Untitled

<!doctype html>

<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Hash</title>
</head>
 
<body>
	<p style="margin-bottom: 5px;">Llave</p>
	<input id="key"><br>
	<p style="margin-bottom: 5px;">Texto a convertir (Solo caracteres del 33 al 126 respecto a la <a href="https://www.rapidtables.com/code/text/ascii-table.html" target="blank">Tabla ASCII</a> )</p>
	<input id="text"><br>
	<button id="encrypt" style="margin-top: 15px;">Encriptar</button>
	<button id="decrypt" >Desencriptar</button><br>
	<p style="margin-bottom: 5px;">Resultado: </p><input id="result">
	<button id="load">Cargar</button>
	
	<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
	<script>
		const ascii_first = 33;
		const ascii_last = 126;
		const total_chars = ascii_last-ascii_first;

		function hashText(key, text)
		{
			var new_text = "";
			var diff = 0;
			for (var i = 0; i < key.length; i++) {
				const ascii = key[i].charCodeAt(0);
				if (isValidByASCII(ascii)) {
					diff = diff+ascii;
				}
				else {
					alert("Ocurrio un error | Char: [" + key[i] + "] CharCode: [" + ascii + "] Index: [" + i + "] | (hash | key)");
					return false;
				}
			}
			for (var i = 0; i < text.length; i++) {
				const ascii = text[i].charCodeAt(0);
				if (isValidByASCII(ascii)) {
					const new_ascii = getNumberLimit(ascii+(diff*(i+1)), total_chars)+ascii_first;
					const new_char = String.fromCharCode(new_ascii);
					new_text = new_text + new_char;
				}
				else {
					alert("Ocurrio un error | Char: [" + text[i] + "] CharCode: [" + ascii + "] Index: [" + i + "] | (hash | text)");
					return false;
				}
			}
			return new_text;
		}

		function unhashText(key, text)
		{
			var new_text = "";
			var diff = 0;
			for (var i = 0; i < key.length; i++) {
				const ascii = key[i].charCodeAt(0);
				if (isValidByASCII(ascii)) {
					diff = diff+ascii;
				}
				else {
					alert("Ocurrio un error | Char: [" + key[i] + "] ASCII: [" + ascii + "] Index: [" + i + "] | (hash | key)");
					return false;
				}
			}
			for (var i = 0; i < text.length; i++) {
				const ascii = text[i].charCodeAt(0);
				if (isValidByASCII(ascii)) {
					const new_ascii = getNumberLimit(-(diff*(i+1))+(ascii-(ascii_first*2)), total_chars)+ascii_first;
					const new_char = String.fromCharCode(new_ascii);
					new_text = new_text + new_char;
				}
				else {
					alert("Ocurrio un error | Char: [" + text[i] + "] ASCII: [" + ascii + "] Index: [" + i + "] | (unhash | text)");
					return false;
				}
				
			}
			return new_text;
		}

		function isValidByASCII(index){
			return index >= ascii_first && index <= ascii_last;
		}

		function getNumberLimit(index, max)
		{
			return index-(Math.floor(index/(max+1))*(max+1));
		}

		$("#encrypt").click(function() {
			const key = $("#key").val();
			const text = $("#text").val();
			$("#result").val(hashText(key, text));
		});
		$("#decrypt").click(function() {
			const key = $("#key").val();
			const text = $("#text").val();
			$("#result").val(unhashText(key, text));
		});
		$("#load").click(function() {
			const text = $("#result").val();
			$("#text").val(text);
		});

		
	</script>
</body>
</html>
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