org.cesecore.certificates.ocsp.SHA1DigestCalculator Maven / Gradle / Ivy

/*************************************************************************
 *                                                                       *
 *  CESeCore: CE Security Core                                           *
 *                                                                       *
 *  This software is free software; you can redistribute it and/or       *
 *  modify it under the terms of the GNU Lesser General Public           *
 *  License as published by the Free Software Foundation; either         *
 *  version 2.1 of the License, or any later version.                    *
 *                                                                       *
 *  See terms of license at gnu.org.                                     *
 *                                                                       *
 *************************************************************************/
package org.cesecore.certificates.ocsp;

import java.io.ByteArrayOutputStream;
import java.io.OutputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.cert.ocsp.RespID;
import org.bouncycastle.operator.DigestCalculator;
import org.cesecore.certificates.ocsp.exception.OcspFailureException;

/**
 * @version $Id: SHA1DigestCalculator.java 18437 2014-02-03 12:46:08Z mikekushner $
 *
 */
public class SHA1DigestCalculator implements DigestCalculator {
    private ByteArrayOutputStream bOut = new ByteArrayOutputStream();
    private MessageDigest digest;

    public SHA1DigestCalculator(MessageDigest digest) {
        this.digest = digest;
    }

    public AlgorithmIdentifier getAlgorithmIdentifier() {
        return RespID.HASH_SHA1;
    }

    public OutputStream getOutputStream() {
        return bOut;
    }

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

        bOut.reset();

        return bytes;
    }
    
    public static SHA1DigestCalculator buildSha1Instance() {
        try {
            return new SHA1DigestCalculator(MessageDigest.getInstance("SHA1"));
        } catch (NoSuchAlgorithmException e) {
            throw new OcspFailureException(e);
        }
    }
}