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The key supplied in the plain bytes file with 'pvsecret create retrievable' with type 'hmac-sha' is they key 'K_0' as of FIPS-198-1, i.e. the key 'K' after any necessary pre-processing. The pre-processing must be performed by the user prior to creating the retrievable secret. Describe in detail how that pre-processing must be performed. Signed-off-by: Ingo Franzki <ifranzki@linux.ibm.com> Signed-off-by: Steffen Eiden <seiden@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>