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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.path.validations;

import org.bouncycastle.asn1.x509.Extension;
import org.bouncycastle.asn1.x509.KeyUsage;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.cert.path.CertPathValidation;
import org.bouncycastle.cert.path.CertPathValidationContext;
import org.bouncycastle.cert.path.CertPathValidationException;
import org.bouncycastle.util.Memoable;

public class KeyUsageValidation
    implements CertPathValidation
{
    private boolean          isMandatory;

    public KeyUsageValidation()
    {
        this(true);
    }

    public KeyUsageValidation(boolean isMandatory)
    {
        this.isMandatory = isMandatory;
    }

    public void validate(CertPathValidationContext context, X509CertificateHolder certificate)
        throws CertPathValidationException
    {
        context.addHandledExtension(Extension.keyUsage);

        if (!context.isEndEntity())
        {
            KeyUsage usage = KeyUsage.fromExtensions(certificate.getExtensions());

            if (usage != null)
            {
                if (!usage.hasUsages(KeyUsage.keyCertSign))
                {
                    throw new CertPathValidationException("Issuer certificate KeyUsage extension does not permit key signing");
                }
            }
            else
            {
                if (isMandatory)
                {
                    throw new CertPathValidationException("KeyUsage extension not present in CA certificate");
                }
            }
        }
    }

    public Memoable copy()
    {
        return new KeyUsageValidation(isMandatory);
    }

    public void reset(Memoable other)
    {
        KeyUsageValidation v = (KeyUsageValidation)other;

        this.isMandatory = v.isMandatory;
    }
}