如何使用nodejs（crypto）生成32字节的SHA256哈希，以避免从tweetnacl.js抛出错误的密钥大小错误？ [英] How to generate a SHA256 hash of 32 bytes using nodejs (crypto) in order to avoid bad key size error thrown from tweetnacl.js?
问题描述
我正在使用node.js的 crypto 模块来生成这样的SHA256哈希：
I am using the crypto module of node.js to generate a SHA256 hash like this:
const key = crypto.createHmac('sha256', data).digest('hex');
现在， tweetnacl 在 secretbox 错误密钥大小 $ c>：
Now, tweetnacl throws the error: bad key size when the key is passed in the secretbox:
nacl.secretbox(data, Rnonc, key);
由于 secretbox 要求参数为Uint8Array。
The parameters are converted into Uint8Array since the secretbox requires arguments to be Uint8Array.
错误：错误密钥大小从此处 tweetnacl 由于 crypto_secretbox_KEYBYTES 被定义为 32 这里。问题是从 crypto 返回的密钥大小不是32字节。
The error: bad key size is throw from here in tweetnacl since the crypto_secretbox_KEYBYTES is defined as 32 here. The problem is the key returned from crypto is in not 32 bytes size.
我搜索了SO和相关网站，但找不到任何可行的解决办法，但根据 this - 转换为十六进制的SHA256哈希产生：
I have searched SO and relevant sites, but couldn't find any feasible solution but according to this - the SHA256 hash converted to hex produces:
32单独十六进制数（或32字节）
32 separate hexadecimal numbers (or 32 bytes)
如何使用node.js生成32字节的SHA256密钥以避免此错误？在生成SHA256哈希时，我有什么问题吗？
How can I generate a SHA256 key of 32 bytes in order to avoid this error using node.js? Is there something I am doing wrong in generating the SHA256 hash?
推荐答案
以下代码片段解决了生成32字节SHA256哈希的问题，避免了从tweetnacl.js抛出的错误密钥大小错误：
The following code snippet solved the issue of generating a 32 bytes SHA256 hash avoiding the bad key size error thrown from tweetnacl.js:
const CryptoJS = require('crypto-js');
let hash = CryptoJS.SHA256('hello world');
let buffer = Buffer.from(hash.toString(CryptoJS.enc.Hex), 'hex');
let array = new Uint8Array(buffer);
这总是生成一个32字节的 Uint8Array 尺寸。请注意，我必须使用 crypto-js 模块，尽管我更喜欢使用原生加密模块，但我猜我它现在只是使用它，因为它是一个有效的解决方案。
This always generates a Uint8Array of 32 bytes size. Notice here I had to use the crypto-js module although I preferred to use the native crypto module but I guess I would just use it for now as it is a working solution.
感谢@Arihant指向这（查看评论部分）
Thanks to @Arihant for pointing to this (check the comment section)
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