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tee: add support for session's client UUID generation
TEE Client API defines that from user space only information needed for specified login operations is group identifier for group based logins. REE kernel is expected to formulate trustworthy client UUID and pass that to TEE environment. REE kernel is required to verify that provided group identifier for group based logins matches calling processes group memberships. TEE specification only defines that the information passed from REE environment to TEE environment is encoded into on UUID. In order to guarantee trustworthiness of client UUID user space is not allowed to freely pass client UUID. UUIDv5 form is used encode variable amount of information needed for different login types. Signed-off-by: Vesa Jääskeläinen <vesa.jaaskelainen@vaisala.com> (cherry picked from commit baa151f)
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