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Using QorIQ family processor Security Engine 4.2 as entropy source

Question asked by Mofassir Haque on Jul 27, 2016

I want to improve entropy by using the output of TRNG i.e. hardware generated entropy. I have pointed the "rng_current" to "rng-caam". I am running "rngd" with r option i.e.  "rngd -r /dev/hwrng". Trace program i.e. "strace rngd -r /dev/hwrng" confirms that it is reading/getting 8 bytes.


However, I want to confirm that whether I am getting entropy output from SEC 4.2 RNG (which is available across RNG Test Output FIFO register) or output is coming from SEC 4.2 TRNG (which is available across XKEY register) ?


Any help/reply is appreciated please.


Thanks & Regards,