This php code decodes the secret key before hashing with SHA 512
$API_SECRET_KEY="W0+m0Dc9GMN9yDVeq3GMDsJ49WasEhQHkNHNuDw3wNg=";
$BDAPI_SECRET_KEY=base64_decode($API_SECRET_KEY);
$HMAC_SIGN = base64_encode(hash_hmac('sha512',$MESSAGE,$BDAPI_SECRET_KEY,true));
echo $HMAC_SIGN;
BfVNi21gY09c8M18cWBRBgo1W9pAlXM99ZVoF7Kz2ETFnIuvXjj8NRvRgn/GaT/m6YJ8efsr5s9EDbIhznAaag==
I want to replicate this in google app script
var Secret = "W0+m0Dc9GMN9yDVeq3GMDsJ49WasEhQHkNHNuDw3wNg="
var BDSecret= Utilities.base64Decode(Secret)
var hmac = Utilities.base64Encode(Utilities.computeHmacSignature(Utilities.MacAlgorithm.HMAC_SHA_512, message, BDSecret ));
Logger.log(hmac)
ew5KhLWSJixn8zw4s6VkpYIwvGBjrmjY3LhNWZr9CVEw6W22LOGg+lVzA3uQgOVyICSCffw2bzTepnBdoYtldw==
If I do not decode the API before hashing they return the same result. But for this particular purpose, the key needs to be decoded. The message variable is just my first name "Parit" in case someone wants to replicate.
I thought that Utilities.computeHmacSignature()
might not be able to use []byte for the value. So as a workaround, how about using jsSHA? I think that in your case, you can use https://github.com/Caligatio/jsSHA/blob/master/src/sha512.js .
The flow for using jsSHA is as follows.
sha512.js
.
Code.gs
of the script editor. myFunction()
of the sample script. function myFunction() {
var message = "Parit";
var secret = "W0+m0Dc9GMN9yDVeq3GMDsJ49WasEhQHkNHNuDw3wNg=";
var obj = new jsSHA("SHA-512", "TEXT");
obj.setHMACKey(secret, "B64");
obj.update(message);
Logger.log(obj.getHMAC("B64"))
}
Parit
for message
, I got BfVNi21gY09c8M18cWBRBgo1W9pAlXM99ZVoF7Kz2ETFnIuvXjj8NRvRgn/GaT/m6YJ8efsr5s9EDbIhznAaag==
. It this was not useful for you, I'm sorry.
By the Google's update at June 19, 2018 , Utilities.computeHmacSignature()
got to be able to use the byte arrays. By this, using only native Google Apps Scvript, the result can be retrieved without using jsSHA. So I would like to update my answer.
function myFunction() {
var message = "Parit";
var secret = "W0+m0Dc9GMN9yDVeq3GMDsJ49WasEhQHkNHNuDw3wNg=";
var value = Utilities.base64Decode(Utilities.base64Encode(message));
var key = Utilities.base64Decode(secret);
var out = Utilities.computeHmacSignature(Utilities.MacAlgorithm.HMAC_SHA_512, value, key);
var res = Utilities.base64Encode(out)
Logger.log(res)
}
BfVNi21gY09c8M18cWBRBgo1W9pAlXM99ZVoF7Kz2ETFnIuvXjj8NRvRgn/GaT/m6YJ8efsr5s9EDbIhznAaag==
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