Add Xor cipher (TheAlgorithms#227)

Co-authored-by: Sutthinart Khunvadhana <gai.su@everapp.io>
QUANTAXIS · Oct 3, 2021 · f614286 · f614286
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diff --git a/DIRECTORY.md b/DIRECTORY.md
@@ -8,6 +8,7 @@
     * [Rot13](https://github.com/TheAlgorithms/Rust/blob/master/src/ciphers/rot13.rs)
     * [Sha256](https://github.com/TheAlgorithms/Rust/blob/master/src/ciphers/sha256.rs)
     * [Vigenere](https://github.com/TheAlgorithms/Rust/blob/master/src/ciphers/vigenere.rs)
+    * [Xor](https://github.com/TheAlgorithms/Rust/blob/master/src/ciphers/xor.rs)
   * Data Structures
     * [Avl Tree](https://github.com/TheAlgorithms/Rust/blob/master/src/data_structures/avl_tree.rs)
     * [B Tree](https://github.com/TheAlgorithms/Rust/blob/master/src/data_structures/b_tree.rs)

diff --git a/README.md b/README.md
@@ -88,6 +88,7 @@ RESTART BUILD
 - [x] [Caesar](./src/ciphers/caesar.rs)
 - [x] [Vigenère](./src/ciphers/vigenere.rs)
 - [x] [Morse Code](./src/ciphers/morse_code.rs)
+- [x] [XOR](./src/ciphers/xor.rs)
 - Rot13
   - [x] [Rot13](./src/ciphers/rot13.rs)
   - [x] [Another Rot13](./src/ciphers/another_rot13.rs)

diff --git a/src/ciphers/mod.rs b/src/ciphers/mod.rs
@@ -4,10 +4,12 @@ mod morse_code;
 mod rot13;
 mod sha256;
 mod vigenere;
+mod xor;
 
 pub use self::another_rot13::another_rot13;
 pub use self::caesar::caesar;
 pub use self::morse_code::{decode, encode};
 pub use self::rot13::rot13;
 pub use self::sha256::sha256;
 pub use self::vigenere::vigenere;
+pub use self::xor::xor;
diff --git a/src/ciphers/xor.rs b/src/ciphers/xor.rs
@@ -0,0 +1,22 @@
+pub fn xor(text: &str, key: u8) -> String {
+    text.chars().map(|c| ((c as u8) ^ key) as char).collect()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_simple() {
+        let test_string = "test string";
+        let ciphered_text = xor(test_string, 32);
+        assert_eq!(test_string, xor(&ciphered_text, 32));
+    }
+
+    #[test]
+    fn test_every_alphabet_with_space() {
+        let test_string = "The quick brown fox jumps over the lazy dog";
+        let ciphered_text = xor(test_string, 64);
+        assert_eq!(test_string, xor(&ciphered_text, 64));
+    }
+}