Add crypto and digital signature functionality for Blazor and light WebCrypto interop.

• Namespace PkcsExtensions.Blazor:
  • IWebCryptoProvider - provide generate random numbers, generate RSA and ECDSA (as JsonWebKey) key pairs
  • IEcWebCryptoProvider - provide methods GetSharedDhmSecret for derive bytes using Diffie Hellman Merkle and GetSharedEphemeralDhmSecret for ECIES scheme.
• Namespace PkcsExtensions.Blazor.Jwk - implementation of JsonWebKey
• Namespace PkcsExtensions.Blazor.Security - extensions for System.Security.Cryptography

Install package dotnet add package PkcsExtensions.Blazor to Blazor WebAssebmly project.

Add to index.html:

<script src="_content/PkcsExtensions.Blazor/WebCryptoInterop.js"></script>

or minifiy version:

<script src="_content/PkcsExtensions.Blazor/WebCryptoInterop.min.js"></script>

And register services in Main method:

    public class Program
    {
        public static async Task Main(string[] args)
        {
            var builder = WebAssemblyHostBuilder.CreateDefault(args);
            builder.RootComponents.Add<App>("app");
            builder.Services.AddSingleton(new HttpClient { BaseAddress = new Uri(builder.HostEnvironment.BaseAddress) });
            
            builder.Services.AddWebCryptoProvider();

            WebAssemblyHost host = builder.Build();
            await host.RunAsync();
        }
    }

See other examples.

• Avoid use WebCyrpto for hashing, HMAC-ing, encryption, because their implementations has differs between browsers and operating systems. Use .Net implementation.
• Avoid use WebCrypto for digital signing because it does not support hash signing.
• Hint: Consider using high performance elliptic curves Curve25519, Ed25519 or similar. Use full managed implementation e.g. Chaos.NaCl library.

1. PkcsExtensions
2. WebCrypto support in browsers