xmlsec1 from Cloud:OpenStack:Upstream:Pike:SLE_12_SP2 project
Select Your Operating System
Add repository and install manually
For SLE 12 SP2 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Cloud:OpenStack:Upstream:Pike:SLE_12_SP2/SLE_12_SP2/Cloud:OpenStack:Upstream:Pike:SLE_12_SP2.repo zypper refresh zypper install xmlsec1