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2020-01-21[cc20rng] Revamping the ChaCha20 seedingLinus Nordberg
- chacha20_prng_block() uses counter in the state struct - chacha20_setup() replaces chacha20_prng_reseed() and fills the whole state struct, fixing a bug where only half of the key was being set; as a result of 'counter' being set, a state struct filled with entropy from the TRNG makes reseeding occur after a random number of rounds instead of after a fixed 2^32-1 rounds - decrementing of the block counter is done in chacha20_prng_block() - chacha output is copied to buf _after_ the interrupt driven transmission of buf to UART has finished, to stop the race between reading and refilling of buf
2020-01-21[cc20rng] Code formatting changesLinus Nordberg
Keep indentation level 2 in main.c to minimise changes.
2019-12-16Make local functions staticLinus Nordberg
2016-11-21add RNG using ChaCha20 as CSPRNGFredrik Thulin