s390/zcrypt: Introduce new SHA-512 based Pseudo Random Generator.
Rework of the prandom device with introduction of a new SHA-512 based NIST SP 800-90 conform deterministic random bit generator. Signed-off-by:Harald Freudenberger <freude@linux.vnet.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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