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psa: crypto_extra: update documentation of MBEDTLS_PSA_STATIC_KEY_SLOT_BUFFER_SIZE

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Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
This commit is contained in:
Valerio Setti
2025-10-16 16:36:50 +02:00
parent 45574797e7
commit 5306324015
1 changed files with 4 additions and 11 deletions
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15
include/psa/crypto_extra.h
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@@ -33,9 +33,8 @@ extern "C" {
#endif
/* If the size of static key slots is not explicitly defined by the user, then
* set it to the maximum between PSA_EXPORT_KEY_PAIR_OR_PUBLIC_MAX_SIZE,
* PSA_CIPHER_MAX_KEY_LENGTH and PSA_MAC_MAX_SIZE.
* See mbedtls_config.h for the definition. */
* try to guess it based on some of the most common the key types enabled in the build.
* See mbedtls_config.h for the definition of MBEDTLS_PSA_STATIC_KEY_SLOT_BUFFER_SIZE. */
#if !defined(MBEDTLS_PSA_STATIC_KEY_SLOT_BUFFER_SIZE)
#define MBEDTLS_PSA_STATIC_KEY_SLOT_BUFFER_SIZE 1
@@ -45,6 +44,7 @@ extern "C" {
#define MBEDTLS_PSA_STATIC_KEY_SLOT_BUFFER_SIZE PSA_EXPORT_KEY_PAIR_OR_PUBLIC_MAX_SIZE
#endif
/* This covers ciphers, AEADs and CMAC. */
#if PSA_CIPHER_MAX_KEY_LENGTH > MBEDTLS_PSA_STATIC_KEY_SLOT_BUFFER_SIZE
#undef MBEDTLS_PSA_STATIC_KEY_SLOT_BUFFER_SIZE
#define MBEDTLS_PSA_STATIC_KEY_SLOT_BUFFER_SIZE PSA_CIPHER_MAX_KEY_LENGTH
@@ -52,20 +52,13 @@ extern "C" {
/* For HMAC, it's typical but not mandatory to use a key size that is equal to
* the hash size. */
#if PSA_WANT_ALG_HMAC
#if defined(PSA_WANT_ALG_HMAC)
#if PSA_HASH_MAX_SIZE > MBEDTLS_PSA_STATIC_KEY_SLOT_BUFFER_SIZE
#undef MBEDTLS_PSA_STATIC_KEY_SLOT_BUFFER_SIZE
#define MBEDTLS_PSA_STATIC_KEY_SLOT_BUFFER_SIZE PSA_HASH_MAX_SIZE
#endif
#endif /* PSA_WANT_ALG_HMAC */
#if PSA_WANT_ALG_CMAC
#if PSA_CIPHER_MAX_KEY_LENGTH > MBEDTLS_PSA_STATIC_KEY_SLOT_BUFFER_SIZE
#undef MBEDTLS_PSA_STATIC_KEY_SLOT_BUFFER_SIZE
#define MBEDTLS_PSA_STATIC_KEY_SLOT_BUFFER_SIZE PSA_CIPHER_MAX_KEY_LENGTH
#endif
#endif /* PSA_WANT_ALG_CMAC */
#endif /* !MBEDTLS_PSA_STATIC_KEY_SLOT_BUFFER_SIZE*/
/** \addtogroup attributes