nrf8240 Signature validation failed during testing

Question

Hi , 
 
 i am using nrf52840 dk board. and using 17.1 sdk for examples code. 
 i am trying to customize open bootloader code and trying to validate the signature of a input data by using nrf_dfu_validation_signature_check() API. 
 Note: - i am having my own public and signature data, which i fed to this function. 
 But i am getting "NRF_DFU_RES_CODE_INVALID_OBJECT" in return from the above API. 
 Below i attcahed the calling function with input parameters. 
 
 static uint8_t m_message[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; const size_t m_message_len = 36; // Skipping null termination 
 
 Regards

Einar Thorsrud · Accepted Answer

Hi, 
 No, these sets of commands are not OK. The specific problem is that the bootloader start address is stored in the UICR, and that is part of the bootloader hex file. When you later program the application with the "--sectoranduicrerase" option, the UICR is deleted again. In this specific case it would be enough to just skip "--sectoranduicrerase" from step 5, but as you start with an erase all there is no need to use this anywhere, so I suggest you remove this option from all the commands.

nrf8240 Signature validation failed during testing

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