Secure C Chat Client

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <openssl/aes.h>
#include <openssl/rand.h>

#define MAX_BUF_SIZE 1073741824
#define AES_BLOCK_SIZE 16

typedef struct CryptoClient {
    char IP[50];
    int PORT;
    char EncryptKeyXOR[100];
    char EncryptKeyAES[100];

    // Function pointers
    char* (*pad)(struct CryptoClient *client, char *s);
    char* (*unpad)(struct CryptoClient *client, char *s);
    char* (*encryptAES)(struct CryptoClient *client, char *raw);
    char* (*decryptAES)(struct CryptoClient *client, char *enc);
    char* (*XOR)(struct CryptoClient *client, char *securekey, char *data, int mode);
    char* (*encryptMSG)(struct CryptoClient *client, char *data);
    char* (*decryptMSG)(struct CryptoClient *client, char *data);
    void (*sendMSG)(struct CryptoClient *client);
    void (*sendFILE)(struct CryptoClient *client, char *file_);
    char* (*randStr)(struct CryptoClient *client, int length);
    void (*recvMSG)(struct CryptoClient *client);
} CryptoClient;

// Function implementations
char* pad(struct CryptoClient *client, char *s) {
    int padLength = 16 - (strlen(s) % 16);
    char *padding = malloc(padLength + 1);
    memset(padding, padLength, padLength);
    padding[padLength] = '\0';
    strcat(s, padding);
    return s;
}

char* unpad(struct CryptoClient *client, char *s) {
    int length = strlen(s);
    int padValue = s[length - 1];
    s[length - padValue] = '\0';
    return s;
}

char* encryptAES(struct CryptoClient *client, char *raw) {
    // Implement AES encryption logic
    return raw;
}

char* decryptAES(struct CryptoClient *client, char *enc) {
    // Implement AES decryption logic
    return enc;
}

char* XOR(struct CryptoClient *client, char *securekey, char *data, int mode) {
    // Implement XOR operation logic
    return data;
}

char* encryptMSG(struct CryptoClient *client, char *data) {
    char* encryptedXOR = XOR(client, client->EncryptKeyXOR, data, 0);
    char* encryptedAES = encryptAES(client, encryptedXOR);
    return encryptedAES;
}

char* decryptMSG(struct CryptoClient *client, char *data) {
    char* decryptedAES = decryptAES(client, data);
    char* decryptedXOR = XOR(client, client->EncryptKeyXOR, decryptedAES, 1);
    return decryptedXOR;
}

void sendMSG(struct CryptoClient *client) {
    // Implement message sending logic
}

void sendFILE(struct CryptoClient *client, char *file_) {
    // Implement file sending logic
}

char* randStr(struct CryptoClient *client, int length) {
    // Implement random string generation logic
    return "randomString"; // Replace this with actual random string generation
}

void recvMSG(struct CryptoClient *client) {
    // Implement message receiving logic
}

int main() {
    CryptoClient client;
    // Initialize client and other setup logic...

    // Example usage
    char message[] = "Hey, Suck My Dick VX Underground You can't Even Encrypt Data.";
    char* encrypted = encryptMSG(&client, message);
    printf("Encrypted Message: %s\n", encrypted);

    char* decrypted = decryptMSG(&client, encrypted);
    printf("Decrypted Message: %s\n", decrypted);

    return 0;
}