前端VUE后端JAVA，SM2加解密，一篇解决你的问题

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一、后端JAVA

1、在pom.xml中添加

 <dependency>    <groupId>cn.hutool</groupId>    <artifactId>hutool-all</artifactId></dependency><dependency>    <groupId>org.bouncycastle</groupId>    <artifactId>bcprov-jdk15on</artifactId>    <version>1.68</version></dependency><!-- bcprov-jdk15 加密工具--><dependency>    <groupId>org.bouncycastle</groupId>    <artifactId>bcprov-jdk15to18</artifactId>    <version>1.69</version></dependency>

2、sm2工具类

public class Sm2Util {    //生成秘钥对    public static MutablePair<String, String> createSM2Key(){        SM2 sm2= SmUtil.sm2();        sm2.setMode(SM2Engine.Mode.C1C3C2);        String privateKey= HexUtil.encodeHexStr(BCUtil.encodeECPrivateKey(sm2.getPrivateKey()));        String publicKey = HexUtil.encodeHexStr(((BCECPublicKey) sm2.getPublicKey()).getQ().getEncoded(false));        return MutablePair.of(publicKey,privateKey);    }    //加密    public static String encrypt(String data, String publicKey){        String publicKeyTmp = publicKey;        if (publicKey.length() == 130) {            //这里需要去掉开始第一个字节 第一个字节表示标记            publicKeyTmp = publicKey.substring(2);        }        String xhex = publicKeyTmp.substring(0, 64);        String yhex = publicKeyTmp.substring(64, 128);        ECPublicKeyParameters ecPublicKeyParameters = BCUtil.toSm2Params(xhex, yhex);        //创建sm2 对象        SM2 sm2 = new SM2(null, ecPublicKeyParameters);        sm2.usePlainEncoding();        sm2.setMode(SM2Engine.Mode.C1C3C2);        return sm2.encryptHex(data, KeyType.PublicKey);    }    //解密    public static String decrypt(String data, String privateKey){        SM2 sm2 = new SM2(ECKeyUtil.toSm2PrivateParams(privateKey), null);        sm2.setMode(SM2Engine.Mode.C1C3C2);        sm2.setEncoding(new PlainDSAEncoding());        String encryptStr = sm2.decryptStr(data, KeyType.PrivateKey);        return encryptStr;    }

二、前端VUE

1.安装依赖 gm-crypto

npm install gm-crypto

2.加解密方法

import { SM2} from "gm-crypto";//加密方法//plaintext为待加密数据//publicKey 为加密公钥const data =      "04" +      SM2.encrypt(plaintext, publicKey, {        inputEncoding: "utf8",        outputEncoding: "hex"      });//解密方法// ciphertext :密文// privateKey :解密私钥data = SM2.decrypt(      ciphertext.substring(2, ciphertext.length),      privateKey,      {        inputEncoding: "hex",        outputEncoding: "utf8"      }    );

三、避坑指南

1、后端加密后密文前两位为“04”,前端解密不了，所以在前端解密时要把“04”去掉，

2、前端加密后，密文没有“04”，所以前端加密完要在密文前面加上“04”

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