Aw: Re: [google-appengine] How is MD5 hash of a blobstore blob encoded?

Stephan Hartmann Tue, 11 Mar 2014 11:29:30 -0700

Hi Vinny,

Thanks for your time.

I've uploaded an empty file and here is what I get from BlobInfo.getMd5Hash():

Development Server: d41d8cd98f00b204e9800998ecf8427e

AppEngine Prod: ZDQxZDhjZDk4ZjAwYjIwNGU5ODAwOTk4ZWNmODQyN2U=

Hope you can shed some light on this.

I don't expect that it will be fixed in the near future but I really need to know the encoding and hashing algorithm that is used on GAE production, so if someone could take a look into the code would be great.

Kind regards,

Stephan

Gesendet: Dienstag, 11. März 2014 um 04:38 Uhr
Von: "Vinny P" <[email protected]>
An: "[email protected]" <[email protected]>
Betreff: Re: [google-appengine] How is MD5 hash of a blobstore blob encoded?

On Mon, Mar 10, 2014 at 6:27 AM, Stephan Hartmann <[email protected]> wrote:

On the development server BlobInfo.getMd5Hash() returns a String (why not binary array?) that seems to be the hex endoded hash value. I can proof this true with hashing the file locally.
However on Appengine getMd5Hash() returns something different.

It seems to be Base64 encoded, but decoding it with Base64 does not match with what I get locally.

Can you try uploading an empty file to both your development environment and production App Engine, and seeing what the MD5 hash for each comes out to be?

-----------------

-Vinny P

Technology & Media Advisor

Chicago, IL

App Engine Code Samples: http://www.learntogoogleit.com

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Aw: Re: [google-appengine] How is MD5 hash of a blobstore blob encoded?

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