using System;
using System.Text;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Utilities.Encoders;

namespace AnHuiMI.Common
{
    class SignUtils
    {
		public static string signSm3WithSm2(string chnlId, string sm4key, string prvkey, string data)
		{
			ECPrivateKeyParameters privatekeyFromD = GmUtil.GetPrivatekeyFromD(new BigInteger(Convert.FromBase64String(prvkey)));
			return Convert.ToBase64String(GmUtil.SignSm3WithSm2(Encoding.UTF8.GetBytes(data), Encoding.UTF8.GetBytes(sm4key), privatekeyFromD));
		}

		public static bool verifySm3WithSm2(string msg, string sm4key, string signData, string pubKey)
		{
			byte[] array = Convert.FromBase64String(pubKey);
			BitConverter.ToString(array);
			AsymmetricKeyParameter publickeyFromXY = GmUtil.GetPublickeyFromXY(array);
			byte[] rs = Convert.FromBase64String(signData);
			return GmUtil.VerifySm3WithSm2(Encoding.UTF8.GetBytes(msg), Encoding.UTF8.GetBytes(sm4key), rs, publickeyFromXY);
		}

		public static string getSignText(string chnlId, string sm4key, string data,long ts)
		{
			JObject jobject = new JObject();
			jobject.Add("appId", chnlId);
			jobject.Add("data", data);
			jobject.Add("encType", "SM4");
			jobject.Add("signType", "SM2");
			jobject.Add("timestamp", ts); ;
			jobject.Add("version", "2.0.1");

			string value = StringUtils.SortJson(jobject.ToString());

			return StringUtils.Json2sign(value) + "&key=" + sm4key;
		}

		public static string encryptMsg(string chnlId, string sm4key, string prvkey, string data, ref string rtSignPlain)
		{
			long ts = StringUtils.CurrentTimeStamp();
			string signText = SignUtils.getSignText(chnlId, sm4key, data,ts);
			string signData = SignUtils.signSm3WithSm2(chnlId, sm4key, prvkey, signText);
			string encData = SignUtils.sm4Encrypt(chnlId, sm4key, data);
			JObject jobject = new JObject();
			jobject.Add("appId", chnlId);
			jobject.Add("encData", encData);
			jobject.Add("encType", "SM4");
			jobject.Add("signData", signData);
			jobject.Add("signType", "SM2");
			jobject.Add("timestamp", ts);
			jobject.Add("version", "2.0.1");
			rtSignPlain = signData;

			return jobject.ToString(Formatting.None, null);
		}

		public static string encryptMsg(string chnlId, string sm4key, string prvkey, string data)
		{
			long ts = StringUtils.CurrentTimeStamp();
			string signText = SignUtils.getSignText(chnlId, sm4key, data, ts);
			string value = SignUtils.signSm3WithSm2(chnlId, sm4key, prvkey, signText);
			string value2 = SignUtils.sm4Encrypt(chnlId, sm4key, data);
			return new JObject
			{
				{
					"appId",
					chnlId
				},
				{
					"encData",
					value2
				},
				{
					"encType",
					"SM4"
				},
				{
					"signData",
					value
				},
				{
					"signType",
					"SM2"
				},
				{
					"timestamp",
					ts
				},
				{
					"version",
					"2.0.1"
				}
			}.ToString(Formatting.None, null);
		}

		public static string sm4Encrypt(string chnlId, string sm4key, string message)
		{
			byte[] bytes = Encoding.UTF8.GetBytes(chnlId.Substring(0, 16));
			byte[] bytes2 = Encoding.UTF8.GetBytes(sm4key);
			byte[] bytes3 = Encoding.UTF8.GetBytes(message);
			string text = Hex.ToHexString(GmUtil.Sm4EncryptECB(bytes, bytes2, "SM4/ECB/PKCS7Padding")).ToUpper();
			return Hex.ToHexString(GmUtil.Sm4EncryptECB(Encoding.UTF8.GetBytes(text.Substring(0, 16)), bytes3, "SM4/ECB/PKCS7Padding"));
		}

		public static string sm4Decrypt(string chnlId, string sm4key, string message)
		{
			byte[] bytes = Encoding.UTF8.GetBytes(chnlId.Substring(0, 16));
			byte[] bytes2 = Encoding.UTF8.GetBytes(sm4key);
			byte[] cipher = Hex.Decode(message);
			string text = BitConverter.ToString(GmUtil.Sm4EncryptECB(bytes, bytes2, "SM4/ECB/PKCS7Padding"), 0).Replace("-", string.Empty).ToUpper();
			byte[] bytes3 = GmUtil.Sm4DecryptECB(Encoding.UTF8.GetBytes(text.Substring(0, 16)), cipher, "SM4/ECB/PKCS7Padding");
			return Encoding.UTF8.GetString(bytes3);
		}
	}
}