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FIPS Revalidation 

1. Update the GenerateSeed() function for RDSEED on Windows to use the intrinsic function instead of inline assembly.
This commit is contained in:
John Safranek 2018-04-10 11:47:46 -07:00
parent 4f1dd3b9a7
commit b120a27c3e
1 changed files with 46 additions and 7 deletions
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53
wolfcrypt/src/random.c
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@ -163,6 +163,10 @@ int wc_RNG_GenerateByte(WC_RNG* rng, byte* b)
#ifdef HAVE_INTEL_RDRAND
static int wc_GenerateRand_IntelRD(OS_Seed* os, byte* output, word32 sz);
#endif
#ifdef USE_WINDOWS_API
#include <immintrin.h>
#endif /* USE_WINDOWS_API */
#endif
/* Start NIST DRBG code */
@ -1019,14 +1023,31 @@ int wc_FreeNetRandom(void)
#ifdef HAVE_INTEL_RDSEED
/* return 0 on success */
static INLINE int IntelRDseed64(word64* seed)
{
unsigned char ok;
#ifndef USE_WINDOWS_API
__asm__ volatile("rdseed %0; setc %1":"=r"(*seed), "=qm"(ok));
return (ok) ? 0 : -1;
}
/* return 0 on success */
static INLINE int IntelRDseed64(word64* seed)
{
unsigned char ok;
__asm__ volatile("rdseed %0; setc %1":"=r"(*seed), "=qm"(ok));
return (ok) ? 0 : -1;
}
#else /* USE_WINDOWS_API */
/* The compiler Visual Studio uses does not allow inline assembly.
* It does allow for Intel intrinsic functions. */
/* return 0 on success */
static INLINE int IntelRDseed64(word64* seed)
{
int ok;
ok = _rdseed64_step(seed);
return (ok) ? 0 : -1;
}
#endif /* USE_WINDOWS_API */
/* return 0 on success */
static INLINE int IntelRDseed64_r(word64* rnd)
@ -1073,6 +1094,8 @@ static int wc_GenerateSeed_IntelRD(OS_Seed* os, byte* output, word32 sz)
#ifdef HAVE_INTEL_RDRAND
#ifndef USE_WINDOWS_API
/* return 0 on success */
static INLINE int IntelRDrand64(word64 *rnd)
{
@ -1083,6 +1106,22 @@ static INLINE int IntelRDrand64(word64 *rnd)
return (ok) ? 0 : -1;
}
#else /* USE_WINDOWS_API */
/* The compiler Visual Studio uses does not allow inline assembly.
* It does allow for Intel intrinsic functions. */
/* return 0 on success */
static INLINE int IntelRDrand64(word64 *rnd)
{
int ok;
ok = _rdrand64_step(rnd);
return (ok) ? 0 : -1;
}
#endif /* USE_WINDOWS_API */
/* return 0 on success */
static INLINE int IntelRDrand64_r(word64 *rnd)
{