net.rim.device.api.crypto
Class PRNGEncryptor

java.lang.Object
  java.io.OutputStream
      net.rim.device.api.crypto.CryptoOutputStream
          net.rim.device.api.crypto.EncryptorOutputStream
              net.rim.device.api.crypto.StreamEncryptor
                  net.rim.device.api.crypto.PRNGEncryptor

public final class PRNGEncryptor
extends StreamEncryptor

The PRNGEncryptor is used in conjunction with a PseudoRandomSource to encrypt data provided to this class in a stream interface to the calling class.

A PRNG represents a Pseudo Random Number Generator.

It provides a similar relationship or functionality that the BlockEncryptor uses for BlockEncryptorEngines. That is, it allows you to use a PseudoRandomSource as an output stream instead of relying on the encryption mechanisms exposed in the PseudoRandomSource class.

See Also:

PRNGDecryptor

Category:

Signed: This element is only accessible by signed applications. If you intend to use this element, please visit http://www.blackberry.com/go/codesigning to obtain a set of code signing keys. Code signing is only required for applications running on BlackBerry smartphones; development on BlackBerry Smartphone Simulators can occur without code signing.

Since:

BlackBerry API 3.6.0

Field Summary

Fields inherited from class net.rim.device.api.crypto.CryptoOutputStream

_out

Constructor Summary
	PRNGEncryptor(PseudoRandomSource keystream, OutputStream output) Creates a PRNGEncryptor object given a specified output stream and a keystream will generate numbers to encrypt with.

Method Summary
	protected void	encrypt(byte[] plaintext, int plaintextOffset, int plaintextLength, byte[] ciphertext) Encrypts data using the specific implementation of the chosen stream encryptor.
	String	getAlgorithm() Returns the name of the encryption algorithm used, eg "ARC4".

Methods inherited from class net.rim.device.api.crypto.StreamEncryptor

flush, write

Methods inherited from class net.rim.device.api.crypto.CryptoOutputStream

close, flush, getOutputStream, write, write

Methods inherited from class java.lang.Object

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

Constructor Detail

PRNGEncryptor

public PRNGEncryptor(PseudoRandomSource keystream,
                     OutputStream output)

Creates a PRNGEncryptor object given a specified output stream and a keystream will generate numbers to encrypt with.

Parameters:

output - An OutputStream object that will contain the ciphertext after the class has completed its task.

keystream - A PseudoRandomSource object to create random numbers that provide a secure method for encrypting the stream.

Category:

Signed: This element is only accessible by signed applications. If you intend to use this element, please visit http://www.blackberry.com/go/codesigning to obtain a set of code signing keys. Code signing is only required for applications running on BlackBerry smartphones; development on BlackBerry Smartphone Simulators can occur without code signing.

Since:

BlackBerry API 3.6.0

Method Detail

getAlgorithm

public String getAlgorithm()

Returns the name of the encryption algorithm used, eg "ARC4".

Specified by:

getAlgorithm in class CryptoOutputStream

Returns:

A String that represents the name of the algorithm.

Category:

Signed: This element is only accessible by signed applications. If you intend to use this element, please visit http://www.blackberry.com/go/codesigning to obtain a set of code signing keys. Code signing is only required for applications running on BlackBerry smartphones; development on BlackBerry Smartphone Simulators can occur without code signing.

Since:

BlackBerry API 3.6.0

encrypt

protected void encrypt(byte[] plaintext,
                       int plaintextOffset,
                       int plaintextLength,
                       byte[] ciphertext)
                throws CryptoTokenException

Description copied from class: StreamEncryptor

Encrypts data using the specific implementation of the chosen stream encryptor.

Specified by:

encrypt in class StreamEncryptor

Parameters:

plaintext - A byte array containing the input to the stream cipher.

plaintextOffset - The offset, or initial position within the array, of the information to encrypt.

plaintextLength - The length of the information to encrypt.

ciphertext - A byte array to hold the output of the stream cipher.

Throws:

CryptoTokenException - Thrown when a problem occurs with the crypto token or the crypto token is invalid.

Category:

Signed: This element is only accessible by signed applications. If you intend to use this element, please visit http://www.blackberry.com/go/codesigning to obtain a set of code signing keys. Code signing is only required for applications running on BlackBerry smartphones; development on BlackBerry Smartphone Simulators can occur without code signing.

Since:

BlackBerry API 3.6.0