vStationURM/Tools/NationalPlatformSync/SM2EncryptHelper.cs

using System;
using System.IO;
using System.Text;

namespace vCloud.Server.Utilities
{
    extern alias WCryptography;
    using WCryptography.Org.BouncyCastle.Asn1.X9;
    using WCryptography.Org.BouncyCastle.Crypto;
    using WCryptography.Org.BouncyCastle.Crypto.Engines;
    using WCryptography.Org.BouncyCastle.Crypto.Parameters;

    /// <summary>
    /// SM2加密
    /// </summary>
    public class SM2EncryptHelper
    {
        public static string _publicKeyPem = "";

        /// <summary>
        /// 初始化公钥
        /// </summary>
        /// <param name="publicKeyPem"></param>
        public static void Init(string publicKeyPem)
        {
            _publicKeyPem = publicKeyPem;
        }



        /// <summary>
        /// SM2加密，采用C1||C3||C2加密序列，使用SM3算法作为C3的一个坐标及明文的摘要值
        /// </summary>
        /// <param name="message"></param>
        /// <param name="publicKeyPem"></param>
        /// <returns>16进制的结果</returns>
        public static string Encrypt(string message)
        {
            try
            {
                if (string.IsNullOrEmpty(message))
                {
                    throw new ArgumentException("Message cannot be null or empty.", nameof(message));
                }

                if (string.IsNullOrEmpty(_publicKeyPem))
                {
                    throw new ArgumentException("Public key cannot be null or empty.", nameof(_publicKeyPem));
                }
                using (StringReader reader = new StringReader(_publicKeyPem))
                {
                    var pemReader = new WCryptography.Org.BouncyCastle.OpenSsl.PemReader(reader);
                    object obj = pemReader.ReadObject();
                    if (obj is AsymmetricKeyParameter keyParameter)
                    {
                        var q = ((ECPublicKeyParameters)keyParameter).Q;
                        var x9ec = ECNamedCurveTable.GetByName("sm2p256v1");
                        var publicParams = new ECPublicKeyParameters(q, new ECDomainParameters(x9ec));

                        // 创建SM2公钥加密器
                        var engine = new SM2Engine(SM2Engine.Mode.C1C3C2);
                        engine.Init(true, publicParams);

                        // 对消息进行编码
                        byte[] messageBytes = Encoding.UTF8.GetBytes(message);
                        byte[] cipherText = engine.ProcessBlock(messageBytes, 0, messageBytes.Length);

                        // 返回加密后的数据的base64表示
                        string hexString = BitConverter.ToString(cipherText).Replace("-", "").ToUpper();
                        return hexString;
                    }
                    else
                    {
                        throw new ArgumentException("Invalid public key format.", nameof(_publicKeyPem));
                    }
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("Encryption failed: " + ex.Message);
                return null;
            }
        }


    }
}