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bls0chain_herumi.go
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bls0chain_herumi.go
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//go:build !js && !wasm
// +build !js,!wasm
package zcncrypto
import (
"bytes"
"encoding/hex"
"fmt"
"time"
"github.com/0chain/errors"
"github.com/tyler-smith/go-bip39"
"github.com/0chain/gosdk/core/encryption"
)
func init() {
}
// HerumiScheme - a signature scheme for BLS0Chain Signature
type HerumiScheme struct {
PublicKey string `json:"public_key"`
PrivateKey string `json:"private_key"`
Mnemonic string `json:"mnemonic"`
id ID
Ids string `json:"threshold_scheme_id"`
}
// NewHerumiScheme - create a MiraclScheme object
func NewHerumiScheme() *HerumiScheme {
return &HerumiScheme{
id: BlsSignerInstance.NewID(),
}
}
// GenerateKeys generate fresh keys
func (b0 *HerumiScheme) GenerateKeys() (*Wallet, error) {
return b0.generateKeys("0chain-client-split-key")
}
// GenerateKeysWithEth generate fresh keys based on eth wallet
func (b0 *HerumiScheme) GenerateKeysWithEth(mnemonic, password string) (*Wallet, error) {
if len(mnemonic) == 0 {
return nil, fmt.Errorf("Mnemonic phase is mandatory.")
}
b0.Mnemonic = mnemonic
_, err := bip39.NewSeedWithErrorChecking(b0.Mnemonic, password)
if err != nil {
return nil, fmt.Errorf("Wrong mnemonic phase.")
}
return b0.generateKeys(password)
}
// RecoverKeys recovery keys from mnemonic
func (b0 *HerumiScheme) RecoverKeys(mnemonic string) (*Wallet, error) {
if mnemonic == "" {
return nil, errors.New("recover_keys", "Set mnemonic key failed")
}
if b0.PublicKey != "" || b0.PrivateKey != "" {
return nil, errors.New("recover_keys", "Cannot recover when there are keys")
}
b0.Mnemonic = mnemonic
return b0.GenerateKeys()
}
func (b0 *HerumiScheme) GetMnemonic() string {
if b0 == nil {
return ""
}
return b0.Mnemonic
}
// SetPrivateKey set private key to sign
func (b0 *HerumiScheme) SetPrivateKey(privateKey string) error {
if b0.PublicKey != "" {
return errors.New("set_private_key", "cannot set private key when there is a public key")
}
if b0.PrivateKey != "" {
return errors.New("set_private_key", "private key already exists")
}
b0.PrivateKey = privateKey
//ToDo: b0.publicKey should be set here?
return nil
}
func (b0 *HerumiScheme) GetPrivateKey() string {
return b0.PrivateKey
}
func (b0 *HerumiScheme) SplitKeys(numSplits int) (*Wallet, error) {
if b0.PrivateKey == "" {
return nil, errors.New("split_keys", "primary private key not found")
}
primaryFr := BlsSignerInstance.NewFr()
primarySk := BlsSignerInstance.NewSecretKey()
err := primarySk.DeserializeHexStr(b0.PrivateKey)
if err != nil {
return nil, err
}
err = primaryFr.SetLittleEndian(primarySk.GetLittleEndian())
if err != nil {
return nil, err
}
// New Wallet
w := &Wallet{}
w.Keys = make([]KeyPair, numSplits)
sk := BlsSignerInstance.NewSecretKey()
for i := 0; i < numSplits-1; i++ {
tmpSk := BlsSignerInstance.NewSecretKey()
tmpSk.SetByCSPRNG()
w.Keys[i].PrivateKey = tmpSk.SerializeToHexStr()
pub := tmpSk.GetPublicKey()
w.Keys[i].PublicKey = pub.SerializeToHexStr()
sk.Add(tmpSk)
}
aggregateSk := BlsSignerInstance.NewFr()
err = aggregateSk.SetLittleEndian(sk.GetLittleEndian())
if err != nil {
return nil, err
}
//Subtract the aggregated private key from the primary private key to derive the last split private key
lastSk := BlsSignerInstance.NewFr()
BlsSignerInstance.FrSub(lastSk, primaryFr, aggregateSk)
// Last key
lastSecretKey := BlsSignerInstance.NewSecretKey()
err = lastSecretKey.SetLittleEndian(lastSk.Serialize())
if err != nil {
return nil, err
}
w.Keys[numSplits-1].PrivateKey = lastSecretKey.SerializeToHexStr()
w.Keys[numSplits-1].PublicKey = lastSecretKey.GetPublicKey().SerializeToHexStr()
// Generate client ID and public
w.ClientKey = primarySk.GetPublicKey().SerializeToHexStr()
w.ClientID = encryption.Hash(primarySk.GetPublicKey().Serialize())
w.Mnemonic = b0.Mnemonic
w.Version = CryptoVersion
w.DateCreated = time.Now().Format(time.RFC3339)
return w, nil
}
// Sign sign message
func (b0 *HerumiScheme) Sign(hash string) (string, error) {
sig, err := b0.rawSign(hash)
if err != nil {
return "", err
}
return sig.SerializeToHexStr(), nil
}
// SetPublicKey - implement interface
func (b0 *HerumiScheme) SetPublicKey(publicKey string) error {
if b0.PrivateKey != "" {
return errors.New("set_public_key", "cannot set public key when there is a private key")
}
if b0.PublicKey != "" {
return errors.New("set_public_key", "public key already exists")
}
b0.PublicKey = publicKey
return nil
}
// GetPublicKey - implement interface
func (b0 *HerumiScheme) GetPublicKey() string {
return b0.PublicKey
}
// Verify - implement interface
func (b0 *HerumiScheme) Verify(signature, msg string) (bool, error) {
if b0.PublicKey == "" {
return false, errors.New("verify", "public key does not exists for verification")
}
sig := BlsSignerInstance.NewSignature()
pk := BlsSignerInstance.NewPublicKey()
err := sig.DeserializeHexStr(signature)
if err != nil {
return false, err
}
rawHash, err := hex.DecodeString(msg)
if err != nil {
return false, err
}
if rawHash == nil {
return false, errors.New("verify", "failed hash while signing")
}
err = pk.DeserializeHexStr(b0.PublicKey)
if err != nil {
return false, err
}
return sig.Verify(pk, string(rawHash)), nil
}
func (b0 *HerumiScheme) Add(signature, msg string) (string, error) {
sign := BlsSignerInstance.NewSignature()
err := sign.DeserializeHexStr(signature)
if err != nil {
return "", err
}
signature1, err := b0.rawSign(msg)
if err != nil {
return "", errors.Wrap(err, "BLS signing failed")
}
sign.Add(signature1)
return sign.SerializeToHexStr(), nil
}
// GetPrivateKeyAsByteArray - converts private key into byte array
func (b0 *HerumiScheme) GetPrivateKeyAsByteArray() ([]byte, error) {
if len(b0.PrivateKey) == 0 {
return nil, errors.New("get_private_key_as_byte_array", "cannot convert empty private key to byte array")
}
privateKeyBytes, err := hex.DecodeString(b0.PrivateKey)
if err != nil {
return nil, err
}
return privateKeyBytes, nil
}
// SetID sets ID in HexString format
func (b0 *HerumiScheme) SetID(id string) error {
if b0.id == nil {
b0.id = BlsSignerInstance.NewID()
}
b0.Ids = id
return b0.id.SetHexString(id)
}
// GetID gets ID in hex string format
func (b0 *HerumiScheme) GetID() string {
if b0.id == nil {
b0.id = BlsSignerInstance.NewID()
}
return b0.id.GetHexString()
}
func (b0 *HerumiScheme) generateKeys(password string) (*Wallet, error) {
// Check for recovery
if len(b0.Mnemonic) == 0 {
entropy, err := bip39.NewEntropy(256)
if err != nil {
return nil, errors.Wrap(err, "Generating entropy failed")
}
b0.Mnemonic, err = bip39.NewMnemonic(entropy)
if err != nil {
return nil, errors.Wrap(err, "Generating mnemonic failed")
}
}
// Generate a Bip32 HD wallet for the mnemonic and a user supplied password
seed := bip39.NewSeed(b0.Mnemonic, password)
r := bytes.NewReader(seed)
BlsSignerInstance.SetRandFunc(r)
// New Wallet
w := &Wallet{}
w.Keys = make([]KeyPair, 1)
// Generate pair
sk := BlsSignerInstance.NewSecretKey()
sk.SetByCSPRNG()
w.Keys[0].PrivateKey = sk.SerializeToHexStr()
pub := sk.GetPublicKey()
w.Keys[0].PublicKey = pub.SerializeToHexStr()
b0.PrivateKey = w.Keys[0].PrivateKey
b0.PublicKey = w.Keys[0].PublicKey
w.ClientKey = w.Keys[0].PublicKey
w.ClientID = encryption.Hash(pub.Serialize())
w.Mnemonic = b0.Mnemonic
w.Version = CryptoVersion
w.DateCreated = time.Now().Format(time.RFC3339)
// Revert the Random function to default
BlsSignerInstance.SetRandFunc(nil)
return w, nil
}
func (b0 *HerumiScheme) rawSign(hash string) (Signature, error) {
sk := BlsSignerInstance.NewSecretKey()
if b0.PrivateKey == "" {
return nil, errors.New("raw_sign", "private key does not exists for signing")
}
rawHash, err := hex.DecodeString(hash)
if err != nil {
return nil, err
}
if rawHash == nil {
return nil, errors.New("raw_sign", "failed hash while signing")
}
sk.SetByCSPRNG()
err = sk.DeserializeHexStr(b0.PrivateKey)
if err != nil {
return nil, err
}
sig := sk.Sign(string(rawHash))
return sig, nil
}