The crng code requires at least 64 bytes (2 * CHACHA20_BLOCK_SIZE)
to complete the fast boot-time init, so provide that many bytes
when invoking UEFI protocols to seed the entropy pool. Also, add
a notice so we can tell from the boot log when the seeding actually
took place.
Signed-off-by: Ard Bie
In preparation of adding support for the Chaoskey USB stick to the
UEFI stub, import the USB I/O protocol declarations and related types
to linux/efi.h.
Signed-off-by: Ard Biesheuvel
---
include/linux/efi.h | 66 +
1 file changed, 66 insertions
Early entropy is hard to come by, especially on non-x86 systems that
lack an architected instruction and are not as uniform as PCs.
Fortunately, on UEFI systems, we can invoke the EFI_RNG_PROTOCOL,
which exposes the platform specific entropy source in a generic way.
We use this protocol to fill the
