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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 1.8. 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.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.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.DERBitString;
import org.bouncycastle.asn1.DEROutputStream;
import org.bouncycastle.asn1.mozilla.PublicKeyAndChallenge;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.operator.ContentVerifier;
import org.bouncycastle.operator.ContentVerifierProvider;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.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.bouncycastle.asn1.mozilla.SignedPublicKeyAndChallenge          spkacSeq;

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

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

    /**
     * Return the underlying ASN.1 structure for this challenge.
     *
     * @return a SignedPublicKeyAndChallenge object.
     */
    public org.bouncycastle.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().getOctets());
    }

    /**
     * @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.getOctets());
            

            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();
    }
}