BSsidesSF CTF 2017 "delphi-status" crypto 250

delphi.py

# From BsidesSF CTF 2017

import itertools
import requests
import sys
from binascii import hexlify, unhexlify

uh = unhexlify
h = hexlify

ct = uh("928afe4ffecdea9ed22847dcd2d47d674921a12fbdc42d3150d30e13b65d36b46677f7735d09b572b4df1ce68100bf8893fb4c919f6cddda087691132873b93de0d2cac3ff374d7f8db3524dbf91655b0111b05883c16f5e23a898e923174dd05f7ef949dc3bdd145c698c907c4a411d")

host = "http://delphi-status-e606c556.ctf.bsidessf.net"

r = requests.get("{}/execute/{}".format(host, h(ct).decode()))
print(r.content)
print(h(r.content))

def xorstring(s1, s2):
    return bytes([(a ^ b) for a, b in zip(s1, s2)])

ct = uh("fe9b534deb6fba8c33d22ebe0cdfa53ebc108fd1b6f649d93ee5b1ba0ee80c39")
iv = ct[:5]
iv = xorstring(b"netst", iv)
iv = xorstring(b"pg *;", iv)
ct = iv + ct[5:]
print(len(ct))
r = requests.get("{}/execute/{}".format(host, h(ct).decode()))
print(r.content)
print(h(r.content))