Utilize efficiency improvements to ThresholdMessageKit that ensures that Ciphertext is not needlessly copied between python layer and Rust later.

Allow ciphertext header to be directly obtained without needing to first get the Ciphertext.
Move decryption of ferveo encrypted data into a method on ThresholdMessageKit so that the Ciphertext data can be used directly in Rust layer, and not pulled into python to then pass
it back into the Rust layer for decryption.

nucypher/characters/lawful.py

@@ -57,7 +57,6 @@ from nucypher_core.ferveo import (
     Validator,
     combine_decryption_shares_precomputed,
     combine_decryption_shares_simple,
-    decrypt_with_shared_secret,
 )
 from nucypher_core.umbral import (
     PublicKey,
@@ -638,7 +637,7 @@ class Bob(Character):
         decryption_request = ThresholdDecryptionRequest(
             ritual_id=ritual_id,
             variant=variant,
-            ciphertext_header=threshold_message_kit.ciphertext.header,
+            ciphertext_header=threshold_message_kit.ciphertext_header,
             acp=threshold_message_kit.acp,
             context=context,
         )
@@ -775,13 +774,8 @@ class Bob(Character):
             shared_secret = combine_decryption_shares_simple(shares)
         else:
             raise ValueError(f"Invalid variant: {variant}.")
-        aad = threshold_message_kit.acp.aad()
-        cleartext = decrypt_with_shared_secret(
-            threshold_message_kit.ciphertext,
-            aad,  # aad
-            shared_secret,
-        )
 
+        cleartext = threshold_message_kit.decrypt_with_shared_secret(shared_secret)
         return cleartext
 
 

requirements.txt

@@ -55,7 +55,7 @@ msgpack==1.0.5
 msgpack-python==0.5.6
 multidict==5.2.0 ; python_version >= '3.6'
 mypy-extensions==0.4.4 ; python_version >= '2.7'
-nucypher-core @ git+https://github.com/derekpierre/nucypher-core.git@e8602c63d645a2643de5b25fa95eb408d259440e#subdirectory=nucypher-core-python
+nucypher-core @ git+https://github.com/derekpierre/nucypher-core.git@5ed307f57ad6e0c02ae065baac494a4028f8f729#subdirectory=nucypher-core-python
 packaging==23.1 ; python_version >= '3.7'
 parsimonious==0.9.0
 pendulum==3.0.0a1 ; python_version >= '3.7' and python_version < '4.0'

tests/integration/config/test_keystore_integration.py

@@ -194,7 +194,7 @@ def test_ritualist(temp_dir_path, testerchain, dkg_public_key):
     decryption_request = ThresholdDecryptionRequest(
         ritual_id=ritual_id,
         variant=FerveoVariant.Simple,
-        ciphertext_header=threshold_message_kit.ciphertext.header,
+        ciphertext_header=threshold_message_kit.ciphertext_header,
         acp=threshold_message_kit.acp,
     )