up the blokcing tasks

src/__Libraries/StellaOps.Cryptography.Plugin.SimRemote/SimRemoteSigner.cs

@@ -0,0 +1,33 @@
+using StellaOps.Cryptography;
+
+namespace StellaOps.Cryptography.Plugin.SimRemote;
+
+internal sealed class SimRemoteSigner : ICryptoSigner
+{
+    private readonly SimRemoteHttpClient client;
+
+    public SimRemoteSigner(SimRemoteHttpClient client, string algorithmId, string keyId)
+    {
+        this.client = client ?? throw new ArgumentNullException(nameof(client));
+        AlgorithmId = algorithmId ?? throw new ArgumentNullException(nameof(algorithmId));
+        KeyId = keyId ?? throw new ArgumentNullException(nameof(keyId));
+    }
+
+    public string KeyId { get; }
+    public string AlgorithmId { get; }
+
+    public async ValueTask<byte[]> SignAsync(ReadOnlyMemory<byte> data, CancellationToken cancellationToken = default)
+    {
+        var sig = await client.SignAsync(AlgorithmId, data.ToArray(), cancellationToken).ConfigureAwait(false);
+        return Convert.FromBase64String(sig);
+    }
+
+    public async ValueTask<bool> VerifyAsync(ReadOnlyMemory<byte> data, ReadOnlyMemory<byte> signature, CancellationToken cancellationToken = default)
+    {
+        var sigBase64 = Convert.ToBase64String(signature.ToArray());
+        return await client.VerifyAsync(AlgorithmId, data.ToArray(), sigBase64, cancellationToken).ConfigureAwait(false);
+    }
+
+    public Microsoft.IdentityModel.Tokens.JsonWebKey ExportPublicJsonWebKey()
+        => new() { Kid = KeyId, Alg = AlgorithmId, Kty = "oct" };
+}