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aescpuid.c
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aescpuid.c
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/**
* cpuid.c
*
* Checks if CPU has support of AES instructions
*
* @author kryukov@frtk.ru
*
* For Putty AES NI project
* http://putty-aes-ni.googlecode.com/
*/
#include <stdbool.h>
#include <stdio.h>
#if defined(__x86_64__) || defined(__i386)
#if defined(__clang__) || defined(__GNUC__)
#include <cpuid.h>
bool platform_aes_hw_available()
{
unsigned int CPUInfo[4];
__cpuid(1, CPUInfo[0], CPUInfo[1], CPUInfo[2], CPUInfo[3]);
return (CPUInfo[2] & (1 << 25)) != 0 && (CPUInfo[2] & (1 << 19)) != 0; /* Check AES and SSE4.1 */
}
#else /* defined(__clang__) || defined(__GNUC__) */
bool platform_aes_hw_available()
{
unsigned int CPUInfo[4];
__cpuid(CPUInfo, 1);
return (CPUInfo[2] & (1 << 25)) != 0 && (CPUInfo[2] & (1 << 19)) != 0; /* Check AES and SSE4.1 */
}
#endif /* defined(__clang__) || defined(__GNUC__) */
#else /* defined(__x86_64__) || defined(__i386) */
#include <sys/auxv.h>
#include <asm/hwcap.h>
bool platform_aes_hw_available(void)
{
#if defined HWCAP_AES
return (getauxval(AT_HWCAP) & HWCAP_AES) != 0;
#elif defined HWCAP2_AES
return (getauxval(AT_HWCAP2) & HWCAP2_AES) != 0;
#else
return false;
#endif
}
#endif /* defined(__x86_64__) || defined(__i386) */
int main(int argc, char ** argv)
{
const bool support = platform_aes_hw_available();
printf("This CPU %s AES-NI\n", support ? "supports" : "does not support");
return support ? 0 : 1;
}