stabilizaiton work - projects rework for maintenanceability and ui livening

src/__Libraries/StellaOps.Cryptography.Plugin.PqSoft/FalconSignerWrapper.cs

@@ -0,0 +1,60 @@
+using Microsoft.IdentityModel.Tokens;
+using Org.BouncyCastle.Pqc.Crypto.Falcon;
+using StellaOps.Cryptography;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace StellaOps.Cryptography.Plugin.PqSoft;
+
+internal sealed class FalconSignerWrapper : ICryptoSigner
+{
+    private readonly string _keyId;
+    private readonly FalconPrivateKeyParameters _privateKey;
+    private readonly FalconPublicKeyParameters _publicKey;
+
+    public FalconSignerWrapper(string keyId, FalconPrivateKeyParameters privateKey, FalconPublicKeyParameters publicKey)
+    {
+        _keyId = keyId;
+        _privateKey = privateKey;
+        _publicKey = publicKey;
+    }
+
+    public string KeyId => _keyId;
+
+    public string AlgorithmId => SignatureAlgorithms.Falcon512;
+
+    public ValueTask<byte[]> SignAsync(ReadOnlyMemory<byte> data, CancellationToken cancellationToken = default)
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        var signer = new FalconSigner();
+        signer.Init(true, _privateKey);
+        return ValueTask.FromResult(signer.GenerateSignature(data.ToArray()));
+    }
+
+    public ValueTask<bool> VerifyAsync(ReadOnlyMemory<byte> data, ReadOnlyMemory<byte> signature, CancellationToken cancellationToken = default)
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        var verifier = new FalconSigner();
+        verifier.Init(false, _publicKey);
+        var ok = verifier.VerifySignature(data.ToArray(), signature.ToArray());
+        return ValueTask.FromResult(ok);
+    }
+
+    public JsonWebKey ExportPublicJsonWebKey()
+    {
+        var jwk = new JsonWebKey
+        {
+            Kid = _keyId,
+            Alg = AlgorithmId,
+            Kty = JsonWebAlgorithmsKeyTypes.Octet,
+            Use = JsonWebKeyUseNames.Sig,
+            Crv = "Falcon512"
+        };
+
+        jwk.KeyOps.Add("sign");
+        jwk.KeyOps.Add("verify");
+        jwk.X = Base64UrlEncoder.Encode(_publicKey.GetEncoded());
+
+        return jwk;
+    }
+}