如何在Java中以非对称加密生成密钥对？

我试图在Java中以非对称加密生成密钥对，但出现invalid key exception错误，它说No installed provider supports this key: sun.security.rsa.RSAPrivateCrtKeyImpl。

private static byte[] encrypt(byte[] inpBytes, PrivateKey prvk,
      String xform) throws Exception {
    Cipher cipher = Cipher.getInstance(xform);
    cipher.init(Cipher.ENCRYPT_MODE, prvk);
    return cipher.doFinal(inpBytes);
}

@Override
public byte[] uploadFile(byte[] data, String name, String file, int size)
      throws RemoteException {
    // TODO Auto-generated method stub
    byte[] keyss=null;
    try {
        OutputStream out =
          new FileOutputStream(new File("C:\\Users\\Amaresh\\Documents\\Cloud\\"
          + name + "\\" + file));
        String xform = "DES/CTR/NoPadding";
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA"); // Original
        kpg.initialize(1024); // 512 is the keysize.//try 1024 biit
        KeyPair kp = kpg.genKeyPair();
        PublicKey pubk = kp.getPublic();
        PrivateKey prvk = kp.getPrivate();
        keyss = pubk.getEncoded();
        byte[] encBytes = encrypt(data, prvk, xform);
        System.out.println("Keypair generated");
        out.write(encBytes, 0, encBytes.length);
        out.close();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (NoSuchAlgorithmException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (NoSuchProviderException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return keyss;
}

我只想进行非对称加密，即使用私钥加密数据并存储公钥以对其进行解密。我是一个初学者，对我的直率错误感到抱歉。