randgen.py

import random
import time
import hashlib

def find(s):
    seed = s

    random.seed(seed, version=2)
    logs = []

    while True:
        rnd = random.random()

        hash = hashlib.sha256(str(rnd).encode()).hexdigest()
        flag = f"SNYK{{{hash}}}"

        if "5bc" in hash:
            #with open("./flag", "w") as f:
            #    f.write(flag)
            break
        else:
            logs.append(f"Bad random value: {rnd}")
            if len(logs) == 1:
                if logs[0] != 'Bad random value: 0.3719072557403058':
                    return

    logs.append("Flag created 🎉")
    return "\n".join(logs).strip()

s = round(time.time())
#s = 1632886000
#s = 1631321000
#s = 1631183000
#s = 1624583000
print("Start ", s)

def solve(start):
    s = start
    stop = start - 10000
    while True:
        logs = find(s)
        #if s % 1_000 == 0:
        #    print(s)
        if logs == problog:
            print("FOUND", s)
            exit()
        s = s - 1
        if s < stop:
            return

if __name__ == "__main__":
    problog = open("log.txt").read().strip()
    first_line = problog.splitlines()[0]
    print(first_line)

    from concurrent.futures import ThreadPoolExecutor

    tpe = ThreadPoolExecutor(max_workers=2000)

    tpe.map(solve, range(s, 0, -10000))