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Fix incorrect comments on slice numbering

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The persistent key cache slice is the last slice (not the first as
previously stated). Update the numbering-related comments accordingly.

Signed-off-by: David Horstmann <david.horstmann@arm.com>
This commit is contained in:
David Horstmann 2024-08-21 14:41:06 +01:00 committed by Gilles Peskine
parent d339aefd91
commit fdcc47c426
1 changed files with 3 additions and 2 deletions
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5
tf-psa-crypto/core/psa_crypto_slot_management.c
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@ -77,10 +77,11 @@ MBEDTLS_STATIC_ASSERT(PSA_KEY_ID_VOLATILE_MAX < MBEDTLS_PSA_KEY_ID_BUILTIN_MIN |
* located after the slices for volatile keys.
*/
/* Size of slice 0 containing the cache of persistent and built-in keys. */
/* Size of the last slice containing the cache of persistent and built-in keys. */
#define PERSISTENT_KEY_CACHE_COUNT MBEDTLS_PSA_KEY_SLOT_COUNT
/* Volatile keys are stored in slices 1 through KEY_SLICE_COUNT inclusive.
/* Volatile keys are stored in slices 0 through
* (KEY_SLOT_VOLATILE_SLICE_COUNT - 1) inclusive.
* Each slice is twice the size of the previous slice.
* Volatile key identifiers encode the slice number as follows:
* bits 30..31: 0b10 (mandated by the PSA Crypto specification).