Java实现SM3withSM2签名和验证的基本示例

<dependency>
    <groupId>org.bouncycastle</groupId>
    <artifactId>bcprov-jdk15on</artifactId>
    <version>最新版本号</version>
</dependency>
<dependency>
    <groupId>org.bouncycastle</groupId>
    <artifactId>bcpkix-jdk15on</artifactId>
    <version>最新版本号</version>
</dependency>

import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.math.ec.ECPoint;
import org.bouncycastle.util.encoders.Hex;
 
import java.security.*;
import java.security.spec.ECGenParameterSpec;
 
public class SM2KeyPairGenerator {
    static {
        Security.addProvider(new BouncyCastleProvider());
    }
 
    public static KeyPair generateKeyPair() throws NoSuchAlgorithmException, NoSuchProviderException, InvalidAlgorithmParameterException, OperatorCreationException {
        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("EC", "BC");
        ECGenParameterSpec ecSpec = new ECGenParameterSpec("sm2p256v1");
        keyPairGenerator.initialize(ecSpec, new SecureRandom());
        return keyPairGenerator.generateKeyPair();
    }
 
    public static void main(String[] args) throws Exception {
        KeyPair keyPair = generateKeyPair();
        PublicKey publicKey = keyPair.getPublic();
        PrivateKey privateKey = keyPair.getPrivate();
 
        byte[] publicKeyBytes = publicKey.getEncoded();
        byte[] privateKeyBytes = privateKey.getEncoded();
 
        System.out.println("Public Key: " + Hex.toHexString(publicKeyBytes));
        System.out.println("Private Key: " + Hex.toHexString(privateKeyBytes));
    }
}

import org.bouncycastle.jce.interfaces.ECPrivateKey;
import org.bouncycastle.jce.interfaces.ECPublicKey;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.util.encoders.Hex;
 
import java.security.*;
import java.security.spec.MGF1ParameterSpec;
import java.security.spec.PSSParameterSpec;
 
public class SM3withSM2Example {
    static {
        Security.addProvider(new BouncyCastleProvider());
    }
 
    public static byte[] sm3Hash(String data) throws NoSuchAlgorithmException {
        MessageDigest digest = MessageDigest.getInstance("SM3", "BC");
        return digest.digest(data.getBytes());
    }
 
    public static byte[] signData(String data, PrivateKey privateKey) throws Exception {
        Signature signature = Signature.getInstance("SM3withSM2", "BC");
        signature.initSign(privateKey, new SecureRandom());
        signature.update(data.getBytes());
        return signature.sign();
    }
 
    public static boolean verifySignature(String data, byte[] signatureBytes, PublicKey publicKey) throws Exception {
        Signature signature = Signature.getInstance("SM3withSM2", "BC");
        signature.initVerify(publicKey);
        signature.update(data.getBytes());
        return signature.verify(signatureBytes);
    }
 
    public static void main(String[] args) throws Exception {
        String data = "Hello, SM2 and SM3!";
        KeyPair keyPair = SM2KeyPairGenerator.generateKeyPair();
        PrivateKey privateKey = keyPair.getPrivate();
        PublicKey publicKey = keyPair.getPublic();
 
        byte[] hash = sm3Hash(data);
        System.out.println("SM3 Hash: " + Hex.toHexString(hash));
 
        byte[] signature = signData(data, privateKey);
        System.out.println("Signature: " + Hex.toHexString(signature));
 
        boolean isVerified = verifySignature(data, signature, publicKey);
        System.out.println("Signature Verified: " + isVerified);
    }
}