flutter 加密安全，不了解这些多线程的基础知识很难学懂网络安全

}

String _stepThree(String str) {

return str;
}

String _inverse(String tag) {

String res = ‘’;
List searchKeywords =
List.generate(tag.length, (index) => tag[index]);
Iterable array = searchKeywords.reversed;
for (var e in array) {

res = ‘ r e s res rese’;
}
return res;
}

String _ivStepOne() {

String res = ‘’;
String map = _generateMd5(chatSign) + _generateMd5(nickName);
int index = _gameIdSort[_gameIdSort.length - 2];
while (res.length < 50) {

res += map[index];
index++;
}
index = 0;
return res;
}

String _ivStepTwo() {

String res = ‘’;
String map = _generateMd5(_inverse(chatSign)) + _generateMd5(chatSign);
int index = _gameIdSort[_gameIdSort.length - 1];
while (res.length < 50) {

res += map[index];
index++;
}
index = 0;
return _inverse(res);
}

/// 字符串转 十六进制
String _strToHex(String str) {

List charCodes = str.runes.toList();
return charCodes.map((code) => code.toRadixString(16)).join(‘’);
}

/// 字符串转 base64
String _encodeBase64(String data) {

return base64Encode(utf8.encode(data));
}

/// base64转 普通字符
String _decodeBase64(String data) {

return String.fromCharCodes(base64Decode(data));
}

String _generateMd5(String str) {

return md5.convert(utf8.encode(str)).toString();
}

int _magic(int num) {

if (num < 3) {

return 1;
} else {

return _magic(num - 1) + _magic(num - 2);
}
}
}

调用的地方：

MatchRequestData data = MatchRequestData (
gameId: userArray[i][‘gameID’],
chatSign: userArray[i][‘chatSign’],
nickName: userArray[i][‘nickName’],
);

//需要传递给