How can I calculate X co-ordinate from a given Y co-ordinate or vice versa from a public EC key in nrf5340dk

RE: How can I calculate X co-ordinate from a given Y co-ordinate or vice versa from a public EC key in nrf5340dk

Utkarsh — Tue, 22 Oct 2024 06:36:31 GMT

requesting help in this

RE: How can I calculate X co-ordinate from a given Y co-ordinate or vice versa from a public EC key in nrf5340dk

Utkarsh — Tue, 15 Oct 2024 10:51:00 GMT

Apologies, I should have worded it better.

How do I decompress a public key which I have received in compressed form.

RE: How can I calculate X co-ordinate from a given Y co-ordinate or vice versa from a public EC key in nrf5340dk

tesc — Mon, 14 Oct 2024 14:56:30 GMT

Hi,

What you ask for does not quite make sense. What is the overall task you intend to perform, can you provide a bit more context?

For instance, we have a sample in the SDK performing Elliptic-curve Diffie-Hellman key exchange. Calculations revolving around keys, points, etc. on the elliptic curve are part of what is performed under-the-hood when cryptography APIs are used, but there should be no need to perform individual sub-steps of those algorithms manually.

Regards,
Terje