如何哈希std :: string? [英] How to hash std::string?

问题描述

我正在使用一个小工具来帮助我通过重复记住密码.我想输入密码，该密码每天只能记住一次，而不是每次会话之前都可以记住.当然，我自己不会存储密码，但会很乐意存储其哈希值.

I'm making a little utility to help me remember passwords by repetition. I'd like to enter password to be remembered only once every day and not before each session. Of course, I wouldn't store a password itself, but would gladly store its hash.

那么，使用C ++标准库从std::string获取哈希的最简单方法是什么?

So, what are the easiest ways to get a hash from std::string using the C++ Standard Library?

推荐答案

对于不涉及外部库的快速解决方案，可以使用hash<std::string>哈希string.通过包含头文件hash_map或unordered_map(或其他一些文件)来定义.

For a quick solution involving no external libraries, you can use hash<std::string> to hash strings. It's defined by including the header files hash_map or unordered_map (or some others too).

#include <string>
#include <unordered_map>

hash<string> hasher;

string s = "heyho";

size_t hash = hasher(s);

如果您决定要增加SHA的安全性，并且不需要其他所有功能，则不必下载大型的Crypto ++库.互联网上有很多独立的实现，只需搜索"sha实现c ++"即可.

If you decide you want the added security of SHA, you don't have to download the large Crypto++ library if you don't need all its other features; there are plenty of standalone implementations on the internet, just search for "sha implementation c++".

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