XOR cat - a command line tool to XOR a data stream with a given key:
$ echo -n 'Hello world' | xcat -n 0x03
Kfool#tlqog
The key may be a number...
$ echo -n AAAAAAAAAAAA | xcat -n 42
kkkkkkkkkkkk
...or a hexadecimal string...
$ echo -n AAAAAAAAAAAA | xcat -x 2a2b2c2d2f
kjmlnkjmlnkj
...or a file...
$ xcat -f key.bin encrypted.bin > decrypted.bin
...or a counter...
$ xcat -c 0xef /dev/zero | xxd -p | head -n 2
eff0f1f2f3f4f5f6f7f8f9fafbfcfdfeff000102030405060708090a0b0c
0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a
...or a counter with a specific step:
$ xcat -c 0x1f,-3 /dev/zero | xxd -p | head -n 2
1f1c191613100d0a070401fefbf8f5f2efece9e6e3e0dddad7d4d1cecbc8
c5c2bfbcb9b6b3b0adaaa7a4a19e9b9895928f8c898683807d7a7774716e
$ xcat -h
usage: xcat [-h] (-f FILE | -x HEXSTRING | -n NUMBER | -a STRING | -c START)
[FILE]
xor a stream of data with a given key
positional arguments:
FILE input filename [default: use stdin]
optional arguments:
-h, --help show this help message and exit
-f FILE create key from binary file
-x HEXSTRING create key from hexadecimal string
-n NUMBER create key from little-endian number
-a STRING create key from ASCII string
-c START[,STEP] create 256-byte key by counting from START