Smack/smack-experimental/src/main/java/org/jivesoftware/smackx/jet/internal/JetSecurity.java

119 lines
4.6 KiB
Java

/**
*
* Copyright 2017 Paul Schaub
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jivesoftware.smackx.jet.internal;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.jivesoftware.smack.XMPPConnection;
import org.jivesoftware.smack.packet.ExtensionElement;
import org.jivesoftware.smackx.bytestreams.BytestreamSession;
import org.jivesoftware.smackx.jet.JetManager;
import org.jivesoftware.smackx.jet.JingleEncryptionMethod;
import org.jivesoftware.smackx.jet.element.JetSecurityElement;
import org.jivesoftware.smackx.jingle.callbacks.JingleSecurityCallback;
import org.jivesoftware.smackx.jingle.components.JingleSecurity;
import org.jivesoftware.smackx.jingle.element.JingleContentSecurityInfoElement;
import org.jivesoftware.smackx.jingle.element.JingleElement;
/**
* Created by vanitas on 22.07.17.
*/
public class JetSecurity extends JingleSecurity<JetSecurityElement> {
public static final String NAMESPACE_V0 = "urn:xmpp:jingle:jet:0";
public static final String NAMESPACE = NAMESPACE_V0;
private final String methodNamespace;
private final Cipher cipher;
private ExtensionElement child;
public JetSecurity(Cipher cipher, ExtensionElement child) {
super();
this.cipher = cipher;
this.child = child;
this.methodNamespace = child.getNamespace();
}
public JetSecurity(String methodNamespace, XMPPConnection connection)
throws NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException,
InvalidAlgorithmParameterException, InvalidKeyException {
this.methodNamespace = methodNamespace;
JetManager jetManager = JetManager.getInstanceFor(connection);
JingleEncryptionMethod encryptionMethod = jetManager.getEncryptionMethod(methodNamespace);
if (encryptionMethod == null) {
throw new IllegalStateException("No encryption method with namespace " + methodNamespace + " registered.");
}
//Create key and cipher
int keyLength = 256;
String keyType = "AES";
String cipherMode = "AES/GCM/NoPadding";
KeyGenerator keyGenerator = KeyGenerator.getInstance(keyType);
keyGenerator.init(keyLength);
byte[] key = keyGenerator.generateKey().getEncoded();
SecureRandom secureRandom = new SecureRandom();
byte[] iv = new byte[keyLength];
secureRandom.nextBytes(iv);
byte[] keyAndIv = new byte[2 * keyLength];
System.arraycopy(key, 0, keyAndIv, 0, keyLength);
System.arraycopy(iv, 0, keyAndIv, keyLength, keyLength);
SecretKey secretKey = new SecretKeySpec(key, keyType);
IvParameterSpec ivSpec = new IvParameterSpec(iv);
cipher = Cipher.getInstance(cipherMode, "BC");
cipher.init(Cipher.ENCRYPT_MODE, secretKey, ivSpec);
}
@Override
public JetSecurityElement getElement() {
return new JetSecurityElement(getParent().getName(), child);
}
@Override
public JingleElement handleSecurityInfo(JingleContentSecurityInfoElement element, JingleElement wrapping) {
return null;
}
@Override
public void decryptIncomingBytestream(BytestreamSession bytestreamSession, JingleSecurityCallback callback) {
JetSecurityBytestreamSession securityBytestreamSession = new JetSecurityBytestreamSession(bytestreamSession, cipher);
callback.onSecurityReady(securityBytestreamSession);
}
@Override
public void encryptIncomingBytestream(BytestreamSession bytestreamSession, JingleSecurityCallback callback) {
JetSecurityBytestreamSession securityBytestreamSession = new JetSecurityBytestreamSession(bytestreamSession, cipher);
callback.onSecurityReady(securityBytestreamSession);
}
}