ceremonyclient/nekryptology/pkg/tecdsa/dkls/v0/params.go

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2023-07-05 05:32:28 +00:00
//
// Copyright Coinbase, Inc. All Rights Reserved.
//
// SPDX-License-Identifier: Apache-2.0
//
package v0
import (
"crypto/elliptic"
"math/big"
"golang.org/x/crypto/sha3"
"source.quilibrium.com/quilibrium/monorepo/nekryptology/pkg/core/curves"
)
const (
kappa = 256 // Computational security parameter.
s = 80 // statistical security parameter. does this have to be so high?! i've seen 40. // TODO: investigate why 80
kappaOT = kappa + s
)
type Params struct {
Curve elliptic.Curve
Scalar curves.EcScalar
Generator *curves.EcPoint
gadget [2*kappa + 2*s]*big.Int
}
// NewParams receives an implementation of the curve and scalar interfaces and
// sets the parameters needed for DKG and Threshold ECDSA of DKLS.
func NewParams(curve elliptic.Curve, scalar curves.EcScalar) (*Params, error) {
params := &Params{Curve: curve, Scalar: scalar}
params.Generator = &curves.EcPoint{Curve: curve, X: curve.Params().Gx, Y: curve.Params().Gy}
for i := 0; i < kappa; i++ {
params.gadget[i] = new(big.Int).Lsh(big.NewInt(1), uint(i))
}
shake := sha3.NewCShake256(nil, []byte("Play as a championship team."))
for i := kappa; i < 2*kappa+2*s; i++ {
var err error
bytes := [32]byte{}
if _, err = shake.Read(bytes[:]); err != nil {
return nil, err
}
params.gadget[i] = new(big.Int).SetBytes(bytes[:])
}
return params, nil
}