对文档进行加密操作，只有经过系统解密后才能进行查看文档内容
这里使用hutool工具类提供的SM2方法，首先引入pom.xml依赖
hutool文档地址
<!--工具类--><dependency><groupId>cn.hutool</groupId><artifactId>hutool-all</artifactId><version>5.6.5</version></dependency>
生成SM2密钥对
SM2 sm2 = new SM2();String privateKeyBase64 = sm2.getPrivateKeyBase64();String publicKeyBase64 = sm2.getPublicKeyBase64();
FileUtils工具类，进行byte数组和文件的转换
package mon.utils.file;import lombok.extern.slf4j.Slf4j;import mons.io.IOUtils;import java.io.*;/*** 文件处理工具类** @author wujie*/@Slf4jpublic class FileUtils {/*** 获得指定文件的byte数组** @param filePath 文件路径* @return 字节数组*/public static byte[] fileToByte(String filePath) {byte[] buffer = null;try {File file = new File(filePath);FileInputStream fis = new FileInputStream(file);ByteArrayOutputStream bos = new ByteArrayOutputStream(1000);byte[] b = new byte[1024];int n;while ((n = fis.read(b)) != -1) {bos.write(b, 0, n);}fis.close();bos.close();buffer = bos.toByteArray();} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return buffer;}/*** 根据byte数组，生成文件* @param bfile 字节数组* @param filePath 文件路径* @param fileName 文件名*/public static void byteToFile(byte[] bfile, String filePath, String fileName) {BufferedOutputStream bos = null;FileOutputStream fos = null;File file = null;try {File dir = new File(filePath);if (!dir.exists() && dir.isDirectory()) {dir.mkdirs();}file = new File(filePath + "\\" + fileName);fos = new FileOutputStream(file);bos = new BufferedOutputStream(fos);bos.write(bfile);} catch (Exception e) {e.printStackTrace();} finally {IOUtils.closeQuietly(bos);IOUtils.closeQuietly(fos);}}}
EncryptionTools 加解密工具类，这里用的静态代码块,加载已存在的密钥对，不用每次都生成新的密钥
package com.smile.project.openinterface.tools.ofd;import cn.hutool.core.codec.Base64;import cn.hutool.crypto.SmUtil;import cn.hutool.crypto.asymmetric.KeyType;import cn.hutool.crypto.asymmetric.SM2;import mon.utils.file.FileUtils;import lombok.extern.slf4j.Slf4j;import org.bouncycastle.jce.provider.BouncyCastleProvider;import java.security.KeyFactory;import java.security.PrivateKey;import java.security.PublicKey;import java.security.spec.PKCS8EncodedKeySpec;import java.security.spec.X509EncodedKeySpec;/*** 加解密工具类** @author: WuJie* @version: 1.0**/@Slf4jpublic class EncryptionTools {private static SM2 SM_2 = null;static {try {BouncyCastleProvider BC = new BouncyCastleProvider();String publicKeyStr = "MFkwEwYHKoZIzj0CAQYIKoEcz1UBgi0DQgAE6/ZmNaBRnZnisjtfxxh2r5F7MXjr2Rjf6wi5++WkUqU0APNadWN+jcZZeupwrkpOaS" +"+epBpYFwaHhlMGIbUzKw==";String privateKeyStr = "MIGTAgEAMBMGByqGSM49AgEGCCqBHM9VAYItBHkwdwIBAQQgsTwYNqhtSjlpYDQnaKaEQbn9kVdSW3RJnFejbKTYa5KgCgYIKoEcz1UBgi2hRANCAATr9mY1oFGdmeKyO1/HGHavkXsxeOvZGN/rCLn75aRSpTQA81p1Y36Nxll66nCuSk5pL56kGlgXBoeGUwYhtTMr";KeyFactory keyFactory = KeyFactory.getInstance("EC", BC);PublicKey publicKey = keyFactory.generatePublic(new X509EncodedKeySpec(Base64.decode(publicKeyStr)));PrivateKey privateKey = keyFactory.generatePrivate(new PKCS8EncodedKeySpec(Base64.decode(privateKeyStr)));SM_2 = SmUtil.sm2(privateKey, publicKey);} catch (Exception e) {log.info("SM2密钥初始化错误", e);}}/*** 文件加/解密** @param source 原始文件路径* @param out输出路径* @param fileName 输出文件名* @param action 行为（true为加密，false为解密）*/public static void encryptionOrDecryption(String source, String out, String fileName, boolean action) {byte[] bytes = FileUtils.fileToByte(source);byte[] data;if (action) {data = SM_2.encrypt(bytes, KeyType.PublicKey);} else {data = SM_2.decrypt(bytes, KeyType.PrivateKey);}FileUtils.byteToFile(data, out, fileName);}/*** 测试方法*/public static void main(String[] args) {// 加密encryptionOrDecryption("D:\\test\\test.pdf","D:\\test","encrypt.pdf",true);// 解密encryptionOrDecryption("D:\\test\\encrypt.pdf","D:\\test","decrypt.pdf",false);}}
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