import 'dart:typed_data';
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class CryptoUtil {
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static List<int>? hex2List(String hexStr) {
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if (hexStr == null || hexStr.length % 2 != 0) {
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//十六进制字符串错误
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return null;
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}
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if (hexStr.startsWith('0x')) {
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hexStr = hexStr.substring(2);
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}
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List<int> result = List.filled(hexStr.length ~/ 2,0);
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String temp = '0123456789ABCDEF';
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for (int i = 0; i < hexStr.length; i += 2) {
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int h = temp.indexOf(hexStr.substring(i, i + 1));
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int l = temp.indexOf(hexStr.substring(i + 1, i + 2));
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result[i ~/ 2] = (h * 16 + l);
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}
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return result;
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}
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static String list2Hex(List<int> list) {
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List<String> results = List.filled(list.length * 2,"");
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String temp = '0123456789ABCDEF';
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for (int i = 0; i < list.length; i++) {
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int h = list[i] ~/ 16;
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int l = list[i] % 16;
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results[i * 2] = temp.substring(h, h + 1);
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results[i * 2 + 1] = temp.substring(l, l + 1);
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}
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return results.join();
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}
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}
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