gcr-viewer does not recognize OID 1.2.840.10045.2.1, which is EC Public Key. Attached is the relevant screen capture. $ gcr-viewer --version GCR Certificate and Key Viewer -- 3.4.1 Debian 7.3, x64 (fully patched): $ uname -a Linux debian-q500 3.2.0-4-amd64 #1 SMP Debian 3.2.54-2 x86_64 GNU/Linux