js加密，java解密
在pom.xml中加入依赖
<dependency> <groupId>org.bouncycastle</groupId> <artifactId>bcprov-jdk15on</artifactId> <version>1.47</version> </dependency>
RSA工具类
/**
* @author lee
*/
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.math.BigInteger;
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.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.RSAPrivateKeySpec;
import java.security.spec.RSAPublicKeySpec;
import javax.crypto.Cipher;
/**
* RSA 工具类。提供加密，解密，生成密钥对等方法。
* 需要到http://www.bouncycastle.org下载bcprov-jdk14-123.jar。
*
*/
public class RSAUtil {
/**
* * 生成密钥对 *
*
* @return KeyPair *
* @throws EncryptException
*/
public static KeyPair generateKeyPair() throws Exception {
try {
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA",
new org.bouncycastle.jce.provider.BouncyCastleProvider());
final int KEY_SIZE = 1024;// 没什么好说的了，这个值关系到块加密的大小，可以更改，但是不要太大，否则效率会低
keyPairGen.initialize(KEY_SIZE, new SecureRandom());
KeyPair keyPair = keyPairGen.generateKeyPair();
saveKeyPair(keyPair);
return keyPair;
} catch (Exception e) {
throw new Exception(e.getMessage());
}
}
public static KeyPair getKeyPair()throws Exception{
FileInputStream fis = new FileInputStream("C:/RSAKey.txt");
ObjectInputStream oos = new ObjectInputStream(fis);
KeyPair kp= (KeyPair) oos.readObject();
oos.close();
fis.close();
return kp;
}
public static void saveKeyPair(KeyPair kp)throws Exception{
FileOutputStream fos = new FileOutputStream("C:/RSAKey.txt");
ObjectOutputStream oos = new ObjectOutputStream(fos);
//生成密钥
oos.writeObject(kp);
oos.close();
fos.close();
}
/**
* * 生成公钥 *
*
* @param modulus *
* @param publicExponent *
* @return RSAPublicKey *
* @throws Exception
*/
public static RSAPublicKey generateRSAPublicKey(byte[] modulus,
byte[] publicExponent) throws Exception {
KeyFactory keyFac = null;
try {
keyFac = KeyFactory.getInstance("RSA",
new org.bouncycastle.jce.provider.BouncyCastleProvider());
} catch (NoSuchAlgorithmException ex) {
throw new Exception(ex.getMessage());
}
RSAPublicKeySpec pubKeySpec = new RSAPublicKeySpec(new BigInteger(
modulus), new BigInteger(publicExponent));
try {
return (RSAPublicKey) keyFac.generatePublic(pubKeySpec);
} catch (InvalidKeySpecException ex) {
throw new Exception(ex.getMessage());
}
}
/**
* * 生成私钥 *
*
* @param modulus *
* @param privateExponent *
* @return RSAPrivateKey *
* @throws Exception
*/
public static RSAPrivateKey generateRSAPrivateKey(byte[] modulus,
byte[] privateExponent) throws Exception {
KeyFactory keyFac = null;
try {
keyFac = KeyFactory.getInstance("RSA",
new org.bouncycastle.jce.provider.BouncyCastleProvider());
} catch (NoSuchAlgorithmException ex) {
throw new Exception(ex.getMessage());
}
RSAPrivateKeySpec priKeySpec = new RSAPrivateKeySpec(new BigInteger(
modulus), new BigInteger(privateExponent));
try {
return (RSAPrivateKey) keyFac.generatePrivate(priKeySpec);
} catch (InvalidKeySpecException ex) {
throw new Exception(ex.getMessage());
}
}
/**
* * 加密 *
*
* @param key
* 加密的密钥 *
* @param data
* 待加密的明文数据 *
* @return 加密后的数据 *
* @throws Exception
*/
public static byte[] encrypt(PublicKey pk, byte[] data) throws Exception {
try {
Cipher cipher = Cipher.getInstance("RSA",
new org.bouncycastle.jce.provider.BouncyCastleProvider());
cipher.init(Cipher.ENCRYPT_MODE, pk);
int blockSize = cipher.getBlockSize();// 获得加密块大小，如：加密前数据为128个byte，而key_size=1024
// 加密块大小为127
// byte,加密后为128个byte;因此共有2个加密块，第一个127
// byte第二个为1个byte
int outputSize = cipher.getOutputSize(data.length);// 获得加密块加密后块大小
int leavedSize = data.length % blockSize;
int blocksSize = leavedSize != 0 ? data.length / blockSize + 1
: data.length / blockSize;
byte[] raw = new byte[outputSize * blocksSize];
int i = 0;
while (data.length - i * blockSize > 0) {
if (data.length - i * blockSize > blockSize)
cipher.doFinal(data, i * blockSize, blockSize, raw, i
* outputSize);
else
cipher.doFinal(data, i * blockSize, data.length - i
* blockSize, raw, i * outputSize);
// 这里面doUpdate方法不可用，查看源代码后发现每次doUpdate后并没有什么实际动作除了把byte[]放到
// ByteArrayOutputStream中，而最后doFinal的时候才将所有的byte[]进行加密，可是到了此时加密块大小很可能已经超出了
// OutputSize所以只好用dofinal方法。
i++;
}
return raw;
} catch (Exception e) {
throw new Exception(e.getMessage());
}
}
/**
* * 解密 *
*
* @param key
* 解密的密钥 *
* @param raw
* 已经加密的数据 *
* @return 解密后的明文 *
* @throws Exception
*/
public static byte[] decrypt(PrivateKey pk, byte[] raw) throws Exception {
try {
Cipher cipher = Cipher.getInstance("RSA",
new org.bouncycastle.jce.provider.BouncyCastleProvider());
cipher.init(cipher.DECRYPT_MODE, pk);
int blockSize = cipher.getBlockSize();
ByteArrayOutputStream bout = new ByteArrayOutputStream(64);
int j = 0;
while (raw.length - j * blockSize > 0) {
bout.write(cipher.doFinal(raw, j * blockSize, blockSize));
j++;
}
return bout.toByteArray();
} catch (Exception e) {
throw new Exception(e.getMessage());
}
}
/**
* * *
*
* @param args *
* @throws Exception
*/
public static void main(String[] args) throws Exception {
RSAPublicKey rsap = (RSAPublicKey) RSAUtil.generateKeyPair().getPublic();
System.out.println(rsap.getModulus().toString(16));
System.out.println(rsap.getPublicExponent().toString(16));
//System.out.println(RSAUtil.getKeyPair().getPrivate());
String test = "hello world";
byte[] en_test = encrypt(getKeyPair().getPublic(),test.getBytes());
byte[] de_test = decrypt(getKeyPair().getPrivate(),en_test);
System.out.println(new String(de_test));
}
}
IndexAction.java
import java.security.interfaces.RSAPublicKey;
import com.leech.util.RSAUtil;
import com.opensymphony.xwork2.ActionContext;
public class IndexAction {
public String execute() throws Exception {
RSAPublicKey rsap = (RSAPublicKey) RSAUtil.getKeyPair().getPublic();
String module = rsap.getModulus().toString(16);
String empoent = rsap.getPublicExponent().toString(16);
System.out.println("module");
System.out.println(module);
System.out.println("empoent");
System.out.println(empoent);
System.out.println("private");
System.out.println(RSAUtil.getKeyPair().getPrivate());
ActionContext.getContext().put("m", module);
ActionContext.getContext().put("e", empoent);
return "success";
}
}
LoginAction.java
import java.math.BigInteger;
import org.apache.struts2.ServletActionContext;
import com.leech.util.RSAUtil;
public class LoginAction {
public String execute() throws Exception{
String result = ServletActionContext.getRequest().getParameter("result");
System.out.println("原文加密后为：");
System.out.println(result);
byte[] en_result = new BigInteger(result, 16).toByteArray();
System.out.println("转成byte[]"+new String(en_result));
byte[] de_result = RSAUtil.decrypt(RSAUtil.getKeyPair().getPrivate(),en_result);
System.out.println("还原密文：");
System.out.println(new String(de_result));
StringBuffer sb = new StringBuffer();
sb.append(new String(de_result));
System.out.println(sb.reverse().toString());
return "success";
}
}
struts.xml配置
<action name="index" class="com.leech.action.IndexAction"> <result>/login_03.jsp</result> </action> <action name="login" class="com.leech.action.LoginAction"> <result>/index.jsp</result> </action>
login_03.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<c:set var="ctx" value="${pageContext.request.contextPath}"/>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript" src="${ctx}/js/rsa/RSA.js"></script>
<script type="text/javascript" src="${ctx}/js/rsa/BigInt.js"></script>
<script type="text/javascript" src="${ctx}/js/rsa/Barrett.js"></script>
<script type="text/javascript">
function rsalogin(){
bodyRSA();
var result = encryptedString(key, document.getElementById("pwd").value);
//alert(result);
loginForm.action="login.action?result="+result;
loginForm.submit();
}
var key ;
function bodyRSA(){
setMaxDigits(130);
key = new RSAKeyPair('${e}',"",'${m}');
}
</script>
</head>
<body>
<form action="login.action" method="post" name="loginForm">
<table border="0">
<tr>
<td>Login:</td>
<td>
<input type="text" name="username" />
</td>
</tr>
<tr>
<td>Password:</td>
<td>
<input type="password" name="password" id="pwd" styleId="pwd"/>
</td>
</tr>
<tr>
<td colspan="2" align="center">
<input type="button" value="SUBMIT" onclick="rsalogin();"/>
</td>
</tr>
</table>
</form>
</body>
</body>
</html>
js文件下载请参考：http://sunxboy.iteye.com/blog/209156