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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 1.8 and up. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.cert.path;

import org.bouncycastle.cert.X509CertificateHolder;

public class CertPath
{
    private final X509CertificateHolder[] certificates;

    public CertPath(X509CertificateHolder[] certificates)
    {
        this.certificates = copyArray(certificates);
    }

    public X509CertificateHolder[] getCertificates()
    {
        return copyArray(certificates);
    }

    public CertPathValidationResult validate(CertPathValidation[] ruleSet)
    {
        CertPathValidationContext context = new CertPathValidationContext(CertPathUtils.getCriticalExtensionsOIDs(certificates));

        for (int i = 0; i != ruleSet.length; i++)
        {
            for (int j = certificates.length - 1; j >= 0; j--)
            {
                try
                {
                    context.setIsEndEntity(j == 0);
                    ruleSet[i].validate(context, certificates[j]);
                }
                catch (CertPathValidationException e)
                {   // TODO: introduce object to hold (i and e)
                    return new CertPathValidationResult(context, j, i, e);
                }
            }
        }

        return new CertPathValidationResult(context);
    }

    public CertPathValidationResult evaluate(CertPathValidation[] ruleSet)
    {
        CertPathValidationContext context = new CertPathValidationContext(CertPathUtils.getCriticalExtensionsOIDs(certificates));

        CertPathValidationResultBuilder builder = new CertPathValidationResultBuilder(context);

        for (int i = 0; i != ruleSet.length; i++)
        {
            for (int j = certificates.length - 1; j >= 0; j--)
            {
                try
                {
                    context.setIsEndEntity(j == 0);
                    ruleSet[i].validate(context, certificates[j]);
                }
                catch (CertPathValidationException e)
                {
                   builder.addException(j, i, e);
                }
            }
        }

        return builder.build();
    }

    private X509CertificateHolder[] copyArray(X509CertificateHolder[] array)
    {
        X509CertificateHolder[] rv = new X509CertificateHolder[array.length];

        System.arraycopy(array, 0, rv, 0, rv.length);

        return rv;
    }

    public int length()
    {
        return certificates.length;
    }
}