public enum ScramMechanism {
    UNKNOWN(0),
    HMAC_SHA_256(1),
    HMAC_SHA_512(2);

    byte type;

    private ScramMechanism(byte type) {
        this.type = type;
    }
}

public class ScramMechanismInfo {
    private final ScramMechanism mechanism;
    private final int iterations;
    private final byte[] salt;
    private final byte[] storedKey;
    private final byte[] serverKey;
}

public class ScramUserListing {
    private final String name;
    private final List<ScramMechanismInfo> infos;
}

public class ListScramUsersOptions extends AbstractOptions<ListScramUsersOptions> { }

default ListScramUsersResult listScramUsers() {
    return listScramUsers(new ListScramUsersOptions());
}

ListScramUsersResult listScramUsers(ListScramUsersOptions options);

public class ListScramUsersResult {
    public KafkaFuture<Map<String, ScramUserListing>> all();
}

public class ScramUserDeletion {
    private final String user;
}

public class ScramCredential {
    private final ScramMechanismInfo info;
    private final byte[] salt;
    private final Stringbyte[] password;

    // There will be one constructor that randomly generates a salt, and one that accepts a pre-defined salt.
}

public class ScramUserAlteration {
    private final String user;
    private final List<ScramCredential> credentials;

    public ScramCredentialAlteration(String user, List<ScramCredential> credentials) {
        this.user = user;
        this.credentials = credentials;
    }

    public String user() {
        return user;
    }

    public List<ScramCredential> credentials() {
        return credentials;
    }
}

public class AlterScramUsersOptions extends AbstractOptions<AlterScramUsersOptions> {}

default AlterScramUsersResult alterScramUsers(List<ScramUserDeletion> deletions,
                                              List<ScramUserAlteration> alterations) {
    return alterScramUsers(deletions, alterations, new AlterScramUsersOptions());
}

AlterScramUsersResult alterScramUsers(List<ScramUserDeletion> deletions,
                                      List<ScramUserAlteration> alterations,
                                      AlterScramUsersOptions options);

public class AlterScramCredentialsResult {
    public KafkaFuture<Void> all();
    public Map<String, KafkaFuture<Void>> results();
}