for utils in argon2 xxd bc; do if ! command -v $utils &> /dev/null; then echo "$utils is not installed. Please install it and try again." exit 1 fi done

if [ $# -lt 1 ]; then read -p "Enter Challenge Code: " challenge else challenge=$1 fi

challenge=$(echo "$challenge" | xargs)

IFS=':' read -r _ memory_cost time_cost salt difficulty <<< "$challenge"

memory_cost=$(echo "$memory_cost" | xargs) time_cost=$(echo "$time_cost" | xargs) difficulty=$(echo "$difficulty" | xargs)

pw_prefix="UNBLOCK-$(head /dev/urandom | tr -dc A-Z0-9 | head -c 8)-" difficulty_raw=$(echo "scale=10; e(l(256) * (4 - l($difficulty) / l(256))) / 1" | bc -l | xargs printf %.0f)

echo "Estimated iterations: $difficulty" echo "Time Cost: $time_cost" echo

n=1

start_time=$(date +%s)

elapsed_time() { current_time=$(date +%s) elapsed_time=$((current_time - start_time)) echo -ne "\rElapsed Time: $elapsed_time seconds." }

while true; do pw="$pw_prefix$n" hash=$(echo -n "$pw" | argon2 "$salt" -t "$time_cost" -k "$memory_cost" -p 1 -id -v 13 -r) hash_bytes=${hash:0:8}

if [ $((16#$hash_bytes)) -lt "$difficulty_raw" ]; then
    echo
    echo "SOLUTION FOUND"
    echo "Your unblock code is: $pw"
    echo "This is the code you enter into the site to pass the challenge."
    echo
    break
else
    elapsed_time
    n=$((n + 1)) 
fi

done