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Clarify some internal documentation

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Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
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Gilles Peskine
2024-08-09 14:04:46 +02:00
parent ac43de0e52
commit 1dfb6b595a
2 changed files with 18 additions and 8 deletions
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10
library/psa_crypto_core.h
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@ -88,7 +88,15 @@ typedef struct {
/* The index of the slice containing this slot.
* This field must be filled if the slot contains a key
* (including keys being created or destroyed), and can be either
* filled or 0 when the slot is free. */
* filled or 0 when the slot is free.
*
* In most cases, the slice index can be deduced from the key identifer.
* We keep it in a separate field for robustness (it reduces the chance
* that a coding mistake in the key store will result in accessing the
* wrong slice), and also so that it's available even on code paths
* during creation or destruction where the key identifier might not be
* filled in.
* */
uint8_t slice_index;
#endif /* MBEDTLS_PSA_KEY_STORE_DYNAMIC */