feat(coldcard): add NFC import and signing for Coldcard Q and Mk4 #2224
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| import 'dart:convert' show base64, utf8; | ||
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| import 'package:convert/convert.dart'; | ||
| import 'package:crypto/crypto.dart'; | ||
| import 'package:ndef/ndef.dart' as ndef; | ||
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| const _bitcoinNfcTypePrefix = 'urn:nfc:ext:'; | ||
| const _bitcoinPsbtType = 'bitcoin.org:psbt'; | ||
| const _bitcoinTxnType = 'bitcoin.org:txn'; | ||
| const _bitcoinSha256Type = 'bitcoin.org:sha256'; | ||
| const _jsonMimeType = 'application/json'; | ||
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| String? payloadFromNdefRecords(List<ndef.NDEFRecord> records) { | ||
| if (records.isEmpty) return null; | ||
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| final bitcoinPayload = _payloadFromBitcoinExternalRecords(records); | ||
| if (bitcoinPayload != null || _hasBitcoinPayloadRecord(records)) { | ||
| return bitcoinPayload; | ||
| } | ||
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| return _payloadFromRecord(records.last); | ||
| } | ||
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| String? _payloadFromBitcoinExternalRecords(List<ndef.NDEFRecord> records) { | ||
| final txnPayload = _externalPayloadForType(records, _bitcoinTxnType); | ||
| if (txnPayload != null) { | ||
| if (!_matchesSha256Checksum(records, txnPayload)) return null; | ||
| return hex.encode(txnPayload); | ||
| } | ||
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| final psbtPayload = _externalPayloadForType(records, _bitcoinPsbtType); | ||
| if (psbtPayload != null) { | ||
| if (!_matchesSha256Checksum(records, psbtPayload)) return null; | ||
| return base64.encode(psbtPayload); | ||
| } | ||
|
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| return null; | ||
| } | ||
|
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| bool _hasBitcoinPayloadRecord(List<ndef.NDEFRecord> records) { | ||
| return _hasExternalRecordForType(records, _bitcoinTxnType) || | ||
| _hasExternalRecordForType(records, _bitcoinPsbtType); | ||
| } | ||
|
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| String? _payloadFromRecord(ndef.NDEFRecord record) { | ||
| if (record is ndef.TextRecord) { | ||
| final text = record.text; | ||
| return text == null || text.isEmpty ? null : text; | ||
| } | ||
|
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| if (record is ndef.ExternalRecord) { | ||
| final payload = record.payload; | ||
| if (payload == null || payload.isEmpty) return null; | ||
| return hex.encode(payload); | ||
| } | ||
|
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| if (record is ndef.MimeRecord && record.decodedType == _jsonMimeType) { | ||
| final payload = record.payload; | ||
| if (payload == null || payload.isEmpty) return null; | ||
|
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| try { | ||
| return utf8.decode(payload); | ||
| } on FormatException { | ||
| return null; | ||
| } | ||
| } | ||
|
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| return null; | ||
| } | ||
|
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| List<int>? _externalPayloadForType(List<ndef.NDEFRecord> records, String type) { | ||
| for (final record in records.whereType<ndef.ExternalRecord>()) { | ||
| if (_normalizedExternalType(record) != type) continue; | ||
|
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| final payload = record.payload; | ||
| if (payload == null || payload.isEmpty) return null; | ||
| return payload; | ||
| } | ||
|
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| return null; | ||
| } | ||
|
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| bool _hasExternalRecordForType(List<ndef.NDEFRecord> records, String type) { | ||
| return records.whereType<ndef.ExternalRecord>().any( | ||
| (record) => _normalizedExternalType(record) == type, | ||
| ); | ||
| } | ||
|
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| String? _normalizedExternalType(ndef.ExternalRecord record) { | ||
| final decodedType = record.decodedType; | ||
| if (decodedType == null || decodedType.isEmpty) return null; | ||
|
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| if (decodedType.startsWith(_bitcoinNfcTypePrefix)) { | ||
| return decodedType.substring(_bitcoinNfcTypePrefix.length); | ||
| } | ||
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| return decodedType; | ||
| } | ||
|
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| bool _matchesSha256Checksum(List<ndef.NDEFRecord> records, List<int> payload) { | ||
| final expectedHash = _externalPayloadForType(records, _bitcoinSha256Type); | ||
| if (expectedHash == null) return true; | ||
|
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| return _bytesEqual(expectedHash, sha256.convert(payload).bytes); | ||
| } | ||
|
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| bool _bytesEqual(List<int> left, List<int> right) { | ||
| if (left.length != right.length) return false; | ||
|
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| for (var i = 0; i < left.length; i++) { | ||
| if (left[i] != right[i]) return false; | ||
| } | ||
|
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||
| return true; | ||
| } |
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Wouldnt this need to have the app id?