#include <Arduino.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>

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

const uint8_t Rcon[10] = {
    0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36
};
// Fungsi-fungsi untuk enkripsi AES
void SubBytes(uint8_t state[4][4]);
void ShiftRows(uint8_t state[4][4]);
void MixColumns(uint8_t state[4][4]);
void AddRoundKey(uint8_t state[4][4], uint8_t roundKey[4][4]);

// Fungsi-fungsi utilitas
void KeyExpansion(uint8_t roundKeys[176], const uint8_t cipherKey[16]);
void PrintState(const char *label, const uint8_t state[4][4]);
void PrintRoundKey(const char *label, const uint8_t roundKey[4][4]);

void setup() {
  Serial.begin(9600);
    // Inisialisasi teks terang dan kunci
    uint8_t plaintext[16] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
    uint8_t key[16] = {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f};

    // Menampilkan plaintext dan kunci awal
    Serial.print("709-Ptx: ");
    for (int i = 0; i < 16; i++) {
        Serial.print(plaintext[i], HEX);
    }
    Serial.println();

    Serial.print("709-key: ");
    for (int i = 0; i < 16; i++) {
        Serial.print(key[i], HEX);
    }
    Serial.println();

    // Inisialisasi state awal
    uint8_t state[4][4];
   memcpy(state, plaintext, 16 * sizeof(uint8_t));

    // Menampilkan state awal
    PrintState("709-awal[0]", state);

    // Inisialisasi round keys
    uint8_t roundKeys[176];
    KeyExpansion(roundKeys, key);

    // Enkripsi AES 128
    for (int round = 1; round <= 10; round++) {
        // SubBytes
        SubBytes(state);
        PrintState("709-Sbytes", state);

        // ShiftRows
        ShiftRows(state);
        PrintState("709-Srow", state);

        // MixColumns (kecuali di round ke-10)
        if (round < 10) {
            MixColumns(state);
            PrintState("709-Mcol", state);
        }

        // AddRoundKey
        uint8_t roundKey[4][4];
        memcpy(roundKey, roundKeys + round * 16, 16 * sizeof(uint8_t));
        AddRoundKey(state, roundKey);
        PrintRoundKey("709-keysch", roundKey);

        // Menampilkan state pada round ke-10
        if (round == 10) {
            PrintState("709-awal[10]", state);
            PrintState("709-Sbytes[10]", state);
            PrintState("709-Srow[10]", state);
            PrintRoundKey("709-keysch[10]", roundKey);
        }
    }

    // Menampilkan ciphertext
    Serial.print("NPM-Ctx: ");
    for (int i = 0; i < 16; i++) {
        Serial.print(state[0][i], HEX);
    }
    Serial.println();
}

void loop() {
  // your code here
}

void PrintState(const char *label, const uint8_t state[4][4]) {
    Serial.print(label);
    Serial.print(": ");
    for (int col = 0; col < 4; col++) {
        for (int row = 0; row < 4; row++) {
            Serial.print(state[row][col], HEX);
        }
    }
    Serial.println();
}

void PrintRoundKey(const char *label, const uint8_t roundKey[4][4]) {
    Serial.print(label);
    Serial.print(": ");
    for (int col = 0; col < 4; col++) {
        for (int row = 0; row < 4; row++) {
            Serial.print(roundKey[row][col], HEX);
        }
    }
    Serial.println();
}

void SubBytes(uint8_t state[4][4]) {
    for (int i = 0; i < 4; i++) {
        for (int j = 0; j < 4; j++) {
            if (state[i][j] >= 0 && state[i][j] < 256) {
                state[i][j] = sBox[state[i][j]];
            } else {
                // Handle error or exit the function
            }
        }
    }
}


void ShiftRows(uint8_t state[4][4]) {
    // Menggeser baris ke-1 satu langkah ke kiri
    uint8_t temp = state[1][0];
    state[1][0] = state[1][1];
    state[1][1] = state[1][2];
    state[1][2] = state[1][3];
    state[1][3] = temp;

    // Menggeser baris ke-2 dua langkah ke kiri
    temp = state[2][0];
    state[2][0] = state[2][2];
    state[2][2] = temp;
    temp = state[2][1];
    state[2][1] = state[2][3];
    state[2][3] = temp;

    // Menggeser baris ke-3 tiga langkah ke kiri
    temp = state[3][0];
    state[3][0] = state[3][3];
    state[3][3] = state[3][2];
    state[3][2] = state[3][1];
    state[3][1] = temp;
}


void MixColumns(uint8_t state[4][4]) {
    for (int col = 0; col < 4; col++) {
        uint8_t s0 = state[0][col];
        uint8_t s1 = state[1][col];
        uint8_t s2 = state[2][col];
        uint8_t s3 = state[3][col];

        state[0][col] = Multiply(s0, 0x02) ^ Multiply(s1, 0x03) ^ s2 ^ s3;
        state[1][col] = s0 ^ Multiply(s1, 0x02) ^ Multiply(s2, 0x03) ^ s3;
        state[2][col] = s0 ^ s1 ^ Multiply(s2, 0x02) ^ Multiply(s3, 0x03);
        state[3][col] = Multiply(s0, 0x03) ^ s1 ^ s2 ^ Multiply(s3, 0x02);
    }
}

// Fungsi untuk perkalian dalam Galois Field
uint8_t Multiply(uint8_t a, uint8_t b) {
    uint8_t result = 0;
    uint8_t mask = 0x01;

    for (int i = 0; i < 8; i++) {
        if (b & mask) {
            result ^= a;
        }

        // Operasi shift kiri pada a
        uint8_t high_bit_set = a & 0x80;
        a <<= 1;

        // Jika high bit diatur, lakukan XOR dengan polinomial irreducible
        if (high_bit_set) {
            a ^= 0x1B;  // Polinomial irreducible: x^8 + x^4 + x^3 + x + 1
        }

        mask <<= 1;
    }

    return result;
}


void AddRoundKey(uint8_t state[4][4], uint8_t roundKey[4][4]) {
    for (int col = 0; col < 4; col++) {
        for (int row = 0; row < 4; row++) {
            state[row][col] ^= roundKey[row][col];
        }
    }
}


void KeyExpansion(uint8_t roundKeys[176], const uint8_t cipherKey[16]) {
    const int Nk = 4;  // Jumlah kata kunci
    const int Nb = 4;  // Jumlah kolom dalam state
    const int Nr = 10; // Jumlah round

    // Copy kunci awal ke roundKeys
    memcpy(roundKeys, cipherKey, 16);

    // Inisialisasi variabel temp untuk word ke-4
    uint8_t temp[4];

    // Mulai ekspansi kunci
    for (int i = Nk; i < Nb * (Nr + 1); i++) {
        // Ambil word ke-(i-1)
        memcpy(temp, roundKeys + (i - 1) * 4, 4);

        if (i % Nk == 0) {
            // RotWord
            uint8_t tempByte = temp[0];
            temp[0] = temp[1];
            temp[1] = temp[2];
            temp[2] = temp[3];
            temp[3] = tempByte;

            // SubWord
            for (int j = 0; j < 4; j++) {
                temp[j] = sBox[temp[j]];
            }

            // XOR dengan Rcon
            temp[0] ^= Rcon[i / Nk - 1];
        } else if (Nk > 6 && i % Nk == 4) {
            // SubWord pada kunci jangka panjang (Nk > 6)
            for (int j = 0; j < 4; j++) {
                temp[j] = sBox[temp[j]];
            }
        }

        // XOR dengan word ke-(i-Nk)
        for (int j = 0; j < 4; j++) {
            roundKeys[i * 4 + j] = roundKeys[(i - Nk) * 4 + j] ^ temp[j];
        }
    }
}