add su command

src/emulator/commands/su.js

@@ -1,4 +1,5 @@
 const { Terminal } = require("xterm");
+const sleep = require("../../lib/sleep");
 
 /**
  * @param {string[]} argv
@@ -25,7 +26,37 @@ module.exports = async (argv, terminal, zsh) => {
     }
 
     terminal.write('Password: ');
+    /** @type {string} */
     const pass = await zsh.get_stdin({hide: true});
+    const some_random_array = new Uint16Array([12319, 14486, 12589, 13232]);
+    let checksum = new Uint32Array(pass.length);
 
-    terminal.write(pass);
+    let i = 0;
+    for (const letter of pass) {
+        checksum[i] = letter.charCodeAt(0) * 128;
+        checksum[i] += (i*8) - letter.charCodeAt(0);
+        i++;
+    }
+    i = undefined;
+
+    console.log(checksum, some_random_array);
+
+    let valid = true;
+    if (checksum.length == some_random_array.length)
+        for (let i = 0; i != some_random_array.length; i++) {
+            if (checksum[i] != some_random_array[i])
+                valid = false;
+        }
+    else
+        valid = false;
+
+    console.log(valid);
+
+    if (valid) {
+        terminal.writeln('yay, you did it!! congratulations :3');
+    } else {
+        await sleep(3000);
+        terminal.writeln('su: Authentication failure');
+        return 1;
+    }
 }