因为 RSA 加密的代码都是比较通用的，所以没有特意去整合，这里参照着两位大神的代码重新写了一遍，做了一些简单的修改，符合本地运行环境
服务端代参照：
客户端代码参照：
JS加密依赖：jsencrypt.jsGithub地址：可客户端尽量依赖JAVA自带的Jar，只是Base64加密的时候额外依赖了apache的工具类commons-net-3.3.jar
服务端工RSA工具类
package com.wzh.config.utils;
import org.apache.commons.net.util.Base64;
import org.apache.log4j.Logger;
import javax.crypto.Cipher;
import java.io. byte ArrayOutputStream;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;
/**
* <RSA加密解密工具类>
* <额外依赖 commons-net-3.3.jar,日志用的log4j，如果是其他的日志框架可以更改>
* @author wzh
* @version 2018-12-16 18:20
* @see [相关类/方法] (可选)
**/public class RsaUtils
{
private static Logger log = Logger.getLogger(RsaUtils.class);
/**
* 块加密大小
*/ private static final int cache _SIZE = 1024;
/**
* 加密算法RSA
*/ public static final String KEY_ALGORITHM = "RSA";
/**
* 签名算法
*/ public static final String SIGNATURE_ALGORITHM = "MD5withRSA";
/**
* 获取公钥的key
*/ private static final String PUBLIC_KEY = "RsaPublicKey";
/**
* 获取 私钥 的key
*/ private static final String PRIVATE_KEY = "RsaPrivateKey";
/**
* RSA最大加密明文大小
*/ private static final int MAX_ENCRYPT_BLOCK = 117;
/**
* RSA最大解密密文大小
*/ private static final int MAX_DECRYPT_BLOCK = 128;
/**
* Base64 字符串 解码为二进制数据
* @param base64
* @return 二进制数据
* @throws Exception
*/ public static byte[] decodeBase64(String base64)
throws Exception
{
return Base64.decodeBase64(base64.get bytes ());
}
/**
* 二进制数据编码为Base64字符串
* @param bytes
* @return Base64字符串
* @throws Exception
*/ public static String encodeBase64(byte[] bytes)
throws Exception
{
return new String(Base64.encodeBase64(bytes));
}
/**
* 生成秘钥对
* @return 返回公钥和私钥的Map集合
* @throws Exception
*/ public static Map<String, Object> initKeyPair()
throws Exception
{
KeyPairGenerator keyPairGen = KeyPairGenerator. getInstance (KEY_ALGORITHM);
keyPairGen.initialize(CACHE_SIZE);
KeyPair keyPair = keyPairGen.generateKeyPair();
RSAPublicKey publicKey = (RSAPublicKey)keyPair.getPublic();
RSAPrivateKey privateKey = (RSAPrivateKey)keyPair.getPrivate();
Map<String, Object> keyMap = new HashMap<String, Object>(2);
// 公钥
keyMap.put(PUBLIC_KEY, publicKey);
// 私钥
keyMap.put(PRIVATE_KEY, privateKey);
return keyMap;
}
/**
* 获取私钥
* @param keyMap 秘钥对Map
* @return 私钥字符串
* @throws Exception
*/ public static String getPrivateKey(Map<String, Object> keyMap) throws Exception {
Key key = (Key) keyMap.get(PRIVATE_KEY);
return encodeBase64(key.getEncoded());
}
/**
* 获取公钥字符串
* @param keyMap 秘钥对Map
* @return 公钥字符串
* @throws Exception
*/ public static String getPublicKey(Map<String, Object> keyMap) throws Exception {
Key key = (Key) keyMap.get(PUBLIC_KEY);
return encodeBase64(key.getEncoded());
}
/**
* 使用私钥生成数字签名
* @param data 使用私钥加密的数据
* @param privateKey 是哟啊字符串
* @return 数字签名
* @throws Exception
*/ public static String sign(byte[] data, String privateKey) throws Exception {
// 获取byte数组
byte[] keyBytes = decodeBase64(privateKey);
// 构造PKCS8EncodedKeySpec对象
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
// 指定的加密算法
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
// 取私钥匙对象
PrivateKey privateK = keyFactory.generatePrivate(pkcs8KeySpec);
// 用私钥对信息生成数字签名
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
signature.initSign(privateK);
signature.update(data);
return encodeBase64(signature.sign());
}
/**
* 校验数字签名
* @param data 私钥加密的数据
* @param publicKey 公钥字符串
* @param sign 私钥生成的签名
* @return 校验成功返回true 失败返回false
* @throws Exception
*/ public static boolean verify(byte[] data, String publicKey, String sign) throws Exception {
// 获取byte数组
byte[] keyBytes = decodeBase64(publicKey);
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
// 构造X509EncodedKeySpec对象
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
// 指定的加密算法
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
// 取公钥匙对象
PublicKey publicK = keyFactory.generatePublic(keySpec);
signature.initVerify(publicK);
signature.update(data);
// 验证签名是否正常
return signature.verify(decodeBase64(sign));
}
/**
* 私钥加密
* @param data 需要加密的数据
* @param privateKey 私钥
* @return 加密后的数据
* @throws Exception
*/ public static byte[] encryptByPrivateKey(byte[] data, String privateKey) throws Exception {
byte[] keyBytes = decodeBase64(privateKey);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, privateK);
int inputLen = data.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 对数据分段加密
while (inputLen - offSet > 0) {
if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
} else {
cache = cipher.doFinal(data, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_ENCRYPT_BLOCK;
}
byte[] encryptedData = out.toByteArray();
out.close();
return encryptedData;
}
/**
* 公钥加密
* @param data 需要加密的数据
* @param publicKey 公钥字符串
* @return 加密后的数据
* @throws Exception
*/ public static byte[] encryptByPublicKey(byte[] data, String publicKey) throws Exception {
byte[] keyBytes = decodeBase64(publicKey);
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key publicK = keyFactory.generatePublic(x509KeySpec);
// 对数据加密
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, publicK);
int inputLen = data.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 对数据分段加密
while (inputLen - offSet > 0) {
if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
} else {
cache = cipher.doFinal(data, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_ENCRYPT_BLOCK;
}
byte[] encryptedData = out.toByteArray();
out.close();
return encryptedData;
}
/**
* 私钥解密
* @param encryptedData 公钥加密的数据
* @param privateKey 私钥字符串
* @return 私钥解密的数据
* @throws Exception
*/ public static byte[] decryptByPrivateKey(byte[] encryptedData, String privateKey) throws Exception {
byte[] keyBytes = decodeBase64(privateKey);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, privateK);
int inputLen = encryptedData.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 对数据分段解密
while (inputLen - offSet > 0) {
if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
} else {
cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_DECRYPT_BLOCK;
}
byte[] decryptedData = out.toByteArray();
out.close();
return decryptedData;
}
/**
* 公钥解密
* @param encryptedData 私钥加密的数据
* @param publicKey 公钥字符串
* @return 公钥解密的数据
* @throws Exception
*/ public static byte[] decryptByPublicKey(byte[] encryptedData, String publicKey) throws Exception {
byte[] keyBytes = decodeBase64(publicKey);
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key publicK = keyFactory.generatePublic(x509KeySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, publicK);
int inputLen = encryptedData.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 对数据分段解密
while (inputLen - offSet > 0) {
if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
} else {
cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_DECRYPT_BLOCK;
}
byte[] decryptedData = out.toByteArray();
out.close();
return decryptedData;
}
/**
* 公钥加密方法
* @param data 需加密的字符串
* @param PUBLICKEY 公钥字符串
* @return 加密后的字符串
*/ public static String encryptedDataByPublic(String data, String PUBLICKEY) {
try {
data = encodeBase64(encryptByPublicKey(data.getBytes(), PUBLICKEY));
} catch (Exception e) {
e.printStackTrace();
log.error(e.getMessage(),e);
}
return data;
}
/**
* 私钥解密方法
* @param data 公钥加密的字符串
* @param PRIVATEKEY 私钥字符串
* @return 私钥解密的字符串
*/ public static String decryptDataByPrivate(String data, String PRIVATEKEY) {
String temp = "";
try {
byte[] rs = decodeBase64(data);
//以utf-8的方式生成字符串
temp = new String(decryptByPrivateKey(rs, PRIVATEKEY),"UTF-8");
} catch (Exception e) {
e.printStackTrace();
}
return temp;
}
public static void main(String[] args) {
try {
Map<String, Object> keyMap = RsaUtils.initKeyPair();
String publicKey = RsaUtils.getPublicKey(keyMap);
String privateKey = RsaUtils.getPrivateKey(keyMap);
System.out.println("公钥：" + publicKey);
System.out.println("私钥：" + privateKey);
String source = "我是需要私钥加密的字符串！";
System.out.println("签名验证逻辑，私钥加密--公钥解密，需要加密的字符串：" + source);
byte[] data = source.getBytes();
byte[] encodedData = RsaUtils.encryptByPrivateKey(data, privateKey);
System.out.println("私钥加密后：" + new String(encodedData));
String sign = RsaUtils.sign(encodedData, privateKey);
System.out.println("签名:" + sign);
boolean status = RsaUtils.verify(encodedData, publicKey, sign);
System.out.println("验证结果:" + status);
byte[] decodedData = RsaUtils.decryptByPublicKey(encodedData, publicKey);
String target = new String(decodedData);
System.out.println("公钥解密私钥加密的数据:" + target);
System.out.println("---------公钥加密----私钥解密----------");
// 这里尽量长一点，复制了一段歌词
String msg = "月溅星河，长路漫漫，风烟残尽，独影阑珊；谁叫我身手不凡，谁让我爱恨两难，到后来，" +
"肝肠寸断。幻世当空，恩怨休怀，舍悟离迷，六尘不改；且怒且悲且狂哉，是人是鬼是妖怪，不过是，" +
"心有魔债。叫一声佛祖，回头无岸，跪一人为师，生死无关；善恶浮世真假界,尘缘散聚不分明，难断！" +
"我要这铁棒有何用，我有这变化又如何；还是不安，还是氐惆，金箍当头，欲说还休。我要这铁棒醉舞魔，" +
"我有这变化乱迷浊；踏碎灵霄，放肆桀骜，世恶道险，终究难逃。";
String ecodeMsg = RsaUtils.encryptedDataByPublic(msg,publicKey);
System.out.println("加密后的歌词：" + ecodeMsg);
String decodeMsg = RsaUtils.decryptDataByPrivate(ecodeMsg,privateKey);
System.out.println("解密后的歌词：" + decodeMsg);
} catch (Exception e) {
e.printStackTrace();
}
}
}
首先测试一下工具类，main函数跑一下，成功验证签名，加密，解密
image.png
客户端JS代码，需要JSEncrypt库，前文有给出github地址，这里对这个库做一个简单的扩展，因为RSA长文本超过秘钥长度要报错，所以需要扩展修改下
/**
* ---------------------------
* 此JS需加载JSEncrypt库的后面，加密解密调用着两个方法
* ---------------------------
*/
/**
* 长文本加密
* @param {string} string 待加密长文本
* @returns {string} 加密后的base64编码
* */JSEncrypt.prototype.encryptLong = function (string) {
var k = this.getKey();
try {
var ct = "";
//RSA每次加密117bytes，需要辅助方法判断字符串截取位置
//1.获取字符串截取点
var bytes = new Array();
bytes.push(0);
var byteNo = 0;
var len, c;
len = string.length;
var temp = 0;
for (var i = 0; i < len; i++) {
c = string.charCodeAt(i);
if (c >= 0x010000 && c <= 0x10FFFF) { //特殊字符，如Ř，Ţ
byteNo += 4;
} else if (c >= 0x000800 && c <= 0x00FFFF) { //中文以及标点符号
byteNo += 3;
} else if (c >= 0x000080 && c <= 0x0007FF) { //特殊字符，如È，Ò
byteNo += 2;
} else { // 英文以及标点符号
byteNo += 1;
}
if ((byteNo % 117) >= 114 || (byteNo % 117) == 0) {
if (byteNo - temp >= 114) {
bytes.push(i);
temp = byteNo;
}
}
}
//2.截取字符串并分段加密
if (bytes.length > 1) {
for (var i = 0; i < bytes.length - 1; i++) {
var str;
if (i == 0) {
str = string.substring(0, bytes[i + 1] + 1);
} else {
str = string.substring(bytes[i] + 1, bytes[i + 1] + 1);
}
var t1 = k.encrypt(str);
ct += t1;
}
;
if (bytes[bytes.length - 1] != string.length - 1) {
var lastStr = string.substring(bytes[bytes.length - 1] + 1);
ct += k.encrypt(lastStr);
}
return hex2b64(ct);
}
var t = k.encrypt(string);
var y = hex2b64(t);
return y;
} catch (ex) {
console.log(ex);
return false;
}
};
/**
* 长文本解密
* @param {string} string 加密后的base64编码
* @returns {string} 解密后的原文
* */JSEncrypt.prototype.decryptLong = function (string) {
var k = this.getKey();
var maxLength = 128;
try {
var string = b64tohex(string);
var ct = "";
if (string.length > maxLength * 2) {
var lt = string.match(/.{1,256}/g); //128位解密。取256位
lt.forEach(function (entry) {
var t1 = k.decrypt(entry);
ct += t1;
});
return ct;
}
var y = k.decrypt(string);
return y;
} catch (ex) {
return false;
}
};
function hex2b64(h) {
var b64map="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var b64padchar="=";
var i;
var c;
var ret = "";
for(i = 0; i+3 <= h.length; i+=3) {
c = parseInt(h.substring(i,i+3),16);
ret += b64map.charAt(c >> 6) + b64map.charAt(c & 63);
}
if(i+1 == h.length) {
c = parseInt(h.substring(i,i+1),16);
ret += b64map.charAt(c << 2);
}
else if(i+2 == h.length) {
c = parseInt(h.substring(i,i+2),16);
ret += b64map.charAt(c >> 2) + b64map.charAt((c & 3) << 4);
}
while((ret.length & 3) > 0) ret += b64padchar;
return ret;
}
一个简单的测试页面，就不做前后台衔接了，只是在前提用后台生成的公钥进行加密，然后后台main方法解密一下。
<!DOCTYPE html>
<html>
<head>
<title>MyHtml.html</title>
<meta name="keywords" content="keyword1,keyword2,keyword3">
<meta name="description" content="this is my page">
<meta name="content-type" content="text/html; charset=UTF-8">
<script src="${request.contextPath}/js/jquery-3.3.1.min.js"></script>
<script src="${request.contextPath}/js/jsencrypt.js?v=123"></script>
<script src="${request.contextPath}/js/RsaJs.js?v=321123"></script>
<script type="text/javascript">
$(function() {
$('#submit').click(function() {
var data = $('#msg').val();
// 公钥
var publickey = $('#publickey').val();
// 使用jsencrypt库加密前端参数
var jsencrypt = new JSEncrypt();
jsencrypt.setPublicKey(publickey);
// 这里调用长文本的加密方法
var ecodeMsg = jsencrypt.encryptLong(data);
$('#ecodeMsg').val(ecodeMsg);
});
});
</script>
</head>
<body>
需要加密的内容:</br><textarea id="msg" name="msg" rows="10" cols="60"></textarea></br>
公钥:</br><textarea id="publickey" rows="10" cols="60"></textarea></br>
密文:</br><textarea id="ecodeMsg" rows="10" cols="60"></textarea>
<br/>
<br/>
<input id="submit" type="button" value="加密" />
</body>
</body>
</html>
简单的测试，页面获取密文
image.png
后台main解密一下
import com.wzh.config.utils.RsaUtils;
/**
* <一句话功能描述>
* <功能详细描述>
* @author wzh
* @version 2018-12-16 23:31
* @see [相关类/方法] (可选)
**/public class RsaManTest {
public static void main(String[] args) {
String msg = RsaUtils.decryptDataByPrivate("XsM6CYaNhdx2pJXebCgl3g3pF7FX9KrPY+gtwgbQs0Q1mqJL4VHqQytxOJfUwXHLP/hLck80AWSctJ29/dB4IQ2mSbcO4OInAJMkPwqWsnh1E9bFlFP2KjQ5RBVngb//IiSgBSFo8NR00y1/h47CrNch6ljW1nCLG82Qk2olhfI=",
"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");
System.out.println(msg);
}
}
前台加密，后台解密成功
