com.dkfqs.tools.websocket

Class Random

java.lang.Object

com.dkfqs.tools.websocket.Random

public class Random
extends java.lang.Object

A thread safe random value generator for WebSockets. Note that the random values are created in a fast way and therefore not 100% secure in a cryptographic sense.

Constructor Summary

Constructors

Constructor and Description
Random() Create a new initialized instance.

Method Summary

Modifier and Type	Method and Description
java.lang.String	calcServerAcceptKeyB64(java.lang.String webSocketKeyB64) Precalculate the expected WebSocket accept key received from the server in the HTTP response (thread safe).
byte[]	get16ByteRandom() Get a 16 bytes random value (thread safe).
byte[]	get20ByteRandom() Get a 20 bytes random value (thread safe).
byte[]	get4ByteRandom() Get a 4 bytes random value (thread safe).
java.lang.String	getNewWebSocketKeyB64() Get a new WebSocket random key which can be send to the server in the HTTP request (thread safe).
byte[]	getSHA1(byte[] b) Get a SHA-1 hash (thread safe).

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Random

public Random()

Create a new initialized instance. Note: normally you need only one instance.

Method Detail

getNewWebSocketKeyB64

public java.lang.String getNewWebSocketKeyB64()

Get a new WebSocket random key which can be send to the server in the HTTP request (thread safe).

Returns:

a new WebSocket random key in Base 64 format

calcServerAcceptKeyB64

public java.lang.String calcServerAcceptKeyB64(java.lang.String webSocketKeyB64)

Precalculate the expected WebSocket accept key received from the server in the HTTP response (thread safe).

Parameters:

webSocketKeyB64 - the WebSocket key which was sent to the server in Base 64 format

Returns:

the expected value of the WebSocket accept key received from the server in Base 64 format

getSHA1

public byte[] getSHA1(byte[] b)

Get a SHA-1 hash (thread safe).

Parameters:

b - the bytes from which the SHA-1 hash is calculated.

Returns:

the SHA-1 hash

get20ByteRandom

public byte[] get20ByteRandom()

Get a 20 bytes random value (thread safe).

Returns:

a 20 bytes random value

get16ByteRandom

public byte[] get16ByteRandom()

Get a 16 bytes random value (thread safe).

Returns:

a 16 bytes random value

get4ByteRandom

public byte[] get4ByteRandom()

Get a 4 bytes random value (thread safe).

Returns:

a 4 bytes random value