Testing a known char as a part of decrypt key

test.py

import sys
import string

data = 'e7225ea6c31ec63e843f53e3da21e104c5611c80c82cea02e7225ea6c31dea13d12955b7c819e604cc165da0d927e115e83e5db1df27e117855b'.decode('hex')

data = bytearray(data)

chrset = string.ascii_lowercase+string.digits+string.ascii_uppercase+'!'+'\x00'+':'+' '+'_'+'@'
ofs = 0
i = 0xa4
r = ''
n = ~i
for k in range(0,len(data)-ofs,8):
	r += chr((data[k+ofs] ^ i) & 255)
	r += chr((data[k+ofs+1] ^ n) & 255)
	r += '    '
if all(c in chrset for c in r):
	print hex(i), r#, r.encode('hex')