From 420d9560625be602670c8323d2a6e44a3ce2d4d9 Mon Sep 17 00:00:00 2001
From: Leonard Lyubich <leonard@nspcc.ru>
Date: Tue, 29 Sep 2020 15:18:52 +0300
Subject: [PATCH] [#162] sdk/object: Detach header verification functions

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
---
 pkg/object/fmt.go | 34 ++++++++++++++++++++++++----------
 1 file changed, 24 insertions(+), 10 deletions(-)

diff --git a/pkg/object/fmt.go b/pkg/object/fmt.go
index 61a08b6..04cb5f4 100644
--- a/pkg/object/fmt.go
+++ b/pkg/object/fmt.go
@@ -124,10 +124,8 @@ func VerifyIDSignature(obj *Object) error {
 	)
 }
 
-// SetVerificationFields calculates and sets all verification fields of the object.
-func SetVerificationFields(key *ecdsa.PrivateKey, obj *RawObject) error {
-	CalculateAndSetPayloadChecksum(obj)
-
+// SetIDWithSignature sets object identifier and signature.
+func SetIDWithSignature(key *ecdsa.PrivateKey, obj *RawObject) error {
 	if err := CalculateAndSetID(obj); err != nil {
 		return errors.Wrap(err, "could not set identifier")
 	}
@@ -139,14 +137,17 @@ func SetVerificationFields(key *ecdsa.PrivateKey, obj *RawObject) error {
 	return nil
 }
 
+// SetVerificationFields calculates and sets all verification fields of the object.
+func SetVerificationFields(key *ecdsa.PrivateKey, obj *RawObject) error {
+	CalculateAndSetPayloadChecksum(obj)
+
+	return SetIDWithSignature(key, obj)
+}
+
 // CheckVerificationFields checks all verification fields of the object.
 func CheckVerificationFields(obj *Object) error {
-	if err := VerifyIDSignature(obj); err != nil {
-		return errors.Wrap(err, "invalid signature")
-	}
-
-	if err := VerifyID(obj); err != nil {
-		return errors.Wrap(err, "invalid identifier")
+	if err := CheckHeaderVerificationFields(obj); err != nil {
+		return errors.Wrap(err, "invalid header structure")
 	}
 
 	if err := VerifyPayloadChecksum(obj); err != nil {
@@ -155,3 +156,16 @@ func CheckVerificationFields(obj *Object) error {
 
 	return nil
 }
+
+// CheckHeaderVerificationFields checks all verification fields except payload.
+func CheckHeaderVerificationFields(obj *Object) error {
+	if err := VerifyIDSignature(obj); err != nil {
+		return errors.Wrap(err, "invalid signature")
+	}
+
+	if err := VerifyID(obj); err != nil {
+		return errors.Wrap(err, "invalid identifier")
+	}
+
+	return nil
+}