org.jnotary.crypto.Hasher.java Source code

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Here is the source code for org.jnotary.crypto.Hasher.java

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/*******************************************************************************
 * Copyright (c) 2013 aib.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 * 
 * Contributors:
 *     aib - initial API and implementation
 ******************************************************************************/
package org.jnotary.crypto;

import java.io.IOException;
import java.io.OutputStream;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.operator.DigestCalculator;
import org.bouncycastle.operator.DigestCalculatorProvider;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.operator.jcajce.JcaDigestCalculatorProviderBuilder;

public class Hasher {
    public static byte[] makeHash(ASN1ObjectIdentifier algorithm, byte[] data)
            throws OperatorCreationException, IOException {
        DigestCalculatorProvider calcProvider = new JcaDigestCalculatorProviderBuilder().setProvider("BC").build();
        DigestCalculator calc = calcProvider.get(new AlgorithmIdentifier(algorithm));
        OutputStream stream = null;
        try {
            stream = calc.getOutputStream();
            stream.write(data);
        } finally {
            stream.close();
        }
        return calc.getDigest();
    }
}