/*
* How many bytes will we add to frame buffer for a given
* set of crypto options?
*/
void
crypto_adjust_frame_parameters(struct frame *frame,
const struct key_type* kt,
bool cipher_defined,
bool use_iv,
bool packet_id,
bool packet_id_long_form)
{
size_t crypto_overhead = 0;
if (packet_id)
crypto_overhead += packet_id_size (packet_id_long_form);
if (cipher_defined)
{
if (use_iv)
crypto_overhead += cipher_kt_iv_size (kt->cipher);
/* extra block required by cipher_ctx_update() */
crypto_overhead += cipher_kt_block_size (kt->cipher);
}
crypto_overhead += kt->hmac_length;
frame_add_to_extra_frame (frame, crypto_overhead);
msg(D_MTU_DEBUG, "%s: Adjusting frame parameters for crypto by %zu bytes",
__func__, crypto_overhead);
}
void
tls_crypt_adjust_frame_parameters(struct frame *frame)
{
frame_add_to_extra_frame(frame, tls_crypt_buf_overhead());
msg(D_MTU_DEBUG, "%s: Adjusting frame parameters for tls-crypt by %i bytes",
__func__, tls_crypt_buf_overhead());
}
/*
* How many bytes will we add to frame buffer for a given
* set of crypto options?
*/
void
crypto_adjust_frame_parameters(struct frame *frame,
const struct key_type* kt,
bool cipher_defined,
bool use_iv,
bool packet_id,
bool packet_id_long_form)
{
frame_add_to_extra_frame (frame,
(packet_id ? packet_id_size (packet_id_long_form) : 0) +
((cipher_defined && use_iv) ? cipher_kt_iv_size (kt->cipher) : 0) +
(cipher_defined ? cipher_kt_block_size (kt->cipher) : 0) + /* worst case padding expansion */
kt->hmac_length);
}
void
comp_add_to_extra_frame(struct frame *frame)
{
/* Leave room for our one-byte compressed/didn't-compress prefix byte. */
frame_add_to_extra_frame (frame, COMP_PREFIX_LEN);
}
/* add to extra_frame the maximum number of bytes we will need for reliable_ack_write */
void
reliable_ack_adjust_frame_parameters (struct frame* frame, int max)
{
frame_add_to_extra_frame (frame, ACK_SIZE (max));
}
