- fingerprints += [sig.fpr]
- return (plaintext, fingerprints)
+ if (sig.summary == 0) or (sig.summary & gpgme.SIGSUM_VALID != 0) or (sig.summary & gpgme.SIGSUM_GREEN != 0):
+ try:
+ key_obj = gpgme_ctx.get_key(sig.fpr)
+ except:
+ if fingerprints == []:
+ sigkey_missing = True
+ continue
+
+ if is_key_usable(key_obj):
+ fingerprints += [sig.fpr]
+ key_cannot_encrypt = False
+ sigkey_missing = False
+
+ elif fingerprints == []:
+ key_cannot_encrypt = True
+
+ elif fingerprints == []:
+ if (sig.summary & gpgme.SIGSUM_KEY_MISSING != 0):
+ sigkey_missing = True
+
+ return (fingerprints, sigkey_missing, key_cannot_encrypt)
+
+
+def is_key_usable (key_obj):
+ """Returns boolean representing key usability regarding encryption
+
+ Tests various feature of key and returns usability
+
+ Args:
+ key_obj: a gpgme key object