diff options
| -rw-r--r-- | src/Volume/Volume.cpp | 32 |
1 files changed, 16 insertions, 16 deletions
diff --git a/src/Volume/Volume.cpp b/src/Volume/Volume.cpp index d4d799d1..74d102a6 100644 --- a/src/Volume/Volume.cpp +++ b/src/Volume/Volume.cpp @@ -316,6 +316,7 @@ namespace VeraCrypt uint64 length = buffer.Size(); uint64 hostOffset = VolumeDataOffset + byteOffset; + size_t bufferOffset = 0; if (length % SectorSize != 0 || byteOffset % SectorSize != 0) throw ParameterIncorrect (SRC_POS); @@ -323,31 +324,30 @@ namespace VeraCrypt if (VolumeFile->ReadAt (buffer, hostOffset) != length) throw MissingVolumeData (SRC_POS); - if (EncryptionNotCompleted) + // first sector can be unencrypted in some cases (e.g. windows repair) + // detect this case by looking for NTFS header + if (SystemEncryption && (hostOffset == 0) && ((BE64 (*(uint64 *) buffer.Get ())) == 0xEB52904E54465320ULL)) { - // if encryption is not complete, we decrypt only the encrypted sectors - if (hostOffset < EncryptedDataSize) - { - size_t bufferOffset = 0; - - // first sector is not encrypted in case of incomplete encryption - if (hostOffset == 0) - { - bufferOffset = (size_t) SectorSize; - hostOffset += SectorSize; - length -= SectorSize; - } + bufferOffset = (size_t) SectorSize; + hostOffset += SectorSize; + length -= SectorSize; + } - if (length && (hostOffset < EncryptedDataSize)) + if (length) + { + if (EncryptionNotCompleted) + { + // if encryption is not complete, we decrypt only the encrypted sectors + if (hostOffset < EncryptedDataSize) { uint64 encryptedLength = VC_MIN (length, (EncryptedDataSize - hostOffset)); EA->DecryptSectors (buffer.GetRange (bufferOffset, encryptedLength), hostOffset / SectorSize, encryptedLength / SectorSize, SectorSize); } } + else + EA->DecryptSectors (buffer.GetRange (bufferOffset, length), hostOffset / SectorSize, length / SectorSize, SectorSize); } - else - EA->DecryptSectors (buffer, hostOffset / SectorSize, length / SectorSize, SectorSize); TotalDataRead += length; } |