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UPSTREAM: arch/x86: add functions to generate random numbers

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Using x86 RDRAND instruction, two functions are supplied to
generate a 32bit or 64bit number.

One potential usage is the sealing key generation for SGX.

BUG=chrome-os-partner:62438
BRANCH=NONE
TEST=Tested on Eve to generate a 64bit random number.

Change-Id: I5e2768ba499f1e008c9b68feae68b368cedaaa39
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 18792314d7
Original-Change-Id: I50cbeda4de17ccf2fc5efc1fe04f6b1a31ec268c
Original-Signed-off-by: Robbie Zhang <robbie.zhang@intel.com>
Original-Reviewed-on: https://review.coreboot.org/18362
Original-Tested-by: build bot (Jenkins)
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/445138
This commit is contained in:
Robbie Zhang 2017-02-13 13:44:14 -08:00 • committed by chrome-bot
commit b1952cbb9d
3 changed files with 111 additions and 0 deletions
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src/include/random.h Normal file
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/*
* This file is part of the coreboot project.
*
* Copyright 2017 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef _RANDOM_H_
#define _RANDOM_H_
#include <stdint.h>
/*
* Generates a 32/64 bit random number respectively.
* return 0 on success and -1 on error.
*/
int get_random_number_32(uint32_t *rand);
int get_random_number_64(uint64_t *rand);
#endif /* _RANDOM_H_ */