标签：
需求环境：
西安项目中，客户要求保护用户的密码信息，不允许在http中传递明文的密码信息。
实现：
用RSA非对称加密方式实现。后台生成rsa密钥对，然后在登陆页面设置rsa公钥，提交时用公钥加密密码，生成的密文传到后台，用私钥解密，获取密码明文。
这样客户端只需要知道rsa加密方式和公钥，前台不知道私钥是无法解密的，此解决方案还是相对比较安全的。
附件是参照网友资料的java+JS的实现，放在这里供大家下载。访问方式/RSA/login.jsp。
需要到http://www.bouncycastle.org下载bcprov-jdk14-123.jar文件。
因为后台要转换成bigint，所以对明文长度有些限制：
总长度不超过126（1汉字长度为9），如下两个字符串：
阿送大法散得阿送大法散得阿送
1232132131231231232131232K1232132131231231232131232K1232132131231231232131232K1232132131231231232131232K1234567890123456789012
RSA速度
* 由于进行的都是大数计算，使得RSA最快的情况也比DES慢上100倍，无论 是软件还是硬件实现。
* 速度一直是RSA的缺陷。一般来说只用于少量数据 加密。
Util.java
-
package RSA;
-
-
-
-
-
-
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;
-
-
-
-
-
-
-
public class RSAUtil {
-
-
private static String RSAKeyStore = "C:/RSAKey.txt";
-
-
-
-
-
-
-
public static KeyPair generateKeyPair() throws Exception {
-
try {
-
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA",
-
new org.bouncycastle.jce.provider.BouncyCastleProvider());
-
final int KEY_SIZE = 1024;
-
keyPairGen.initialize(KEY_SIZE, new SecureRandom());
-
KeyPair keyPair = keyPairGen.generateKeyPair();
-
-
System.out.println(keyPair.getPrivate());
-
System.out.println(keyPair.getPublic());
-
-
saveKeyPair(keyPair);
-
return keyPair;
-
} catch (Exception e) {
-
throw new Exception(e.getMessage());
-
}
-
}
-
-
public static KeyPair getKeyPair() throws Exception {
-
FileInputStream fis = new FileInputStream(RSAKeyStore);
-
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(RSAKeyStore);
-
ObjectOutputStream oos = new ObjectOutputStream(fos);
-
-
oos.writeObject(kp);
-
oos.close();
-
fos.close();
-
}
-
-
-
-
-
-
-
-
-
-
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());
-
}
-
}
-
-
-
-
-
-
-
-
-
-
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());
-
}
-
}
-
-
-
-
-
-
-
-
-
-
-
-
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();
-
-
-
-
int outputSize = cipher.getOutputSize(data.length);
-
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);
-
-
-
-
-
i++;
-
}
-
return raw;
-
} catch (Exception e) {
-
throw new Exception(e.getMessage());
-
}
-
}
-
-
-
-
-
-
-
-
-
-
-
-
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());
-
}
-
}
-
-
-
-
-
-
-
-
public static void main(String[] args) throws Exception {
-
RSAPublicKey rsap = (RSAPublicKey) RSAUtil.generateKeyPair().getPublic();
-
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));
-
}
-
}
LoginAction.java
-
package RSA;
-
-
-
-
-
-
-
import java.math.BigInteger;
-
import java.net.URLDecoder;
-
import java.net.URLEncoder;
-
-
import javax.servlet.http.HttpServletRequest;
-
import javax.servlet.http.HttpServletResponse;
-
-
import RSA.RSAUtil;
-
-
-
-
-
-
-
-
-
-
-
-
public class LoginAction {
-
-
-
-
-
-
-
-
-
-
-
-
-
-
public boolean execute(HttpServletRequest request,
-
HttpServletResponse response) throws Exception {
-
String pwd ;
-
String result = request.getParameter("result");
-
System.out.println("原文加密后为：");
-
System.out.println(result);
-
byte[] en_result = new BigInteger(result, 16).toByteArray();
-
-
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));
-
pwd = sb.reverse().toString();
-
System.out.println(sb);
-
System.out.println("=================================");
-
pwd = URLDecoder.decode(pwd,"UTF-8");
-
System.out.println(pwd);
-
request.setAttribute("pwd", pwd);
-
return true;
-
}
-
}
登陆login.jsp
-
<%@ page language="java" pageEncoding="UTF-8" contentType="text/html; charset=UTF-8"%>
-
-
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
-
<html:html lang="true">
-
<head>
-
<title>login</title>
-
-
<script type="text/javascript" src="js/RSA.js"></script>
-
<script type="text/javascript" src="js/BigInt.js"></script>
-
<script type="text/javascript" src="js/Barrett.js"></script>
-
-
<script type="text/javascript">
-
function rsalogin(){
-
var thisPwd = document.getElementById("password").value;
-
bodyRSA();
-
var result = encryptedString(key, encodeURIComponent(thisPwd));
-
//alert(encodeURIComponent(thisPwd)+"\r\n"+result);
-
loginForm.action="loginCHK.jsp?result="+result;
-
loginForm.submit();
-
}
-
var key ;
-
function bodyRSA(){
-
setMaxDigits(130);
-
key = new RSAKeyPair("10001","","8246a46f44fc4d961e139fd70f4787d272d374532f4d2d9b7cbaad6a15a8c1301319aa6b3f30413b859351c71938aec516fa7147b69168b195e81df46b6bed7950cf3a1c719d42175f73d7c97a85d7d20a9e83688b92f05b3059bb2ff75cd7190a042cd2db97ebc2ab4da366f2a7085556ed613b5a39c9fdd2bb2595d1dc23b5");
-
}
-
</script>
-
</head>
-
-
<body>
-
<form method="post" name="loginForm" target=_blank>
-
<table border="0">
-
<tr>
-
<td>
-
Password:
-
</td>
-
<td>
-
<input type=‘text‘ name="password" id=password style=‘width:400px‘ value="my passwd"/>
-
</td>
-
</tr>
-
<tr>
-
<td colspan="2" align="center">
-
<input type="button" value="SUBMIT" onclick="rsalogin();" />
-
</td>
-
</tr>
-
</table>
-
</form>
-
</body>
-
</html:html>
登陆校验loginCHK.jsp
-
<%@ page language="java" pageEncoding="UTF-8" contentType="text/html; charset=UTF-8"%>
-
-
<jsp:directive.page import="RSA.LoginAction"/>
-
-
<%
-
LoginAction la = new LoginAction();
-
la.execute(request ,response);
-
%>
-
pwd is [<%=request.getAttribute("pwd")%>]
================================================
另外，通过RSA还可以实现数字签名 ：用私钥签名、公钥验证即可。具体可以看代码：
-
package encode;
-
-
import java.security.KeyPair;
-
import java.security.KeyPairGenerator;
-
import java.security.Signature;
-
-
public class DigitalSignature2Example {
-
public static void main(String[] args) {
-
args = new String[] { "中国" };
-
-
if (args.length != 1) {
-
System.err.println("Usage:java DigitalSignature2Example ");
-
System.exit(1);
-
}
-
-
try {
-
byte[] plainText = args[0].getBytes("UTF-8");
-
System.out.println("\nStart generating RSA key.");
-
-
KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA");
-
-
keyGen.initialize(1024);
-
-
KeyPair pair = keyGen.generateKeyPair();
-
System.out.println("\nFinish generating RSA key.");
-
-
Signature sig = Signature.getInstance("SHA1WithRSA");
-
-
sig.initSign(pair.getPrivate());
-
-
sig.update(plainText);
-
-
byte[] signature = sig.sign();
-
System.out.println(sig.getProvider().getInfo());
-
System.out.println("\nSignature: ");
-
System.out.println(new String(signature, "UTF-8"));
-
-
-
System.out.println("\nStart signature verification.");
-
sig.initVerify(pair.getPublic());
-
-
sig.update(plainText);
-
if (sig.verify(signature)) {
-
System.out.println("Signature verificated.");
-
} else {
-
System.out.println("Signature failed.");
-
}
-
} catch (Exception e) {
-
e.printStackTrace();
-
}
-
}
-
}
关于使用JS前台加密、JAVA后台解密的RSA实现，RSA加密和签名
标签：
原文地址：http://blog.csdn.net/u014723529/article/details/46455679
