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/** @file
RNG Driver to produce the UEFI Random Number Generator protocol.
The driver uses CPU RNG instructions to produce high-quality,
high-performance entropy and random number.
RNG Algorithms defined in UEFI 2.4:
- EFI_RNG_ALGORITHM_SP800_90_CTR_256_GUID
- EFI_RNG_ALGORITHM_RAW
- EFI_RNG_ALGORITHM_SP800_90_HMAC_256_GUID
- EFI_RNG_ALGORITHM_SP800_90_HASH_256_GUID
- EFI_RNG_ALGORITHM_X9_31_3DES_GUID
- EFI_RNG_ALGORITHM_X9_31_AES_GUID
Copyright (c) 2013 - 2018, Intel Corporation. All rights reserved.<BR>
(C) Copyright 2015 Hewlett Packard Enterprise Development LP<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/RngLib.h>
#include <Library/TimerLib.h>
#include <Protocol/Rng.h>
#include "RngDxeInternals.h"
/**
Returns information about the random number generation implementation.
@param[in] This A pointer to the EFI_RNG_PROTOCOL instance.
@param[in,out] RNGAlgorithmListSize On input, the size in bytes of RNGAlgorithmList.
On output with a return code of EFI_SUCCESS, the size
in bytes of the data returned in RNGAlgorithmList. On output
with a return code of EFI_BUFFER_TOO_SMALL,
the size of RNGAlgorithmList required to obtain the list.
@param[out] RNGAlgorithmList A caller-allocated memory buffer filled by the driver
with one EFI_RNG_ALGORITHM element for each supported
RNG algorithm. The list must not change across multiple
calls to the same driver. The first algorithm in the list
is the default algorithm for the driver.
@retval EFI_SUCCESS The RNG algorithm list was returned successfully.
@retval EFI_UNSUPPORTED The services is not supported by this driver.
@retval EFI_DEVICE_ERROR The list of algorithms could not be retrieved due to a
hardware or firmware error.
@retval EFI_INVALID_PARAMETER One or more of the parameters are incorrect.
@retval EFI_BUFFER_TOO_SMALL The buffer RNGAlgorithmList is too small to hold the result.
**/
EFI_STATUS
EFIAPI
RngGetInfo (
IN EFI_RNG_PROTOCOL *This,
IN OUT UINTN *RNGAlgorithmListSize,
OUT EFI_RNG_ALGORITHM *RNGAlgorithmList
)
{
EFI_STATUS Status;
if ((This == NULL) || (RNGAlgorithmListSize == NULL)) {
return EFI_INVALID_PARAMETER;
}
//
// Return algorithm list supported by driver.
//
if (RNGAlgorithmList != NULL) {
Status = ArchGetSupportedRngAlgorithms (RNGAlgorithmListSize, RNGAlgorithmList);
} else {
Status = EFI_INVALID_PARAMETER;
}
return Status;
}
//
// The Random Number Generator (RNG) protocol
//
EFI_RNG_PROTOCOL mRngRdRand = {
RngGetInfo,
RngGetRNG
};
/**
The user Entry Point for the Random Number Generator (RNG) driver.
@param[in] ImageHandle The firmware allocated handle for the EFI image.
@param[in] SystemTable A pointer to the EFI System Table.
@retval EFI_SUCCESS The entry point is executed successfully.
@retval EFI_NOT_SUPPORTED Platform does not support RNG.
@retval Other Some error occurs when executing this entry point.
**/
EFI_STATUS
EFIAPI
RngDriverEntry (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
EFI_HANDLE Handle;
//
// Install UEFI RNG (Random Number Generator) Protocol
//
Handle = NULL;
Status = gBS->InstallMultipleProtocolInterfaces (
&Handle,
&gEfiRngProtocolGuid,
&mRngRdRand,
NULL
);
return Status;
}
/**
Calls RDRAND to fill a buffer of arbitrary size with random bytes.
@param[in] Length Size of the buffer, in bytes, to fill with.
@param[out] RandBuffer Pointer to the buffer to store the random result.
@retval EFI_SUCCESS Random bytes generation succeeded.
@retval EFI_NOT_READY Failed to request random bytes.
**/
EFI_STATUS
EFIAPI
RngGetBytes (
IN UINTN Length,
OUT UINT8 *RandBuffer
)
{
BOOLEAN IsRandom;
UINT64 TempRand[2];
while (Length > 0) {
IsRandom = GetRandomNumber128 (TempRand);
if (!IsRandom) {
return EFI_NOT_READY;
}
if (Length >= sizeof (TempRand)) {
WriteUnaligned64 ((UINT64 *)RandBuffer, TempRand[0]);
RandBuffer += sizeof (UINT64);
WriteUnaligned64 ((UINT64 *)RandBuffer, TempRand[1]);
RandBuffer += sizeof (UINT64);
Length -= sizeof (TempRand);
} else {
CopyMem (RandBuffer, TempRand, Length);
Length = 0;
}
}
return EFI_SUCCESS;
}
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