metainfo/hash.go | 8 ++++++++

diff --git a/metainfo/hash.go b/metainfo/hash.go
index 58c5b7cc185b950193cf1407b9ff8d9785e124e3..1c0a0ff8bf3baeb64bb8dbab22e84ad577e06ffc 100644
--- a/metainfo/hash.go
+++ b/metainfo/hash.go
@@ -1,6 +1,7 @@
 package metainfo
 
 import (
+	"crypto/sha1"
 	"encoding/hex"
 	"fmt"
 )
@@ -34,3 +35,10 @@ 		panic(n)
 	}
 	return
 }
+
+func HashBytes(b []byte) (ret Hash) {
+	hasher := sha1.New()
+	hasher.Write(b)
+	copy(ret[:], hasher.Sum(nil))
+	return
+}