c++实现sm2和base64解密

Question

就我想把通过java那边先通过sm2算法加密获取内容，在经过base64编码后的密文通过c++代码解密出来，java那边加密和解密的流程是这样的，现在给了我个密文为BNMcl56sscM7IkViF/xo/NBazYLAFOQGeCXbb9s/bmEjUn+tDW0NJjvrNZBpfGHIzp/ykGOKxf1S2wxC043GM0hYKvAClYTUZENppcNLgnmSf4Uv4q9YisFVc4NowbOHACRDtMluJ1fCVXo= ，明文为demo，怎么通过c++的代码实现解密的流程(不要用ai)

//私钥
   private static final String privateKeyStr = "MIGTAgEAMBMGByqGSM49AgEGCCqBHM9VAYItBHkwdwIBAQQg84+DlFPtZ+gM5RW66O0FYPKD5udg91Eog67Kj43BjdKgCgYIKoEcz1UBgi2hRANCAAQQckJs4NWcjekZrtdASqgo6UctMPva7fYHthAn+zty6iAtIz/vALlNEJBs+lEORElzOCA/SjZqyJ9aLHXjjIFB";
//公钥
  private static final String publicKeyStr = "MFkwEwYHKoZIzj0CAQYIKoEcz1UBgi0DQgAEEHJCbODVnI3pGa7XQEqoKOlHLTD72u32B7YQJ/s7cuogLSM/7wC5TRCQbPpRDkRJczggP0o2asifWix144yBQQ==";
   /**
     * SM2加密算法
     *
     * @param data 明文数据
     * @return
     */
    public static String encrypt(String data) {
        PublicKey publicKey = null;
        try {
            byte[] keyBytes;
            keyBytes = (new BASE64Decoder()).decodeBuffer(publicKeyStr);
            KeyFactory keyFactory = KeyFactory.getInstance("EC", BouncyCastleProvider.PROVIDER_NAME);
            X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
            publicKey = keyFactory.generatePublic(keySpec);
        } catch (Exception e) {
            log.error("SM2字符串公钥转换异常：{}", e.getMessage());
            e.printStackTrace();
        }
        ECPublicKeyParameters ecPublicKeyParameters = null;
        if (publicKey instanceof BCECPublicKey) {
            BCECPublicKey bcecPublicKey = (BCECPublicKey) publicKey;
            ECParameterSpec ecParameterSpec = bcecPublicKey.getParameters();
            ECDomainParameters ecDomainParameters = new ECDomainParameters(ecParameterSpec.getCurve(),
                    ecParameterSpec.getG(), ecParameterSpec.getN());
            ecPublicKeyParameters = new ECPublicKeyParameters(bcecPublicKey.getQ(), ecDomainParameters);
        }
        SM2Engine sm2Engine = new SM2Engine();
        sm2Engine.init(true, new ParametersWithRandom(ecPublicKeyParameters, new SecureRandom()));
        byte[] arrayOfBytes = null;
        try {
            byte[] in = data.getBytes(StandardCharsets.UTF_8);
            arrayOfBytes = sm2Engine.processBlock(in, 0, in.length);
        } catch (Exception e) {
            log.error("SM2加密时出现异常:{}", e.getMessage());
        }
        return Base64.encodeBase64String(arrayOfBytes);
    }

   /**
     * SM2解密算法
     *
     * @param cipherData 密文数据
     * @return
     */
public static String decrypt(String cipherData) {
    PrivateKey privateKey = null;
    byte[] keyBytes;
    try {
        keyBytes = (new BASE64Decoder()).decodeBuffer(privateKeyStr);  // 将私钥字符串进行 Base64 解码
        KeyFactory keyFactory = KeyFactory.getInstance("EC", BouncyCastleProvider.PROVIDER_NAME);
        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
        privateKey = keyFactory.generatePrivate(keySpec);  // 使用解码后的字节数组生成私钥对象
    } catch (Exception e) {
        log.error("SM2字符串私钥转换异常：{}", e.getMessage());
        e.printStackTrace();
    }

    BCECPrivateKey bcecPrivateKey = (BCECPrivateKey) privateKey;
    ECParameterSpec ecParameterSpec = bcecPrivateKey.getParameters();
    ECDomainParameters ecDomainParameters = new ECDomainParameters(ecParameterSpec.getCurve(),
            ecParameterSpec.getG(), ecParameterSpec.getN());
    ECPrivateKeyParameters ecPrivateKeyParameters = new ECPrivateKeyParameters(bcecPrivateKey.getD(),
            ecDomainParameters);  // 使用私钥对象创建 SM2 解密需要的 ECPrivateKeyParameters

    SM2Engine sm2Engine = new SM2Engine();
    sm2Engine.init(false, ecPrivateKeyParameters);  // 初始化 SM2 引擎，使用私钥参数

    String result = null;
    byte[] arrayOfBytes = null;
    try {
        byte[] in = Base64.decodeBase64(cipherData);  // 对密文进行 Base64 解码
        arrayOfBytes = sm2Engine.processBlock(in, 0, in.length);  // 对解码后的密文进行 SM2 解密
        result = new String(arrayOfBytes, StandardCharsets.UTF_8);  // 将解密结果转换为字符串
    } catch (Exception e) {
        log.error("SM2字符串私钥解密异常：{}", e.getMessage());
        e.printStackTrace();
    }

    return result;  // 返回解密结果
}

Answer 1

看看是否解出