tree ae9d19d22468c598f74b73c5cd26d7489a88a530
parent 8716f17961fd7760176bfaebc9b3827f70de6d9f
author Gilles Peskine <Gilles.Peskine@arm.com> 1638183699 +0100
committer Gilles Peskine <Gilles.Peskine@arm.com> 1638183699 +0100

mbedtls_ssl_handshake_params: use bytes for some small values

Replace bitfields mbedtls_ssl_handshake_params by bytes. This saves some
code size, and since the bitfields weren't group, this doesn't increase the
RAM usage.

Replace several ints that only store values in the range 0..255 by uint8_t.
This can increase or decrease the code size depending on the architecture
and on how the field is used. I chose changes that save code size on Arm
Thumb builds and will save more after field reordering.

Leave the bitfields in struct mbedtls_ssl_hs_buffer alone: replacing them by
uint8_t slightly increases the code size.

Results (arm-none-eabi-gcc 7.3.1, build_arm_none_eabi_gcc_m0plus build):
library/ssl_cli.o: 19759 -> 19763 (diff: -4)
library/ssl_srv.o: 20790 -> 20754 (diff: 36)
library/ssl_tls13_keys.o: 5153 -> 5133 (diff: 20)

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>