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Clarify the explanation of locations

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It's about who has access to the key material in plaintext, not directly
where the operation is performed.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2020-12-11 18:46:01 +01:00
parent d0107b96af
commit 9b3e5a7b3e
1 changed files with 5 additions and 5 deletions
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10
include/psa/crypto_types.h
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@ -115,9 +115,8 @@ typedef uint32_t psa_algorithm_t;
* whether the key is _volatile_ or _persistent_.
* See ::psa_key_persistence_t for more information.
* - Bits 8-31 (#PSA_KEY_LIFETIME_GET_LOCATION(\c lifetime)):
* location indicator. This value indicates where the key material is stored
* (or at least where it is accessible in cleartext) and where operations
* on the key are performed.
* location indicator. This value indicates which part of the system
* has access to the key material and can perform operations using the key.
* See ::psa_key_location_t for more information.
*
* Volatile keys are automatically destroyed when the application instance
@ -176,9 +175,10 @@ typedef uint8_t psa_key_persistence_t;
* If an integration of Mbed TLS can make calls to external
* cryptoprocessors such as secure elements, the location of a key
* indicates which secure element performs the operations on the key.
* Depending on the design of the driver for the secure element, the key
* Depending on the design of the secure element, the key
* material may either be stored either in the secure element, or
* in wrapped form alongside the key metadata in the primary local storage.
* in wrapped (encrypted) form alongside the key metadata in the
* primary local storage.
*
* This specification defines the following values of location indicators:
* - \c 0: primary local storage.