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Windows Driver: correctly save and restore extended processor state when performing AVX operations on Windows 7 and later. Enhance readability of code handling save/restore of floating point state.

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This commit is contained in:
Mounir IDRASSI
2017-07-04 02:05:11 +02:00
parent c2f6190627
commit 89efcdb8cd
8 changed files with 201 additions and 39 deletions
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4
src/Crypto/GostCipher.c
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@@ -96,7 +96,7 @@ void gost_set_key(const byte *key, gost_kds *ks, int useDynamicSbox)
byte sbox_seed[64];
#if defined (DEVICE_DRIVER) && !defined (_WIN64)
KFLOATING_SAVE floatingPointState;
NTSTATUS saveStatus = STATUS_SUCCESS;
NTSTATUS saveStatus = STATUS_INVALID_PARAMETER;
if (HasSSE2() || HasSSE41())
saveStatus = KeSaveFloatingPointState (&floatingPointState);
#endif
@@ -106,7 +106,7 @@ void gost_set_key(const byte *key, gost_kds *ks, int useDynamicSbox)
STREEBOG_finalize(&sctx, sbox_seed);
#if defined (DEVICE_DRIVER) && !defined (_WIN64)
if (NT_SUCCESS (saveStatus) && (HasSSE2() || HasSSE41()))
if (NT_SUCCESS (saveStatus))
KeRestoreFloatingPointState (&floatingPointState);
#endif