java SM4 秘钥生成

以下是Java中使用SM4算法生成密钥的示例代码：

import org.bouncycastle.crypto.generators.SM2KeyPairGenerator;
import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
import org.bouncycastle.crypto.params.ECPublicKeyParameters;
import org.bouncycastle.crypto.params.SM2KeyGenerationParameters;
import org.bouncycastle.jce.provider.BouncyCastleProvider;

import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.Security;

public class SM4KeyGenerator {
    public static void main(String[] args) throws NoSuchProviderException, NoSuchAlgorithmException {
        Security.addProvider(new BouncyCastleProvider());

        // 生成SM2密钥对
        SM2KeyPairGenerator gen = new SM2KeyPairGenerator();
        SM2KeyGenerationParameters sm2kgp = new SM2KeyGenerationParameters();
        gen.init(sm2kgp);
        KeyPair keyPair = gen.generateKeyPair();
        ECPublicKeyParameters ecPublicKeyParameters = (ECPublicKeyParameters) keyPair.getPublic();
        ECPrivateKeyParameters ecPrivateKeyParameters = (ECPrivateKeyParameters) keyPair.getPrivate();

        // 输出SM2公钥和私钥
        System.out.println("SM2公钥: " + ecPublicKeyParameters.getQ().toString());
        System.out.println("SM2私钥: " + ecPrivateKeyParameters.getD().toString());
    }
}

上述代码中，我们使用了Bouncy Castle作为Java的加密提供者，并使用SM2KeyPairGenerator生成SM2密钥对。最后，我们输出了生成的SM2公钥和私钥。