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Add TrueCrypt 7.1a MacOSX/Linux specific source files.
This commit is contained in:
Mounir IDRASSI
335
src/Volume/EncryptionModeCBC.cpp
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335
src/Volume/EncryptionModeCBC.cpp
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/*
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Copyright (c) 2008 TrueCrypt Developers Association. All rights reserved.
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Governed by the TrueCrypt License 3.0 the full text of which is contained in
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the file License.txt included in TrueCrypt binary and source code distribution
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packages.
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*/
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#include "Platform/Memory.h"
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#include "Common/Crc.h"
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#include "Common/Endian.h"
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#include "EncryptionModeCBC.h"
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namespace TrueCrypt
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{
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void EncryptionModeCBC::Decrypt (byte *data, uint64 length) const
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{
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if_debug (ValidateState ());
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if_debug (ValidateParameters (data, length));
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if (IsOuterCBC (Ciphers))
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{
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DecryptBuffer (data, length, Ciphers, (uint32 *) IV.Ptr(), (uint32 *) (IV.Ptr() + WhiteningIVOffset));
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}
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else
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{
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for (CipherList::const_reverse_iterator iCipherList = Ciphers.rbegin();
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iCipherList != Ciphers.rend();
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++iCipherList)
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{
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CipherList cl;
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cl.push_back (*iCipherList);
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DecryptBuffer (data, length, cl, (uint32 *) IV.Ptr(), (uint32 *) (IV.Ptr() + WhiteningIVOffset));
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}
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}
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}
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void EncryptionModeCBC::DecryptBuffer (byte *data, uint64 length, const CipherList &ciphers, const uint32 *iv, const uint32 *whitening) const
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{
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size_t blockSize = ciphers.front()->GetBlockSize();
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if (blockSize != 8 && blockSize != 16)
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throw ParameterIncorrect (SRC_POS);
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uint32 *data32 = (uint32 *) data;
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uint32 bufIV[4];
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uint32 ct[4];
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uint64 i;
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bufIV[0] = iv[0];
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bufIV[1] = iv[1];
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if (blockSize == 16)
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{
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bufIV[2] = iv[2];
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bufIV[3] = iv[3];
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}
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for (i = 0; i < length / blockSize; i++)
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{
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// Dewhitening
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data32[0] ^= whitening[0];
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data32[1] ^= whitening[1];
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if (blockSize == 16)
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{
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data32[2] ^= whitening[0];
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data32[3] ^= whitening[1];
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}
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// CBC
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ct[0] = data32[0];
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ct[1] = data32[1];
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if (blockSize == 16)
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{
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ct[2] = data32[2];
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ct[3] = data32[3];
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}
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for (CipherList::const_reverse_iterator iCipherList = ciphers.rbegin();
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iCipherList != ciphers.rend();
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++iCipherList)
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{
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const Cipher &c = **iCipherList;
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if (c.GetBlockSize () != blockSize)
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throw ParameterIncorrect (SRC_POS);
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c.DecryptBlock ((byte *) data32);
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}
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// CBC
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data32[0] ^= bufIV[0];
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data32[1] ^= bufIV[1];
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bufIV[0] = ct[0];
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bufIV[1] = ct[1];
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if (blockSize == 16)
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{
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data32[2] ^= bufIV[2];
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data32[3] ^= bufIV[3];
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bufIV[2] = ct[2];
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bufIV[3] = ct[3];
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}
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data32 += blockSize / sizeof(*data32);
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}
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Memory::Erase (bufIV, sizeof (bufIV));
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Memory::Erase (ct, sizeof (ct));
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}
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void EncryptionModeCBC::DecryptSectorsCurrentThread (byte *data, uint64 sectorIndex, uint64 sectorCount, size_t sectorSize) const
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{
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if_debug (ValidateState ());
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if_debug (ValidateParameters (data, sectorCount, sectorSize));
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uint32 sectorIV[4];
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uint32 sectorWhitening[2];
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while (sectorCount--)
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{
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if (IsOuterCBC (Ciphers))
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{
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InitSectorIVAndWhitening (sectorIndex, Ciphers.front()->GetBlockSize(), (uint64 *) IV.Ptr(), sectorIV, sectorWhitening);
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DecryptBuffer (data, sectorSize, Ciphers, sectorIV, sectorWhitening);
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}
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else
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{
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for (CipherList::const_reverse_iterator iCipherList = Ciphers.rbegin();
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iCipherList != Ciphers.rend();
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++iCipherList)
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{
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const Cipher &c = **iCipherList;
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CipherList cl;
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cl.push_back (*iCipherList);
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InitSectorIVAndWhitening (sectorIndex, c.GetBlockSize(), (uint64 *) IV.Ptr(), sectorIV, sectorWhitening);
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DecryptBuffer (data, sectorSize, cl, sectorIV, sectorWhitening);
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}
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}
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data += sectorSize;
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sectorIndex++;
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}
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Memory::Erase (sectorIV, sizeof (sectorIV));
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Memory::Erase (sectorWhitening, sizeof (sectorWhitening));
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}
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void EncryptionModeCBC::Encrypt (byte *data, uint64 length) const
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{
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if_debug (ValidateState ());
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if_debug (ValidateParameters (data, length));
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if (IsOuterCBC (Ciphers))
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{
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EncryptBuffer (data, length, Ciphers, (uint32 *) IV.Ptr(), (uint32 *) (IV.Ptr() + WhiteningIVOffset));
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}
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else
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{
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for (CipherList::const_iterator iCipherList = Ciphers.begin();
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iCipherList != Ciphers.end();
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++iCipherList)
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{
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CipherList cl;
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cl.push_back (*iCipherList);
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EncryptBuffer (data, length, cl, (uint32 *) IV.Ptr(), (uint32 *) (IV.Ptr() + WhiteningIVOffset));
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}
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}
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}
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void EncryptionModeCBC::EncryptBuffer (byte *data, uint64 length, const CipherList &ciphers, const uint32 *iv, const uint32 *whitening) const
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{
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size_t blockSize = ciphers.front()->GetBlockSize();
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if (blockSize != 8 && blockSize != 16)
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throw ParameterIncorrect (SRC_POS);
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uint32 *data32 = (uint32 *) data;
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uint32 bufIV[4];
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uint64 i;
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bufIV[0] = iv[0];
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bufIV[1] = iv[1];
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if (blockSize == 16)
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{
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bufIV[2] = iv[2];
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bufIV[3] = iv[3];
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}
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for (i = 0; i < length / blockSize; i++)
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{
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data32[0] ^= bufIV[0];
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data32[1] ^= bufIV[1];
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if (blockSize == 16)
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{
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data32[2] ^= bufIV[2];
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data32[3] ^= bufIV[3];
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}
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for (CipherList::const_iterator iCipherList = ciphers.begin();
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iCipherList != ciphers.end();
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++iCipherList)
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{
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const Cipher &c = **iCipherList;
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if (c.GetBlockSize () != blockSize)
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throw ParameterIncorrect (SRC_POS);
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c.EncryptBlock ((byte *) data32);
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}
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bufIV[0] = data32[0];
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bufIV[1] = data32[1];
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if (blockSize == 16)
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{
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bufIV[2] = data32[2];
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bufIV[3] = data32[3];
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}
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data32[0] ^= whitening[0];
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data32[1] ^= whitening[1];
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if (blockSize == 16)
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{
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data32[2] ^= whitening[0];
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data32[3] ^= whitening[1];
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}
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data32 += blockSize / sizeof(*data32);
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}
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Memory::Erase (bufIV, sizeof (bufIV));
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}
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void EncryptionModeCBC::EncryptSectorsCurrentThread (byte *data, uint64 sectorIndex, uint64 sectorCount, size_t sectorSize) const
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{
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if_debug (ValidateState ());
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if_debug (ValidateParameters (data, sectorCount, sectorSize));
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uint32 sectorIV[4];
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uint32 sectorWhitening[2];
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while (sectorCount--)
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{
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if (IsOuterCBC (Ciphers))
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{
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InitSectorIVAndWhitening (sectorIndex, Ciphers.front()->GetBlockSize(), (uint64 *) IV.Ptr(), sectorIV, sectorWhitening);
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EncryptBuffer (data, sectorSize, Ciphers, sectorIV, sectorWhitening);
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}
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else
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{
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for (CipherList::const_iterator iCipherList = Ciphers.begin();
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iCipherList != Ciphers.end();
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++iCipherList)
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{
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const Cipher &c = **iCipherList;
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CipherList cl;
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cl.push_back (*iCipherList);
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InitSectorIVAndWhitening (sectorIndex, c.GetBlockSize(), (uint64 *) IV.Ptr(), sectorIV, sectorWhitening);
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EncryptBuffer (data, sectorSize, cl, sectorIV, sectorWhitening);
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}
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}
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data += sectorSize;
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sectorIndex++;
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}
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Memory::Erase (sectorIV, sizeof (sectorIV));
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Memory::Erase (sectorWhitening, sizeof (sectorWhitening));
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}
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void EncryptionModeCBC::InitSectorIVAndWhitening (uint64 sectorIndex, size_t blockSize, const uint64 *ivSeed, uint32 *iv, uint32 *whitening) const
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{
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if (blockSize != 8 && blockSize != 16)
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throw ParameterIncorrect (SRC_POS);
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uint64 iv64[4];
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uint32 *iv32 = (uint32 *) iv64;
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iv64[0] = ivSeed[0] ^ Endian::Little (sectorIndex);
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iv64[1] = ivSeed[1] ^ Endian::Little (sectorIndex);
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iv64[2] = ivSeed[2] ^ Endian::Little (sectorIndex);
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if (blockSize == 16)
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{
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iv64[3] = ivSeed[3] ^ Endian::Little (sectorIndex);
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}
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iv[0] = iv32[0];
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iv[1] = iv32[1];
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if (blockSize == 8)
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{
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whitening[0] = Endian::Little ( crc32int ( &iv32[2] ) ^ crc32int ( &iv32[5] ) );
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whitening[1] = Endian::Little ( crc32int ( &iv32[3] ) ^ crc32int ( &iv32[4] ) );
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}
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else
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{
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iv[2] = iv32[2];
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iv[3] = iv32[3];
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whitening[0] = Endian::Little ( crc32int ( &iv32[4] ) ^ crc32int ( &iv32[7] ) );
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whitening[1] = Endian::Little ( crc32int ( &iv32[5] ) ^ crc32int ( &iv32[6] ) );
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}
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}
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bool EncryptionModeCBC::IsOuterCBC (const CipherList &ciphers) const
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{
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if (ciphers.size() < 2)
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return false;
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size_t blockSize = ciphers.front()->GetBlockSize();
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for (CipherList::const_iterator iCipherList = ciphers.begin();
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iCipherList != ciphers.end();
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++iCipherList)
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{
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const Cipher &c = **iCipherList;
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if (c.GetBlockSize() != blockSize)
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return false;
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}
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return true;
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}
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void EncryptionModeCBC::SetKey (const ConstBufferPtr &key)
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{
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if (key.Size() != GetKeySize ())
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throw ParameterIncorrect (SRC_POS);
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if (!KeySet)
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IV.Allocate (GetKeySize ());
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IV.CopyFrom (key);
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KeySet = true;
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}
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}
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