SM2加密解密 java实现

要在Java中实现SM2加密解密，您可以使用bcprov库。在使用之前，您需要确保已经导入了bcprov-ext-jdk15on-151.jar和bcprov-jdk15on-151.jar这两个包。

首先，您需要生成SM2的密钥对。可以使用以下代码生成密钥对：

import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.util.encoders.Hex;

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

public class SM2Example {
    public static void main(String[] args) throws Exception {
        Security.addProvider(new BouncyCastleProvider());

        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("SM2", "BC");
        KeyPair keyPair = keyPairGenerator.generateKeyPair();

        byte[] publicKey = keyPair.getPublic().getEncoded();
        byte[] privateKey = keyPair.getPrivate().getEncoded();

        System.out.println("公钥: " + Hex.toHexString(publicKey));
        System.out.println("私钥: " + Hex.toHexString(privateKey));
    }
}

然后，您可以使用以下代码进行SM2加密和解密：

import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.crypto.InvalidCipherTextException;
import org.bouncycastle.crypto.engines.SM2Engine;
import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
import org.bouncycastle.crypto.params.ECPublicKeyParameters;
import org.bouncycastle.crypto.util.PrivateKeyInfoFactory;
import org.bouncycastle.crypto.util.SubjectPublicKeyInfoFactory;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.util.encoders.Hex;

import java.security.KeyFactory;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Security;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

public class SM2Example {
    public static void main(String[] args) throws Exception {
        Security.addProvider(new BouncyCastleProvider());

        // 加载公钥和私钥
        byte[] publicKeyBytes = Hex.decode("公钥");
        byte[] privateKeyBytes = Hex.decode("私钥");

        KeyFactory keyFactory = KeyFactory.getInstance("SM2", "BC");
        X509EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(publicKeyBytes);
        PublicKey publicKey = keyFactory.generatePublic(publicKeySpec);

        PKCS8EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(privateKeyBytes);
        PrivateKey privateKey = keyFactory.generatePrivate(privateKeySpec);

        // 加密
        SM2Engine engine = new SM2Engine();
        engine.init(true, new ECPublicKeyParameters((ECPublicKey) publicKey, SM2Util.DOMAIN_PARAMETERS));

        byte[] plaintext = "要加密的数据".getBytes();
        byte[] encrypted = engine.processBlock(plaintext, 0, plaintext.length);

        System.out.println("加密结果: " + Hex.toHexString(encrypted));

        // 解密
        engine.init(false, new ECPrivateKeyParameters((ECPrivateKey) privateKey, SM2Util.DOMAIN_PARAMETERS));

        byte[] decrypted = engine.processBlock(encrypted, 0, encrypted.length);

        System.out.println("解密结果: " + new String(decrypted));
    }
}

请注意，这只是一个基础的示例，您可能需要根据您的具体需求进行修改和完善。另外，您还可以通过了解更多关于bcprov库的文档和示例来深入学习和使用SM2加密解密。<span class="em">1</span>
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