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@@ -1,7 +1,8 @@
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import 'dart:convert' show utf8;
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import 'dart:typed_data';
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-
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import 'package:convert/convert.dart' show hex;
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+import "package:pointycastle/digests/keccak.dart";
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+
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bool isHexPrefixed(String str) {
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ArgumentError.checkNotNull(str);
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@@ -221,3 +222,56 @@ String dec2hex(String decString) {
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+
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+
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+/// ----- to Hash -----
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+/// 注意：Hash256 和 Keccak256 其实不一样，
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+/// 但由于最早接触 Ethereum 相关代码，其中 Hash 使用的是 Keccak256，
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+/// 造成App其他地方的 Hash 也都沿用了 Keccak256。
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+/// 历史原因，不做修改。[2023-12-15 James.Zhang]
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+
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+String toHash(String anyString) {
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+ return toKeccak256(anyString);
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+}
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+
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+String toKeccak256(String anyString, [int bitLength = 256]) {
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+ var keccak = KeccakDigest(bitLength);
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+ keccak.update(
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+ Uint8List.fromList(anyString.codeUnits),
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+ 0,
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+ anyString.codeUnits.length,
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+ );
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+
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+ var out = Uint8List(bitLength ~/ 8);
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+ keccak.doFinal(out, 0);
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+
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+ return _uint8ListToHex(out);
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+}
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+
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+/// Character `0`.
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+const int _zero = 0x30;
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+/// Character `a`.
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+const int _a = 0x61;
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+
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+String _uint8ListToHex(List<int> bytes) {
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+ final buffer = Uint8List(bytes.length * 2);
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+
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+ int bufferIndex = 0;
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+ for (var i = 0; i < bytes.length; i++) {
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+ var byte = bytes[i];
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+
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+ // The bitwise arithmetic here is equivalent to `byte ~/ 16` and `byte % 16`
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+ // for valid byte values, but is easier for dart2js to optimize given that
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+ // it can't prove that [byte] will always be positive.
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+ buffer[bufferIndex++] = _codeUnitForDigit((byte & 0xF0) >> 4);
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+ buffer[bufferIndex++] = _codeUnitForDigit(byte & 0x0F);
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+ }
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+
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+ return String.fromCharCodes(buffer);
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+}
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+
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+/// Returns the ASCII/Unicode code unit corresponding to the hexadecimal digit
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+/// [digit].
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+int _codeUnitForDigit(int digit) =>
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+ digit < 10 ? digit + _zero : digit + _a - 10;
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+
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