Shamira Changeset - b9f1f39cd7af

Changeset - b9f1f39cd7af

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Laman - 4 years ago 2020-04-13 13:53:07

check for non-unique shares on joining

2 files changed with 6 insertions and 0 deletions:

src/condensed.py

src/shamira.py

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src/condensed.py

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@@ @@ -57,12 +57,15 @@ class SException(Exception): pass @@
 def reconstruct_raw(*shares):
 	"""Tries to recover the secret from its shares.
 	:param shares: (((int) i, (bytes) share), ...)
 	:return: (bytes) reconstructed secret. Too few shares returns garbage."""
 	if len({x for (x, _) in shares}) < len(shares):
 		raise SException("Found a non-unique share. Please check your inputs.")
 	secret_len = len(shares[0][1])
 	res = [None]*secret_len
 	for i in range(secret_len):
 		points = [(x, s[i]) for (x, s) in shares]
 		res[i] = (get_constant_coef(*points))
 	return bytes(res)

src/shamira.py

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@@ @@ -37,12 +37,15 @@ def generate_raw(secret, k, n): @@
 def reconstruct_raw(*shares):
 	"""Tries to recover the secret from its shares.
 	:param shares: (((int) i, (bytes) share), ...)
 	:return: (bytes) reconstructed secret. Too few shares return garbage."""
 	if len({x for (x, _) in shares}) < len(shares):
 		raise MalformedShare("Found a non-unique share. Please check your inputs.")
 	secret_len = len(shares[0][1])
 	res = [None]*secret_len
 	for i in range(secret_len):
 		points = [(x, s[i]) for (x, s) in shares]
 		res[i] = (gf256.get_constant_coef(*points))
 	return bytes(res)

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