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Add a note about the code size benefits

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We don't normally make promises related to code size, but this one is vague
enough (just "to benefit"), and it's what a lot of users of this option
care about.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2023-09-20 23:19:46 +02:00
parent 29d0bfba0d
commit 67cf66b427
1 changed files with 10 additions and 0 deletions
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10
include/mbedtls/mbedtls_config.h
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@ -1443,6 +1443,16 @@
* #PSA_WANT_KEY_TYPE_ECC_KEY_PAIR_IMPORT,
* #PSA_WANT_KEY_TYPE_ECC_KEY_PAIR_EXPORT and/or
* #PSA_WANT_KEY_TYPE_ECC_KEY_PAIR_GENERATE as needed.
*
* \note To genuinely benefit from the smaller code size of p256-m, make
* sure that you do not enable any ECC-related option that requires
* the built-in implementation of elliptic curve arithmetic. This
* means enabling #MBEDTLS_PSA_CRYPTO_C, #MBEDTLS_PSA_CRYPTO_CONFIG,
* #PSA_WANT_ECC_SECP_R1_256 and #MBEDTLS_PSA_P256M_DRIVER_ENABLED,
* plus any of the `PSA_WANT_ALG_xxx` and `PSA_WANT_KEY_TYPE_xxx`
* options listed above, and not enabling other ECC-related options
* through `PSA_WANT_xxx` or `MBEDTLS_xxx` (in particular, not
* enabling other curves or EC-JPAKE).
*/
//#define MBEDTLS_PSA_P256M_DRIVER_ENABLED