private void sealedObjectTest() throws Exception {
KeyPairGenerator kpg = KeyPairGenerator.getInstance("ECIES");
kpg.initialize(new ECGenParameterSpec("secp256r1"));
KeyPair keyPair = kpg.generateKeyPair();
Cipher cipher = Cipher.getInstance("ECIES");
cipher.init(Cipher.ENCRYPT_MODE, keyPair.getPublic());
String toEncrypt = "Hello";
// Check that cipher works ok
cipher.doFinal(toEncrypt.getBytes());
// Using a SealedObject to encrypt the same string fails with a NullPointerException
SealedObject sealedObject = new SealedObject(toEncrypt, cipher);
cipher.init(Cipher.DECRYPT_MODE, keyPair.getPrivate());
String result = (String) sealedObject.getObject(cipher);
isTrue("result wrong", result.equals(toEncrypt));
result = (String) sealedObject.getObject(keyPair.getPrivate());
isTrue("result wrong", result.equals(toEncrypt));
}
/**
* Decrypt and extract a message from SealedObject
*
* @param encryptedMsgObj - encrypted SealedObject
* @return message
*/
public String decryptMsg(SealedObject encryptedMsgObj) {
String plainText = null;
try {
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, sessionKey);
plainText = (String) encryptedMsgObj.getObject(cipher);
} catch (NoSuchAlgorithmException e) {
System.out.println("Error: No algorithm entered exists.");
System.exit(1);
} catch (NoSuchPaddingException e) {
System.out.println("Error: transformation contains a padding scheme is not available.");
System.exit(1);
} catch (InvalidKeyException e) {
System.out.println("Error: the session key is invalid.");
System.exit(1);
} catch (ClassNotFoundException e) {
System.out.println("Error: cannot typecast to byte[].");
System.exit(1);
} catch (IllegalBlockSizeException e) {
System.out.println("Error: the block size is invalid.");
System.exit(1);
} catch (BadPaddingException e) {
System.out.println("Error: decrypted data is not bounded by the valid padding bytes.");
System.exit(1);
} catch (IOException e) {
System.out.println("Error: cannot decrypt message.");
}
return plainText;
}
public static Keyring load(File keyringFile, char[] passphrase) throws IOException {
ObjectInputStream is = null;
try {
is = new ObjectInputStream(new FileInputStream(keyringFile));
try {
byte[] salt = (byte[]) is.readObject();
Cipher cipher = getCipher(passphrase, salt, Cipher.DECRYPT_MODE);
SealedObject skr = (SealedObject) is.readObject();
return (Keyring) skr.getObject(cipher);
} catch (GeneralSecurityException e) {
throw new RuntimeException(e);
} catch (ClassNotFoundException e) {
throw new RuntimeException(e);
}
} finally {
if (is != null) is.close();
}
}