Usage

wsmask -t|b -m|u [-k xxxxxxxx] -i input.bin -o output.bin

-t set opcode to text
-b set opcode to binary (default)
-m add websocket header and mask payload
-u unmask payload
-k xxxxx masking key used with -m option
-i input.bin
-o output.bin

You can use the following commands to convert each other.

$ ./wsmask -u -i sample/masked.bin -o unmasked.bin
$ ./wsmask -m -k deadbeef -i sample/unmasked.txt -o masked.bin