74 lines
3.1 KiB
Java
74 lines
3.1 KiB
Java
|
package eu.siacs.conversations.utils;
|
||
|
|
|
||
|
|
import android.util.Log;
|
||
|
|
|
||
|
|
import java.io.FileInputStream;
|
||
|
|
import java.io.FileOutputStream;
|
||
|
|
import java.io.IOException;
|
||
|
|
import java.security.InvalidKeyException;
|
||
|
|
import java.security.MessageDigest;
|
||
|
|
import java.security.NoSuchAlgorithmException;
|
||
|
|
import java.util.Arrays;
|
||
|
|
|
||
|
|
import javax.crypto.Cipher;
|
||
|
|
import javax.crypto.CipherInputStream;
|
||
|
|
import javax.crypto.CipherOutputStream;
|
||
|
|
import javax.crypto.NoSuchPaddingException;
|
||
|
|
import javax.crypto.spec.SecretKeySpec;
|
||
|
|
|
||
|
|
import eu.siacs.conversations.Config;
|
||
|
|
|
||
|
|
public class EncryptDecryptFile {
|
||
|
|
private static String cipher_mode = "AES/ECB/PKCS5Padding";
|
||
|
|
|
||
|
|
public static void encrypt(FileInputStream iFile, FileOutputStream oFile, String iKey) throws IOException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException {
|
||
|
|
byte[] key = iKey.getBytes("UTF-8");
|
||
|
|
Log.d(Config.LOGTAG, "Cipher key: " + Arrays.toString(key));
|
||
|
|
MessageDigest sha = MessageDigest.getInstance("SHA-1");
|
||
|
|
Log.d(Config.LOGTAG, "Cipher sha: " + sha.toString());
|
||
|
|
key = sha.digest(key);
|
||
|
|
Log.d(Config.LOGTAG, "Cipher sha key: " + Arrays.toString(key));
|
||
|
|
key = Arrays.copyOf(key, 16); // use only first 128 bit
|
||
|
|
Log.d(Config.LOGTAG, "Cipher sha key 16 bytes: " + Arrays.toString(key));
|
||
|
|
SecretKeySpec sks = new SecretKeySpec(key, "AES");
|
||
|
|
Cipher cipher = Cipher.getInstance(cipher_mode);
|
||
|
|
cipher.init(Cipher.ENCRYPT_MODE, sks);
|
||
|
|
Log.d(Config.LOGTAG, "Cipher IV: " + Arrays.toString(cipher.getIV()));
|
||
|
|
CipherOutputStream cos = new CipherOutputStream(oFile, cipher);
|
||
|
|
Log.d(Config.LOGTAG, "Encryption with: " + cos.toString());
|
||
|
|
int b;
|
||
|
|
byte[] d = new byte[8];
|
||
|
|
while ((b = iFile.read(d)) != -1) {
|
||
|
|
cos.write(d, 0, b);
|
||
|
|
}
|
||
|
|
cos.flush();
|
||
|
|
cos.close();
|
||
|
|
iFile.close();
|
||
|
|
}
|
||
|
|
|
||
|
|
public static void decrypt(FileInputStream iFile, FileOutputStream oFile, String iKey) throws IOException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException {
|
||
|
|
byte[] key = iKey.getBytes("UTF-8");
|
||
|
|
Log.d(Config.LOGTAG, "Cipher key: " + Arrays.toString(key));
|
||
|
|
MessageDigest sha = MessageDigest.getInstance("SHA-1");
|
||
|
|
Log.d(Config.LOGTAG, "Cipher sha: " + sha.toString());
|
||
|
|
key = sha.digest(key);
|
||
|
|
Log.d(Config.LOGTAG, "Cipher sha key: " + Arrays.toString(key));
|
||
|
|
key = Arrays.copyOf(key, 16); // use only first 128 bit
|
||
|
|
Log.d(Config.LOGTAG, "Cipher sha key 16 bytes: " + Arrays.toString(key));
|
||
|
|
SecretKeySpec sks = new SecretKeySpec(key, "AES");
|
||
|
|
Cipher cipher = Cipher.getInstance(cipher_mode);
|
||
|
|
cipher.init(Cipher.DECRYPT_MODE, sks);
|
||
|
|
Log.d(Config.LOGTAG, "Cipher IV: " + Arrays.toString(cipher.getIV()));
|
||
|
|
CipherInputStream cis = new CipherInputStream(iFile, cipher);
|
||
|
|
Log.d(Config.LOGTAG, "Decryption with: " + cis.toString());
|
||
|
|
int b;
|
||
|
|
byte[] d = new byte[8];
|
||
|
|
while ((b = cis.read(d)) != -1) {
|
||
|
|
oFile.write(d, 0, b);
|
||
|
|
}
|
||
|
|
oFile.flush();
|
||
|
|
oFile.close();
|
||
|
|
cis.close();
|
||
|
|
}
|
||
|
|
}
|