Yes, they do. Read http://www.imperialviolet.org/2013/02/04/luckythirteen.html http://www.imperialviolet.org/2013/02/04/luckythirteen.html - even a division in

Yes, they do. Read http://www.imperialviolet.org/2013/02/04/luckythirteen.html http://www.imperialviolet.org/2013/02/04/luckythirteen.html - even a division in the cpu may introduce timing differences depending on the input (bottom of the blog post). https://groups.google.com/forum/?fromgroups=#!topic/golang-nuts/HF5O5vAKRcQ https://groups.google.com/forum/?fromgroups=#!topic/golang-n... indicates golangs implentation may not be timing attack safe, but that's another version and I don't know for sure.