def share_and_recover(num_players, reconstruction_threshold, secret, end):
max_secret_length = len(secret)
players = test_authenticated_rss.get_ids(num_players)
robust_shares = rss.share_authenticated_secret(players, reconstruction_threshold, max_secret_length, secret)
shares = {player: share for (player, share) in robust_shares.items()[:end]}
return rss.reconstruct_unauthenticated_secret(num_players, max_secret_length, shares)
def corrupt_and_recover(robust_shares, num_players, end, num_corrupt):
max_secret_length = len(secret)
shares_subset = {player: share for (player, share) in robust_shares.items()[:end]}
corrupters = {player: rss._deserialize_robust_share(share) for player, share in shares_subset.items()[:num_corrupt]}
# corrupt share data
for player, share_dict in corrupters.items():
share_dict["share"] /= 4
shares = test_authenticated_rss.combine_testing_dictionaries(shares_subset, test_authenticated_rss.jsonify_dict(corrupters))
return rss.reconstruct_unauthenticated_secret(num_players, max_secret_length, shares)
def verify(shares_map, test_secret, total_shares):
"""
Check to see if the unauthenticated Shamir recovery of shares_map results in test_secret
Args:
shares_map: a map of player_id to the share assigned to that player in call to share
test_secret: a potential secret to check of the same size as the originally shared secret
total_shares: the original number of shares created
Returns True if the shares_map successfully recovers test_secret
"""
try:
return test_secret == rss.reconstruct_unauthenticated_secret(total_shares, len(test_secret), shares_map)
except:
return False