SHOW Signed

net.rim.device.api.crypto
Class TripleDESDecryptorEngine

java.lang.Object
  |
  +--net.rim.device.api.crypto.TripleDESDecryptorEngine

All Implemented Interfaces:

BlockDecryptorEngine, SymmetricKeyDecryptorEngine

public final class TripleDESDecryptorEngine

extends Object

implements SymmetricKeyDecryptorEngine

Implements the raw functionality of the TripleDES algorithm.

We implemented TripleDES as it's defined in NIST's FIPS 46-3.

For a code sample using the Triple DES 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.

See Also:

TripleDESEncryptorEngine, TripleDESKey

Field Summary

static int

BLOCK_LENGTH Represents the block length in bytes for the algorithm, namely 8 bytes.

Constructor Summary

TripleDESDecryptorEngine(TripleDESKey key) Creates a TripleDESDecryptorEngine object based upon a TripleDES key as input, and initializes this key for use with the algorithm.

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.
	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 in bytes for the algorithm, namely 8 bytes.

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

TripleDESDecryptorEngine

public TripleDESDecryptorEngine(TripleDESKey key)
                         throws CryptoTokenException,
                                CryptoUnsupportedOperationException

Creates a TripleDESDecryptorEngine object based upon a TripleDES key as input, and initializes this key for use with the algorithm.

Parameters:

key - The TripleDESKey object to use for decryption.

Throws:

CryptoTokenException - Thrown when a problem occurs with the 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 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.

This method will always return the String "TripleDES"

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 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.

Specified by:

getBlockLength in interface BlockDecryptorEngine

Following copied from interface: net.rim.device.api.crypto.BlockDecryptorEngine

Returns:

An integer that specifies the length of a block of data.

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.

Specified by:

decrypt in interface BlockDecryptorEngine

Since:

JDE 3.6

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.