????????國密算法是國家密碼局制定標(biāo)準(zhǔn)的一系列算法，包括SM1、SM2、SM3、SM4等。其中，SM1是采用硬件實現(xiàn)的，不予討論；SM2是非對稱加密算法；SM3是摘要算法；SM4是對稱加密算法。本篇貼出SM2?Java版本實現(xiàn)生成公私鑰及加解密、簽名驗簽代碼，供大家一起討論學(xué)習(xí)，所有的代碼實現(xiàn)都是基于BC庫來做的。
????????BC庫是實現(xiàn)加解密算法的基礎(chǔ)庫，我們首先要在代碼里引入BC庫

?? ? ? ? <dependency>
? ? ? ? ? ? <groupId>org.bouncycastle</groupId>
? ? ? ? ? ? <artifactId>bcprov-jdk15on</artifactId>
? ? ? ? ? ? <version>1.69</version>
? ? ? ? </dependency>

? ? ? ? 下面是整個工具類，實現(xiàn)密鑰生成，加解密及簽名驗簽功能文章來源地址http://www.zghlxwxcb.cn/news/detail-503778.html

import org.apache.commons.codec.binary.Base64;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.engines.SM2Engine;
import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
import org.bouncycastle.crypto.params.ECPublicKeyParameters;
import org.bouncycastle.crypto.params.ParametersWithRandom;
import org.bouncycastle.crypto.signers.SM2Signer;
import org.bouncycastle.jcajce.provider.asymmetric.util.ECUtil;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.security.*;
import java.security.spec.ECGenParameterSpec;
import java.security.spec.KeySpec;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

public class Sm2Utils {

    private static Logger log = LoggerFactory.getLogger(Sm2Utils.class);

    /**
     * SM2算法生成密鑰對
     *
     * @return 密鑰對信息
     */
    public static KeyPair generateSm2KeyPair() {
        try {
            final ECGenParameterSpec sm2Spec = new ECGenParameterSpec("prime256v1");
            final KeyPairGenerator kpg = KeyPairGenerator.getInstance("EC", new BouncyCastleProvider());
            SecureRandom random = new SecureRandom();
            kpg.initialize(sm2Spec, random);
            KeyPair keyPair = kpg.generateKeyPair();
            return keyPair;
        } catch (Exception e) {
            log.error("generate sm2 key pail failed:", e.getMessage(), e);
            throw  new RuntimeException("生成密鑰對失敗");
        }
    }

    /**
     * sm2公鑰加密
     *
     * @param data
     * @param key
     * @return
     * @throws Exception
     */
    public static byte[] encrypt(byte[] data, byte[] key) throws Exception {
        KeySpec keySpec = new X509EncodedKeySpec(key);
        PublicKey publicKey = KeyFactory.getInstance("EC", new BouncyCastleProvider()).generatePublic(keySpec);
        ECPublicKeyParameters parameters = (ECPublicKeyParameters) ECUtil.generatePublicKeyParameter(publicKey);
        CipherParameters pubKeyParameters = new ParametersWithRandom(parameters);
        SM2Engine engine = new SM2Engine(SM2Engine.Mode.C1C2C3);
        engine.init(true, pubKeyParameters);
        return engine.processBlock(data, 0, data.length);
    }


    /**
     * sm2私鑰解密
     * @param data
     * @param key
     * @return
     * @throws Exception
     */
    public static byte[] decrypt(byte[] data, byte[] key) throws Exception {
        KeySpec keySpec = new PKCS8EncodedKeySpec(key);
        KeyFactory keyfactory = KeyFactory.getInstance("EC", new BouncyCastleProvider());
        PrivateKey privateKey = keyfactory.generatePrivate(keySpec);
        CipherParameters privateKeyParameters = ECUtil.generatePrivateKeyParameter(privateKey);
        SM2Engine engine = new SM2Engine(SM2Engine.Mode.C1C2C3);
        engine.init(false, privateKeyParameters);
        byte[] byteDate = engine.processBlock(data, 0, data.length);
        return byteDate;
    }

    /**
     * 私鑰簽名
     * @param data
     * @param key
     * @return
     * @throws Exception
     */

    public static byte[] sign(byte[] data, byte[] key) throws Exception {
        SM2Signer signer = new SM2Signer();
        KeySpec keySpec = new PKCS8EncodedKeySpec(key);
        KeyFactory keyfactory = KeyFactory.getInstance("EC", new BouncyCastleProvider());
        PrivateKey privateKey =  keyfactory.generatePrivate(keySpec);
        ECPrivateKeyParameters keyParameters = (ECPrivateKeyParameters) ECUtil.generatePrivateKeyParameter(privateKey);
        CipherParameters param = new ParametersWithRandom(keyParameters);
        signer.init(true, param);
        signer.update(data, 0, data.length);
        return signer.generateSignature();
    }

    /**
     * 公鑰驗簽
     * @param data
     * @param sign
     * @param key
     * @return
     * @throws Exception
     */
    public static boolean verify(byte[] data, byte[] sign, byte[] key) throws Exception {
        SM2Signer signer = new SM2Signer();
        KeySpec keySpec = new X509EncodedKeySpec(key);
        PublicKey publicKey = KeyFactory.getInstance("EC", new BouncyCastleProvider()).generatePublic(keySpec);
        CipherParameters param =  ECUtil.generatePublicKeyParameter(publicKey);
        signer.init(false, param);
        signer.update(data, 0, data.length);
        return signer.verifySignature(sign);
    }


    public static void main(String[] args) throws Exception {
        KeyPair keyPair = generateSm2KeyPair();//生成密鑰
        String publicKey = Base64.encodeBase64String(keyPair.getPublic().getEncoded());
        String privateKey = Base64.encodeBase64String(keyPair.getPrivate().getEncoded());
        System.out.println("sm2公鑰=" + publicKey);
        System.out.println("sm2私鑰=" + privateKey);
        String plaintext = "test";//明文
        String signature = Base64.encodeBase64String((sign(plaintext.getBytes("utf-8"),keyPair.getPrivate().getEncoded())));
        String ciphertext = Base64.encodeBase64String(encrypt(plaintext.getBytes("utf-8"), Base64.decodeBase64(publicKey)));
        System.out.println("ciphertext: " + ciphertext);
        System.out.println("signature: " + signature);
        boolean result = verify(plaintext.getBytes("utf-8"),Base64.decodeBase64(signature),keyPair.getPublic().getEncoded());
        plaintext = new String(decrypt(Base64.decodeBase64(ciphertext), Base64.decodeBase64(privateKey)), "utf-8");
        System.out.println("plaintext: " + plaintext);
        System.out.println("verify result: " + result);
    }

}

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