Java生成RSA非对称型加密的公钥和私钥(利用java API)-Java- startajava.com

import java.io.*; import java.security.*; import javax.crypto.*; import javax.crypto.spec.*; /**//** * <p>Title: RSA非对称型加密的公钥和私钥</p> * <p>Description: </p> * <p>Copyright: Copyright (c) 2003</p> * <p>Company: </p> * @author not attributable * @version 1.0 */ public class KeyRSA ...{ private KeyPairGenerator kpg = null; private KeyPair kp = null; private PublicKey public_key = null; private PrivateKey private_key = null; private FileOutputStream public_file_out = null; private ObjectOutputStream public_object_out = null; private FileOutputStream private_file_out = null; private ObjectOutputStream private_object_out = null; /**//** * 构造函数 * @param in 指定密匙长度（取值范围：512～2048） * @throws NoSuchAlgorithmException 异常 */ public KeyRSA(int in, String address) throws NoSuchAlgorithmException,
FileNotFoundException, IOException ...{ kpg = KeyPairGenerator.getInstance("RSA"); //创建‘密匙对’生成器 kpg.initialize(in); //指定密匙长度（取值范围：512～2048） kp = kpg.genKeyPair(); //生成‘密匙对’，其中包含着一个公匙和一个私匙的信息 public_key = kp.getPublic(); //获得公匙 private_key = kp.getPrivate(); //获得私匙 //保存公匙 public_file_out = new FileOutputStream(address + "/public_key.dat"); public_object_out = new ObjectOutputStream(public_file_out); public_object_out.writeObject(public_key); //保存私匙 private_file_out = new FileOutputStream(address + "/private_key.dat"); private_object_out = new ObjectOutputStream(private_file_out); private_object_out.writeObject(private_key); } public static void main(String[] args) ...{ try ...{ System.out.println("私匙和公匙保存到C盘下的文件中."); new KeyRSA(1024, "c:/"); } catch (IOException ex) ...{ } catch (NoSuchAlgorithmException ex) ...{ } } }