国密sm2签名java

国密SM2签名Java实现

1. 流程图

stateDiagram
    [*] --> 生成密钥对
    生成密钥对 --> 签名
    签名 --> 验证签名
    验证签名 --> [*]

2. 详细步骤

2.1 生成密钥对

首先，我们需要使用Java的加密库来生成国密SM2的密钥对。在Java中，可以使用Bouncy Castle库来实现SM2算法的密钥对生成。

首先，需要引入Bouncy Castle库的依赖，在pom.xml文件中添加以下内容：

<dependencies>
    <dependency>
        <groupId>org.bouncycastle</groupId>
        <artifactId>bcpkix-jdk15on</artifactId>
        <version>1.68</version>
    </dependency>
</dependencies>

接下来，我们可以编写代码来生成SM2的密钥对：

import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
import org.bouncycastle.crypto.generators.ECKeyPairGenerator;
import org.bouncycastle.crypto.params.ECKeyGenerationParameters;
import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
import org.bouncycastle.crypto.params.ECPublicKeyParameters;
import org.bouncycastle.crypto.util.PrivateKeyFactory;
import org.bouncycastle.crypto.util.PublicKeyFactory;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.jce.spec.ECNamedCurveParameterSpec;

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

public class SM2KeyGenerator {

    public static void main(String[] args) throws Exception {
        // 添加Bouncy Castle作为Provider
        Security.addProvider(new BouncyCastleProvider());

        // 创建EC参数
        ECNamedCurveParameterSpec spec = org.bouncycastle.jce.ECNamedCurveTable.getParameterSpec("sm2p256v1");

        // 创建密钥对生成器
        ECKeyPairGenerator generator = new ECKeyPairGenerator();
        ECKeyGenerationParameters generationParameters = new ECKeyGenerationParameters(spec, null);
        generator.init(generationParameters);

        // 生成密钥对
        AsymmetricCipherKeyPair keyPair = generator.generateKeyPair();
        ECPrivateKeyParameters privateKeyParams = (ECPrivateKeyParameters) keyPair.getPrivate();
        ECPublicKeyParameters publicKeyParams = (ECPublicKeyParameters) keyPair.getPublic();

        // 使用PublicKeyFactory和PrivateKeyFactory将密钥转换成Java的Key对象
        KeyPair keyPair = new KeyPair(
                PublicKeyFactory.createKey(publicKeyParams),
                PrivateKeyFactory.createKey(privateKeyParams));

        // 输出密钥对
        System.out.println("公钥：" + Base64.getEncoder().encodeToString(keyPair.getPublic().getEncoded()));
        System.out.println("私钥：" + Base64.getEncoder().encodeToString(keyPair.getPrivate().getEncoded()));
    }
}

2.2 签名

在生成了密钥对之后，我们可以使用私钥对数据进行签名。首先，我们需要准备待签名的数据和私钥。

import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.digests.SM3Digest;
import org.bouncycastle.crypto.engines.SM2Engine;
import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
import org.bouncycastle.crypto.params.ParametersWithRandom;
import org.bouncycastle.crypto.signers.SM2Signer;
import org.bouncycastle.jce.provider.BouncyCastleProvider;

import java.security.KeyPair;
import java.security.Security;

public class SM2SignerExample {

    public static void main(String[] args) throws Exception {
        // 添加Bouncy Castle作为Provider
        Security.addProvider(new BouncyCastleProvider());

        // 准备待签名的数据和密钥对
        byte[] data = "Hello World".getBytes("UTF-8");
        KeyPair keyPair = generateKeyPair();

        // 创建SM2签名器
        SM2Signer signer = new SM2Signer();

        // 初始化签名器
        CipherParameters parameters = new ParametersWithRandom(
                new AsymmetricKeyParameter(true, keyPair.getPrivate()), new SecureRandom());
        signer.init(true, parameters);

        // 计算待签名数据的SM3摘要
        Digest digest = new SM3Digest();
        byte[] digestData = new byte[digest.getDigestSize()];
        digest.update(data, 0, data.length);
        digest.doFinal(digestData, 0);

        // 对待签名数据进行签名
        signer.update(digestData, 0, digestData.length);
        byte[] signature = signer.generateSignature();

        // 输出签名结果
        System.out.println("签名：" + Base64.getEncoder().encodeToString(signature));
    }

    private