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New usage flag PSA_KEY_USAGE_COPY

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Document the new flag and allow its use.
This commit is contained in:
Gilles Peskine 2019-05-14 14:24:28 +02:00
parent 4318dfc8ec
commit 8e0206aa26
3 changed files with 26 additions and 0 deletions
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14
include/psa/crypto_values.h
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@ -1459,6 +1459,20 @@
*/
#define PSA_KEY_USAGE_EXPORT ((psa_key_usage_t)0x00000001)
/** Whether the key may be copied.
*
* This flag allows the use of psa_crypto_copy() to make a copy of the key
* with the same policy or a more restrictive policy.
*
* For some lifetimes, copying a key also requires the usage flag
* #PSA_KEY_USAGE_EXPORT, because otherwise the source key
* is locked inside a secure processing environment and cannot be
* extracted. For keys with the lifetime #PSA_KEY_LIFETIME_VOLATILE or
* #PSA_KEY_LIFETIME_PERSISTENT, the usage flag #PSA_KEY_USAGE_COPY
* is sufficient to permit the copy.
*/
#define PSA_KEY_USAGE_COPY ((psa_key_usage_t)0x00000002)
/** Whether the key may be used to encrypt a message.
*
* This flag allows the key to be used for a symmetric encryption operation,