Kasey's review #2

Author: potuz

encoding/bytesutil/hex.go

@@ -22,10 +22,17 @@ func IsHex(b []byte) bool {
 // DecodeHexWithLength takes a string and a length in bytes,
 // and validates whether the string is a hex and has the correct length.
 func DecodeHexWithLength(s string, length int) ([]byte, error) {
-	if len(s) != 2*length+2 {
-		return nil, fmt.Errorf("%s is not length %d bytes", s, length)
+	if len(s) > 2*length+2 {
+		return nil, fmt.Errorf("%s is greather than length %d bytes", s, length)
 	}
-	return hexutil.Decode(s)
+	bytes, err := hexutil.Decode(s)
+	if err != nil {
+		return nil, errors.Wrap(err, fmt.Sprintf("%s is not a valid hex", s))
+	}
+	if len(bytes) != length {
+		return nil, fmt.Errorf("length of %s is not %d bytes", s, length)
+	}
+	return bytes, nil
 }
 
 // DecodeHexWithMaxLength takes a string and a length in bytes,