fix: Fix blobHash collision

contracts/wasm/corecontracts/test/core_blob_test.go

@@ -14,7 +14,7 @@ import (
 )
 
 // this is the expected blob hash for key0/val0 key1/val1
-const expectedBlobHash = "0x5fec3bfc701d80bdf75e337cb3dcb401c2423d15fc17a74d5b644dae143118b1"
+const expectedBlobHash = "0xc3a428b98c8a0385da56aceaa36d82032fb22fe372bb78b9ec9993a24acb1d35"
 
 func setupBlob(t *testing.T) *wasmsolo.SoloContext {
 	ctx := setup(t)
@@ -81,7 +81,7 @@ func TestListBlobs(t *testing.T) {
 	fStore.Params.Blobs().GetBytes("key1").SetValue([]byte("_val1"))
 	fStore.Func.Post()
 	require.NoError(t, ctx.Err)
-	expectedHash := "0x462af4abe5977f4dd985a0a097705925b9fa6c033c9d931c1e2171f710693462"
+	expectedHash := "0xc5b04323dd23505d1c6af7dfdf3ef3ea102c516ad787fcc1ec4ccee39168af54"
 	require.Equal(t, expectedHash, fStore.Results.Hash().Value().String())
 
 	fList := coreblob.ScFuncs.ListBlobs(ctx)

packages/vm/core/blob/internal.go

@@ -28,8 +28,8 @@ func mustGetBlobHash(fields dict.Dict) (hashing.HashValue, []kv.Key, [][]byte) {
 	for _, k := range sorted {
 		v := fields.Get(k)
 		values = append(values, v)
-		all = append(all, v)
 		all = append(all, []byte(k))
+		all = append(all, v)
 	}
 	return hashing.HashData(all...), sorted, values
 }

packages/vm/core/blob/internal_test.go

@@ -0,0 +1,26 @@
+package blob
+
+import (
+	"encoding/hex"
+	"testing"
+
+	"github.com/iotaledger/wasp/packages/kv/dict"
+	"github.com/stretchr/testify/require"
+)
+
+func TestMustGetBlobHash(t *testing.T) {
+	fields := dict.Dict{
+		"field1": []byte("value1"),
+		"field2": []byte("value2"),
+	}
+
+	h, keys, values := mustGetBlobHash(fields)
+	for i, k := range keys {
+		require.Equal(t, fields[k], values[i])
+	}
+
+	// blobHash = hash(fieldName1 || binaryChunk1 || fieldName2 || binaryChunk2 || ... || fieldNameN || binaryChunkN)
+	resHash, err := hex.DecodeString("d45cd5dee59f83b3334c1acce7a38f12280d264aada764ed0d65e8a88c4693b0")
+	require.NoError(t, err)
+	require.Equal(t, resHash, h.Bytes())
+}