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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 1.8 and up. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.mozilla;

import java.io.IOException;
import java.io.OutputStream;

import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.mozilla.PublicKeyAndChallenge;
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;
    }

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

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

        OutputStream sOut = verifier.getOutputStream();
        spkacSeq.getPublicKeyAndChallenge().encodeTo(sOut, ASN1Encoding.DER);
        sOut.close();

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

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

    public String getChallenge()
    {
        return spkacSeq.getPublicKeyAndChallenge().getChallengeIA5().getString();
    }

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