Naming scheme for crypto tuning options

[gilles-peskine-arm]

The goal of this issue is to define a naming scheme for configuration options that tune how cryptography is performed. This excludes cryptographic mechanism selection (PSA_WANT_xxx), driver availability (driver JSON parametrization), and platform options (handled separately).

The relevant boolean options in Mbed TLS 3.6 are:

MBEDTLS_AES_FEWER_TABLES
MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH
MBEDTLS_AES_ROM_TABLES
MBEDTLS_CAMELLIA_SMALL_MEMORY
MBEDTLS_ECP_FIXED_POINT_OPTIM
MBEDTLS_ECP_NIST_OPTIM

If any of those options are to be removed or reorganized, this should be tracked as a separate issue.

[gilles-peskine-arm]

I just found that this already exists in the mbedtls repository. Mbed-TLS/mbedtls#9100

[gilles-peskine-arm]

The mbedtls issue is a broader study issue, so on second thoughts I'm reopening this one to focus on the options that are being moved and renamed.