Solution to problem 5 part 1 in Python

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David Doblas Jiménez 2022-03-01 10:01:00 +01:00
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# --- Day 5: How About a Nice Game of Chess? ---
# You are faced with a security door designed by Easter Bunny engineers that
# seem to have acquired most of their security knowledge by watching hacking
# movies.
# The eight-character password for the door is generated one character at a
# time by finding the MD5 hash of some Door ID (your puzzle input) and an
# increasing integer index (starting with 0).
# A hash indicates the next character in the password if its hexadecimal
# representation starts with five zeroes. If it does, the sixth character in
# the hash is the next character of the password.
# For example, if the Door ID is abc:
# The first index which produces a hash that starts with five zeroes is
# 3231929, which we find by hashing abc3231929; the sixth character of the
# hash, and thus the first character of the password, is 1.
# 5017308 produces the next interesting hash, which starts with
# 000008f82..., so the second character of the password is 8.
# The third time a hash starts with five zeroes is for abc5278568,
# discovering the character f.
# In this example, after continuing this search a total of eight times, the
# password is 18f47a30.
# Given the actual Door ID, what is the password?
# Your puzzle input is abbhdwsy.
from hashlib import md5
_input = "abbhdwsy"
def part_1() -> None:
passwd = []
end = "9" * len(_input)
for num in range(int(end)):
testing = _input + str(num)
result = md5(testing.encode()).hexdigest()
if result.startswith("0" * 5):
passwd.append(result[5])
if len(passwd) == 8:
print(f"The password is {''.join(passwd)}")
break
if __name__ == "__main__":
part_1()