algorithm: xor cipher (TheAlgorithms#24)

Author: jonatan5524

Ciphers/XORCipher.ts

@@ -0,0 +1,15 @@
+/**
+ * @function XORCipher
+ * @description - Encrypt using an XOR cipher
+ * The XOR cipher is a type of additive cipher.
+ * Each character is bitwise XORed with the key.
+ * We loop through the input string, XORing each
+ * character with the key.
+ * @param {string} str - string to be encrypted
+ * @param {number} key - key for encryption
+ * @return {string} encrypted string
+ */
+export const XORCipher = (str: string, key: number): string =>
+  str.replace(/./g, (char: string) =>
+    String.fromCharCode(char.charCodeAt(0) ^ key)
+  )

Ciphers/test/XORCipher.test.ts

@@ -0,0 +1,8 @@
+import { XORCipher } from '../XORCipher';
+
+describe('Testing XORCipher function', () => {
+  it('passing a string & number as an argument', () => {
+    expect(XORCipher('test', 32)).toBe('TEST');
+    expect(XORCipher('TEST', 32)).toBe('test');
+  });
+});