Use pysequoia for decryption

GnuPG/__init__.py

@@ -197,8 +197,11 @@ class GPGDecryptor:
     def decrypt(self):
         """Decrypt the message."""
         p = subprocess.Popen(self._command(), stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
-        decdata = p.communicate(input=self._message)[0]
-        return (decdata, p.returncode)
+        try:
+            decrypted = pysequoia.decrypt(bytes = self._message)
+            return (decrypted.bytes.decode("utf8"), 0)
+        except:
+            return ("", 1)
 
     def _command(self):
         return _build_command(self._keyhome, "--trust-model", "always", "--batch", "--yes", "--no-secmem-warning", "-a", "-d")