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309
Task/One-time-pad/TypeScript/one-time-pad.ts
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309
Task/One-time-pad/TypeScript/one-time-pad.ts
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#!/usr/bin/env node
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import { writeFileSync, existsSync, readFileSync, unlinkSync } from 'node:fs';
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//https://www.elitizon.com/2021/01-09-how-to-create-a-cli-command-with-typescript/#:~:text=%20Boost%20your%20productivity%20by%20creating%20your%20own,information.%20Required%3A%20string.%20%20...%20%20More%20
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const a:string[] = process.argv;
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const argv:string[] = a.splice(2)
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/**
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* Extension of the pad files
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*/
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const padExtension:string = ".1tp";
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/**
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* Extension of the key generated
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*/
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const keyExtension:string = ".key";
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/**
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* Array of commands usable
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*/
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const commands:string[] = ["--generate", "--encrypt","--decrypt"];
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/**
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* The alphabet
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*/
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const stringLetter = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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/**
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* Main function
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*/
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const main = ():void => {
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// if no args have been give display help
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if(argv.length == 0){
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help();
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return;
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}
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// Check if there is a command in the file
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if(commands.includes(argv[0])){
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let choise = argv[0].trim().toLowerCase();
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if(choise === "--generate"){
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console.log("Generating action chosen");
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// Check if the arguments have been given to generate a new key
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if(!argv[1]){
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("Pad name not specified")
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help();
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return;
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}
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// Check if the length of the filename is at least 4 characters
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if(argv[1].length <= 3){
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console.log("The name of the pad should be at least 4 letters long");
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help();
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return;
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}
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// Check if the filesize is a number(should be the second argv)
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let fileSize = +argv[2];
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if(isNaN(fileSize)){
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console.log("File size should be a number");
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help();
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return
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}
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createFile(argv[1], fileSize)
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}
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// If the selected action is to encrypt
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if( choise === "--encrypt"){
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console.log("Encrypting action chosen");
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let padDataName = argv[2] ? `${argv[2].trim()}${padExtension}` : `${argv[1].trim()}${padExtension}`
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// Check if the files exist
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if(!argv[1] && !argv[2]){
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console.log("Parameters not given");
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help();
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return;
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}
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// Check if the text file exists and the pad file
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if(!existsSync(`${argv[1].trim().toLowerCase()}.txt`)){
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console.log("Text file doesn't exit");
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help();
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return;
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}
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console.log("Reading file")
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// Get the data from the file as well as the data from the padfile
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let fileDataEnc = readFileSync(`${argv[1].trim().toLowerCase()}.txt`, 'utf-8');
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if(!existsSync(`${argv[2]}${padExtension}`)){
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console.log("1tp file doesn't exist, generating new 1pt file");
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createFile(argv[1], fileDataEnc.length);
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}
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console.log("Reading 1pt file");
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// Get the pad data
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let padDataEnc = RetrievePadData(padDataName);
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// if the file 1pt file has been specified but it's not big enough
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if(fileDataEnc.length > padDataEnc.length){
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console.log("The file is bigger than the 1tp file. Generating a new padfile");
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createFile(argv[1], fileDataEnc.length);
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padDataEnc = RetrievePadData(`${argv[1]}${padExtension}`)
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}
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console.log("Converting the file");
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let keyEnc = padFunction(fileDataEnc,padDataEnc);
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createFile(`${argv[1]}.key`, keyEnc.length, false, keyEnc);
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}
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if(choise === "--decrypt"){
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console.log("Decrypting action chosen");
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// Check if the necessary args were given
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if(!argv[1]){
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console.log("No file specified For decryption specified")
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return;
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}
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if(!argv[2]){
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console.log("No 1pt file was given, Please specify the file to use");
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return;
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}
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if(!argv[3] || argv[3].trim() != '-o') {
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console.log("No file for output specified");
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}
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let fileNameDec = `${argv[1].trim()}${keyExtension}`;
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let padNameDec = `${argv[2].trim()}${padExtension}`;
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// Check if the files exists or not
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if(!existsSync(fileNameDec)){
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console.log("File specified does not exist");
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return;
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}
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if(!existsSync(padNameDec)){
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console.log("1pt file specified doesn't exist");
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return;
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}
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console.log("Read the encrypted file");
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let fileDataDec = readFileSync(fileNameDec, 'utf-8');
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console.log("Reading the 1pt file");
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let padDataDec = RetrievePadData(padNameDec);
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// decrypt the file
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console.log("Generating the file");
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let keyDec = padFunction(fileDataDec, padDataDec)
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if(argv[3] && argv[3].trim()==='-o'){
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let textFileDec = `${argv[1].trim()}.txt`;
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if(!argv[4]){
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console.log("No output file specified, creating a new file")
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}
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if(argv[4] && argv[4].trim().length < 3){
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console.log("The name of the output file should be greater than 4 characters");
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console.log(`Creating new file`)
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}else {
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argv[4] ? textFileDec = `${argv[4].trim()}.txt` : textFileDec = `${argv[1].trim()}.txt`
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}
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console.log("Generating text file");
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createFile(textFileDec, 0, false, keyDec );
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// https://sebhastian.com/javascript-delete-file/
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console.log("Deleting encrypted file");
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unlinkSync(fileNameDec);
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console.log("Deleting 1pt file");
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unlinkSync(padNameDec);
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}else {
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console.log("The decrypted file is: \n\n")
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console.log(keyDec);
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}
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}
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}else {
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console.log("Invalid action");
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help();
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return;
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}
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}
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/**
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* Display help messages
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*/
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const help = ():void => {
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console.log("\n\n\n1tp is a tool used to encrypt and decrypt text files");
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console.log("Look at the commands below to learn the use of it");
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console.log("The input file for encryption should be a txt file");
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console.log("The output will be a .kye file and a .1pt file");
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console.log("\n\n**Note: Don't add file extensios while running the command**");
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console.log("**Note: if during creation, the application encouters a file already existing, it will overwrite the file**");
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console.log("Options: ");
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console.log("\t -h | --help \t\t\t\t\t\t\t View help");
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console.log("\t --generate <pad name> <size of file> \t\t\t\t Create a pad file given a size");
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console.log("\t --encrypt <txt file> <pad name> \t\t\t\t Encrypt a file give a pad file");
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console.log("\t\t\t\t All parameters for encryption are required");
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console.log("\t --decrypt <key file> <pad name> -o <txt file> \t Decrypt a file give a key and 1tp files");
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console.log("\t\t\t\t If output file is not specified it will display the text inside the console");
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console.log("\t\t\t\t If only the `-o` option is defined without a txt file, it will create a new file");
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console.log("\n** Note: Decrypting a file will delete the key and the 1pt files**");
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}
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/**
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* Create a file with a random key
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* @param file Name of the file being created
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* @param fileSize Size of the file being created
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*/
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const createFile = (file:string, fileSize:number = 1024, key:boolean = true, data:string = ""):void => {
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let fileName:string;
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if(key){
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fileName = `${file.trim().toLowerCase()}${padExtension}`;
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// https://flaviocopes.com/how-to-check-if-file-exists-node/#:~:text=The%20way%20to%20check%20if%20a%20file%20exists,the%20existence%20of%20a%20file%20without%20opening%20it%3A
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console.log("Generating the One time pad");
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const pad = generateOneTimePad(fileSize);
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//https://code-boxx.com/create-save-files-javascript/#:~:text=%20The%20possible%20ways%20to%20create%20and%20save,the%20server.%0Avar%20data%20%3D%20new%20FormData...%20More%20
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console.log("Writing to file");
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writeFileSync(fileName, pad);
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return;
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}
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console.log("Writing to file");
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writeFileSync(file, data);
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};
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/**
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* Generate a pad
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* @param fileSize Size of the new pad being created
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* @returns the new pad
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*/
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const generateOneTimePad = (fileSize:number):string => {
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/**
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* String in which we will put the one time pad
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*/
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let otp:string = "";
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/**
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* used to organize the key
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*/
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let splitCounter = 0;
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let columnCounter = 0;
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for (let i = 0; i <= fileSize;) {
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if(splitCounter < 6){
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// Generate a random letter from the alphabet given
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otp += (stringLetter.charAt(Math.random()*1000%stringLetter.length))
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splitCounter++;
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i++;
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continue;
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}
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// Used to organize the key so it looks estetic
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if(columnCounter < 7){
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splitCounter = 0;
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columnCounter++;
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otp += ("\t");
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continue;
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}else{
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splitCounter = 0;
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columnCounter = 0;
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otp += ("\n");
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continue;
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}
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}
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return otp
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}
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/**
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* Get the pad data from the file
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* @returns Text pad data
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*/
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const RetrievePadData = (padFile:string):string => {
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// Retrieve the pad data
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let padData = ""
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// read the file
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const data = readFileSync(`${padFile}`, 'utf-8')
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// Take out all the tabs and new lines we added while generating the key
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const stringArray = data.toString().split("\n");
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for (let index = 0; index < stringArray.length; index++) {
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const element = stringArray[index].split("\t");
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for (let i = 0; i < element.length; i++) {
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padData += element[i];
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}
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}
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return padData;
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}
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/**
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* One time pad function
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* @param fileData Data of the file to encrypt or decrypt
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* @param padData Data of the pad file
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* @returns The generated encryption or decryption
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*/
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const padFunction = (fileData:string, padData:string ):string => {
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let key = "";
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for (let i = 0; i < fileData.length; i++) {
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key += String.fromCharCode(-fileData[i].charCodeAt(0)+padData[i].toLowerCase().charCodeAt(0)+97);
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// console.log(`File char: ${fileData[i]} ${fileData[i].charCodeAt(0)} Pad Data: ${padData[i]} ${padData[i].toLocaleLowerCase().charCodeAt(0)} Key: ${key[i]} ${key[i].charCodeAt(0)}`)
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}
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return key;
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}
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main();
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