[Wallet/Mint] DLEQ proofs (#175)

* produce dleq

* start working on verification

* wip dleq

* Use C_ instead of C in verify DLEQ! (#176)

* Fix comments (DLEQ sign error)
* Fix alice_verify_dleq in d_dhke.py
* Fix_generate_promise in ledger.py
* Fix verify_proofs_dleq in wallet.py

* Fix: invalid public key (#182)

* Use C_ instead of C in verify DLEQ!

* Fix comments (DLEQ sign error)
* Fix alice_verify_dleq in d_dhke.py
* Fix_generate_promise in ledger.py
* Fix verify_proofs_dleq in wallet.py

* Fix: invalid public key

* Exception: Mint Error: invalid public key

* Update cashu/wallet/wallet.py

---------

Co-authored-by: calle <93376500+callebtc@users.noreply.github.com>

* Update cashu/core/b_dhke.py

* Update tests/test_cli.py

* verify all constructed proofs

* dleq upon receive

* serialize without dleq

* all tests passing

* make format

* remove print

* remove debug

* option to send with dleq

* add tests

* fix test

* deterministic p in step2_dleq and fix mypy error for hash_to_curve

* test crypto/hash_e and crypto/step2_bob_dleq

* rename A to K in b_dhke.py and test_alice_verify_dleq

* rename tests

* make format

* store dleq in mint db (and readd balance view)

* remove `r` from dleq in tests

* add pending output

* make format

* works with pre-dleq mints

* fix comments

* make format

* fix some tests

* fix last test

* test serialize dleq fix

* flake

* flake

* keyset.id must be str

* fix test decorators

* start removing the duplicate fields from the dleq

* format

* remove print

* cleanup

* add type anotations to dleq functions

* remove unnecessary fields from BlindedSignature

* tests not working yet

* spelling mistakes

* spelling mistakes

* fix more spelling mistakes

* revert to normal

* add comments

* bdhke: generalize hash_e

* remove P2PKSecret changes

* revert tests for P2PKSecret

* revert tests

* revert test fully

* revert p2pksecret changes

* refactor proof invalidation

* store dleq proofs in wallet db

* make mypy happy

---------

Co-authored-by: moonsettler <moonsettler@protonmail.com>

cashu/mint/ledger.py

@@ -7,6 +7,7 @@ from loguru import logger
 
 from ..core import bolt11
 from ..core.base import (
+    DLEQ,
     BlindedMessage,
     BlindedSignature,
     Invoice,
@@ -117,8 +118,7 @@ class Ledger:
                 logger.trace(f"crud: stored new keyset {keyset.id}.")
 
         # store the new keyset in the current keysets
-        if keyset.id:
-            self.keysets.keysets[keyset.id] = keyset
+        self.keysets.keysets[keyset.id] = keyset
         logger.debug(f"Loaded keyset {keyset.id}.")
         return keyset
 
@@ -188,17 +188,24 @@ class Ledger:
         keyset = keyset if keyset else self.keyset
         logger.trace(f"Generating promise with keyset {keyset.id}.")
         private_key_amount = keyset.private_keys[amount]
-        C_ = b_dhke.step2_bob(B_, private_key_amount)
+        C_, e, s = b_dhke.step2_bob(B_, private_key_amount)
         logger.trace(f"crud: _generate_promise storing promise for {amount}")
         await self.crud.store_promise(
             amount=amount,
             B_=B_.serialize().hex(),
             C_=C_.serialize().hex(),
-            id=keyset.id,
+            e=e.serialize(),
+            s=s.serialize(),
             db=self.db,
+            id=keyset.id,
         )
         logger.trace(f"crud: _generate_promise stored promise for {amount}")
-        return BlindedSignature(id=keyset.id, amount=amount, C_=C_.serialize().hex())
+        return BlindedSignature(
+            id=keyset.id,
+            amount=amount,
+            C_=C_.serialize().hex(),
+            dleq=DLEQ(e=e.serialize(), s=s.serialize()),
+        )
 
     def _check_spendable(self, proof: Proof):
         """Checks whether the proof was already spent."""