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Adding symbols to an ELF file doesn't solve the problem we're trying
to solve. We want to be able to identify which application is running
on a board when we don't know what ELF file has been loaded in flash.
A checksum over the contens of the flash memory seems less dumb.
This reverts commit 49d39287252bf0bd2b3fd75e86d07616b56c7fd2.
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- 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
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Keep indentation level 2 in main.c to minimise changes.
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That's too destructive (and also it doesn't work well with .~/).
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