1. 使用BC库1.59版本已经可以支持国密算法SM2/SM3/SM4，某大神写的详细测试例子：/ZZMarquis/gmhelper
2.制作证书参考网上资料简单例子;
``` java
public static void genSM2CertBySelf() throws OperatorCreationException, IOException, CertificateException {
String dn = "CN=dfg, OU=aert, O=45y, L=sdfg, ST=fg, C=CN";
long year = 360 * 24 * 60 * 60 * 1000;
Date notBefore = new Date();
Date notAfter = new Date(notBefore.getTime() + year);
//证书的名称
String fileName = "self"+new Date().getTime()/1000;
String path = "/test/gmhelper/";
String rootCertPath = path+fileName+".der";
AsymmetricCipherKeyPair kp = Sm2Util.generateKeyPair();
ECPrivateKeyParameters bcecPrivateKey = (ECPrivateKeyParameters)kp.getPrivate();
ECPublicKeyParameters bcecPublicKey = (ECPublicKeyParameters)kp.getPublic();
BcX509v3CertificateBuilder build = new BcX509v3CertificateBuilder(
new X500Name(dn),
BigInteger.probablePrime(64, new Random()),
notBefore,
notAfter,
new X500Name(dn),
bcecPublicKey);
AlgorithmIdentifier sigAlgId = new DefaultSignatureAlgorithmIdentifierFinder().find("SM3withSM2");//即"1.2.156.10197.1.501"
AlgorithmIdentifier digAlgId = new DefaultDigestAlgorithmIdentifierFinder().find("SHA256");
ContentSigner sigGen = new BcECContentSignerBuilder(sigAlgId, digAlgId).build(bcecPrivateKey);
X509CertificateHolder x509certHolder = build.build(sigGen);
FileOutputStream outputStream = new FileOutputStream(rootCertPath);
outputStream.write(x509certHolder.getEncoded());
outputStream.close();
}
```
3. 使用上面介绍的制作证书方法如果跟GMSSL生成的证书比对缺少“公钥参数”对象，因为BC库公钥是采用X9.62格式，见rfc5349/html/rfc5349 ; 如果一定要带公钥参数对象，代码去处理下ASN.1，把BcX509v3CertificateBuilder修改为X509v3CertificateBuilder，公钥通过createSubjectECPublicKeyInfo做下转换
``` java
public static SubjectPublicKeyInfo createSubjectECPublicKeyInfo(ECPublicKeyParameters pub)
{
ASN1OctetString p = (ASN1OctetString)new X9ECPoint(pub.getQ()).toASN1Primitive();
return new SubjectPublicKeyInfo(new AlgorithmIdentifier(X9ObjectIdentifiers.id_ecPublicKey, GMObjectIdentifiers.sm2p256v1), p.getOctets());
}
```
4. 自己如何构造公钥参数ECPublicKeyParameters参考：/blog/2389904 如果要构造私钥参数类似如此操作，更简单，因为私钥参数ECPrivateKeyParameters只有一个大数BigInteger
5.证书解析参考：/qq_32221419/article/details/59111828
6、证书请求及其它：参考/?post=54 和
/jinhill/article/details/17612273
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