Initial commit
make Sbox and InvSbox static const array
change ROI
add mouse selection functionality without exception handler
mouse selection exceptions are handled
change kernel size from 25 to 51
now support roi selection in irregular shape
add eraser tool
fix click functionality
use MD5 of password as key for AES
little revision
revise README
revise README again
compact codes
use OpenCV inpaint, change eraser shape to circle