Develop Reference

Java - BouncyCastle - 3DES encryption and decryption of files: Files are corrupted after round trip

I am trying to encrypt and decrypt files with BouncyCastle 3DES. But the files are corrupted after encrypting and decrypting. For example a simple text-file or a jpg-image-file. This is my Code:
ZipUnzipBouncyCastle()
{
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
}
public void encrypt3DES(String password, String file)
throws IOException, DataLengthException, IllegalStateException,
InvalidCipherTextException, NoSuchAlgorithmException
{
byte[] data = Files.readAllBytes(new File(file).toPath());
SecureRandom random = new SecureRandom(data);
KeyGenerator keyGenerator = KeyGenerator.getInstance("DESede");
keyGenerator.init(168, random);
SecretKey secreteKey = keyGenerator.generateKey();
BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(
new CBCBlockCipher(new DESedeEngine()));
cipher.init(true, new KeyParameter(secreteKey.getEncoded()));
byte[] result = new byte[cipher.getOutputSize(data.length)];
int tam = cipher.processBytes(data, 0, data.length, result, 0);
cipher.doFinal(result, tam);
byte[] encodedData = Base64.getEncoder().encode(result);
FileOutputStream fileOutputStream = new FileOutputStream(file);
fileOutputStream.write(encodedData);
fileOutputStream.flush();
fileOutputStream.close();
}
public void decrypt3DES(String password, String file)
throws NoSuchAlgorithmException, DataLengthException,
IllegalStateException, InvalidCipherTextException, IOException
{
byte[] data = Files.readAllBytes(new File(file).toPath());
byte[] decodedData = Base64.getDecoder().decode(data);
SecureRandom random = new SecureRandom(decodedData);
KeyGenerator keyGenerator = KeyGenerator.getInstance("DESede");
keyGenerator.init(168, random);
SecretKey secreteKey = keyGenerator.generateKey();
BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(
new CBCBlockCipher(new DESedeEngine()));
cipher.init(true, new KeyParameter(secreteKey.getEncoded()));
byte[] result = new byte[cipher.getOutputSize(decodedData.length)];
int tam = cipher.processBytes(decodedData, 0, decodedData.length, result, 0);
cipher.doFinal(result, tam);
FileOutputStream fileOutputStream = new FileOutputStream(file);
fileOutputStream.write(result);
fileOutputStream.flush();
fileOutputStream.close();
}
I looked all over the Internet but could not find any explanation. What am I doing wrong?

Decrypt Video File and save to internal storage

I have an encrypted video with the key and I want to decrypt that video file with Key but I am not able to decrypt the video file. I try 2 3 methods but Non of these works for me.
Crypto.Class
public class Crypto {
static void fileProcessor(int cipherMode,String key,File inputFile,File outputFile){
try {
KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
SecureRandom secureRandom = new SecureRandom();
secureRandom.setSeed(key.getBytes("UTF-8"));
keyGenerator.init(128, secureRandom);
SecretKey secretKey = keyGenerator.generateKey();
// Key secretKey = new SecretKeySpec(key.getBytes(), "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(cipherMode, secretKey);
FileInputStream inputStream = null;
byte[] inputBytes = new byte[0];
try {
inputStream = new FileInputStream(inputFile);
inputBytes = new byte[(int) inputFile.length()];
inputStream.read(inputBytes);
} catch (IOException e) {
e.printStackTrace();
}
byte[] outputBytes = cipher.doFinal(inputBytes);
FileOutputStream outputStream = new FileOutputStream(outputFile);
outputStream.write(outputBytes);
inputStream.close();
outputStream.close();
} catch (NoSuchPaddingException | NoSuchAlgorithmException
| InvalidKeyException | BadPaddingException
| IllegalBlockSizeException | IOException e) {
e.printStackTrace();
}
}
public static String Decrypt(String filePath) {
String key = "my_encrypted_key";
// File inputFile = new File("text.txt");
File encryptedFile = new File(filePath);
String decryptedFilePath="";
//check special guid folder if not exist create
//get the selected video file path with settings path if exist decrypt if not exist show message
File decryptedFile = new File(decryptedFilePath);
try {
//Crypto.fileProcessor(Cipher.ENCRYPT_MODE,key,inputFile,encryptedFile);
Crypto.fileProcessor(Cipher.DECRYPT_MODE,key,encryptedFile,decryptedFile);
Log.d("success", "Decrypt: success");
return decryptedFile.getAbsolutePath();
} catch (Exception ex) {
System.out.println(ex.getMessage());
ex.printStackTrace();
}
return "";
}
}
But this does not work for me and I try another one.
public static void TEST2(String orgFile) {
try {
String password = "estudies741852963#123";
File outFile_dec = new File(Environment.getExternalStorageDirectory()+"/testVideo/abc.mp4");
if(!outFile_dec.isDirectory()) {
outFile_dec.mkdir();
}
if(!outFile_dec.exists()){
outFile_dec.createNewFile();
}
// reading the salt
// user should have secure mechanism to transfer the
// salt, iv and password to the recipient
FileInputStream saltFis = new FileInputStream(orgFile);
byte[] salt = new byte[8];
saltFis.read(salt);
saltFis.close();
// reading the iv
FileInputStream ivFis = new FileInputStream(orgFile);
byte[] iv = new byte[16];
ivFis.read(iv);
ivFis.close();
SecretKeyFactory factory = SecretKeyFactory
.getInstance("PBKDF2WithHmacSHA1");
KeySpec keySpec = new PBEKeySpec(password.toCharArray(), salt, 1000,
256);
SecretKey tmp = factory.generateSecret(keySpec);
SecretKey secret = new SecretKeySpec(tmp.getEncoded(), "AES");
// file decryption
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, secret, new IvParameterSpec(iv));
InputStream fis = new FileInputStream(orgFile);
OutputStream fos = new FileOutputStream(outFile_dec);
// byte[] in = new byte[1024];
// int read;
// while ((read = fis.read(in)) != -1) {
// byte[] output = cipher.update(in, 0, read);
// if (output != null)
// fos.write(output);
// }
//
// byte[] output = cipher.doFinal();
// if (output != null)
// fos.write(output);
// fis.close();
// fos.flush();
// fos.close();
// System.out.println("File Decrypted.");
fos = new CipherOutputStream(fos, cipher);
int count = 0;
byte[] buffer = new byte[1024];
while ((count = fis.read(buffer)) >= 0) {
fos.write(buffer, 0, count);
}
fis.close();
fos.flush();
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
}
In this method, its always shows on exception saying no such directory. And I try another method also But none of these works for me.
Tried this solution to decrypt my video
Java 256-bit AES Password-Based Encryption
How do i decrypt a file in Android with AES?

Encrypting and decrypting a file using CipherInputStream and CipherOutputStream

I've been trying to write an encrypted file in AES and decrypt it subsequently by using Cipher Streams provided in JCA. However, I'm having problems while reading the file, as the decryption is going haywire.
public class CipherStreams {
public static void main(String[] args) {
try {
KeyGenerator keygen = KeyGenerator.getInstance("AES");
Key k = keygen.generateKey();
Cipher aes = Cipher.getInstance("AES/ECB/PKCS5Padding");
aes.init(Cipher.ENCRYPT_MODE, k);
FileOutputStream fs = new FileOutputStream("Encrypyed.txt");
CipherOutputStream out = new CipherOutputStream(fs, aes);
out.write("[Hello:Okay]\nOkay".getBytes());
out.close();
Cipher aes2 = Cipher.getInstance("AES/ECB/PKCS5Padding");
aes2.init(Cipher.DECRYPT_MODE, k);
FileInputStream fis = new FileInputStream("Encrypyed.txt");
CipherInputStream in = new CipherInputStream(fis,aes2);
byte[] b = new byte[8];
int i = in.read(b);
while(i!=-1) {
System.out.print((char)i);
i = in.read(b);
}
} catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException | IOException ex) {
Logger.getLogger(CipherStreams.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
I'm receiving a single byte output as 5. Can anyone please help point out the problem?

You're not writing the bytes read, you're writing the number of bytes being read.
You're also assuming that the default platform encoding just transforms each character to a byte.
Just do the reverse of what you did when writing: read everything, and transform the read byte array to a String, then print that string:
public class CipherStreams {
public static void main(String[] args) {
try {
KeyGenerator keygen = KeyGenerator.getInstance("AES");
Key k = keygen.generateKey();
Cipher aes = Cipher.getInstance("AES/ECB/PKCS5Padding");
aes.init(Cipher.ENCRYPT_MODE, k);
String fileName = "Encrypted.txt";
FileOutputStream fs = new FileOutputStream(fileName);
CipherOutputStream out = new CipherOutputStream(fs, aes);
out.write("[Hello:Okay]\nOkay".getBytes());
out.flush();
out.close();
Cipher aes2 = Cipher.getInstance("AES/ECB/PKCS5Padding");
aes2.init(Cipher.DECRYPT_MODE, k);
FileInputStream fis = new FileInputStream(fileName);
CipherInputStream in = new CipherInputStream(fis, aes2);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] b = new byte[1024];
int numberOfBytedRead;
while ((numberOfBytedRead = in.read(b)) >= 0) {
baos.write(b, 0, numberOfBytedRead);
}
System.out.println(new String(baos.toByteArray()));
}
catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException | IOException ex) {
ex.printStackTrace();
;
}
}
}

How to store a secretKey in database postgresql and retrieve it

I tried convert it to byte[] and store it on a bytea but it didn't work, i don't receive the same secretkey that i stored. Using type String didn't work as well
if you're interested in more details, my application is to crypt and decrypt pictures using AES and these are methods to crypt and decrypt
public void crypt() throws NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException, InvalidKeyException, IOException{
Cipher cipher = Cipher.getInstance("AES");
KeyGenerator keyGen = KeyGenerator.getInstance("AES");
SecretKey secKey = keyGen.generateKey();
byte[] encoded = secKey.getEncoded();
this.setCodeCrypt(encoded);
cipher.init(Cipher.ENCRYPT_MODE, secKey);
String cleartextFile = this.lien;
String ciphertextFile = "crypted img.jpg";
FileInputStream fis = new FileInputStream(cleartextFile);
FileOutputStream fos = new FileOutputStream(ciphertextFile);
CipherOutputStream cos = new CipherOutputStream(fos, cipher);
int i;
while ((i = fis.read()) != -1) {
cos.write(i);
}
cos.close();
}
// Decrypt
public void decrypt() throws NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException, InvalidKeyException, IOException{
try {
Class.forName("org.postgresql.Driver");
String url = "jdbc:postgresql://localhost:5432/papiersadmin";
String user = "postgres";
String passwd = "postgresql";
java.sql.Connection conn = DriverManager.getConnection(url, user,passwd);
Statement state = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
// loading a picture knowing its path (lien)
ResultSet result = state.executeQuery("SELECT * FROM image WHERE lien = '"+this.lien+"'");
while(result.next()){
setCodeCrypt(result.getObject(6).toString().getBytes());}
state.close();
} catch (Exception e) {
e.printStackTrace();
}
Cipher cipher = Cipher.getInstance("AES");
SecretKey originalKey = new SecretKeySpec(codeCrypt, 0, codeCrypt.length, "AES");
cipher.init(Cipher.DECRYPT_MODE, originalKey);
String cleartextFile = "decrypted img.jpg";
String ciphertextFile = this.lien;
FileInputStream fis = new FileInputStream(ciphertextFile);
FileOutputStream fos = new FileOutputStream(cleartextFile);
CipherOutputStream cos = new CipherOutputStream(fos, cipher);
int i;
while ((i = fis.read()) != -1) {
cos.write(i);
}
cos.close();
}

Converting a byte[] to a String using toString() and then calling getBytes() will not do anything useful. I would suggest starting with ResultSet.getBytes().

Whatsapp database decryption on Android

I'd like to write an Android Application which automatically decrypts my Whatsapp Database, so I followed this tutorial and translated it into Java. But then I noticed that there is no openssl binary on Android so I asked google how to decrypt aes manually but I could not find something useful.
So basically I got this shell command
openssl enc -aes-256-cbc -d -nosalt -nopad -bufsize 16384 -in msgstore.db.crypt7.nohdr -K $k -iv $iv > msgstore.db
with $k being a 64 digit hex-string. But when I tried to use it as the key for the aes decryption I get an InvalidKeyException with the message "Unsupported key size: 64 bytes".
When I execute this command at my computer I works perfectly.
I am currently using this java code to decrypt the database and it fails at cipher.init:
public void decryptDatabase(String k, String iv)
throws InvalidKeyException, InvalidAlgorithmParameterException,
NoSuchAlgorithmException, NoSuchPaddingException, IOException {
File extStore = Environment.getExternalStorageDirectory();
FileInputStream fis = new FileInputStream(extStore
+ "/WhatsApp/Databases/msgstore.db.crypt7.nohdr");
FileOutputStream fos = new FileOutputStream(extStore + "/Decrypted.db");
SecretKeySpec sks = new SecretKeySpec(k.getBytes(), "AES");
Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
cipher.init(Cipher.DECRYPT_MODE, sks,
new IvParameterSpec(iv.getBytes()));
CipherInputStream cis = new CipherInputStream(fis, cipher);
int b;
byte[] d = new byte[8];
while ((b = cis.read(d)) != -1) {
fos.write(d, 0, b);
}
fos.flush();
fos.close();
cis.close();
}
Please help me if you can :)
Thanks in advance, Citron

You need to convert the hex strings to byte arrays properly:
private static byte[] hexStringToByteArray(String s) {
int len = s.length();
byte[] data = new byte[len / 2];
for (int i = 0; i < len; i += 2) {
data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4)
+ Character.digit(s.charAt(i+1), 16));
}
return data;
}
public void decryptDatabase(String k, String iv) throws InvalidKeyException, InvalidAlgorithmParameterException,
NoSuchAlgorithmException, NoSuchPaddingException, IOException {
File extStore = Environment.getExternalStorageDirectory();
FileInputStream fis = new FileInputStream(extStore
+ "/WhatsApp/Databases/msgstore.db.crypt7.nohdr");
FileOutputStream fos = new FileOutputStream(extStore + "/Decrypted.db");
SecretKeySpec sks = new SecretKeySpec(hexStringToByteArray(k), "AES");
Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
cipher.init(Cipher.DECRYPT_MODE, sks,
new IvParameterSpec(hexStringToByteArray(iv)));
CipherInputStream cis = new CipherInputStream(fis, cipher);
int b;
byte[] d = new byte[8];
while ((b = cis.read(d)) != -1) {
fos.write(d, 0, b);
}
fos.flush();
fos.close();
cis.close();
}