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H A Dtee_fs_key_manager.cdf91a52223295c917ef5a8eb6bfaf0ad0544b6b8 Thu Apr 25 14:06:02 UTC 2019 Jens Wiklander <jens.wiklander@linaro.org> core: derive SSK using huk_subkey_derive()

tee_fs_init_key_manager() uses huk_subkey_derive() to derive the SSK
instead of MAC:ing etc directly.

Note that this is only backwards compatible if
CFG_CORE_HUK_SUBKEY_COMPAT=y.

Reviewed-by: Joakim Bech <joakim.bech@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>