92 lines
3.3 KiB
Java
92 lines
3.3 KiB
Java
/*
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* Copyright 2014 David Horscroft
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
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* in compliance with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed under the License
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* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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* or implied. See the License for the specific language governing permissions and limitations under
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* the License.
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*
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* NoInfluence is an abstract class allowing for the subclassing of user influences, generated by
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* both actions and the server. Upon login, the user consumes NoByteSets (generated by
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* .getByteSet()) into the primary NoInfluence, which is then applied to the user with
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* .applyTo(NoUser).
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*
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* Examples include incoming messages, financial changes or charges or updates.
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*/
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package nodash.models;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.ObjectInputStream;
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import java.io.ObjectOutputStream;
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import java.io.Serializable;
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import java.security.NoSuchAlgorithmException;
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import java.security.PublicKey;
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import javax.crypto.BadPaddingException;
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import javax.crypto.IllegalBlockSizeException;
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import javax.crypto.KeyGenerator;
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import javax.crypto.SecretKey;
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import nodash.core.NoUtil;
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import nodash.exceptions.NoDashFatalException;
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public abstract class NoInfluence implements Serializable {
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private static final long serialVersionUID = -7509462039664862920L;
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public abstract void applyTo(NoUser user);
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public final NoByteSet getByteSet(PublicKey publicKey) {
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KeyGenerator keyGen;
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try {
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keyGen = KeyGenerator.getInstance(NoUtil.CIPHER_KEY_SPEC);
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} catch (NoSuchAlgorithmException e) {
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throw new NoDashFatalException("Value for CIPHER_KEY_SPEC is not valid.", e);
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}
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keyGen.init(NoUtil.AES_STRENGTH);
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SecretKey secretKey = keyGen.generateKey();
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byte[] key = secretKey.getEncoded();
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byte[] encryptedKey = NoUtil.encryptRsa(key, publicKey);
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byte[] data = this.getEncrypted(key);
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NoUtil.wipeBytes(key);
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return new NoByteSet(encryptedKey, data);
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}
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private final byte[] getEncrypted(byte[] key) {
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try {
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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ObjectOutputStream oos = new ObjectOutputStream(baos);
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oos.writeObject(this);
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byte[] encrypted = NoUtil.encrypt(baos.toByteArray(), key);
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oos.close();
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baos.close();
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return encrypted;
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} catch (IOException e) {
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throw new NoDashFatalException("Unable to write NoInfluence object to byte stream.", e);
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}
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}
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public static NoInfluence decrypt(byte[] data, byte[] key) throws IllegalBlockSizeException,
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BadPaddingException, ClassNotFoundException {
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byte[] decrypted = NoUtil.decrypt(data, key);
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ByteArrayInputStream bais = new ByteArrayInputStream(decrypted);
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try {
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ObjectInputStream ois = new ObjectInputStream(bais);
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NoInfluence noInfluence = (NoInfluence) ois.readObject();
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ois.close();
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bais.close();
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return noInfluence;
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} catch (IOException e) {
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throw new NoDashFatalException("Unable to read out provided data stream.", e);
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}
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}
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}
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