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.

        PrivateKey privateKey = kf.generatePrivate(keySpec);
        if (privateKey instanceof RSAPrivateCrtKey) {
          RSAPrivateCrtKey rsaPrivateCrtKey = (RSAPrivateCrtKey) privateKey;
          RSAPublicKeySpec publicKeySpec = new java.security.spec.RSAPublicKeySpec(
              rsaPrivateCrtKey.getModulus(), rsaPrivateCrtKey.getPublicExponent());
          PublicKey publicKey = kf.generatePublic(publicKeySpec);
          key = new KeyPair(publicKey, privateKey);
        } else {
          key = privateKey;
        }
      } catch (Exception e) {

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    KeyFactory keyFactory = getKeyFactory();


    PublicKey pubKey;
    try {
      pubKey = keyFactory.generatePublic(pubKeySpec);
    } catch (InvalidKeySpecException e) {
      throw new IllegalArgumentException("Error deserializing public key", e);
    }
    return pubKey;
  }

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    }


    public void computeK(BigInteger f)
            throws GeneralSecurityException {
        final KeyFactory keyFactory = SecurityUtils.getKeyFactory("DH");
        final PublicKey yourPubKey = keyFactory.generatePublic(new DHPublicKeySpec(f, p, g));
        agreement.doPhase(yourPubKey, true);
        K = new BigInteger(1, agreement.generateSecret());
    }


    public BigInteger getE() {

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    public static ECPublicKey getPublicKey(byte[] data, Curves curve) {
        ECPublicKey remotePublicKey = null;
        try {
            X509EncodedKeySpec ks = new X509EncodedKeySpec(data);
            KeyFactory kf = KeyFactory.getInstance("EC", curve.kfProvider);
            remotePublicKey = (ECPublicKey)kf.generatePublic(ks);
            
        } catch (NoSuchAlgorithmException e) {
            Logger.error(ECDSA.class, "NoSuchAlgorithmException : "+e.getMessage(),e);
            e.printStackTrace();
        } catch (InvalidKeySpecException e) {

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    public static ECPublicKey getPublicKey(byte[] data, Curves curve) {
        ECPublicKey remotePublicKey = null;
        try {
            X509EncodedKeySpec ks = new X509EncodedKeySpec(data);
            KeyFactory kf = KeyFactory.getInstance("EC", curve.kfProvider);
            remotePublicKey = (ECPublicKey)kf.generatePublic(ks);
            
        } catch (NoSuchAlgorithmException e) {
            Logger.error(ECDH.class, "NoSuchAlgorithmException : "+e.getMessage(),e);
            e.printStackTrace();
        } catch (InvalidKeySpecException e) {

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            throw new UnsupportedTypeException(type);
        }
        try {
            KeyFactory kf = KeyFactory.getInstance(type.alg);
            X509EncodedKeySpec xks = new X509EncodedKeySpec(pub);
            return kf.generatePublic(xks);
        } catch (NoSuchAlgorithmException e) {
            throw new Error(e); // Impossible?
        } catch (InvalidKeySpecException e) {
            throw new IllegalArgumentException(e); // Indicates passed in key is bogus
        }

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


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

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


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

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


        if (!pubKey.getW().equals(((ECPublicKey)aKeyPair.getPublic()).getW()))
        {
            System.out.println(" expected " + pubKey.getW().getAffineX() + " got " + ((ECPublicKey)aKeyPair.getPublic()).getW().getAffineX());
            System.out.println(" expected " + pubKey.getW().getAffineY() + " got " + ((ECPublicKey)aKeyPair.getPublic()).getW().getAffineY());

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        if (!Arrays.areEqual(samplePrivEnc, k.getEncoded()))
        {
            fail("private key re-encode failed");
        }


        k = kFact.generatePublic(new X509EncodedKeySpec(samplePubEnc));


        if (!Arrays.areEqual(samplePubEnc, k.getEncoded()))
        {
            fail("public key re-encode failed");
        }

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