Update template verifier

scripts/messages/message_template.msg.b2

+76acfefb6e94d49d562e67e0a871be7c123e9f4c8be36cbb0c7a3359da7b8a96e24bc3a2fb033d1f866eeefe7eca3791f9da52b9f7aa5b0d594799a0ba3399ae
\ No newline at end of file

scripts/messages/message_template.msg.sha1

-dddb11f7e45f1779ff536819f36a20e63d572ba8
\ No newline at end of file

scripts/template_verifier.py

@@ -240,7 +240,7 @@ def run(sysargs):
         default=False,  help="""Set to true to attempt use local cached copy of the master template.""")
     parser.add_option(
         '-f', '--force', action='store_true', dest='force_verification',
-        default=False, help="""Set to true to skip the sha_256 check and force template verification.""")
+        default=False, help="""Set to true to skip the blake2 check and force template verification.""")
 
     options, args = parser.parse_args(sysargs)
 
@@ -279,13 +279,13 @@ def run(sysargs):
 
     # retrieve the contents of the local template
     current = fetch(current_url)
-    hexdigest = hashlib.sha256(current).hexdigest()
+    hexdigest = hashlib.blake2b(current).hexdigest()
     if not options.force_verification:
         # Early exist if the template hasn't changed.
-        sha_url = "%s.sha256" % current_url
-        current_sha = fetch(sha_url)
-        if hexdigest == current_sha:
-            print("Message template SHA_256 has not changed.")
+        b2_url = "%s.b2" % current_url
+        current_b2b = fetch(b2_url)
+        if hexdigest == current_b2b:
+            print("Message template BLAKE2 has not changed.")
             sys.exit(0)
 
     # and check for syntax
@@ -320,10 +320,10 @@ def explain(header, compat):
     if acceptable:
         explain("--- PASS ---", compat)
         if options.force_verification == False:
-            print("Updating sha256 to %s" % hexdigest)
-            sha_filename = "%s.sha256" % current_filename
-            with open(sha_filename, 'w') as sha_file:
-                sha_file.write(hexdigest)
+            print("Updating blake2 hash to %s" % hexdigest)
+            b2_filename = "%s.b2" % current_filename
+            with open(b2_filename, 'w') as b2_file:
+                b2_file.write(hexdigest)
     else:
         explain("*** FAIL ***", compat)
         return 1