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