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/** @file
Header for the RDRAND APIs used by RNG DXE driver.
Support API definitions for RDRAND instruction access, which will leverage
Intel Secure Key technology to provide high-quality random numbers for use
in applications, or entropy for seeding other random number generators.
Refer to http://software.intel.com/en-us/articles/intel-digital-random-number
-generator-drng-software-implementation-guide/ for more information about Intel
Secure Key technology.
Copyright (c) 2013, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#ifndef __RD_RAND_H__
#define __RD_RAND_H__
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/TimerLib.h>
#include <Protocol/Rng.h>
//
// The maximun number of retries to obtain one available random number.
//
#define RETRY_LIMIT 10
/**
Determines whether or not RDRAND instruction is supported by the host hardware.
@retval EFI_SUCCESS RDRAND instruction supported.
@retval EFI_UNSUPPORTED RDRAND instruction not supported.
**/
EFI_STATUS
EFIAPI
IsRdRandSupported (
VOID
);
/**
Generates a 16-bit random number through RDRAND instruction.
@param[out] Rand Buffer pointer to store the random result.
@retval TRUE RDRAND call was successful.
@retval FALSE Failed attempts to call RDRAND.
**/
BOOLEAN
EFIAPI
RdRand16Step (
OUT UINT16 *Rand
);
/**
Generates a 32-bit random number through RDRAND instruction.
@param[out] Rand Buffer pointer to store the random result.
@retval TRUE RDRAND call was successful.
@retval FALSE Failed attempts to call RDRAND.
**/
BOOLEAN
EFIAPI
RdRand32Step (
OUT UINT32 *Rand
);
/**
Generates a 64-bit random number through RDRAND instruction.
@param[out] Rand Buffer pointer to store the random result.
@retval TRUE RDRAND call was successful.
@retval FALSE Failed attempts to call RDRAND.
**/
BOOLEAN
EFIAPI
RdRand64Step (
OUT UINT64 *Rand
);
/**
Calls RDRAND to obtain a 16-bit random number.
@param[out] Rand Buffer pointer to store the random result.
@param[in] NeedRetry Determine whether or not to loop retry.
@retval EFI_SUCCESS RDRAND call was successful.
@retval EFI_NOT_READY Failed attempts to call RDRAND.
**/
EFI_STATUS
EFIAPI
RdRand16 (
OUT UINT16 *Rand,
IN BOOLEAN NeedRetry
);
/**
Calls RDRAND to obtain a 32-bit random number.
@param[out] Rand Buffer pointer to store the random result.
@param[in] NeedRetry Determine whether or not to loop retry.
@retval EFI_SUCCESS RDRAND call was successful.
@retval EFI_NOT_READY Failed attempts to call RDRAND.
**/
EFI_STATUS
EFIAPI
RdRand32 (
OUT UINT32 *Rand,
IN BOOLEAN NeedRetry
);
/**
Calls RDRAND to obtain a 64-bit random number.
@param[out] Rand Buffer pointer to store the random result.
@param[in] NeedRetry Determine whether or not to loop retry.
@retval EFI_SUCCESS RDRAND call was successful.
@retval EFI_NOT_READY Failed attempts to call RDRAND.
**/
EFI_STATUS
EFIAPI
RdRand64 (
OUT UINT64 *Rand,
IN BOOLEAN NeedRetry
);
/**
Calls RDRAND to request a word-length random number.
@param[out] Rand Buffer pointer to store the random number.
@param[in] NeedRetry Determine whether or not to loop retry.
@retval EFI_SUCCESS Random word generation succeeded.
@retval EFI_NOT_READY Failed to request random word.
**/
EFI_STATUS
EFIAPI
RdRandWord (
OUT UINTN *Rand,
IN BOOLEAN NeedRetry
);
/**
Calls RDRAND to request multiple word-length random numbers.
@param[in] Length Size of the buffer, in words, to fill with.
@param[out] RandBuffer Pointer to the buffer to store the random result.
@retval EFI_SUCCESS Random words generation succeeded.
@retval EFI_NOT_READY Failed to request random words.
**/
EFI_STATUS
EFIAPI
RdRandGetWords (
IN UINTN Length,
OUT UINTN *RandBuffer
);
/**
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
RdRandGetBytes (
IN UINTN Length,
OUT UINT8 *RandBuffer
);
/**
Generate high-quality entropy source through RDRAND.
@param[in] Length Size of the buffer, in bytes, to fill with.
@param[out] Entropy Pointer to the buffer to store the entropy data.
@retval EFI_SUCCESS Entropy generation succeeded.
@retval EFI_NOT_READY Failed to request random data.
**/
EFI_STATUS
EFIAPI
RdRandGenerateEntropy (
IN UINTN Length,
OUT UINT8 *Entropy
);
#endif // __RD_RAND_H__
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