数字信封(RSA和DES整合测试）加密技术

http://git.oschina.net/xshuai/ai 源码地址

• DES加解密方法
  

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;}}

• RSA+DES整合测试加解密数据。又名数字信封
  

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RSAcipher = 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RSAcipher = 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RSAcipher = 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();}}