I want to decrypt file with extention .txt .docx .xlsx and .pdf from uploading file.
encrypt.php
<?php
include "koneksi.php";
function generateKeyPairFromFileName(){
$config = array(
"default_md" => "sha512",
"private_key_bits" => 512,
"private_key_type" => OPENSSL_KEYTYPE_RSA,
);
$keypair = openssl_pkey_new($config);
if (!$keypair) {
die("Failed to generate key pair");
}
openssl_pkey_export($keypair, $privateKey, null, $config);
$publicKey = openssl_pkey_get_details($keypair);
$publicKey = $publicKey['key'];
return array(
'publicKey' => $publicKey,
'privateKey' => $privateKey
);
}
function savePublicKeyToLocal($publicKey, $fileName) {
$publicKeyPath = $fileName . '_public_key.pem'; // Ganti dengan lokasi penyimpanan kunci publik Anda
file_put_contents($publicKeyPath, $publicKey);
return $publicKeyPath;
}
// Fungsi untuk menyimpan kunci pribadi ke file lokal
function savePrivateKeyToLocal($privateKey, $fileName) {
$privateKeyPath = $fileName . '_private_key.pem'; // Ganti dengan lokasi penyimpanan kunci pribadi Anda
file_put_contents($privateKeyPath, $privateKey);
return $privateKeyPath;
}
// Fungsi untuk mengenkripsi file menggunakan AES
function encryptFile($data, $key) {
// Buat vektor inisialisasi (IV) acak
$iv = openssl_random_pseudo_bytes(16);
// Enkripsi data menggunakan AES-256-CBC dengan kunci dan IV yang diberikan
$encryptedData = openssl_encrypt($data, 'aes-256-cbc', $key, OPENSSL_RAW_DATA, $iv);
// Base64 encode hasil enkripsi
$encryptedDataBase64 = base64_encode($encryptedData);
// Simpan atau kirim data terenkripsi ke tempat penyimpanan atau penerima
// echo "Data terenkripsi: " . $encryptedDataBase64;
return $encryptedDataBase64;
}
if(isset($_POST['generate'])){
$uploadedFileName = $_FILES['file']['name'];
$filetmp = $_FILES['file']['tmp_name'];
// Membaca isi file
$fileContent = file_get_contents($filetmp);
$KeyPair = generateKeyPairFromFileName();
$publicKeyPath = savePublicKeyToLocal($KeyPair['publicKey'], $uploadedFileName);
$publicKeyPath = savePrivateKeyToLocal($KeyPair['privateKey'], $uploadedFileName);
$encryptedFileContent = encryptFile($fileContent, $KeyPair['publicKey']);
// echo $encryptedFileContent;
$query = "INSERT INTO upload (nama_file, filedata) VALUES ('$uploadedFileName', '$encryptedFileContent')";
if (mysqli_query($conn, $query)) {
echo "File berhasil diunggah dan dienkripsi.";
} else {
echo "Gagal mengunggah dan menyimpan file ke database: " . mysqli_error($conn);
}
}
?>
<form action="" method="post" enctype="multipart/form-data">
Pilih file untuk diunggah (PDF, DOCX, XLSX, TXT, maks 15 MB):
<input type="file" name="file">
<button name="generate" type="submit">Generate</button>
</form>
I save the private and public key on local. The script above is for encrypt data before save on the database.
ecnrypt.php
<?php
error_reporting(E_ALL);
ini_set('display_errors', 1);
include "koneksi.php";
// Fungsi dekripsi
function decryptFile($data, $key) {
// Decode data terenkripsi dari base64
$encryptedData = base64_decode($data);
// Ambil IV dari data terenkripsi
$iv = openssl_random_pseudo_bytes(16);
$decryptedData = openssl_decrypt($encryptedData, 'aes-256-cbc', $key, OPENSSL_RAW_DATA, $iv);
// Kembalikan data yang telah didekripsi
return $decryptedData;
}
if(isset($_GET['nama_file'])){
// Nama file
$fileName = $_GET['nama_file'];
// Membaca kunci privat
try {
$privateKeyPath = $fileName . '_private_key.pem';
if (!file_exists($privateKeyPath)) {
throw new Exception("File kunci privat tidak ditemukan: " . $privateKeyPath);
}
$privateKey = file_get_contents($privateKeyPath);
} catch (Exception $e) {
echo "Gagal membaca kunci privat: " . $e->getMessage();
exit;
}
// Mengambil data file terenkripsi dari database
$query = "SELECT filedata FROM upload WHERE nama_file = '$fileName'";
$result = mysqli_query($conn, $query);
if ($result && mysqli_num_rows($result) > 0) {
$row = mysqli_fetch_assoc($result);
// Dekripsi data
$decryptedData = decryptFile($row['filedata'], $privateKey);
// Tampilkan data yang telah didekripsi
echo $decryptedData;
} else {
echo "File tidak ditemukan!";
}
}
The file that i want to decrypt is empty. i mean return empty on decrypted data. is anyone have same problem ?
Expecting file with decrypted data.
