eu.betaas.taas.securitymanager.common.ec.operator.SHA1DigestCalculator.java Source code

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Here is the source code for eu.betaas.taas.securitymanager.common.ec.operator.SHA1DigestCalculator.java

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/**
Copyright 2014-2015 Center for TeleInFrastruktur (CTIF), Aalborg University
    
Licensed 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.
    
@author Bayu Anggorojati [ba@es.aau.dk]
Center for TeleInFrastruktur, Aalborg University, Denmark
 */

package eu.betaas.taas.securitymanager.common.ec.operator;

import java.io.ByteArrayOutputStream;
import java.io.OutputStream;

import org.bouncycastle.asn1.oiw.OIWObjectIdentifiers;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.digests.SHA1Digest;
import org.bouncycastle.operator.DigestCalculator;

public class SHA1DigestCalculator implements DigestCalculator {
    private ByteArrayOutputStream bOut = new ByteArrayOutputStream();

    public AlgorithmIdentifier getAlgorithmIdentifier() {
        return new AlgorithmIdentifier(OIWObjectIdentifiers.idSHA1);
    }

    public OutputStream getOutputStream() {
        return bOut;
    }

    public byte[] getDigest() {
        byte[] bytes = bOut.toByteArray();

        bOut.reset();

        Digest sha1 = new SHA1Digest();

        sha1.update(bytes, 0, bytes.length);

        byte[] digest = new byte[sha1.getDigestSize()];

        sha1.doFinal(digest, 0);

        return digest;
    }
}