galois.GLFSR.reset(state: ArrayLike | None = None)

Resets the Galois LFSR state to the specified state.

Parameters
state: ArrayLike | None = None

The state vector \(S = [S_0, S_1, \dots, S_{n-2}, S_{n-1}]\). The default is None which corresponds to the initial state.

Examples

Step the Galois LFSR 10 steps to modify its state.

In [1]: c = galois.primitive_poly(7, 4); c
Out[1]: Poly(x^4 + x^2 + 3x + 5, GF(7))

In [2]: lfsr = galois.GLFSR(c.reverse()); lfsr
Out[2]: <Galois LFSR: f(x) = 5x^4 + 3x^3 + x^2 + 1 over GF(7)>

In [3]: lfsr.state
Out[3]: GF([1, 1, 1, 1], order=7)

In [4]: lfsr.step(10)
Out[4]: GF([1, 1, 0, 4, 6, 5, 3, 6, 1, 2], order=7)

In [5]: lfsr.state
Out[5]: GF([4, 3, 0, 1], order=7)

Reset the Galois LFSR state.

In [6]: lfsr.reset()

In [7]: lfsr.state
Out[7]: GF([1, 1, 1, 1], order=7)

Create an Galois LFSR and view its initial state.

In [8]: c = galois.primitive_poly(7, 4); c
Out[8]: Poly(x^4 + x^2 + 3x + 5, GF(7))

In [9]: lfsr = galois.GLFSR(c.reverse()); lfsr
Out[9]: <Galois LFSR: f(x) = 5x^4 + 3x^3 + x^2 + 1 over GF(7)>

In [10]: lfsr.state
Out[10]: GF([1, 1, 1, 1], order=7)

Reset the Galois LFSR state to a new state.

In [11]: lfsr.reset([1, 2, 3, 4])

In [12]: lfsr.state
Out[12]: GF([1, 2, 3, 4], order=7)
Last update: Jul 28, 2022