/*
* 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.security.GeneralSecurityException;
import java.security.NoSuchAlgorithmException;
import java.security.interfaces.ECPublicKey;
import java.security.spec.ECParameterSpec;
import java.security.spec.ECPoint;
import java.security.spec.ECPublicKeySpec;
import java.security.spec.InvalidKeySpecException;
import org.apache.sshd.common.cipher.ECCurves;
import org.apache.sshd.common.config.keys.KeyUtils;
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 ECBufferPublicKeyParser extends AbstractBufferPublicKeyParser<ECPublicKey> {
public static final ECBufferPublicKeyParser INSTANCE = new ECBufferPublicKeyParser();
public ECBufferPublicKeyParser() {
super(ECPublicKey.class, ECCurves.KEY_TYPES);
}
@Override
public ECPublicKey getRawPublicKey(String keyType, Buffer buffer) throws GeneralSecurityException {
ValidateUtils.checkTrue(isKeyTypeSupported(keyType), "Unsupported key type: %s", keyType);
ECCurves curve = ECCurves.fromKeyType(keyType);
if (curve == null) {
throw new NoSuchAlgorithmException("Unsupported raw public algorithm: " + keyType);
}
String curveName = curve.getName();
ECParameterSpec params = curve.getParameters();
return getRawECKey(curveName, params, buffer);
}
protected ECPublicKey getRawECKey(String expectedCurve, ECParameterSpec spec, Buffer buffer) throws GeneralSecurityException {
String curveName = buffer.getString();
if (!expectedCurve.equals(curveName)) {
throw new InvalidKeySpecException("getRawECKey(" + expectedCurve + ") curve name does not match expected: " + curveName);
}
if (spec == null) {
throw new InvalidKeySpecException("getRawECKey(" + expectedCurve + ") missing curve parameters");
}
byte[] octets = buffer.getBytes();
ECPoint w;
try {
w = ECCurves.octetStringToEcPoint(octets);
} catch (RuntimeException e) {
throw new InvalidKeySpecException("getRawECKey(" + expectedCurve + ")"
+ " cannot (" + e.getClass().getSimpleName() + ")"
+ " retrieve W value: " + e.getMessage(),
e);
}
return generatePublicKey(KeyUtils.EC_ALGORITHM, new ECPublicKeySpec(w, spec));
}
}