英文:
how to convert a number to base32 in java as per RFC-4648
问题
实际上我正在尝试在我的应用程序中使用TOTP，而谷歌身份验证器要求密钥以base32格式提供。这就是我试图将密钥转换为base32格式的原因。
假设我有一个数字 = 150820200825235。
这个链接的维基百科页面说明了RFC-4648是最常用的base32字母表。
下面是我尝试将数字转换为base32的Java代码：
long key=150820200825235L;
String base32Key = Long.toString(key,32);
System.out.println(base32Key);
现在它会打印以下输出：
> 495e87tgcj
其中包含了数字9，根据RFC-4648是无效的。
如何按照RFC-4648将数字转换为base32在Java中？
还有一件事，如果最常用的Base32字母表真的是按照RFC-4648的话，为什么Java不将其作为默认支持？或者是我理解/代码中有什么问题？
英文:
Actually I'm trying to use TOTP in my app and google authenticator requires the key to be in base32 format. This is the reason I'm trying to convert a key to base32 format
Let's say I have a number = 150820200825235.
This wikipedia page says that RFC-4648 is the most common base32 alphabet used.
Here's my java code where I'm trying to convert a number to base 32:
long key=150820200825235L;
String base32Key = Long.toString(key,32);
System.out.println(base32Key);
Now it is printing this as the output :
> 495e87tgcj
It contains 9 which is invalid according to RFC-4648.
how do I convert to base32 number as per RFC-4648 in java?
One more thing If the most widely used Base32 alphabet is really as per RFC-4648 then why doesn't java support it as default? or is something is wrong in my understanding/code ?
答案1
得分: 1
"Base32"，如RFC-4648中定义，是一种将二进制数据（"任意字节序列"）编码为仅使用数字、大写字母和=进行填充的ASCII文本的方法。您可以在Apache Commons Codec库中找到实现。
如果您从像150820200825235这样的数字开始，想要将其转换为RFC 4648 base32格式，首先您需要决定如何将数字转换为字节序列。
例如，将long值转换为字节的一种方法是使用DataOutputStream.writeLong方法。该方法使用8个字节。使用此方法写入150820200825235L并将结果字节编码为base32，您将得到AAAISK4QP3AZG===。
英文:
"Base32" as defined in RFC-4648 is a way to encode binary data ("arbitrary sequences of octets") in ASCII text using only numbers, upper case letters, and = for padding. You can find an implementation in the Apache Commons Codec library
If you start with a number like 150820200825235 and want to convert it into RFC 4648 base32, first you need to decide how to convert the number into a sequence of bytes.
Foe example, One way to convert a long value into bytes is using the DataOutputStream.writeLong method. This method uses 8 bytes. Using this method to write 150820200825235L and encoding the resulting bytes in base32 gives you AAAISK4QP3AZG===.
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