[feat] Use cryptography instead of pycryptopp to reduce dependencies.

* Resolves: #7889

2 files changed, 6 insertions, 4 deletions

diff --git a/mail/src/leap/mail/adaptors/soledad.py b/mail/src/leap/mail/adaptors/soledad.py
index 7f2b1cf..f4af020 100644
--- a/mail/src/leap/mail/adaptors/soledad.py
+++ b/mail/src/leap/mail/adaptors/soledad.py
@@ -22,7 +22,6 @@ import re
 from collections import defaultdict
 from email import message_from_string
 
-from pycryptopp.hash import sha256
 from twisted.internet import defer
 from twisted.python import log
 from zope.interface import implements
@@ -1208,7 +1207,7 @@ def _split_into_parts(raw):
 def _parse_msg(raw):
     msg = message_from_string(raw)
     parts = walk.get_parts(msg)
-    chash = sha256.SHA256(raw).hexdigest()
+    chash = walk.get_hash(raw)
     multi = msg.is_multipart()
     return msg, parts, chash, multi
 
diff --git a/mail/src/leap/mail/walk.py b/mail/src/leap/mail/walk.py
index 7be1bb8..8693bdd 100644
--- a/mail/src/leap/mail/walk.py
+++ b/mail/src/leap/mail/walk.py
@@ -17,13 +17,16 @@
 """
 Utilities for walking along a message tree.
 """
-from pycryptopp.hash import sha256
+from cryptography.hazmat.backends import default_backend
+from cryptography.hazmat.primitives import hashes
 
 from leap.mail.utils import first
 
 
 def get_hash(s):
-    return sha256.SHA256(s).hexdigest()
+    digest = hashes.Hash(hashes.SHA256(), default_backend())
+    digest.update(s)
+    return digest.finalize().encode("hex").upper()
 
 
 """