[PATCH v3 0/6] SecurityPkg/MdePkg: Update RngLib GUID identification

["PierreGondois" <pierre.gondois@arm.com>]

From: Pierre Gondois <pierre.gondois@arm.com>

v3:
- As the unsafe algorithm GUID will not be added to the UEFI
  specification, rename:
  - gEfiRngAlgorithmUnSafe to gEdkiiRngAlgorithmUnSafe
  - EFI_RNG_ALGORITHM_UNSAFE to EDKII_RNG_ALGORITHM_UNSAFE

v2:
[1/8] MdePkg/ArmTrngLib: Remove ASSERTs in Null implementation
- Dropped
[2/8] MdePkg/MdePkg.dec: Move PcdCpuRngSupportedAlgorithm to MdePkg
- Change gEfiMdePkgTokenSpaceGuid.PcdCpuRngSupportedAlgorithm
  token number
- Rename to SecurityPkg/SecurityPkg.dec: Move
  PcdCpuRngSupportedAlgorithm to MdePkg
[5/8] MdePkg/Rng: Add GetRngGuid() to RngLib
- Remove gEfiRngAlgorithmUnSafe from inf file
- Split Guids definitions in arch specific sections
[6/8] SecurityPkg/RngDxe: Use GetRngGuid() when probing RngLib
- Remove RngFindDefaultAlgo() and change logic accordingly.
[7/8] SecurityPkg/RngDxe: Select safe default Rng algorithm
- Dropped due to changes in [6/8]

This patch also requires the following patch on top of the serie:
- https://edk2.groups.io/g/devel/message/106546

This patchset follows the 'code first' approach and relates to [1].
This patchset follows the thread at [3] that aims to solve [2].
[1] and [2] are bound and this patchset aims to solve both.

In this patchset:
a-
The RngDxe can rely on the RngLib. However the RngLib has no
interface allowing to describe which Rng algorithm is implemented.
The RngDxe must advertise the algorithm that are available through
the RngGetInfo() callback.
Add a GetRngGuid() for interface to the RngLib.

b-
The Arm Architecture states the RNDR that the DRBG algorithm should
be compliant with NIST SP800-90A, while not mandating a particular
algorithm, so as to be inclusive of different geographies.
The RngLib can rely on this Arm RNDR instruction. In order to
accurately describe the implementation using the RNDR instruction,
add a EFI_RNG_ALGORITHM_ARM_RNDR GUID [1].

c-
For the same reason as a/b, add a GUID describing unsafe RNG
algorithms, allowing to accurately describe the BaseRngLibTimerLib.

d-
Use a/b/c mechanisms/GUIDs to select a safe Rng algorithm in the
Arm implementation of the RngDxe.

[1] BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4441
[2] BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4151
[3] https://edk2.groups.io/g/devel/message/100806

Pierre Gondois (6):
  SecurityPkg/SecurityPkg.dec: Move PcdCpuRngSupportedAlgorithm to
    MdePkg
  MdePkg/DxeRngLib: Request raw algorithm instead of default
  MdePkg/Rng: Add GUIDs to describe Rng algorithms
  MdePkg/Rng: Add GetRngGuid() to RngLib
  SecurityPkg/RngDxe: Use GetRngGuid() when probing RngLib
  SecurityPkg/RngDxe: Simplify Rng algorithm selection for Arm

 MdePkg/Include/Library/RngLib.h               | 17 ++++++
 MdePkg/Include/Protocol/Rng.h                 | 20 +++++++
 MdePkg/Library/BaseRngLib/AArch64/Rndr.c      | 42 +++++++++++++++
 MdePkg/Library/BaseRngLib/BaseRngLib.inf      | 10 ++++
 MdePkg/Library/BaseRngLib/Rand/RdRand.c       | 26 +++++++++
 .../Library/BaseRngLibNull/BaseRngLibNull.c   | 22 ++++++++
 .../BaseRngLibTimerLib/BaseRngLibTimerLib.inf |  3 ++
 .../Library/BaseRngLibTimerLib/RngLibTimer.c  | 28 ++++++++++
 MdePkg/Library/DxeRngLib/DxeRngLib.c          | 36 ++++++++++++-
 MdePkg/MdePkg.dec                             |  7 +++
 .../RngDxe/AArch64/AArch64Algo.c              | 54 +++++++++++++------
 .../RandomNumberGenerator/RngDxe/ArmRngDxe.c  | 23 ++++----
 .../RandomNumberGenerator/RngDxe/RngDxe.inf   |  5 +-
 SecurityPkg/SecurityPkg.dec                   |  2 -
 14 files changed, 258 insertions(+), 37 deletions(-)

-- 
2.25.1