7.1.1 at91bootstrap .yaml File Format

The cust_CMAC.yaml file must contain a customer key in hexadecimal format as follows:
chip_type: sam9x70
image_type: secure
security:
  signature:
    type: CMAC_AES
    key_data: data:0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef
  cipher: 
    type: AES
    key_data: data:0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef
    iv_data: data:0123456789abcdef0123456789abcdef