37 lines
970 B
Dart
37 lines
970 B
Dart
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import 'dart:convert';
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import 'dart:math';
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import 'package:bip340/bip340.dart' as bip340;
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import 'package:crypto/crypto.dart';
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String signNostrEvent({
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required String privateKey,
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required String publicKey,
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required int kind,
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required List<List<String>> tags,
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required String content,
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int? createdAt,
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}) {
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final ts = createdAt ?? DateTime.now().millisecondsSinceEpoch ~/ 1000;
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final ser = jsonEncode([0, publicKey, ts, kind, tags, content]);
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final idBytes = sha256.convert(utf8.encode(ser)).bytes;
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final id = idBytes.map((b) => b.toRadixString(16).padLeft(2, '0')).join();
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final rng = Random.secure();
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final aux = List.generate(32, (_) => rng.nextInt(256))
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.map((b) => b.toRadixString(16).padLeft(2, '0'))
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.join();
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final sig = bip340.sign(privateKey, id, aux);
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return jsonEncode({
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'id': id,
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'pubkey': publicKey,
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'created_at': ts,
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'kind': kind,
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'tags': tags,
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'content': content,
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'sig': sig,
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});
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}
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