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Fix the padding of keys that are smaller than the architected slot for
the retrievable key. Previously the keys where appended with zeros.
However, processing software expects a left-padding.
Affected key types:
* Ed448
* SecP521
While at it, fix documentation in the retrievable key struct.
Fixes: fd024387d7 ("rust/pv: Retrievable secrets support")
Acked-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>