Java Code Examples for java.security.KeyStore#getEntry()

private static String encrypt(String data) {
    String encryptedString = null;
    try{
        KeyStore keyStore = KeyStore.getInstance("AndroidKeyStore");
        keyStore.load(null);
        final KeyStore.SecretKeyEntry keyEntry = (KeyStore.SecretKeyEntry) keyStore.getEntry("Empire", null);
        final SecretKey secretKey = keyEntry.getSecretKey();
        final Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");
        cipher.init(Cipher.ENCRYPT_MODE, secretKey);
        byte[] iv = cipher.getIV();
        byte[] encrypted = cipher.doFinal(data.getBytes("UTF-8"));
        byte[] encrypted1 = new byte[iv.length + encrypted.length];
        System.arraycopy(iv, 0, encrypted1, 0, iv.length);
        System.arraycopy(encrypted, 0, encrypted1, iv.length, encrypted.length);
        encryptedString = Base64.encodeToString(encrypted1, Base64.DEFAULT);

    } catch (Exception e) {
        System.out.println(e);
    }
    return encryptedString;
}
 

private void checkAttrs() throws UnrecoverableEntryException,
        GeneralSecurityException, NoSuchAlgorithmException,
        KeyStoreException, IOException {
    KeyStore ks = Utils.loadKeyStore(WORKING_DIRECTORY
            + File.separator
            + KESTORE_NEW, Utils.KeyStoreType.pkcs12, PASSWORD);
    KeyStore.Entry keyStoreEntry = ks.getEntry(ALIAS,
            new KeyStore.PasswordProtection(KEY_PASSWORD));
    out.println("Attributes after store:");
    //print attribute values
    keyStoreEntry.getAttributes().stream().forEach((attr) -> {
        out.println(attr.getName() + ", '" + attr.getValue() + "'");
    });
    Arrays.stream(ATTR_SET).forEach((attr) -> {
        if (!keyStoreEntry.getAttributes().contains(attr)) {
            throw new RuntimeException("Entry doesn't contain attribute: ("
                    + attr.getName() + ", '" + attr.getValue() + "')");
        }
    });
}
 

/**
 * Encrypts randomly generated AES key using RSA public key
 * @param secretKey
 * @return
 */
private byte[] encryptAESKey(byte[] secretKey) throws KeyStoreException,
        UnrecoverableEntryException, NoSuchAlgorithmException, IOException,
        CertificateException, NoSuchProviderException, NoSuchPaddingException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {

    KeyStore keyStore = KeyStore.getInstance(KEY_STORE_ANDROID);
    keyStore.load(null);
    KeyStore.PrivateKeyEntry keyEntry = (KeyStore.PrivateKeyEntry)
            keyStore.getEntry(KEY_ALIAS_AMAZE, null);
    Cipher cipher = Cipher.getInstance(ALGO_RSA, "AndroidOpenSSL");
    cipher.init(Cipher.ENCRYPT_MODE, keyEntry.getCertificate().getPublicKey());

    ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
    CipherOutputStream outputStream = new CipherOutputStream(byteArrayOutputStream, cipher);
    outputStream.write(secretKey);
    outputStream.close();

    return byteArrayOutputStream.toByteArray();
}
 

private Certificate validateServerKeyStore() throws KeyStoreException, CertificateException, NoSuchAlgorithmException, IOException, UnrecoverableEntryException,
        InvalidKeyException, NoSuchProviderException, SignatureException {
    serverConfig = objectMapper.readValue(new ByteArrayInputStream(serverConfigFileOutputStream.toByteArray()), TlsConfig.class);

    KeyStore serverKeyStore = KeyStoreUtils.getKeyStore(serverConfig.getKeyStoreType());
    serverKeyStore.load(new ByteArrayInputStream(serverKeyStoreOutputStream.toByteArray()), serverConfig.getKeyStorePassword().toCharArray());
    String keyPassword = serverConfig.getKeyPassword();
    KeyStore.Entry serverKeyEntry = serverKeyStore.getEntry(TlsToolkitStandalone.NIFI_KEY,
            new KeyStore.PasswordProtection(keyPassword == null ? serverConfig.getKeyStorePassword().toCharArray() : keyPassword.toCharArray()));

    assertTrue(serverKeyEntry instanceof KeyStore.PrivateKeyEntry);
    KeyStore.PrivateKeyEntry privateKeyEntry = (KeyStore.PrivateKeyEntry) serverKeyEntry;
    Certificate[] certificateChain = privateKeyEntry.getCertificateChain();
    assertEquals(1, certificateChain.length);
    Certificate caCertificate = certificateChain[0];
    caCertificate.verify(caCertificate.getPublicKey());
    assertPrivateAndPublicKeyMatch(privateKeyEntry.getPrivateKey(), caCertificate.getPublicKey());
    return caCertificate;
}
 

private static void check(String encodedBlob) throws Exception {
    byte[] blob = new byte[encodedBlob.length() * 2];
    for (int i = 0; i < blob.length; ) {
        final char ch = encodedBlob.charAt(i / 2);
        blob[i++] = (byte) (ch >> 8);
        blob[i++] = (byte) ch;
    }
    KeyStore store = KeyStore.getInstance("PKCS12");
    store.load(new ByteArrayInputStream(blob), new char[0]);
    if (!store.aliases().nextElement().equals("test"))
        throw new Exception("test alias not found");
    KeyStore.PrivateKeyEntry e =
        (KeyStore.PrivateKeyEntry) store.getEntry("test",
                new KeyStore.PasswordProtection(new char[0]));
    X509Certificate cert = (X509Certificate) e.getCertificateChain()[0];
    if (!cert.getSubjectDN().toString().equals("CN=Test Key"))
        throw new Exception("invalid certificate subject DN");
    RSAPrivateCrtKey key = (RSAPrivateCrtKey) e.getPrivateKey();
    if (!key.getPublicExponent().equals(BigInteger.valueOf(65537)))
        throw new Exception("invalid public exponent");
}
 

private static void check(String encodedBlob) throws Exception {
    byte[] blob = new byte[encodedBlob.length() * 2];
    for (int i = 0; i < blob.length; ) {
        final char ch = encodedBlob.charAt(i / 2);
        blob[i++] = (byte) (ch >> 8);
        blob[i++] = (byte) ch;
    }
    KeyStore store = KeyStore.getInstance("PKCS12");
    store.load(new ByteArrayInputStream(blob), new char[0]);
    if (!store.aliases().nextElement().equals("test"))
        throw new Exception("test alias not found");
    KeyStore.PrivateKeyEntry e =
        (KeyStore.PrivateKeyEntry) store.getEntry("test",
                new KeyStore.PasswordProtection(new char[0]));
    X509Certificate cert = (X509Certificate) e.getCertificateChain()[0];
    if (!cert.getSubjectDN().toString().equals("CN=Test Key"))
        throw new Exception("invalid certificate subject DN");
    RSAPrivateCrtKey key = (RSAPrivateCrtKey) e.getPrivateKey();
    if (!key.getPublicExponent().equals(BigInteger.valueOf(65537)))
        throw new Exception("invalid public exponent");
}
 

private void validateClient(Certificate caCertificate) throws IOException, KeyStoreException, CertificateException, NoSuchAlgorithmException,
        UnrecoverableEntryException, InvalidKeyException, NoSuchProviderException, SignatureException {
    clientConfig = objectMapper.readValue(new ByteArrayInputStream(clientConfigFileOutputStream.toByteArray()), TlsClientConfig.class);

    KeyStore clientKeyStore = KeyStoreUtils.getKeyStore(clientConfig.getKeyStoreType());
    clientKeyStore.load(new ByteArrayInputStream(clientKeyStoreOutputStream.toByteArray()), clientConfig.getKeyStorePassword().toCharArray());
    String keyPassword = clientConfig.getKeyPassword();
    KeyStore.Entry clientKeyStoreEntry = clientKeyStore.getEntry(TlsToolkitStandalone.NIFI_KEY,
            new KeyStore.PasswordProtection(keyPassword == null ? clientConfig.getKeyStorePassword().toCharArray() : keyPassword.toCharArray()));

    assertTrue(clientKeyStoreEntry instanceof KeyStore.PrivateKeyEntry);
    KeyStore.PrivateKeyEntry clientPrivateKeyEntry = (KeyStore.PrivateKeyEntry) clientKeyStoreEntry;
    Certificate[] certificateChain = clientPrivateKeyEntry.getCertificateChain();
    assertEquals(2, certificateChain.length);
    assertEquals(caCertificate, certificateChain[1]);
    certificateChain[0].verify(caCertificate.getPublicKey());
    assertPrivateAndPublicKeyMatch(clientPrivateKeyEntry.getPrivateKey(), certificateChain[0].getPublicKey());

    KeyStore clientTrustStore = KeyStoreUtils.getTrustStore(KeystoreType.JKS.toString());
    clientTrustStore.load(new ByteArrayInputStream(clientTrustStoreOutputStream.toByteArray()), clientConfig.getTrustStorePassword().toCharArray());
    assertEquals(caCertificate, clientTrustStore.getCertificate(TlsToolkitStandalone.NIFI_CERT));
}
 

private Certificate validateServerKeyStore() throws KeyStoreException, CertificateException, NoSuchAlgorithmException, IOException, UnrecoverableEntryException,
        InvalidKeyException, NoSuchProviderException, SignatureException {
    serverConfig = objectMapper.readValue(new ByteArrayInputStream(serverConfigFileOutputStream.toByteArray()), TlsConfig.class);

    KeyStore serverKeyStore = KeyStoreUtils.getKeyStore(serverConfig.getKeyStoreType());
    serverKeyStore.load(new ByteArrayInputStream(serverKeyStoreOutputStream.toByteArray()), serverConfig.getKeyStorePassword().toCharArray());
    String keyPassword = serverConfig.getKeyPassword();
    KeyStore.Entry serverKeyEntry = serverKeyStore.getEntry(TlsToolkitStandalone.NIFI_KEY,
            new KeyStore.PasswordProtection(keyPassword == null ? serverConfig.getKeyStorePassword().toCharArray() : keyPassword.toCharArray()));

    assertTrue(serverKeyEntry instanceof KeyStore.PrivateKeyEntry);
    KeyStore.PrivateKeyEntry privateKeyEntry = (KeyStore.PrivateKeyEntry) serverKeyEntry;
    Certificate[] certificateChain = privateKeyEntry.getCertificateChain();
    assertEquals(1, certificateChain.length);
    Certificate caCertificate = certificateChain[0];
    caCertificate.verify(caCertificate.getPublicKey());
    assertPrivateAndPublicKeyMatch(privateKeyEntry.getPrivateKey(), caCertificate.getPublicKey());
    return caCertificate;
}
 

@Nullable
private KeyStore.Entry getKeyStoreEntry(boolean shouldGenerateKey, String alias) {
    try {
        KeyStore keyStore = getKeyStoreAndLoad();

        KeyStore.Entry entry = keyStore.getEntry(alias, null);
        if (entry == null) {
            if (shouldGenerateKey) {
                generateKeyRsa(alias);
                entry = keyStore.getEntry(alias, null);
            }
        }
        return entry;
    } catch (KeyStoreException | NoSuchAlgorithmException | UnrecoverableEntryException e) {
        throw new KeyStoreAccessException("Unable to access keystore", e);
    }
}
 

private boolean verifySignedJAXBObject(Object obj) {
        try {
                DOMResult domResult = new DOMResult();
                JAXB.marshal(obj, domResult);
                Document doc = ((Document) domResult.getNode());
                Element docElement = doc.getDocumentElement();

                KeyStore ks = KeyStore.getInstance(SIGNATURE_KEYSTORE_TYPE);
                URL url = Thread.currentThread().getContextClassLoader().getResource(SIGNATURE_KEYSTORE);
                ks.load(url.openStream(), SIGNATURE_KEYSTORE_PASSWORD.toCharArray());
                KeyStore.PrivateKeyEntry keyEntry = (KeyStore.PrivateKeyEntry) ks.getEntry(SIGNATURE_KEYSTORE_ALIAS, new KeyStore.PasswordProtection(SIGNATURE_KEYSTORE_PASSWORD.toCharArray()));
                PrivateKey privateKey = keyEntry.getPrivateKey();
                Certificate origCert = keyEntry.getCertificate();
                PublicKey validatingKey = origCert.getPublicKey();
                return TckSigningUtil.verifySignature(docElement, validatingKey);
        } catch (Exception e) {
                throw new RuntimeException(e);
        }
}
 

private void run(String keystoreType) throws Exception {
    char[] pw = "password".toCharArray();
    KeyStore ks = KeyStore.getInstance(keystoreType);
    ks.load(null, pw);

    KeyGenerator kg = KeyGenerator.getInstance("AES");
    kg.init(128);
    SecretKey key = kg.generateKey();

    KeyStore.SecretKeyEntry ske = new KeyStore.SecretKeyEntry(key);
    KeyStore.ProtectionParameter kspp = new KeyStore.PasswordProtection(pw);
    ks.setEntry(ALIAS, ske, kspp);

    File ksFile = File.createTempFile("test", ".test");
    try (FileOutputStream fos = new FileOutputStream(ksFile)) {
        ks.store(fos, pw);
        fos.flush();
    }

    // now see if we can get it back
    try (FileInputStream fis = new FileInputStream(ksFile)) {
        KeyStore ks2 = KeyStore.getInstance(keystoreType);
        ks2.load(fis, pw);
        KeyStore.Entry entry = ks2.getEntry(ALIAS, kspp);
        SecretKey keyIn = ((KeyStore.SecretKeyEntry)entry).getSecretKey();
        if (Arrays.equals(key.getEncoded(), keyIn.getEncoded())) {
            System.err.println("OK: worked just fine with " + keystoreType +
                               " keystore");
        } else {
            System.err.println("ERROR: keys are NOT equal after storing in "
                               + keystoreType + " keystore");
        }
    }
}
 

private void run(String keystoreType) throws Exception {
    char[] pw = "password".toCharArray();
    KeyStore ks = KeyStore.getInstance(keystoreType);
    ks.load(null, pw);

    KeyGenerator kg = KeyGenerator.getInstance("AES");
    kg.init(128);
    SecretKey key = kg.generateKey();

    KeyStore.SecretKeyEntry ske = new KeyStore.SecretKeyEntry(key);
    KeyStore.ProtectionParameter kspp = new KeyStore.PasswordProtection(pw);
    ks.setEntry(ALIAS, ske, kspp);

    File ksFile = File.createTempFile("test", ".test");
    try (FileOutputStream fos = new FileOutputStream(ksFile)) {
        ks.store(fos, pw);
        fos.flush();
    }

    // now see if we can get it back
    try (FileInputStream fis = new FileInputStream(ksFile)) {
        KeyStore ks2 = KeyStore.getInstance(keystoreType);
        ks2.load(fis, pw);
        KeyStore.Entry entry = ks2.getEntry(ALIAS, kspp);
        SecretKey keyIn = ((KeyStore.SecretKeyEntry)entry).getSecretKey();
        if (Arrays.equals(key.getEncoded(), keyIn.getEncoded())) {
            System.err.println("OK: worked just fine with " + keystoreType +
                               " keystore");
        } else {
            System.err.println("ERROR: keys are NOT equal after storing in "
                               + keystoreType + " keystore");
        }
    }
}
 

private void testKeyStoreRoundTrip(KeyStoreSupplier initialKeyStoreSupplier, KeyStoreSupplier reloadKeyStoreSupplier, char[] keyPassword) throws GeneralSecurityException, IOException {
    KeyStore keyStore = initialKeyStoreSupplier.get();
    keyStore.load(null, null);
    keyStore.setKeyEntry(ALIAS, issuedCertificateKeyPair.getPrivate(), keyPassword, new Certificate[]{issuedCertificate, caCertificate});

    KeyStore roundTrip = roundTrip(keyStore, reloadKeyStoreSupplier);
    KeyStore.Entry entry = roundTrip.getEntry(ALIAS, new KeyStore.PasswordProtection(keyPassword));
    assertTrue(entry instanceof KeyStore.PrivateKeyEntry);
    KeyStore.PrivateKeyEntry privateKeyEntry = (KeyStore.PrivateKeyEntry) entry;

    Certificate[] certificateChain = privateKeyEntry.getCertificateChain();
    assertArrayEquals(new Certificate[]{issuedCertificate, caCertificate}, certificateChain);
    assertEquals(issuedCertificateKeyPair.getPrivate(), privateKeyEntry.getPrivateKey());
    assertEquals(issuedCertificateKeyPair.getPublic(), certificateChain[0].getPublicKey());
}
 

@Test
public void createKeyStore() throws Exception {
    KeyStore keyStore = KeyStoreUtil.createDockerKeyStore(getFile("certpath"));
    KeyStore.PrivateKeyEntry pkEntry = (KeyStore.PrivateKeyEntry) keyStore.getEntry("docker",
            new KeyStore.PasswordProtection("docker".toCharArray()));
    assertNotNull(pkEntry);
    assertNotNull(pkEntry.getCertificate());
    assertNotNull(keyStore.getCertificate("cn=ca-test,o=internet widgits pty ltd,st=some-state,c=cr"));
    assertNotNull(keyStore.getCertificate("cn=ca-test-2,o=internet widgits pty ltd,st=some-state,c=cr"));
}
 

String decryptString(String alias) {
    try {
        KeyStore keyStore = KeyStore.getInstance("AndroidKeyStore");
        keyStore.load(null);
        KeyStore.PrivateKeyEntry privateKeyEntry = (KeyStore.PrivateKeyEntry)keyStore.getEntry(alias, null);

        Cipher output = Cipher.getInstance("RSA/ECB/PKCS1Padding");
        output.init(Cipher.DECRYPT_MODE, privateKeyEntry.getPrivateKey());

        SharedPreferences sharedPref =PreferenceManager.getDefaultSharedPreferences(c);
        String cipherText = sharedPref.getString("cypher",null);
        CipherInputStream cipherInputStream = new CipherInputStream(
                new ByteArrayInputStream(Base64.decode(cipherText, Base64.DEFAULT)), output);
        ArrayList<Byte> values = new ArrayList<>();
        int nextByte;
        while ((nextByte = cipherInputStream.read()) != -1) {
            values.add((byte)nextByte);
        }

        byte[] bytes = new byte[values.size()];
        for(int i = 0; i < bytes.length; i++) {
            bytes[i] = values.get(i).byteValue();
        }

        String finalText = new String(bytes, 0, bytes.length, "UTF-8");
        return finalText;

    } catch (Exception e) {
        e.printStackTrace();
    }

    return null;
}
 

@Test
public void createKeyStore() throws Exception {
    KeyStore keyStore = KeyStoreUtil.createDockerKeyStore(getFile("certpath"));
    KeyStore.PrivateKeyEntry pkEntry = (KeyStore.PrivateKeyEntry) keyStore.getEntry("docker",
                                                                                    new KeyStore.PasswordProtection("docker".toCharArray()));
    assertNotNull(pkEntry);
    assertNotNull(pkEntry.getCertificate());
    assertNotNull(keyStore.getCertificate("cn=ca-test,o=internet widgits pty ltd,st=some-state,c=cr"));
    assertNotNull(keyStore.getCertificate("cn=ca-test-2,o=internet widgits pty ltd,st=some-state,c=cr"));
}
 

private static byte[] rsaEncrypt(byte[] secret) throws Exception {
    KeyStore keyStore = KeyStore.getInstance(AndroidKeyStore);
    keyStore.load(null);
    KeyStore.PrivateKeyEntry privateKeyEntry = (KeyStore.PrivateKeyEntry) keyStore.getEntry(KEY_ALIAS, null);
    // Encrypt the text
    Cipher inputCipher = Cipher.getInstance(RSA_MODE);
    inputCipher.init(Cipher.ENCRYPT_MODE, privateKeyEntry.getCertificate().getPublicKey());

    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
    CipherOutputStream cipherOutputStream = new CipherOutputStream(outputStream, inputCipher);
    cipherOutputStream.write(secret);
    cipherOutputStream.close();

    return outputStream.toByteArray();
}
 

/**
 * Given some data and a signature, uses the key pair stored in the Android
 * Key Store to verify that the data was signed by this application, using
 * that key pair.
 * 
 * @param input
 *            The data to be verified.
 * @param signatureStr
 *            The signature provided for the data.
 * @return A boolean value telling you whether the signature is valid or
 *         not.
 */
public boolean verifyData(String input, String signatureStr)
		throws KeyStoreException, CertificateException,
		NoSuchAlgorithmException, IOException, UnrecoverableEntryException,
		InvalidKeyException, SignatureException {
	byte[] data = input.getBytes();
	byte[] signature;

	// Make sure the signature string exists. If not, bail out, nothing to
	// do.

	if (signatureStr == null) {
		Log.w(TAG, "Invalid signature.");
		Log.w(TAG, "Exiting verifyData()...");
		return false;
	}

	try {
		// The signature is going to be examined as a byte array,
		// not as a base64 encoded string.
		signature = Base64.decode(signatureStr, Base64.DEFAULT);
	} catch (IllegalArgumentException e) {
		// signatureStr wasn't null, but might not have been encoded
		// properly.
		// It's not a valid Base64 string.
		return false;
	}

	KeyStore ks = KeyStore.getInstance("AndroidKeyStore");

	// Weird artifact of Java API. If you don't have an InputStream to load,
	// you still need
	// to call "load", or it'll crash.
	ks.load(null);

	// Load the key pair from the Android Key Store
	KeyStore.Entry entry = ks.getEntry(mAlias, null);

	if (entry == null) {
		Log.w(TAG, "No key found under alias: " + mAlias);
		Log.w(TAG, "Exiting verifyData()...");
		return false;
	}

	if (!(entry instanceof KeyStore.PrivateKeyEntry)) {
		Log.w(TAG, "Not an instance of a PrivateKeyEntry");
		return false;
	}

	// This class doesn't actually represent the signature,
	// just the engine for creating/verifying signatures, using
	// the specified algorithm.
	Signature s = Signature
			.getInstance(SecurityConstants.SIGNATURE_SHA256withRSA);

	// Verify the data.
	s.initVerify(((KeyStore.PrivateKeyEntry) entry).getCertificate());
	s.update(data);
	boolean valid = s.verify(signature);
	return valid;

}
 

/**
 * Recovers entry associated with given alias.
 *
 * @return an array of objects, where the 1st element in the array is the
 * recovered entry, and the 2nd element is the password used to
 * recover it (null if no password).
 */
private Pair<Entry,char[]> recoverEntry(KeyStore ks,
                        String alias,
                        char[] pstore,
                        char[] pkey) throws Exception {

    if (ks.containsAlias(alias) == false) {
        MessageFormat form = new MessageFormat
            (rb.getString("Alias.alias.does.not.exist"));
        Object[] source = {alias};
        throw new Exception(form.format(source));
    }

    PasswordProtection pp = null;
    Entry entry;

    try {
        // First attempt to access entry without key password
        // (PKCS11 entry or trusted certificate entry, for example)

        entry = ks.getEntry(alias, pp);
        pkey = null;
    } catch (UnrecoverableEntryException une) {

        if(P11KEYSTORE.equalsIgnoreCase(ks.getType()) ||
            KeyStoreUtil.isWindowsKeyStore(ks.getType())) {
            // should not happen, but a possibility
            throw une;
        }

        // entry is protected

        if (pkey != null) {

            // try provided key password

            pp = new PasswordProtection(pkey);
            entry = ks.getEntry(alias, pp);

        } else {

            // try store pass

            try {
                pp = new PasswordProtection(pstore);
                entry = ks.getEntry(alias, pp);
                pkey = pstore;
            } catch (UnrecoverableEntryException une2) {
                if (P12KEYSTORE.equalsIgnoreCase(ks.getType())) {

                    // P12 keystore currently does not support separate
                    // store and entry passwords

                    throw une2;
                } else {

                    // prompt for entry password

                    pkey = getKeyPasswd(alias, null, null);
                    pp = new PasswordProtection(pkey);
                    entry = ks.getEntry(alias, pp);
                }
            }
        }
    }

    return Pair.of(entry, pkey);
}
 

/**
 * Recovers entry associated with given alias.
 *
 * @return an array of objects, where the 1st element in the array is the
 * recovered entry, and the 2nd element is the password used to
 * recover it (null if no password).
 */
private Pair<Entry,char[]> recoverEntry(KeyStore ks,
                        String alias,
                        char[] pstore,
                        char[] pkey) throws Exception {

    if (ks.containsAlias(alias) == false) {
        MessageFormat form = new MessageFormat
            (rb.getString("Alias.alias.does.not.exist"));
        Object[] source = {alias};
        throw new Exception(form.format(source));
    }

    PasswordProtection pp = null;
    Entry entry;

    try {
        // First attempt to access entry without key password
        // (PKCS11 entry or trusted certificate entry, for example)

        entry = ks.getEntry(alias, pp);
        pkey = null;
    } catch (UnrecoverableEntryException une) {

        if(P11KEYSTORE.equalsIgnoreCase(ks.getType()) ||
            KeyStoreUtil.isWindowsKeyStore(ks.getType())) {
            // should not happen, but a possibility
            throw une;
        }

        // entry is protected

        if (pkey != null) {

            // try provided key password

            pp = new PasswordProtection(pkey);
            entry = ks.getEntry(alias, pp);

        } else {

            // try store pass

            try {
                pp = new PasswordProtection(pstore);
                entry = ks.getEntry(alias, pp);
                pkey = pstore;
            } catch (UnrecoverableEntryException une2) {
                if (P12KEYSTORE.equalsIgnoreCase(ks.getType())) {

                    // P12 keystore currently does not support separate
                    // store and entry passwords

                    throw une2;
                } else {

                    // prompt for entry password

                    pkey = getKeyPasswd(alias, null, null);
                    pp = new PasswordProtection(pkey);
                    entry = ks.getEntry(alias, pp);
                }
            }
        }
    }

    return Pair.of(entry, pkey);
}