codeberg is different ig

bin/crypt.js

@@ -0,0 +1,42 @@
+// Implement modulo by replacing the negative operand 
+// with an equivalent positive operand that has the same wrap-around effect
+function mod(n, p) {
+	if (n < 0)
+		n = p - Math.abs(n) % p;
+
+	return n % p;
+}
+
+
+// Function will implement Caesar Cipher to
+// encrypt / decrypt the msg by shifting the letters
+// of the message acording to the key
+function encrypt(msg, key) {
+	var encMsg = "";
+
+	key -= 0;
+
+	for (var i = 0; i < msg.length; i++) {
+		var code = msg.charCodeAt(i);
+
+		// Encrypt only letters in 'A' ... 'Z' interval
+		if (code >= 97 && code <= 97 + 26 - 1) {
+			code -= 97;
+			code = mod(code + key, 26);
+			code += 97;
+		}
+		if (code >= 65 && code <= 65 + 26 - 1) {
+			code -= 65;
+			code = mod(code + key, 26);
+			code += 65;
+		}
+
+		encMsg += String.fromCharCode(code);
+	}
+
+	return encMsg;
+}
+
+function decrypt(msg, key) {
+	return encrypt(msg, 26 - key);
+}