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Add check for buggy RDRAND (AMD Ryzen CPU case) even if we always use RDSEED instead of RDRAND when RDSEED is available (which is the case on modern CPUs)

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This commit is contained in:
Mounir IDRASSI
2019-10-30 08:45:01 +01:00
parent 7a35ecb154
commit 5ecff99edc
1 changed files with 13 additions and 0 deletions
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13
src/Crypto/cpu.c
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@@ -2,6 +2,7 @@
#include "cpu.h"
#include "misc.h"
#include "rdrand.h"
#ifndef EXCEPTION_EXECUTE_HANDLER
#define EXCEPTION_EXECUTE_HANDLER 1
@@ -387,6 +388,18 @@ void DetectX86Features()
}
}
/* Add check fur buggy RDRAND (AMD Ryzen case) even if we always use RDSEED instead of RDRAND when RDSEED available */
if (g_hasRDRAND)
{
if ( RDRAND_getBytes ((unsigned char*) cpuid, sizeof (cpuid))
&& (cpuid[0] == 0xFFFFFFFF) && (cpuid[1] == 0xFFFFFFFF)
&& (cpuid[2] == 0xFFFFFFFF) && (cpuid[3] == 0xFFFFFFFF)
)
{
g_hasRDRAND = 0;
}
}
if (!g_cacheLineSize)
g_cacheLineSize = CRYPTOPP_L1_CACHE_LINE_SIZE;