gpg: allow parsing multiple keys

trezor_agent/gpg/decode.py

@@ -286,15 +286,13 @@ def collect_packets(packets, types_to_collect):
     return result
 
 
-def parse_public_key(stream):
+def parse_public_keys(stream):
     """Parse GPG public key into hierarchy of packets."""
     packets = list(parse_packets(stream))
     packets = collect_packets(packets, {'signature'})
     packets = collect_packets(packets, {'user_id', 'user_attribute'})
     packets = collect_packets(packets, {'subkey'})
-    if len(packets) != 1:
-        raise ValueError('Unexpected packet structure: %r', packets)
-    return packets[0]
+    return packets
 
 
 HASH_ALGORITHMS = {

trezor_agent/gpg/tests/test_decode.py

@@ -111,4 +111,5 @@ def public_key_path(request):
 
 def test_gpg_files(public_key_path):  # pylint: disable=redefined-outer-name
     with open(public_key_path, 'rb') as f:
-        decode.parse_public_key(f)
+        keys = decode.parse_public_keys(f)
+        assert len(keys) > 0