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整理了有关加密算法工具类，结合了几个博客以及自己改良后可直接使用，主要介绍以下四种加密方式：AES、DES、MD5、RSA，详细介绍都在注释里面有讲。

一、AES

import com.alibaba.fastjson.JSONObject;
import java.nio.charset.StandardCharsets;
import java.security.*;
import java.util.Base64;
import javax.crypto.*;
import javax.crypto.spec.*;/*** AES-对称加密算法（ECB、CBC模式）* AES使用128位、192位或256位密钥来加密和解密数据，每次加密或解密需要对数据进行128位、192位或256位的长加密，然后进行异或操作。*/
public class AESUtil {// 128位密钥 = 16 bytes Key:public static String key128 = "zhangximing";public static void main(String[] args) throws GeneralSecurityException {JSONObject param = new JSONObject();param.put("billCode", "FBX123456");param.put("remark","测试xxx");String message = param.toJSONString();byte[] data = message.getBytes(StandardCharsets.UTF_8);//对于ECB工作模式，我们使用"AES/ECB/PKCS5Padding"作为加密模式，//对于CBC工作模式，我们使用"AES/CBC/PKCS5Padding"作为加密模式。//加密后的密文将以Base64编码的形式输出。/*** ECB（Electronic Codebook）工作模式是AES加密算法的一种，它将明文分为固定大小的块，对每个块进行加密，然后将所有块的密文进行拼接，形成密文。* 这种模式的主要优点是简单、并行化处理和错误传播有限；缺点是容易受到密码本重放攻击的影响（密码本重放攻击是指攻击者在获得对数据进行加密的密钥后，再次使用相同的密钥加密相同的明文，从而获得相同的密文。），不适用于加密大量数据。*///ECB工作模式// 加密:byte[] encrypted = encryptECB(key128, data);String encodeToString = Base64.getEncoder().encodeToString(encrypted);System.out.println("Encrypted: " + encodeToString);// 解密:byte[] decrypted = decryptECB(key128, Base64.getDecoder().decode(encodeToString));System.out.println("Decrypted: " + new String(decrypted, StandardCharsets.UTF_8));/*** CBC（Cipher Block Chaining）工作模式也是AES加密算法的一种，它将明文分为固定大小的块，对每个块进行加密，并将前一个加密块与当前块进行异或操作（这里增加了额外参数设置了块与块之间的关联），然后将所有块的密文进行拼接，形成密文。* 这种模式的主要优点是能够抵御密码本重放攻击，适用于加密大量数据；缺点是需要额外的初始向量（IV）来确保加密的随机性，如果IV被泄露或者被攻击者捕获，可能会导致整个加密消息被解密。*///CBC工作模式// 加密:byte[] encrypted2 = encryptCBC(key128,data);System.out.println("Encrypted: " + Base64.getEncoder().encodeToString(encrypted2));// 解密:byte[] decrypted2 = decryptCBC(key128, encrypted2);System.out.println("Decrypted: " + new String(decrypted2, StandardCharsets.UTF_8));}// String类型加密:public static String encryptECB(String key, String input) throws GeneralSecurityException {byte[] bytes = AESUtil.encryptECB(key, input.getBytes(StandardCharsets.UTF_8));return Base64.getEncoder().encodeToString(bytes);}// 加密:public static byte[] encryptECB(String key, byte[] input) throws GeneralSecurityException {Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");SecretKey keySpec = new SecretKeySpec(key.getBytes(StandardCharsets.UTF_8), "AES");cipher.init(Cipher.ENCRYPT_MODE, keySpec);return cipher.doFinal(input);}// 解密:public static String decryptECB(String key, String input) throws GeneralSecurityException {byte[] bytes = AESUtil.decryptECB(key128, Base64.getDecoder().decode(input));return new String( bytes, StandardCharsets.UTF_8);}// 解密:public static byte[] decryptECB(String key, byte[] input) throws GeneralSecurityException {Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");SecretKey keySpec = new SecretKeySpec(key.getBytes(StandardCharsets.UTF_8), "AES");cipher.init(Cipher.DECRYPT_MODE, keySpec);return cipher.doFinal(input);}// 加密:public static byte[] encryptCBC(String key, byte[] input) throws GeneralSecurityException {Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(StandardCharsets.UTF_8), "AES");// CBC模式需要生成一个16 bytes的initialization vector:SecureRandom sr = SecureRandom.getInstanceStrong();byte[] iv = sr.generateSeed(16);IvParameterSpec ivps = new IvParameterSpec(iv);cipher.init(Cipher.ENCRYPT_MODE, keySpec, ivps);byte[] data = cipher.doFinal(input);// IV不需要保密，把IV和密文一起返回:return join(iv, data);}// 解密:public static byte[] decryptCBC(String key, byte[] input) throws GeneralSecurityException {// 把input分割成IV和密文:byte[] iv = new byte[16];byte[] data = new byte[input.length - 16];System.arraycopy(input, 0, iv, 0, 16);System.arraycopy(input, 16, data, 0, data.length);// 解密:Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(StandardCharsets.UTF_8), "AES");IvParameterSpec ivps = new IvParameterSpec(iv);cipher.init(Cipher.DECRYPT_MODE, keySpec, ivps);return cipher.doFinal(data);}public static byte[] join(byte[] bs1, byte[] bs2) {byte[] r = new byte[bs1.length + bs2.length];System.arraycopy(bs1, 0, r, 0, bs1.length);System.arraycopy(bs2, 0, r, bs1.length, bs2.length);return r;}}

二、DES

import java.security.Key;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import com.alibaba.fastjson.JSONObject;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;/*** DES是一种对称加密算法，所谓对称加密算法:加密和解密使用相同的秘钥的算法* DES使用64位密钥来加密和解密数据，每次加密或解密需要64位密钥的循环左移和异或操作。**/
public class DESUtil {private static Key key;//设置秘钥keyprivate static String KEY_STR="guoyi";private static String CHARSETNAME="UTF-8";private static String ALGORITHM="DES";static{try{//生成DES算法对象KeyGenerator generator=KeyGenerator.getInstance(ALGORITHM);//运用SHA1安全策略SecureRandom secureRandom=SecureRandom.getInstance("SHA1PRNG");//设置上密钥种子secureRandom.setSeed(KEY_STR.getBytes());//初始化基于SHA1的算法对象generator.init(secureRandom);//生成密钥对象key=generator.generateKey();generator=null;}catch(Exception e){throw new RuntimeException(e);}}/*** 获取加密的信息* @param str* @return*/public static String getEncryptString(String str){//基于BASE64编码，接收byte[]并转换成StringBASE64Encoder base64Encoder=new BASE64Encoder();try {// 按UTF8编码byte[] bytes = str.getBytes(CHARSETNAME);// 获取加密对象Cipher cipher = Cipher.getInstance(ALGORITHM);// 初始化密码信息cipher.init(Cipher.ENCRYPT_MODE, key);// 加密byte[] doFinal = cipher.doFinal(bytes);// byte[]to encode好的String并返回return base64Encoder.encode(doFinal);} catch (Exception e) {throw new RuntimeException(e);}}/*** 获取解密之后的信息** @param str* @return*/public static String getDecryptString(String str) {// 基于BASE64编码，接收byte[]并转换成StringBASE64Decoder base64decoder = new BASE64Decoder();try {// 将字符串decode成byte[]byte[] bytes = base64decoder.decodeBuffer(str);// 获取解密对象Cipher cipher = Cipher.getInstance(ALGORITHM);// 初始化解密信息cipher.init(Cipher.DECRYPT_MODE, key);// 解密byte[] doFinal = cipher.doFinal(bytes);// 返回解密之后的信息return new String(doFinal, CHARSETNAME);} catch (Exception e) {throw new RuntimeException(e);}}public static void main(String[] args) {JSONObject param = new JSONObject();param.put("billCode", "FBX123456");param.put("remark","测试xxx");//加密String encryptString = getEncryptString(param.toJSONString());System.out.println(encryptString);//解密System.out.println(getDecryptString(encryptString));}
}

以上是AES和DES加密，顺带讲下区别：
加密速度：AES加密速度较快，比DES加密速度更快。
加密安全性：AES加密安全性更高，更难被暴力破解。
密钥长度：AES支持128位、192位和256位密钥长度，而DES只支持64位密钥长度。
数据长度：AES可以加密和解密任意长度的数据，而DES只能加密64位的数据块。
实现方式：AES是面向密码学的（比较复杂的情况），而DES是基于密码学协议的（一般用于信息通讯加密，身份验证等比较简单的情况）。
总的来说，AES比DES更安全、更快速、支持更多的密钥长度和数据长度，并且更易于实现。因此，在实际应用中，更推荐使用AES加密算法。

三、MD5

import com.alibaba.fastjson.JSONObject;
import java.security.MessageDigest;/*** MD5加密（不可逆，一般用于校验）*/
public class MD5Util {/*** 对传入的String进行MD5加密** @param s* @return*/public static final String getMd5(String s) {// 16进制数组char hexDigits[] = { '5', '0', '5', '6', '2', '9', '6', '2', '5', 'q', 'b', 'l', 'e', 's', 's', 'y' };try {char str[];// 将传入的字符串转换成byte数组byte strTemp[] = s.getBytes();// 获取MD5加密对象MessageDigest mdTemp = MessageDigest.getInstance("MD5");// 传入需要加密的目标数组mdTemp.update(strTemp);// 获取加密后的数组byte md[] = mdTemp.digest();int j = md.length;str = new char[j * 2];int k = 0;// 将数组做位移for (int i = 0; i < j; i++) {byte byte0 = md[i];str[k++] = hexDigits[byte0 >>> 4 & 0xf];str[k++] = hexDigits[byte0 & 0xf];}// 转换成String并返回return new String(str);} catch (Exception e) {return null;}}public static void main(String[] args) {JSONObject param = new JSONObject();param.put("billCode", "FBX123456");param.put("remark","测试xxx");String content = param.toJSONString();System.out.println(MD5Util.getMd5(content));//5y6y9590ssq2bss56ss6b5eybs6595b5}
}

四、RSA

import com.alibaba.fastjson.JSONObject;
import javax.crypto.Cipher;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.Base64;
import java.util.HashMap;
import java.util.Map;/*** RSA 是一种基于公钥加密算法，它可以在不共享密钥的情况下，使用公钥加密信息，并使用私钥解密信息。* 一般来说是公钥加密，私钥解密。因为公钥用于公开给多个人，而私钥是个人的，然后私钥加密的一般用于加签的形式，但是容易信息泄漏，因为含明文（RSA加签在许多应用场景中都有广泛应用，例如数字证书、电子签名等。）。* 加密：公钥放在客户端，使用公钥对数据进行加密，服务端拿到数据后用私钥进行解密。* 加签：私钥放在客户端，使用私钥对数据进行加签，服务端拿到数据后用公钥进行验签。*/
public class RSAUtil {private final static String RSA_ALGORITHM = "RSA";private final static String SIGNATURE_ALGORITHM = "MD5withRSA";private final static String RSA_PUBLIC_KEY = "RSAPublicKey";private final static String RSA_PRIVATE_KEY = "RSAPrivateKey";//base64对二进制数据进行编码解码public static String encodeBase64(byte[] binaryData) {Base64.Encoder encoder = Base64.getEncoder();return encoder.encodeToString(binaryData);}public static byte[] decodeBase64(String encoded) {Base64.Decoder decoder = Base64.getDecoder();return decoder.decode(encoded);}//生成密钥对public static Map<String,Object> getKey() throws NoSuchAlgorithmException {// 因为只存公钥和私钥，所以指明Map的长度是2Map<String,Object> keyMap = new HashMap<String,Object>(2);// 获取RSA算法实例KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(RSA_ALGORITHM);// 1024代表密钥二进制位数keyPairGen.initialize(1024);// 产生KeyPair工厂KeyPair keyPair = keyPairGen.generateKeyPair();RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();keyMap.put(RSA_PUBLIC_KEY, publicKey);keyMap.put(RSA_PRIVATE_KEY, privateKey);return keyMap;}/*** 使用私钥对数据进行加密*/public static byte[] encryptPrivateKey(byte[] binaryData, String privateKey) throws Exception {byte[] keyBytes = decodeBase64(privateKey);PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);// 获取RSA算法实例KeyFactory keyFactory = KeyFactory.getInstance(RSA_ALGORITHM);Key priKey = keyFactory.generatePrivate(keySpec);// 初始化加密器Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());cipher.init(Cipher.ENCRYPT_MODE, priKey);return cipher.doFinal(binaryData);}/*** 使用公钥对数据进行加密*/public static byte[] encryptPublicKey(byte[] binaryData, String publicKey) throws Exception {byte[] keyBytes = decodeBase64(publicKey);X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);// 获取RSA算法实例KeyFactory keyFactory = KeyFactory.getInstance(RSA_ALGORITHM);Key pubKey = keyFactory.generatePublic(keySpec);// 初始化加密器Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());cipher.init(Cipher.ENCRYPT_MODE, pubKey);return cipher.doFinal(binaryData);}/*** 使用私钥对数据进行解密*/public static byte[] decryptPrivateKey(byte[] binaryData, String privateKey) throws Exception {byte[] keyBytes = decodeBase64(privateKey);PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);// 获取RSA算法实例KeyFactory keyFactory = KeyFactory.getInstance(RSA_ALGORITHM);Key priKey = keyFactory.generatePrivate(keySpec);// 初始化加密器Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());cipher.init(Cipher.DECRYPT_MODE, priKey);return cipher.doFinal(binaryData);}/*** 使用公钥对数据进行解密*/public static byte[] decryptPublicKey(byte[] binaryData, String publicKey) throws Exception {byte[] keyBytes = decodeBase64(publicKey);X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);// 获取RSA算法实例KeyFactory keyFactory = KeyFactory.getInstance(RSA_ALGORITHM);Key pubKey = keyFactory.generatePublic(x509KeySpec);// 初始化加密器Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());cipher.init(Cipher.DECRYPT_MODE, pubKey);return cipher.doFinal(binaryData);}/*** 使用私钥对数据进行签名*/public static String sign(byte[] binaryData, String privateKey)throws Exception {byte[] keyBytes = decodeBase64(privateKey);PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);// 获取RSA算法实例KeyFactory keyFactory = KeyFactory.getInstance(RSA_ALGORITHM);PrivateKey priKey = keyFactory.generatePrivate(keySpec);// 获取签名算法Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);signature.initSign(priKey);signature.update(binaryData);return encodeBase64(signature.sign());}/*** 使用公钥对数据签名进行验证*/public static boolean verify(byte[] binaryData, String publicKey, String sign)throws Exception {byte[] keyBytes = decodeBase64(publicKey);X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);// 获取RSA算法实例KeyFactory keyFactory = KeyFactory.getInstance(RSA_ALGORITHM);PublicKey pubKey = keyFactory.generatePublic(keySpec);// 获取签名算法Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);signature.initVerify(pubKey);signature.update(binaryData);return signature.verify(decodeBase64(sign));}//公钥public static String getPublicKey(Map<String,Object> map){RSAPublicKey rsaPublicKey = (RSAPublicKey) map.get(RSA_PUBLIC_KEY);byte[] publicKeyBytes = rsaPublicKey.getEncoded();return encodeBase64(publicKeyBytes);}//密钥public static String getPrivateKey(Map<String,Object> map){RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) map.get(RSA_PRIVATE_KEY);byte[] privateKeyBytes = rsaPrivateKey.getEncoded();return encodeBase64(privateKeyBytes);}//测试public static void main(String[] args) throws Exception {// 1.获取公钥私钥Map<String,Object> map = getKey();System.out.println("公钥："+getPublicKey(map));System.out.println("私钥："+getPrivateKey(map));JSONObject param = new JSONObject();param.put("billCode", "FBX123456");param.put("remark","测试xxx");String content = param.toJSONString();System.out.println("============   分隔符     ===========");// 2.使用私钥加密byte[] encodeContent = encryptPrivateKey(content.getBytes(),getPrivateKey(map));//转字符串String encodeContentStr = Base64.getEncoder().encodeToString(encodeContent);//翻转字节数组byte[] encodeContentB = Base64.getDecoder().decode(encodeContentStr);System.out.println("私钥加密后的数据："+ encodeContentStr);// 3.使用公钥解密byte[] decodeContent = decryptPublicKey(encodeContentB,getPublicKey(map));System.out.println("公钥解密后的数据："+new String(decodeContent));System.out.println("============   分隔符     ===========");// 4.使用公钥加密byte[] encodeContent2 = encryptPublicKey(content.getBytes(),getPublicKey(map));//转字符串String encodeContentStr2 = Base64.getEncoder().encodeToString(encodeContent2);//翻转字节数组byte[] encodeContentB2 = Base64.getDecoder().decode(encodeContentStr2);System.out.println("公钥加密后的数据："+encodeContentStr2);// 5.使用私钥解密byte[] decodeContent2 = decryptPrivateKey(encodeContentB2,getPrivateKey(map));System.out.println("私钥解密后的数据："+new String(decodeContent2));System.out.println("============   分隔符     ===========");// 6.加签String sign = sign(content.getBytes(),getPrivateKey(map));System.out.println("加签后的数据："+sign);// 7.验签boolean result = verify(content.getBytes(),getPublicKey(map),sign);System.out.println("验签结果："+result);}
}

运行结果：

公钥：MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDbLgxOXD+GOmjuPCxdJiiSvgkGxILKUw0+P7OmpJ2YPgrLZIQqTzdyleAlOYkan5/r3Yh0O8A8Ysp9iXRBLdWgUML9y4DBBO3esUP4uiNlJ/iRHVjvcSjLgpi2dH4iXABiYmjDGZ+Ly31R8KoFa+xmO/G9CkkU/vpoL9WrNYUyiwIDAQAB
私钥：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
============   分隔符     ===========
私钥加密后的数据：zSB0VYpAtzhfLUbmILcahTAG/6t60XUZ/lN7GKWrlDhM27yZaRx3pXh0cdZFLnsfe6zEKEzZ+iMTrDcXxVsrK2GfBrUmBtXi+gniaAUUPw/F/yMH3pX25P2kvFhLRxkLleUuoe2vqTEtWnu5ta3ueOW7kfVii8TGUOID8y1vJI0=
公钥解密后的数据：{"billCode":"FBX123456","remark":"测试xxx"}
============   分隔符     ===========
公钥加密后的数据：yVT+6AHk4dMKhBUCiUTVNRY6tE7hUtkIeDV6fQ5xrL6ZzHfR2OdvrnXOArAaglE6QVmQhteNm9eC9xa3cRAbk2jboAWJ2OGda5DDj2qjnem1Z7ykn4GnqOfHxbxCvpKtDM6B5iNQKmCskIhR/44Z5g7JFEaMXVJSqF/JJWxer+4=
私钥解密后的数据：{"billCode":"FBX123456","remark":"测试xxx"}
============   分隔符     ===========
加签后的数据：De656tVltViMDPm3LEwivqH0i6kwukvZQQCRfkMxXRtNAKnpSGvRZ4axNXi9FIB5VO+nmHv5ujHllfKfVKaC6AGrMe18CaIoaxp1ekr+l7Um1N2L1hR6S6/KdwETuEPj9u2HkcDp0OMZkBQe/EJhM3v7HCd3gEhSsDY/uguWrms=
验签结果：true