add dpos consensus

[bytom/vapor.git] / blockchain / txbuilder / rawtxsig_witness.go

diff --git a/blockchain/txbuilder/rawtxsig_witness.go b/blockchain/txbuilder/rawtxsig_witness.go
index 53d3585..85caa94 100644 (file)
--- a/blockchain/txbuilder/rawtxsig_witness.go
+++ b/blockchain/txbuilder/rawtxsig_witness.go
@@ -6,6 +6,7 @@ import (
 
        log "github.com/sirupsen/logrus"
 
+       "github.com/vapor/crypto/ed25519/chainkd"
        chainjson "github.com/vapor/encoding/json"
 )
 
@@ -53,7 +54,35 @@ func (sw *RawTxSigWitness) sign(ctx context.Context, tpl *Template, index uint32
        return nil
 }
 
-func (sw RawTxSigWitness) materialize(args *[][]byte) error {
+func (sw *RawTxSigWitness) Sign(tpl *Template, index uint32, xprv chainkd.XPrv) error {
+       if len(sw.Sigs) < len(sw.Keys) {
+               // Each key in sw.Keys may produce a signature in sw.Sigs. Make
+               // sure there are enough slots in sw.Sigs and that we preserve any
+               // sigs already present.
+               newSigs := make([]chainjson.HexBytes, len(sw.Keys))
+               copy(newSigs, sw.Sigs)
+               sw.Sigs = newSigs
+       }
+       for i, keyID := range sw.Keys {
+               if len(sw.Sigs[i]) > 0 {
+                       // Already have a signature for this key
+                       continue
+               }
+               if keyID.XPub.String() != xprv.XPub().String() {
+                       continue
+               }
+               data := tpl.Hash(index).Byte32()
+               sigBytes := xprv.Sign(data[:])
+               // This break is ordered to avoid signing transaction successfully only once for a multiple-sign account
+               // that consist of different keys by the same password. Exit immediately when the signature is success,
+               // it means that only one signature will be successful in the loop for this multiple-sign account.
+               sw.Sigs[i] = sigBytes
+               break
+       }
+       return nil
+}
+
+func (sw RawTxSigWitness) Materialize(args *[][]byte) error {
        var nsigs int
        for i := 0; i < len(sw.Sigs) && nsigs < sw.Quorum; i++ {
                if len(sw.Sigs[i]) > 0 {