rlp: fix check for canonical byte array size

Decoding did not reject byte arrays of length one with a single element
b where 55 < b < 128. Such byte arrays must be rejected because
they must be encoded as the single byte b instead.

1 files changed, 3 insertions, 3 deletions

diff --git a/rlp/decode.go b/rlp/decode.go
index f17690522..cc402fc94 100644
--- a/rlp/decode.go
+++ b/rlp/decode.go
@@ -361,7 +361,7 @@ func decodeByteArray(s *Stream, val reflect.Value) error {
 			return err
 		}
 		// Reject cases where single byte encoding should have been used.
-		if size == 1 && slice[0] < 56 {
+		if size == 1 && slice[0] < 128 {
 			return wrapStreamError(ErrCanonSize, val.Type())
 		}
 	case List:
@@ -623,7 +623,7 @@ func (s *Stream) Bytes() ([]byte, error) {
 		if err = s.readFull(b); err != nil {
 			return nil, err
 		}
-		if size == 1 && b[0] < 56 {
+		if size == 1 && b[0] < 128 {
 			return nil, ErrCanonSize
 		}
 		return b, nil
@@ -687,7 +687,7 @@ func (s *Stream) uint(maxbits int) (uint64, error) {
 			return 0, ErrCanonInt
 		case err != nil:
 			return 0, err
-		case size > 0 && v < 56:
+		case size > 0 && v < 128:
 			return 0, ErrCanonSize
 		default:
 			return v, nil