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.

See Also:

SkipjackEncryptorEngine, SkipjackKey

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
	static int	BLOCK_LENGTH Represents the block length of the cipher in bytes, namely 8 bytes.

Constructor Summary
	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
	void	decrypt(byte[] ciphertext, int ciphertextOffset, byte[] plaintext, int plaintextOffset) Decodes a block of the given ciphertext into a block of plaintext.
	String	getAlgorithm() Returns the name of the algorithm used, ie "Skipjack".
	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.

See Also:

Constant Field Values

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

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.

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 algorithm used, ie "Skipjack".

This method always returns the String "Skipjack".

Specified by:

getAlgorithm in interface BlockDecryptorEngine

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

getBlockLength

public int getBlockLength()

Description copied from interface: BlockDecryptorEngine

Returns the block length of the block cipher in bytes.

Specified by:

getBlockLength in 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.

Since:

BlackBerry API 3.6.0

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.

Specified by:

decrypt in 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.

Since:

BlackBerry API 3.6.0