Merge pull request #13 from Web3Auth/session-management

Session management

Assets/Plugins/Web3AuthSDK/Api/Models/LogoutApiRequest.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class LogoutApiRequest
+{
+    public string key { get; set; }
+    public string data { get; set; }
+    public string signature { get; set; }
+    public long timeout { get; set; }
+}

Assets/Plugins/Web3AuthSDK/Api/Models/StoreApiResponse.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class StoreApiResponse {
+    public string message { get; set; }
+    public bool success { get; set; }
+}

Assets/Plugins/Web3AuthSDK/Api/Web3AuthApi.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using System.Net.Http;
+using System;
+using Newtonsoft.Json.Linq;
+using Newtonsoft.Json;
+using System.Text;
+
+public class Web3AuthApi
+{
+    static Web3AuthApi instance;
+    static Uri baseAddress = new Uri("https://broadcast-server.tor.us");
+
+    public static Web3AuthApi getInstance()
+    {
+        if (instance == null)
+            instance = new Web3AuthApi();
+        return instance;
+    }
+
+    public StoreApiResponse? authorizeSession(string key)
+    {
+        using (var client = new HttpClient())
+        {
+            client.BaseAddress = baseAddress;
+            HttpResponseMessage response = client.GetAsync("/store/get?key=" + key).Result;
+
+            if (response.IsSuccessStatusCode)
+            {
+                string result = response.Content.ReadAsStringAsync().Result;
+                return Newtonsoft.Json.JsonConvert.DeserializeObject<StoreApiResponse>(result);
+            }
+            return null;
+        }
+    }
+
+    public JObject logout(LogoutApiRequest logoutApiRequest)
+    {
+        using (var client = new HttpClient())
+        {
+            client.BaseAddress = baseAddress;
+            var content = new StringContent(JsonConvert.SerializeObject(logoutApiRequest), Encoding.UTF8, "application/json");
+            HttpResponseMessage response = client.PostAsync("/store/set", content).Result;
+
+            if (response.IsSuccessStatusCode)
+            {
+                string result = response.Content.ReadAsStringAsync().Result;
+                return Newtonsoft.Json.JsonConvert.DeserializeObject<JObject>(result);
+            }
+            return null;
+        }
+    }
+}

Assets/Plugins/Web3AuthSDK/Keystore/KeyStoreManagerUtils.cs

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+using Nethereum.Hex.HexConvertors.Extensions;
+using Nethereum.Signer;
+using Nethereum.Util;
+using Org.BouncyCastle.Asn1;
+
+public class KeyStoreManagerUtils
+{
+
+    public static string SESSION_ID = "sessionId";
+    public static string IV_KEY = "ivKey";
+    public static string EPHEM_PUBLIC_Key = "ephemPublicKey";
+    public static string MAC = "mac";
+
+    public static string getPubKey(string sessionId)
+    {
+        var privKey = new EthECKey(sessionId);
+        return privKey.GetPubKey().ToHex();
+    }
+
+    static KeyStoreManagerUtils()
+    {
+        SecurePlayerPrefs.Init();
+    }
+
+    public static void savePreferenceData(string key, string value)
+    {
+        SecurePlayerPrefs.SetString(key, value);
+    }
+
+    public static string getPreferencesData(string key)
+    {
+        return SecurePlayerPrefs.GetString(key);
+    }
+    public static void deletePreferencesData(string key)
+    {
+        SecurePlayerPrefs.DeleteKey(key);
+    }
+
+    public static string getECDSASignature(string privateKey, string data){
+        var derivedECKeyPair = new EthECKey(privateKey);
+        byte[] hashedData = new Sha3Keccack().CalculateHash(System.Text.Encoding.UTF8.GetBytes(data));
+
+        var signature = derivedECKeyPair.Sign(hashedData);
+        var v = new Asn1EncodableVector();
+        v.Add(new DerInteger(signature.R));
+        v.Add(new DerInteger(signature.S));
+
+        var der = new DerSequence(v);
+        var sigBytes = der.GetEncoded();
+        return sigBytes.ToHexCompact();
+    }
+}