if (args.length != 2) {
System.err.println("Usage: java FileEncryptor filename password");
return;
}
String filename = args[0];
String password = args[1];
if (password.length() < 8 ) {
System.err.println("Password must be at least eight characters long");
}
try {
FileInputStream fin = new FileInputStream(args[0]);
FileOutputStream fout = new FileOutputStream(args[0] + ".des");
// Create a key.
byte[] desKeyData = password.getBytes();
DESKeySpec desKeySpec = new DESKeySpec(desKeyData);
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey desKey = keyFactory.generateSecret(desKeySpec);
// Use Data Encryption Standard.
Cipher des = Cipher.getInstance("DES/CBC/PKCS5Padding");
des.init(Cipher.ENCRYPT_MODE, desKey);
// Write the initialization vector onto the output.
byte[] iv = des.getIV();
DataOutputStream dout = new DataOutputStream(fout);
dout.writeInt(iv.length);
dout.write(iv);
byte[] input = new byte[64];
while (true) {
int bytesRead = fin.read(input);
if (bytesRead == -1) break;
byte[] output = des.update(input, 0, bytesRead);
if (output != null) dout.write(output);
}
byte[] output = des.doFinal();
if (output != null) dout.write(output);
fin.close();
dout.flush();
dout.close();
}
catch (InvalidKeySpecException ex) {System.err.println(ex);}
catch (InvalidKeyException ex) {System.err.println(ex);}
catch (NoSuchAlgorithmException ex) {System.err.println(ex);}
catch (NoSuchPaddingException ex) {System.err.println(ex);}
catch (BadPaddingException ex) {System.err.println(ex);}
catch (IllegalBlockSizeException ex) {System.err.println(ex);}
catch (IOException ex) {System.err.println(ex);}
