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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 java.math.BigInteger;

import org.bouncycastle.asn1.x509.BasicConstraints;
import org.bouncycastle.asn1.x509.Extension;
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 BasicConstraintsValidation
    implements CertPathValidation
{
    private boolean          isMandatory;
    private BasicConstraints bc;
    private int pathLengthRemaining;
    private BigInteger maxPathLength;

    public BasicConstraintsValidation()
    {
        this(true);
    }

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

    public void validate(CertPathValidationContext context, X509CertificateHolder certificate)
        throws CertPathValidationException
    {
        if (maxPathLength != null && pathLengthRemaining < 0)
        {
            throw new CertPathValidationException("BasicConstraints path length exceeded");
        }

        context.addHandledExtension(Extension.basicConstraints);

        BasicConstraints certBC = BasicConstraints.fromExtensions(certificate.getExtensions());

        if (certBC != null)
        {
            if (bc != null)
            {
                if (certBC.isCA())
                {
                    BigInteger pathLengthConstraint = certBC.getPathLenConstraint();

                    if (pathLengthConstraint != null)
                    {
                        int plc = pathLengthConstraint.intValue();

                        if (plc < pathLengthRemaining)
                        {
                            pathLengthRemaining = plc;
                            bc = certBC;
                        }
                    }
                }
            }
            else
            {
                bc = certBC;
                if (certBC.isCA())
                {
                    maxPathLength = certBC.getPathLenConstraint();

                    if (maxPathLength != null)
                    {
                        pathLengthRemaining = maxPathLength.intValue();
                    }
                }
            }
        }
        else
        {
            if (bc != null)
            {
                pathLengthRemaining--;
            }
        }

        if (isMandatory && bc == null)
        {
            throw new CertPathValidationException("BasicConstraints not present in path");
        }
    }

    public Memoable copy()
    {
        BasicConstraintsValidation v = new BasicConstraintsValidation(isMandatory);

        v.bc = this.bc;
        v.pathLengthRemaining = this.pathLengthRemaining;

        return v;
    }

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

        this.isMandatory = v.isMandatory;
        this.bc = v.bc;
        this.pathLengthRemaining = v.pathLengthRemaining;
    }
}