mdcrypt.py

printables = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!"#$%&\'()*+,-./:;?@[\\]^_`{|}~ \t\n\r\x0b\x0c'
bar = '_____________________________________\n'

def decrypt(text, key):
    keylen = len(key)
    keyPos = 0
    decrypted = ""
    for x in text:
        keyChr = key[keyPos]
        newChr = ord(x)
        newChr = chr((newChr - ord(keyChr)) % 255)
        decrypted += newChr
        keyPos += 1
        keyPos = keyPos % keylen
    return decrypted

def encrypt(text, key):
    keylen = len(key)
    keyPos = 0
    encrypted = ""
    for x in text:
        keyChr = key[keyPos]
        newChr = ord(x)
        newChr = chr((newChr + ord(keyChr)) % 255)
        encrypted += newChr
        keyPos += 1
        keyPos = keyPos % keylen
    return encrypted

def crack_key(raw, encrypted):
    key = ''
    index = 0
    index_old = None

    while index < len(raw):
        if index != index_old:
            index_old = index
        else:
            print('No key chars found :(')
            exit()
        for char in printables:
            decrypted = decrypt(encrypted, key + char)
            if raw[index] == decrypted[index]:
                key += char
                index += 1
                print(f'Key: {key}')

                if raw.strip() == decrypted.strip():
                    return key
                break

def main():
    raw = open('check.txt').read()
    encrypted = open('out.txt').read()

    print(bar)
    print('Starting Cracking!')
    print(bar)

    key = crack_key(raw, encrypted)
    print(bar)

    if key is not None:
        print(f'Key Found: {key}')
        encrypted = open('password.txt', 'r').read()
        decrypted = decrypt(encrypted, key)
        print(f'Decrypted: {decrypted.strip()}')
    else:
        print('Key Not Found :(')

    print(bar)


main()