为什么一个base64连接codeD字符串必须在最后一个等号（=） [英] Why does a base64 encoded string have an = sign at the end

问题描述

我知道什么是的base64 编码是如何计算的base64 在C＃编码，但我见过好几次当我将一个字符串转换的base64，有一个 = 结尾。

的几个问题提出了：

1. 难道一个的base64 字符串总是与 = 结束？


2. 为什么一个 = 末得到追加？

解决方案

它作为填充。

一个更完整的答案是，一个base64连接codeD字符串不的总是的有端 = ，它只会结束被一个或两个 = 如果它们需要垫串输出到适当的长度。

I know what base64 encoding is and how to calculate base64 encoding in C#, however I have seen several times that when I convert a string into base64, there is an = at the end.

A few questions came up:

1. Does a base64 string always end with =?
2. Why does an = get appended at the end?

解决方案

It serves as padding.

A more complete answer is that a base64 encoded string doesn't always end with a =, it will only end with one or two = if they are required to pad the string out to the proper length.

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