gistfile1.txt

from hashlib import sha1
import itertools
import time

chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
match = 'ff7b948953ac'
i = 1
start = time.time()
while True:
    gen = itertools.combinations_with_replacement(chars,i)
    for password in gen:
        tmp = ''.join(password).encode('utf-8')
        if sha1(tmp).hexdigest()[:12] == match:
            print('Match: {0}\n'.format(tmp))
            break
    print('{0} done ({1})'.format(i,str(time.time() - start)))
    start = time.time()
    i += 1