内容简介：Java作为服务端生成一对公私钥，C#作为客户端拥有公钥。RSA算法这里就不多做介绍了，可参考先给出测试代码，后面会有具体的源码。
使用场景
Java作为服务端生成一对公私钥，C#作为客户端拥有公钥。
RSA算法这里就不多做介绍了，可参考 RSA算法介绍
规范
- 公私钥的形式都是base64字符串
- 通过公私钥加密后的字符串也是base64字符串
测试内容
- C#用公钥加密，Java用私钥解密
- Java用私钥加密，C#用公钥解密
测试代码
先给出测试代码，后面会有具体的源码。
首先 Java 作为服务端生成一对公私钥
// 生成一对公私钥
KeyStore keyPair = RSAUtil.createKeys();
System.out.println("公钥：" + keyPair.getPublicKey());
System.out.println("私钥：" + keyPair.getPrivateKey());
公钥
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCnEqBL90TN2naZicQyik333/BjG/f5Ib7P0n5j3O5IxqJwvISbim5Xg94u3UBmserNYPQWQt1Jb/HiAG5alrnwWB1XypRyyilVsARXblv1AtwG4Y5BWvDG0jsipmRj581TQSd1w2Nq6rw/xzUH2xzUx8MLmoJu1RiC1oCEUx1CgQIDAQAB
私钥：
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
- C#客户端，通过公钥加密
加密内容： 你好rsa
RSA rsa = new RSA(); string content = "你好rsa"; string pubKey = @"MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCnEqBL90TN2naZicQyik333/BjG/f5Ib7P0n5j3O5IxqJwvISbim5Xg94u3UBmserNYPQWQt1Jb/HiAG5alrnwWB1XypRyyilVsARXblv1AtwG4Y5BWvDG0jsipmRj581TQSd1w2Nq6rw/xzUH2xzUx8MLmoJu1RiC1oCEUx1CgQIDAQAB"; // 公钥加密 string mi = rsa.EncryptByPublicKey(content, pubKey);
得到加密后的字符串（base64格式）：
cLoDffoAxmu6AirAbwpentv7+LwrpD4UZ1OuGxRuhmao0mm6YhK8O3mkQAD235RJ/XlhK6dK8tp4XsBD4FFSCxcoyrnkdayWrGeWtRXRgYWPIpBrperinPXLt0rNYOvNVHWniewyAmPjrU1wfq7BqLZwYyXEGG9QFI83aZIT9xc=
- Java服务端私钥解密
// 公钥加密后的内容
String mi = "cLoDffoAxmu6AirAbwpentv7+LwrpD4UZ1OuGxRuhmao0mm6YhK8O3mkQAD235RJ/XlhK6dK8tp4XsBD4FFSCxcoyrnkdayWrGeWtRXRgYWPIpBrperinPXLt0rNYOvNVHWniewyAmPjrU1wfq7BqLZwYyXEGG9QFI83aZIT9xc=";
// 私钥
String priKey = "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";
// 解密后的内容
String content = RSAUtil.decryptByPrivateKey(mi, priKey);
System.out.println("你好rsa".equals(content)); // true
至此，公钥加密，私钥解密测试通过。接下来测试Java私钥加密，C#公钥解密
- Java私钥加密
加密内容： 你好rsa
// 私钥 String priKey = "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"; String content = "你好rsa"; String mi = RSAUtil.encryptByPrivateKey(content, priKey); System.out.println(mi);
加密后的内容：
mm8zoUtHvX8nBnCeZQ6k0aPzbmsvgJiIlyG2QIu9bnsO9BikqUpPOU+4UD6pH60TqQuEJFC1Ynv4D2/K2XryfVLYlwNftuO3Ngem5eVwTkYYAeVnDZ7PlHvemuSV7KPNo/erMhVef1rh5avB/PtSP8tKzmMTJ0hQTVILIaRwhq8=
- C#公钥解密
RSA rsa = new RSA();
// Java私钥加密后的内容
string mi = @"mm8zoUtHvX8nBnCeZQ6k0aPzbmsvgJiIlyG2QIu9bnsO9BikqUpPOU+4UD6pH60TqQuEJFC1Ynv4D2/K2XryfVLYlwNftuO3Ngem5eVwTkYYAeVnDZ7PlHvemuSV7KPNo/erMhVef1rh5avB/PtSP8tKzmMTJ0hQTVILIaRwhq8=";
// 公钥
string pubKey = @"MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCnEqBL90TN2naZicQyik333/BjG/f5Ib7P0n5j3O5IxqJwvISbim5Xg94u3UBmserNYPQWQt1Jb/HiAG5alrnwWB1XypRyyilVsARXblv1AtwG4Y5BWvDG0jsipmRj581TQSd1w2Nq6rw/xzUH2xzUx8MLmoJu1RiC1oCEUx1CgQIDAQAB";
// 解密后的内容
string content = rsa.DecryptByPublicKey(mi, pubKey);
Assert.IsTrue("你好rsa" == content); // true
源码
- Java源码
需要apache的commons-codec.jar
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<version>1.11</version>
</dependency>
import org.apache.commons.codec.binary.Base64;
import javax.crypto.Cipher;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
/**
* RSA加解密工具<br>
*/
public class RSAUtil {
public static String RSA_ALGORITHM = "RSA";
public static String UTF8 = "UTF-8";
/**
* 创建公钥私钥
*
* @return
* @throws Exception
*/
public static KeyStore createKeys() throws Exception {
KeyPairGenerator keyPairGeno = KeyPairGenerator.getInstance(RSA_ALGORITHM);
keyPairGeno.initialize(1024);
KeyPair keyPair = keyPairGeno.generateKeyPair();
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
KeyStore keyStore = new KeyStore();
keyStore.setPublicKey(Base64.encodeBase64String(publicKey.getEncoded()));
keyStore.setPrivateKey(Base64.encodeBase64String(privateKey.getEncoded()));
return keyStore;
}
/**
* 获取公钥对象
*
* @param pubKeyData
* @return
* @throws Exception
*/
public static RSAPublicKey getPublicKey(byte[] pubKeyData) throws Exception {
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(pubKeyData);
KeyFactory keyFactory = KeyFactory.getInstance(RSA_ALGORITHM);
return (RSAPublicKey) keyFactory.generatePublic(keySpec);
}
/**
* 获取公钥对象
*
* @param pubKey
* 公钥
* @return
* @throws Exception
*/
public static RSAPublicKey getPublicKey(String pubKey) throws Exception {
return getPublicKey(Base64.decodeBase64(pubKey));
}
/**
* 获取私钥对象
*
* @param priKey
* 私钥
* @return
* @throws Exception
*/
public static RSAPrivateKey getPrivateKey(String priKey) throws Exception {
return getPrivateKey(Base64.decodeBase64(priKey));
}
/**
* 通过私钥byte[]将公钥还原，适用于RSA算法
*
* @param keyBytes
* @return
* @throws Exception
*/
public static RSAPrivateKey getPrivateKey(byte[] keyBytes) throws Exception {
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(RSA_ALGORITHM);
return (RSAPrivateKey) keyFactory.generatePrivate(keySpec);
}
public static String encryptByPublicKey(String data, String publicKey) throws Exception {
return encryptByPublicKey(data, getPublicKey(publicKey));
}
/**
* 公钥加密
*
* @param data
* @param publicKey
* @return
* @throws Exception
*/
public static String encryptByPublicKey(String data, RSAPublicKey publicKey) throws Exception {
Cipher cipher = Cipher.getInstance(RSA_ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
byte[] bytes = cipher.doFinal(data.getBytes(UTF8));
return Base64.encodeBase64String(bytes);
}
public static String decryptByPublicKey(String data, String rsaPublicKey) throws Exception {
return decryptByPublicKey(data, getPublicKey(rsaPublicKey));
}
/**
* 公钥解密
*
* @param data
* @param rsaPublicKey
* @return
* @throws Exception
*/
public static String decryptByPublicKey(String data, RSAPublicKey rsaPublicKey) throws Exception {
Cipher cipher = Cipher.getInstance(RSA_ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, rsaPublicKey);
byte[] inputData = Base64.decodeBase64(data);
byte[] bytes = cipher.doFinal(inputData);
return new String(bytes, UTF8);
}
public static String encryptByPrivateKey(String data, String privateKey) throws Exception {
return encryptByPrivateKey(data, getPrivateKey(privateKey));
}
/**
* 私钥加密
*
* @param data
* @param privateKey
* @return
* @throws Exception
*/
public static String encryptByPrivateKey(String data, RSAPrivateKey privateKey) throws Exception {
Cipher cipher = Cipher.getInstance(RSA_ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, privateKey);
byte[] bytes = cipher.doFinal(data.getBytes(UTF8));
return Base64.encodeBase64String(bytes);
}
public static String decryptByPrivateKey(String data, String privateKey) throws Exception {
return decryptByPrivateKey(data, getPrivateKey(privateKey));
}
/**
* 私钥解密
*
* @param data
* @param privateKey
* @return
* @throws Exception
*/
public static String decryptByPrivateKey(String data, RSAPrivateKey privateKey) throws Exception {
Cipher cipher = Cipher.getInstance(RSA_ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, privateKey);
byte[] inputData = Base64.decodeBase64(data);
byte[] bytes = cipher.doFinal(inputData);
return new String(bytes, UTF8);
}
public static class KeyStore {
private String publicKey;
private String privateKey;
public String getPublicKey() {
return publicKey;
}
public void setPublicKey(String publicKey) {
this.publicKey = publicKey;
}
public String getPrivateKey() {
return privateKey;
}
public void setPrivateKey(String privateKey) {
this.privateKey = privateKey;
}
}
}
- C#源码
需要下载一个组件
下载地址： http://www.bouncycastle.org/csharp/download/bccrypto-csharp-1.8.2-bin.zip
更多详情： http://www.bouncycastle.org/csharp/
下载后添加dll即可
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Security.Cryptography;
using Org.BouncyCastle.Asn1.Pkcs;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Crypto.Generators;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Pkcs;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.Crypto.Engines;
using Org.BouncyCastle.X509;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Crypto.Encodings;
namespace Demo
{
public class RSA
{
private static Encoding Encoding_UTF8 = Encoding.UTF8;
/// <summary>
/// KEY 结构体
/// </summary>
public struct RSAKEY
{
/// <summary>
/// 公钥
/// </summary>
public string PublicKey
{
get;
set;
}
/// <summary>
/// 私钥
/// </summary>
public string PrivateKey
{
get;
set;
}
}
public RSAKEY GetKey()
{
//RSA密钥对的构造器
RsaKeyPairGenerator keyGenerator = new RsaKeyPairGenerator();
//RSA密钥构造器的参数
RsaKeyGenerationParameters param = new RsaKeyGenerationParameters(
Org.BouncyCastle.Math.BigInteger.ValueOf(3),
new Org.BouncyCastle.Security.SecureRandom(),
1024, //密钥长度
25);
//用参数初始化密钥构造器
keyGenerator.Init(param);
//产生密钥对
AsymmetricCipherKeyPair keyPair = keyGenerator.GenerateKeyPair();
//获取公钥和密钥
AsymmetricKeyParameter publicKey = keyPair.Public;
AsymmetricKeyParameter privateKey = keyPair.Private;
SubjectPublicKeyInfo subjectPublicKeyInfo = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(publicKey);
PrivateKeyInfo privateKeyInfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(privateKey);
Asn1Object asn1ObjectPublic = subjectPublicKeyInfo.ToAsn1Object();
byte[] publicInfoByte = asn1ObjectPublic.GetEncoded("UTF-8");
Asn1Object asn1ObjectPrivate = privateKeyInfo.ToAsn1Object();
byte[] privateInfoByte = asn1ObjectPrivate.GetEncoded("UTF-8");
RSAKEY item = new RSAKEY()
{
PublicKey = Convert.ToBase64String(publicInfoByte),
PrivateKey = Convert.ToBase64String(privateInfoByte)
};
return item;
}
private AsymmetricKeyParameter GetPublicKeyParameter(string keyBase64)
{
keyBase64 = keyBase64.Replace("\r", "").Replace("\n", "").Replace(" ", "");
byte[] publicInfoByte = Convert.FromBase64String(keyBase64);
Asn1Object pubKeyObj = Asn1Object.FromByteArray(publicInfoByte);//这里也可以从流中读取，从本地导入
AsymmetricKeyParameter pubKey = PublicKeyFactory.CreateKey(publicInfoByte);
return pubKey;
}
private AsymmetricKeyParameter GetPrivateKeyParameter(string keyBase64)
{
keyBase64 = keyBase64.Replace("\r", "").Replace("\n", "").Replace(" ", "");
byte[] privateInfoByte = Convert.FromBase64String(keyBase64);
// Asn1Object priKeyObj = Asn1Object.FromByteArray(privateInfoByte);//这里也可以从流中读取，从本地导入
// PrivateKeyInfo privateKeyInfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(privateKey);
AsymmetricKeyParameter priKey = PrivateKeyFactory.CreateKey(privateInfoByte);
return priKey;
}
/// <summary>
/// 私钥加密
/// </summary>
/// <param name="data">加密内容</param>
/// <param name="privateKey">私钥（Base64后的）</param>
/// <returns>返回Base64内容</returns>
public string EncryptByPrivateKey(string data, string privateKey)
{
//非对称加密算法，加解密用
IAsymmetricBlockCipher engine = new Pkcs1Encoding(new RsaEngine());
//加密
try
{
engine.Init(true, GetPrivateKeyParameter(privateKey));
byte[] byteData = Encoding_UTF8.GetBytes(data);
var ResultData = engine.ProcessBlock(byteData, 0, byteData.Length);
return Convert.ToBase64String(ResultData);
//Console.WriteLine("密文（base64编码）:" + Convert.ToBase64String(testData) + Environment.NewLine);
}
catch (Exception ex)
{
throw ex;
}
}
/// <summary>
/// 私钥解密
/// </summary>
/// <param name="data">待解密的内容</param>
/// <param name="privateKey">私钥（Base64编码后的）</param>
/// <returns>返回明文</returns>
public string DecryptByPrivateKey(string data, string privateKey)
{
data = data.Replace("\r", "").Replace("\n", "").Replace(" ", "");
//非对称加密算法，加解密用
IAsymmetricBlockCipher engine = new Pkcs1Encoding(new RsaEngine());
//解密
try
{
engine.Init(false, GetPrivateKeyParameter(privateKey));
byte[] byteData = Convert.FromBase64String(data);
var ResultData = engine.ProcessBlock(byteData, 0, byteData.Length);
return Encoding_UTF8.GetString(ResultData);
}
catch (Exception ex)
{
throw ex;
}
}
/// <summary>
/// 公钥加密
/// </summary>
/// <param name="data">加密内容</param>
/// <param name="publicKey">公钥（Base64编码后的）</param>
/// <returns>返回Base64内容</returns>
public string EncryptByPublicKey(string data, string publicKey)
{
//非对称加密算法，加解密用
IAsymmetricBlockCipher engine = new Pkcs1Encoding(new RsaEngine());
//加密
try
{
engine.Init(true, GetPublicKeyParameter(publicKey));
byte[] byteData = Encoding_UTF8.GetBytes(data);
var ResultData = engine.ProcessBlock(byteData, 0, byteData.Length);
return Convert.ToBase64String(ResultData);
}
catch (Exception ex)
{
throw ex;
}
}
/// <summary>
/// 公钥解密
/// </summary>
/// <param name="data">待解密的内容</param>
/// <param name="publicKey">公钥（Base64编码后的）</param>
/// <returns>返回明文</returns>
public string DecryptByPublicKey(string data, string publicKey)
{
data = data.Replace("\r", "").Replace("\n", "").Replace(" ", "");
//非对称加密算法，加解密用
IAsymmetricBlockCipher engine = new Pkcs1Encoding(new RsaEngine());
//解密
try
{
engine.Init(false, GetPublicKeyParameter(publicKey));
byte[] byteData = Convert.FromBase64String(data);
var ResultData = engine.ProcessBlock(byteData, 0, byteData.Length);
return Encoding_UTF8.GetString(ResultData);
}
catch (Exception ex)
{
throw ex;
}
}
}
}
此外还可以C#做服务端生成公私钥，Java做客户端。原理是一样的，这里就不测试了，读者可以自行实现。
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QBasic语言程序设计教程(第2版习题解答)
刘瑞新、丁爱萍 / 电子工业出版社 / 1999-6-1 / 13.00
本书是《QBasic语言程序设计教程》（第二版）一书的配套教材、本书第一部分以概要的形式，对全书进行了总结，以便学生复习。在第二部分中，对《QBasic语言程序设计教程》（第二版）中的习题做了详尽的分析与解答。 本书也可作为QBasic语言的习题研单独使用。一起来看看 《QBasic语言程序设计教程(第2版习题解答)》 这本书的介绍吧!
