Exemplo n.º 1
0
 /**
  * Reads the raw data from the input File, encrypts and saves its contents to the output File, and
  * then save the raw data of the SecretKey used to the SecretKey File.
  *
  * @param input the File to be read and encrypted
  * @param output the File the encrypted data will be saved to
  * @param keyFile the File the SecretKey data will be saved to
  * @throws InvalidKeyException if the given key is inappropriate for initializing this cipher, or
  *     if this cipher is being initialized for decryption and requires algorithm parameters that
  *     cannot be determined from the given key, or if the given key has a keysize that exceeds the
  *     maximum allowable keysize (as determined from the configured jurisdiction policy files).
  * @throws IOException if any of the files do not exist, are a directory rather than a regular
  *     file, or for some other reason cannot be opened for reading or if an I/O error occurs.
  * @throws IllegalBlockSizeException if the cipher is a block cipher, no padding has been
  *     requested (only in encryption mode), and the total input length of the data processed by
  *     this cipher is not a multiple of block size; or if this encryption algorithm is unable to
  *     process the input data provided.
  * @throws BadPaddingException if the cipher is in decryption mode, and (un)padding has been
  *     requested, but the decrypted data is not bounded by the appropriate padding bytes
  */
 public void encrypt(File input, File output, File keyFile)
     throws InvalidKeyException, IOException, IllegalBlockSizeException, BadPaddingException {
   if (debug) {
     System.out.println("Initializing encryption...");
   }
   cipher.init(Cipher.ENCRYPT_MODE, key);
   FileInputStream fis = null;
   try {
     fis = new FileInputStream(input);
     data = new byte[(int) input.length()];
     if (debug) {
       System.out.println("Reading data...");
     }
     fis.read(data);
   } finally {
     if (fis != null) {
       fis.close();
     }
   }
   if (debug) {
     System.out.println("Encrypting data...");
   }
   data = cipher.doFinal(data);
   FileOutputStream fos = null;
   try {
     fos = new FileOutputStream(output);
     if (debug) {
       System.out.println("Saving data...");
     }
     fos.write(data);
   } finally {
     if (fos != null) {
       fos.close();
     }
   }
   if (debug) {
     System.out.println("Saving key...");
   }
   data = key.getEncoded();
   fos = null;
   try {
     fos = new FileOutputStream(keyFile);
     fos.write(data);
   } finally {
     if (fos != null) {
       fos.close();
     }
   }
   if (debug) {
     System.out.println("Encryption complete!");
   }
   data = null;
 }
Exemplo n.º 2
0
  /**
   * Reads the raw data from the SecretKey File, creates a SecretKey from that raw data, reads the
   * raw data from the input File, and then decrypts and saves its contents to the output File.
   *
   * @param input the File to be read and decrypted
   * @param output the File the decrypted data will be saved to
   * @param keyFile the File the SecretKey data will be loaded from
   * @throws InvalidKeyException if the given key material is shorter than 8 bytes or if the given
   *     key is inappropriate for initializing this cipher, or if this cipher is being initialized
   *     for decryption and requires algorithm parameters that cannot be determined from the given
   *     key, or if the given key has a keysize that exceeds the maximum allowable keysize (as
   *     determined from the configured jurisdiction policy files).
   * @throws IOException if any of the files do not exist, are a directory rather than a regular
   *     file, or for some other reason cannot be opened for reading or if an I/O error occurs.
   * @throws IllegalBlockSizeException if the cipher is a block cipher, no padding has been
   *     requested (only in encryption mode), and the total input length of the data processed by
   *     this cipher is not a multiple of block size; or if this encryption algorithm is unable to
   *     process the input data provided.
   * @throws BadPaddingException if the cipher is in decryption mode, and (un)padding has been
   *     requested, but the decrypted data is not bounded by the appropriate padding bytes.
   * @throws NoSuchAlgorithmException if no Provider supports a SecretKeyFactorySpi implementation
   *     for the specified algorithm.
   * @throws InvalidKeySpecException if the given key specification is inappropriate for this
   *     secret-key factory to produce a secret key.
   * @throws UnsupportedOperationException if algorithm is not DES or DESede
   */
  public void decrypt(File input, File output, File keyFile)
      throws InvalidKeyException, IOException, IllegalBlockSizeException, BadPaddingException,
          NoSuchAlgorithmException, InvalidKeySpecException {
    if (debug) {
      System.out.println("Loading key...");
    }
    FileInputStream fis = null;
    try {
      fis = new FileInputStream(keyFile);
      data = new byte[fis.available()];
      fis.read(data);
    } finally {
      if (fis != null) {
        fis.close();
      }
    }
    switch (Algorithm.valueOf(algorithm)) {
      case DES:
        key = SecretKeyFactory.getInstance(algorithm).generateSecret(new DESKeySpec(data));
        break;
      case DESede:
        key = SecretKeyFactory.getInstance(algorithm).generateSecret(new DESedeKeySpec(data));
        break;
      default:
        throw new UnsupportedOperationException("Unsupported decryption algorithm");
    }

    if (debug) {
      System.out.println("Initializing decryption...");
    }
    cipher.init(Cipher.DECRYPT_MODE, key);
    if (debug) {
      System.out.println("Reading data...");
    }
    fis = null;
    try {
      fis = new FileInputStream(input);
      data = new byte[(int) input.length()];
      fis.read(data);
    } finally {
      if (fis != null) {
        fis.close();
      }
    }
    if (debug) {
      System.out.println("Decrypting data...");
    }
    data = cipher.doFinal(data);
    if (debug) {
      System.out.println("Saving data...");
    }
    FileOutputStream fos = null;
    try {
      fos = new FileOutputStream(output);
      fos.write(data);
    } finally {
      if (fos != null) {
        fos.close();
      }
    }
    if (debug) {
      System.out.println("Decryption complete!");
    }
    data = null;
  }