added leaf hash helper

1 files changed, 8 insertions, 0 deletions

diff --git a/types/util.go b/types/util.go
index dc8ccba..3cd7dfa 100644
--- a/types/util.go
+++ b/types/util.go
@@ -4,6 +4,10 @@ import (
 	"crypto/sha256"
 )
 
+const (
+	LeafHashPrefix = 0x00
+)
+
 func Hash(buf []byte) *[HashSize]byte {
 	var ret [HashSize]byte
 	hash := sha256.New()
@@ -11,3 +15,7 @@ func Hash(buf []byte) *[HashSize]byte {
 	copy(ret[:], hash.Sum(nil))
 	return &ret
 }
+
+func HashLeaf(buf []byte) *[HashSize]byte {
+	return Hash(append([]byte{LeafHashPrefix}, buf...))
+}