Auth (openwebnet4j OpenWebNet Java library 0.5.2 API)

java.lang.Object
- org.openwebnet4j.communication.Auth

```
public class Auth
extends Object
```
Class contains helper methods for authenticating to a BUS OpenWebNet gateway using a numeric (OPEN) or alphanumeric (HMAC) password. Encoding algorithm for OPEN numeric password can be found at this link: https://rosettacode.org/wiki/OpenWebNet_Password#JavaScript HMAC authentication algorithm can be found at this Legrand/BTicino link: https://developer.legrand.com/documentation/open-web-net-for-myhome/

Author:

M. Valla - Initial contribution

Constructor Summary

Constructors
Constructor Description

Auth()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`protected static String`	`bytesToHex(byte[] bytes)`	Convert bytes array to hex string
`protected static String`	`calcHmacRb()`	Generate Rb HMAC random hex string from: key=timeMSEC_SINCE_EPOCH using SHA-256
`protected static String`	`calcOpenPass(String pass, String nonce)`	Encodes a numeric OPEN password
`protected static String`	`calcSHA256(String message)`	Return SHA-256 hash of the input string
`protected static String`	`digitToHex(String digits)`	Convert [0-9] digits string to hex string
`protected static String`	`hexToDigit(String hexString)`	Convert hex string to [0-9] digits string

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - Auth
```
public Auth()
```
- Method Detail
  - digitToHex
```
protected static String digitToHex(String digits)
```
    Convert [0-9] digits string to hex string
    
    Parameters:
    
    digits - string to convert
    
    Returns:
    
    hex string
  - hexToDigit
```
protected static String hexToDigit(String hexString)
```
    Convert hex string to [0-9] digits string
    
    Parameters:
    
    hexString - string to convert
    
    Returns:
    
    digits string
  - bytesToHex
```
protected static String bytesToHex(byte[] bytes)
```
    Convert bytes array to hex string
    
    Parameters:
    
    bytes - array to convert
    
    Returns:
    
    hex string
  - calcHmacRb
```
protected static String calcHmacRb()
```
    Generate Rb HMAC random hex string from: key=timeMSEC_SINCE_EPOCH using SHA-256
    
    Returns:
    
    the generated Rb HMAC
  - calcSHA256
```
protected static String calcSHA256(String message)
```
    Return SHA-256 hash of the input string
    
    Parameters:
    
    message - string to hash
    
    Returns:
    
    the hash string
  - calcOpenPass
```
protected static String calcOpenPass(String pass,
                                     String nonce)
```
    Encodes a numeric OPEN password
    
    Parameters:
    
    pass - numeric password to encode
    
    nonce - received from the gateway
    
    Returns:
    
    the encoded password