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Signed-off-by: Leonard Lyubich <leonard@morphbits.io>

Author: cthulhu-rider

checksum/checksum.go

@@ -24,7 +24,7 @@ type Checksum struct {
 
 // Type represents the enumeration
 // of checksum types.
-type Type uint32
+type Type int32
 
 const (
 	Unknown      Type = iota // Deprecated: use 0 instead.
@@ -99,6 +99,9 @@ func NewFromData(typ Type, data []byte) (Checksum, error) {
 //
 // See also [Checksum.ProtoMessage].
 func (c *Checksum) FromProtoMessage(m *refs.Checksum) error {
+	if m.Type < 0 {
+		return fmt.Errorf("negative type %d", m.Type)
+	}
 	if len(m.Sum) == 0 {
 		return errors.New("missing value")
 	}

checksum/checksum_test.go

@@ -63,15 +63,15 @@ func TestChecksumDecodingFailures(t *testing.T) {
 }
 
 func TestNew(t *testing.T) {
-	typ := checksum.Type(rand.Uint32())
+	typ := checksum.Type(rand.Int31())
 	val := make([]byte, 128)
 	//nolint:staticcheck
 	rand.Read(val)
 	cs := checksum.New(typ, val)
 	require.Equal(t, typ, cs.Type())
 	require.Equal(t, val, cs.Value())
 
-	otherTyp := checksum.Type(rand.Uint32())
+	otherTyp := checksum.Type(rand.Int31())
 	otherVal := make([]byte, 128)
 	//nolint:staticcheck
 	rand.Read(otherVal)
@@ -155,7 +155,7 @@ func TestNewFromHash(t *testing.T) {
 	h.Write([]byte("Hello, world!"))
 	hb := []byte{32, 94, 4, 138}
 
-	typ := checksum.Type(rand.Uint32())
+	typ := checksum.Type(rand.Int31())
 	cs := checksum.NewFromHash(typ, h)
 	require.Equal(t, typ, cs.Type())
 	require.Equal(t, hb, cs.Value())