前后端联调sm2加密的坑Invalid point encoding

1.公私钥问题

Invalid point encoding

私钥前加00，密文前加04，公钥前加04

后端使用hutool

<dependency><groupId>cn.hutool</groupId><artifactId>hutool-all</artifactId><version>5.7.12</version></dependency><dependency><groupId>org.bouncycastle</groupId><artifactId>bcprov-jdk15on</artifactId><version>1.68</version></dependency>

后端生成公私钥，公钥已带有04，私钥已带有00

SM2 sm2=newSM2();BCECPrivateKey privateKey =(BCECPrivateKey)(sm2.getPrivateKey());//私钥对应D值，EC为椭圆算法//hutool-all-5.7.12-sources.jar!/cn/hutool/crypto/asymmetric/SM2.java:90//hutool-all-5.7.12-sources.jar!/cn/hutool/crypto/ECKeyUtil.java:346BigInteger d = privateKey.getD();BCECPublicKey publicKey =(BCECPublicKey) sm2.getPublicKey();//公钥对应Q值//hutool-all-5.7.12-sources.jar!/cn/hutool/crypto/asymmetric/SM2.java:90//hutool-all-5.7.12-sources.jar!/cn/hutool/crypto/ECKeyUtil.java:379ECPoint q = publicKey.getQ();String hutoolPrivateKeyHex =HexUtil.encodeHexStr(BCUtil.encodeECPrivateKey(privateKey));String hutoolPublicKeyHex =HexUtil.encodeHexStr(q.getEncoded(false));

D,Q是什么

sm2为椭圆算法
公钥对应Q值
私钥对应D值
hutool算法，先尝试D值=>再尝试PKCS#8=>尝试PKCS#1

hutool源码

publicstaticECPrivateKeyParametersdecodePrivateKeyParams(byte[] privateKeyBytes){try{// 尝试D值returntoSm2PrivateParams(privateKeyBytes);}catch(Exception ignore){// ignore}PrivateKey privateKey;//尝试PKCS#8try{
            privateKey =KeyUtil.generatePrivateKey("sm2", privateKeyBytes);}catch(Exception ignore){// 尝试PKCS#1
            privateKey =KeyUtil.generatePrivateKey("sm2",createOpenSSHPrivateKeySpec(privateKeyBytes));}returntoPrivateParams(privateKey);}