SHOW Signed

net.rim.device.api.crypto
Class SkipjackDecryptorEngine

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

public final class SkipjackDecryptorEngine
extends Object
implements SymmetricKeyDecryptorEngine

The SkipjackDecryptorEngine class implements the decryption functionality of the Skipjack block cipher.

We implemented Skipjack as it's defined in Skipjack

Skipjack operates on 64 bit blocks and has a key length of 80 bits.

For a code sample using the Skipjack decryptor engine, click here.

Category:
Signed: This element is only accessible by signed clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.

Since:
JDE 3.6.0
See Also:
SkipjackEncryptorEngine, SkipjackKey

Field Summary
 Category: Signed static int BLOCK_LENGTH
          Represents the block length of the cipher in bytes, namely 8 bytes.
 
Constructor Summary
 Category: Signed SkipjackDecryptorEngine(SkipjackKey key)
          Creates a SkipjackDecryptorEngine object based on a Skipjack key that is initialized and used for decryption of the plaintext for all subsequent calls to the class.
 
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 "Skipjack".
 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 clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.
Constructor Detail

SkipjackDecryptorEngine

public SkipjackDecryptorEngine(SkipjackKey key)
                        throws CryptoTokenException,
                               CryptoUnsupportedOperationException
Creates a SkipjackDecryptorEngine object based on a Skipjack key that is initialized and used for decryption of the plaintext for all subsequent calls to the class.

Parameters:
key - The key that will be used for decryption.
Throws:
CryptoTokenException - Thrown when an error occurs with a crypto token, or the crypto token is invalid.
CryptoUnsupportedOperationException - Thrown when a call is made to an unsupported operation.
Since:
JDE 3.6.0
Category:
Signed: This element is only accessible by signed clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.
Method Detail

getAlgorithm

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

This method always returns the String "Skipjack".

Returns:
A String that represents the name of the algorithm.
Since:
JDE 3.6.0
Category:
Signed: This element is only accessible by signed clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.

getBlockLength

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

Since:
JDE 3.6.0
Category:
Signed: This element is only accessible by signed clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.

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 4.0.2
Category:
Signed: This element is only accessible by signed clients. If you intend to use this element, please contact RIM to establish the necessary agreements that will allow you to have your COD files signed. Signing is only required for use on the device, development under the JDE can occur without signing the CODs.


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