Added some sanity checks to password hashing scripts.

bin/bcrypt.js

@@ -5,6 +5,9 @@ const saltRounds = 10;
 
 const stdout = process.stdout
 const stdin = process.stdin
+const argv = process.argv;
+
+const checkHash = argv.length > 2 ? argv[2] : undefined;
 
 let password = '';
 
@@ -19,6 +22,13 @@ process.stdin.on('end', () => {
     if (password[password.length - 1] === '\n') {
         password = password.substring(0, password.length - 1);
     }
-    const hash = bcrypt.hashSync(password, saltRounds);
-    stdout.write(`${hash}\n`);
+
+    if (checkHash !== undefined) {
+        const validPassword = bcrypt.compareSync(password, checkHash);
+        stdout.write(`${validPassword ? 'Valid password' : 'Invalid password'}\n`);
+        process.exit(validPassword ? 0 : 255);
+    } else {
+        const hash = bcrypt.hashSync(password, saltRounds);
+        stdout.write(`${hash}\n`);
+    }
 });