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.

            {
                KeyFactory kf = KeyFactory.getInstance(wrappedKeyAlgorithm, BouncyCastleProvider.PROVIDER_NAME);


                if (wrappedKeyType == Cipher.PUBLIC_KEY)
                {
                    return kf.generatePublic(new X509EncodedKeySpec(encoded));
                }
                else if (wrappedKeyType == Cipher.PRIVATE_KEY)
                {
                    return kf.generatePrivate(new PKCS8EncodedKeySpec(encoded));
                }

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    X509EncodedKeySpec spec = new X509EncodedKeySpec(Base64.decodeBase64(b64string));
    // Note: EC KeyFactory does not exist in openjdk, only Oracle's JDK.
    KeyFactory kf = null;
    try {
      kf = KeyFactory.getInstance("EC");
      return kf.generatePublic(spec);
    } catch (NoSuchAlgorithmException e) {
      // EC is known to be missing from openjdk; Oracle's JDK must be used.
      throw new UnsupportedCryptoPrimitiveException("EC support missing", e);
    } catch (InvalidKeySpecException e) {
      throw new InvalidInputException("Log public key is invalid", e);

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        //
        // set up the keys
        //
        KeyFactory          fact = KeyFactory.getInstance("RSA", "BC");
        PrivateKey          caPrivKey = fact.generatePrivate(caPrivKeySpec);
        PublicKey           caPubKey = fact.generatePublic(caPubKeySpec);
        PrivateKey          privKey = fact.generatePrivate(privKeySpec);
        PublicKey           pubKey = fact.generatePublic(pubKeySpec);


        //
        // note in this case we are using the CA certificate for both the client cetificate

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        //
        KeyFactory          fact = KeyFactory.getInstance("RSA", "BC");
        PrivateKey          caPrivKey = fact.generatePrivate(caPrivKeySpec);
        PublicKey           caPubKey = fact.generatePublic(caPubKeySpec);
        PrivateKey          privKey = fact.generatePrivate(privKeySpec);
        PublicKey           pubKey = fact.generatePublic(pubKeySpec);


        //
        // note in this case we are using the CA certificate for both the client cetificate
        // and the attribute certificate. This is to make the vcode simpler to read, in practice
        // the CA for the attribute certificate should be different to that of the client certificate

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


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

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        //
        // set up the keys
        //
        KeyFactory          fact = KeyFactory.getInstance("RSA", "BC");
        PrivateKey          caPrivKey  = fact.generatePrivate(caPrivKeySpec);
        PublicKey           caPubKey   = fact.generatePublic(caPubKeySpec);
        PrivateKey          intPrivKey = fact.generatePrivate(intPrivKeySpec);
        PublicKey           intPubKey  = fact.generatePublic(intPubKeySpec);
        PrivateKey          privKey    = fact.generatePrivate(privKeySpec);
        PublicKey           pubKey     = fact.generatePublic(pubKeySpec);

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        //
        KeyFactory          fact = KeyFactory.getInstance("RSA", "BC");
        PrivateKey          caPrivKey  = fact.generatePrivate(caPrivKeySpec);
        PublicKey           caPubKey   = fact.generatePublic(caPubKeySpec);
        PrivateKey          intPrivKey = fact.generatePrivate(intPrivKeySpec);
        PublicKey           intPubKey  = fact.generatePublic(intPubKeySpec);
        PrivateKey          privKey    = fact.generatePrivate(privKeySpec);
        PublicKey           pubKey     = fact.generatePublic(pubKeySpec);
        
        X509Certificate     trustCert       = createTrustCert(caPubKey, caPrivKey);
        CertificatePolicies intPolicies     = null;

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        PrivateKey          caPrivKey  = fact.generatePrivate(caPrivKeySpec);
        PublicKey           caPubKey   = fact.generatePublic(caPubKeySpec);
        PrivateKey          intPrivKey = fact.generatePrivate(intPrivKeySpec);
        PublicKey           intPubKey  = fact.generatePublic(intPubKeySpec);
        PrivateKey          privKey    = fact.generatePrivate(privKeySpec);
        PublicKey           pubKey     = fact.generatePublic(pubKeySpec);
        
        X509Certificate     trustCert       = createTrustCert(caPubKey, caPrivKey);
        CertificatePolicies intPolicies     = null;
        Hashtable           map             = null;
        ASN1EncodableVector policies        = null;

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        // public key encoding test
        //
        byte[]              pubEnc = aKeyPair.getPublic().getEncoded();
        KeyFactory          keyFac = KeyFactory.getInstance("ECDH", "BC");
        X509EncodedKeySpec  pubX509 = new X509EncodedKeySpec(pubEnc);
        ECPublicKey         pubKey = (ECPublicKey)keyFac.generatePublic(pubX509);


        if (!pubKey.getW().equals(((ECPublicKey)aKeyPair.getPublic()).getW()))
        {
            fail("public key encoding (Q test) failed");
        }

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        // public key encoding test
        //
        byte[]              pubEnc = vKey.getEncoded();
        KeyFactory          keyFac = KeyFactory.getInstance("ECDH", "BC");
        X509EncodedKeySpec  pubX509 = new X509EncodedKeySpec(pubEnc);
        ECPublicKey         pubKey = (ECPublicKey)keyFac.generatePublic(pubX509);


        if (!pubKey.getW().equals(((ECPublicKey)vKey).getW()))
        {
            fail("public key encoding (Q test) failed");
        }

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