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feat: Legacy XprvDouble Support #31

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feat: Legacy XprvDouble Support #31

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36 changes: 36 additions & 0 deletions lib/src/crypto/hd_wallet/extended_private_key.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -176,6 +176,42 @@ class Xprv extends ExtendedKey {
}
}

static List<Xprv> fromEncryptedXprvDouble(String xprvDouble, String password) {
try {
Bech32 bech = bech32.decode(xprvDouble, 478);
List<int> checksum = createChecksum(bech.hrp, bech.data);
bool invalidXprvChecksum =
!verifyChecksum(bech.hrp, [...bech.data, ...checksum]);
if (invalidXprvChecksum) {
throw InvalidChecksum();
}

Uint8List data = Uint8List.fromList(
convertBits(data: bech.data, from: 5, to: 8, pad: false));
Uint8List iv = data.sublist(0, 16);
Uint8List salt = data.sublist(16, 48);
Uint8List _data = data.sublist(48);

CodecAES codec = getCodecAES(password, salt: salt, iv: iv);
Uint8List decoded = codec.decode(bytesToHex(_data)) as Uint8List;

decoded = decoded.sublist(0, 234);
String plainText;
plainText = utf8.decode(decoded).trim();

String internalXprvStr = plainText.substring(0, 117);
String externalXprvStr = plainText.substring(117);

return [Xprv.fromXprv(internalXprvStr), Xprv.fromXprv(externalXprvStr)];
} catch (e) {
if (e.runtimeType == InvalidChecksum) {
rethrow;
}
throw AesCryptDataException('${e.toString()}');
}
}


String toEncryptedXprv({required String password}) {
String xprvStr = toSlip32();
List<int> tmp = xprvStr.codeUnits;
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14 changes: 14 additions & 0 deletions test/extended_key_test.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,10 @@ main() async {
test('XPUB', () {
expect(xpubTest(), true);
});

test('XPRV Double', () {
expect(xprvDoubleTest(), true);
});
}

bool xprvTest() {
Expand All @@ -51,3 +55,13 @@ bool xpubTest() {
}
return true;
}

bool xprvDoubleTest(){
String xprvDouble = "xprvdouble1ae5gfvwm339antauxg9zf7ads86ex6nj00syqghdsw5fmgu4lfx0s4zs6tt2txhznq8g47tzdhwh6pq2xmq2r92qed5cyykh2wesgzhldyzusksclcf6uq54jyzcm86f3p3nu5jmqm0vdhdf7hmac9ylkgjjlhs3fc3vd7tqsn53evszlseslxrztp00lg5vxrsj2l8caskv6xrs5gw8xnnlhzw5pq0j4yd0rvgw422fz6xeteru54n0lwfprmnwu6zl2e7nktarr6dh5n22ztk305veu4eegnxvr7a96dcrgm7cdqde2gmf2jgveppp77hpzkulx4af0kz2mawcmyxe97csqsjm5h2fx9aw8anfgsn3jp40h8gjy5ap5fgddfr808k7ldspf3xvxfkw8elx9rshhlwuyk29cmnsd3sazak27dndnumdwj9hp34kh7g86kgtarzcsr5dzl9";
String expectedInternal = "xprv1qrmya03vnt8sa4mlgnnwahv22hlx57gqvjxakyj96y9kn7exnrxhsqrzrjjkm5dd90e569azx4hvtkr9amf5ezvmq9ltkazy0um0t5pq8qm7ea7l";
String expectedExternal = "xprv1qrzzrpdng7henalmkjl5r782r6d3hec0rfzs0a7tuchfnay84a90gqxsmjc2hfchjek9d9q45xssrqw5uyhzqrxsme89kvxnvtfsvdhdjgkv3zf6";
var result = Xprv.fromEncryptedXprvDouble(xprvDouble, "password");
assert(result[0].toSlip32() == expectedInternal);
assert(result[1].toSlip32() == expectedExternal);
return true;
}