randomgen.speck128.SPECK128.seed¶

SPECK128.seed(seed=None, counter=None, key=None)¶

Seed the generator

This method is called when SPECK128 is initialized. It can be called again to re-Seed the generator For details, see SPECK128.

Parameters:¶

seed=None¶

Entropy initializing the pseudo-random number generator. Can be an integer in [0, 2**256), a SeedSequence instance or None (the default). If seed is None, then data is read from /dev/urandom (or the Windows analog) if available. If unavailable, a hash of the time and process ID is used.

counter=None¶

Integer in [0,2**128) containing the counter position or a 2-element array of uint64 containing the counter

key=None¶

Integer in [0,2**256) containing the key or a 4-element array of uint64 containing the key

Raises:¶

ValueError – If values are out of range for the PRNG or If seed and key are both set.

Notes

The two representation of the counter and key are related through array[i] = (value // 2**(64*i)) % 2**64.