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Nip44Encrypt

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randogoth 2026-07-11 17:33:08 +03:00
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commit 1fee9e5d34
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5
README.md
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@ -64,6 +64,8 @@ final actor = NostrSignerActor(privateKeyHex);
|---|---|---|
| `SignEvent(kind, content, tags?, createdAt?)` | `EventSigned(event)` | Returns a signed event as a JSON string with all seven NIP-01 fields |
| `GetPublicKey()` | `PublicKeyResult(publicKey)` | Returns the hex public key for this signer |
| `Nip44Encrypt(plaintext)` | `Nip44Text(value)` | NIP-44 v2 encrypt-to-self: seals `plaintext` with this signer's own key (base64 payload). Useful for kind-30078 app data. |
| `Nip44Decrypt(payload)` | `Nip44Text(value)` | Inverse of `Nip44Encrypt`. Throws on a version mismatch or HMAC failure. |
`tags` defaults to `[]`. `createdAt` defaults to `DateTime.now()` (Unix seconds).
@ -107,6 +109,9 @@ Implements the same `SignerMessage`/`SignerResult` protocol as `NostrSignerActor
| `GetPublicKey()` | `PublicKeyResult(publicKey)` | Returns the signer's public key (cached after first call) |
| `SignEvent(kind, content, tags?, createdAt?)` | `EventSigned(event)` | Sends a `sign_event` request to the remote signer; returns the fully signed event JSON |
The `Nip44Encrypt`/`Nip44Decrypt` messages are **not** supported by the remote
signer yet — only `GetPublicKey` and `SignEvent` are proxied over NIP-46.
Call `actor.close()` when done to tear down the relay connection.
```dart

27
lib/src/nostr_signer_actor.dart
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@ -1,6 +1,7 @@
import 'package:actors/actors.dart';
import 'package:bip340/bip340.dart' as bip340;
import 'nip44.dart';
import 'nostr_event.dart';
sealed class SignerMessage {
@ -24,6 +25,20 @@ final class GetPublicKey extends SignerMessage {
const GetPublicKey();
}
/// NIP-44 v2 encrypt-to-self: encrypts [plaintext] with this signer's own key
/// (conversation key derived from its private key and public key).
final class Nip44Encrypt extends SignerMessage {
final String plaintext;
const Nip44Encrypt(this.plaintext);
}
/// NIP-44 v2 decrypt-from-self: inverse of [Nip44Encrypt]. Throws on a version
/// mismatch or HMAC failure (e.g. a payload sealed with a different key).
final class Nip44Decrypt extends SignerMessage {
final String payload;
const Nip44Decrypt(this.payload);
}
sealed class SignerResult {
const SignerResult();
}
@ -38,6 +53,12 @@ final class PublicKeyResult extends SignerResult {
const PublicKeyResult(this.publicKey);
}
/// Result of a [Nip44Encrypt] (base64 payload) or [Nip44Decrypt] (plaintext).
final class Nip44Text extends SignerResult {
final String value;
const Nip44Text(this.value);
}
class NostrSignerActor with Handler<SignerMessage, SignerResult> {
final String _privateKey;
final String _publicKey;
@ -51,6 +72,12 @@ class NostrSignerActor with Handler<SignerMessage, SignerResult> {
SignEvent(:final kind, :final tags, :final content, :final createdAt) =>
Future.value(_signEvent(kind, tags, content, createdAt)),
GetPublicKey() => Future.value(PublicKeyResult(_publicKey)),
Nip44Encrypt(:final plaintext) => Future.value(
Nip44Text(nip44Encrypt(plaintext, _privateKey, _publicKey)),
),
Nip44Decrypt(:final payload) => Future.value(
Nip44Text(nip44Decrypt(payload, _privateKey, _publicKey)),
),
};
EventSigned _signEvent(