public class SICBlockCipher extends StreamBlockCipher implements SkippingStreamCipher
Constructor and Description |
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SICBlockCipher(BlockCipher c)
Basic constructor.
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Modifier and Type | Method and Description |
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protected byte |
calculateByte(byte in) |
java.lang.String |
getAlgorithmName()
Return the name of the algorithm the cipher implements.
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int |
getBlockSize()
Return the block size for this cipher (in bytes).
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long |
getPosition()
Return the current "position" of the cipher
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void |
init(boolean forEncryption,
CipherParameters params)
Initialise the cipher.
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int |
processBlock(byte[] in,
int inOff,
byte[] out,
int outOff)
Process one block of input from the array in and write it to
the out array.
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void |
reset()
reset the cipher.
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long |
seekTo(long position)
Reset the cipher and then skip forward to a given position.
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long |
skip(long numberOfBytes)
Skip numberOfBytes forwards, or backwards.
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getUnderlyingCipher, processBytes, returnByte
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
processBytes, returnByte
public SICBlockCipher(BlockCipher c)
c
- the block cipher to be used.public void init(boolean forEncryption, CipherParameters params) throws java.lang.IllegalArgumentException
StreamCipher
init
in interface BlockCipher
init
in interface StreamCipher
forEncryption
- if true the cipher is initialised for
encryption, if false for decryption.params
- the key and other data required by the cipher.java.lang.IllegalArgumentException
- if the params argument is
inappropriate.public java.lang.String getAlgorithmName()
StreamCipher
getAlgorithmName
in interface BlockCipher
getAlgorithmName
in interface StreamCipher
public int getBlockSize()
BlockCipher
getBlockSize
in interface BlockCipher
public int processBlock(byte[] in, int inOff, byte[] out, int outOff) throws DataLengthException, java.lang.IllegalStateException
BlockCipher
processBlock
in interface BlockCipher
in
- the array containing the input data.inOff
- offset into the in array the data starts at.out
- the array the output data will be copied into.outOff
- the offset into the out array the output will start at.DataLengthException
- if there isn't enough data in in, or
space in out.java.lang.IllegalStateException
- if the cipher isn't initialised.protected byte calculateByte(byte in) throws DataLengthException, java.lang.IllegalStateException
calculateByte
in class StreamBlockCipher
DataLengthException
java.lang.IllegalStateException
public void reset()
StreamCipher
reset
in interface BlockCipher
reset
in interface StreamCipher
public long skip(long numberOfBytes)
SkippingCipher
skip
in interface SkippingCipher
numberOfBytes
- the number of bytes to skip (positive forward, negative backwards).public long seekTo(long position)
SkippingCipher
seekTo
in interface SkippingCipher
position
- the number of bytes in to set the cipher state to.public long getPosition()
SkippingCipher
getPosition
in interface SkippingCipher