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122 lines
3.6 KiB
C
122 lines
3.6 KiB
C
/** @file
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Null version of the Arm TRNG (True Random Number Generator) services
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(Cf [1]).
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Copyright (c) 2021 - 2022, Arm Limited. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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@par Reference(s):
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- [1] Arm True Random Number Generator Firmware, Interface 1.0,
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Platform Design Document.
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(https://developer.arm.com/documentation/den0098/latest/)
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- [2] NIST Special Publication 800-90B, Recommendation for the Entropy
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Sources Used for Random Bit Generation.
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(https://csrc.nist.gov/publications/detail/sp/800-90b/final)
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@par Glossary:
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- TRNG - True Random Number Generator
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**/
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#include <Library/DebugLib.h>
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#include <Library/ArmTrngLib.h>
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/** Get the version of the Arm TRNG backend.
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A TRNG may be implemented by the system firmware, in which case this
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function shall return the version of the Arm TRNG backend.
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The implementation must return NOT_SUPPORTED if a Back end is not present.
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@param [out] MajorRevision Major revision.
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@param [out] MinorRevision Minor revision.
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@retval RETURN_SUCCESS The function completed successfully.
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@retval RETURN_INVALID_PARAMETER Invalid parameter.
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@retval RETURN_UNSUPPORTED Backend not present.
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**/
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RETURN_STATUS
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EFIAPI
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GetArmTrngVersion (
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OUT UINT16 *MajorRevision,
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OUT UINT16 *MinorRevision
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)
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{
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ASSERT (FALSE);
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return RETURN_UNSUPPORTED;
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}
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/** Get the UUID of the Arm TRNG backend.
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A TRNG may be implemented by the system firmware, in which case this
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function shall return the UUID of the TRNG backend.
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Returning the Arm TRNG UUID is optional and if not implemented,
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RETURN_UNSUPPORTED shall be returned.
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Note: The caller must not rely on the returned UUID as a trustworthy Arm TRNG
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Back end identity
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@param [out] Guid UUID of the Arm TRNG backend.
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@retval RETURN_SUCCESS The function completed successfully.
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@retval RETURN_INVALID_PARAMETER Invalid parameter.
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@retval RETURN_UNSUPPORTED Function not implemented.
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**/
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RETURN_STATUS
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EFIAPI
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GetArmTrngUuid (
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OUT GUID *Guid
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)
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{
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ASSERT (FALSE);
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return RETURN_UNSUPPORTED;
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}
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/** Returns maximum number of entropy bits that can be returned in a single
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call.
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@return Returns the maximum number of Entropy bits that can be returned
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in a single call to GetArmTrngEntropy().
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**/
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UINTN
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EFIAPI
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GetArmTrngMaxSupportedEntropyBits (
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VOID
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)
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{
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ASSERT (FALSE);
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return 0;
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}
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/** Returns N bits of conditioned entropy.
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See [2] Section 2.3.1 GetEntropy: An Interface to the Entropy Source
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GetEntropy
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Input:
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bits_of_entropy: the requested amount of entropy
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Output:
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entropy_bitstring: The string that provides the requested entropy.
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status: A Boolean value that is TRUE if the request has been satisfied,
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and is FALSE otherwise.
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@param [in] EntropyBits Number of entropy bits requested.
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@param [in] BufferSize Size of the Buffer in bytes.
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@param [out] Buffer Buffer to return the entropy bits.
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@retval RETURN_SUCCESS The function completed successfully.
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@retval RETURN_INVALID_PARAMETER Invalid parameter.
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@retval RETURN_UNSUPPORTED Function not implemented.
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@retval RETURN_BAD_BUFFER_SIZE Buffer size is too small.
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@retval RETURN_NOT_READY No Entropy available.
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**/
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RETURN_STATUS
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EFIAPI
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GetArmTrngEntropy (
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IN UINTN EntropyBits,
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IN UINTN BufferSize,
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OUT UINT8 *Buffer
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)
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{
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ASSERT (FALSE);
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return RETURN_UNSUPPORTED;
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}
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