Python MD5 decrypt.

md5_hash_decrypt.py

# -*- coding: utf-8 -*-

import hashlib
import sys
import time

# Using: ./hash.py hashcode
# For example: ./hash.py 9743a66f914cc249efca164485a19c5c

def timing(f):
    def wrap(*args):
        time1 = time.time()
        ret = f(*args)
        time2 = time.time()
        print '%s Time: %0.3f s' % (f.func_name, float(time2 - time1))
        return ret

    return wrap


@timing
def decryptMD5(testHash):
    s = []

    while True:
        m = hashlib.md5()

        for c in s:
            m.update(chr(c))

        hash = m.hexdigest()

        if hash == testHash:
            return ''.join([chr(c) for c in s])

        wrapped = True

        for i in range(0, len(s)):
            s[i] = (s[i] + 1) % 256

            if s[i] != 0:
                wrapped = False
                break

        if wrapped:
            s.append(0)

print(decryptMD5(sys.argv[1]))

Make it run in python 3 is actually pretty easy, you just need to wrap the print string in parenthesis and then correct the line 29 encoding the Unicode character in m.update(chr(c)) into bytes, it has to be m.update(chr(c).encode("utf-8")) instead, because the update() method in the md5 object expects byte characters, and finally in the decorator function timing(f): to get the function name, you need to use the __name__ attribute instead of func_name if it is even relevant to you to know the function name, if not, just remove %s at the beginning of the string in the print function as well as f.func_name, , if you only care about the time it took the script to decrypt the hash.

Though I suggest you should learn first some of python before even thinking on running anyone else's scripts, so you'll be able to see how the script works and even solve these problems by yourselves that are actually QUITE basic.

The next code works in python 3.10, so it should work in python 3.8 or 3.6 just fine ...

`

import hashlib
import sys
import time

def timing(f):
    def wrap(*args):
        time1 = time.time()
        ret = f(*args)
        time2 = time.time()
        print('%s Time: %0.3f s' % (f.__name__, float(time2 - time1)))
        return ret

    return wrap


@timing
def decryptMD5(testHash):
    s = []

    while True:
        m = hashlib.md5()
        for c in s:
            m.update(chr(c).encode("utf-8"))

        hash = m.hexdigest()
        if hash == testHash:
            return ''.join([chr(c) for c in s])

        wrapped = True
        for i in range(0, len(s)):
            s[i] = (s[i] + 1) % 256

            if s[i] != 0:
                wrapped = False
                break

        if wrapped:
            s.append(0)

def main() -> None:
    if len(sys.argv) != 2:
        print("[-] Please especify an hash to decrypt!")
        print(f"[*] Usage: python3 {sys.argv[0]} <MD5 HASH>")
        sys.exit(-1)

    print("[*] Decrypting hash!")
    print(decryptMD5(sys.argv[1]))
    print("[+] Hash decrypted! :)")

if __name__ == '__main__':
    main()

`

Hi! Nice work! There is an way to add hint? Suppose we know part of the hash like 0192023a7bbd73250516f069df18b500 (admin123) and I know "min1". I think that maybe it is something more efficient and decreases the decryption time.