深度揭秘（java加密的几种方法）java加密技术，Java中常用的加密方式(附多个工具类)，java md5加密工具类，

import java.security.InvalidKeyException;import java.security.Key;import java.security.NoSuchAlgorithmException;import java.security.SecureRandom;import java.security.spec.InvalidKeySpecException;import javax.crypto.Cipher;import javax.crypto.SecretKey;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.DESKeySpec;import org.apache.commons.codec.binary.Base64;public class DESDemo {// 算法名称public static final String KEY_ALGORITHM = "DES";// 算法名称/加密模式/填充方式// DES共有四种工作模式-->>ECB：电子密码本模式、CBC：加密分组链接模式、CFB：加密反馈模式、OFB：输出反馈模式public static final String CIPHER_ALGORITHM = "DES/ECB/NoPadding";/**** 生成密钥key对象** @param KeyStr* 密钥字符串* @return 密钥对象* @throws InvalidKeyException* @throws NoSuchAlgorithmException* @throws InvalidKeySpecException* @throws Exception*/private static SecretKey keyGenerator(String keyStr) throws Exception {byte input[] = HexString2Bytes(keyStr);DESKeySpec desKey = new DESKeySpec(input);// 创建一个密匙工厂，然后用它把DESKeySpec转换成SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");SecretKey securekey = keyFactory.generateSecret(desKey);return securekey;}private static int parse(char c) {if (c >= a)return (c - a + 10) & 0x0f;if (c >= A)return (c - A + 10) & 0x0f;return (c - 0) & 0x0f;}// 从十六进制字符串到字节数组转换public static byte[] HexString2Bytes(String hexstr) {byte[] b = new byte[hexstr.length() / 2];int j = 0;for (int i = 0; i < b.length; i++) {char c0 = hexstr.charAt(j++);char c1 = hexstr.charAt(j++);b[i] = (byte) ((parse(c0) << 4) | parse(c1));}return b;}/*** 加密数据** @param data* 待加密数据* @param key* 密钥* @return 加密后的数据*/public static String encrypt(String data, String key) throws Exception {Key deskey = keyGenerator(key);// 实例化Cipher对象，它用于完成实际的加密操作Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);SecureRandom random = new SecureRandom();// 初始化Cipher对象，设置为加密模式cipher.init(Cipher.ENCRYPT_MODE, deskey, random);byte[] results = cipher.doFinal(data.getBytes());// 该部分是为了与加解密在线测试网站（http://tripledes.online-domain-tools.com/）的十六进制结果进行核对for (int i = 0; i < results.length; i++) {System.out.print(results[i] + " ");}System.out.println();// 执行加密操作。加密后的结果通常都会用Base64编码进行传输return Base64.encodeBase64String(results);}/*** 解密数据** @param data* 待解密数据* @param key* 密钥* @return 解密后的数据*/public static String decrypt(String data, String key) throws Exception {Key deskey = keyGenerator(key);Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);// 初始化Cipher对象，设置为解密模式cipher.init(Cipher.DECRYPT_MODE, deskey);// 执行解密操作return new String(cipher.doFinal(Base64.decodeBase64(data)));}public static void main(String[] args) throws Exception {String source = "helloittx";System.out.println("原文: " + source);String key = "A1B2C3D4E5F60708";String encryptData = encrypt(source, key);System.out.println("加密后: " + encryptData);String decryptData = decrypt(encryptData, key);System.out.println("解密后: " + decryptData);}}

import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;import java.math.BigInteger;import java.security.Key;import java.security.KeyFactory;import java.security.KeyPair;import java.security.KeyPairGenerator;import java.security.SecureRandom;import java.security.spec.RSAPrivateCrtKeySpec;import java.security.spec.RSAPublicKeySpec;import javax.crypto.Cipher;import com.lxh.rsatest.HexUtil;import Decoder.BASE64Decoder;import Decoder.BASE64Encoder;public class RSAEncrypt {/** 指定加密算法为DESede */private static String ALGORITHM = "RSA";/** 指定key的大小 */private static int KEYSIZE = 1024;/** 指定公钥存放文件 */private static String PUBLIC_KEY_FILE = "public.keystore";/** 指定私钥存放文件 */private static String PRIVATE_KEY_FILE = "private.keystore";/*** 生成密钥对*/private static void generateKeyPair() throws Exception {/** RSA算法要求有一个可信任的随机数源 */SecureRandom sr = new SecureRandom();/** 为RSA算法创建一个KeyPairGenerator对象 */KeyPairGenerator kpg = KeyPairGenerator.getInstance(ALGORITHM);/** 利用上面的随机数据源初始化这个KeyPairGenerator对象 */kpg.initialize(KEYSIZE, sr);/** 生成密匙对 */KeyPair kp = kpg.generateKeyPair();/** 得到公钥 */Key publicKey = kp.getPublic();/** 得到私钥 */Key privateKey = kp.getPrivate();/** 用对象流将生成的密钥写入文件 */ObjectOutputStream oos1 = new ObjectOutputStream(new FileOutputStream(PUBLIC_KEY_FILE));ObjectOutputStream oos2 = new ObjectOutputStream(new FileOutputStream(PRIVATE_KEY_FILE));oos1.writeObject(publicKey);oos2.writeObject(privateKey);/** 清空缓存，关闭文件输出流 */oos1.close();oos2.close();}/*** 生成密钥对字符串*/private static void generateKeyPairString() throws Exception {/** RSA算法要求有一个可信任的随机数源 */SecureRandom sr = new SecureRandom();/** 为RSA算法创建一个KeyPairGenerator对象 */KeyPairGenerator kpg = KeyPairGenerator.getInstance(ALGORITHM);/** 利用上面的随机数据源初始化这个KeyPairGenerator对象 */kpg.initialize(KEYSIZE, sr);/** 生成密匙对 */KeyPair kp = kpg.generateKeyPair();/** 得到公钥 */Key publicKey = kp.getPublic();/** 得到私钥 */Key privateKey = kp.getPrivate();/** 用字符串将生成的密钥写入文件 */String algorithm = publicKey.getAlgorithm(); // 获取算法KeyFactory keyFact = KeyFactory.getInstance(algorithm);BigInteger prime = null;BigInteger exponent = null;RSAPublicKeySpec keySpec = (RSAPublicKeySpec) keyFact.getKeySpec(publicKey, RSAPublicKeySpec.class);prime = keySpec.getModulus();exponent = keySpec.getPublicExponent();System.out.println("公钥模量：" + HexUtil.bytes2Hex(prime.toByteArray()));System.out.println("公钥指数:" + HexUtil.bytes2Hex(exponent.toByteArray()));System.out.println(privateKey.getAlgorithm());RSAPrivateCrtKeySpec privateKeySpec = (RSAPrivateCrtKeySpec) keyFact.getKeySpec(privateKey,RSAPrivateCrtKeySpec.class);BigInteger privateModulus = privateKeySpec.getModulus();BigInteger privateExponent = privateKeySpec.getPrivateExponent();System.out.println("私钥模量：" + HexUtil.bytes2Hex(privateModulus.toByteArray()));System.out.println("私钥指数:" + HexUtil.bytes2Hex(privateExponent.toByteArray()));}/*** 加密方法 source： 源数据*/public static String encrypt(String source) throws Exception {generateKeyPair();/** 将文件中的公钥对象读出 */ObjectInputStream ois = new ObjectInputStream(new FileInputStream(PUBLIC_KEY_FILE));Key key = (Key) ois.readObject();ois.close();String algorithm = key.getAlgorithm(); // 获取算法KeyFactory keyFact = KeyFactory.getInstance(algorithm);BigInteger prime = null;BigInteger exponent = null;if ("RSA".equals(algorithm)) { // 如果是RSA加密RSAPublicKeySpec keySpec = (RSAPublicKeySpec) keyFact.getKeySpec(key, RSAPublicKeySpec.class);prime = keySpec.getModulus();exponent = keySpec.getPublicExponent();// System.out.println("公钥模量：" + HexUtil.bytes2Hex(prime.toByteArray()));// System.out.println("公钥指数:" + HexUtil.bytes2Hex(exponent.toByteArray()));}/** 得到Cipher对象来实现对源数据的RSA加密 */Cipher cipher = Cipher.getInstance(ALGORITHM);cipher.init(Cipher.ENCRYPT_MODE, key);byte[] b = source.getBytes();/** 执行加密操作 */byte[] b1 = cipher.doFinal(b);BASE64Encoder encoder = new BASE64Encoder();return encoder.encode(b1);}/*** 解密算法 cryptograph:密文*/public static String decrypt(String cryptograph) throws Exception {/** 将文件中的私钥对象读出 */ObjectInputStream ois = new ObjectInputStream(new FileInputStream(PRIVATE_KEY_FILE));Key key = (Key) ois.readObject();String algorithm = key.getAlgorithm(); // 获取算法KeyFactory keyFact = KeyFactory.getInstance(algorithm);RSAPrivateCrtKeySpec privateKeySpec = (RSAPrivateCrtKeySpec) keyFact.getKeySpec(key,RSAPrivateCrtKeySpec.class);BigInteger privateModulus = privateKeySpec.getModulus();BigInteger privateExponent = privateKeySpec.getPrivateExponent();// System.out.println("私钥模量：" + HexUtil.bytes2Hex(privateModulus.toByteArray()));// System.out.println("私钥指数:" + HexUtil.bytes2Hex(privateExponent.toByteArray()));/** 得到Cipher对象对已用公钥加密的数据进行RSA解密 */Cipher cipher = Cipher.getInstance(ALGORITHM);cipher.init(Cipher.DECRYPT_MODE, key);BASE64Decoder decoder = new BASE64Decoder();byte[] b1 = decoder.decodeBuffer(cryptograph);/** 执行解密操作 */byte[] b = cipher.doFinal(b1);return new String(b);}public static void main(String[] args) throws Exception {generateKeyPair(); //生成文件形式公钥和私钥//generateKeyPairString();//生成字符串形式公钥和私钥String source = "非对称加密RSA";// 要加密的字符串String cryptograph = encrypt(source);// 生成的密文String hexCrypt = HexUtil.bytes2Hex(cryptograph.getBytes(), false);System.out.println("生成的密文--->" + hexCrypt);String target = decrypt(HexUtil.hex2String(hexCrypt));// 解密密文System.out.println("解密密文--->" + target);}}

public void testJDKBase64(){String encoderStr = java.util.Base64.getEncoder().encodeToString(s.getBytes());System.out.println("encode :"+encoderStr);String decodeStr = new String(java.util.Base64.getDecoder().decode(encoderStr));System.out.println("decodeStr :"+decodeStr);}public void testCodecBase64(){String encoderStr = org.apache.commons.codec.binary.Base64.encodeBase64String(s.getBytes());System.out.println("encode :"+encoderStr);String decodeStr = new String(org.apache.commons.codec.binary.Base64.decodeBase64(encoderStr));System.out.println("decodeStr :"+decodeStr);}

package com.hl.bluetooth.util;import org.springframework.boot.system.ApplicationHome;import org.springframework.stereotype.Component;import org.springframework.web.multipart.MultipartFile;import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder;import java.io.*;import java.util.Objects;/*** @DateL 2021/11/16 15:09* @ClassName: FileUtils**/@Componentpublic class FileUtils {public static File multipartFileToFile(MultipartFile multipartFile) {File file = new File(Objects.requireNonNull(multipartFile.getOriginalFilename()));try {InputStream ins = null;ins = multipartFile.getInputStream();OutputStream os = new FileOutputStream(file);int bytesRead = 0;byte[] buffer = new byte[8192];while ((bytesRead = ins.read(buffer, 0, 8192)) != -1) {os.write(buffer, 0, bytesRead);}os.close();ins.close();} catch (Exception e) {e.printStackTrace();}return file;}/*** 图片转化成base64字符串**/public static String getImageStr(String imgPath) {InputStream in = null;byte[] data = null;String encode = null;// 对字节数组Base64编码BASE64Encoder encoder = new BASE64Encoder();try {// 读取图片字节数组in = new FileInputStream(imgPath);data = new byte[in.available()];in.read(data);encode = encoder.encode(data);} catch (IOException e) {e.printStackTrace();} finally {try {in.close();} catch (IOException e) {e.printStackTrace();}}return encode;}/*** base64字符串转化成图片** @param imgData 图片编码*/public static String generateImage(String imgData, String fileName) {if (imgData == null) {// 图像数据为空return "null";}ApplicationHome applicationHome = new ApplicationHome(FileUtils.class);File source = applicationHome.getSource();String dirPath = source.getParentFile().toString() + "/upload";BASE64Decoder decoder = new BASE64Decoder();File dir = new File(dirPath);if (!dir.exists()){dir.mkdirs();}File file = new File(dirPath+"/"+fileName);if (file.exists()){file.delete();}try {// Base64解码byte[] b = decoder.decodeBuffer(imgData);for (int i = 0; i < b.length; ++i) {// 调整异常数据if (b[i] < 0) {b[i] += 256;}}OutputStream out = new FileOutputStream(dirPath+"\\"+fileName);out.write(b);out.flush();out.close();return dirPath+"\\"+fileName;} catch (Exception e) {e.printStackTrace();return "null";}}}

import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;/*** Java消息摘要算法 MD5 工具类,其实其他摘要算法的实现也类似*/public class MD5Util {/*** 对文本执行 md5 摘要加密, 此算法与 mysql,JavaScript生成的md5摘要进行过一致性对比.* @param plainText* @return 返回值中的字母为小写*/public static String md5(String plainText) {if (null == plainText) {plainText = "";}String MD5Str = "";try {// JDK 6 支持以下6种消息摘要算法，不区分大小写// md5,sha(sha-1),md2,sha-256,sha-384,sha-512MessageDigest md = MessageDigest.getInstance("MD5");md.update(plainText.getBytes());byte b[] = md.digest();int i;StringBuilder builder = new StringBuilder(32);for (int offset = 0; offset < b.length; offset++) {i = b[offset];if (i < 0)i += 256;if (i < 16)builder.append("0");builder.append(Integer.toHexString(i));}MD5Str = builder.toString();// LogUtil.println("result: " + buf.toString());// 32位的加密} catch (NoSuchAlgorithmException e) {e.printStackTrace();}return MD5Str;}// 一个简版测试public static void main(String[] args) {String m1 = md5("1");String m2 = md5(m1);/* 输出为* m1=c4ca4238a0b923820dcc509a6f75849b* m2=28c8edde3d61a0411511d3b1866f0636*/System.out.println("m1="+m1);System.out.println("m2="+m2);}}

import java.security.KeyFactory;import java.security.KeyPair;import java.security.KeyPairGenerator;import java.security.PrivateKey;import java.security.PublicKey;import java.security.Signature;import java.security.interfaces.RSAPrivateKey;import java.security.interfaces.RSAPublicKey;import java.security.spec.PKCS8EncodedKeySpec;import java.security.spec.X509EncodedKeySpec;import org.apache.commons.codec.binary.Hex;public class RSATest {public static final String src = "hello world";public static void main(String[] args) {jdkRSA();}/*** 说明： 用java的jdk里面相关方法实现rsa的签名及签名验证*/public static void jdkRSA() {try {// 1.初始化密钥KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");//设置KEY的长度keyPairGenerator.initialize(512);KeyPair keyPair = keyPairGenerator.generateKeyPair();//得到公钥RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic();//得到私钥RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate();// 2.进行签名//用私钥进行签名PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(rsaPrivateKey.getEncoded());KeyFactory keyFactory = KeyFactory.getInstance("RSA");//构造一个privateKeyPrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);//声明签名的对象Signature signature = Signature.getInstance("MD5withRSA");signature.initSign(privateKey);signature.update(src.getBytes());//进行签名byte[] result = signature.sign();System.out.println("jdk rsa sign:" + Hex.encodeHexString(result));// 3.验证签名//用公钥进行验证签名X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(rsaPublicKey.getEncoded());keyFactory = KeyFactory.getInstance("RSA");//构造一个publicKeyPublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);//声明签名对象signature = Signature.getInstance("MD5withRSA");signature.initVerify(publicKey);signature.update(src.getBytes());//验证签名boolean bool = signature.verify(result);System.out.println("jdk rsa verify:" + bool);} catch (Exception e) {System.out.println(e.toString());}}}

package com.hl.bluetooth.util;import org.apache.commons.lang3.StringUtils;import org.apache.tomcat.util.codec.binary.Base64;import javax.crypto.Cipher;import javax.crypto.spec.IvParameterSpec;import javax.crypto.spec.SecretKeySpec;public class AesEncryptUtil {//使用AES-128-CBC加密模式，key需要为16位,key和iv可以相同！private final static String KEY = "ABCDEF1234432100";private final static String IV = "43211234DCAB6789";/*** 加密方法* @param data 要加密的数据* @param key 加密key* @param iv 加密iv* @return 加密的结果* @throws Exception*/public static String encrypt(String data, String key, String iv) throws Exception {try {Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");//"算法/模式/补码方式"NoPadding PkcsPaddingint blockSize = cipher.getBlockSize();byte[] dataBytes = data.getBytes();int plaintextLength = dataBytes.length;if (plaintextLength % blockSize != 0) {plaintextLength = plaintextLength + (blockSize - (plaintextLength % blockSize));}byte[] plaintext = new byte[plaintextLength];System.arraycopy(dataBytes, 0, plaintext, 0, dataBytes.length);SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);byte[] encrypted = cipher.doFinal(plaintext);return new Base64().encodeToString(encrypted);} catch (Exception e) {e.printStackTrace();return null;}}/*** 解密方法* @param data 要解密的数据* @param key 解密key* @param iv 解密iv* @return 解密的结果* @throws Exception*/public static String desEncrypt(String data, String key, String iv) throws Exception {try {// byte[] encrypted1 = new Base64().decode(data);byte[] encrypted1 = parseHexStr2Byte(data);// Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);byte[] original = cipher.doFinal(encrypted1);String originalString = new String(original);return originalString;} catch (Exception e) {e.printStackTrace();return null;}}/*** 使用默认的key和iv加密* @param data* @return* @throws Exception*/public static String encrypt(String data) throws Exception {return encrypt(data, KEY, IV);}/*** 使用默认的key和iv解密* @param data* @return* @throws Exception*/public static String desEncrypt(String data) throws Exception {if (StringUtils.isEmpty(data)) {return null;}return desEncrypt(data, KEY, IV);}/*** @Author wdc* @Description 16进制转byte数组* @Date 2021/4/19 11:14* @Param [hexStr]* @return byte[]**/public static byte[] parseHexStr2Byte(String hexStr) {if (hexStr.length() < 1)return null;byte[] result = new byte[hexStr.length()/2];for (int i = 0;i< hexStr.length()/2; i++) {int high = Integer.parseInt(hexStr.substring(i*2, i*2+1), 16);int low = Integer.parseInt(hexStr.substring(i*2+1, i*2+2), 16);result[i] = (byte) (high * 16 + low);}return result;}public static void main(String[] args) {// String test = "{admin,admin}";//// String test =new String(test1.getBytes(),"UTF-8");// String data = null;// data = AesEncryptUtil.encrypt(test);// System.out.println("数据："+test);// System.out.println("加密："+data);// String jiemi = AesEncryptUtil.desEncrypt(data);// System.out.println("解密："+jiemi);}}base64package com.sgitg.util;import java.io.UnsupportedEncodingException;import org.springframework.util.Base64Utils;public class Base64Util {/*** 解码base64编码的字符串** @param source* @return* @throws UnsupportedEncodingException*/public static String decodeFromString(String source) {String str = "";try {byte[] bt = Base64Utils.decodeFromString(source);str = new String(bt, "utf-8");} catch (UnsupportedEncodingException e) {e.printStackTrace(); // To change body of catch statement use File |// Settings | File Templates.}return str;}/*** 对字符串进行base64编码** @param source* @return* @throws UnsupportedEncodingException*/public static String encodeToString(String source) {byte[] bt = new byte[0];try {bt = source.getBytes("utf-8");} catch (UnsupportedEncodingException e) {e.printStackTrace(); // To change body of catch statement use File |// Settings | File Templates.}return Base64Utils.encodeToString(bt);}}EncryptUtils (编码集合)* 1、Base64编码* 1、AES、DES可逆算法* 2、md5,Hex,Sha不可逆算法加密package com.sgitg.util;import org.apache.commons.codec.digest.DigestUtils;import javax.crypto.Cipher;import javax.crypto.KeyGenerator;import javax.crypto.SecretKey;import javax.crypto.spec.SecretKeySpec;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.nio.MappedByteBuffer;import java.nio.channels.FileChannel;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;import java.security.SecureRandom;import java.util.Base64;import java.util.zip.CRC32;/*** 数据加密* 继承org.apache.commons.codec.digest.DigestUtils* 1、Base64编码* 1、AES、DES可逆算法* 2、md5,Hex,Sha不可逆算法加密** @author liuyadu*/public class EncryptUtils extends DigestUtils {/*** 计算大文件 md5获取getMD5(); SHA1获取getSha1() CRC32获取 getCRC32()*/private static char[] hexDigits = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e,f};// 测试public static void main(String[] args) {String en = encryptDES("hahahaha", "yaer");String de = decryptDES("kzWPLLyAsDeBr84lL2COsA==", "yaer");System.out.println(de);System.out.println(en);en = encryptAES("hahahaha", "yaer");de = decryptAES("FBC82B89BAA1FBBDF3AE086A09D57E7C", "yaer");System.out.println(de);System.out.println(en);}/*** AES加密(可逆)** @param plainText 明文* @param privateKey 密钥* @return* @throws NoSuchAlgorithmException*/public static String encryptAES(String plainText, String privateKey) {try {KeyGenerator kgen = KeyGenerator.getInstance("AES");SecureRandom random = SecureRandom.getInstance("SHA1PRNG");random.setSeed(privateKey.getBytes());kgen.init(128, random);SecretKey secretKey = kgen.generateKey();byte[] enCodeFormat = secretKey.getEncoded();SecretKeySpec secretKeySpec = new SecretKeySpec(enCodeFormat, "AES");Cipher cipher = Cipher.getInstance("AES");byte[] byteContent = plainText.getBytes("utf-8");cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);byte[] byteRresult = cipher.doFinal(byteContent);String sb = new String("");for (int i = 0; i < byteRresult.length; i++) {String hex = Integer.toHexString(byteRresult[i] & 0xFF);if (hex.length() == 1) {hex = 0 + hex;}sb = sb.concat(hex.toUpperCase());}return sb;} catch (Exception e) {return null;}}/*** AES解密** @param cipherText 密文* @param privateKey 密钥* @return* @throws Exception*/public static String decryptAES(String cipherText, String privateKey) {try {if (cipherText.length() < 1) {return null;}byte[] byteRresult = new byte[cipherText.length() / 2];for (int i = 0; i < cipherText.length() / 2; i++) {int high = Integer.parseInt(cipherText.substring(i * 2, i * 2 + 1), 16);int low = Integer.parseInt(cipherText.substring(i * 2 + 1, i * 2 + 2), 16);byteRresult[i] = (byte) (high * 16 + low);}KeyGenerator kgen = KeyGenerator.getInstance("AES");SecureRandom random = SecureRandom.getInstance("SHA1PRNG");random.setSeed(privateKey.getBytes());kgen.init(128, random);SecretKey secretKey = kgen.generateKey();byte[] enCodeFormat = secretKey.getEncoded();SecretKeySpec secretKeySpec = new SecretKeySpec(enCodeFormat, "AES");Cipher cipher = Cipher.getInstance("AES");cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);byte[] result = cipher.doFinal(byteRresult);return new String(result);} catch (Exception e) {return null;}}/*** 加密DES(可逆)** @param plainText 明文* @param privateKey 密钥* @return*/public static String encryptDES(String plainText, String privateKey) {try {KeyGenerator keygen = KeyGenerator.getInstance("DES");SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");secureRandom.setSeed(privateKey.getBytes());keygen.init(56, secureRandom);SecretKey secretKey = keygen.generateKey();Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");cipher.init(Cipher.ENCRYPT_MODE, secretKey);byte[] cipherBytes = cipher.doFinal(plainText.getBytes("utf-8"));byte[] plainTextBytes = Base64.getEncoder().encode(cipherBytes);return new String(plainTextBytes, "utf-8");} catch (Exception e) {e.printStackTrace();return null;}}/*** 解密DES** @param cipherText 密文* @param privateKey 密钥* @return*/public static String decryptDES(String cipherText, String privateKey) {try {KeyGenerator keygen = KeyGenerator.getInstance("DES");SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");secureRandom.setSeed(privateKey.getBytes());keygen.init(56, secureRandom);SecretKey secretKey = keygen.generateKey();Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");cipher.init(Cipher.DECRYPT_MODE, secretKey);byte[] cipherTextBytes = Base64.getDecoder().decode(cipherText.getBytes("utf-8"));byte[] cipherBytes = cipher.doFinal(cipherTextBytes);return new String(cipherBytes, "utf-8");} catch (Exception e) {e.printStackTrace();return null;}}/*** 获取文件md5值** @return md5串*/public static String md5(File file) {try {//encryptMessageDigest messagedigest = MessageDigest.getInstance("MD5");FileInputStream in = new FileInputStream(file);FileChannel ch = in.getChannel();MappedByteBuffer byteBuffer = ch.map(FileChannel.MapMode.READ_ONLY, 0, file.length());messagedigest.update(byteBuffer);return bufferToHex(messagedigest.digest());} catch (Exception e) {return null;}}/**** 获取文件SHA1值** @return String 适用于上G大的文件*/public static String sha1(File file) {try {MessageDigest messagedigest = MessageDigest.getInstance("SHA-1");FileInputStream in = new FileInputStream(file);FileChannel ch = in.getChannel();MappedByteBuffer byteBuffer = ch.map(FileChannel.MapMode.READ_ONLY, 0, file.length());messagedigest.update(byteBuffer);return bufferToHex(messagedigest.digest());} catch (Exception e) {return null;}}/*** 获取文件SHA256值** @return String*/public static String sha256(File file) {try {MessageDigest messagedigest = MessageDigest.getInstance("SHA-256");FileInputStream in = new FileInputStream(file);FileChannel ch = in.getChannel();MappedByteBuffer byteBuffer = ch.map(FileChannel.MapMode.READ_ONLY, 0, file.length());messagedigest.update(byteBuffer);return bufferToHex(messagedigest.digest());} catch (Exception e) {return null;}}/*** 获取文件CRC32码** @return String*/public static String crc32(File file) {CRC32 crc32 = new CRC32();// MessageDigest.getFileInputStream fileInputStream = null;try {fileInputStream = new FileInputStream(file);byte[] buffer = new byte[8192];int length;while ((length = fileInputStream.read(buffer)) != -1) {crc32.update(buffer, 0, length);}return crc32.getValue() + "";} catch (FileNotFoundException e) {e.printStackTrace();return null;} catch (IOException e) {e.printStackTrace();return null;} finally {try {if (fileInputStream != null) {fileInputStream.close();}} catch (IOException e) {e.printStackTrace();}}}/*** 计算二进制数据** @return*/private static String bufferToHex(byte bytes[]) {return bufferToHex(bytes, 0, bytes.length);}private static String bufferToHex(byte bytes[], int m, int n) {StringBuffer stringbuffer = new StringBuffer(2 * n);int k = m + n;for (int l = m; l < k; l++) {appendHexPair(bytes[l], stringbuffer);}return stringbuffer.toString();}private static void appendHexPair(byte bt, StringBuffer stringbuffer) {char c0 = hexDigits[(bt & 0xf0) >> 4];char c1 = hexDigits[bt & 0xf];stringbuffer.append(c0);stringbuffer.append(c1);}}