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factory.go
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factory.go
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//go:build !js && !wasm
// +build !js,!wasm
package zcncrypto
import (
"encoding/hex"
"encoding/json"
"fmt"
"github.com/0chain/errors"
)
// NewSignatureScheme creates an instance for using signature functions
func NewSignatureScheme(sigScheme string) SignatureScheme {
switch sigScheme {
case "ed25519":
return NewED255190chainScheme()
case "bls0chain":
return NewHerumiScheme()
default:
panic(fmt.Sprintf("unknown signature scheme: %v", sigScheme))
}
}
// UnmarshalThresholdSignatureSchemes unmarshal SignatureScheme from json string
func UnmarshalSignatureSchemes(sigScheme string, obj interface{}) ([]SignatureScheme, error) {
switch sigScheme {
case "bls0chain":
if obj == nil {
return nil, nil
}
buf, err := json.Marshal(obj)
if err != nil {
return nil, err
}
var list []*HerumiScheme
if err := json.Unmarshal(buf, &list); err != nil {
return nil, err
}
ss := make([]SignatureScheme, len(list))
for i, v := range list {
// bls.ID from json
err = v.SetID(v.Ids)
if err != nil {
return nil, err
}
ss[i] = v
}
return ss, nil
default:
panic(fmt.Sprintf("unknown signature scheme: %v", sigScheme))
}
}
//GenerateThresholdKeyShares given a signature scheme will generate threshold sig keys
func GenerateThresholdKeyShares(t, n int, originalKey SignatureScheme) ([]SignatureScheme, error) {
b0ss, ok := originalKey.(*HerumiScheme)
if !ok {
return nil, errors.New("bls0_generate_threshold_key_shares", "Invalid encryption scheme")
}
b0original := BlsSignerInstance.NewSecretKey()
b0PrivateKeyBytes, err := b0ss.GetPrivateKeyAsByteArray()
if err != nil {
return nil, err
}
err = b0original.SetLittleEndian(b0PrivateKeyBytes)
if err != nil {
return nil, err
}
polynomial, err := b0original.GetMasterSecretKey(t)
if err != nil {
return nil, err
}
var shares []SignatureScheme
for i := 1; i <= n; i++ {
id := BlsSignerInstance.NewID()
err = id.SetDecString(fmt.Sprint(i))
if err != nil {
return nil, err
}
sk := BlsSignerInstance.NewSecretKey()
err = sk.Set(polynomial, id)
if err != nil {
return nil, err
}
share := &HerumiScheme{}
share.PrivateKey = hex.EncodeToString(sk.GetLittleEndian())
share.PublicKey = sk.GetPublicKey().SerializeToHexStr()
share.id = id
share.Ids = id.GetHexString()
shares = append(shares, share)
}
return shares, nil
}