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psa: Implement persistent keys

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Allow use of persistent keys, including configuring them, importing and
exporting them, and destroying them.

When getting a slot using psa_get_key_slot, there are 3 scenarios that
can occur if the keys lifetime is persistent:

1. Key type is PSA_KEY_TYPE_NONE, no persistent storage entry:
   -  The key slot is treated as a standard empty key slot
2. Key type is PSA_KEY_TYPE_NONE, persistent storage entry exists:
   -  Attempt to load the key from persistent storage
3. Key type is not PSA_KEY_TYPE_NONE:
   -  As checking persistent storage on every use of the key could
      be expensive, the persistent key is assumed to be saved in
      persistent storage, the in-memory key is continued to be used.
This commit is contained in:
Darryl Green 2018-06-18 17:27:26 +01:00
parent 40225ba709
commit d49a499d03
9 changed files with 599 additions and 5 deletions
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2
scripts/mbed_crypto.make
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@ -158,6 +158,8 @@ TEST_FILES := \
tests/suites/test_suite_psa_crypto_hash.function \
tests/suites/test_suite_psa_crypto_metadata.data \
tests/suites/test_suite_psa_crypto_metadata.function \
tests/suites/test_suite_psa_crypto_persistent_key.data \
tests/suites/test_suite_psa_crypto_persistent_key.function \
tests/suites/test_suite_psa_crypto_storage_file.data \
tests/suites/test_suite_psa_crypto_storage_file.function \
# Don't delete this line.