Shared secret

This module provides utilities to dissociate and recombine Shamir "shared secrets", for which some parts (shards) can be lost without preventing the reconstruction of the whole secret.

wacryptolib.shared_secret.split_secret_into_shards(secret, *, shard_count, threshold_count)

Generate a Shamir shared secret of shard_count subkeys, with threshold_count of them required to recompute the initial bytestring.

Parameters:

• secret (bytes) -- bytestring to separate as shards, whatever its length

• shard_count (int) -- the number of shards to be created for the secret

• threshold_count (int) -- the minimal number of shards needed to recombine the key

Return type:

list

Returns:

list of full bytestring shards

wacryptolib.shared_secret.recombine_secret_from_shards(shards)

Reconstruct a secret from list of Shamir shards

Parameters:

shards (Sequence) -- list of k full-length shards (k being exactly the threshold of this shared secret)

Return type:

bytes

Returns:

the key reconstructed as bytes