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SE driver: report the bit size on key import

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Add a parameter to the key import method of a secure element driver to
make it report the key size in bits. This is necessary (otherwise the
core has no idea what the bit-size is), and making import report it is
easier than adding a separate method (for other key creation methods,
this information is an input, not an output).
This commit is contained in:
Gilles Peskine
2019-07-24 20:25:59 +02:00
parent dc5bfe9784
commit 1801740a7c
3 changed files with 21 additions and 11 deletions
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11
include/psa/crypto_se_driver.h
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@ -833,14 +833,18 @@ typedef psa_status_t (*psa_drv_se_allocate_key_t)(
*
* \param[in,out] drv_context The driver context structure.
* \param[in] key_slot Slot where the key will be stored
* This must be a valid slot for a key of the chosen
* type. It must be unoccupied.
* This must be a valid slot for a key of the
* chosen type. It must be unoccupied.
* \param[in] lifetime The required lifetime of the key storage
* \param[in] type Key type (a \c PSA_KEY_TYPE_XXX value)
* \param[in] algorithm Key algorithm (a \c PSA_ALG_XXX value)
* \param[in] usage The allowed uses of the key
* \param[in] p_data Buffer containing the key data
* \param[in] data_length Size of the `data` buffer in bytes
* \param[out] bits On success, the key size in bits. The driver
* must determine this value after parsing the
* key according to the key type.
* This value is not used if the function fails.
*
* \retval #PSA_SUCCESS
* Success.
@ -852,7 +856,8 @@ typedef psa_status_t (*psa_drv_se_import_key_t)(psa_drv_se_context_t *drv_contex
psa_algorithm_t algorithm,
psa_key_usage_t usage,
const uint8_t *p_data,
size_t data_length);
size_t data_length,
size_t *bits);
/**
* \brief A function that destroys a secure element key and restore the slot to