Okay so I am trying to create an aws v4 signature using this template from Amazon in javascript, with node.js. I am using the template's credentials , region, date, and service in order to test my signing function.
I am using the following format to generate my signature: Link to image
My StringToSign is the base64 encoded POST policy from the template :
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
And my signing key is generated using the following code from acquired from the amazon signature v4 key derivation template
var crypto = require("crypto-js");
function getSignatureKey(Crypto, key, dateStamp, regionName, serviceName) {
var kDate = Crypto.HmacSHA256(dateStamp, "AWS4" + key);
var kRegion = Crypto.HmacSHA256(regionName, kDate);
var kService = Crypto.HmacSHA256(serviceName, kRegion);
var kSigning = Crypto.HmacSHA256("aws4_request", kService);
return kSigning;
}
My key is the SecretAccessKey from the template linked above (wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY) , my date is "20151229", my region is "us-east-1" and my service name is "s3"
And finally, to get the output I am using
var signature = cryptojs.HmacSHA256(stringToSign, signingKey).toString()
The expected output from the calculation is:
46503978d3596de22955b4b18d6dfb1d54e8c5958727d5bdcd02cc1119c60fc9
But the output I am getting is:
8afdbf4008c03f22c2cd3cdb72e4afbb1f6a588f3255ac628749a66d7f09699e
If you see where I went wrong please let me know as I think I have followed amazon's template but it seems I have made an error somewhere