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fix: feed full SE hash into ngu.random.reseed #697

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fix: feed full SE hash into ngu.random.reseed #697

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10 changes: 5 additions & 5 deletions shared/mk4.py
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Original file line number Diff line number Diff line change
Expand Up @@ -38,15 +38,15 @@ def make_psram_fs():

def rng_seeding():
# seed our RNG with entropy from secure elements
import callgate, ngu, ustruct
import callgate, ngu

a = callgate.read_rng(1) # SE1
b = callgate.read_rng(2) # SE2

n = ngu.hash.sha256d(a+b)
n, = ustruct.unpack('I', n[0:4])

ngu.random.reseed(n)
# Pass full sha256d digest. Truncating to 32 bits left most SE entropy
# on the floor and libngu reseed(int) only overwrote one yasmarang word.
# Requires libngu reseed(bytes) support (switck/libngu#65).
ngu.random.reseed(ngu.hash.sha256d(a+b))


def init0():
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