| java.lang.Object
 org.bouncycastle.crypto.BufferedBlockCipher
org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher
| PaddedBufferedBlockCipher | | public class PaddedBufferedBlockCipher extends BufferedBlockCipher (Code) | | A wrapper class that allows block ciphers to be used to process data in
a piecemeal fashion with padding. The PaddedBufferedBlockCipher
outputs a block only when the buffer is full and more data is being added,
or on a doFinal (unless the current block in the buffer is a pad block).
The default padding mechanism used is the one outlined in PKCS5/PKCS7.
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| Method Summary | |
| public int | doFinal(byte[] out, int outOff)
Process the last block in the buffer. | | public int | getOutputSize(int len)
return the minimum 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 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. |
| PaddedBufferedBlockCipher | | public PaddedBufferedBlockCipher(BlockCipher cipher, BlockCipherPadding padding)(Code) | | Create a buffered block cipher with the desired padding.
Parameters:
cipher - the underlying block cipher this buffering object wraps.
Parameters:
padding - the padding type. |
| PaddedBufferedBlockCipher | | public PaddedBufferedBlockCipher(BlockCipher cipher)(Code) | | Create a buffered block cipher PKCS7 padding
Parameters:
cipher - the underlying block cipher this buffering object wraps. |
| doFinal | | public int doFinal(byte[] out, int outOff) throws DataLengthException, IllegalStateException, InvalidCipherTextException(Code) | | Process the last block in the buffer. If the buffer is currently
full and padding needs to be added a call to doFinal will produce
2 * getBlockSize() bytes.
Parameters:
out - the array the block currently being held is copied into.
Parameters:
outOff - the offset at which the copying starts. the number of output bytes copied to out.
exception:
DataLengthException - if there is insufficient space in out forthe output or we are decrypting and the input is not block size aligned.
exception:
IllegalStateException - if the underlying cipher is notinitialised.
exception:
InvalidCipherTextException - if padding is expected and not found. |
| getOutputSize | | public int getOutputSize(int len)(Code) | | return the minimum 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. |
| 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. |
| Methods inherited from org.bouncycastle.crypto.BufferedBlockCipher | public int doFinal(byte[] out, int outOff) throws DataLengthException, IllegalStateException, InvalidCipherTextException(Code)(Java Doc)
public int getBlockSize()(Code)(Java Doc)
public int getOutputSize(int len)(Code)(Java Doc)
public BlockCipher getUnderlyingCipher()(Code)(Java Doc)
public int getUpdateOutputSize(int len)(Code)(Java Doc)
public void init(boolean forEncryption, CipherParameters params) throws IllegalArgumentException(Code)(Java Doc)
public int processByte(byte in, byte[] out, int outOff) throws DataLengthException, IllegalStateException(Code)(Java Doc)
public int processBytes(byte[] in, int inOff, int len, byte[] out, int outOff) throws DataLengthException, IllegalStateException(Code)(Java Doc)
public void reset()(Code)(Java Doc)
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