CnrM1d5B

1public class CryptoUtils {
2    private static final String ALGORITHM = "AES";
3    private static final String TRANSFORMATION = "AES";
4 
5    public static void encrypt(String key, File inputFile, File outputFile)
6            throws CryptoException {
7        doCrypto(Cipher.ENCRYPT_MODE, key, inputFile, outputFile);
8    }
9 
10    public static void decrypt(String key, File inputFile, File outputFile)
11            throws CryptoException {
12        doCrypto(Cipher.DECRYPT_MODE, key, inputFile, outputFile);
13    }
14 
15    private static void doCrypto(int cipherMode, String key, File inputFile,
16            File outputFile) throws CryptoException {
17        try {
18            Key secretKey = new SecretKeySpec(key.getBytes(), ALGORITHM);
19            Cipher cipher = Cipher.getInstance(TRANSFORMATION);
20            cipher.init(cipherMode, secretKey);
21             
22            FileInputStream inputStream = new FileInputStream(inputFile);
23            byte[] inputBytes = new byte[(int) inputFile.length()];
24            inputStream.read(inputBytes);
25             
26            byte[] outputBytes = cipher.doFinal(inputBytes);
27             
28            FileOutputStream outputStream = new FileOutputStream(outputFile);
29            outputStream.write(outputBytes);
30             
31            inputStream.close();
32            outputStream.close();
33             
34        } catch (NoSuchPaddingException | NoSuchAlgorithmException
35                | InvalidKeyException | BadPaddingException
36                | IllegalBlockSizeException | IOException ex) {
37            throw new CryptoException("Error encrypting/decrypting file", ex);
38        }
39    }
40}