/*
* 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;
import java.security.Key;
import java.security.KeyPair;
import java.security.PublicKey;
import java.security.interfaces.DSAKey;
import java.security.interfaces.ECKey;
import java.security.interfaces.RSAKey;
import java.security.spec.ECParameterSpec;
import org.apache.sshd.common.KeyPairProvider;
import org.apache.sshd.common.digest.MD5;
/**
* Utility class for keys
*
* @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a>
*/
public class KeyUtils {
/**
* Retrieve the public key fingerprint
*
* @param key the public key
* @return the fingerprint
*/
public static String getFingerPrint(PublicKey key) {
try {
Buffer buffer = new Buffer();
buffer.putRawPublicKey(key);
MD5 md5 = new MD5();
md5.init();
md5.update(buffer.array(), 0, buffer.wpos());
byte[] data = md5.digest();
return BufferUtils.printHex(data, 0, data.length, ':');
} catch (Exception e) {
return "Unable to compute fingerprint";
}
}
/**
* Retrieve the key type
*
* @param kp a key pair
* @return the key type
*/
public static String getKeyType(KeyPair kp) {
return getKeyType(kp.getPrivate() != null ? kp.getPrivate() : kp.getPublic());
}
/**
* Retrieve the key type
*
* @param key a public or private key
* @return the key type
*/
public static String getKeyType(Key key) {
if (key instanceof DSAKey) {
return KeyPairProvider.SSH_DSS;
} else if (key instanceof RSAKey) {
return KeyPairProvider.SSH_RSA;
} else if (key instanceof ECKey) {
ECKey ecKey = (ECKey) key;
ECParameterSpec ecSpec = ecKey.getParams();
/*
* TODO make this more robust by checking the actual parameters instead of
* just the field size.
*/
switch (ecSpec.getCurve().getField().getFieldSize()) {
case 256:
return KeyPairProvider.ECDSA_SHA2_NISTP256;
case 384:
return KeyPairProvider.ECDSA_SHA2_NISTP384;
case 521:
return KeyPairProvider.ECDSA_SHA2_NISTP521;
}
}
return null;
}
private KeyUtils() {
}
}