Enable converting between public keys, script hashes and address

src/neo/SmartContract/InteropService.Contract.cs

@@ -19,7 +19,12 @@ public static class Contract
             public static readonly InteropDescriptor Call = Register("System.Contract.Call", Contract_Call, 0_01000000, TriggerType.System | TriggerType.Application, CallFlags.AllowCall);
             public static readonly InteropDescriptor CallEx = Register("System.Contract.CallEx", Contract_CallEx, 0_01000000, TriggerType.System | TriggerType.Application, CallFlags.AllowCall);
             public static readonly InteropDescriptor IsStandard = Register("System.Contract.IsStandard", Contract_IsStandard, 0_00030000, TriggerType.All, CallFlags.None);
-
+
+            /// <summary>
+            /// Calculate corresponding account scripthash for given public key
+            /// </summary>
+            public static readonly InteropDescriptor CreateStandardAccount = Register("System.Contract.CreateStandardAccount", Contract_CreateStandardAccount, 0_00010000, TriggerType.All, CallFlags.None);
+
             private static long GetDeploymentPrice(EvaluationStack stack, StoreView snapshot)
             {
                 int size = stack.Peek(0).GetByteLength() + stack.Peek(1).GetByteLength();
@@ -166,6 +171,14 @@ private static bool Contract_IsStandard(ApplicationEngine engine)
                 engine.CurrentContext.EvaluationStack.Push(isStandard);
                 return true;
             }
+
+            private static bool Contract_CreateStandardAccount(ApplicationEngine engine)
+            {
+                ReadOnlySpan<byte> pubKey = engine.CurrentContext.EvaluationStack.Pop().GetSpan();
+                byte[] scriptHash = SmartContract.Contract.CreateSignatureRedeemScript(Cryptography.ECC.ECPoint.FromBytes(pubKey.ToArray(), Cryptography.ECC.ECCurve.Secp256r1)).ToScriptHash().ToArray();
+                engine.CurrentContext.EvaluationStack.Push(scriptHash);
+                return true;
+            }
         }
     }
 }

src/neo/SmartContract/InteropService.Encode.cs

@@ -0,0 +1,28 @@
+using Neo.Cryptography;
+using Neo.IO;
+using Neo.VM;
+using Neo.Wallets;
+using System;
+using System.Linq;
+
+namespace Neo.SmartContract
+{
+    partial class InteropService
+    {
+        public static class Encode
+        {
+            /// <summary>
+            /// Convert public key to corresponding wallet account address
+            /// </summary>
+            public static readonly InteropDescriptor PubKeyToAddress = Register("Neo.Encode.PubKeyToAddress", Encode_PubKeyToAddress, 0_00010000, TriggerType.All, CallFlags.None);
+
+            private static bool Encode_PubKeyToAddress(ApplicationEngine engine)
+            {
+                ReadOnlySpan<byte> pubKey = engine.CurrentContext.EvaluationStack.Pop().GetSpan();
+                string address = SmartContract.Contract.CreateSignatureRedeemScript(Cryptography.ECC.ECPoint.FromBytes(pubKey.ToArray(), Cryptography.ECC.ECCurve.Secp256r1)).ToScriptHash().ToAddress();
+                engine.CurrentContext.EvaluationStack.Push(address);
+                return true;
+            }
+        }
+    }
+}

tests/neo.UnitTests/SmartContract/UT_InteropService.cs

@@ -858,6 +858,26 @@ public void TestContract_Destroy()
             InteropService.Invoke(engine, InteropService.Contract.Destroy).Should().BeTrue();
         }
 
+        [TestMethod]
+        public void TestEncode_PubKeyToAddress()
+        {
+            var engine = GetEngine(true, true);
+            byte[] data = "024b817ef37f2fc3d4a33fe36687e592d9f30fe24b3e28187dc8f12b3b3b2b839e".HexToBytes();
+            engine.CurrentContext.EvaluationStack.Push(data);
+            InteropService.Invoke(engine, InteropService.Encode.PubKeyToAddress).Should().BeTrue();
+            engine.CurrentContext.EvaluationStack.Pop().GetString().Should().BeEquivalentTo("NYXBPFgUM2Wa9wUdtEZV3zk1pLWamNEJB1");
+        }
+
+        [TestMethod]
+        public void TestContract_CreateStandardAccount()
+        {
+            var engine = GetEngine(true, true);
+            byte[] data = "024b817ef37f2fc3d4a33fe36687e592d9f30fe24b3e28187dc8f12b3b3b2b839e".HexToBytes();
+            engine.CurrentContext.EvaluationStack.Push(data);
+            InteropService.Invoke(engine, InteropService.Contract.CreateStandardAccount).Should().BeTrue();
+            engine.CurrentContext.EvaluationStack.Pop().GetSpan().ToArray().Should().BeEquivalentTo(UInt160.Parse("0x2c847208959ec1cc94dd13bfe231fa622a404a8a").ToArray());
+        }
+
         public static void LogEvent(object sender, LogEventArgs args)
         {
             Transaction tx = (Transaction)args.ScriptContainer;