org.bouncycastle.cert.path.validations.KeyUsageValidation Maven / Gradle / Ivy

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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified.

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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;
    }
}