Hi,
We are developing a board using the CLRC663 frontend. We have successfully communicated with an EV3 card. We have completed the anti-collision process, authenticated (2k3DES encryption with zero key), created an application and created a file successfully. We are confident that our 2k3DES encryption/decryption is working correctly.
We are having problems writing to the file. We can write to a file in plain text mode, but we keep getting a response of 0x1E (integrity error) when we try to write to a file in encrypted mode.
This is a brand new card (all keys are zero), we are using 2k3DES encryption to encrypt our message. We're not sure if the message needs a CRC, or if it should be CRC16 or CRC32. We're also not sure if the encryption has to have the IV set to something other than zero, over what range the CRC is calculated, we are not sure we have calculated the session key correctly etc. There are too many combinations to try.
Is there a document that explains this process in more detail ? We have only got to where we are by scouring the internet and trial and error.
We have recently signed the NXP NDA so I believe we are now authorized to receive this data.
I would appreciate your help with this.
Thanks
