8bits signed integer

[Brian_Candler]

You only need to do the modulo-256 once at the end.

test =
"\x75\x63\x32\x21\x01\xA9\x94\x94\x94\x94\x94\x94\x94\x94\x94\x0a\x85"

puts (test.bytes.inject(:+) % 256).to_s(16)
#=> 98

···

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