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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.cert.path.validations;

import java.io.IOException;

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