如何解密 HMAC? [英] How can I decrypt a HMAC?

问题描述

我可以使用以下方法制作 HMAC:

I can make an HMAC using the following:

var encrypt = crypto.createHmac("SHA256", secret).update(string).digest('base64');

我正在尝试使用密钥解密编码的 HMAC:

I am trying to decrypt an encoded HMAC with the secret:

var decrypt = crypto.createDecipher("SHA256", secret).update(string).final("ascii");

以下操作不成功.如何使用密钥解密 HMAC?

The following was unsuccessful. How can I decrypt a HMAC with the key?

我收到以下错误:

node-crypto : Unknown cipher SHA256

crypto.js:155
  return (new Decipher).init(cipher, password);
                        ^
Error: DecipherInit error

推荐答案

HMAC 是 MAC/keyed hash，而不是密码.它不是为解密而设计的.如果您想加密某些内容，请使用密码(例如 AES)，最好使用经过身份验证的模式(例如 AES-GCM).

HMAC is a MAC/keyed hash, not a cipher. It's not designed to be decrypted. If you want to encrypt something, use a cipher, like AES, preferably in an authenticated mode like AES-GCM.

解密"的唯一方法是猜测整个输入，然后比较输出.

The only way to "decrypt" is guessing the whole input and then comparing the output.

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