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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 1.5 to JDK 1.8. 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.crmf;

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

import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.cmp.PBMParameter;
import org.bouncycastle.asn1.crmf.PKMACValue;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.operator.MacCalculator;
import org.bouncycastle.util.Arrays;

class PKMACValueVerifier
{
    private final PKMACBuilder builder;

    public PKMACValueVerifier(PKMACBuilder builder)
    {
        this.builder = builder;
    }

    public boolean isValid(PKMACValue value, char[] password, SubjectPublicKeyInfo keyInfo)
        throws CRMFException
    {
        builder.setParameters(PBMParameter.getInstance(value.getAlgId().getParameters()));
        MacCalculator calculator = builder.build(password);

        OutputStream macOut = calculator.getOutputStream();

        try
        {
            macOut.write(keyInfo.getEncoded(ASN1Encoding.DER));

            macOut.close();
        }
        catch (IOException e)
        {
            throw new CRMFException("exception encoding mac input: " + e.getMessage(), e);
        }

        return Arrays.constantTimeAreEqual(calculator.getMac(), value.getValue().getBytes());
    }
}