Messages in this thread | | | Date | Sun, 13 Feb 2022 07:54:45 +0100 | From | Dominik Brodowski <> | Subject | Re: [PATCH v2 07/10] random: group entropy collection functions |
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> + * add_device_randomness() adds data to the input pool that > + * is likely to differ between two devices (or possibly even per boot). > + * This would be things like MAC addresses or serial numbers, or the > + * read-out of the RTC. This does *not* credit any actual entropy to > + * the pool, but it initializes the pool to different values for devices > + * that might otherwise be identical and have very little entropy > + * available to them (particularly common in the embedded world). > + * > + * add_input_randomness() uses the input layer interrupt timing, as well > + * as the event type information from the hardware. > + * > + * add_disk_randomness() uses what amounts to the seek time of block > + * layer request events, on a per-disk_devt basis, as input to the > + * entropy pool. Note that high-speed solid state drives with very low > + * seek times do not make for good sources of entropy, as their seek > + * times are usually fairly consistent. > + * > + * The above three routines try to estimate how many bits of entropy
*two* (add_device_randomness() does not credit any entropy).
Thanks, Dominik
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