#define Nb 4
#define Nk 4
#define Nr 11

uint8_t bentar[4][4];
uint8_t w[Nb * (Nr + 1) * 4];
uint8_t kunci[11][4][4];

uint8_t state[4][4] = {
    {0x32, 0x88, 0x31, 0xe0},
    {0x43, 0x5a, 0x31, 0x37},
    {0xf6, 0x30, 0x98, 0x07},
    {0xa8, 0x8d, 0xa2, 0x34}};

uint8_t key[Nk * 4] = {0x2b, 0x7e, 0x15, 0x16,
                       0x28, 0xae, 0xd2, 0xa6,
                       0xab, 0xf7, 0x15, 0x88,
                       0x09, 0xcf, 0x4f, 0x3c};

uint8_t mix_matrix[4][4] = {{2, 3, 1, 1}, // define row and column
                            {1, 2, 3, 1},
                            {1, 1, 2, 3},
                            {3, 1, 1, 2}};

uint8_t sbox[256] = {
    /*  0    1    2    3    4    5    6    7    8    9    a    b    c    d    e    f */
    0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76, /*0*/
    0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, /*1*/
    0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15, /*2*/
    0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75, /*3*/
    0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84, /*4*/
    0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf, /*5*/
    0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8, /*6*/
    0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, /*7*/
    0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73, /*8*/
    0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb, /*9*/
    0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, /*a*/
    0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08, /*b*/
    0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a, /*c*/
    0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, /*d*/
    0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf, /*e*/
    0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16  /*f*/
};                                                                                                  // tabel sbox

const uint8_t Rcon[11] = {0x00, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36};

void Subbytes(uint8_t state[4][4])
{
Serial.println("State : ");
    for (int i = 0; i < 4; i++)
    { // ubah nilai i ke sbox j=0, looping hingga i=4
        for (int j = 0; j < 4; j++)
        {  // ubah nilai i ke sbox j=0, looping hingga i=4
            state[i][j] = sbox[state[i][j]]; // write Ptx(i,j)=sbox_out
            Serial.print(state[i][j], HEX);  // sbox_out
            Serial.print(" ");
        } // end (menampilkan hasil subbytes)
        Serial.println();
    }
}

void ShiftRows(uint8_t state[4][4])
{
    Serial.println("before shiftrow");
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
Serial.print(state[i][j], HEX);
Serial.print(" ");
}
Serial.println();
}
Serial.println();
Serial.println("after shiftrow");
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
bentar[i][j] = state[i][(j+i) % 4];
}
for (int k = 0; k < 4; k++) {
state[i][k] = bentar[i][k];
Serial.print(state[i][k], HEX);
            Serial.print(" ");
        }
        Serial.println();
    }
}


void mixColumns(uint8_t state[4][4])
{ // Perhitungan
    uint8_t temp[4];
    for (int i = 0; i < 4; i++)
    {
        for (int j = 0; j < 4; j++)
        {
            temp[j] = 0;
            for (int k = 0; k < 4; k++)
            {
                temp[j] ^= GF2(mix_matrix[j][k], state[k][i]);
            }
        }
        for (int j = 0; j < 4; j++)
        {
            state[j][i] = temp[j];
        }
    }
    Serial.println("Mix Columns Input:");
    for (int i = 0; i < 4; i++)
    { // define result
        for (int j = 0; j < 4; j++)
        {
            if (state[i][j] < 16)
            {
                Serial.print("0");
            }
            Serial.print(state[i][j], HEX);
            Serial.print(" "); // result
        }
        Serial.println();
    }
}
uint8_t GF2(uint8_t a, uint8_t b)
{ // modulus 2^8
    uint8_t result = 0;

    while (b > 0)
    {
        if (b & 1)
        {
            result ^= a;
        }
        a = (a << 1) ^ ((a & 0x80) ? 0x1B : 0x00);
        b >>= 1;
    }
    return result;
}

void AddRoundKey(uint8_t state[4][4], uint8_t key[4][4])
{
    for (int i = 0; i < 4; i++)
    {
        for (int j = 0; j < 4; j++)
        {
            state[i][j] = state[i][j] ^ key[i][j];
        }
    }
}

void KeyExpansion(uint8_t key[Nk * 4], uint8_t w[Nb * (Nr + 1) * 4])
{
  // Serial.println("Key Expansion: ");
    const uint8_t Rcon[11] = {0x00, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36};
    int i, j;
    uint8_t temp[4], k;

    for (i = 0; i < Nk; i++)
    {
        for (j = 0; j < 4; j++)
        {
            w[i * 4 + j] = key[i * 4 + j];
        }
    }

    for (i = Nk; i < Nb * (Nr + 1); i++)
    {
        for (j = 0; j < 4; j++)
        {
            temp[j] = w[(i - 1) * 4 + j];
        }
        if (i % Nk == 0)
        {
            // rotasi 4 byte
            uint8_t t = temp[0];
            temp[0] = temp[1];
            temp[1] = temp[2];
            temp[2] = temp[3];
            temp[3] = t;

            // Subtitusi dengan sbox
            for (j = 0; j < 4; j++)
            {
                temp[j] = getSBoxValue(temp[j]);
            }

            temp[0] = temp[0] ^ Rcon[i / Nk];
        }
        for (j = 0; j < 4; j++)
        {
            w[i * 4 + j] = w[(i - Nk) * 4 + j] ^ temp[j];
        }
    }
        //transpose dan ubah array
        for (int i = 0; i < 11; i++)
        {
            for (int j = 0; j < 4; j++)
            {
                for (int k = 0; k < 4; k++)
                {
                    kunci[i][k][j] = w[i * 16 + j * 4 + k];
                }
            }
        }
}

uint8_t getSBoxValue(uint8_t num)
{
    return sbox[num];
}

void keyexpansion(uint8_t state[4][4]){
    Serial.println("Round Key Value: ");
        for (int i = 0; i < 4; i++)
        {
            for (int j = 0; j < 4; j++)
            {
                Serial.print(state[i][j], HEX);
                Serial.print(" ");
            }
            Serial.println();
        }
    Serial.println();
}

void setup()
{
    Serial.begin(9600);

    Serial.println("AES ENCRYPTION");
    Serial.println("START OF ROUND");
    for (int i = 0; i < 4; i++)
    {
        for (int j = 0; j < 4; j++)
        {
            Serial.print(state[i][j], HEX);
            Serial.print(" ");
        }
        Serial.println("");
    }

    int JumlahROUND = 9;

    KeyExpansion(key, w);

    Serial.println("\nROUND KEY VALUE");
    keyexpansion(kunci[0]);
    Serial.println("\n     ROUND 1 ");
    Serial.println("\nSTART OF ROUND");
    AddRoundKey(state, kunci[0]);
    for (int i = 0; i < 4; i++)
    {
        for (int j = 0; j < 4; j++)
        {
            Serial.print(state[i][j], HEX);
            Serial.print(" ");
        }
        Serial.println("");
    }

    for (int i = 0; i <= JumlahROUND; i++)
    {
        Serial.println("\nAFTER SUBBYTES:");
        Subbytes(state);
        Serial.println("\nAFTER SHIFTROWS:");
        ShiftRows(state);
        if (i < JumlahROUND)
        {
            Serial.println("\nAFTER MIXCOLUMN");
            mixColumns(state);
            Serial.println("\nROUND KEY VALUE");
            keyexpansion(kunci[i + 1]);
            Serial.print("\n   ROUND ");
            Serial.print(i + 2);
            Serial.print("       ");
            Serial.println("\nSTART OF ROUND");
        }
        AddRoundKey(state, kunci[i + 1]);
    }
    Serial.println("ROUND KEY VALUE");
    keyexpansion(kunci[10]);
    Serial.println("OUTPUT");
    for (int i = 0; i < 4; i++)
    {
        for (int j = 0; j < 4; j++)
        {
            Serial.print(state[i][j], HEX);
            Serial.print(" ");
        }
        Serial.println("");
    }
}

void loop()
{
    // put your main code here, to run repeatedly:
}