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| author | Mounir IDRASSI <mounir.idrassi@idrix.fr> | 2013-06-22 16:16:13 +0200 |
|---|---|---|
| committer | Mounir IDRASSI <mounir.idrassi@idrix.fr> | 2014-11-08 23:18:07 +0100 |
| commit | c606f0866c3a2a5db3ef9bc41738ef33eb9612a9 (patch) | |
| tree | 5847c644cdfff3c1dd55b88b565448087ae89f11 /src/Boot/Windows/BootEncryptedIo.cpp | |
| download | VeraCrypt-c606f0866c3a2a5db3ef9bc41738ef33eb9612a9.tar.gz VeraCrypt-c606f0866c3a2a5db3ef9bc41738ef33eb9612a9.zip | |
Add original TrueCrypt 7.1a sources
Diffstat (limited to 'src/Boot/Windows/BootEncryptedIo.cpp')
| -rw-r--r-- | src/Boot/Windows/BootEncryptedIo.cpp | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/src/Boot/Windows/BootEncryptedIo.cpp b/src/Boot/Windows/BootEncryptedIo.cpp new file mode 100644 index 00000000..ff048991 --- /dev/null +++ b/src/Boot/Windows/BootEncryptedIo.cpp @@ -0,0 +1,128 @@ +/*
+ Copyright (c) 2008 TrueCrypt Developers Association. All rights reserved.
+
+ Governed by the TrueCrypt License 3.0 the full text of which is contained in
+ the file License.txt included in TrueCrypt binary and source code distribution
+ packages.
+*/
+
+#include "Crypto.h"
+#include "Platform.h"
+#include "BootConfig.h"
+#include "BootDebug.h"
+#include "BootDefs.h"
+#include "BootDiskIo.h"
+#include "BootEncryptedIo.h"
+
+
+BiosResult ReadEncryptedSectors (uint16 destSegment, uint16 destOffset, byte drive, uint64 sector, uint16 sectorCount)
+{
+ BiosResult result;
+ bool decrypt = true;
+
+ if (BootCryptoInfo->hiddenVolume)
+ {
+ if (ReadWritePartiallyCoversEncryptedArea (sector, sectorCount))
+ return BiosResultInvalidFunction;
+
+ if (sector >= EncryptedVirtualPartition.StartSector && sector <= EncryptedVirtualPartition.EndSector)
+ {
+ // Remap the request to the hidden volume
+ sector -= EncryptedVirtualPartition.StartSector;
+ sector += HiddenVolumeStartSector;
+ }
+ else
+ decrypt = false;
+ }
+
+ result = ReadSectors (destSegment, destOffset, drive, sector, sectorCount);
+
+ if (result != BiosResultSuccess || !decrypt)
+ return result;
+
+ if (BootCryptoInfo->hiddenVolume)
+ {
+ // Convert sector number to data unit number of the hidden volume
+ sector -= HiddenVolumeStartSector;
+ sector += HiddenVolumeStartUnitNo;
+ }
+
+ if (drive == EncryptedVirtualPartition.Drive)
+ {
+ while (sectorCount-- > 0)
+ {
+ if (BootCryptoInfo->hiddenVolume
+ || (sector >= EncryptedVirtualPartition.StartSector && sector <= EncryptedVirtualPartition.EndSector))
+ {
+ AcquireSectorBuffer();
+ CopyMemory (destSegment, destOffset, SectorBuffer, TC_LB_SIZE);
+
+ DecryptDataUnits (SectorBuffer, §or, 1, BootCryptoInfo);
+
+ CopyMemory (SectorBuffer, destSegment, destOffset, TC_LB_SIZE);
+ ReleaseSectorBuffer();
+ }
+
+ ++sector;
+ destOffset += TC_LB_SIZE;
+ }
+ }
+
+ return result;
+}
+
+
+BiosResult WriteEncryptedSectors (uint16 sourceSegment, uint16 sourceOffset, byte drive, uint64 sector, uint16 sectorCount)
+{
+ BiosResult result;
+ AcquireSectorBuffer();
+ uint64 dataUnitNo;
+ uint64 writeOffset;
+
+ dataUnitNo = sector;
+ writeOffset.HighPart = 0;
+ writeOffset.LowPart = 0;
+
+ if (BootCryptoInfo->hiddenVolume)
+ {
+ if (ReadWritePartiallyCoversEncryptedArea (sector, sectorCount))
+ return BiosResultInvalidFunction;
+
+ // Remap the request to the hidden volume
+ writeOffset = HiddenVolumeStartSector;
+ writeOffset -= EncryptedVirtualPartition.StartSector;
+ dataUnitNo -= EncryptedVirtualPartition.StartSector;
+ dataUnitNo += HiddenVolumeStartUnitNo;
+ }
+
+ while (sectorCount-- > 0)
+ {
+ CopyMemory (sourceSegment, sourceOffset, SectorBuffer, TC_LB_SIZE);
+
+ if (drive == EncryptedVirtualPartition.Drive && sector >= EncryptedVirtualPartition.StartSector && sector <= EncryptedVirtualPartition.EndSector)
+ {
+ EncryptDataUnits (SectorBuffer, &dataUnitNo, 1, BootCryptoInfo);
+ }
+
+ result = WriteSectors (SectorBuffer, drive, sector + writeOffset, 1);
+
+ if (result != BiosResultSuccess)
+ break;
+
+ ++sector;
+ ++dataUnitNo;
+ sourceOffset += TC_LB_SIZE;
+ }
+
+ ReleaseSectorBuffer();
+ return result;
+}
+
+
+static bool ReadWritePartiallyCoversEncryptedArea (const uint64 §or, uint16 sectorCount)
+{
+ uint64 readWriteEnd = sector + --sectorCount;
+
+ return ((sector < EncryptedVirtualPartition.StartSector && readWriteEnd >= EncryptedVirtualPartition.StartSector)
+ || (sector >= EncryptedVirtualPartition.StartSector && readWriteEnd > EncryptedVirtualPartition.EndSector));
+}
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