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java.lang.Object | +--net.rim.device.api.crypto.SkipjackDecryptorEngine
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.
SkipjackEncryptorEngine,
SkipjackKey| 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 |
public static final int BLOCK_LENGTH
| Constructor Detail |
public SkipjackDecryptorEngine(SkipjackKey key) throws CryptoTokenException, CryptoUnsupportedOperationException
SkipjackDecryptorEngine object based on a Skipjack
key that is initialized and
used for decryption of the plaintext for all subsequent calls to the class.
key - The key that will be used for decryption.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.| Method Detail |
public void decrypt(byte[] ciphertext,
int ciphertextOffset,
byte[] plaintext,
int plaintextOffset)
throws CryptoTokenException
BlockDecryptorEngine
BlockDecryptorEngineciphertext - 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.CryptoTokenException - Thrown when an error occurs with the crypto
token or the crypto token is invalid.public String getAlgorithm()
This method always returns the String "Skipjack".
public int getBlockLength()
BlockDecryptorEngine
BlockDecryptorEngine
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