org.bouncycastle.crypto.modes
Class CTSBlockCipher
public class CTSBlockCipher
A Cipher Text Stealing (CTS) mode cipher. CTS allows block ciphers to
be used to produce cipher text which is the same length as the plain text.
int | doFinal(byte[] out, int outOff) - Process the last block in the buffer.
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int | getOutputSize(int len) - return the size of the output buffer required for an update plus a
doFinal with an input of len bytes.
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int | getUpdateOutputSize(int len) - return the size of the output buffer required for an update
an input of len bytes.
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int | processByte(byte in, byte[] out, int outOff) - process a single byte, producing an output block if neccessary.
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int | processBytes(byte[] in, int inOff, int len, byte[] out, int outOff) - process an array of bytes, producing output if necessary.
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CTSBlockCipher
public CTSBlockCipher(BlockCipher cipher)
Create a buffered block cipher that uses Cipher Text Stealing
cipher
- the underlying block cipher this buffering object wraps.
doFinal
public int doFinal(byte[] out,
int outOff)
throws DataLengthException,
IllegalStateException,
InvalidCipherTextException
Process the last block in the buffer.
- doFinal in interface BufferedBlockCipher
out
- the array the block currently being held is copied into.outOff
- the offset at which the copying starts.
- the number of output bytes copied to out.
InvalidCipherTextException
- if cipher text decrypts wrongly (in
case the exception will never get thrown).
getOutputSize
public int getOutputSize(int len)
return the size of the output buffer required for an update plus a
doFinal with an input of len bytes.
- getOutputSize in interface BufferedBlockCipher
len
- the length of the input.
- the space required to accommodate a call to update and doFinal
with len bytes of input.
getUpdateOutputSize
public int getUpdateOutputSize(int len)
return the size of the output buffer required for an update
an input of len bytes.
- getUpdateOutputSize in interface BufferedBlockCipher
len
- the length of the input.
- the space required to accommodate a call to update
with len bytes of input.
processByte
public int processByte(byte in,
byte[] out,
int outOff)
throws DataLengthException,
IllegalStateException
process a single byte, producing an output block if neccessary.
- processByte in interface BufferedBlockCipher
in
- the input byte.out
- the space for any output that might be produced.outOff
- the offset from which the output will be copied.
- the number of output bytes copied to out.
DataLengthException
- if there isn't enough space in out.
processBytes
public int processBytes(byte[] in,
int inOff,
int len,
byte[] out,
int outOff)
throws DataLengthException,
IllegalStateException
process an array of bytes, producing output if necessary.
- processBytes in interface BufferedBlockCipher
in
- the input byte array.inOff
- the offset at which the input data starts.len
- the number of bytes to be copied out of the input array.out
- the space for any output that might be produced.outOff
- the offset from which the output will be copied.
- the number of output bytes copied to out.
DataLengthException
- if there isn't enough space in out.