The reason I asked for an empty file's MD5 is to compare them and see if there was a wrong hash being generated, since *d41d8cd98f00b204e9800998ecf8427e* is the correct "blank" MD5. But as Barry noted, it looks like both implementations are generating the correct MD5 sums, the only difference seems to be that Prod base64 encodes the hash.
In your original post, you wrote that "*decoding it with Base64 does not match with what I get locally.*" Can you share the test file you used in your first trial? If you can't share the test file (which is not a problem at all) can you try repeating the test with a large file? ----------------- -Vinny P Technology & Media Advisor Chicago, IL App Engine Code Samples: http://www.learntogoogleit.com On Tuesday, March 11, 2014 1:28:58 PM UTC-5, Stephan wrote: > > 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] <javascript:>> > *An:* "[email protected] <javascript:>" < > [email protected] <javascript:>> > *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 > > > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/google-appengine. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/google-appengine. For more options, visit https://groups.google.com/d/optout.
