生成公私钥对 java java生成公钥私钥

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import java.io.*;
import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.*;
/**
* RSA非对称型加密的公钥和私钥
* @author 五斗米 
*/
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 {
new KeyRSA(1024,"c:/key_rsa");
}
catch (IOException ex) {
}
catch (NoSuchAlgorithmException ex) {
}
}
}

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