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72 lines
2.4 KiB
C
72 lines
2.4 KiB
C
// Checks if CPU has support of AES instructions
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//
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// @author kryukov@frtk.ru
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//
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// Source code from:
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//
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// https://github.com/pavelkryukov/putty-aes-ni/blob/master/aescpuid.c
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//
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// MIT License
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// Copyright (c) 2012-2021 Pavel Kryukov, Maxim Kuznetsov, and Svyatoslav Kuzmich
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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//
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#include <stdbool.h>
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#include <stdio.h>
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#if defined(__x86_64__) || defined(__i386)
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#if defined(__clang__) || defined(__GNUC__)
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#include <cpuid.h>
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static bool platform_aes_hw_available(void) {
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unsigned int CPUInfo[4];
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__cpuid(1, CPUInfo[0], CPUInfo[1], CPUInfo[2], CPUInfo[3]);
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return (CPUInfo[2] & (1 << 25)) != 0 && (CPUInfo[2] & (1 << 19)) != 0; /* Check AES and SSE4.1 */
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}
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#else /* defined(__clang__) || defined(__GNUC__) */
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static bool platform_aes_hw_available(void) {
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unsigned int CPUInfo[4];
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__cpuid(CPUInfo, 1);
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return (CPUInfo[2] & (1 << 25)) != 0 && (CPUInfo[2] & (1 << 19)) != 0; /* Check AES and SSE4.1 */
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}
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#endif /* defined(__clang__) || defined(__GNUC__) */
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#else /* defined(__x86_64__) || defined(__i386) */
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#include <sys/auxv.h>
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#include <asm/hwcap.h>
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static bool platform_aes_hw_available(void) {
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#if defined HWCAP_AES
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return (getauxval(AT_HWCAP) & HWCAP_AES) != 0;
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#elif defined HWCAP2_AES
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return (getauxval(AT_HWCAP2) & HWCAP2_AES) != 0;
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#else
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return false;
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#endif
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}
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#endif /* defined(__x86_64__) || defined(__i386) */
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