Package org.bouncycastle.crypto.paddings

Interface BlockCipherPadding

    • Method Summary

      All Methods Instance Methods Abstract Methods 
      Modifier and Type Method Description
      int addPadding​(byte[] in, int inOff)
      add the pad bytes to the passed in block, returning the number of bytes added.
      java.lang.String getPaddingName()
      Return the name of the algorithm the cipher implements.
      void init​(java.security.SecureRandom random)
      Initialise the padder.
      int padCount​(byte[] in)
      return the number of pad bytes present in the block.

    • Method Detail

      • init

        void init​(java.security.SecureRandom random)
   throws java.lang.IllegalArgumentException
        Initialise the padder.
        Parameters:
        random - the source of randomness for the padding, if required.
        Throws:
        java.lang.IllegalArgumentException

      • getPaddingName

        java.lang.String getPaddingName()
        Return the name of the algorithm the cipher implements.
        Returns:
        the name of the algorithm the cipher implements.

      • addPadding

        int addPadding​(byte[] in,
               int inOff)
        add the pad bytes to the passed in block, returning the number of bytes added.

        Note: this assumes that the last block of plain text is always passed to it inside in. i.e. if inOff is zero, indicating the entire block is to be overwritten with padding the value of in should be the same as the last block of plain text. The reason for this is that some modes such as "trailing bit compliment" base the padding on the last byte of plain text.