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Specialize some wording from the specification

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Some of the material was originally the PSA specification, and
discusses how different implementations might behave. Replace such
statements by a description of how Mbed TLS behaves.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2020-12-11 18:47:55 +01:00
parent 9b3e5a7b3e
commit e39bdaa0ed
1 changed files with 13 additions and 18 deletions
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31
include/psa/crypto_types.h
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@ -131,11 +131,10 @@ typedef uint32_t psa_algorithm_t;
* The application can call psa_open_key() to open a persistent key that
* it created previously.
*
* This specification defines two basic lifetime values:
* - Keys with the lifetime #PSA_KEY_LIFETIME_VOLATILE are volatile.
* This lifetime is always supported.
* - Keys with the lifetime #PSA_KEY_LIFETIME_PERSISTENT are persistent.
* This lifetime is always supported if persistent storage is available.
* The default lifetime of a key is #PSA_KEY_LIFETIME_VOLATILE. The lifetime
* #PSA_KEY_LIFETIME_PERSISTENT is supported if persistent storage is
* available. Other lifetime values may be supported depending on the
* library configuration.
*/
typedef uint32_t psa_key_lifetime_t;
@ -180,9 +179,10 @@ typedef uint8_t psa_key_persistence_t;
* in wrapped (encrypted) form alongside the key metadata in the
* primary local storage.
*
* This specification defines the following values of location indicators:
* The PSA Cryptography API specification defines the following values of
* location indicators:
* - \c 0: primary local storage.
* All implementations should support this value.
* This location is always available.
* The primary local storage is typically the same storage area that
* contains the key metadata.
* - \c 1: primary secure element.
@ -209,7 +209,7 @@ typedef uint32_t psa_key_location_t;
*
* - Applications may freely choose key identifiers in the range
* #PSA_KEY_ID_USER_MIN to #PSA_KEY_ID_USER_MAX.
* - Implementations may define additional key identifiers in the range
* - The implementation may define additional key identifiers in the range
* #PSA_KEY_ID_VENDOR_MIN to #PSA_KEY_ID_VENDOR_MAX.
* - 0 is reserved as an invalid key identifier.
* - Key identifiers outside these ranges are reserved for future use.
@ -248,23 +248,18 @@ typedef uint32_t psa_key_usage_t;
* - The key's policy, comprising usage flags and a specification of
* the permitted algorithm(s).
* - Information about the key itself: the key type and its size.
* - Implementations may define additional attributes.
* - Additional implementation-defined attributes.
*
* The actual key material is not considered an attribute of a key.
* Key attributes do not contain information that is generally considered
* highly confidential.
*
* An attribute structure can be a simple data structure where each function
* An attribute structure works like a simple data structure where each function
* `psa_set_key_xxx` sets a field and the corresponding function
* `psa_get_key_xxx` retrieves the value of the corresponding field.
* However, implementations may report values that are equivalent to the
* original one, but have a different encoding. For example, an
* implementation may use a more compact representation for types where
* many bit-patterns are invalid or not supported, and store all values
* that it does not support as a special marker value. In such an
* implementation, after setting an invalid value, the corresponding
* get function returns an invalid value which may not be the one that
* was originally stored.
* However, a future version of the library may report values that are
* equivalent to the original one, but have a different encoding. Invalid
* values may be mapped to different, also invalid values.
*
* An attribute structure may contain references to auxiliary resources,
* for example pointers to allocated memory or indirect references to