Examples of java.security.KeyFactory.generatePublic()

java.security.KeyFactory.generatePublic()
Generates a public key object from the provided key specification (key material). @param keySpec the specification (key material) of the public key. @return the public key. @exception InvalidKeySpecException if the given key specificationis inappropriate for this key factory to produce a public key.


                info = new SubjectPublicKeyInfo(new AlgorithmIdentifier(X9ObjectIdentifiers.id_ecPublicKey, params), info.getPublicKeyData().getBytes());


                KeyFactory keyFact = KeyFactory.getInstance(key.getAlgorithm(), provider);


                return keyFact.generatePublic(new X509EncodedKeySpec(info.getEncoded()));
            }
        }
        catch (IllegalArgumentException e)
        {
            throw e;

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        PublicKey           pubKey;


        KeyFactory     fact = KeyFactory.getInstance("ECDSA", "BC");


        privKey = fact.generatePrivate(privKeySpec);
        pubKey = fact.generatePublic(pubKeySpec);


        PKCS10CertificationRequest req = new PKCS10CertificationRequest(
                        algorithm, new X509Name("CN=XXX"), pubKey, null, privKey);
        if (!req.verify())
        {

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            new BigInteger("27156aba4126d24a81f3a528cbfb27f56886f840a9f6e86e17a44b94fe9319584b8e22fdde1e5a2e3bd8aa5ba8d8584194eb2190acf832b847f13a3d24a79f4d",16));


        KeyFactory  fact = KeyFactory.getInstance("RSA", "BC");


        PrivateKey privKey = fact.generatePrivate(privKeySpec);
        PublicKey pubKey = fact.generatePublic(pubKeySpec);


        PKCS10CertificationRequest req = new PKCS10CertificationRequest(
                        algorithm, new X509Name("CN=XXX"), pubKey, null, privKey);
        if (!req.verify())
        {

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        // public key encoding test
        //
        byte[]                  pubEnc = keyPair.getPublic().getEncoded();
        KeyFactory              keyFac = KeyFactory.getInstance("ElGamal", "BC");
        X509EncodedKeySpec      pubX509 = new X509EncodedKeySpec(pubEnc);
        DHPublicKey             pubKey = (DHPublicKey)keyFac.generatePublic(pubX509);
        DHParameterSpec         spec = pubKey.getParams();


        if (!spec.getG().equals(elParams.getG()) || !spec.getP().equals(elParams.getP()))
        {
            fail(size + " bit public key encoding/decoding test failed on parameters");

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        // public key encoding test
        //
        byte[]                  pubEnc = keyPair.getPublic().getEncoded();
        KeyFactory              keyFac = KeyFactory.getInstance("ElGamal", "BC");
        X509EncodedKeySpec      pubX509 = new X509EncodedKeySpec(pubEnc);
        DHPublicKey             pubKey = (DHPublicKey)keyFac.generatePublic(pubX509);
        DHParameterSpec         spec = pubKey.getParams();


        if (!spec.getG().equals(elParams.getG()) || !spec.getP().equals(elParams.getP()))
        {
            fail(size + " bit public key encoding/decoding test failed on parameters");

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        PublicKey           pubKey;


        KeyFactory  fact = KeyFactory.getInstance("RSA", "BC");


        privKey = fact.generatePrivate(privKeySpec);
        pubKey = fact.generatePublic(pubKeySpec);


        //
        // distinguished name table.
        //
        Vector                      ord = new Vector();

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        try
        {
            KeyFactory     fact = KeyFactory.getInstance("ECDSA", "BC");


            privKey = fact.generatePrivate(privKeySpec);
            pubKey = fact.generatePublic(pubKeySpec);
        }
        catch (Exception e)
        {
            fail("error setting up keys - " + e.toString());
            return;

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        PublicKey           pubKey;


        KeyFactory     fact = KeyFactory.getInstance("ECDSA", "BC");


        privKey = fact.generatePrivate(privKeySpec);
        pubKey = fact.generatePublic(pubKeySpec);




        //
        // distinguished name table.
        //

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        PublicKey           pubKey;
    
        KeyFactory  fact = KeyFactory.getInstance("RSA", "BC");
    
        privKey = fact.generatePrivate(privKeySpec);
        pubKey = fact.generatePublic(pubKeySpec);
    
        //
        // distinguished name table.
        //
        Vector                      ord = new Vector();

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            new BigInteger("1a8b38f398fa712049898d7fb79ee0a77668791299cdfa09efc0e507acb21ed74301ef5bfd48be455eaeb6e1678255827580a8e4e8e14151d1510a82a3f2e729",16),
            new BigInteger("27156aba4126d24a81f3a528cbfb27f56886f840a9f6e86e17a44b94fe9319584b8e22fdde1e5a2e3bd8aa5ba8d8584194eb2190acf832b847f13a3d24a79f4d",16));


        KeyFactory fact = KeyFactory.getInstance("RSA", "BC");


        return new KeyPair(fact.generatePublic(pubKeySpec), fact.generatePrivate(privKeySpec));
    }


    private void rfc4491Test()
       throws Exception
    {

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