problema2.py

from pbkdf2 import PBKDF2
import base64

password_hash = b"AJeaF8lqg6tG24CAAJT6GbRwBi3GafdU5XnWnhxwIjTxo/q1yc1cnJa2PCplxUF3Rg=="
password = b"123456"

# оригинальный Соль
origin_salt = base64.b64decode(password_hash)[1:16]
print(base64.b64encode(origin_salt))
# > l5oXyWqDq0bbgIAAlPoZ

# оригинальный буфер
buffer1 = base64.b64decode(password_hash)[17:]
print(base64.b64encode(buffer1))
# > cAYtxmn3VOV51p4ccCI08aP6tcnNXJyWtjwqZcVBd0Y=

current_password_hash = PBKDF2(password, origin_salt)

# Соль с нового хеша
print(base64.b64encode(current_password_hash._PBKDF2__salt))
# > l5oXyWqDq0bbgIAAlPoZ

# Буфер с нового хеша
print(base64.b64encode(current_password_hash.read(49)[17:]))
# > 2n+kU1j80wyp+czeQRiqK5DiVPsg52zG7AfpUNJCleo=