Hi there, I'm implementing a library to interact with Azure Storage. I'm already blocked at the first step: generate the authentication header. The header generation is described there: http://msdn.microsoft.com/en-us/library/azure/dd179428.aspx An SDK exists for Ruby: https://github.com/Azure/azure-sdk-for-ruby I've taken the tests from the Ruby SDK to drive my implementation. I have a mismatch that I can't solve with the authentication header. You can run the tests or execute the small scenario from the AZSharedKeyAuth class comment to see where the problem is (i've created a temporary storage account for testing, the account name and key are in the class comment). Apparently something goes wrong in the signature= Base64(HMAC-SHA256(UTF8(StringToSign))). My StringToSign seems to be ok (cr vs lf vs crlf possibly put some mess). My code is there: http://smalltalkhub.com/#!/~francois/AzureStorage Can someone have a look? If you're a company that can send invoices, I don't mind to pay consulting fees if you can help...