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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.digest;
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import java.security.MessageDigest;
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import org.apache.sshd.common.Digest;
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import org.apache.sshd.common.util.SecurityUtils;
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/**
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 * Base class for Digest algorithms based on the JCE provider.
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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 class BaseDigest implements Digest {
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    private final String algorithm;
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    private int bsize;
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    private MessageDigest md;
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    /**
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     * Create a new digest using the given algorithm and block size.
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     * The initialization and creation of the underlying {@link MessageDigest}
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     * object will be done in the {@link #init()} method.
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     *
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     * @param algorithm the JCE algorithm to use for this digest
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     * @param bsize the block size of this digest
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     */
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    public BaseDigest(String algorithm, int bsize) {
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        this.algorithm = algorithm;
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        this.bsize = bsize;
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    }
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    public int getBlockSize() {
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        return bsize;
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    }
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    public void init() throws Exception {
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        this.md = SecurityUtils.getMessageDigest(algorithm);
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    }
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    public void update(byte[] foo, int start, int len) throws Exception {
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        md.update(foo, start, len);
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    }
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    public byte[] digest() throws Exception {
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        return md.digest();
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    }
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}