国密算法SM2签名、SM2验证签名示例

好的，我可以为你提供国密算法SM2的签名和验证签名示例。以下是示例代码：

签名示例（使用Java语言）：

import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
import org.bouncycastle.crypto.CryptoException;
import org.bouncycastle.crypto.digests.SM3Digest;
import org.bouncycastle.crypto.engines.SM2Engine;
import org.bouncycastle.crypto.generators.ECKeyPairGenerator;
import org.bouncycastle.crypto.params.*;
import org.bouncycastle.crypto.signers.SM2Signer;
import org.bouncycastle.jce.provider.BouncyCastleProvider;

import java.math.BigInteger;
import java.security.*;
import java.security.spec.ECGenParameterSpec;

public class SM2SignatureExample {
    public static void main(String[] args) {
        Security.addProvider(new BouncyCastleProvider());

        try {
            // 生成密钥对
            KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("EC", "BC");
            ECGenParameterSpec ecGenParameterSpec = new ECGenParameterSpec("sm2p256v1");
            keyPairGenerator.initialize(ecGenParameterSpec, new SecureRandom());
            KeyPair keyPair = keyPairGenerator.generateKeyPair();

            // 获取私钥和公钥
            PrivateKey privateKey = keyPair.getPrivate();
            PublicKey publicKey = keyPair.getPublic();

            // 待签名的数据
            byte[] data = "Hello, SM2!".getBytes();

            // 执行签名操作
            SM2Signer signer = new SM2Signer();            signer.init(true, new ParametersWithRandom(privateKey, new SecureRandom()));
            signer.update(data, 0, data.length);
            byte[] signature = signer.generateSignature();

            System.out.println("签名值: " + new BigInteger(1,