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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.io.IOException;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Null;
import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.cert.CertException;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.cert.X509ContentVerifierProviderBuilder;
import org.bouncycastle.cert.path.CertPathValidation;
import org.bouncycastle.cert.path.CertPathValidationContext;
import org.bouncycastle.cert.path.CertPathValidationException;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.util.Memoable;

public class ParentCertIssuedValidation
    implements CertPathValidation
{
    private X509ContentVerifierProviderBuilder contentVerifierProvider;

    private X500Name workingIssuerName;
    private SubjectPublicKeyInfo workingPublicKey;
    private AlgorithmIdentifier workingAlgId;

    public ParentCertIssuedValidation(X509ContentVerifierProviderBuilder contentVerifierProvider)
    {
        this.contentVerifierProvider = contentVerifierProvider;
    }

    public void validate(CertPathValidationContext context, X509CertificateHolder certificate)
        throws CertPathValidationException
    {
        if (workingIssuerName != null)
        {
           if (!workingIssuerName.equals(certificate.getIssuer()))
           {
               throw new CertPathValidationException("Certificate issue does not match parent");
           }
        }

        if (workingPublicKey != null)
        {
            try
            {
                SubjectPublicKeyInfo validatingKeyInfo;

                if (workingPublicKey.getAlgorithm().equals(workingAlgId))
                {
                    validatingKeyInfo = workingPublicKey;
                }
                else
                {
                    validatingKeyInfo = new SubjectPublicKeyInfo(workingAlgId, workingPublicKey.parsePublicKey());
                }

                if (!certificate.isSignatureValid(contentVerifierProvider.build(validatingKeyInfo)))
                {
                    throw new CertPathValidationException("Certificate signature not for public key in parent");
                }
            }
            catch (OperatorCreationException e)
            {
                throw new CertPathValidationException("Unable to create verifier: " + e.getMessage(), e);
            }
            catch (CertException e)
            {
                throw new CertPathValidationException("Unable to validate signature: " + e.getMessage(), e);
            }
            catch (IOException e)
            {
                throw new CertPathValidationException("Unable to build public key: " + e.getMessage(), e);
            }
        }

        workingIssuerName = certificate.getSubject();
        workingPublicKey = certificate.getSubjectPublicKeyInfo();

        if (workingAlgId != null)
        {
            // check for inherited parameters
            if (workingPublicKey.getAlgorithm().getAlgorithm().equals(workingAlgId.getAlgorithm()))
            {
                if (!isNull(workingPublicKey.getAlgorithm().getParameters()))
                {
                    workingAlgId = workingPublicKey.getAlgorithm();
                }
            }
            else
            {
                workingAlgId = workingPublicKey.getAlgorithm();
            }
        }
        else
        {
            workingAlgId = workingPublicKey.getAlgorithm();
        }
    }

    private boolean isNull(ASN1Encodable obj)
    {
        return obj == null || obj instanceof ASN1Null;
    }

    public Memoable copy()
    {
        ParentCertIssuedValidation v = new ParentCertIssuedValidation(contentVerifierProvider);

        v.workingAlgId = this.workingAlgId;
        v.workingIssuerName = this.workingIssuerName;
        v.workingPublicKey = this.workingPublicKey;

        return v;
    }

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

        this.contentVerifierProvider = v.contentVerifierProvider;
        this.workingAlgId = v.workingAlgId;
        this.workingIssuerName = v.workingIssuerName;
        this.workingPublicKey = v.workingPublicKey;
    }
}