LPC55S69 UDS Key Provisioning Problems

awseiger — Thu, 04 Feb 2021 21:31:46 GMT

I am provisioning my PFR keystore as follows:

$BLHOST_COMMAND key-provisioning enroll $BLHOST_COMMAND key-provisioning set_key 12 32 #UDS Code $BLHOST_COMMAND key-provisioning set_user_key 3 "$SBKEK_REVERSED" #SBKEK for SB2p1 Images $BLHOST_COMMAND key-provisioning set_user_key 11 "$USERKEK_REVERSED" #USERKEK for SB2p1 Images $BLHOST_COMMAND key-provisioning set_key 7 16 #PRINCE region 0 Key $BLHOST_COMMAND key-provisioning set_key 8 16 #PRINCE region 1 Key $BLHOST_COMMAND key-provisioning set_key 9 16 #PRINCE region 2 Key $BLHOST_COMMAND key-provisioning write_key_nonvolatile 0 #Commit keys to PFR

This seems to work for the SBKEK, USERKEK, and PRINCE keys. However, when I go to load the UDS code, it appears that it has an index of "15" and is therefore sent to the AHB.

Upon re-construction of the UDS code, I get all zeros. What am I doing wrong?

Re: LPC55S69 UDS Key Provisioning Problems

diego_charles — Thu, 11 Feb 2021 21:28:20 GMT

Hi @awseiger

I hope you are doing well! According your results after reconstructing the UDS , it could be the case that the PUF is blocking the output of key data (see 2.11 PUF DisableSetKey from AN12324).

To narrow down this: Could you try to use the elftosb gui to provision the Key ?

Download link:

https://www.nxp.com/webapp/Download?colCode=elftosb_gui_1.0.12&appType=license&location=null

My apologies for the delay,

Best regards,

Diego

topic Re: LPC55S69 UDS Key Provisioning Problems in LPC Microcontrollers

LPC55S69 UDS Key Provisioning Problems

Re: LPC55S69 UDS Key Provisioning Problems