mirror of
https://github.com/cypherstack/stack_wallet.git
synced 2024-12-29 14:59:23 +00:00
87 lines
2.2 KiB
Dart
87 lines
2.2 KiB
Dart
import 'dart:typed_data';
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import 'package:coinlib_flutter/coinlib_flutter.dart' as coinlib;
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const OP_EXCHANGEADDR = 0xe0;
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class EXP2PKHAddress implements coinlib.Address {
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/// The 160bit public key or redeemScript hash for the base58 address
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final Uint8List _hash;
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/// The network and address type version of the address
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final Uint8List version;
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String? _encodedCache;
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EXP2PKHAddress._(Uint8List hash, this.version) : _hash = hash {
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if (version.length != 3) {
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throw ArgumentError(
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"version bytes length must be 3",
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);
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}
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}
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factory EXP2PKHAddress.fromString(String encoded, Uint8List versionBytes) {
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if (versionBytes.length != 3) {
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throw ArgumentError(
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"version bytes length must be 3",
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);
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}
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final data = coinlib.base58Decode(encoded);
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if (data.length != 23) throw coinlib.InvalidAddress();
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final version = data.sublist(0, 3);
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for (int i = 0; i < 3; i++) {
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if (version[i] != versionBytes[i]) {
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throw Exception("EX address version bytes do not match");
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}
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}
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final payload = data.sublist(3);
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final addr = EXP2PKHAddress._(payload, version);
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addr._encodedCache = encoded;
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return addr;
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}
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@override
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String toString() => _encodedCache.toString();
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@override
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coinlib.Program get program => EXP2PKH.fromHash(_hash);
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}
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class EXP2PKH implements coinlib.Program {
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static const template =
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"OP_EXCHANGEADDR OP_DUP OP_HASH160 <20-bytes> OP_EQUALVERIFY OP_CHECKSIG";
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@override
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final coinlib.Script script;
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EXP2PKH.fromScript(this.script);
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factory EXP2PKH.fromHash(Uint8List pkHash) {
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final List<coinlib.ScriptOp> ops = [
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coinlib.ScriptOpCode(OP_EXCHANGEADDR),
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];
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final parts = template.split(" ").sublist(1);
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for (final name in parts) {
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if (name.startsWith("OP_")) {
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ops.add(
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coinlib.ScriptOpCode(
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coinlib.scriptOpNameToCode[name.substring(3)]!,
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),
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);
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} else if (name == "<20-bytes>") {
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ops.add(coinlib.ScriptPushData(pkHash));
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} else {
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throw Exception("Something went wrong in this hacked code");
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}
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}
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return EXP2PKH.fromScript(coinlib.Script(ops));
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}
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}
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