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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.mozilla;

import java.io.IOException;
import java.io.OutputStream;
import java.security.InvalidKeyException;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.PublicKey;
import java.security.Signature;
import java.security.SignatureException;
import java.security.spec.X509EncodedKeySpec;

import org.spongycastle.asn1.ASN1Primitive;
import org.spongycastle.asn1.DERBitString;
import org.spongycastle.asn1.DEROutputStream;
import org.spongycastle.asn1.mozilla.PublicKeyAndChallenge;
import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.asn1.x509.SubjectPublicKeyInfo;
import org.spongycastle.operator.ContentVerifier;
import org.spongycastle.operator.ContentVerifierProvider;
import org.spongycastle.operator.OperatorCreationException;
import org.spongycastle.util.Encodable;

/**
 * This is designed to parse the SignedPublicKeyAndChallenge created by the
 * KEYGEN tag included by Mozilla based browsers.
 *   *  PublicKeyAndChallenge ::= SEQUENCE {
 *    spki SubjectPublicKeyInfo,
 *    challenge IA5STRING
 *  }
 *
 *  SignedPublicKeyAndChallenge ::= SEQUENCE {
 *    publicKeyAndChallenge PublicKeyAndChallenge,
 *    signatureAlgorithm AlgorithmIdentifier,
 *    signature BIT STRING
 *  }
 *  
 */
public class SignedPublicKeyAndChallenge
    implements Encodable
{
    protected final org.spongycastle.asn1.mozilla.SignedPublicKeyAndChallenge          spkacSeq;

    public SignedPublicKeyAndChallenge(byte[] bytes)
    {
        spkacSeq = org.spongycastle.asn1.mozilla.SignedPublicKeyAndChallenge.getInstance(bytes);
    }

    protected SignedPublicKeyAndChallenge(org.spongycastle.asn1.mozilla.SignedPublicKeyAndChallenge struct)
    {
        this.spkacSeq = struct;
    }

    /**
     * Return the underlying ASN.1 structure for this challenge.
     *
     * @return a SignedPublicKeyAndChallenge object.
     */
    public org.spongycastle.asn1.mozilla.SignedPublicKeyAndChallenge toASN1Structure()
    {
         return spkacSeq;
    }

    /**
     * @deprecated use toASN1Structure
     */
    public ASN1Primitive toASN1Primitive()
    {
        return spkacSeq.toASN1Primitive();
    }

    public PublicKeyAndChallenge getPublicKeyAndChallenge()
    {
        return spkacSeq.getPublicKeyAndChallenge();
    }

    public boolean isSignatureValid(ContentVerifierProvider verifierProvider)
        throws OperatorCreationException, IOException
    {
        ContentVerifier verifier = verifierProvider.get(spkacSeq.getSignatureAlgorithm());

        OutputStream sOut = verifier.getOutputStream();
        DEROutputStream dOut = new DEROutputStream(sOut);

        dOut.writeObject(spkacSeq.getPublicKeyAndChallenge());

        sOut.close();

        return verifier.verify(spkacSeq.getSignature().getBytes());
    }

    /**
     * @deprecated use ContentVerifierProvider method
     */
    public boolean verify()
        throws NoSuchAlgorithmException, SignatureException, 
               NoSuchProviderException, InvalidKeyException
    {
        return verify((String)null);
    }

    /**
     * @deprecated use ContentVerifierProvider method
     */
    public boolean verify(String provider)
        throws NoSuchAlgorithmException, SignatureException, 
               NoSuchProviderException, InvalidKeyException
    {
        Signature sig = null;
        if (provider == null)
        {
            sig = Signature.getInstance(spkacSeq.getSignatureAlgorithm().getAlgorithm().getId());
        }
        else
        {
            sig = Signature.getInstance(spkacSeq.getSignatureAlgorithm().getAlgorithm().getId(), provider);
        }
        PublicKey pubKey = this.getPublicKey(provider);
        sig.initVerify(pubKey);
        try
        {
            sig.update(spkacSeq.getPublicKeyAndChallenge().getEncoded());

            return sig.verify(spkacSeq.getSignature().getBytes());
        }
        catch (Exception e)
        {
            throw new InvalidKeyException("error encoding public key");
        }
    }

    public SubjectPublicKeyInfo getSubjectPublicKeyInfo()
    {
        return spkacSeq.getPublicKeyAndChallenge().getSubjectPublicKeyInfo();
    }

    public String getChallenge()
    {
        return spkacSeq.getPublicKeyAndChallenge().getChallenge().getString();
    }

    /**
     * @deprecated use JcaSignedPublicKeyAndChallenge.getPublicKey()
     */
    public PublicKey getPublicKey(String provider)
        throws NoSuchAlgorithmException, NoSuchProviderException, 
               InvalidKeyException
    {
        SubjectPublicKeyInfo subjectPKInfo = spkacSeq.getPublicKeyAndChallenge().getSubjectPublicKeyInfo();
        try
        {
            DERBitString bStr = new DERBitString(subjectPKInfo);
            X509EncodedKeySpec xspec = new X509EncodedKeySpec(bStr.getBytes());
            

            AlgorithmIdentifier keyAlg = subjectPKInfo.getAlgorithm();

            KeyFactory factory =
                KeyFactory.getInstance(keyAlg.getAlgorithm().getId(),provider);

            return factory.generatePublic(xspec);
                           
        }
        catch (Exception e)
        {
            throw new InvalidKeyException("error encoding public key");
        }
    }

    public byte[] getEncoded()
        throws IOException
    {
        return toASN1Structure().getEncoded();
    }
}