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Speed up instantiation of Gaston with Theta component #326

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Speed up instantiation of Gaston with Theta component #326

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31 changes: 30 additions & 1 deletion claasp/components/theta_gaston_component.py
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Original file line number Diff line number Diff line change
@@ -1,3 +1,6 @@
import os
import pickle
from typing import Any

# ****************************************************************************
# Copyright 2023 Technology Innovation Institute
Expand All @@ -22,11 +25,37 @@
from claasp.component import linear_layer_to_binary_matrix
from claasp.components.linear_layer_component import LinearLayer

# Global matrix cache
_cached_matrices: dict[str, Any] = {}

# File to persist the matrix cache
THIS_DIR = os.path.dirname(__file__)
ROOT_DIR = os.path.abspath(os.path.join(THIS_DIR, ".."))
CACHE_DIR = os.path.join(ROOT_DIR, "ciphers", "permutations")
os.makedirs(CACHE_DIR, exist_ok=True)

def _matrix_cache_path(cipher_id):
return os.path.join(CACHE_DIR, f"gaston_theta_{cipher_id}.pkl")

class ThetaGaston(LinearLayer):
def __init__(self, current_round_number, current_round_number_of_components,
input_id_links, input_bit_positions, output_bit_size, rotation_amounts_parameter):
binary_matrix = linear_layer_to_binary_matrix(THETA_GASTON, output_bit_size, output_bit_size, [rotation_amounts_parameter])

matrix_id = "_".join(str(p) for p in rotation_amounts_parameter)
if matrix_id in _cached_matrices:
binary_matrix = _cached_matrices[matrix_id]
else:
path = _matrix_cache_path(matrix_id)
if os.path.exists(path):
with open(path, "rb") as f:
binary_matrix = pickle.load(f)
else:
binary_matrix = linear_layer_to_binary_matrix(
THETA_GASTON, output_bit_size, output_bit_size, [rotation_amounts_parameter])
with open(path, "wb") as f:
pickle.dump(binary_matrix, f)

_cached_matrices[matrix_id] = binary_matrix
description = list(binary_matrix.transpose())
super().__init__(current_round_number, current_round_number_of_components,
input_id_links, input_bit_positions, output_bit_size, description)
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