RSA加解密过程

package com.pff.pff;

import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

import javax.crypto.Cipher;

import org.apache.commons.codec.binary.Hex;

public class Rsa {
    private static String test = "pff";

    public static void main(String[] args) {
        try {
            // 生成公私秘钥
            KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
            KeyPair generateKeyPair = keyPairGenerator.generateKeyPair();
            PrivateKey private1 = generateKeyPair.getPrivate();
            PublicKey public1 = generateKeyPair.getPublic();
            byte[] encoded1 = private1.getEncoded();
            byte[] encoded2 = public1.getEncoded();
            System.out.println("得到的私钥= " + Hex.encodeHexString(encoded1));
            System.out.println("得到的公钥= " + Hex.encodeHexString(encoded2));
            // 转换得到私钥
            PKCS8EncodedKeySpec pKCS8EncodedKeySpec = new PKCS8EncodedKeySpec(encoded1);
            KeyFactory instance = KeyFactory.getInstance("RSA");
            PrivateKey generatePrivate = instance.generatePrivate(pKCS8EncodedKeySpec);
            // 转换得到公钥
            X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(encoded2);
            PublicKey generatePublic = instance.generatePublic(x509EncodedKeySpec);
            // 私钥加密过程
            Cipher cipher = Cipher.getInstance("RSA");
            cipher.init(Cipher.ENCRYPT_MODE, generatePrivate);
            byte[] doFinal1 = cipher.doFinal(test.getBytes());
            System.out.println("私钥加密结果= " + Hex.encodeHexString(doFinal1));
            // 私钥解密过程
            cipher.init(Cipher.DECRYPT_MODE, generatePublic);
            byte[] doFinal2 = cipher.doFinal(doFinal1);
            System.out.println("公钥解密结果= " + new String(doFinal2));
            // 公钥加密
            cipher.init(Cipher.ENCRYPT_MODE, generatePublic);
            byte[] doFinal3 = cipher.doFinal(test.getBytes());
            System.out.println("公钥加密结果= " + Hex.encodeHexString(doFinal3));
            // 私钥解密
            cipher.init(Cipher.DECRYPT_MODE, generatePrivate);
            byte[] doFinal4 = cipher.doFinal(doFinal3);
            System.out.println("公钥解密结果= " + new String(doFinal4));
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

}