INNER CODE UNIT · Python

COMMITMENT_SIZE

opentimestamps/opentimestamps-server · otsserver/calendar.py:52

    COMMITMENT_SIZE = 4 + 32 + HMAC_SIZE

    def __init__(self, path):
        self.read_fd = open(path, "rb")

    def __getitem__(self, idx):
        self.read_fd.seek(idx * self.COMMITMENT_SIZE)
        commitment = self.read_fd.read(self.COMMITMENT_SIZE)

        if len(commitment) == self.COMMITMENT_SIZE:
            # Strip off HMAC if not present
            if commitment[-HMAC_SIZE:] == b'\x00'*HMAC_SIZE:
                commitment = commitment[:-HMAC_SIZE]
            return commitment
        else:
            raise KeyError()

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