SecretSharingDotNet 0.12.0

dotnet add package SecretSharingDotNet --version 0.12.0                
NuGet\Install-Package SecretSharingDotNet -Version 0.12.0                
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="SecretSharingDotNet" Version="0.12.0" />                
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add SecretSharingDotNet --version 0.12.0                
#r "nuget: SecretSharingDotNet, 0.12.0"                
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install SecretSharingDotNet as a Cake Addin
#addin nuget:?package=SecretSharingDotNet&version=0.12.0

// Install SecretSharingDotNet as a Cake Tool
#tool nuget:?package=SecretSharingDotNet&version=0.12.0                

Setup

Install SecretSharingDotNet package

  1. Open a console and switch to the directory, containing your project file.

  2. Use the following command to install version 0.12.0 of the SecretSharingDotNet package:

    dotnet add package SecretSharingDotNet -v 0.12.0 -f <FRAMEWORK>
    
  3. After the completion of the command, look at the project file to make sure that the package is successfully installed.

    You can open the .csproj file to see the added package reference:

    <ItemGroup>
      <PackageReference Include="SecretSharingDotNet" Version="0.12.0" />
    </ItemGroup>
    

Remove SecretSharingDotNet package

  1. Open a console and switch to the directory, containing your project file.

  2. Use the following command to remove the SecretSharingDotNet package:

    dotnet remove package SecretSharingDotNet
    
  3. After the completion of the command, look at the project file to make sure that the package is successfully removed.

    You can open the .csproj file to check the deleted package reference.

Usage

Basics

Use the function MakeShares to generate the shares, based on a random or pre-defined secret. Afterwards, use the function Reconstruction to re-construct the original secret.

The length of the shares is based on the security level. It is possible to pre-define a security level by ctor or the SecurityLevel property. The pre-defined security level will be overriden, if the secret size is greater than the Mersenne prime, which is calculated by means of the security level. It is not necessary to define a security level for a re-construction.

Using the SecretSharingDotNet library with DI in a .NET project.

This guide will demonstrate how to use the SecretSharingDotNet library with Dependency Injection (DI) in a .NET project.

Firstly, add the following dependencies:

using Microsoft.Extensions.DependencyInjection;
using SecretSharingDotNet.Cryptography;
using SecretSharingDotNet.Math;
using System.Numerics;

Next, initialize a ServiceCollection instance and add dependencies to the DI container:

var serviceCollection = new ServiceCollection();
serviceCollection.AddSingleton<IExtendedGcdAlgorithm<BigInteger>,  ExtendedEuclideanAlgorithm<BigInteger>>();
serviceCollection.AddSingleton<IMakeSharesUseCase<BigInteger>, ShamirsSecretSharing<BigInteger>>();
serviceCollection.AddSingleton<IReconstructionUseCase<BigInteger>, ShamirsSecretSharing<BigInteger>>();
using var serviceProvider = serviceCollection.BuildServiceProvider();

In the code above, the ServiceCollection registers an implementation for each of the main components of the SecretSharingDotNet library.

Next, create an instance of the IMakeSharesUseCase<BigInteger>:

var makeSharesUseCase = serviceProvider.GetRequiredService<IMakeSharesUseCase<BigInteger>>();

Using this instance, it is possible to create shares from a secret:

var shares = makeSharesUseCase.MakeShares(3, 7, "Hello!");
Console.WriteLine(shares);

Similarly, an instance of IReconstructionUseCase<BigInteger> can be created to rebuild the original secret:

var reconstructionUseCase = serviceProvider.GetRequiredService<IReconstructionUseCase<BigInteger>>();
var reconstruction = reconstructionUseCase.Reconstruction(shares.Where(p => p.X.IsEven).ToArray());
Console.WriteLine(reconstruction);

The code above reconstructs the original secret from the shares, and then outputs it.

Random secret

Create a random secret in conjunction with the generation of shares. The length of the generated shares and of the secret are based on the security level. Here is an example with a pre-defined security level of 127:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Numerics;

using SecretSharingDotNet.Cryptography;
using SecretSharingDotNet.Math;

namespace Example1
{
  public class Program
  {
    public static void Main(string[] args)
    {
      var gcd = new ExtendedEuclideanAlgorithm<BigInteger>();

      //// Create Shamir's Secret Sharing instance with BigInteger
      var split = new ShamirsSecretSharing<BigInteger>(gcd);

      //// Minimum number of shared secrets for reconstruction: 3
      //// Maximum number of shared secrets: 7
      //// Security level: 127 (Mersenne prime exponent)
      var shares = split.MakeShares(3, 7, 127);

      //// The property 'shares.OriginalSecret' represents the random secret
      var secret = shares.OriginalSecret;

      //// Secret as big integer number
      Console.WriteLine((BigInteger)secret);

      //// Secret as base64 string
      Console.WriteLine(secret.ToBase64());

      //// The 'shares' instance contains the shared secrets
      var combine = new ShamirsSecretSharing<BigInteger>(gcd);
      var subSet1 = shares.Where(p => p.X.IsEven).ToList();
      var recoveredSecret1 = combine.Reconstruction(subSet1.ToArray());
      var subSet2 = shares.Where(p => !p.X.IsEven).ToList();
      var recoveredSecret2 = combine.Reconstruction(subSet2.ToArray());

      //// String representation of all shares
      Console.WriteLine(shares);

      //// 1st recovered secret as big integer number
      Console.WriteLine((BigInteger)recoveredSecret1);

      //// 2nd recovered secret as big integer number
      Console.WriteLine((BigInteger)recoveredSecret2);

      //// 1st recovered secret as base64 string
      Console.WriteLine(recoveredSecret1.ToBase64());

      //// 2nd recovered secret as base64 string
      Console.WriteLine(recoveredSecret2.ToBase64());
    }
  }
}

Pre-defined secret: text

Use a text as secret, which can be divided into shares. The length of the generated shares is based on the security level. Here is an example with auto-detected security level:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Numerics;

using SecretSharingDotNet.Cryptography;
using SecretSharingDotNet.Math;

namespace Example2
{
  public class Program
  {
    public static void Main(string[] args)
    {
      var gcd = new ExtendedEuclideanAlgorithm<BigInteger>();

      //// Create Shamir's Secret Sharing instance with BigInteger
      var split = new ShamirsSecretSharing<BigInteger>(gcd);

      string password = "Hello World!!";
      //// Minimum number of shared secrets for reconstruction: 3
      //// Maximum number of shared secrets: 7
      //// Attention: The password length can change the security level set by the ctor
      //// or SecurityLevel property.
      var shares = split.MakeShares(3, 7, password);

      //// The property 'shares.OriginalSecret' represents the original password
      var secret = shares.OriginalSecret;

      //// The 'shares' instance contains the shared secrets
      var combine = new ShamirsSecretSharing<BigInteger>(gcd);
      var subSet1 = shares.Where(p => p.X.IsEven).ToList();
      var recoveredSecret1 = combine.Reconstruction(subSet1.ToArray());
      var subSet2 = shares.Where(p => !p.X.IsEven).ToList();
      var recoveredSecret2 = combine.Reconstruction(subSet2.ToArray());

      //// String representation of all shares
      Console.WriteLine(shares);

      //// 1st recovered secret as string (not base64!)
      Console.WriteLine(recoveredSecret1);

      //// 2nd recovered secret as string (not base64!)
      Console.WriteLine(recoveredSecret2);
    }
  }
}

Pre-defined secret: number

Use an integer number as secret, which can be divided into shares. The length of the generated shares is based on the security level. Here is an example with a pre-defined security level of 521:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Numerics;

using SecretSharingDotNet.Cryptography;
using SecretSharingDotNet.Math;

namespace Example3
{
  public class Program
  {
    public static void Main(string[] args)
    {
      var gcd = new ExtendedEuclideanAlgorithm<BigInteger>();

      //// Create Shamir's Secret Sharing instance with BigInteger
      //// and 
      var split = new ShamirsSecretSharing<BigInteger>(gcd);

      BigInteger number = 20000;
      //// Minimum number of shared secrets for reconstruction: 3
      //// Maximum number of shared secrets: 7
      //// Security level: 521 (Mersenne prime exponent)
      //// Attention: The size of the number can change the security level set by the ctor
      //// or SecurityLevel property.
      var shares = split.MakeShares (3, 7, number, 521);

      //// The property 'shares.OriginalSecret' represents the number (original secret)
      var secret = shares.OriginalSecret;

      ////  The 'shares' instance contains the shared secrets
      var combine = new ShamirsSecretSharing<BigInteger>(gcd);
      var subSet1 = shares.Where(p => p.X.IsEven).ToList();
      var recoveredSecret1 = combine.Reconstruction(subSet1.ToArray());
      var subSet2 = shares.Where(p => !p.X.IsEven).ToList();
      var recoveredSecret2 = combine.Reconstruction(subSet2.ToArray());

      //// String representation of all shares
      Console.WriteLine(shares);

      //// 1st recovered secret as big integer number
      Console.WriteLine((BigInteger)recoveredSecret1);

      //// 2nd recovered secret as big integer number
      Console.WriteLine((BigInteger)recoveredSecret2);
    }
  }
}

Pre-defined secret: byte array

Use a byte array as secret, which can be divided into shares. The length of the generated shares is based on the security level. Here is an example with auto-detected security level:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Numerics;

using SecretSharingDotNet.Cryptography;
using SecretSharingDotNet.Math;

namespace Example4
{
  public class Program
  {
    public static void Main(string[] args)
    {
      var gcd = new ExtendedEuclideanAlgorithm<BigInteger>();

      //// Create Shamir's Secret Sharing instance with BigInteger
      var split = new ShamirsSecretSharing<BigInteger>(gcd);

      byte[] bytes = { 0x1D, 0x2E, 0x3F };
      //// Minimum number of shared secrets for reconstruction: 4
      //// Maximum number of shared secrets: 10
      //// Attention: The password length changes the security level set by the ctor
      var shares = split.MakeShares(4, 10, bytes);

      //// The 'shares' instance contains the shared secrets
      var combine = new ShamirsSecretSharing<BigInteger>(gcd);
      var subSet = shares.Where(p => p.X.IsEven).ToList();
      var recoveredSecret = combine.Reconstruction(subSet.ToArray()).ToByteArray();

      //// String representation of all shares
      Console.WriteLine(shares);

      //// The secret bytes.
      Console.WriteLine($"{recoveredSecret[0]:X2}, {recoveredSecret[1]:X2}, {recoveredSecret[2]:X2}");
    }
  }
}

Shares

The following example shows three ways to use shares to reconstruct a secret:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Numerics;

using SecretSharingDotNet.Cryptography;
using SecretSharingDotNet.Math;

namespace Example5
{
  public class Program
  {
    public static void Main(string[] args)
    {
      var gcd = new ExtendedEuclideanAlgorithm<BigInteger>();

      //// One way to use shares
      string shares1 = "02-665C74ED38FDFF095B2FC9319A272A75" + Environment.NewLine +
                       "05-CDECB88126DBC04D753E0C2D83D7B55D" + Environment.NewLine +
                       "07-54A83E34AB0310A7F5D80F2A68FD4F33";

      //// A 2nd way to use shares
      string[] shares2 = {"02-665C74ED38FDFF095B2FC9319A272A75",
                          "07-54A83E34AB0310A7F5D80F2A68FD4F33",
                          "05-CDECB88126DBC04D753E0C2D83D7B55D"};

      //// Another way to use shares
      var fp1 = new FinitePoint<BigInteger>("05-CDECB88126DBC04D753E0C2D83D7B55D");
      var fp2 = new FinitePoint<BigInteger>("07-54A83E34AB0310A7F5D80F2A68FD4F33");
      var fp3 = new FinitePoint<BigInteger>("02-665C74ED38FDFF095B2FC9319A272A75");

      var combine = new ShamirsSecretSharing<BigInteger>(gcd);
 
      var recoveredSecret1 = combine.Reconstruction(shares1);
      //// Output should be 52199147989510990914370102003412153
      Console.WriteLine((BigInteger)recoveredSecret1);

      var recoveredSecret2 = combine.Reconstruction(shares2);
      //// Output should be 52199147989510990914370102003412153
      Console.WriteLine((BigInteger)recoveredSecret2);

      //// Output should be 52199147989510990914370102003412153
      var recoveredSecret3 = combine.Reconstruction(fp1, fp2, fp3);
      Console.WriteLine((BigInteger)recoveredSecret3);
    }
  }
}
Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 was computed.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 is compatible.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed.  net9.0 is compatible. 
.NET Core netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.0 is compatible.  netstandard2.1 is compatible. 
.NET Framework net461 was computed.  net462 is compatible.  net463 was computed.  net47 is compatible.  net471 is compatible.  net472 is compatible.  net48 is compatible.  net481 is compatible. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen40 was computed.  tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.
  • .NETFramework 4.6.2

    • No dependencies.
  • .NETFramework 4.7

    • No dependencies.
  • .NETFramework 4.7.1

    • No dependencies.
  • .NETFramework 4.7.2

    • No dependencies.
  • .NETFramework 4.8

    • No dependencies.
  • .NETFramework 4.8.1

    • No dependencies.
  • .NETStandard 2.0

    • No dependencies.
  • .NETStandard 2.1

    • No dependencies.
  • net8.0

    • No dependencies.
  • net9.0

    • No dependencies.

NuGet packages (1)

Showing the top 1 NuGet packages that depend on SecretSharingDotNet:

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Leosac.KeyManager.Library.KeyGen

Key Generation Library for Leosac Key Manager development

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Version Downloads Last updated
0.12.0 79 11/17/2024
0.11.0 9,941 12/30/2023
0.10.2 1,811 9/16/2023
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0.10.0 9,233 12/24/2022
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