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script.js
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script.js
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let message = prompt("Сообщение для шифровки: ").toUpperCase();
let key = prompt("Ключ шифровки: ");
let itog = "";
key = key.split("");
console.log(message);
console.log(key);
while (message.length > key.length) {
for (let i = 0; i <= key.length; i++) {
key.push(key[i]);
if (message.length == key.length) {
break;
}
}
}
let encryption = (str) => {
array = [];
finalArray = [];
for (let i = 0; i < str.length; i++) {
let symbol = str.charCodeAt(i) + Number(key[i]);
array.push(symbol);
}
for (let k = 0; k < array.length; k++) {
x = String.fromCharCode(array[k]);
finalArray.push(x);
}
return finalArray.join("");
};
let decryption = (str) => {
array = [];
finalArray = [];
for (let i = 0; i < str.length; i++) {
let symbol = str.charCodeAt(i) - Number(key[i]);
array.push(symbol);
}
for (let k = 0; k < array.length; k++) {
x = String.fromCharCode(array[k]);
finalArray.push(x);
}
return finalArray.join("");
};
let s = encryption(message);
console.log(s);
console.log(decryption(s));