/
key.go
142 lines (122 loc) · 2.95 KB
/
key.go
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package main
import (
"context"
"crypto/sha512"
"crypto/x509"
"encoding/pem"
"errors"
"github.com/MixinNetwork/mixin/common"
"github.com/MixinNetwork/mixin/crypto"
edm "github.com/MixinNetwork/mixin/crypto/edwards25519"
"github.com/fox-one/mint-withdraw"
log "github.com/sirupsen/logrus"
)
// Key key
type Key struct {
SpendPub *crypto.Key
View *crypto.Key
CoSigners []*CoSigner
}
// NewKey new key
func NewKey(spendPub, viewPriv string, sigKey string, apiBases ...string) (*Key, error) {
b, _ := pem.Decode([]byte(sigKey))
if b == nil {
return nil, errors.New("invalid sig key")
}
pk, err := x509.ParsePKCS1PrivateKey(b.Bytes)
if err != nil {
return nil, err
}
k := &Key{}
k.SpendPub, err = decodeKey(spendPub)
if err != nil {
return nil, err
}
if viewPriv != "" {
k.View, err = decodeKey(viewPriv)
if err != nil {
return nil, err
}
} else {
key := k.SpendPub.DeterministicHashDerive()
k.View = &key
}
k.CoSigners = make([]*CoSigner, len(apiBases))
for idx, api := range apiBases {
k.CoSigners[idx] = NewCosigner(api, pk)
}
return k, nil
}
// VerifyOutputs verify ouputs
func (k Key) VerifyOutputs(t *mint.Transaction) ([]int, error) {
var outputs = make([]int, 0, len(t.Outputs))
for idx, o := range t.Outputs {
for _, key := range o.Keys {
if crypto.ViewGhostOutputKey(&key, k.View, &o.Mask, uint64(idx)).String() == k.SpendPub.String() {
outputs = append(outputs, idx)
break
}
}
}
return outputs, nil
}
func (k Key) challenge(P *crypto.Key, message []byte, Rs ...*crypto.Key) [32]byte {
var hramDigest [64]byte
var hramDigestReduced [32]byte
var R *crypto.Key
for _, r := range Rs {
if R == nil {
R = r
} else {
R = crypto.KeyAddPub(R, r)
}
}
h := sha512.New()
h.Write(R[:])
h.Write(P[:])
h.Write(message)
h.Sum(hramDigest[:0])
edm.ScReduce(&hramDigestReduced, &hramDigest)
return hramDigestReduced
}
// Sign sign transaction, only for transaction, not for mint/deposit
func (k Key) Sign(out *common.Transaction, t *mint.Transaction) (*common.VersionedTransaction, error) {
signed := out.AsLatestVersion()
if len(signed.Inputs) == 0 {
log.Println("sign with no input")
return nil, nil
}
for idx := range out.Inputs {
var sR *crypto.Key
var randoms = make([]*crypto.Key, len(k.CoSigners))
for idx, s := range k.CoSigners {
r, err := s.RandomKey(context.Background())
if err != nil {
return nil, err
}
randoms[idx] = r
if sR == nil {
sR = r
} else {
sR = crypto.KeyAddPub(sR, r)
}
}
var response *[32]byte
for _, s := range k.CoSigners {
resp, err := s.Sign(context.Background(), signed.Transaction, idx, randoms)
if err != nil {
return nil, err
}
if response == nil {
response = resp
} else {
edm.ScAdd(response, response, resp)
}
}
var sig crypto.Signature
copy(sig[:], sR[:])
copy(sig[32:], response[:])
signed.Signatures = append(signed.Signatures, []crypto.Signature{sig})
}
return signed, nil
}