1 files changed, 49 insertions, 0 deletions

diff --git a/src/mailman_pgp/utils/pgp.py b/src/mailman_pgp/utils/pgp.py
new file mode 100644
index 0000000..7b2f958
--- /dev/null
+++ b/src/mailman_pgp/utils/pgp.py
@@ -0,0 +1,49 @@
+# Copyright (C) 2017 Jan Jancar
+#
+# This file is a part of the Mailman PGP plugin.
+#
+# This program is free software; you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with
+# this program.  If not, see <http://www.gnu.org/licenses/>.
+
+"""Miscellaneous PGP utilities."""
+from public import public
+
+
+@public
+def verifies(verifications):
+    """
+
+    :param verifications:
+    :type verifications: Sequence[pgpy.types.SignatureVerification]
+    :return: bool
+    """
+    return all(bool(verification) and
+               all(not sigsubj.signature.is_expired
+                   for sigsubj in verification.good_signatures) for
+               verification in verifications)
+
+
+@public
+def hashes(verifications):
+    """
+
+    :param verifications:
+    :return:
+    :rtype: Generator[str]
+    """
+    for verification in verifications:
+        for sigsubj in verification.good_signatures:
+            data = sigsubj.signature.hashdata(sigsubj.subject)
+            hasher = sigsubj.signature.hash_algorithm.hasher
+            hasher.update(data)
+            yield hasher.digest()