2 files changed, 105 insertions, 1 deletions
diff --git a/wrappers/dotnet/VNLib.Utils.Cryptography.Noscrypt/src/internal/FunctionTable.cs b/wrappers/dotnet/VNLib.Utils.Cryptography.Noscrypt/src/internal/FunctionTable.cs
index 0cda5e2..269ae4d 100644
--- a/wrappers/dotnet/VNLib.Utils.Cryptography.Noscrypt/src/internal/FunctionTable.cs
+++ b/wrappers/dotnet/VNLib.Utils.Cryptography.Noscrypt/src/internal/FunctionTable.cs
@@ -119,7 +119,7 @@ namespace VNLib.Utils.Cryptography.Noscrypt.@internal
         internal delegate NCResult NCSignDataDelegate(IntPtr ctx, NCSecretKey* sk, byte* random32, byte* data, uint dataSize, byte* sig64);
 
         [SafeMethodName("NCVerifyData")]
-        internal delegate NCResult NCVerifyDataDelegate(IntPtr ctx, NCPublicKey* sk, byte* data, uint dataSize, byte* sig64);
+        internal delegate NCResult NCVerifyDataDelegate(IntPtr ctx, NCPublicKey* pk, byte* data, uint dataSize, byte* sig64);
 
         [SafeMethodName("NCGetConversationKey")]
         internal delegate NCResult NCGetConversationKeyDelegate(IntPtr ctx, NCSecretKey* sk, NCPublicKey* pk, byte* keyOut32);
diff --git a/wrappers/dotnet/VNLib.Utils.Cryptography.Noscrypt/src/internal/NCUtil.cs b/wrappers/dotnet/VNLib.Utils.Cryptography.Noscrypt/src/internal/NCUtil.cs
new file mode 100644
index 0000000..16f46c6
--- /dev/null
+++ b/wrappers/dotnet/VNLib.Utils.Cryptography.Noscrypt/src/internal/NCUtil.cs
@@ -0,0 +1,104 @@
+// Copyright (C) 2024 Vaughn Nugent
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as
+// published by the Free Software Foundation, either version 3 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+using System;
+using System.Reflection;
+using static VNLib.Utils.Cryptography.Noscrypt.NoscryptLibrary;
+
+using NCResult = System.Int64;
+
+namespace VNLib.Utils.Cryptography.Noscrypt.@internal
+{
+
+    public static class NCUtil
+    {
+
+
+        internal static void CheckResult<T>(NCResult result, bool raiseOnFailure) where T : Delegate
+        {
+            //Only negative values are errors
+            if (result >= NC_SUCCESS)
+            {
+                return;
+            }
+
+            NCResult asPositive = -result;
+
+            // Error code are only 8 bits, if an argument error occured, the
+            // argument number will be in the next upper 8 bits
+            NCErrorCodes errorCode = (NCErrorCodes)(asPositive & 0xFF);
+            byte argNumber = (byte)(asPositive >> 8 & 0xFF);
+
+            switch (errorCode)
+            {
+                case NCErrorCodes.E_NULL_PTR:
+                    RaiseNullArgExceptionForArgumentNumber<T>(argNumber);
+                    break;
+                case NCErrorCodes.E_INVALID_ARG:
+                    RaiseArgExceptionForArgumentNumber<T>(argNumber);
+                    break;
+                case NCErrorCodes.E_ARGUMENT_OUT_OF_RANGE:
+                    RaiseOORExceptionForArgumentNumber<T>(argNumber);
+                    break;
+                case NCErrorCodes.E_INVALID_CTX:
+                    throw new InvalidOperationException("The library context object is null or invalid");
+                case NCErrorCodes.E_OPERATION_FAILED:
+                    RaiseOperationFailedException(raiseOnFailure);
+                    break;
+                case NCErrorCodes.E_VERSION_NOT_SUPPORTED:
+                    throw new NotSupportedException("The requested version is not supported");
+
+                default:
+                    if (raiseOnFailure)
+                    {
+                        throw new InvalidOperationException($"The operation failed with error, code: {errorCode} for arugment {argNumber:x}");
+                    }
+                    break;
+            }
+        }
+
+        private static void RaiseOperationFailedException(bool raise)
+        {
+            if (raise)
+            {
+                throw new InvalidOperationException("The operation failed for an unknown reason");
+            }
+        }
+
+        private static void RaiseNullArgExceptionForArgumentNumber<T>(int argNumber) where T : Delegate
+        {
+            //Get delegate parameters
+            Type type = typeof(T);
+            ParameterInfo arg = type.GetMethod("Invoke")!.GetParameters()[argNumber];
+            throw new ArgumentNullException(arg.Name, "Argument is null or invalid cannot continue");
+        }
+
+        private static void RaiseArgExceptionForArgumentNumber<T>(int argNumber) where T : Delegate
+        {
+            //Get delegate parameters
+            Type type = typeof(T);
+            ParameterInfo arg = type.GetMethod("Invoke")!.GetParameters()[argNumber];
+            throw new ArgumentException("Argument is null or invalid cannot continue", arg.Name);
+        }
+
+        private static void RaiseOORExceptionForArgumentNumber<T>(int argNumber) where T : Delegate
+        {
+            //Get delegate parameters
+            Type type = typeof(T);
+            ParameterInfo arg = type.GetMethod("Invoke")!.GetParameters()[argNumber];
+            throw new ArgumentOutOfRangeException(arg.Name, "Argument is out of range of acceptable values");
+        }
+    }
+}