Three Eclipse Mosquitto passwd files are included, the passwords for all users are included in password.txt.
The passwd files included were all generated using the stock Eclipse software mosquitto_passwd, from Mosquitto version 2.0.5. In this version, the user is permitted to specify the hash type for each user added to the passwd file, so to reflect this, there are passwd files including hashes of each type (sha512 and sha512-pbkdf2), plus one where the hash types are mixed.