基于bouncycastle的SM2加解密及签名验签实现

流沙QS

于 2025-02-06 11:34:10 发布

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分类专栏： Java专栏文章标签： java 服务器前端

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bouncycastle是几个强大的算法库，封装了诸多的加密算法。SM2等国密也已在其中实现。

依赖

JDK环境：jdk1.8_431

<dependency>
    <groupId>org.bouncycastle</groupId>
    <artifactId>bcprov-jdk15on</artifactId>
    <version>1.70</version>
</dependency>
<dependency>
    <groupId>org.bouncycastle</groupId>
    <artifactId>bcpkix-jdk15on</artifactId>
    <version>1.70</version>
</dependency>

代码实现

import org.bouncycastle.asn1.gm.GMNamedCurves;
import org.bouncycastle.asn1.gm.GMObjectIdentifiers;
import org.bouncycastle.asn1.x9.X9ECParameters;
import org.bouncycastle.jcajce.provider.asymmetric.ec.BCECPrivateKey;
import org.bouncycastle.jcajce.provider.asymmetric.ec.BCECPublicKey;
import org.bouncycastle.jcajce.provider.asymmetric.x509.CertificateFactory;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.jce.spec.ECParameterSpec;
import org.bouncycastle.jce.spec.ECPrivateKeySpec;
import org.bouncycastle.jce.spec.ECPublicKeySpec;
import org.bouncycastle.math.ec.ECPoint;
import org.bouncycastle.util.encoders.Hex;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import java.io.ByteArrayInputStream;
import java.math.BigInteger;
import java.security.*;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.security.spec.ECGenParameterSpec;
import java.security.spec.InvalidKeySpecException;
import java.util.Base64;

public class SM2Util {
    private final BouncyCastleProvider provider;
    // 获取SM2相关参数
    private final X9ECParameters parameters;
    // 椭圆曲线参数规格
    private final ECParameterSpec ecParameterSpec;
    // 获取椭圆曲线KEY生成器
    private final KeyFactory keyFactory;

    private SM2Util() throws NoSuchAlgorithmException {
        provider = new BouncyCastleProvider();
        parameters = GMNamedCurves.getByName("sm2p256v1");
        ecParameterSpec = new ECParameterSpec(parameters.getCurve(),
                parameters.getG(), parameters.getN(), parameters.getH());
        keyFactory = KeyFactory.getInstance("EC", provider);
    }

    /**
     * SM2算法生成密钥对
     *
     * @return 密钥对信息
     */
    public KeyPair generateSm2KeyPair() throws InvalidAlgorithmParameterException, NoSuchAlgorithmException {
        final ECGenParameterSpec sm2Spec = new ECGenParameterSpec("sm2p256v1");
        // 获取一个椭圆曲线类型的密钥对生成器
        final KeyPairGenerator kpg = KeyPairGenerator.getInstance("EC", provider);
        SecureRandom random = new SecureRandom();
        // 使用SM2的算法区域初始化密钥生成器
        kpg.initialize(sm2Spec, random);
        // 获取密钥对
        return kpg.generateKeyPair();
    }

    /**
     * SM2算法生成密钥对（Hex）
     *
     * @return 密钥对信息
     */
    public String[] generateSm2KeyPairHex() throws InvalidAlgorithmParameterException, NoSuchAlgorithmException {
        KeyPair keyPair = generateSm2KeyPair();
        BCECPrivateKey privateKey = (BCECPrivateKey) keyPair.getPrivate();
        BCECPublicKey publicKey = (BCECPublicKey) keyPair.getPublic();

        // 拿到密钥
        String pubKey = new String(Hex.encode(publicKey.getQ().getEncoded(false)));
        String prvKey = privateKey.getD().toString(16);
        return new String[]{pubKey, prvKey};
    }

    /**
     * 加密
     *
     * @param input  待加密文本
     * @param pubKey 公钥
     * @return
     */
    public String encode(String input, String pubKey)
            throws NoSuchPaddingException, NoSuchAlgorithmException,
            BadPaddingException, IllegalBlockSizeException,
            InvalidKeySpecException, InvalidKeyException {
        // 椭圆曲线参数规格
        ECParameterSpec ecParameterSpec = new ECParameterSpec(parameters.getCurve(), parameters.getG(), parameters.getN(), parameters.getH());
        // 将公钥HEX字符串转换为椭圆曲线对应的点
        ECPoint ecPoint = parameters.getCurve().decodePoint(Hex.decode(pubKey));
        // 获取椭圆曲线KEY生成器
        KeyFactory keyFactory = KeyFactory.getInstance("EC", provider);
        BCECPublicKey key = (BCECPublicKey) keyFactory.generatePublic(new ECPublicKeySpec(ecPoint, ecParameterSpec));
        // 获取SM2加密器
        Cipher cipher = Cipher.getInstance("SM2", provider);
        // 初始化为加密模式
        cipher.init(Cipher.ENCRYPT_MODE, key);
        // 加密并编码为base64格式
        return Base64.getEncoder().encodeToString(cipher.doFinal(input.getBytes()));
    }

    /**
     * 解密
     *
     * @param input  待解密文本
     * @param prvKey 私钥
     * @return
     */
    public byte[] decoder(String input, String prvKey) throws NoSuchPaddingException, NoSuchAlgorithmException,
            InvalidKeySpecException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
        // 获取SM2加密器
        Cipher cipher = Cipher.getInstance("SM2", provider);
        // 将私钥HEX字符串转换为X值
        BigInteger bigInteger = new BigInteger(prvKey, 16);
        BCECPrivateKey privateKey = (BCECPrivateKey) keyFactory.generatePrivate(new ECPrivateKeySpec(bigInteger,
                ecParameterSpec));
        // 初始化为解密模式
        cipher.init(Cipher.DECRYPT_MODE, privateKey);
        // 解密
        return cipher.doFinal(Base64.getDecoder().decode(input));
    }

    /**
     * 签名（私钥签名）
     *
     * @param plainText 待签名文本
     * @param prvKey    私钥
     * @return
     * @throws NoSuchAlgorithmException
     * @throws InvalidKeySpecException
     * @throws InvalidKeyException
     * @throws SignatureException
     */
    public String sign(String plainText, String prvKey) throws NoSuchAlgorithmException, InvalidKeySpecException,
            InvalidKeyException, SignatureException {
        // 创建签名对象
        Signature signature = Signature.getInstance(GMObjectIdentifiers.sm2sign_with_sm3.toString(), provider);
        // 将私钥HEX字符串转换为X值
        BigInteger bigInteger = new BigInteger(prvKey, 16);
        BCECPrivateKey privateKey = (BCECPrivateKey) keyFactory.generatePrivate(new ECPrivateKeySpec(bigInteger,
                ecParameterSpec));
        // 初始化为签名状态
        signature.initSign(privateKey);
        // 传入签名字节
        signature.update(plainText.getBytes());
        // 签名
        return Base64.getEncoder().encodeToString(signature.sign());
    }

    /**
     * 签名验签（公钥验签）
     *
     * @param plainText      待签名文本
     * @param signatureValue 签名值
     * @param pubKey         公钥
     * @return
     * @throws NoSuchAlgorithmException
     * @throws InvalidKeySpecException
     * @throws InvalidKeyException
     * @throws SignatureException
     */
    public boolean verify(String plainText, String signatureValue, String pubKey) throws NoSuchAlgorithmException, InvalidKeySpecException,
            InvalidKeyException, SignatureException {
        // 创建签名对象
        Signature signature = Signature.getInstance(GMObjectIdentifiers.sm2sign_with_sm3.toString(), provider);
        // 将公钥HEX字符串转换为椭圆曲线对应的点
        ECPoint ecPoint = parameters.getCurve().decodePoint(Hex.decode(pubKey));
        BCECPublicKey key = (BCECPublicKey) keyFactory.generatePublic(new ECPublicKeySpec(ecPoint, ecParameterSpec));
        // 初始化为验签状态
        signature.initVerify(key);
        signature.update(plainText.getBytes());
        return signature.verify(Base64.getDecoder().decode(signatureValue));
    }

    /**
     * 证书验签
     *
     * @param certStr      证书串
     * @param plaintext    签名原文
     * @param signValueStr 签名产生签名值 此处的签名值实际上就是 R和S的sequence
     * @return
     * @throws NoSuchAlgorithmException
     * @throws InvalidKeyException
     * @throws SignatureException
     */
    public boolean certVerify(String certStr, String plaintext, String signValueStr)
            throws NoSuchAlgorithmException, InvalidKeyException, SignatureException, CertificateException {
        byte[] signValue = Base64.getDecoder().decode(signValueStr);
        // 解析证书
        CertificateFactory factory = new CertificateFactory();
        X509Certificate certificate = (X509Certificate) factory
                .engineGenerateCertificate(new ByteArrayInputStream(Base64.getDecoder().decode(certStr)));
        // 验证签名
        Signature signature = Signature.getInstance(certificate.getSigAlgName(), provider);
        signature.initVerify(certificate);
        signature.update(plaintext.getBytes());
        return signature.verify(signValue);
    }
}

示例

public static void main(String[] args) throws InvalidAlgorithmParameterException, NoSuchAlgorithmException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, InvalidKeySpecException, InvalidKeyException, SignatureException {
    String str = "hello world!（你好世界！）";
    SM2Util sm2 = new SM2Util();
	// 生成密钥对
    String[] keyPair = sm2.generateSm2KeyPairHex();
    String pubKey = keyPair[0];
    String prvKey = keyPair[1];
    System.out.println("Private Key: " + prvKey);
    System.out.println("Public Key: " + pubKey);
    // 加解密测试
    System.out.println("加密前：" + str);
    String encode = sm2.encode(str, pubKey);
    System.out.println("加密后：" + encode);
    String decoder = new String(sm2.decoder(encode, prvKey));
    System.out.println("解密后：" + decoder);
    // 签名和验签测试
    System.out.println("签名源数据：" + str);
    String signStr = sm2.sign(str, prvKey);
    System.out.println("签名后数据：" + signStr);
    boolean verify = sm2.verify(decoder, signStr, pubKey);
    System.out.println("签名验证结果：" + verify);
}