addPadding abstract method
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 data
. i.e.
if offset
is zero, indicating the entire block is to be overwritten with padding the value of
data
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.
Implementation
int addPadding(Uint8List data, int offset);