Fix ASN1_BIT_STRING decoding error

scapy/asn1/asn1.py

@@ -325,12 +325,14 @@ class ASN1_BIT_STRING(ASN1_Object):
             super(ASN1_Object, self).__setattr__(name, value)
     def __repr__(self):
         if len(self.val) <= 16:
-            return "<%s[%s] (%d unused bit%s)>" % (self.__dict__.get("name", self.__class__.__name__), self.val.decode(), self.unused_bits, "s" if self.unused_bits>1 else "")
+            v = plain_str(self.val)
+            return "<%s[%s] (%d unused bit%s)>" % (self.__dict__.get("name", self.__class__.__name__), v, self.unused_bits, "s" if self.unused_bits>1 else "")
         else:
             s = self.val_readable
             if len(s) > 20:
                 s = s[:10] + b"..." + s[-10:]
-            return "<%s[%s] (%d unused bit%s)>" % (self.__dict__.get("name", self.__class__.__name__), s.decode(), self.unused_bits, "s" if self.unused_bits>1 else "")
+            v = plain_str(self.val)
+            return "<%s[%s] (%d unused bit%s)>" % (self.__dict__.get("name", self.__class__.__name__), v, self.unused_bits, "s" if self.unused_bits>1 else "")
     def __str__(self):
         return self.val_readable
     def __bytes__(self):

test/regression.uts

@@ -777,6 +777,10 @@ a = ASN1_BIT_STRING("test", "value")
 a
 assert raw(a) == b'test'
 
+a = ASN1_BIT_STRING(b"\xff"*16, "value")
+a
+assert raw(a) == b'\xff'*16
+
 = ASN1 - ASN1_SEQUENCE
 a = ASN1_SEQUENCE([ASN1_Object(1), ASN1_Object(0)])
 assert a.strshow() == '# ASN1_SEQUENCE:\n  <ASN1_Object[1]>\n  <ASN1_Object[0]>\n'