private uint[][] GenerateWorkingKey(byte[] key, bool forEncryption) { int num = key.Length / 4; if (num != 4 && num != 6 && num != 8) { throw new ArgumentException("Key length not 128/192/256 bits."); } this.ROUNDS = num + 6; uint[][] array = new uint[this.ROUNDS + 1][]; for (int i = 0; i <= this.ROUNDS; i++) { array[i] = new uint[4]; } int num2 = 0; int j = 0; while (j < key.Length) { array[num2 >> 2][num2 & 3] = Pack.LE_To_UInt32(key, j); j += 4; num2++; } int num3 = this.ROUNDS + 1 << 2; for (int k = num; k < num3; k++) { uint num4 = array[k - 1 >> 2][k - 1 & 3]; if (k % num == 0) { num4 = (AesLightEngine.SubWord(AesLightEngine.Shift(num4, 8)) ^ (uint)AesLightEngine.rcon[k / num - 1]); } else if (num > 6 && k % num == 4) { num4 = AesLightEngine.SubWord(num4); } array[k >> 2][k & 3] = (array[k - num >> 2][k - num & 3] ^ num4); } if (!forEncryption) { for (int l = 1; l < this.ROUNDS; l++) { uint[] array2 = array[l]; for (int m = 0; m < 4; m++) { array2[m] = AesLightEngine.Inv_Mcol(array2[m]); } } } return(array); }
private void DecryptBlock(uint[][] KW) { uint[] array = KW[this.ROUNDS]; uint num = this.C0 ^ array[0]; uint num2 = this.C1 ^ array[1]; uint num3 = this.C2 ^ array[2]; uint num4 = this.C3 ^ array[3]; int i = this.ROUNDS - 1; uint num5; uint num6; uint num7; while (i > 1) { array = KW[i--]; num5 = (AesLightEngine.Inv_Mcol((uint)((int)AesLightEngine.Si[(int)((UIntPtr)(num & 255u))] ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num4 >> 8 & 255u))] << 8 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num3 >> 16 & 255u))] << 16 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num2 >> 24 & 255u))] << 24)) ^ array[0]); num6 = (AesLightEngine.Inv_Mcol((uint)((int)AesLightEngine.Si[(int)((UIntPtr)(num2 & 255u))] ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num >> 8 & 255u))] << 8 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num4 >> 16 & 255u))] << 16 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num3 >> 24 & 255u))] << 24)) ^ array[1]); num7 = (AesLightEngine.Inv_Mcol((uint)((int)AesLightEngine.Si[(int)((UIntPtr)(num3 & 255u))] ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num2 >> 8 & 255u))] << 8 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num >> 16 & 255u))] << 16 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num4 >> 24 & 255u))] << 24)) ^ array[2]); num4 = (AesLightEngine.Inv_Mcol((uint)((int)AesLightEngine.Si[(int)((UIntPtr)(num4 & 255u))] ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num3 >> 8 & 255u))] << 8 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num2 >> 16 & 255u))] << 16 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num >> 24 & 255u))] << 24)) ^ array[3]); array = KW[i--]; num = (AesLightEngine.Inv_Mcol((uint)((int)AesLightEngine.Si[(int)((UIntPtr)(num5 & 255u))] ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num4 >> 8 & 255u))] << 8 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num7 >> 16 & 255u))] << 16 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num6 >> 24 & 255u))] << 24)) ^ array[0]); num2 = (AesLightEngine.Inv_Mcol((uint)((int)AesLightEngine.Si[(int)((UIntPtr)(num6 & 255u))] ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num5 >> 8 & 255u))] << 8 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num4 >> 16 & 255u))] << 16 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num7 >> 24 & 255u))] << 24)) ^ array[1]); num3 = (AesLightEngine.Inv_Mcol((uint)((int)AesLightEngine.Si[(int)((UIntPtr)(num7 & 255u))] ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num6 >> 8 & 255u))] << 8 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num5 >> 16 & 255u))] << 16 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num4 >> 24 & 255u))] << 24)) ^ array[2]); num4 = (AesLightEngine.Inv_Mcol((uint)((int)AesLightEngine.Si[(int)((UIntPtr)(num4 & 255u))] ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num7 >> 8 & 255u))] << 8 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num6 >> 16 & 255u))] << 16 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num5 >> 24 & 255u))] << 24)) ^ array[3]); } array = KW[1]; num5 = (AesLightEngine.Inv_Mcol((uint)((int)AesLightEngine.Si[(int)((UIntPtr)(num & 255u))] ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num4 >> 8 & 255u))] << 8 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num3 >> 16 & 255u))] << 16 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num2 >> 24 & 255u))] << 24)) ^ array[0]); num6 = (AesLightEngine.Inv_Mcol((uint)((int)AesLightEngine.Si[(int)((UIntPtr)(num2 & 255u))] ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num >> 8 & 255u))] << 8 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num4 >> 16 & 255u))] << 16 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num3 >> 24 & 255u))] << 24)) ^ array[1]); num7 = (AesLightEngine.Inv_Mcol((uint)((int)AesLightEngine.Si[(int)((UIntPtr)(num3 & 255u))] ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num2 >> 8 & 255u))] << 8 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num >> 16 & 255u))] << 16 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num4 >> 24 & 255u))] << 24)) ^ array[2]); num4 = (AesLightEngine.Inv_Mcol((uint)((int)AesLightEngine.Si[(int)((UIntPtr)(num4 & 255u))] ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num3 >> 8 & 255u))] << 8 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num2 >> 16 & 255u))] << 16 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num >> 24 & 255u))] << 24)) ^ array[3]); array = KW[0]; this.C0 = (uint)((int)AesLightEngine.Si[(int)((UIntPtr)(num5 & 255u))] ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num4 >> 8 & 255u))] << 8 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num7 >> 16 & 255u))] << 16 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num6 >> 24 & 255u))] << 24 ^ (int)array[0]); this.C1 = (uint)((int)AesLightEngine.Si[(int)((UIntPtr)(num6 & 255u))] ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num5 >> 8 & 255u))] << 8 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num4 >> 16 & 255u))] << 16 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num7 >> 24 & 255u))] << 24 ^ (int)array[1]); this.C2 = (uint)((int)AesLightEngine.Si[(int)((UIntPtr)(num7 & 255u))] ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num6 >> 8 & 255u))] << 8 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num5 >> 16 & 255u))] << 16 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num4 >> 24 & 255u))] << 24 ^ (int)array[2]); this.C3 = (uint)((int)AesLightEngine.Si[(int)((UIntPtr)(num4 & 255u))] ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num7 >> 8 & 255u))] << 8 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num6 >> 16 & 255u))] << 16 ^ (int)AesLightEngine.Si[(int)((UIntPtr)(num5 >> 24 & 255u))] << 24 ^ (int)array[3]); }