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net.rim.device.api.crypto
Class RC2DecryptorEngine

java.lang.Object
  |
  +--net.rim.device.api.crypto.RC2DecryptorEngine

All Implemented Interfaces:

BlockDecryptorEngine, SymmetricKeyDecryptorEngine

public final class RC2DecryptorEngine

extends Object

implements SymmetricKeyDecryptorEngine

The RC2DecryptorEngine class implements the decryption functionality of the RC2 block cipher.

We implemented RC2 as per RFC 2268.

The RC2 cipher operates on 64 bit blocks and supports key lengths between 1 and 1024 bits.

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

Field Summary

static int

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

Constructor Summary

RC2DecryptorEngine(RC2Key key) Creates an RC2DecryptorEngine object based on an RC2Key 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)
	String	getAlgorithm() Returns the name of the algorithm used, eg "RC2_64" ("RC2_" + keyBitLength).
	int	getBlockLength()
	int	getKeyLength() Returns the length of the key 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

RC2DecryptorEngine

public RC2DecryptorEngine(RC2Key key)
                   throws CryptoTokenException,
                          CryptoUnsupportedOperationException

Creates an RC2DecryptorEngine object based on an RC2Key that is initialized and used for decryption of the plaintext for all subsequent calls to the class.

Parameters:

key - Contains the key material 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, eg "RC2_64" ("RC2_" + keyBitLength).

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.

getKeyLength

public int getKeyLength()

Returns the length of the key in bytes. The key is used by the engine to decrypt data.

Returns:

An integer that represents the length of the key, 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 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.