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The non-cryptographic RNG implemented by random() has the property that a seed value of zero will result in a generated sequence of all-zero values. This situation can arise if currticks() returns zero at start of day. Work around this problem by falling back to a fixed non-zero seed if necessary. This has no effect on the separate DRBG used by cryptographic code. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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