# extmod/modtrezorcrypto/modtrezorcrypto-pbkdf2.h
def update(self, iterations: int) -> None:
    '''
    Update a PBKDF2 context
    '''

# extmod/modtrezorcrypto/modtrezorcrypto-pbkdf2.h
def key(self) -> bytes:
    '''
    Retreive derived key
    '''