PasswordService (sigma-component 2.09 API)

```
public final class PasswordService
extends Object
```
A class that encrypts a string and checks it against another stored encrypted string, in order to validate a user login.

Constructors
Constructor and Description
`PasswordService()` Create an instance of PasswordService

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`addUser(User user)`
`boolean`	`authenticate(String username, String pass)` Take a user name and unencrypted password and compare it to an existing collection of users with encrypted passwords.
`String`	`encrypt(String plaintext)` Encrypts a string with a deterministic algorithm.
`static PasswordService`	`getInstance()`
`User`	`getUser(String username)`
`static void`	`main(String[] args)`
`void`	`updateUser(User user)`
`boolean`	`userExists(String username)`
`void`	`writeUserFile()`

encrypt
```
public String encrypt(String plaintext)
```
Encrypts a string with a deterministic algorithm.

public static PasswordService getInstance()

public void writeUserFile()
                   throws IOException

public boolean userExists(String username)

public static void main(String[] args)

Class PasswordService