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Update documentation for psa_close_key

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Adjust the wording to permit multiple handles to a single key - closing
a handle does not necessarily release volatile memory associated with
the key, that only occurs when the last handle is closed.
This commit is contained in:
Andrew Thoelke 2019-08-21 22:46:56 +01:00
parent 9741b11440
commit 3daba812d7
1 changed files with 11 additions and 7 deletions
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18
include/psa/crypto.h
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@ -400,15 +400,19 @@ psa_status_t psa_open_key(psa_key_id_t id,
/** Close a key handle.
*
* If the handle designates a volatile key, destroy the key material and
* free all associated resources, just like psa_destroy_key().
* If the handle designates a volatile key, this will destroy the key material
* and free all associated resources, just like psa_destroy_key().
*
* If the handle designates a persistent key, free all resources associated
* with the key in volatile memory. The key in persistent storage is
* not affected and can be opened again later with psa_open_key().
* If this is the last open handle to a persistent key, then closing the handle
* will free all resources associated with the key in volatile memory. The key
* data in persistent storage is not affected and can be opened again later
* with a call to psa_open_key().
*
* If the key is currently in use in a multipart operation,
* the multipart operation is aborted.
* Closing the key handle makes the handle invalid, and the key handle
* must not be used again by the application..
*
* If the key is currently in use in a multipart operation, then closing the
* last handle to the key will abort the multipart operation.
*
* \param handle The key handle to close.
*