Don't require --publickey, but print better error message.

2 files changed, 7 insertions, 2 deletions

diff --git a/tools/certtools.py b/tools/certtools.py
index 405aabd..ccbc76e 100644
--- a/tools/certtools.py
+++ b/tools/certtools.py
@@ -219,7 +219,12 @@ def encode_signature(hash_alg, signature_alg, unpacked_signature):
 
 def check_signature(baseurl, signature, data, publickey=None):
     if publickey == None:
-        publickey = base64.decodestring(publickeys[baseurl])
+        if baseurl in publickeys:
+            publickey = base64.decodestring(publickeys[baseurl])
+        else:
+            print >>sys.stderr, "Public key for", baseurl, \
+                "not found, specify key file with --publickey"
+            sys.exit(1)
     (hash_alg, signature_alg, unpacked_signature) = decode_signature(signature)
     assert hash_alg == 4, \
         "hash_alg is %d, expected 4" % (hash_alg,) # sha256
diff --git a/tools/check-sth.py b/tools/check-sth.py
index 0cdc031..dacd8e6 100755
--- a/tools/check-sth.py
+++ b/tools/check-sth.py
@@ -26,8 +26,8 @@ parser.add_argument('--cur-sth',
                     metavar='file',
                     default=DEFAULT_CUR_FILE,
                     help="File containing current STH (default=%s)" % DEFAULT_CUR_FILE)
-parser.add_argument('publickey', help='File containing the public key for the CT log')
 parser.add_argument('baseurl', help="Base URL for CT log")
+parser.add_argument('--publickey', default=None, metavar='file', help='Public key for the CT log')
 parser.add_argument('--cafile', default=None, metavar='file', help='File containing the CA cert')
 parser.add_argument('--allow-lag', action='store_true', help='Allow node to lag behind previous STH')
 parser.add_argument('--quiet-ok', action='store_true', help="Don't print status if OK")