Add preferred hash algorithm signature subpacket parsing to PGPPacket

From RFC 4880 [1]:

  (array of one-octet values)

  Message digest algorithm numbers that indicate which algorithms the
  key holder prefers to receive.  Like the preferred symmetric
  algorithms, the list is ordered.  Algorithm numbers are in Section
  9.  This is only found on a self-signature.

[1]: http://tools.ietf.org/search/rfc4880#section-5.2.3.8

diff --git a/gpg-migrate.py b/gpg-migrate.py
index a1dbb7abb2aea919a34e0d52e1e96a7b1cf5eea5..782fa4e63d0a3c344489129108f9d2a3a4fee754 100755 (executable)
--- a/gpg-migrate.py
+++ b/gpg-migrate.py
@@ -297,6 +297,11 @@ class PGPPacket (dict):
         return ', '.join(
             algo for algo in subpacket['preferred-symmetric-algorithms'])
 
+    def _str_preferred_hash_algorithms_signature_subpacket(
+            self, subpacket):
+        return ', '.join(
+            algo for algo in subpacket['preferred-hash-algorithms'])
+
     def _str_key_flags_signature_subpacket(self, subpacket):
         return ', '.join(x for x in sorted(subpacket['key-flags']))
 
@@ -561,6 +566,11 @@ class PGPPacket (dict):
         subpacket['preferred-symmetric-algorithms'] = [
             self._symmetric_key_algorithms[d] for d in data]
 
+    def _parse_preferred_hash_algorithms_signature_subpacket(
+            self, data, subpacket):
+        subpacket['preferred-hash-algorithms'] = [
+            self._hash_algorithms[d] for d in data]
+
     def _parse_key_flags_signature_subpacket(self, data, subpacket):
         subpacket['key-flags'] = set()
         if data[0] & 0x1: