Module nonce

Extract a timestamp from the given nonce string

Parameters:

• nonce_string (str) - the nonce from which to extract the timestamp

Returns: (int, str)

A pair of a Unix timestamp and the salt characters

Raises:

• ValueError - if the nonce does not start with a correctly formatted time string

Is the timestamp that is part of the specified nonce string within the allowed clock-skew of the current time?

Parameters:

• nonce_string (str) - The nonce that is being checked
• allowed_skew (int) - How many seconds should be allowed for completing the request, allowing for clock skew.
• now (int) - The current time, as a Unix timestamp

Returns: bool

Whether the timestamp is correctly formatted and within the allowed skew of the current time.

Generate a nonce with the current timestamp

Parameters:

• when (int) - Unix timestamp representing the issue time of the nonce. Defaults to the current time.

Returns: str

A string that should be usable as a one-way nonce