DTLS1_CCS_HEADER_LENGTH
if (!ossl_assert(s->d1->w_msg_hdr.msg_len + ((s->version == DTLS1_BAD_VER) ? 3 : DTLS1_CCS_HEADER_LENGTH)
header_length = DTLS1_CCS_HEADER_LENGTH;
&& remain != DTLS1_CCS_HEADER_LENGTH + 1)
&& remain != DTLS1_CCS_HEADER_LENGTH - 1)) {