Add UEFI RNG Protocol support. The driver will leverage Intel Secure Key technology to produce the Random Number Generator protocol, which is used 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.
Signed-off-by: Long, Qin <qin.long@intel.com> Reviewed-by: Fu, Siyuan <siyuan.fu@intel.com> Reviewed-by: Rosenbaum, Lee G <lee.g.rosenbaum@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14858 6f19259b-4bc3-4df7-8a09-765794883524
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SecurityPkg/RandomNumberGenerator/RngDxe/X64/RdRandWord.c
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SecurityPkg/RandomNumberGenerator/RngDxe/X64/RdRandWord.c
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/** @file
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RDRAND Support Routines.
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Copyright (c) 2013, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "RdRand.h"
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/**
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Calls RDRAND to request a word-length random number.
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@param[out] Rand Buffer pointer to store the random number.
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@param[in] NeedRetry Determine whether or not to loop retry.
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@retval EFI_SUCCESS Random word generation succeeded.
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@retval EFI_NOT_READY Failed to request random word.
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**/
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EFI_STATUS
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EFIAPI
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RdRandWord (
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OUT UINTN *Rand,
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IN BOOLEAN NeedRetry
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)
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{
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return RdRand64 (Rand, NeedRetry);
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}
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/**
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Calls RDRAND to request multiple word-length random numbers.
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@param[in] Length Size of the buffer, in words, to fill with.
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@param[out] RandBuffer Pointer to the buffer to store the random result.
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@retval EFI_SUCCESS Random words generation succeeded.
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@retval EFI_NOT_READY Failed to request random words.
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**/
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EFI_STATUS
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EFIAPI
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RdRandGetWords (
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IN UINTN Length,
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OUT UINTN *RandBuffer
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)
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{
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EFI_STATUS Status;
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UINT32 Index;
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for (Index = 0; Index < Length; Index++) {
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//
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// Obtain one word-length (64-bit) Random Number with possible retry-loop.
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//
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Status = RdRand64 (RandBuffer, TRUE);
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if (EFI_ERROR (Status)) {
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return Status;
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}
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RandBuffer++;
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}
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return EFI_SUCCESS;
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}
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