Add NIST PKIX validation test suite

Change-Id: I44b8e759e38f074174df745c39979acc5334c778
diff --git a/pkits.version b/pkits.version
new file mode 100644
index 0000000..9b0716d
--- /dev/null
+++ b/pkits.version
@@ -0,0 +1,3 @@
+# sha256sum of PKITS
+506913f4b727704ee1b52b17aa472dc6fbcf01e41e7ad88ba505f29c1a74d9ea *PKITS.pdf
+592f66030d2eff80fced7ad022e197d96b7ee4ccce7da9df9c9b2007b1665665 *PKITS_data.zip