Here you can find the source of generateKeyPair(int keySize)
public static KeyPair generateKeyPair(int keySize) throws Exception
//package com.java2s; /*//from ww w . j a v a 2s .c om * Copyright 2004 - 2012 Cardiff University. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.security.*; public class Main { private static final String providerName = "BC"; public static KeyPair generateKeyPair(int keySize) throws Exception { KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA", providerName); generator.initialize(keySize); return generator.generateKeyPair(); } public static KeyPair generateKeyPair() throws Exception { return generateKeyPair(1024); } }