package com.fzzy.api.utils;
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import org.bouncycastle.jce.provider.BouncyCastleProvider;
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import org.bouncycastle.pqc.math.linearalgebra.ByteUtils;
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import org.bouncycastle.util.encoders.Hex;
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import javax.crypto.Cipher;
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import javax.crypto.KeyGenerator;
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import javax.crypto.spec.SecretKeySpec;
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import java.security.Key;
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import java.security.SecureRandom;
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import java.security.Security;
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import java.util.Arrays;
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/**
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* @Author: huangyucai
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* @Date: 2022/10/31
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* @Desc:
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**/
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public class SM4Util {
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static {
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Security.addProvider(new BouncyCastleProvider());
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}
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private static final String ENCODING = "UTF-8";
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public static final String ALGORITHM_NAME = "SM4";
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// 加密算法/分组加密模式/分组填充方式
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// PKCS5Padding-以8个字节为一组进行分组加密
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// 定义分组加密模式使用：PKCS5Padding
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public static final String ALGORITHM_NAME_ECB_PADDING = "SM4/ECB/PKCS5Padding";
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// 128-32位16进制；256-64位16进制
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public static final int DEFAULT_KEY_SIZE = 128;
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/**
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* 自动生成密钥（16进制字符串，长度32）
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*
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* @return
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* @explain
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*/
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public static String generateKey() throws Exception {
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return Hex.toHexString(generateKey(DEFAULT_KEY_SIZE));
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}
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/**
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* @param keySize
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* @return
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* @throws Exception
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* @explain
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*/
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public static byte[] generateKey(int keySize) throws Exception {
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KeyGenerator kg = KeyGenerator.getInstance(ALGORITHM_NAME, BouncyCastleProvider.PROVIDER_NAME);
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kg.init(keySize, new SecureRandom());
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return kg.generateKey().getEncoded();
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}
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/**
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* 生成ECB暗号
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*
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* @param algorithmName 算法名称
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* @param mode 模式
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* @param key
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* @return
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* @throws Exception
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* @explain ECB模式（电子密码本模式：Electronic codebook）
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*/
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private static Cipher generateEcbCipher(String algorithmName, int mode, byte[] key) throws Exception {
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Cipher cipher = Cipher.getInstance(algorithmName, BouncyCastleProvider.PROVIDER_NAME);
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Key sm4Key = new SecretKeySpec(key, ALGORITHM_NAME);
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cipher.init(mode, sm4Key);
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return cipher;
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}
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/**
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* sm4加密
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*
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* @param hexKey 16进制密钥（忽略大小写）
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* @param paramStr 待加密字符串
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* @return 返回16进制的加密字符串
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* @explain 加密模式：ECB
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* 密文长度不固定，会随着被加密字符串长度的变化而变化
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*/
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public static String encryptEcb(String hexKey, String paramStr) {
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try {
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String cipherText = "";
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// 16进制字符串-->byte[]
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byte[] keyData = ByteUtils.fromHexString(hexKey);
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// String-->byte[]
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byte[] srcData = paramStr.getBytes(ENCODING);
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// 加密后的数组
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byte[] cipherArray = encrypt_Ecb_Padding(keyData, srcData);
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// byte[]-->hexString
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cipherText = ByteUtils.toHexString(cipherArray);
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return cipherText;
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} catch (Exception e) {
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e.printStackTrace();
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return "";
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}
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}
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/**
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* 加密模式之Ecb
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*
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* @param key
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* @param data
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* @return
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* @throws Exception
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* @explain
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*/
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public static byte[] encrypt_Ecb_Padding(byte[] key, byte[] data) throws Exception {
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Cipher cipher = generateEcbCipher(ALGORITHM_NAME_ECB_PADDING, Cipher.ENCRYPT_MODE, key);
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return cipher.doFinal(data);
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}
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/**
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* sm4解密
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*
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* @param hexKey 16进制密钥
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* @param cipherText 16进制的加密字符串（忽略大小写）
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* @return 解密后的字符串
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* @throws Exception
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* @explain 解密模式：采用ECB
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*/
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public static String decryptEcb(String hexKey, String cipherText) {
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// 用于接收解密后的字符串
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String decryptStr = "";
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// hexString-->byte[]
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byte[] keyData = ByteUtils.fromHexString(hexKey);
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// hexString-->byte[]
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byte[] cipherData = ByteUtils.fromHexString(cipherText);
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// 解密
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byte[] srcData = new byte[0];
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try {
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srcData = decrypt_Ecb_Padding(keyData, cipherData);
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// byte[]-->String
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decryptStr = new String(srcData, ENCODING);
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} catch (Exception e) {
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}
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return decryptStr;
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}
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/**
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* 解密
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*
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* @param key
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* @param cipherText
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* @return
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* @throws Exception
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* @explain
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*/
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public static byte[] decrypt_Ecb_Padding(byte[] key, byte[] cipherText) throws Exception {
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Cipher cipher = generateEcbCipher(ALGORITHM_NAME_ECB_PADDING, Cipher.DECRYPT_MODE, key);
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return cipher.doFinal(cipherText);
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}
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/**
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* 校验加密前后的字符串是否为同一数据
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*
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* @param hexKey 16进制密钥（忽略大小写）
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* @param cipherText 16进制加密后的字符串
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* @param paramStr 加密前的字符串
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* @return 是否为同一数据
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* @throws Exception
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* @explain
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*/
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public static boolean verifyEcb(String hexKey, String cipherText, String paramStr) throws Exception {
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// 用于接收校验结果
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boolean flag = false;
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// hexString-->byte[]
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byte[] keyData = ByteUtils.fromHexString(hexKey);
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// 将16进制字符串转换成数组
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byte[] cipherData = ByteUtils.fromHexString(cipherText);
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// 解密
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byte[] decryptData = decrypt_Ecb_Padding(keyData, cipherData);
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// 将原字符串转换成byte[]
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byte[] srcData = paramStr.getBytes(ENCODING);
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// 判断2个数组是否一致
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flag = Arrays.equals(decryptData, srcData);
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return flag;
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}
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/* public static void main(String[] args) {
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try {
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String json = "{\"name\":\"jz\"}";
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System.out.println("明文：" + json);
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// 生成32位16进制密钥
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String key = SM4Util.generateKey();
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System.out.println("密钥：" + key);
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String cipher = SM4Util.encryptEcb(key, json);
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System.out.println("密文：" + cipher);
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System.out.println("数据是否有效：" + SM4Util.verifyEcb(key, cipher, json));
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String res = SM4Util.decryptEcb(key, cipher);
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System.out.println("解密后数据：" + res);
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} catch (Exception e) {
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e.printStackTrace();
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}
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}*/
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}
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