[#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>

refs/test/generate.go

@@ -1,7 +1,8 @@
 package refstest
 
 import (
-	"math/rand"
+	crand "crypto/rand"
+	"crypto/sha256"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/refs"
 )
@@ -21,7 +22,10 @@ func GenerateOwnerID(empty bool) *refs.OwnerID {
 	m := new(refs.OwnerID)
 
 	if !empty {
-		m.SetValue([]byte{1, 2, 3})
+		id := make([]byte, 25)
+		_, _ = crand.Read(id)
+
+		m.SetValue(id)
 	}
 
 	return m
@@ -42,7 +46,10 @@ func GenerateObjectID(empty bool) *refs.ObjectID {
 	m := new(refs.ObjectID)
 
 	if !empty {
-		m.SetValue([]byte{1, 2, 3})
+		id := make([]byte, sha256.Size)
+		_, _ = crand.Read(id)
+
+		m.SetValue(id)
 	}
 
 	return m
@@ -65,7 +72,10 @@ func GenerateContainerID(empty bool) *refs.ContainerID {
 	m := new(refs.ContainerID)
 
 	if !empty {
-		m.SetValue([]byte{1, 2, 3})
+		id := make([]byte, sha256.Size)
+		_, _ = crand.Read(id)
+
+		m.SetValue(id)
 	}
 
 	return m
@@ -88,9 +98,15 @@ func GenerateSignature(empty bool) *refs.Signature {
 	m := new(refs.Signature)
 
 	if !empty {
-		m.SetKey([]byte{1})
-		m.SetSign([]byte{2})
-		m.SetScheme(refs.SignatureScheme(rand.Int31() % 3))
+		key := make([]byte, 33)
+		_, _ = crand.Read(key)
+
+		sign := make([]byte, 65)
+		_, _ = crand.Read(sign)
+
+		m.SetScheme(refs.ECDSA_SHA512)
+		m.SetKey(key)
+		m.SetSign(sign)
 	}
 
 	return m
@@ -100,8 +116,11 @@ func GenerateChecksum(empty bool) *refs.Checksum {
 	m := new(refs.Checksum)
 
 	if !empty {
-		m.SetType(1)
-		m.SetSum([]byte{1, 2, 3})
+		cs := make([]byte, sha256.Size)
+		_, _ = crand.Read(cs)
+
+		m.SetType(refs.SHA256)
+		m.SetSum(cs)
 	}
 
 	return m