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Windows: Use Hardware RNG based on CPU timing jitter "Jitterentropy" by Stephan Mueller as a good alternative to RDRAND (http://www.chronox.de/jent.html, smueller@chronox.de)

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This commit is contained in:
Mounir IDRASSI
2019-02-12 18:49:12 +01:00
parent a5943c07fb
commit 86f0fde6e7
12 changed files with 1084 additions and 5 deletions
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16
src/Driver/Ntdriver.c
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@@ -32,6 +32,7 @@
#include "VolumeFilter.h"
#include "cpu.h"
#include "rdrand.h"
#include "jitterentropy.h"
#include <tchar.h>
#include <initguid.h>
@@ -162,7 +163,7 @@ void GetDriverRandomSeed (unsigned char* pbRandSeed, size_t cbRandSeed)
while (cbRandSeed)
{
WHIRLPOOL_init (&tctx);
// we hash current content of digest buffer which is initialized the first time
// we hash current content of digest buffer which is uninitialized the first time
WHIRLPOOL_add (digest, WHIRLPOOL_DIGESTSIZE, &tctx);
// we use various time information as source of entropy
@@ -174,6 +175,19 @@ void GetDriverRandomSeed (unsigned char* pbRandSeed, size_t cbRandSeed)
iSeed.QuadPart = KeQueryInterruptTime ();
WHIRLPOOL_add ((unsigned char *) &(iSeed.QuadPart), sizeof(iSeed.QuadPart), &tctx);
/* use JitterEntropy library to get good quality random bytes based on CPU timing jitter */
if (0 == jent_entropy_init ())
{
struct rand_data *ec = jent_entropy_collector_alloc (1, 0);
if (ec)
{
ssize_t rndLen = jent_read_entropy (ec, (char*) digest, sizeof (digest));
if (rndLen > 0)
WHIRLPOOL_add (digest, (unsigned int) rndLen, &tctx);
jent_entropy_collector_free (ec);
}
}
// use RDSEED or RDRAND from CPU as source of entropy if enabled
if ( IsCpuRngEnabled() &&
( (HasRDSEED() && RDSEED_getBytes (digest, sizeof (digest)))