DKGLib

Implements on-chain logic of DKG protocol described in "Secure Distributed Key Generation for Discrete-Log Based Cryptosystems" by R. Gennaro, S. Jarecki, H. Krawczyk, and T. Rabin.

How it works

Library communicates with Cosmos Application called RandApp

Transactions sent by light blockchain client (copy of Cosmos CliContext and TxBuilder but with explicit configuration)

How to use

// CLIContext implements a typical CLI context created in SDK modules for
// transaction handling and queries
// DKGLib uses own Context with explicit configuration
cliCtx, err := cliCTX.NewCLIContext(chainID, nodeEndpoint, validatorName, genOnly, broadcastMode, vfrHome, height, trustNode, cliHome, "")
if err != nil {
    return nil, nil, err
}
cliCtx = cliCtx.WithCodec(cdc).WithAccountDecoder(cdc)
accNumber, err := cliCtx.GetAccountNumber(cliCtx.FromAddress)
if err != nil {
    return nil, nil, err
}
kb, err := keys.NewKeyBaseFromDir(cliCtx.Home)
if err != nil {
    return nil, nil, err
}
// TxBuilder implements tx generation
txBldr := authtxb.NewTxBuilder(utils.GetTxEncoder(cdc), accNumber, 0, 0, 0.0, false, cliCtx.Verifier.ChainID(), "", nil, nil).WithKeybase(kb)
if err := cliCtx.EnsureAccountExists(); err != nil {
    return nil, nil, fmt.Errorf("failed to find account: %v", err)
}

// Create DKGClient
oc := lib.NewOnChainDKG(cli, txBldr)

// Start new round
if err := oc.StartRound(types.NewValidatorSet(vals), pval, mockF, logger, 0); err != nil {
    panic(fmt.Sprintf("failed to start round: %v", err))
}

// Process blocks
tk := time.NewTicker(time.Second)
for {
    select {
    case <-tk.C:
        if err, ok := oc.ProcessBlock(); err != nil {
            panic(fmt.Sprintf("failed to start round: %v", err))
        } else if ok {
            wg.Done()
            return
        }
    }
}