collect-entropy.zsh

collect-entropy () {
	zmodload zsh/mathfunc
	local wordlist=($(grep -P '^[aoeuidhtns]{3,}$' /usr/share/dict/words)) 
	local length=${#wordlist[@]} 
	local min=$(( 65536 % $length )) 
	local wordcount=$(( int(ceil(512/log2($length))) )) 
	local words=() 
	for ((i=1; i<=${wordcount}; i++ )) do
		local rand=$(( 0x$(xxd -ps -l 2 /dev/urandom) )) 
		until [[ $rand -ge $min ]]
		do
			rand=$(( 0x$(xxd -ps -l 2 /dev/urandom) )) 
		done
		words+=(${wordlist[$(( ($rand % $length) + 1 ))]}) 
	done
	printf "Type, not copy/paste these ${wordcount} words in the event tester window.\n"
	printf "Move your mouse a bit in the event tester window afterward if desired.\n"
	printf "Close the event tester window when finished.\n"
	printf "\n"
	printf "$words\n" | fold -s
	local entropy=$(strace --timestamps=precision:ns xev 2>&1) 
	printf "\n\n"
	printf "Here is your entropy: "
	printf %s "${entropy}" | gzip -c | b2sum | awk '{print $1}'
}