reduce(ulong[] xx, ulong[] z)
{
ulong xx09 = xx[9];
ulong u = xx[17], v = xx09;
xx09 = v ^ (u >> 59) ^ (u >> 57) ^ (u >> 54) ^ (u >> 49);
v = xx[8] ^ (u << 5) ^ (u << 7) ^ (u << 10) ^ (u << 15);
for (int i = 16; i >= 10; --i)
{
u = xx[i];
z[i - 8] = v ^ (u >> 59) ^ (u >> 57) ^ (u >> 54) ^ (u >> 49);
v = xx[i - 9] ^ (u << 5) ^ (u << 7) ^ (u << 10) ^ (u << 15);
}
u = xx09;
z[1] = v ^ (u >> 59) ^ (u >> 57) ^ (u >> 54) ^ (u >> 49);
v = xx[0] ^ (u << 5) ^ (u << 7) ^ (u << 10) ^ (u << 15);
ulong x08 = z[8];
ulong t = x08 >> 59;
z[0] = v ^ t ^ (t << 2) ^ (t << 5) ^ (t << 10);
z[8] = x08 & M59;
}
public static void Reduce5(ulong[] z, int zOff)
{
ulong z8 = z[zOff + 8], t = z8 >> 59;
z[zOff ] ^= t ^ (t << 2) ^ (t << 5) ^ (t << 10);
z[zOff + 8] = z8 & M59;
}
public static void Square(ulong[] x, ulong[] z)
{
ulong[] tt = Nat576.CreateExt64();
ImplSquare(x, tt);
Reduce(tt, z);
}
public static void SquareAddToExt(ulong[] x, ulong[] zz)
{
ulong[] tt = Nat576.CreateExt64();
ImplSquare(x, tt);
AddExt(zz, tt, zz);
}
public static void SquareN(ulong[] x, int n, ulong[] z)
{
Debug.Assert(n > 0);
ulong[] tt = Nat576.CreateExt64();
ImplSquare(x, tt);
Reduce(tt, z);
while (--n > 0)
{
ImplSquare(z, tt);
Reduce(tt, z);
}
}
protected static void ImplMultiply(ulong[] x, ulong[] y, ulong[] zz)
{
//for (int i = 0; i < 9; ++i)
//{
// ImplMulwAcc(x, y[i], zz, i);
//}
/*
* Precompute table of all 4-bit products of y
*/
ulong[] T0 = new ulong[9 << 4];
Array.Copy(y, 0, T0, 9, 9);
// Reduce5(T0, 9);
int tOff = 0;
for (int i = 7; i > 0; --i)
{
tOff += 18;
Nat.ShiftUpBit64(9, T0, tOff >> 1, 0UL, T0, tOff);
Reduce5(T0, tOff);
Add(T0, 9, T0, tOff, T0, tOff + 9);
}
/*
* Second table with all 4-bit products of B shifted 4 bits
*/
ulong[] T1 = new ulong[T0.Length];
Nat.ShiftUpBits64(T0.Length, T0, 0, 4, 0L, T1, 0);
uint MASK = 0xF;
/*
* Lopez-Dahab algorithm
*/
for (int k = 56; k >= 0; k -= 8)
{
for (int j = 1; j < 9; j += 2)
{
uint aVal = (uint)(x[j] >> k);
uint u = aVal & MASK;
uint v = (aVal >> 4) & MASK;
AddBothTo(T0, (int)(9 * u), T1, (int)(9 * v), zz, j - 1);
}
Nat.ShiftUpBits64(16, zz, 0, 8, 0L);
}
for (int k = 56; k >= 0; k -= 8)
{
for (int j = 0; j < 9; j += 2)
{
uint aVal = (uint)(x[j] >> k);
uint u = aVal & MASK;
uint v = (aVal >> 4) & MASK;
AddBothTo(T0, (int)(9 * u), T1, (int)(9 * v), zz, j);
}
if (k > 0)
{
Nat.ShiftUpBits64(18, zz, 0, 8, 0L);
}
}
}
protected static void ImplMulwAcc(ulong[] xs, ulong y, ulong[] z, int zOff)
{
ulong[] u = new ulong[32];
//u[0] = 0;
u[1] = y;
for (int i = 2; i < 32; i += 2)
{
u[i ] = u[i >> 1] << 1;
u[i + 1] = u[i ] ^ y;
}
ulong l = 0;
for (int i = 0; i < 9; ++i)
{
ulong x = xs[i];
uint j = (uint)x;
l ^= u[j & 31];
ulong g, h = 0;
int k = 60;
do
{
j = (uint)(x >> k);
g = u[j & 31];
l ^= (g << k);
h ^= (g >> -k);
}
while ((k -= 5) > 0);
for (int p = 0; p < 4; ++p)
{
x = (x & RM) >> 1;
h ^= x & (ulong)(((long)y << p) >> 63);
}
z[zOff + i] ^= l;
l = h;
}
z[zOff + 9] ^= l;
}
protected static void ImplSquare(ulong[] x, ulong[] zz)
{
for (int i = 0; i < 9; ++i)
{
Interleave.Expand64To128(x[i], zz, i << 1);
}
}
}
}
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