/*
* 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.util.buffer.keys;
import java.math.BigInteger;
import java.security.GeneralSecurityException;
import java.security.interfaces.DSAPublicKey;
import java.security.spec.DSAPublicKeySpec;
import org.apache.sshd.common.config.keys.KeyUtils;
import org.apache.sshd.common.keyprovider.KeyPairProvider;
import org.apache.sshd.common.util.ValidateUtils;
import org.apache.sshd.common.util.buffer.Buffer;
/**
* @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a>
*/
public class DSSBufferPublicKeyParser extends AbstractBufferPublicKeyParser<DSAPublicKey> {
public static final DSSBufferPublicKeyParser INSTANCE = new DSSBufferPublicKeyParser();
public DSSBufferPublicKeyParser() {
super(DSAPublicKey.class, KeyPairProvider.SSH_DSS);
}
@Override
public DSAPublicKey getRawPublicKey(String keyType, Buffer buffer) throws GeneralSecurityException {
ValidateUtils.checkTrue(isKeyTypeSupported(keyType), "Unsupported key type: %s", keyType);
BigInteger p = buffer.getMPInt();
BigInteger q = buffer.getMPInt();
BigInteger g = buffer.getMPInt();
BigInteger y = buffer.getMPInt();
return generatePublicKey(KeyUtils.DSS_ALGORITHM, new DSAPublicKeySpec(y, p, q, g));
}
}