I believe you're talking about an implementation of Shamir's Secret Sharing Scheme. http://point-at-infinity.org/ssss/ should do what you want.
- Chiraag -- ಚಿರಾಗ್ ನಟರಾಜ್ Pronouns: he/him/his
publickey - mailinglist@chiraag.me - b0c8d720.asc
Description: application/pgp-keys
signature.asc
Description: OpenPGP digital signature
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