how to create a RSA key for dfu ?

Question

Hello, 
 Add DFU support to your application - Software - nRF Connect SDK guides - Nordic DevZone (nordicsemi.com) 
 
 -----BEGIN RSA PRIVATE KEY----- .................................................. -----END RSA PRIVATE KEY-----

how to create a RSA key for dfu ? any tools? 
 
 PS: use key from 6011.child_image.zip link( mcuboot with custom key - Nordic Q&A - Nordic DevZone - Nordic DevZone (nordicsemi.com) ) can dfu OTA, 
 but create another key from nrf\samples\crypto\rsa or some online tools ,will can't start app.

Best Regards

Hung Bui · Accepted Answer

It's the click package that you need to installed in python3. 
 Please make sure you only have python 3 installed , not python 2.7. Please try these and let me know the log on each command: 
 pip3 freeze 
 python --version 
 python imgtool . py keygen - k file . pem - t rsa - 2048

how to create a RSA key for dfu ?

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