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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.8 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.cert.ocsp;

import java.io.OutputStream;

import org.bouncycastle.asn1.DERNull;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.ocsp.ResponderID;
import org.bouncycastle.asn1.oiw.OIWObjectIdentifiers;
import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.operator.DigestCalculator;

/**
 * Carrier for a ResponderID.
 */
public class RespID
{
    public static final AlgorithmIdentifier HASH_SHA1 = new AlgorithmIdentifier(OIWObjectIdentifiers.idSHA1, DERNull.INSTANCE);

    ResponderID id;

    public RespID(
        ResponderID id)
    {
        this.id = id;
    }

    public RespID(
        X500Name name)
    {
        this.id = new ResponderID(name);
    }

    /**
     * Calculate a RespID based on the public key of the responder.
     *
     * @param subjectPublicKeyInfo the info structure for the responder public key.
     * @param digCalc a SHA-1 digest calculator.
     * @throws OCSPException on exception creating ID.
     */
    public RespID(
        SubjectPublicKeyInfo     subjectPublicKeyInfo,
        DigestCalculator         digCalc)
        throws OCSPException
    {
        try
        {
            if (!digCalc.getAlgorithmIdentifier().equals(HASH_SHA1))
            {
                throw new IllegalArgumentException("only SHA-1 can be used with RespID - found: " + digCalc.getAlgorithmIdentifier().getAlgorithm());
            }

            OutputStream     digOut = digCalc.getOutputStream();

            digOut.write(subjectPublicKeyInfo.getPublicKeyData().getBytes());
            digOut.close();

            this.id = new ResponderID(new DEROctetString(digCalc.getDigest()));
        }
        catch (Exception e)
        {
            throw new OCSPException("problem creating ID: " + e, e);
        }
    }

    public ResponderID toASN1Primitive()
    {
        return id;
    }

    public boolean equals(
        Object  o)
    {
        if (!(o instanceof RespID))
        {
            return false;
        }

        RespID obj = (RespID)o;

        return id.equals(obj.id);
    }

    public int hashCode()
    {
        return id.hashCode();
    }
}