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Asked: 2026-06-17T21:15:54+00:00

I’m using the HMAC hash for securing data. I hash data on the client,

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I’m using the HMAC hash for securing data. I hash data on the client, reconstruct the hash on the server, and compare. The hashing on the server (a web api) uses a specific salt for encrypting the data. I now need to use the same salt for my Windows 8 application (using JavaScript API). I have the code in place to perform the hash, but how do I supply a salt for generating the hash, so I can recreate the same hash on JavaScript client and server?

This isn’t a server question, but specific to the client JavaScript windows 8 application. Here is my code that I use for hashing. However, I can’t find anything in the API that allows me to change the salt…

var provider = Windows.Security.Cryptography.Core.HashAlgorithmProvider.openAlgorithm(
    Windows.Security.Cryptography.Core.HashAlgorithmNames.sha1);
var hash = provider.createHash();
var binary = Windows.Security.Cryptography.CryptographicBuffer.convertStringToBinary(myData, 
         Windows.Security.Cryptography.BinaryStringEncoding.utf8);
hash.append(binary);

var outputHashBinary = hash.getValueAndReset();
var base64Ticket = Windows.Security.Cryptography.CryptographicBuffer.encodeToBase64String(outputHashBinary);
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1 Answer

  1. Editorial Team

    Instead of HashAlgorithmProvider, you should use MacAlgorithmProvider.

    Here is MSDN article about MacAlgorithmProvider with a sample in JavaScript language
    http://msdn.microsoft.com/en-us/library/windows/apps/windows.security.cryptography.core.macalgorithmprovider.aspx?cs-save-lang=1&cs-lang=javascript#code-snippet-1

    The example tries to create HMAC as you like

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