ATECC DH instruction

This command asks the SpringCore device to run the ECDH algorithm, using its ATECC Secure Element.

Field Value Remark
CLA FF
INS F9
P1 E8 ECDH agreement
P2 Key Index 00 to 0D
Lc 20 or 40 DataIn is the public key of the peer, either X only (32 bytes) or X followed by Y (64 bytes)
DataIn Peer's public key X on 32 bytes
Y on 32 bytes (optional)
Le 00

Response

Field Value Remark
DataOut Shared secret 32 bytes
SW 9000 on success Other values are documented in Status Words