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This commit changes the way random numbers are available with MySensors. The AVR platform uses a 32 Bit random seed build from a floating analog pin. The way of the generation of this seed is FIPS 140-2 compliant. For support MCU with a fast way to generate random data, the hwGetentropy() command is now available to allow rapid generation of random data. The ESP8266 platform uses the internal random source for randomness for hwGetentropy() and Arduino's random() function. The NRF5 platform initializes the pseudo random number generator from internal hardware number generator. The internal AES-ECB unit generates random data after filling with HWRNG data by AES-CBC. On Linux getrandom() is implemented via syscall(). signerAtsha204SoftGetNonce speed: AVR = ~14000us (sha204Soft) NRF51 = ~152us (AES-CBC), 1739us (old sha204Soft) NRF52 = ~31us (AES-CBC), 183us (old sha204Soft) ESP8266 = ~20us (RANDOM_REG32), 380us (old sha204Soft) All Nonce results tested for FIPS 140-2 compliance successfully.
MySensors Library v2.2.0-beta
Please visit www.mysensors.org for more information
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