dufkan / jced25519 Goto Github PK

The applet compiles and run in the JCIDE simulator. Initialization works well but when key generation is requested, the error F101 is received.

The code returns a cryptographic exception on the function setW on a ECPublic key

I tried with different javacard runtime (3.04, 3.05...) but the error remains:
(ILLEGAL VALUE)

The profile SIMULATOR is used, I tried changing some settings but error remain.

When the applet is loaded on a P71D600, it returns the same error.

Hello. As far as I can see there are no signature verification api in this applet. I'm exploring possibilities for using smartcard for multiparty authentication schemes and want to add public key authentication to some of the methods. I.e. smartcard will hold its own private key and separate trusted public key and there will be sign method that will check that request is signed by stored public key.

I'm not a cryptography expert and I've looked to signature verification in other implementations and I'm not sure I can port them over there with enough confidence. Can you help me with this?

Hi @dufkan,

I am planning to integrate your implementation into our project for signing Cardano transactions as a proof-of-concept while we await the arrival of chips supporting Javacard 3.1 in the market.

To accomplish this, I intend to use deterministic nonce generation, based on the transaction hash (32 bytes) and the private key.

Question 1) Does the security "WARNING" mentioned in the README also apply to the deterministic nonce generation, or is it related solely to the random generation process?

Question 2) How long does it typically take to sign 32 bytes with offloading disabled? I attempted to run tests with J3R180 using two different card readers, but I encountered the error "No card terminal found".

Question 3) Which card reader do you recommend using?

Thank you for your excellent work on this project!