Fork of ipxe; additional commands and features https://git.openslx.org/openslx-ng/ipxe.git/atom/src/arch/x86/interface/efi/efi_entropy.c?h=openslx 2016-05-04T13:34:24+00:00 2016-05-04T13:34:24+00:00 Michael Brown 2016-05-04T13:13:44+00:00 urn:sha1:57d0ea7c461d4ba2c8befa9506472c81129c30b3 Signed-off-by: Michael Brown <mcb30@ipxe.org> 2015-04-14T16:53:13+00:00 Michael Brown 2015-04-14T16:53:13+00:00 urn:sha1:7ca801d637de3e2941f02f376ee1f0e26eabdfcb Entropy gathering via timer ticks is slow under UEFI (of the order of 20-30 seconds on some machines). Use the EFI_RNG_PROTOCOL if available, to speed up the process of entropy gathering. Note that some implementations (including EDK2) will fail if we request fewer than 32 random bytes at a time, and that the RNG protocol provides no guarantees about the amount of entropy provided by a call to GetRNG(). We take the (hopefully pessimistic) view that a 32-byte block returned by GetRNG() will contain at least the 1.3 bits of entropy claimed by min_entropy_per_sample(). Signed-off-by: Michael Brown <mcb30@ipxe.org> 2015-04-14T10:37:38+00:00 Michael Brown 2015-04-14T09:56:20+00:00 urn:sha1:eb2252fd7a580a625d426562b9498f28226a75e7 Originally-implemented-by: Jarrod Johnson <jbjohnso@us.ibm.com> Signed-off-by: Michael Brown <mcb30@ipxe.org>