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Class iaik.security.cipher.TripleDES

java.lang.Object
   |
   +----java.security.Cipher
           |
           +----iaik.security.cipher.TripleDES

public class TripleDES

extends Cipher

implements SymmetricCipher

TripleDES()

Constructor for a TripleDES Cipher.

engineBlockSize()

Returns the length of an output block, in bytes.

engineInitDecrypt(Key)

Initializes this cipher for decryption, using the specified key.

engineInitEncrypt(Key)

Initializes this cipher for encryption, using the specified key.

engineUpdate(byte[], int, int, byte[], int)

Add to the bytes to be processed.

 public TripleDES()

Constructor for a TripleDES Cipher. This constructor is only for initializing the superclass. Applications should not call this constructor to get a TripleDES Cipher; they should call one of the Cipher.getInstance factory methods instead.

See Also:

Cipher

 protected void engineInitEncrypt(Key key) throws InvalidKeyException

Initializes this cipher for encryption, using the specified key. The format of the key must be "RAW" and the length must be 16 or 32 bytes. If the keylength is 16 bytes then TripleDES with 2 keys is used, if the keylength is 32 TripleDES with 3 keys is used.

Parameters:

key - the key to use for encryption

Throws: InvalidKeyException

if the key is invalid

Overrides:

engineInitEncrypt in class Cipher

 protected void engineInitDecrypt(Key key) throws InvalidKeyException

Initializes this cipher for decryption, using the specified key. The format of the key must be "RAW" and the length must be 8 bytes or 64 bits.

Parameters:

key - the key to use for encryption

Throws: InvalidKeyException

if the key is invalid

Overrides:

engineInitDecrypt in class Cipher

 public int engineUpdate(byte in[],
                         int inOff,
                         int inLen,
                         byte out[],
                         int outOff)

Add to the bytes to be processed. The result is written to the provided out buffer. The implementation is free to buffer any data, if the number of bytes passed is insufficient to process a whole block.

Parameters:

in - the input data

inOff - the offset indicating where the subarray starts in the in array

inLen - the length of the subarray

out - the output buffer.

outOff - the offset indicating where to start writing the result into the output buffer

Returns:

the number of bytes written to out.

Throws: IllegalBlockSizeException

if the length of the input data is not 64 bit

Overrides:

engineUpdate in class Cipher

 protected int engineBlockSize()

Returns the length of an output block, in bytes.

Returns:

the length in bytes of a block for this cipher

Overrides:

engineBlockSize in class Cipher

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