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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 11. 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 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;
    }
}