为什么我无法计算正确的HMAC签名？ [英] Why can't I compute a correct HMAC signature?

问题描述

我正在尝试计算Google Apps Script中的HMAC签名，但文档并未完全清楚我需要如何传递参数，而且我一直无法获得预期的输出结果。

---

为了确定我是否得到正确的输出，我将结果与已知的良好PHP代码进行了比较。该代码是：

  $ key =a2V5; ＃这是keybase64编码
 $ value =test; 
 $ result = base64_encode（hash_hmac（'sha512'，$ value，base64_decode（$ key），true））; 
  

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我在Google Apps Script中的代码是：

  key =a2V5; //这是keybase64编码
 value =test; 
 result = Utilities.base64Encode（Utilities.computeHmacSignature（Utilities.MacAlgorithm.HMAC_SHA_512，value，Utilities.base64Decode（key）））; 
  

我预期收到的结果是：

  KHoPuJp / vfpbVThjaRjlN6W4MGXk / zMSaLeqoRXd4EepsPT7W4KGCPwLYyfxAFX3Y3sFjp4Nu55piQGj5t1GHA == 
  

取而代之的是：

  mGXJ3X / nH5ZIFUAPtf1PsViY50pD3cfU7J8w2KAIEAqrAgZ3dpKcuy5V1yvH4 / C5n1C9rFFsKc2JKHTwUqPscQ == 
  

我在这里弄到了什么？

解决方案

有一件事引起了我的注意：
$ b $ p $ Utilities.base64Decode（key）方法返回 Byte []
Utilities.computeHmacSignature（macAlgorithm，value，key）接受3个参数。 值和键类型为字符串。

也许这是问题所在。为什么不尝试类似下面的方法，然后检查结果：

  key =a2V5; //这是keybase64编码的
 clearKey =key; 
 value =test; 
 result = Utilities.base64Encode（Utilities.computeHmacSignature（Utilities.MacAlgorithm.HMAC_SHA_512，value，clearKey））; 
  

我检查Google Apps脚本这里。

I am trying to compute an HMAC signature in Google Apps Script, but the documentation isn't 100% clear on how I need to pass in the parameters, and I have been unable to get the expected output.

---

To determine if I am getting correct output, I am comparing the result against known-good PHP code. That code is:

$key = "a2V5"; # this is "key" base64-encoded
$value = "test";
$result = base64_encode(hash_hmac('sha512', $value, base64_decode($key), true));

---

My code in Google Apps Script is:

key = "a2V5"; // this is "key" base64-encoded
value = "test";
result = Utilities.base64Encode(Utilities.computeHmacSignature(Utilities.MacAlgorithm.HMAC_SHA_512, value, Utilities.base64Decode(key)));

The output I expected to receive was:

KHoPuJp/vfpbVThjaRjlN6W4MGXk/zMSaLeqoRXd4EepsPT7W4KGCPwLYyfxAFX3Y3sFjp4Nu55piQGj5t1GHA==

But what I got instead was:

mGXJ3X/nH5ZIFUAPtf1PsViY50pD3cfU7J8w2KAIEAqrAgZ3dpKcuy5V1yvH4/C5n1C9rFFsKc2JKHTwUqPscQ==

What did I screw up here?

解决方案

I reviewed your code and there is one thing which caught my eye:

Utilities.base64Decode(key) method returns Byte[] Utilities.computeHmacSignature(macAlgorithm, value, key) accepts 3 parameters. value and key are of type string.

Maybe this is the issue. Why don't you try something like the following and check results then:

key = "a2V5"; // this is "key" base64-encoded
clearKey = "key";
value = "test";
result = Utilities.base64Encode(Utilities.computeHmacSignature(Utilities.MacAlgorithm.HMAC_SHA_512, value, clearKey));

I check Google Apps Script here.

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