Add ECRecoverProvider

Stratis.SmartContracts/IEcRecoverProvider.cs

@@ -0,0 +1,7 @@
+namespace Stratis.SmartContracts
+{
+    public interface IEcRecoverProvider
+    {
+        Address GetSigner(byte[] message, byte[] signature);
+    }
+}

Stratis.SmartContracts/ISmartContractState.cs

@@ -11,6 +11,7 @@ public interface ISmartContractState
         IInternalTransactionExecutor InternalTransactionExecutor { get; }
         IInternalHashHelper InternalHashHelper { get; }
         ISerializer Serializer { get; }
+        IEcRecoverProvider EcRecoverProvider { get; }
         Func<ulong> GetBalance { get; }
     }
 }

Stratis.SmartContracts/SmartContract.cs

@@ -95,6 +95,17 @@ protected byte[] Keccak256(byte[] toHash)
             return this.state.InternalHashHelper.Keccak256(toHash);
         }
 
+        /// <summary>
+        /// Recovers the address that signed a message from its message and signature.
+        /// </summary>
+        /// <param name="message">The message that was signed.</param>
+        /// <param name="signature">The signature.</param>
+        /// <returns>The address of the signer.</returns>
+        protected Address EcRecover(byte[] message, byte[] signature)
+        {
+            return this.state.EcRecoverProvider.GetSigner(message, signature);
+        }
+
         /// <summary>
         /// Halts contract execution by throwing an exception if the input condition is not met.
         /// </summary>

Stratis.SmartContracts/Stratis.SmartContracts.csproj

@@ -5,10 +5,11 @@
     <Authors>Stratis Group Ltd.</Authors>
     <Company>Stratis Group Ltd.</Company>
     <Product>Stratis Smart Contracts</Product>
-    <Version>1.2.1</Version>
+    <Version>1.2.2-dev</Version>
     <PackageId>Stratis.SmartContracts</PackageId>
 	<CodeAnalysisRuleSet>..\None.ruleset</CodeAnalysisRuleSet>
-	<AssemblyVersion>1.2.1.0</AssemblyVersion>
+	<AssemblyVersion>1.2.2.0</AssemblyVersion>
+	<GeneratePackageOnBuild>true</GeneratePackageOnBuild>
   </PropertyGroup>
 
 </Project>