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RSAUtil.java
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import javax.crypto.Cipher;
import org.apache.commons.codec.binary.Base64;
public class RSAUtil {
private static String KEY_RSA_TYPE = "RSA";
private static int KEY_SIZE = 1024;//JDK方式RSA加密最大只有1024位
private static int ENCODE_PART_SIZE = KEY_SIZE/8;
public static final String PUBLIC_KEY_NAME = "public";
public static final String PRIVATE_KEY_NAME = "private";
//私钥
public static final String privatekey = "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";
//公钥
public static final String publickey="MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCPaTy+1JVZoLTQdDg2PMZ3rzlDqzmL+WKd5AqPYfFg1GNQ802qAUDWJu+Jij0zBy+FAqxxXazwess06SUr1v2RpcwpqRyHhNi1N4Pwfas4WuHiwRqIZIYUYbm8eX2WiLwbAZsDlJdAwmjR4iIrAo+QciRjXpPL8Ns/Nqay5L2nPwIDAQAB";
/**
* 创建公钥秘钥
* @return
*/
public static Map<String,String> createRSAKeys(){
Map<String,String> keyPairMap = new HashMap<>();//里面存放公私秘钥的Base64位加密
try {
KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(KEY_RSA_TYPE);
keyPairGenerator.initialize(KEY_SIZE,new SecureRandom());
KeyPair keyPair = keyPairGenerator.generateKeyPair();
//随机获取公钥秘钥
//String publicKeyValue = Base64.encodeBase64String(keyPair.getPublic().getEncoded());
//String privateKeyValue = Base64.encodeBase64String(keyPair.getPrivate().getEncoded());
String publicKeyValue = publickey;
String privateKeyValue = privatekey;
//存入公钥秘钥，以便以后获取
keyPairMap.put(PUBLIC_KEY_NAME,publicKeyValue);
keyPairMap.put(PRIVATE_KEY_NAME,privateKeyValue);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return keyPairMap;
}
/**
* 公钥加密
* 描述：
* 1字节 = 8位；
* 最大加密长度如 1024位私钥时，最大加密长度为 128-11 = 117字节，不管多长数据，加密出来都是 128 字节长度。
* @param sourceStr
* @param publicKeyBase64Str
* @return
*/
public static String encode(String sourceStr){
byte [] publicBytes = Base64.decodeBase64(publickey);
//公钥加密
X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(publicBytes);
List<byte[]> alreadyEncodeListData = new LinkedList<>();
int maxEncodeSize = ENCODE_PART_SIZE - 11;
String encodeBase64Result = null;
try {
KeyFactory keyFactory = KeyFactory.getInstance(KEY_RSA_TYPE);
PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);
Cipher cipher = Cipher.getInstance(KEY_RSA_TYPE);
cipher.init(Cipher.ENCRYPT_MODE,publicKey);
byte[] sourceBytes = sourceStr.getBytes("utf-8");
int sourceLen = sourceBytes.length;
for(int i=0;i<sourceLen;i+=maxEncodeSize){
int curPosition = sourceLen - i;
int tempLen = curPosition;
if(curPosition > maxEncodeSize){
tempLen = maxEncodeSize;
}
byte[] tempBytes = new byte[tempLen];//待加密分段数据
System.arraycopy(sourceBytes,i,tempBytes,0,tempLen);
byte[] tempAlreadyEncodeData = cipher.doFinal(tempBytes);
alreadyEncodeListData.add(tempAlreadyEncodeData);
}
int partLen = alreadyEncodeListData.size();//加密次数
int allEncodeLen = partLen * ENCODE_PART_SIZE;
byte[] encodeData = new byte[allEncodeLen];//存放所有RSA分段加密数据
for (int i = 0; i < partLen; i++) {
byte[] tempByteList = alreadyEncodeListData.get(i);
System.arraycopy(tempByteList,0,encodeData,i*ENCODE_PART_SIZE,ENCODE_PART_SIZE);
}
encodeBase64Result = Base64.encodeBase64String(encodeData);
} catch (Exception e) {
e.printStackTrace();
}
return encodeBase64Result;
}
/**
* 私钥解密
* @param sourceBase64RSA
* @param privateKeyBase64Str
*/
public static String decode(String sourceBase64RSA){
byte[] privateBytes = Base64.decodeBase64(privatekey);
byte[] encodeSource = Base64.decodeBase64(sourceBase64RSA);
int encodePartLen = encodeSource.length/ENCODE_PART_SIZE;
List<byte[]> decodeListData = new LinkedList<>();//所有解密数据
String decodeStrResult = null;
//私钥解密
PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(privateBytes);
try {
KeyFactory keyFactory = KeyFactory.getInstance(KEY_RSA_TYPE);
PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
Cipher cipher = Cipher.getInstance(KEY_RSA_TYPE);
cipher.init(Cipher.DECRYPT_MODE,privateKey);
int allDecodeByteLen = 0;//初始化所有被解密数据长度
for (int i = 0; i < encodePartLen; i++) {
byte[] tempEncodedData = new byte[ENCODE_PART_SIZE];
System.arraycopy(encodeSource,i*ENCODE_PART_SIZE,tempEncodedData,0,ENCODE_PART_SIZE);
byte[] decodePartData = cipher.doFinal(tempEncodedData);
decodeListData.add(decodePartData);
allDecodeByteLen += decodePartData.length;
}
byte [] decodeResultBytes = new byte[allDecodeByteLen];
for (int i = 0,curPosition = 0; i < encodePartLen; i++) {
byte[] tempSorceBytes = decodeListData.get(i);
int tempSourceBytesLen = tempSorceBytes.length;
System.arraycopy(tempSorceBytes,0,decodeResultBytes,curPosition,tempSourceBytesLen);
curPosition += tempSourceBytesLen;
}
decodeStrResult = new String(decodeResultBytes,"UTF-8");
}catch (Exception e){
e.printStackTrace();
}
return decodeStrResult;
}
}
Servlet
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class Jsencrypt
*/
@WebServlet("/Jsencrypt")
public class Jsencrypt extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public Jsencrypt() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.getWriter().append("Served at: ").append(request.getContextPath());
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
//doGet(request, response);
String data=request.getParameter("data");
response.getWriter().print(RSAUtil.decode(data)); //返回解密字段
}
}
index.html
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<script type="text/javascript"
src="https://www.idaobin.com/js/jquery-3.2.1.js"></script>
<script type="text/javascript"
src="https://www.idaobin.com/test/jsencrypt.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {
$("#btn").click(function() {
//公钥
var publickey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCPaTy+1JVZoLTQdDg2PMZ3rzlDqzmL+WKd5AqPYfFg1GNQ802qAUDWJu+Jij0zBy+FAqxxXazwess06SUr1v2RpcwpqRyHhNi1N4Pwfas4WuHiwRqIZIYUYbm8eX2WiLwbAZsDlJdAwmjR4iIrAo+QciRjXpPL8Ns/Nqay5L2nPwIDAQAB";
var encrypt = new JSEncrypt();
encrypt.setPublicKey(publickey);
var encrypted = encrypt.encrypt("123456"); //加密的字段
$.ajax({
type : 'Post',
url : '/testweb/Jsencrypt', //请求地址
data : {
action : "click",
data : encrypted
},
dataType : 'text', //返回类型
success : function(data) { //请求成功
alert(data);
},
error : function(XMLHttpRequest, textStatus) { //请求失败
if (textStatus == 'timeout') {
var xmlhttp = window.XMLHttpRequest ? new window.XMLHttpRequest() : new ActiveXObject("Microsoft.XMLHttp");
xmlhttp.abort();
alert("请求超时");
} else if (textStatus == "error") {
alert("服务器内部错误");
} else if (textStatus == "parsererror") {
alert("返回类型错误");
}
}
});
});
});
</script>
</head>
<body>
This is my JSP page.
<br>
<div id="btn">click</div>
</body>
</html>
原文链接：https://www.idaobin.com/archives/2074.html
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