convert text to keystrokes and send to a Virtualbox machine via VBoxManage (scuffed clipboard)

type.bash

#!/usr/bin/env bash
# requires bash 4+ (for associative arrays)

# description: convert text to keystrokes and send to a Virtualbox machine via VBoxManage 
#              (when guest additions are not an option, for adding ssh-keys and such, it is quite slow)

# usage: ./type $1 $2
# $1: virtual machine name
# $2: text to type

# example: ./type CoreOS "Hello World!"

declare -A keys
result=()

# Decimal scan codes for key down press
# ref: https://www.win.tue.nl/~aeb/linux/kbd/scancodes-1.html
keys=(
    ["1!"]=2
    ["2@"]=3
    ["3#"]=4
    ["4$"]=5
    ["5%"]=6
    ["6^"]=7
    ["7&"]=8
    ["8*"]=9
    ["9("]=10
    ["0)"]=11
    ["-_"]=12
    ["=+"]=13

    ["qQ"]=16
    ["wW"]=17
    ["eE"]=18
    ["rR"]=19
    ["tT"]=20
    ["yY"]=21
    ["uU"]=22
    ["iI"]=23
    ["oO"]=24
    ["pP"]=25
    ["[{"]=26
    ["]}"]=27

    ["aA"]=30
    ["sS"]=31
    ["dD"]=32
    ["fF"]=33
    ["gG"]=34
    ["hH"]=35
    ["jJ"]=36
    ["kK"]=37
    ["lL"]=38
    [";:"]=39
    ["'\""]=40

    ["zZ"]=44
    ["xX"]=45
    ["cC"]=46
    ["vV"]=47
    ["bB"]=48
    ["nN"]=49
    ["mM"]=50
    [",<"]=51
    [".>"]=52
    ["/?"]=53

    ["\`~"]=41
    ["\\|"]=43
    [" "]=57
)

vm="$1"
text="$2"

for ((i = 0; i < ${#text}; i++));
do

    letter="${text:$i:1}"

    for scancode in "${!keys[@]}";
    do
        if [[ $letter == "${scancode:0:1}" ]];
        then
            result+=( "${keys[$scancode]}" )

            result+=( "$((${keys[$scancode]} + 128))" )
        fi
        if [[ $letter == "${scancode:1:1}" ]];
        then
            # press shift
            result+=( "42" )

            result+=( "${keys[$scancode]}" )

            result+=( "$((${keys[$scancode]} + 128))" )

            # lift shift
            result+=( "170" )
        fi
    done
done

for decimal in "${result[@]}";
do
    hex_result="$(printf '%02x ' "$decimal")"
    VBoxManage controlvm $vm keyboardputscancode $hex_result
done