Examples of java.security.KeyFactory

java.security.KeyFactory
Key factories are used to convert keys (opaque cryptographic keys of type Key) into key specifications (transparent representations of the underlying key material), and vice versa.
Key factories are bi-directional. That is, they allow you to build an opaque key object from a given key specification (key material), or to retrieve the underlying key material of a key object in a suitable format.
Multiple compatible key specifications may exist for the same key. For example, a DSA public key may be specified using DSAPublicKeySpec or X509EncodedKeySpec. A key factory can be used to translate between compatible key specifications.
The following is an example of how to use a key factory in order to instantiate a DSA public key from its encoding. Assume Alice has received a digital signature from Bob. Bob also sent her his public key (in encoded format) to verify his signature. Alice then performs the following actions:
```
 X509EncodedKeySpec bobPubKeySpec = new X509EncodedKeySpec(bobEncodedPubKey); KeyFactory keyFactory = KeyFactory.getInstance("DSA"); PublicKey bobPubKey = keyFactory.generatePublic(bobPubKeySpec); Signature sig = Signature.getInstance("DSA"); sig.initVerify(bobPubKey); sig.update(data); sig.verify(signature); 
```
@author Jan Luehe @version 1.35, 04/21/06 @see Key @see PublicKey @see PrivateKey @see java.security.spec.KeySpec @see java.security.spec.DSAPublicKeySpec @see java.security.spec.X509EncodedKeySpec @since 1.2

    }
    return privateKey;
  }


  private static KeyFactory getKeyFactory() {
    KeyFactory keyFactory;
    try {
      keyFactory = KeyFactory.getInstance(ALGORITHM);
    } catch (NoSuchAlgorithmException e) {
      throw new IllegalStateException("Error loading RSA provider", e);
    }

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        e = ((javax.crypto.interfaces.DHPublicKey) kp.getPublic()).getY();
    }


    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());
    }

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                throw new InvalidKeyException();
            ECPublicKey pubK = getPublicKey(pub, curve);


            pri = Base64.decode(sfs.get("pri"));
            PKCS8EncodedKeySpec ks = new PKCS8EncodedKeySpec(pri);
            KeyFactory kf = KeyFactory.getInstance("EC", curve.kfProvider);
            ECPrivateKey privK = (ECPrivateKey) kf.generatePrivate(ks);


            this.key = new KeyPair(pubK, privK);
        } catch (Exception e) {
            throw new FSParseException(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(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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    public static PublicKey getPublicKey(KeyPairType type, byte[] pub){
        if(type.equals(KeyPairType.DSA)){
            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 static KeyPair getKeyPair(KeyPairType type, byte[] pub, byte[] pri) {
        if(type.equals(KeyPairType.DSA)){
            throw new UnsupportedTypeException(type);
        }
        try {
            KeyFactory kf = KeyFactory.getInstance(type.alg);


            PublicKey pubK = getPublicKey(type, pub);


            PKCS8EncodedKeySpec pks = new PKCS8EncodedKeySpec(pri);
            PrivateKey privK = kf.generatePrivate(pks);
            // FIXME verify that the keys are consistent if assertions/logging enabled??


            return getKeyPair(pubK, privK);
        } catch (UnsupportedTypeException e) {
            throw new Error(e); // Should be impossible

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        try {
            byte[] keyBytes = new byte[inStream.available()];
            inStream.read(keyBytes);


            PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            PrivateKey key = (RSAPrivateKey) keyFactory.generatePrivate(keySpec);


            Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
            cipher.init(Cipher.DECRYPT_MODE, key);


            byte[] textBytes = cipher.doFinal(Certificate.stringToBytes(body));

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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");
        }


        if (!((DHPublicKey)aKeyPair.getPublic()).getY().equals(pubKey.getY()))
        {
            fail(size + " bit public key encoding/decoding test failed on y value");
        }


        //
        // public key serialisation test
        //
        pubKey = (DHPublicKey)serializeDeserialize(aKeyPair.getPublic());
        spec = pubKey.getParams();


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


        if (!((DHPublicKey)aKeyPair.getPublic()).getY().equals(pubKey.getY()))
        {
            fail(size + " bit public key serialisation test failed on y value");
        }


        if (!aKeyPair.getPublic().equals(pubKey))
        {
            fail("equals test failed");
        }


        if (aKeyPair.getPublic().hashCode() != pubKey.hashCode())
        {
            fail("hashCode test failed");
        }


        //
        // private key encoding test
        //
        byte[]              privEnc = aKeyPair.getPrivate().getEncoded();
        PKCS8EncodedKeySpec privPKCS8 = new PKCS8EncodedKeySpec(privEnc);
        DHPrivateKey        privKey = (DHPrivateKey)keyFac.generatePrivate(privPKCS8);


        spec = privKey.getParams();


        if (!spec.getG().equals(dhParams.getG()) || !spec.getP().equals(dhParams.getP()))
        {

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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");
        }


        if (!((DHPublicKey)aKeyPair.getPublic()).getY().equals(pubKey.getY()))
        {
            fail(size + " bit public key encoding/decoding test failed on y value");
        }


        //
        // public key serialisation test
        //
        ByteArrayOutputStream   bOut = new ByteArrayOutputStream();
        ObjectOutputStream      oOut = new ObjectOutputStream(bOut);


        oOut.writeObject(aKeyPair.getPublic());


        ByteArrayInputStream   bIn = new ByteArrayInputStream(bOut.toByteArray());
        ObjectInputStream      oIn = new ObjectInputStream(bIn);


        pubKey = (DHPublicKey)oIn.readObject();
        spec = pubKey.getParams();


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


        if (!((DHPublicKey)aKeyPair.getPublic()).getY().equals(pubKey.getY()))
        {
            fail(size + " bit public key serialisation test failed on y value");
        }


        //
        // private key encoding test
        //
        byte[]              privEnc = aKeyPair.getPrivate().getEncoded();
        PKCS8EncodedKeySpec privPKCS8 = new PKCS8EncodedKeySpec(privEnc);
        DHPrivateKey        privKey = (DHPrivateKey)keyFac.generatePrivate(privPKCS8);


        spec = privKey.getParams();


        if (!spec.getG().equals(dhParams.getG()) || !spec.getP().equals(dhParams.getP()))
        {

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