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| author | Mounir IDRASSI <mounir.idrassi@idrix.fr> | 2017-07-04 02:05:11 +0200 |
|---|---|---|
| committer | Mounir IDRASSI <mounir.idrassi@idrix.fr> | 2017-07-04 02:26:24 +0200 |
| commit | 89efcdb8cd95ea798187fe4062a73fa5d2fca456 (patch) | |
| tree | 5b87e340ffc7fb6ad8a8859750aa388487188f8f /src/Crypto/Camellia.c | |
| parent | c2f6190627de27903264258c6ea8ee72199c0c81 (diff) | |
| download | VeraCrypt-89efcdb8cd95ea798187fe4062a73fa5d2fca456.tar.gz VeraCrypt-89efcdb8cd95ea798187fe4062a73fa5d2fca456.zip | |
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.
Diffstat (limited to 'src/Crypto/Camellia.c')
| -rw-r--r-- | src/Crypto/Camellia.c | 32 |
1 files changed, 25 insertions, 7 deletions
diff --git a/src/Crypto/Camellia.c b/src/Crypto/Camellia.c index f74130cd..49bc7670 100644 --- a/src/Crypto/Camellia.c +++ b/src/Crypto/Camellia.c @@ -1096,15 +1096,24 @@ void camellia_decrypt(const unsigned __int8 *inBlock, unsigned __int8 *outBlock void camellia_encrypt_blocks(unsigned __int8 *instance, const byte* in_blk, byte* out_blk, uint32 blockCount) { #if !defined (_UEFI) - if (IsCpuIntel() && IsAesHwCpuSupported () && HasSAVX()) /* on AMD cpu, AVX is too slow */ + if ((blockCount >= 16) && IsCpuIntel() && IsAesHwCpuSupported () && HasSAVX()) /* on AMD cpu, AVX is too slow */ { - while (blockCount >= 16) +#if defined (TC_WINDOWS_DRIVER) + XSTATE_SAVE SaveState; + if (NT_SUCCESS (KeSaveExtendedProcessorState(XSTATE_MASK_GSSE, &SaveState))) { - camellia_ecb_enc_16way (instance, out_blk, in_blk); - out_blk += 16 * 16; - in_blk += 16 * 16; - blockCount -= 16; +#endif + while (blockCount >= 16) + { + camellia_ecb_enc_16way (instance, out_blk, in_blk); + out_blk += 16 * 16; + in_blk += 16 * 16; + blockCount -= 16; + } +#if defined (TC_WINDOWS_DRIVER) + KeRestoreExtendedProcessorState(&SaveState); } +#endif } #endif @@ -1123,8 +1132,13 @@ void camellia_encrypt_blocks(unsigned __int8 *instance, const byte* in_blk, byte void camellia_decrypt_blocks(unsigned __int8 *instance, const byte* in_blk, byte* out_blk, uint32 blockCount) { #if !defined (_UEFI) - if (IsCpuIntel() && IsAesHwCpuSupported () && HasSAVX()) /* on AMD cpu, AVX is too slow */ + if ((blockCount >= 16) && IsCpuIntel() && IsAesHwCpuSupported () && HasSAVX()) /* on AMD cpu, AVX is too slow */ { +#if defined (TC_WINDOWS_DRIVER) + XSTATE_SAVE SaveState; + if (NT_SUCCESS (KeSaveExtendedProcessorState(XSTATE_MASK_GSSE, &SaveState))) + { +#endif while (blockCount >= 16) { camellia_ecb_dec_16way (instance, out_blk, in_blk); @@ -1132,6 +1146,10 @@ void camellia_decrypt_blocks(unsigned __int8 *instance, const byte* in_blk, byte in_blk += 16 * 16; blockCount -= 16; } +#if defined (TC_WINDOWS_DRIVER) + KeRestoreExtendedProcessorState(&SaveState); + } +#endif } #endif |