SHOW Signed
 

net.rim.device.api.crypto
Class CAST128DecryptorEngine

java.lang.Object
  |
  +--net.rim.device.api.crypto.CAST128DecryptorEngine
All Implemented Interfaces:
BlockDecryptorEngine, SymmetricKeyDecryptorEngine

public final class CAST128DecryptorEngine
extends Object
implements SymmetricKeyDecryptorEngine

Creates a CAST 128 decryption engine. The CAST algorithm was designed by Carlisle Adams and Stafford Tavares. This version of CAST has a 128 bit key and a 64 bit block size.

This cipher is available worldwide on a royalty-free basis for commercial and non-commercial use.

For more information please refer to RFC 2144.

(@link CAST128Key More information on the key used in this engine.)

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:
JDE 3.6.0

Field Summary
 Category: Signed static int BLOCK_LENGTH
          Represents the block length of the cipher in bytes, namely 8 bytes.
 
Constructor Summary
 Category: Signed CAST128DecryptorEngine(CAST128Key key)
          Creates a CAST128DecryptorEngine object based on a given CAST128 key.
 
Method Summary
 Category: Signed  void decrypt(byte[] ciphertext, int ciphertextOffset, byte[] plaintext, int plaintextOffset)
          Decodes a block of the given ciphertext into a block of plaintext.
 Category: Signed  String getAlgorithm()
          Returns the name of the algorithm used, ie "CAST128".
 Category: Signed  int getBlockLength()
          Returns the block length of the block cipher in bytes.
 
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

BLOCK_LENGTH

public static final int BLOCK_LENGTH
Represents the block length of the cipher in bytes, namely 8 bytes.
Since:
JDE 3.6.0
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.
Constructor Detail

CAST128DecryptorEngine

public CAST128DecryptorEngine(CAST128Key key)
                       throws CryptoTokenException,
                              CryptoUnsupportedOperationException
Creates a CAST128DecryptorEngine object based on a given CAST128 key.

Parameters:
key - A CAST128 key containing the key material that will be used for decryption.

Throws:
CryptoTokenException - Thrown when a problem occurs with a crypto token or the crypto token is invalid.
CryptoUnsupportedOperationException - Thrown if a call is made to an unsupported operation.
Since:
JDE 3.6.0
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.
Method Detail

decrypt

public void decrypt(byte[] ciphertext,
                    int ciphertextOffset,
                    byte[] plaintext,
                    int plaintextOffset)
             throws CryptoTokenException
Description copied from interface: BlockDecryptorEngine
Decodes a block of the given ciphertext into a block of plaintext.

Since:
JDE 3.6.0

Following copied from interface: BlockDecryptorEngine
Parameters:
ciphertext - A byte array containing the input that is to be decrypted.
ciphertextOffset - The starting offset, or initial byte position, of the data within the input array.
plaintext - A byte array containing the output from the method.
plaintextOffset - The starting offset, or initial byte position, of the data within the output array.
Throws:
CryptoTokenException - Thrown when an error 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.

getAlgorithm

public String getAlgorithm()
Returns the name of the algorithm used, ie "CAST128".

This method will always return the string "CAST128".

Returns:
A string representing the name of the algorithm.
Since:
JDE 3.6.0
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.

getBlockLength

public int getBlockLength()
Description copied from interface: BlockDecryptorEngine
Returns the block length of the block cipher in bytes.

Since:
JDE 3.6.0

Following copied from interface: BlockDecryptorEngine
Returns:
An integer that specifies the length of a block of data.
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.



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