postmerge

types/signable.go

@@ -0,0 +1,30 @@
+package types
+
+import (
+	"bytes"
+	"io"
+
+	. "github.com/tendermint/go-common"
+	"github.com/tendermint/go-merkle"
+)
+
+// Signable is an interface for all signable things.
+// It typically removes signatures before serializing.
+type Signable interface {
+	WriteSignBytes(chainID string, w io.Writer, n *int, err *error)
+}
+
+// SignBytes is a convenience method for getting the bytes to sign of a Signable.
+func SignBytes(chainID string, o Signable) []byte {
+	buf, n, err := new(bytes.Buffer), new(int), new(error)
+	o.WriteSignBytes(chainID, buf, n, err)
+	if *err != nil {
+		PanicCrisis(err)
+	}
+	return buf.Bytes()
+}
+
+// HashSignBytes is a convenience method for getting the hash of the bytes of a signable
+func HashSignBytes(chainID string, o Signable) []byte {
+	return merkle.SimpleHashFromBinary(SignBytes(chainID, o))
+}