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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.ByteArrayInputStream;
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.ASN1InputStream;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERBitString;
import org.bouncycastle.asn1.mozilla.PublicKeyAndChallenge;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;

/**
 * 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
    extends ASN1Object
{
    private static ASN1Sequence toDERSequence(byte[]  bytes)
    {
        try
        {
            ByteArrayInputStream    bIn = new ByteArrayInputStream(bytes);
            ASN1InputStream         aIn = new ASN1InputStream(bIn);

            return (ASN1Sequence)aIn.readObject();
        }
        catch (Exception e)
        {
            throw new IllegalArgumentException("badly encoded request");
        }
    }

    private ASN1Sequence          spkacSeq;
    private PublicKeyAndChallenge pkac;
    private AlgorithmIdentifier   signatureAlgorithm;
    private DERBitString          signature;

    public SignedPublicKeyAndChallenge(byte[] bytes)
    {
        spkacSeq = toDERSequence(bytes);
        pkac = PublicKeyAndChallenge.getInstance(spkacSeq.getObjectAt(0));
        signatureAlgorithm = 
            AlgorithmIdentifier.getInstance(spkacSeq.getObjectAt(1));
        signature = (DERBitString)spkacSeq.getObjectAt(2);
    }

    public ASN1Primitive toASN1Primitive()
    {
        return spkacSeq;
    }

    public PublicKeyAndChallenge getPublicKeyAndChallenge()
    {
        return pkac;
    }

    public boolean verify()
        throws NoSuchAlgorithmException, SignatureException, 
               NoSuchProviderException, InvalidKeyException
    {
        return verify(null);
    }

    public boolean verify(String provider)
        throws NoSuchAlgorithmException, SignatureException, 
               NoSuchProviderException, InvalidKeyException
    {
        Signature sig = null;
        if (provider == null)
        {
            sig = Signature.getInstance(signatureAlgorithm.getAlgorithm().getId());
        }
        else
        {
            sig = Signature.getInstance(signatureAlgorithm.getAlgorithm().getId(), provider);
        }
        PublicKey pubKey = this.getPublicKey(provider);
        sig.initVerify(pubKey);
        try
        {
            DERBitString pkBytes = new DERBitString(pkac);
            sig.update(pkBytes.getBytes());

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

    public PublicKey getPublicKey(String provider)
        throws NoSuchAlgorithmException, NoSuchProviderException, 
               InvalidKeyException
    {
        SubjectPublicKeyInfo subjectPKInfo = pkac.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");
        }
    }
}