Add check for lengths over 65535 in mbedtls_asn1_write_len()
diff --git a/include/mbedtls/asn1write.h b/include/mbedtls/asn1write.h
index 73ff32b..4d2917e 100644
--- a/include/mbedtls/asn1write.h
+++ b/include/mbedtls/asn1write.h
@@ -40,6 +40,8 @@
* \param start start of the buffer (for bounds-checking)
* \param len the length to write
*
+ * \note lengths over 65535 are not supported at the moment
+ *
* \return the length written or a negative error code
*/
int mbedtls_asn1_write_len( unsigned char **p, unsigned char *start, size_t len );