[#106] test: Generate correct data for tests

Some tests are using invalid data that do not meet the requirements of the
FrostFS protocol, e.g.
- Container/Object IDs aren't 32 bytes long
- Signature key and sign have invalid length
- Split IDs aren't valid UUIDv4
and etc.

Signed-off-by: Aleksey Savchuk <a.savchuk@yadro.com>

object/test/generate.go

@@ -1,6 +1,7 @@
 package objecttest
 
 import (
+	crand "crypto/rand"
 	"math/rand"
 	"time"
 
@@ -59,7 +60,10 @@ func generateSplitHeader(empty, withPar bool) *object.SplitHeader {
 	m := new(object.SplitHeader)
 
 	if !empty {
-		m.SetSplitID([]byte{1, 3, 5})
+		id := make([]byte, 16)
+		_, _ = crand.Read(id)
+
+		m.SetSplitID(id)
 		m.SetParent(refstest.GenerateObjectID(false))
 		m.SetPrevious(refstest.GenerateObjectID(false))
 		m.SetChildren(refstest.GenerateObjectIDs(false))
@@ -91,7 +95,10 @@ func GenerateECHeader(empty bool) *object.ECHeader {
 
 	if !empty {
 		ech.Parent = refstest.GenerateObjectID(empty)
-		ech.ParentSplitID = []byte{1, 2, 3}
+
+		ech.ParentSplitID = make([]byte, 16)
+		_, _ = crand.Read(ech.ParentSplitID)
+
 		ech.ParentSplitParentID = refstest.GenerateObjectID(empty)
 		ech.ParentAttributes = GenerateAttributes(empty)
 		ech.Index = 0
@@ -150,7 +157,10 @@ func GenerateSplitInfo(empty bool) *object.SplitInfo {
 	m := new(object.SplitInfo)
 
 	if !empty {
-		m.SetSplitID([]byte("splitID"))
+		id := make([]byte, 16)
+		_, _ = crand.Read(id)
+
+		m.SetSplitID(id)
 		m.SetLastPart(refstest.GenerateObjectID(false))
 		m.SetLink(refstest.GenerateObjectID(false))
 	}
@@ -627,7 +637,10 @@ func GenerateGetRangeHashResponseBody(empty bool) *object.GetRangeHashResponseBo
 
 	if !empty {
 		m.SetType(678)
-		m.SetHashList([][]byte{{1}, {2}})
+		m.SetHashList([][]byte{
+			refstest.GenerateChecksum(false).GetSum(),
+			refstest.GenerateChecksum(false).GetSum(),
+		})
 	}
 
 	return m