Class BufferedBlockCipher

    • Field Detail

      • buf

        protected byte[] buf
      • bufOff

        protected int bufOff
      • forEncryption

        protected boolean forEncryption
      • partialBlockOkay

        protected boolean partialBlockOkay
      • pgpCFB

        protected boolean pgpCFB
    • Constructor Detail

      • BufferedBlockCipher

        protected BufferedBlockCipher()
        constructor for subclasses
      • BufferedBlockCipher

        public BufferedBlockCipher​(BlockCipher cipher)
        Create a buffered block cipher without padding.
        Parameters:
        cipher - the underlying block cipher this buffering object wraps.
    • Method Detail

      • getUnderlyingCipher

        public BlockCipher getUnderlyingCipher()
        return the cipher this object wraps.
        Returns:
        the cipher this object wraps.
      • init

        public void init​(boolean forEncryption,
                         CipherParameters params)
                  throws IllegalArgumentException
        initialise the cipher.
        Parameters:
        forEncryption - if true the cipher is initialised for encryption, if false for decryption.
        params - the key and other data required by the cipher.
        Throws:
        IllegalArgumentException - if the params argument is inappropriate.
      • getBlockSize

        public int getBlockSize()
        return the blocksize for the underlying cipher.
        Returns:
        the blocksize for the underlying cipher.
      • getUpdateOutputSize

        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.
        Returns:
        the space required to accommodate a call to update with len bytes of input.
      • getOutputSize

        public int getOutputSize​(int length)
        return the size of the output buffer required for an update plus a doFinal with an input of 'length' bytes.
        Parameters:
        length - the length of the input.
        Returns:
        the space required to accommodate a call to update and doFinal with 'length' 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 necessary.
        Parameters:
        in - the input byte.
        out - the space for any output that might be produced.
        outOff - the offset from which the output will be copied.
        Returns:
        the number of output bytes copied to out.
        Throws:
        DataLengthException - if there isn't enough space in out.
        IllegalStateException - if the cipher isn't initialised.
      • 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.
        Parameters:
        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.
        Returns:
        the number of output bytes copied to out.
        Throws:
        DataLengthException - if there isn't enough space in out.
        IllegalStateException - if the cipher isn't initialised.
      • reset

        public void reset()
        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).