/*
 * 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.security.eddsa.generic;

import java.security.Key;
import java.security.interfaces.EdECKey;
import java.security.spec.NamedParameterSpec;

import org.apache.sshd.common.util.security.SecurityUtils;

public final class EdDSAKeyTypeDetector {

    private EdDSAKeyTypeDetector() {
        throw new IllegalStateException("No instantiation");
    }

    public static boolean isEd25519(Key key) {
        if (key == null) {
            return false;
        }
        String algorithm = key.getAlgorithm();
        if (SecurityUtils.ED25519.equalsIgnoreCase(algorithm)) {
            return true;
        }
        if (SecurityUtils.EDDSA.equalsIgnoreCase(algorithm)) {
            if (key.getClass().getCanonicalName().startsWith("net.i2p.")) {
                return true;
            }
            if (key instanceof EdECKey) {
                NamedParameterSpec params = ((EdECKey) key).getParams();
                return SecurityUtils.ED25519.equals(params.getName());
            }
        }
        return false;
    }
}
