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Similar as for AES keys, a verification pattern is calculated from an HMAC key by MACing an all zero message of 64 bytes. The first 32 bytes of the result is the verification pattern. Signed-off-by: Ingo Franzki <ifranzki@linux.ibm.com> Reviewed-by: Finn Callies <fcallies@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>