51 lines
1.7 KiB
JavaScript
51 lines
1.7 KiB
JavaScript
const CHARS = [
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B',
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'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',
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'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
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];
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function generatePad(string) {
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const pad = [];
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for (let i = 0; i < string.length; i++) {
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const letter = Math.floor(Math.random() * CHARS.length);
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pad.push(CHARS[letter]);
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}
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return pad;
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}
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function encrypt(string) {
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const strippedString = string.replace(/[^a-zA-Z0-9]/g, '');
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console.log('strippedString', strippedString);
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const pad = generatePad(strippedString);
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return {
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oneTimePad: pad,
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encryptedMessage: strippedString.toUpperCase().split('').map((letter, index) => {
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const letterValue = CHARS.indexOf(letter);
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const padValue = CHARS.indexOf(pad[index]);
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return CHARS[(letterValue + padValue) % CHARS.length];
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}).join(''),
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};
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}
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function decrypt(string, pad) {
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return string.split('').map((letter, index) => {
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const letterValue = CHARS.indexOf(letter);
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const padValue = CHARS.indexOf(pad[index]);
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return CHARS[(letterValue - padValue) % CHARS.length];
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}).join('');
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}
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document.getElementById('encryptInput').onclick = () => {
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const input = document.getElementById('input').value;
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const encryption = encrypt(input);
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document.getElementById('pad').innerHTML = encryption.oneTimePad.join('');
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document.getElementById('encrypted').innerHTML = encryption.encryptedMessage;
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}
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document.getElementById('decryptInput').onclick = () => {
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const input = document.getElementById('encryptedInput').value;
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const pad = document.getElementById('encryptedInputPad').value.split('');
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const output = decrypt(input, pad);
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document.getElementById('decrypted').innerHTML = output;
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}
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