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/*
 * 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.client.auth.pubkey;

import java.security.PublicKey;

/**
 * Represents a public key identity
 *
 * @author Apache MINA SSHD Project
 */
public interface PublicKeyIdentity {
    /**
     * @return The {@link PublicKey} identity value
     */
    PublicKey getPublicKey();

    /**
     * Proves the public key identity by signing the given data
     *
     * @param data Data to sign
     * @return Signed data - using the identity
     * @throws Exception If failed to sign the data
     */
    byte[] sign(byte[] data) throws Exception;
}