sha256 copied from v3.2



git-svn-id: http://rfc5766-turn-server.googlecode.com/svn/trunk@1547 d3c6d0af-6456-5cbd-3218-6188ca4e956b
restapi sha256 fixes



git-svn-id: http://rfc5766-turn-server.googlecode.com/svn/trunk@1550 d3c6d0af-6456-5cbd-3218-6188ca4e956b