Create script.js

script.js

@@ -0,0 +1,54 @@
+function caesarCipher(str, shift) {
+    return str.split('').map(char => {
+        if (char.match(/[a-z]/i)) {
+            let code = char.charCodeAt();
+
+            if ((code >= 65) && (code <= 90))
+                return String.fromCharCode(((code - 65 + shift) % 26) + 65);
+
+            else if ((code >= 97) && (code <= 122))
+                return String.fromCharCode(((code - 97 + shift) % 26) + 97);
+        }
+        return char;
+    }).join('');
+}
+
+function vigenereCipher(text, key) {
+    let output = '';
+    key = key.toUpperCase();
+
+    for (let i = 0, j = 0; i < text.length; i++) {
+        let c = text.charAt(i);
+
+        if (c.match(/[a-z]/i)) {
+            let code = text.charCodeAt(i);
+            if ((code >= 65) && (code <= 90))
+                c = String.fromCharCode(((code - 65 + key.charCodeAt(j % key.length) - 65) % 26) + 65);
+            else if ((code >= 97) && (code <= 122))
+                c = String.fromCharCode(((code - 97 + key.charCodeAt(j % key.length) - 65) % 26) + 97);
+
+            j++;
+        }
+        output += c;
+    }
+    return output;
+}
+
+function encryptText() {
+    const inputText = document.getElementById('inputText').value;
+    const method = document.getElementById('encryptionMethod').value;
+    let encryptedText = '';
+
+    if (method === 'caesar') {
+        const shift = 3; // You can customize the shift value
+        encryptedText = caesarCipher(inputText, shift);
+    } else if (method === 'vigenere') {
+        const key = 'KEY'; // You can customize the key
+        encryptedText = vigenereCipher(inputText, key);
+    } else if (method === 'aes') {
+        // AES encryption will require more complex setup, usually handled server-side
+        encryptedText = 'AES Encryption is more complex and is usually done on the server-side.';
+    }
+
+    document.getElementById('outputText').value = encryptedText;
+}