beberlei/azure-blob-storage — pull request #4 by matejskubic (2012-12-02 20:02:47+00:00)
Title: Support for Content-MD5 header

base64 encoded 128 bits of MD5 hash of the contnet

http://msdn.microsoft.com/en-us/library/windowsazure/dd179451.aspx
http://blogs.msdn.com/b/windowsazurestorage/archive/2011/02/18/windows-azure-blob-md5-overview.aspx