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/*
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 * Licensed to the Apache Software Foundation (ASF) under one
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 * or more contributor license agreements.  See the NOTICE file
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 * distributed with this work for additional information
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 * regarding copyright ownership.  The ASF licenses this file
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 * to you under the Apache License, Version 2.0 (the
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 * "License"); you may not use this file except in compliance
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 * with the License.  You may obtain a copy of the License at
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 *
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 *   http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing,
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 * software distributed under the License is distributed on an
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 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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 * KIND, either express or implied.  See the License for the
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 * specific language governing permissions and limitations
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 * under the License.
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 */
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package org.apache.sshd.common;
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import java.security.PrivateKey;
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import java.security.PublicKey;
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/**
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 * Signature interface for SSH used to sign or verify packets
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 * Usually wraps a javax.crypto.Signature object
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 *
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 * @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a>
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 */
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public interface Signature {
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    /**
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     * Initialize this signature with the given public key and private key.
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     * If the private key is null, only signature verification can be performed.
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     *
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     * @param pubkey
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     * @param prvkey
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     * @throws Exception
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     */
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    void init(PublicKey pubkey, PrivateKey prvkey) throws Exception;
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    /**
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     * Update the computed signature with the given data
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     *
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     * @param H
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     * @param off
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     * @param len
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     * @throws Exception
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     */
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    void update(byte[] H, int off, int len) throws Exception;
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    /**
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     * Verify against the given signature
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     *
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     * @param sig
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     * @return
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     * @throws Exception
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     */
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    boolean verify(byte[] sig) throws Exception;
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    /**
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     * Compute the signature
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     *
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     * @return
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     * @throws Exception
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     */
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    byte[] sign() throws Exception;
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}