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Azure Blob link

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  • Azure Blob link

    Hi Guys,

    I am working on producing a button that calls an xbasic function which generates a variable when the user clicks it on a row. That variable would then be available to produce a url that would be opened on the browser. I think I can get the variable back to the browser, but the trouble I am having is figuring out how to properly write the function. That being said, the variable I am trying to produce is as follows...

    Ultimately we are trying to produce a code that is a shared access key generator for Windows Azure.

    StringToSign = r + \n
    2009-02-09 + \n
    2009-02-10 + \n
    /myaccount/pictures + \n
    YWJjZGVmZw== + \n

    HMAC-SHA256(URL.Decode(UTF8.Encode(StringToSign))) = dD80ihBh5jfNpymO5Hg1IdiJIEvHcJpCMiCMnN/RnbI=

    This was taken from there is also a method via javascript here but I am trying to do this in xbasic server side as the security note of the javascript method could leave the critical key information vulnerable.

    I expect the code would go something like...

    function azure_sas_url as v (e as p)
    StringToSign = r + \n
    date() + \n
    date() + \n
    e.rowData.filename + \n
    e.rowData.sigId== + \n

    'The 2012-02-12 is a signed version date

    azure_sas_url = hmac_hash(urldecode( --? 'This is where I seem to loose what I am trying to do

    Any thoughts on how I would accomplish this in Xbasic? I know the hmac_hash fuction and url decode functions are inside Alpha what other functions would I use to accomplish this to the exact method that Azure would require. This is similar to Amazon S3 also.

    Thanks for any help.

  • #2
    Re: Azure Blob link

    Ok so I figured how to write it to at least work (the code will vary based on what you are designing) , however, for some reason I cannot get the hmac_hash to produce an HMACSHA256 code that matches Azure. That being said, I have abandoned this for now. I have chosen to deploy using Amazon as I have no problem generating the key for Amazon. If anyone has any counsel on the proper coding to make the appropriate key for Azure it will be appreciated here.

    For those of you needing help in the direction to start with...

    *This will generally only make sense if you have read the background information and website links above^^^ and at least a small understanding of xbasic*

    Your function will include at a minimum resource and blob/container type, but may include one or more of start and expire time, version id, policy, etc. You will have to configure it to produce the times you need based on iso8061.

    Once you have written your StringToSign, then you will need to generate your hmacsha256 key. The "\n" can also be replaced as chr(10) since \n is referencing a newlinefeed.

    Your hmacsha256 key will look something like this hmac_hash(urldecode(convert_acp_to_utf8(StringToSign)), {your azure key}, "HMACSHA256"). I believe the hmac_hash function returns an already 64bit encoded version. If I 64bit encode the key, then returns it void to azure so it must already be a 64bit key. Nevertheless, here is where it gets tricky. I have tried multiple times to generate and Azure will even acknowledge reading the signature and tell me what the StringToSign is but then says the signature doesn't match the StringToSign, even reducing it to two variables (resource and policy) and still no luck. I check the ?StringToSign in interactive and it matches exactly what Azure says it should be. However, either the hmac_hash function is using a different algorithim, I am missing some element that needs to be included in the hash or encoding, or MS is not providing enough documentation concerning what keys to use etc. However, the same general setup will produce the proper key for Amazon using the HMACSHA1 algorithim. If anyone has suggestions please post.

    Last edited by jthornton; 11-14-2013, 12:08 PM.