MegaApi.Sjcl.Cipher.Aes.Aes C# (CSharp) Метод

                public Aes(uint[] key)
                {
                    int i, j;
                    uint tmp;
                    uint[] sbox = _tables[0][4];
                    var decTable = _tables[1];
                    int keyLen = key.Length;
                    uint rcon = 1;
                    uint[] encKey = new uint[4 * keyLen + 28];
                    uint[] decKey = new uint[4 * keyLen + 28];

                    if (keyLen != 4 && keyLen != 6 && keyLen != 8)
                    {
                        throw new Exception("invalid aes key size");
                    }
                    Array.Copy(key, 0, encKey, 0, keyLen);
                    this._key = new uint[][] { encKey, decKey };

                    // schedule encryption keys
                    for (i = keyLen; i < 4 * keyLen + 28; i++)
                    {
                        tmp = encKey[i - 1];

                        // apply sbox
                        if (i % keyLen == 0 || (keyLen == 8 && i % keyLen == 4))
                        {
                            tmp = sbox[tmp >> 24] << 24 ^ sbox[tmp >> 16 & 255] << 16 ^ sbox[tmp >> 8 & 255] << 8 ^ sbox[tmp & 255];

                            // shift rows and add rcon
                            if ((i % keyLen) == 0)
                            {
                                tmp = (tmp << 8) ^ (tmp >> 24) ^ (rcon << 24);
                                rcon = rcon << 1 ^ (rcon >> 7) * 283;
                            }
                        }

                        encKey[i] = encKey[i - keyLen] ^ tmp;
                    }

                    // schedule decryption keys
                    for (j = 0; i != 0; j++, i--)
                    {
                        tmp = encKey[(j & 3) != 0 ? i : i - 4];
                        if (i <= 4 || j < 4)
                        {
                            decKey[j] = tmp;
                        }
                        else
                        {
                            decKey[j] = decTable[0][sbox[tmp >> 24]] ^
                                        decTable[1][sbox[tmp >> 16 & 255]] ^
                                        decTable[2][sbox[tmp >> 8 & 255]] ^
                                        decTable[3][sbox[tmp & 255]];
                        }
                    }
                }