code: public static KeyFactory getInstance(String algorithm, String provider)
              throws NoSuchAlgorithmException, NoSuchProviderException {
          Instance instance = GetInstance.getInstance("KeyFactory",
              KeyFactorySpi.class, algorithm, provider);
          return new KeyFactory((KeyFactorySpi)instance.impl,
              instance.provider, algorithm);
      }
docs: Returns a KeyFactory object that converts
  public/private keys of the specified algorithm.
  
  <p> A new KeyFactory object encapsulating the
  KeyFactorySpi implementation from the specified provider
  is returned.  The specified provider must be registered
  in the security provider list.
  
  <p> Note that the list of registered providers may be retrieved via
  the {@link Security#getProviders() Security.getProviders()} method.
  
  @param algorithm the name of the requested key algorithm.
  See the KeyFactory section in the <a href=
  "{@docRoot}openjdk-redirect.html?v=8&path=/technotes/guides/security/StandardNames.html#KeyFactory">
  Java Cryptography Architecture Standard Algorithm Name Documentation</a>
  for information about standard algorithm names.
  
  @param provider the name of the provider.
  
  @return the new KeyFactory object.
  
  @exception NoSuchAlgorithmException if a KeyFactorySpi
  implementation for the specified algorithm is not
  available from the specified provider.
  
  @exception NoSuchProviderException if the specified provider is not
  registered in the security provider list.
  
  @exception IllegalArgumentException if the provider name is null
  or empty.
  
  @see Provider