Consensus-sodium

Small library for multiple parties to estbalish a shared random number. Even if you are the only honest party.

This version is not necessarily compatible with consensus which uses libtomcrypt. But both now use the blake2b-256 hash function.

Algorithim

1. All parties pick a secret random number
2. Each party shares a hash of that random number
3. Each party reveals the random number
4. Each party ensures the hashes matches the revealed number
5. All the random numbers are bitwise XOR'd to produce a random number

Dependencies

• libsodium

Build

gcc -o bin/consensus_test -lsodium src/consensus.c src/test.c 

Usage

See src/test.c, each party only generates one secret, disseminating the hash, and then the secret is left up to the user. For most applications the secret should be processed for example hashed.