feat: add key generator

Author: twsc-james

.gitignore

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+.idea/
+bin/
+obj/
+/packages/
+riderModule.iml
+/_ReSharper.Caches/

EccSDK.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "EccSDK", "EccSDK\EccSDK.csproj", "{5EAC669B-2882-4A01-BC96-F39E04092834}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "EccSdkUnitTests", "EccSdkUnitTests\EccSdkUnitTests.csproj", "{CEF5979A-D5C2-47B4-B9EE-80C1F9AF1838}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{5EAC669B-2882-4A01-BC96-F39E04092834}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{5EAC669B-2882-4A01-BC96-F39E04092834}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{5EAC669B-2882-4A01-BC96-F39E04092834}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{5EAC669B-2882-4A01-BC96-F39E04092834}.Release|Any CPU.Build.0 = Release|Any CPU
+		{CEF5979A-D5C2-47B4-B9EE-80C1F9AF1838}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{CEF5979A-D5C2-47B4-B9EE-80C1F9AF1838}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{CEF5979A-D5C2-47B4-B9EE-80C1F9AF1838}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{CEF5979A-D5C2-47B4-B9EE-80C1F9AF1838}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

EccSDK/EccGenerator.cs

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+using EccGrpcSDK.models;
+using Org.BouncyCastle.Crypto;
+using Org.BouncyCastle.Crypto.Generators;
+using Org.BouncyCastle.Crypto.Parameters;
+using Org.BouncyCastle.Security;
+
+namespace EccGrpcSDK;
+
+public class EccGenerator : IEccGenerator
+{
+    public KeyPair GenerateKeyPair(int keySize)
+    {
+        var gen = new ECKeyPairGenerator("ECDSA");
+        gen.Init(new KeyGenerationParameters(new SecureRandom(), keySize));
+
+        var keyGen = gen.GenerateKeyPair();
+
+        var privateKey = (ECPrivateKeyParameters) keyGen.Private;
+        var publicKey = (ECPublicKeyParameters) keyGen.Public;
+
+        return new KeyPair()
+        {
+            PublicKey = publicKey.Q, 
+            PrivateKey = privateKey.D,
+        };
+    }
+}

EccSDK/EccSDK.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net8.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+        <RootNamespace>EccGrpcSDK</RootNamespace>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <PackageReference Include="BouncyCastle.NetCore" Version="2.2.1" />
+    </ItemGroup>
+
+</Project>

EccSDK/IEccGenerator.cs

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+using EccGrpcSDK.models;
+using Org.BouncyCastle.Crypto;
+
+namespace EccGrpcSDK;
+
+public interface IEccGenerator
+{
+    KeyPair GenerateKeyPair(int keySize);
+}

EccSDK/models/KeyPair.cs

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+using Org.BouncyCastle.Math;
+using Org.BouncyCastle.Math.EC;
+
+namespace EccGrpcSDK.models;
+
+public class KeyPair
+{
+    public BigInteger PrivateKey { get; set; }
+    public ECPoint PublicKey { get; set; }
+}