http://git.oschina.net/xshuai/ai 源码地址
package com.xs.demo.util;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
/**
* DES对称算法加解密方法类
* @author 小帅丶
* @类名称 DES
* @remark DES 密钥长度必须是8
* @date 2017-6-21
*/
public class DES {
/**
* DES算法加密
* @param datasource 需要加密的数据
* @param password des密钥
* @return byte
* @author 小帅丶
*/
public static byte[] encrypt(byte[] datasource,String password) {
try {
//DES算法要求有一个可信任的随机源
SecureRandom random = new SecureRandom();
//创建一个DesKeySpec对象
DESKeySpec desKeySpec = new DESKeySpec(password.getBytes());
//创建一个密钥工厂
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
//将DesKeySpec对象转换成SecrectKey对象
SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
// Cipher对象实例化DES算法进行解密操作
Cipher cipher = Cipher.getInstance("DES");
//用密钥初始化Cipher对象
cipher.init(Cipher.ENCRYPT_MODE, secretKey,random);
//开始加密返回byte字节数据
return cipher.doFinal(datasource);
} catch (Exception e) {
e.getMessage();
}
return null;
}
/**
* DES算法解密
* @param str 需要解密的数据
* @param password des密钥
* @return byte
* @author 小帅丶
*/
public static byte[] decrypt(byte [] str,String password){
try {
//DES算法要求有一个可信任的随机源
SecureRandom random = new SecureRandom();
//创建一个DesKeySpec对象
DESKeySpec desKeySpec = new DESKeySpec(password.getBytes());
//创建一个密钥工厂
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
//将DesKeySpec对象转换成SecrectKey对象
SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
// Cipher对象实例化DES算法进行解密操作
Cipher cipher = Cipher.getInstance("DES");
//用密钥初始化Cipher对象
cipher.init(Cipher.DECRYPT_MODE, secretKey,random);
//开始解密返回byte字节数据
return cipher.doFinal(str);
} catch (Exception e) {
e.getMessage();
}
return null;
}
}
package com.xs.demo.util;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import com.xiaoleilu.hutool.lang.Base64;
/**
*
* @author 小帅丶
* @类名称 RSAEncrypt
* @remark RSA测试生成公私钥对
* @date 2017-6-14
*/
public class RSAEncrypt {
public static void main(String[] args) throws Exception {
// getKeyPair("G:/Envolope"); 生成RSA公私钥对
System.out.println("----------RSA与DES整合算法测试(又名数字信封)----------");
String path = "G:/Envolope";
String text = "测试RSADES";
byte [] plainTextData = DES.encrypt(text.getBytes(), "12345678");
byte [] data = encrypt(loadPrivateKeyByStr(loadPrivateKeyByFile(path)), plainTextData);
System.out.println("原始数据\t"+text);
System.out.println("DES加密后的数据\t"+Base64.encode(plainTextData));
System.out.println("CA私钥加密后的数据"+Base64.encode(data));
System.out.println("开始解密");
byte [] data2 = decrypt(loadPublicKeyByStr(loadPublicKeyByFile(path)), data);
System.out.println("公钥解密出的数据\t"+Base64.encode(data2));
byte [] plainTextData2 = DES.decrypt(data2, "12345678");
System.out.println("解密出来的数据\t"+new String(plainTextData2));
}
/**
* 字节数据转字符串专用集合
*/
private static final char[] HEX_CHAR = { '0', '1', '2', '3', '4', '5', '6',
'7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
/**
* 随机生成密钥对
*
* @param savefilePath
* 证书保存目录
*/
public static void getKeyPair(String savefilePath) {
// 基于RSA算法生成 公私钥对
KeyPairGenerator keyPairGen = null;
try {
keyPairGen = KeyPairGenerator.getInstance("RSA");
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
// 初始化密钥对生成器 大小为1024位
keyPairGen.initialize(1024, new SecureRandom());
// 生成密钥对 保存在keyPair中
KeyPair keyPair = keyPairGen.generateKeyPair();
// 得到私钥
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
// 得到公钥
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
try {
// 得到私钥字符串
String privateKeyString = Base64.encode(privateKey.getEncoded());
// 得到公钥字符串
String publicKeyString = Base64.encode(publicKey.getEncoded());
// 将密钥对写入到文件
FileWriter pubfw = new FileWriter(savefilePath
+ "/publicKey.keystore");
FileWriter prifw = new FileWriter(savefilePath
+ "/privateKey.keystore");
BufferedWriter pubbw = new BufferedWriter(pubfw);
BufferedWriter pribw = new BufferedWriter(prifw);
pubbw.write(publicKeyString);
pribw.write(privateKeyString);
pubbw.flush();
pubbw.close();
pubfw.close();
pribw.flush();
pribw.close();
prifw.close();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 从文件中输入流加载公钥
*
* @param path
* 公钥的地址
* @return String
* @throws Exception
*/
public static String loadPublicKeyByFile(String path) throws Exception {
try {
BufferedReader br = new BufferedReader(new FileReader(path
+ "/publicKey.keystore"));
String readLine = null;
StringBuffer sb = new StringBuffer();
while ((readLine = br.readLine()) != null) {
sb.append(readLine);
}
br.close();
return sb.toString();
} catch (FileNotFoundException e) {
throw new Exception("公钥文件未找到或不存在");
} catch (IOException e) {
throw new Exception("公钥输入流为空");
}
}
/**
* 从字符串中读取公钥
*
* @param publicKeyStr
* @return RSAPublicKey
* @throws Exception
*/
public static RSAPublicKey loadPublicKeyByStr(String publicKeyStr)
throws Exception {
byte[] buffer = Base64.decode(publicKeyStr);
try {
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(buffer);
return (RSAPublicKey) keyFactory.generatePublic(keySpec);
} catch (NoSuchAlgorithmException e) {
throw new Exception("算法不存在");
} catch (InvalidKeySpecException e) {
throw new Exception("公钥非法");
}
}
/**
* 从文件中输入流加载私钥
*
* @param path
* 私钥的地址
* @return String
* @throws Exception
*/
public static String loadPrivateKeyByFile(String path) throws Exception {
try {
BufferedReader br = new BufferedReader(new FileReader(path
+ "/privateKey.keystore"));
String readLine = null;
StringBuffer sb = new StringBuffer();
while ((readLine = br.readLine()) != null) {
sb.append(readLine);
}
br.close();
return sb.toString();
} catch (FileNotFoundException e) {
throw new Exception("私钥文件未找到或不存在");
} catch (IOException e) {
throw new Exception("私钥输入流为空");
}
}
/**
* 从字符串中读取私钥
*
* @param privateKeyStr
* @return RSAPrivateKey
* @throws Exception
*/
public static RSAPrivateKey loadPrivateKeyByStr(String privateKeyStr)
throws Exception {
byte[] buffer = Base64.decode(privateKeyStr);
try {
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(buffer);
return (RSAPrivateKey) keyFactory.generatePrivate(keySpec);
} catch (NoSuchAlgorithmException e) {
throw new Exception("算法不存在");
} catch (InvalidKeySpecException e) {
throw new Exception("私钥非法");
}
}
/**
* 公钥加密过程
*
* @param publicKey
* 公钥
* @param plainTextData
* 明文数据
* @return 明文
* @throws Exception
* 加密过程中的异常信息
*/
public static byte[] encrypt(RSAPublicKey publicKey, byte[] plainTextData)
throws Exception {
if (publicKey == null) {
throw new Exception("加载公钥为空,请修改");
}
try {
Cipher cipher = null;
cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
byte[] output = cipher.doFinal(plainTextData);
return output;
} catch (NoSuchAlgorithmException e) {
throw new Exception("无此加密算法");
} catch (NoSuchPaddingException e) {
e.printStackTrace();
return null;
} catch (InvalidKeyException e) {
throw new Exception("加密公钥非法,请检查");
} catch (IllegalBlockSizeException e) {
throw new Exception("明文长度非法");
} catch (BadPaddingException e) {
throw new Exception("明文数据已损坏");
}
}
/**
* 私钥加密过程
*
* @param privateKey
* 私钥
* @param plainTextData
* 明文数据
* @return 明文
* @throws Exception
* 加密过程中的异常信息
*/
public static byte[] encrypt(RSAPrivateKey privateKey, byte[] plainTextData)
throws Exception {
if (privateKey == null) {
throw new Exception("加密私钥为空, 请设置");
}
Cipher cipher = null;
try {
// 使用默认RSA
cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, privateKey);
byte[] output = cipher.doFinal(plainTextData);
return output;
} catch (NoSuchAlgorithmException e) {
throw new Exception("无此加密算法");
} catch (NoSuchPaddingException e) {
e.printStackTrace();
return null;
} catch (InvalidKeyException e) {
throw new Exception("加密私钥非法,请检查");
} catch (IllegalBlockSizeException e) {
throw new Exception("明文长度非法");
} catch (BadPaddingException e) {
throw new Exception("明文数据已损坏");
}
}
/**
* 私钥解密过程
*
* @param privateKey
* 私钥
* @param cipherData
* 密文数据
* @return 明文
* @throws Exception
* 解密过程中的异常信息
*/
public static byte[] decrypt(RSAPrivateKey privateKey, byte[] cipherData)
throws Exception {
if (privateKey == null) {
throw new Exception("解密私钥为空, 请设置");
}
Cipher cipher = null;
try {
// 使用默认RSA
cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.DECRYPT_MODE, privateKey);
byte[] output = cipher.doFinal(cipherData);
return output;
} catch (NoSuchAlgorithmException e) {
throw new Exception("无此解密算法");
} catch (NoSuchPaddingException e) {
e.printStackTrace();
return null;
} catch (InvalidKeyException e) {
throw new Exception("解密私钥非法,请检查");
} catch (IllegalBlockSizeException e) {
throw new Exception("密文长度非法");
} catch (BadPaddingException e) {
throw new Exception("密文数据已损坏");
}
}
/**
* 公钥解密过程
*
* @param publicKey
* 公钥
* @param cipherData
* 密文数据
* @return 明文
* @throws Exception
* 解密过程中的异常信息
*/
public static byte[] decrypt(RSAPublicKey publicKey, byte[] cipherData)
throws Exception {
if (publicKey == null) {
throw new Exception("解密公钥为空, 请设置");
}
Cipher cipher = null;
try {
// 使用默认RSA
cipher = Cipher.getInstance("RSA");
// cipher= Cipher.getInstance("RSA", new BouncyCastleProvider());
cipher.init(Cipher.DECRYPT_MODE, publicKey);
byte[] output = cipher.doFinal(cipherData);
return output;
} catch (NoSuchAlgorithmException e) {
throw new Exception("无此解密算法");
} catch (NoSuchPaddingException e) {
e.printStackTrace();
return null;
} catch (InvalidKeyException e) {
throw new Exception("解密公钥非法,请检查");
} catch (IllegalBlockSizeException e) {
throw new Exception("密文长度非法");
} catch (BadPaddingException e) {
throw new Exception("密文数据已损坏");
}
}
/**
* 字节数据转十六进制字符串
*
* @param data
* 输入数据
* @return 十六进制内容
*/
public static String byteArrayToString(byte[] data) {
StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i < data.length; i++) {
// 取出字节的高四位 作为索引得到相应的十六进制标识符 注意无符号右移
stringBuilder.append(HEX_CHAR[(data[i] & 0xf0) >>> 4]);
// 取出字节的低四位 作为索引得到相应的十六进制标识符
stringBuilder.append(HEX_CHAR[(data[i] & 0x0f)]);
if (i < data.length - 1) {
stringBuilder.append(' ');
}
}
return stringBuilder.toString();
}
}