gnostr-xor

#!/usr/bin/env python3
from hashlib import sha256
import subprocess
import struct
import sys
import os
program = sys.argv[0]
def get_arg(index):
    try:
        sys.argv[index]
    except IndexError:
        return ''
    else:
        return sys.argv[index]
arg1 = get_arg(1)
arg2 = get_arg(2)
arg3 = get_arg(3)
arg4 = get_arg(4)
if not arg1:
  arg1 = '0000000000000000000000000000000000000000000000000000000000000000'
  ## print(arg1);
if not arg2:
  arg2 = '0000000000000000000000000000000000000000000000000000000000000000'
  ## print(arg2);
## if not arg3:
##   arg3 = '0000000000000000000000000000000000000000000000000000000000000000'
##   ## print(arg3);
def change_to_be_hex(s):
    return int(s,base=16)
def xor_two_str(str1,str2):
    a = change_to_be_hex(str1)
    b = change_to_be_hex(str2)
    return hex(a ^ b)
## gnostr_blockheight = "gnostr-blockheight"
## blockheight        = subprocess.call(gnostr_blockheight, stdout=open(os.devnull, 'wb'))
## blockheight_hash   = sha256(str(blockheight).encode('utf-8')).hexdigest()
## print(xor_two_str(blockheight_hash, key))
if arg1 and arg2:
  print(xor_two_str(arg1, arg2)[2:])
## if arg1 and arg3:
##   print(xor_two_str(arg1, arg3))
## if arg2 and arg3:
##   print(xor_two_str(arg2, arg3))


## TODO:test vectors
## gnostr-xor \
## $(gnostr-sha256 e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855) \
## $(gnostr-sha256 0000000000000000000000000000000000000000000000000000000000000000)
##                 add77469e0dddf203c91ba4450576317737b1b61590239f94fcc2f011a13f7b3
## gnostr-xor \
## $(gnostr-sha256 0000000000000000000000000000000000000000000000000000000000000000) \
## $(gnostr-sha256 e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855)
##                 add77469e0dddf203c91ba4450576317737b1b61590239f94fcc2f011a13f7b3

## gnostr-xor \
## $(gnostr-sha256 0000000000000000000000004b825dc642cb6eb9a060e54bf8d69288fbee4904) \
## $(gnostr-sha256 0000000000000000000000000000000000000000000000000000000000000000)
##                 d4aa5c4bb8931d39ff40bf060f37aaf4af5c358fdeab2b2277ef9045d5c1ae0f

## gnostr-xor \
## $(gnostr-sha256 0000000000000000000000000000000000000000000000000000000000000000) \
## $(gnostr-sha256 0000000000000000000000004b825dc642cb6eb9a060e54bf8d69288fbee4904)
##                 d4aa5c4bb8931d39ff40bf060f37aaf4af5c358fdeab2b2277ef9045d5c1ae0f

## gnostr-xor \
## $(gnostr-sha256 0000000000000000000000004b825dc642cb6eb9a060e54bf8d69288fbee4904) \
## $(gnostr-sha256 d4aa5c4bb8931d39ff40bf060f37aaf4af5c358fdeab2b2277ef9045d5c1ae0f)
##                 53fea41583e086149820bd57567b1998209677822e40e1e4b3b8201c80d74e91

## gnostr-xor \
## $(gnostr-sha256 d4aa5c4bb8931d39ff40bf060f37aaf4af5c358fdeab2b2277ef9045d5c1ae0f) \
## $(gnostr-sha256 0000000000000000000000004b825dc642cb6eb9a060e54bf8d69288fbee4904)
##                 53fea41583e086149820bd57567b1998209677822e40e1e4b3b8201c80d74e91