mirror of
https://github.com/intel/linux-sgx
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Li, Xun
102 lines
3.1 KiB
C++
102 lines
3.1 KiB
C++
/*
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* Copyright (C) 2011-2018 Intel Corporation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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/* Please add external/rdrand into INCLUDE path and correpondent library to project */
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#include <stdint.h>
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#include <memory.h>
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#include <stdlib.h>
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#include "sgx.h"
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#include "sgx_defs.h"
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#include "se_wrapper.h"
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#include "rdrand.h"
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#include "cpuid.h"
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#include <stdio.h>
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#ifndef UINT32_MAX
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#define UINT32_MAX 0xFFFFFFFFU
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#endif
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static int g_is_rdrand_supported=-1;
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#define RDRAND_MASK 0x40000000
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static int rdrand_cpuid()
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{
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int info[4] = {-1, -1, -1, -1};
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/* Are we on an Intel processor? */
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__cpuid(info, 0);
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if (memcmp(&info[1], "Genu", 4) != 0 ||
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memcmp(&info[3], "ineI", 4) != 0 ||
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memcmp(&info[2], "ntel", 4) != 0 ) {
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return 0;
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}
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/* Do we have RDRAND? */
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__cpuid(info, /*feature bits*/1);
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int ecx = info[2];
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if ((ecx & RDRAND_MASK) == RDRAND_MASK)
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return 1;
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else
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return 0;
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}
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extern "C" sgx_status_t SGXAPI sgx_read_rand(uint8_t *buf, size_t size)
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{
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if(buf == NULL || size == 0 || size> UINT32_MAX ){
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return SGX_ERROR_INVALID_PARAMETER;
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}
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if(g_is_rdrand_supported==-1){
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g_is_rdrand_supported = rdrand_cpuid();
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}
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if(!g_is_rdrand_supported){
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uint32_t i;
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for(i=0;i<(uint32_t)size;++i){
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buf[i]=(uint8_t)rand();
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}
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}else{
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int rd_ret =rdrand_get_bytes((uint32_t)size, buf);
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if(rd_ret != RDRAND_SUCCESS){
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rd_ret = rdrand_get_bytes((uint32_t)size, buf);
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if(rd_ret != RDRAND_SUCCESS){
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return SGX_ERROR_UNEXPECTED;
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}
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}
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}
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return SGX_SUCCESS;
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}
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