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Windows Driver: save FPU state in 32-bit mode before run Whirlpool SSE implementation to avoid issues (https://msdn.microsoft.com/fr-fr/library/ff565388(v=vs.85).aspx)

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This commit is contained in:
Mounir IDRASSI
2016-06-17 23:50:44 +02:00
parent bdc5782f16
commit 2faa1290c0
2 changed files with 34 additions and 0 deletions
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22
src/Common/Pkcs5.c
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@@ -19,6 +19,7 @@
#ifndef TC_WINDOWS_BOOT
#include "Sha2.h"
#include "Whirlpool.h"
#include "cpu.h"
#include "misc.h"
#else
#pragma optimize ("t", on)
@@ -744,6 +745,12 @@ void hmac_whirlpool
char* buf = hmac.k;
int b;
char key[WHIRLPOOL_DIGESTSIZE];
#if defined (DEVICE_DRIVER) && !defined (_WIN64)
KFLOATING_SAVE floatingPointState;
NTSTATUS saveStatus = STATUS_SUCCESS;
if (HasISSE())
saveStatus = KeSaveFloatingPointState (&floatingPointState);
#endif
/* If the key is longer than the hash algorithm block size,
let key = whirlpool(key), as per HMAC specifications. */
if (lk > WHIRLPOOL_BLOCKSIZE)
@@ -784,6 +791,11 @@ void hmac_whirlpool
WHIRLPOOL_add ((unsigned char *) buf, WHIRLPOOL_BLOCKSIZE * 8, ctx);
hmac_whirlpool_internal(k, lk, d, ld, &hmac);
#if defined (DEVICE_DRIVER) && !defined (_WIN64)
if (NT_SUCCESS (saveStatus) && HasISSE())
KeRestoreFloatingPointState (&floatingPointState);
#endif
/* Prevent leaks */
burn(&hmac, sizeof(hmac));
}
@@ -821,6 +833,12 @@ void derive_key_whirlpool (char *pwd, int pwd_len, char *salt, int salt_len, uin
char* buf = hmac.k;
char key[WHIRLPOOL_DIGESTSIZE];
int b, l, r;
#if defined (DEVICE_DRIVER) && !defined (_WIN64)
KFLOATING_SAVE floatingPointState;
NTSTATUS saveStatus = STATUS_SUCCESS;
if (HasISSE())
saveStatus = KeSaveFloatingPointState (&floatingPointState);
#endif
/* If the password is longer than the hash algorithm block size,
let pwd = whirlpool(pwd), as per HMAC specifications. */
if (pwd_len > WHIRLPOOL_BLOCKSIZE)
@@ -883,6 +901,10 @@ void derive_key_whirlpool (char *pwd, int pwd_len, char *salt, int salt_len, uin
derive_u_whirlpool (pwd, pwd_len, salt, salt_len, iterations, b, &hmac);
memcpy (dk, hmac.u, r);
#if defined (DEVICE_DRIVER) && !defined (_WIN64)
if (NT_SUCCESS (saveStatus) && HasISSE())
KeRestoreFloatingPointState (&floatingPointState);
#endif
/* Prevent possible leaks. */
burn (&hmac, sizeof(hmac));