| java.lang.Object
 org.bouncycastle.crypto.BufferedBlockCipher
All known Subclasses: org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher, org.bouncycastle.crypto.modes.PaddedBlockCipher, org.bouncycastle.crypto.modes.CTSBlockCipher,
| BufferedBlockCipher | | public class BufferedBlockCipher (Code) | | A wrapper class that allows block ciphers to be used to process data in
a piecemeal fashion. The BufferedBlockCipher outputs a block only when the
buffer is full and more data is being added, or on a doFinal.
Note: in the case where the underlying cipher is either a CFB cipher or an
OFB one the last block may not be a multiple of the block size.
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| Method Summary | |
| public int | doFinal(byte[] out, int outOff)
Process the last block in the buffer.
Parameters:
out - the array the block currently being held is copied into.
Parameters:
outOff - the offset at which the copying starts. | | public int | getBlockSize()
return the blocksize for the underlying cipher. | | 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.
Parameters:
len - the length of the input. | | public BlockCipher | getUnderlyingCipher()
return the cipher this object wraps. | | public int | getUpdateOutputSize(int len)
return the size of the output buffer required for an update
an input of len bytes.
Parameters:
len - the length of the input. | | public void | init(boolean forEncryption, CipherParameters params)
initialise the cipher. | | public int | processByte(byte in, byte[] out, int outOff)
process a single byte, producing an output block if neccessary.
Parameters:
in - the input byte.
Parameters:
out - the space for any output that might be produced.
Parameters:
outOff - the offset from which the output will be copied. | | public int | processBytes(byte[] in, int inOff, int len, byte[] out, int outOff)
process an array of bytes, producing output if necessary.
Parameters:
in - the input byte array.
Parameters:
inOff - the offset at which the input data starts.
Parameters:
len - the number of bytes to be copied out of the input array.
Parameters:
out - the space for any output that might be produced.
Parameters:
outOff - the offset from which the output will be copied. | | public void | reset()
Reset the buffer and cipher. |
| bufOff | | protected int bufOff(Code) | | |
| forEncryption | | protected boolean forEncryption(Code) | | |
| partialBlockOkay | | protected boolean partialBlockOkay(Code) | | |
| pgpCFB | | protected boolean pgpCFB(Code) | | |
| BufferedBlockCipher | | protected BufferedBlockCipher()(Code) | | constructor for subclasses
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| BufferedBlockCipher | | public BufferedBlockCipher(BlockCipher cipher)(Code) | | Create a buffered block cipher without padding.
Parameters:
cipher - the underlying block cipher this buffering object wraps. |
| getBlockSize | | public int getBlockSize()(Code) | | return the blocksize for the underlying cipher.
the blocksize for the underlying cipher. |
| getOutputSize | | public int getOutputSize(int len)(Code) | | return the size of the output buffer required for an update plus a
doFinal with an input of len bytes.
Parameters:
len - the length of the input. the space required to accommodate a call to update and doFinalwith len bytes of input. |
| getUnderlyingCipher | | public BlockCipher getUnderlyingCipher()(Code) | | return the cipher this object wraps.
the cipher this object wraps. |
| getUpdateOutputSize | | public int getUpdateOutputSize(int len)(Code) | | return the size of the output buffer required for an update
an input of len bytes.
Parameters:
len - the length of the input. the space required to accommodate a call to updatewith len bytes of input. |
| init | | public void init(boolean forEncryption, CipherParameters params) throws IllegalArgumentException(Code) | | initialise the cipher.
Parameters:
forEncryption - if true the cipher is initialised forencryption, if false for decryption.
Parameters:
params - the key and other data required by the cipher.
exception:
IllegalArgumentException - if the params argument isinappropriate. |
| processByte | | public int processByte(byte in, byte[] out, int outOff) throws DataLengthException, IllegalStateException(Code) | | process a single byte, producing an output block if neccessary.
Parameters:
in - the input byte.
Parameters:
out - the space for any output that might be produced.
Parameters:
outOff - the offset from which the output will be copied. the number of output bytes copied to out.
exception:
DataLengthException - if there isn't enough space in out.
exception:
IllegalStateException - if the cipher isn't initialised. |
| processBytes | | public int processBytes(byte[] in, int inOff, int len, byte[] out, int outOff) throws DataLengthException, IllegalStateException(Code) | | process an array of bytes, producing output if necessary.
Parameters:
in - the input byte array.
Parameters:
inOff - the offset at which the input data starts.
Parameters:
len - the number of bytes to be copied out of the input array.
Parameters:
out - the space for any output that might be produced.
Parameters:
outOff - the offset from which the output will be copied. the number of output bytes copied to out.
exception:
DataLengthException - if there isn't enough space in out.
exception:
IllegalStateException - if the cipher isn't initialised. |
| reset | | public void reset()(Code) | | Reset the buffer and cipher. After resetting the object is in the same
state as it was after the last init (if there was one).
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