tools: getb64key - print the base64 version of a PEM public key file

Change-Id: Ia94ff560c88dfe85c3fa55db5c8219aa0d3419ee

build/tools/getb64key.py

@@ -0,0 +1,18 @@
+#!/usr/bin/env python
+
+from __future__ import print_function
+
+import base64
+import sys
+
+pkFile = open(sys.argv[1], 'rb').readlines()
+base64Key = ""
+inCert = False
+for line in pkFile:
+    if line.startswith(b"-"):
+        inCert = not inCert
+        continue
+
+    base64Key += line.strip()
+
+print(base64.b16encode(base64.b64decode(base64Key)).lower())