`ggmpc.shamir`¶

Module Contents¶

`split`(curve, s, t[, n, I])	Perform Shamir sharing on the secret s to the degree t - 1 split n
`combine`(curve, shares)	Reconstitute a secret from a dictionary of shares. The number of shares must

ggmpc.shamir.split(curve, s, t, n=None, I=None)¶

Perform Shamir sharing on the secret s to the degree t - 1 split n ways. The split secret requires t shares to be reconstructed.

Parameters:

s (int) – Secret to split.
t (int) – Share threshold required to reconstruct secret.
n (int, optional) – Total number of shares to split secret into.
I (list, optional) – Indices used for each party. Defaults to range(1, 1 + n).

Returns:

Dictionary of shares. Each key is an int in the range 1<=x<=n representing that share’s free term.

Rtype dict:

ggmpc.shamir.combine(curve, shares)¶

Reconstitute a secret from a dictionary of shares. The number of shares must be equal to t to reconstitute the original secret.

Parameters:: shares (dict) – Dictionary of shares. Each key is the free term of the share.
Returns:: Reconstituted secret.
Return type:: int