Insomnihack Drinks

insomnihack.py

import os

import random
import base64
import requests
import string

SEARCHSP = list("_" + string.printable[:-6])

PAD = string.ascii_lowercase + "!§$%&()=?-:;#'+*<>|"

MAX_LEN = 40

for c in PAD:
    if c in SEARCHSP:
        SEARCHSP.remove(c)

def gen_pad(l):
    a = random.randint(0, len(PAD)-l)
    return PAD[a:a+l]

def convert_to_hex(p):
    return base64.b64decode("".join(p.split("\n")[2:-3])).hex()

def get_enc(recipient, drink):
    r=requests.post('http://localhost:5000/generateEncryptedVoucher',json={'recipientName': recipient, 'drink': drink}) 
    return r.text


def get_uncompressed_len(PREFIX):
    while True:
        l_high_ent = []
        for i in range(20):
            l_high_ent.append(convert_to_hex(get_enc(PREFIX + gen_pad(MAX_LEN - len(PREFIX)), "beer")))

        len_ct = len(l_high_ent[0])
        for p in l_high_ent:
            if len(p) != len_ct:
                break
        else:
            break
    return len_ct

KNOWN = "||G1MME_B33R_"
len_ct = get_uncompressed_len(KNOWN)
print("Ciphertext len without compression: ", len_ct)


num = 0
for _ in range(26):
    for c in string.ascii_uppercase + "_0123456789":
        pw = KNOWN + c + PAD[:MAX_LEN - len(KNOWN) - 1]
        test = convert_to_hex(get_enc(pw, "beer"))
        num += 1
        if len(test) < len_ct:
            len_ct = len(test)
            print(len(test))
            KNOWN += c
            print(KNOWN)
            continue

print(len(test))