From 9cad88a6875fdc66f66a274ee217002d90f58f8f Mon Sep 17 00:00:00 2001
From: mrjoelkamp <joel.kamp@docker.com>
Date: Thu, 8 Aug 2024 13:06:56 -0500
Subject: [PATCH] fix: EmptyConfigImage digest

---
 pkg/attestation/attestation.go | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/pkg/attestation/attestation.go b/pkg/attestation/attestation.go
index 306cf1b..c7050dc 100644
--- a/pkg/attestation/attestation.go
+++ b/pkg/attestation/attestation.go
@@ -1,6 +1,7 @@
 package attestation
 
 import (
+	"bytes"
 	"context"
 	"encoding/json"
 	"fmt"
@@ -329,3 +330,12 @@ func (i *EmptyConfigImage) RawManifest() ([]byte, error) {
 	}
 	return json.Marshal(mf)
 }
+
+func (i *EmptyConfigImage) Digest() (v1.Hash, error) {
+	mb, err := i.RawManifest()
+	if err != nil {
+		return v1.Hash{}, err
+	}
+	digest, _, err := v1.SHA256(bytes.NewReader(mb))
+	return digest, err
+}