feat(api): add account workspaces and signed content events

server/tests/WebDrop.Core.Tests/VectorTests.cs

@@ -67,6 +67,37 @@ public class VectorTests
             Assert.Equal(H(item.GetProperty("k_item")), ItemKey(H(item.GetProperty("item_id"))));
     }
 
+    [Fact]
+    public void SignatureFramingAndEcdsaMatchTheVectors()
+    {
+        var vector = V.GetProperty("signatures");
+        static byte[] B64Url(string value) => Convert.FromBase64String(value.Replace('-', '+').Replace('_', '/') + new string('=', (4 - value.Length % 4) % 4));
+        var x = B64Url(vector.GetProperty("x").GetString()!);
+        var y = B64Url(vector.GetProperty("y").GetString()!);
+        var payload = H(vector.GetProperty("payload"));
+        var kind = vector.GetProperty("kind").GetString()!;
+        var signature = H(vector.GetProperty("signature"));
+        Assert.Equal(H(vector.GetProperty("message")), SignatureCodec.BuildMessage(kind, payload));
+        Assert.True(SignatureCodec.VerifyP256(x, y, kind, payload, signature));
+        Assert.False(SignatureCodec.VerifyP256(x, y, "chat.edit", payload, signature));
+        payload[0] ^= 1;
+        Assert.False(SignatureCodec.VerifyP256(x, y, kind, payload, signature));
+    }
+
+    [Fact]
+    public void ContentEventPayloadAndFrameManifestMatchTheVectors()
+    {
+        var vector = V.GetProperty("content_event");
+        var digests = vector.GetProperty("frame_digests").EnumerateArray().Select(H).ToList();
+        var manifest = SignatureCodec.FrameManifestHash(digests);
+        Assert.Equal(H(vector.GetProperty("manifest_hash")), manifest);
+        byte[] id(string property) => H(vector.GetProperty(property));
+        Assert.Equal(H(vector.GetProperty("payload")), SignatureCodec.ContentEventPayload(
+            id("space_id"), vector.GetProperty("channel_id").GetString()!, vector.GetProperty("username").GetString()!,
+            vector.GetProperty("device_id").GetString()!, id("event_id"), vector.GetProperty("kind").GetString()!, CryptoDomain.Chat,
+            vector.GetProperty("epoch").GetInt32(), id("item_id"), vector.GetProperty("frame_count").GetInt32(), manifest, id("target_item_id")));
+    }
+
     [Fact]
     public void ServerTokenHashMatchesTheStoredHashes()
     {