hello I work on the crypto part of the cortina/gemini SL3516 SoC. The datasheet mention a HWRNG in its IP but really briefly: """ The implementation is a 32-bit Hardware Random Number Generator that has a uniformed distribution between 0 and 2^32 -1. The hardware randomness is created by sampling data from different clock domains, and feeding it as input to the 32-bit maximum length LFSR (Linear Feedback Shift Register) """ Piping its output to rngtest give: dd if=/dev/hwrng count=2000 bs=2048 | rngtest rngtest 6.11 rngtest: starting FIPS tests... rngtest: entropy source drained rngtest: bits received from input: 32768000 rngtest: FIPS 140-2 successes: 1191 rngtest: FIPS 140-2 failures: 447 rngtest: FIPS 140-2(2001-10-10) Monobit: 183 rngtest: FIPS 140-2(2001-10-10) Poker: 116 rngtest: FIPS 140-2(2001-10-10) Runs: 346 2000+0 records in 2000+0 records out rngtest: FIPS 140-2(2001-10-10) Long run: 0 rngtest: FIPS 140-2(2001-10-10) Continuous run: 0 rngtest: input channel speed: (min=303.606; avg=3143.352; max=9712.208)Kibits/s rngtest: FIPS tests speed: (min=7.104; avg=10.332; max=10.638)Mibits/s rngtest: Program run time: 13303224 microseconds That's a quite number of failure. Can the hwrng still be used with some "hwrng->quality" setting ? Or it is just too many failure to be used ? Regards
