otp-ascii

#!/bin/bash

# Name: otp-ascii, Version: 1.3.1
# Discription: One-time Pad ASCII Printable Characters.
# Author: Nikolas Britton
#     E-mail: ytvzwld.mcteezy@rxltw.nzx (caesar, 11)
# Copyright 2021 Nikolas Britton, Apache 2.0 License
# Notes: Imagemagick is a dependency.

test -x /usr/local/bin/convert || {
    echo "Imagemagick's convert utility is a dependency, please install it first.";
    exit 1;
}

timestamp=$(date +%s);

function horizontal-legend () {
    printf 'ab#';
    for ((index_ab=33;index_ab<127;index_ab++)) do
        printf "\\$(printf %03o "${index_ab}")";
    done;
    echo;

    printf 'cd#';
    for ((index_cd=126;index_cd>32;index_cd--)) do
        printf "\\$(printf %03o "${index_cd}")";
    done;
    echo;
}

function otp-ascii () {
    horizontal-legend;

    printf '#%.0s' {1..97};
    echo;

    for ((index_ac=33,index_bd=126,switch=0;index_ac<127;index_ac++,index_bd--)) do
 	printf "\\$(printf %03o "${index_ac}")";
	printf "\\$(printf %03o "${index_bd}")";
        printf '#';
        LC_CTYPE=C < /dev/urandom tr -cd [:graph:] | tr -d '\n' | fold -w 94 | head -n 1;
    done;
}

echo > otp-ascii-${timestamp}.txt;

for k in $(seq -w 0 20); do
    printf "KEY$k " >> otp-ascii-${timestamp}.txt;
    LC_CTYPE=C < /dev/urandom tr -cd [:graph:] | tr -d '\n' | fold -w 94 | head -n 1 | sed -e 's/\(.\)/\1 /g' >> otp-ascii-${timestamp}.txt;
done;

printf "SHA01 " >> otp-ascii-${timestamp}.txt;
shasum -a 512256 otp-ascii-${timestamp}.txt >> otp-ascii-${timestamp}.txt;

otp-ascii | sed -e 's/\(.\)/\1 /g' >> otp-ascii-${timestamp}.txt;
printf "SHA02 " >> otp-ascii-${timestamp}.txt;
shasum -a 512256 otp-ascii-${timestamp}.txt >> otp-ascii-${timestamp}.txt;

convert -density 600 -units pixelsperinch -size 12000x12000 xc:white -font "Monaco" -pointsize 8 -fill black -annotate +15+15 "@otp-ascii-${timestamp}.txt" -trim +repage otp-ascii-${timestamp}.png;

#rm otp-ascii-${timestamp}.txt;