This adds a Trusted Credential storage backend using the PSA
Protected Storage API, permitting storage of the credentials
offering a trusted long-term storage with integrity checks.
This implementation tries to fit the actual tls_credentials
implementation, with some slight differences:
- the buffer pointer returned by credetial_get & credential_next_get
is dynamically allocated and differs from the one given to
tls_credential_add since it's extracted from the storage at runtime.
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
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