Our Online Store have the new products: RFID antenna board. Currently it can work with JC10M24R and JCOP4 card chips.
Compared with normal cards, the antenna board module has a smaller size and fixed holes, which is easy to integrate in the IOT(Internet Of Things) project.

Search found 5 matches

by listade
Fri Sep 14, 2018 7:01 am
Forum: Algorithm School
Topic: Problem with ECC
Replies: 5
Views: 24977

Re: Problem with ECC

All right, I solved problem.
by listade
Fri Sep 14, 2018 4:06 am
Forum: Algorithm School
Topic: ECDSA signature
Replies: 5
Views: 27420

Re: ECDSA signature

I have same problem with SECP_256k1. :(
by listade
Fri Sep 14, 2018 3:03 am
Forum: Algorithm School
Topic: Problem with ECC
Replies: 5
Views: 24977

Re: Problem with ECC

Okey, I coped with setW, the first byte must be 0x04.


But, JavaCard signature doesn't valid for https://www.javacardos.com/tools/ecdsa_sign_verify.html
Why?
by listade
Thu Sep 13, 2018 3:24 am
Forum: Algorithm School
Topic: Problem with ECC
Replies: 5
Views: 24977

Re: Problem with ECC

OK, I understood, its TLV format. But I still have question about public key. JavaCard returns me "wrong data" for any tries setW() to ECDSA publicKey object. How to do this? What`s the format?
by listade
Wed Sep 12, 2018 4:56 am
Forum: Algorithm School
Topic: Problem with ECC
Replies: 5
Views: 24977

Problem with ECC

Hi, guys. I have written some code for signing messages by ECDSA algorithm. But JavaCard returns me every time different values with different sizes. For example: 30450221008443B0B08EACBF7B4F718AF441154CE79391AC2206715A13950DBDF65E2004A2022041C8086F556D4BD4F5B0B87412A3982F75C12447901886BE01F0EBC44C9...
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