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| author | Sami Mujawar <sami.mujawar@arm.com> | 2022-10-28 17:32:47 +0200 |
|---|---|---|
| committer | mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> | 2022-11-06 16:32:28 +0000 |
| commit | ef4cf3d88df2dd2b8afa790007c9f62a3d6cfcd6 (patch) | |
| tree | 51b138e90d83a3565c3b252a8ae0d15e8112e929 /MdePkg/Library/BaseArmTrngLibNull/BaseArmTrngLibNull.c | |
| parent | cbce5a1a93ab092d9c2c4c7949f26f6a9d753995 (diff) | |
| download | edk2-ef4cf3d88df2dd2b8afa790007c9f62a3d6cfcd6.tar.gz edk2-ef4cf3d88df2dd2b8afa790007c9f62a3d6cfcd6.tar.bz2 edk2-ef4cf3d88df2dd2b8afa790007c9f62a3d6cfcd6.zip | |
MdePkg/ArmTrngLib: Add NULL instance of Arm TRNG Library
Bugzilla: 3668 (https://bugzilla.tianocore.org/show_bug.cgi?id=3668)
The Arm True Random Number Generator (TRNG) library defines an
interface to access the entropy source on a platform. On platforms
that do not have access to an entropy source, a NULL instance of
the TRNG library may be useful to satisfy the build dependency.
Therefore, add a NULL instance of the Arm TRNG library.
Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
Diffstat (limited to 'MdePkg/Library/BaseArmTrngLibNull/BaseArmTrngLibNull.c')
| -rw-r--r-- | MdePkg/Library/BaseArmTrngLibNull/BaseArmTrngLibNull.c | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseArmTrngLibNull/BaseArmTrngLibNull.c b/MdePkg/Library/BaseArmTrngLibNull/BaseArmTrngLibNull.c new file mode 100644 index 0000000000..316d78bf5e --- /dev/null +++ b/MdePkg/Library/BaseArmTrngLibNull/BaseArmTrngLibNull.c @@ -0,0 +1,121 @@ +/** @file
+ Null version of the Arm TRNG (True Random Number Generator) services
+ (Cf [1]).
+
+ Copyright (c) 2021 - 2022, Arm Limited. All rights reserved.<BR>
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+ @par Reference(s):
+ - [1] Arm True Random Number Generator Firmware, Interface 1.0,
+ Platform Design Document.
+ (https://developer.arm.com/documentation/den0098/latest/)
+ - [2] NIST Special Publication 800-90B, Recommendation for the Entropy
+ Sources Used for Random Bit Generation.
+ (https://csrc.nist.gov/publications/detail/sp/800-90b/final)
+
+ @par Glossary:
+ - TRNG - True Random Number Generator
+**/
+
+#include <Library/DebugLib.h>
+#include <Library/ArmTrngLib.h>
+
+/** Get the version of the Arm TRNG backend.
+
+ A TRNG may be implemented by the system firmware, in which case this
+ function shall return the version of the Arm TRNG backend.
+ The implementation must return NOT_SUPPORTED if a Back end is not present.
+
+ @param [out] MajorRevision Major revision.
+ @param [out] MinorRevision Minor revision.
+
+ @retval RETURN_SUCCESS The function completed successfully.
+ @retval RETURN_INVALID_PARAMETER Invalid parameter.
+ @retval RETURN_UNSUPPORTED Backend not present.
+**/
+RETURN_STATUS
+EFIAPI
+GetArmTrngVersion (
+ OUT UINT16 *MajorRevision,
+ OUT UINT16 *MinorRevision
+ )
+{
+ ASSERT (FALSE);
+ return RETURN_UNSUPPORTED;
+}
+
+/** Get the UUID of the Arm TRNG backend.
+
+ A TRNG may be implemented by the system firmware, in which case this
+ function shall return the UUID of the TRNG backend.
+ Returning the Arm TRNG UUID is optional and if not implemented,
+ RETURN_UNSUPPORTED shall be returned.
+
+ Note: The caller must not rely on the returned UUID as a trustworthy Arm TRNG
+ Back end identity
+
+ @param [out] Guid UUID of the Arm TRNG backend.
+
+ @retval RETURN_SUCCESS The function completed successfully.
+ @retval RETURN_INVALID_PARAMETER Invalid parameter.
+ @retval RETURN_UNSUPPORTED Function not implemented.
+**/
+RETURN_STATUS
+EFIAPI
+GetArmTrngUuid (
+ OUT GUID *Guid
+ )
+{
+ ASSERT (FALSE);
+ return RETURN_UNSUPPORTED;
+}
+
+/** Returns maximum number of entropy bits that can be returned in a single
+ call.
+
+ @return Returns the maximum number of Entropy bits that can be returned
+ in a single call to GetArmTrngEntropy().
+**/
+UINTN
+EFIAPI
+GetArmTrngMaxSupportedEntropyBits (
+ VOID
+ )
+{
+ ASSERT (FALSE);
+ return 0;
+}
+
+/** Returns N bits of conditioned entropy.
+
+ See [2] Section 2.3.1 GetEntropy: An Interface to the Entropy Source
+ GetEntropy
+ Input:
+ bits_of_entropy: the requested amount of entropy
+ Output:
+ entropy_bitstring: The string that provides the requested entropy.
+ status: A Boolean value that is TRUE if the request has been satisfied,
+ and is FALSE otherwise.
+
+ @param [in] EntropyBits Number of entropy bits requested.
+ @param [in] BufferSize Size of the Buffer in bytes.
+ @param [out] Buffer Buffer to return the entropy bits.
+
+ @retval RETURN_SUCCESS The function completed successfully.
+ @retval RETURN_INVALID_PARAMETER Invalid parameter.
+ @retval RETURN_UNSUPPORTED Function not implemented.
+ @retval RETURN_BAD_BUFFER_SIZE Buffer size is too small.
+ @retval RETURN_NOT_READY No Entropy available.
+**/
+RETURN_STATUS
+EFIAPI
+GetArmTrngEntropy (
+ IN UINTN EntropyBits,
+ IN UINTN BufferSize,
+ OUT UINT8 *Buffer
+ )
+{
+ ASSERT (FALSE);
+ return RETURN_UNSUPPORTED;
+}
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