1

Does the upload file to blob feature of the azure-iot-sdk-c currently implement any integrity checks such as an md5 hash of the blob contents? I am aware of the c-sharp sdk doing this, but I need confirmation on the c sdk.

radish25
  • 75
  • 7

1 Answers1

1

The only mentioning of hashing for azure-iot-sdk-c, is through the use of hsm_client_sign_with_identity, for custom HSM, the documentation can be found here. C# and Python do have the abilities stated in this doc

Adam Smith - Microsoft Azure
  • 2,495
  • 2
  • 12
  • 24
  • 1
    Using the Azure Storage SDK I can achieve this correct? – radish25 Aug 01 '18 at 02:16
  • yes it is supported in the Storage SDK, this is an old but still valid blog post about it: https://blogs.msdn.microsoft.com/windowsazurestorage/2011/02/17/windows-azure-blob-md5-overview/ I hope this helps. – Adam Smith - Microsoft Azure Aug 01 '18 at 16:25
  • @radish25 I'd appreciate if you could either upvote or mark as an answer the proposed answer if it helped resolve your question. This would help future community members find the question and response in the future, and it would keep our Azure Community close to quick answers :) Thanks ! – Adam Smith - Microsoft Azure Aug 01 '18 at 16:37
  • Hey Adam, one more quick question. The communication between the iot device and hub for the purposes of storage occurs over https. Does this allow me to rest assured that the content of my upload is unchanged. I found that with the storage API you can set an MD5 hash but one of the MSFT developers mentioned that https by default will also prevent against bitflips. Is this the case? – radish25 Aug 01 '18 at 18:34
  • @radish25 Correct https protects you from bitflips on the storage service, this pertains to python blockblobservice but same is valid for others: https://github.com/Azure/azure-storage-python/blob/master/azure-storage-blob/azure/storage/blob/blockblobservice.py#L152 Line 152 through 171 discusses this case. – Adam Smith - Microsoft Azure Aug 02 '18 at 16:28