用javascript与java执行
RSA加密与解密
-12-12 14:58:30出处：
这几天一直做安全登录，网上查了好多资料，不尽如意。
具体实现思路如下：
1。服务端生成公钥与私钥，保存。
2。客户端在请求到登录页面后，随机生成一字符串。
3。后此随机字符串作为密钥加密密码，再用从服务端获取到的公钥加密生成的随机字符串。
4。将此两段密文传入服务端，服务端用私钥解出随机字符串，再用此私钥解出加密的密文。
这其中有一个关键是处理
服务端的公钥，传入客户端，客户端用此公钥加密字符串后，后又能在服务端用私钥解出。
此文即为实现此步而作。
加密算法为RSA：
1。服务端的RSA java实现
/** * */ package com.sunsoft.struts.util;
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，生成密钥对等要领
。 * 须要
到下载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，这个值联系
到块加密的大小，可以修改
，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 publicExp
onent * * @return RSAPublicKey * * @throws Exception */ public static RSAPublicKey generateRSAPublicKey(byte[] modulus, byte[] publicExp
onent) 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(publicExp
onent)); try { return (RSAPublicKey) keyFac.generatePublic(pubKeySpec); } catch (InvalidKeySpecException ex) { throw new Exception(ex.getMessage()); } }
/** * * 生成私钥 * * * @param modulus * * @param privateExp
onent * * @return RSAPrivateKey * * @throws Exception */ public static RSAPrivateKey generateRSAPrivateKey(byte[] modulus, byte[] privateExp
onent) 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(privateExp
onent)); 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要领
不能用
，查看源代码后发觉
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[]执行
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要领
。
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(); 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)); } }
/** * */ package com.sunsoft.struts.util;
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，生成密钥对等要领
。 * 须要
到下载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，这个值联系
到块加密的大小，可以修改
，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 publicExp
onent * * @return RSAPublicKey * * @throws Exception */ public static RSAPublicKey generateRSAPublicKey(byte[] modulus, byte[] publicExp
onent) 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(publicExp
onent)); try { return (RSAPublicKey) keyFac.generatePublic(pubKeySpec); } catch (InvalidKeySpecException ex) { throw new Exception(ex.getMessage()); } }
/** * * 生成私钥 * * * @param modulus * * @param privateExp
onent * * @return RSAPrivateKey * * @throws Exception */ public static RSAPrivateKey generateRSAPrivateKey(byte[] modulus, byte[] privateExp
onent) 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(privateExp
onent)); 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要领
不能用
，查看源代码后发觉
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[]执行
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要领
。
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(); 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)); } }
2.测试页面：
IndexAction.java
/* * Generated by MyEclipse Struts * Template path: templates/java/JavaClass.vtl */ package com.sunsoft.struts.action;
import java.security.interfaces.RSAPrivateKey; import java.security.interfaces.RSAPublicKey;
import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping;
import com.sunsoft.struts.util.RSAUtil;
/** * MyEclipse Struts * Creation date: 06-28- * * XDoclet definition: * @struts.action validate="true" */ public class IndexAction extends Action { /* * Generated Methods */
/** * Method execute * @param mapping * @param form * @param request * @param response * @return ActionForward */ public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)throws Exception {
RSAPublicKey rsap = (RSAPublicKey) RSAUtil.getKeyPair().getPublic(); String module = rsap.getModulus().toString(16); String empoent = rsap.getPublicExp
onent().toString(16); System.out.println("module"); System.out.println(module); System.out.println("empoent"); System.out.println(empoent); request.setAttribute("m", module); request.setAttribute("e", empoent); return mapping.findForward("login"); } }
/* * Generated by MyEclipse Struts * Template path: templates/java/JavaClass.vtl */ package com.sunsoft.struts.action;
import java.security.interfaces.RSAPrivateKey; import java.security.interfaces.RSAPublicKey;
import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping;
import com.sunsoft.struts.util.RSAUtil;
/** * MyEclipse Struts * Creation date: 06-28- * * XDoclet definition: * @struts.action validate="true" */ public class IndexAction extends Action { /* * Generated Methods */
/** * Method execute * @param mapping * @param form * @param request * @param response * @return ActionForward */ public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)throws Exception {
RSAPublicKey rsap = (RSAPublicKey) RSAUtil.getKeyPair().getPublic(); String module = rsap.getModulus().toString(16); String empoent = rsap.getPublicExp
onent().toString(16); system.out.println("module"); system.out.println(module); system.out.println("empoent"); system.out.println(empoent); request.setAttribute("m", module); request.setAttribute("e", empoent); return mapping.findForward("login"); } }
通过此action进入登录页面，并传入公钥的Modulus 与PublicExp
onent的hex编码形式。
3。登录页面login.jsp
login
}
login
}
/* * Generated by MyEclipse Struts * Template path: templates/java/JavaClass.vtl */ package com.sunsoft.struts.action;
import java.math.BigInteger;
import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping;
import com.sunsoft.struts.util.RSAUtil;
/** * MyEclipse Struts * Creation date: 06-28- * * XDoclet definition: * @struts.action path="/login" name="loginForm" input="/login.jsp" scope="request" validate="true" * @struts.action-forward name="error" path="/error.jsp" * @struts.action-forward name="success" path="/success.jsp" */ public class LoginAction extends Action { /* * Generated Methods */
/** * Method execute * @param mapping * @param form * @param request * @param response * @return ActionForward */ public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception{ //LoginForm loginForm = (LoginForm) form; 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(); 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 mapping.findForward("success"); } }
/* * Generated by MyEclipse Struts * Template path: templates/java/JavaClass.vtl */ package com.sunsoft.struts.action;
import java.math.BigInteger;
import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping;
import com.sunsoft.struts.util.RSAUtil;
/** * MyEclipse Struts * Creation date: 06-28- * * XDoclet definition: * @struts.action path="/login" name="loginForm" input="/login.jsp" scope="request" validate="true" * @struts.action-forward name="error" path="/error.jsp" * @struts.action-forward name="success" path="/success.jsp" */ public class LoginAction extends Action { /* * Generated Methods */
/** * Method execute * @param mapping * @param form * @param request * @param response * @return ActionForward */ public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception{ //LoginForm loginForm = (LoginForm) form; 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(); 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 mapping.findForward("success"); } }
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