Removed from gEfiRngAlgorithmRaw an incorrect assumption that
Raw cannot return less than 256 bits. The DRNG Algorithms
should always use a 256 bit seed as per nist standards
however a caller is free to request less than 256 bits.
>
> //
> // When a DRBG is used on the output of a entropy source,
> // its security level must be at least 256 bits according to UEFI
Spec.
> //
> if (RNGValueLength < 32) {
> return EFI_INVALID_PARAMETER;
> }
>
AARCH64 platforms do not have this limitation and this brings both
implementations into alignment with each other and the spec.
Cc: Jiewen Yao <jiewen....@intel.com>
Signed-off-by: Doug Flick [MSFT] <doug.e...@gmail.com>
Reviewed-by: Ard Biesheuvel <a...@kernel.org>
---
SecurityPkg/RandomNumberGenerator/RngDxe/Rand/RngDxe.c | 8 --------
1 file changed, 8 deletions(-)
diff --git a/SecurityPkg/RandomNumberGenerator/RngDxe/Rand/RngDxe.c
b/SecurityPkg/RandomNumberGenerator/RngDxe/Rand/RngDxe.c
index 7e06e16e4b..5723ed6957 100644
--- a/SecurityPkg/RandomNumberGenerator/RngDxe/Rand/RngDxe.c
+++ b/SecurityPkg/RandomNumberGenerator/RngDxe/Rand/RngDxe.c
@@ -116,14 +116,6 @@ RngGetRNG (
// The "raw" algorithm is intended to provide entropy directly
//
if (CompareGuid (RNGAlgorithm, &gEfiRngAlgorithmRaw)) {
- //
- // When a DRBG is used on the output of a entropy source,
- // its security level must be at least 256 bits according to UEFI Spec.
- //
- if (RNGValueLength < 32) {
- return EFI_INVALID_PARAMETER;
- }
-
Status = GenerateEntropy (RNGValueLength, RNGValue);
return Status;
}
--
2.34.1
