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I'm trying to generate the preshared secret with output in the clear using an internal private key and an external public key to get it but the ecdh function returns ATCA_EXECUTION_ERROR.
Private key is stored in slot 0 with the following configs:
SlotConfig 0x00 0x87
KeyConfig 0x00 0x13
Every zone is locked except OTP.
The call is pretty simple and looks like this: ret = atcab_ecdh(0, public_key, pms);
Anyway, I could use the key for ECDSA signing and worked well.
Do you have any idea what the problem could be?