Abridged for tweet linux-3.19/drivers/char/random.c: if (fips_enabled && !memcmp(tmp, last, 10)) panic("Hardware RNG duplicated output!\n");
@solardiz Uhg. I think you should expect that to happen after roughly 256^5 tries. That's a big number but not big enough not to happen.
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@RichFelker No, this isn't a case of birthday paradox. With a good RNG, it'll be ~256^10 until this happens. -
@solardiz Yes, my bad. It's not triggered by a duplicate but consecutive duplicates. Missed that detail.
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@solardiz AFAIK FIPS allows you to violate its own requirements as long as you document reasons. This is a case that calls for that.Thanks. Twitter will use this to make your timeline better. UndoUndo
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