Merge pull request #14 from musab1234/master

SDK Updates - Session Management & dAppShare

Author: chaitanyapotti

Assets/Plugins/Web3AuthSDK/Editor/BuildPostProcess.cs

@@ -39,8 +39,6 @@ public static void OnPostprocessBuild(BuildTarget target, string pathToBuiltProj
         urlSchemes.AddString(uri.Scheme);
 
         infoPlist.WriteToFile(infoPlistPath);
-        
-
 #endif
     }
 }

Assets/Plugins/Web3AuthSDK/Keystore/KeyStoreManagerUtils.cs

@@ -1,10 +1,24 @@
-using Nethereum.Hex.HexConvertors.Extensions;
-using Nethereum.Signer;
-using Nethereum.Util;
 using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Asn1.Sec;
+using Org.BouncyCastle.Crypto.Digests;
+using Org.BouncyCastle.Crypto.Parameters;
+using Org.BouncyCastle.Crypto.Signers;
+using Org.BouncyCastle.Math;
+using Org.BouncyCastle.Utilities.Encoders;
+using System.Runtime.InteropServices;
 
 public class KeyStoreManagerUtils
 {
+#if UNITY_IOS
+    [DllImport("__Internal")]
+    extern static int web3auth_keystore_set(string key, string value);
+
+    [DllImport("__Internal")]
+    extern static string web3auth_keystore_get(string key);
+
+    [DllImport("__Internal")]
+    extern static int web3auth_keystore_delete(string key);
+#endif
 
     public static string SESSION_ID = "sessionId";
     public static string IV_KEY = "ivKey";
@@ -13,40 +27,78 @@ public class KeyStoreManagerUtils
 
     public static string getPubKey(string sessionId)
     {
-        var privKey = new EthECKey(sessionId);
-        return privKey.GetPubKey().ToHex();
+        var domain = SecNamedCurves.GetByName("secp256k1");
+        var parameters = new ECDomainParameters(domain.Curve, domain.G, domain.H);
+
+        var key = new ECPrivateKeyParameters(new BigInteger(sessionId, 16), parameters);
+        var q = new ECPublicKeyParameters("EC", domain.G.Multiply(key.D), parameters).Q;
+
+        return Hex.ToHexString(domain.Curve.CreatePoint(q.XCoord.ToBigInteger(), q.YCoord.ToBigInteger()).GetEncoded(false));
     }
 
     static KeyStoreManagerUtils()
     {
+#if !UNITY_IOS
         SecurePlayerPrefs.Init();
+#endif
     }
 
     public static void savePreferenceData(string key, string value)
     {
+#if UNITY_IOS
+        web3auth_keystore_set(key, value);
+#else
         SecurePlayerPrefs.SetString(key, value);
+#endif
     }
 
     public static string getPreferencesData(string key)
     {
+#if UNITY_IOS
+        return web3auth_keystore_get(key);
+#else
         return SecurePlayerPrefs.GetString(key);
+#endif
     }
     public static void deletePreferencesData(string key)
     {
+#if UNITY_IOS
+        web3auth_keystore_delete(key);
+#else
         SecurePlayerPrefs.DeleteKey(key);
+#endif
     }
 
     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 curve = SecNamedCurves.GetByName("secp256k1");
+        var domain = new ECDomainParameters(curve.Curve, curve.G, curve.N, curve.H);
+        var keyParameters = new ECPrivateKeyParameters(new BigInteger(privateKey, 16), domain);
+
+        var signer = new ECDsaSigner(new HMacDsaKCalculator(new Sha256Digest()));
+        signer.Init(true, keyParameters);
+
+        var hashAlgorithm = new KeccakDigest(256);
+        byte[] input = System.Text.Encoding.UTF8.GetBytes(data);
+        hashAlgorithm.BlockUpdate(input, 0, input.Length);
+
+        byte[] messageHash = new byte[32];
+        hashAlgorithm.DoFinal(messageHash, 0);
+
+        var signature = signer.GenerateSignature(messageHash);
+
+        var r = signature[0];
+        var s = signature[1];
+
+        var other = curve.Curve.Order.Subtract(s);
+        if (s.CompareTo(other) == 1)
+            s = other;
 
-        var signature = derivedECKeyPair.Sign(hashedData);
         var v = new Asn1EncodableVector();
-        v.Add(new DerInteger(signature.R));
-        v.Add(new DerInteger(signature.S));
+        v.Add(new DerInteger(r));
+        v.Add(new DerInteger(s));
+
+        var derSignature = new DerSequence(v).GetDerEncoded();
 
-        var der = new DerSequence(v);
-        var sigBytes = der.GetEncoded();
-        return sigBytes.ToHexCompact();
+        return Hex.ToHexString(derSignature);
     }
 }