add basic tasks for learners

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Christoph J. Scherr 2023-09-04 17:44:39 +02:00
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# Tasks for beginners
This document contains some tasks for Python beginners. It does not aim to teach general
programming techniques, only how to use Python.
## MD5 Hashchecker
- [ ] Hash `foobar19` with the md5 hashing algorithm
- Hints:
- Use Pythons `hashlib`.
- Your hashing function does not take strings for input, only raw data (bytes).
- You need to explicitly tell your hash to actually process the input.
- When printing your results, the result may be interpreted as data for characters.
You want the numeric value of the result in Hexadecimal.
- Results:
- ||MD5 of `foobar19` is `fa5c65d5438f849387d3fdda2be4dd65`||
- [ ] 1. rotate the base string `foobar` with numbers from 0 to 999999 like this:
1. `foobar000000`
2. `foobar000001`
3. `foobar000002`
...
999999. `foobar999999`
2. Get the MD5 hash value for each of those
3. How many of these start with `00`?
- Hints:
- Use a for loop to do the thing X times
- Use Pythons string formatting to put the numbers and string together
- Use Options for the `%d` Placeholder to get 0 to be displayed as `000000`
- do the same hashing as in the previous task
- After hashing, check if your current hash matches the search.
Print it if that is the case to see if the match is a false positive.
- Increment a number on each match. The value of that number after the loop is how many
Hashes start with `00` for this task.
- Testvectors, the last 5 matches:
```text
999384 | 009671fd23fa783df1fff63516e5d115
999751 | 00ec2ade58f75c44b7300294497f7fb1
999844 | 009cfd7949b577a3311d9db3ee49c15d
999852 | 006fe04f7d3f710f93d3e6324506154a
999902 | 00c063364ddffa1bdf338dfcf0319424
```
- Results:
- ||3889 matches for the search parameters.||
- [ ] Continuing from the previous task, what is the earliest value for `foobarXXXXXX` (where `X`
is a substitute for the iterating numbers) where the hash starts with `0000`?
- Hints:
- Stop on the earliest match.
- Results:
- || 021820 | 00001c9393b83c8da0db478687211d1d ||

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import hashlib
import sys
BASE: str = "foobar"
MAX = 1000000
SEARCH = "00"
results: list[str] = []
count = 0
for i in range(0, MAX):
num: str = ("%06d" % i)
current = BASE + num
results.append(hashlib.md5(current.encode()).digest().hex())
for res in results:
res = hashlib.md5(current.encode()).digest().hex()
if SEARCH == res[:2]:
count += 1
print(res)
print("%06d | %s" % (i, res))
print(f"\nFound %d digests matching the search" % count)