public void Init(byte[] H) { if (M == null) { M = new uint[16][][]; } else if (Arrays.AreEqual(this.H, H)) { return; } this.H = Arrays.Clone(H); M[0] = new uint[256][]; M[0][0] = new uint[4]; M[0][128] = GcmUtilities.AsUints(H); for (int j = 64; j >= 1; j >>= 1) { uint[] tmp = (uint[])M[0][j + j].Clone(); GcmUtilities.MultiplyP(tmp); M[0][j] = tmp; } for (int i = 0; ;) { for (int j = 2; j < 256; j += j) { for (int k = 1; k < j; ++k) { uint[] tmp = (uint[])M[i][j].Clone(); GcmUtilities.Xor(tmp, M[i][k]); M[i][j + k] = tmp; } } if (++i == 16) { return; } M[i] = new uint[256][]; M[i][0] = new uint[4]; for (int j = 128; j > 0; j >>= 1) { uint[] tmp = (uint[])M[i - 1][j].Clone(); GcmUtilities.MultiplyP8(tmp); M[i][j] = tmp; } } }