| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.sshd.common.kex.dh; |
| |
| import java.math.BigInteger; |
| import java.util.Objects; |
| |
| import org.apache.sshd.common.SshConstants; |
| import org.apache.sshd.common.SshException; |
| import org.apache.sshd.common.digest.Digest; |
| import org.apache.sshd.common.kex.KeyExchange; |
| import org.apache.sshd.common.session.Session; |
| import org.apache.sshd.common.util.ValidateUtils; |
| import org.apache.sshd.common.util.buffer.Buffer; |
| import org.apache.sshd.common.util.buffer.BufferUtils; |
| import org.apache.sshd.common.util.logging.AbstractLoggingBean; |
| |
| /** |
| * @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a> |
| */ |
| public abstract class AbstractDHKeyExchange extends AbstractLoggingBean implements KeyExchange { |
| protected byte[] v_s; |
| protected byte[] v_c; |
| protected byte[] i_s; |
| protected byte[] i_c; |
| protected Digest hash; |
| protected byte[] k; |
| protected byte[] h; |
| |
| private byte[] e; |
| private BigInteger eValue; |
| private byte[] f; |
| private BigInteger fValue; |
| |
| private final Session session; |
| |
| protected AbstractDHKeyExchange(Session session) { |
| this.session = Objects.requireNonNull(session, "No session provided"); |
| } |
| |
| @Override |
| public void init(byte[] v_s, byte[] v_c, byte[] i_s, byte[] i_c) throws Exception { |
| this.v_s = ValidateUtils.checkNotNullAndNotEmpty(v_s, "No v_s value"); |
| this.v_c = ValidateUtils.checkNotNullAndNotEmpty(v_c, "No v_c value"); |
| this.i_s = ValidateUtils.checkNotNullAndNotEmpty(i_s, "No i_s value"); |
| this.i_c = ValidateUtils.checkNotNullAndNotEmpty(i_c, "No i_c value"); |
| } |
| |
| @Override |
| public Session getSession() { |
| return session; |
| } |
| |
| @Override |
| public Digest getHash() { |
| return hash; |
| } |
| |
| @Override |
| public byte[] getH() { |
| return h; |
| } |
| |
| @Override |
| public byte[] getK() { |
| return k; |
| } |
| |
| protected byte[] getE() { |
| return e; |
| } |
| |
| protected BigInteger getEValue() { |
| if (eValue == null) { |
| eValue = BufferUtils.fromMPIntBytes(getE()); |
| } |
| |
| return eValue; |
| } |
| |
| protected byte[] updateE(Buffer buffer) { |
| return updateE(buffer.getMPIntAsBytes()); |
| } |
| |
| protected byte[] updateE(byte[] mpInt) { |
| setE(mpInt); |
| return mpInt; |
| } |
| |
| protected void setE(byte[] e) { |
| this.e = e; |
| |
| if (eValue != null) { |
| eValue = null; // force lazy re-initialization |
| } |
| } |
| |
| protected void validateEValue(BigInteger pValue) throws SshException { |
| BigInteger value = Objects.requireNonNull(getEValue(), "No DH 'e' value set"); |
| if (!KeyExchange.isValidDHValue(value, pValue)) { |
| throw new SshException(SshConstants.SSH2_DISCONNECT_KEY_EXCHANGE_FAILED, |
| "Protocol error: invalid DH 'e' value"); |
| } |
| } |
| |
| protected byte[] getF() { |
| return f; |
| } |
| |
| protected BigInteger getFValue() { |
| if (fValue == null) { |
| fValue = BufferUtils.fromMPIntBytes(getF()); |
| } |
| |
| return fValue; |
| } |
| |
| protected byte[] updateF(Buffer buffer) { |
| return updateF(buffer.getMPIntAsBytes()); |
| } |
| |
| protected byte[] updateF(byte[] mpInt) { |
| setF(mpInt); |
| return mpInt; |
| } |
| |
| protected void setF(byte[] f) { |
| this.f = f; |
| |
| if (fValue != null) { |
| fValue = null; // force lazy re-initialization |
| } |
| } |
| |
| protected void validateFValue(BigInteger pValue) throws SshException { |
| BigInteger value = Objects.requireNonNull(getFValue(), "No DH 'f' value set"); |
| if (!KeyExchange.isValidDHValue(value, pValue)) { |
| throw new SshException(SshConstants.SSH2_DISCONNECT_KEY_EXCHANGE_FAILED, |
| "Protocol error: invalid DH 'f' value"); |
| } |
| } |
| |
| @Override |
| public String toString() { |
| return getClass().getSimpleName() + "[" + getName() + "]"; |
| } |
| } |