// ECB Process blocks
inline void Mode_BASE::ECB_Process(byte* out, const byte* in, word32 sz)
{
word32 blocks = sz / blockSz_;
while (blocks--) {
ProcessAndXorBlock(in, 0, out);
out += blockSz_;
in += blockSz_;
}
}
void BlockTransformation::ProcessAndXorMultipleBlocks(const byte *inBlocks, const byte *xorBlocks, byte *outBlocks, unsigned int numberOfBlocks) const
{
unsigned int blockSize = BlockSize();
while (numberOfBlocks--)
{
ProcessAndXorBlock(inBlocks, xorBlocks, outBlocks);
inBlocks += blockSize;
outBlocks += blockSize;
if (xorBlocks)
xorBlocks += blockSize;
}
}
// CBC Encrypt
inline void Mode_BASE::CBC_Encrypt(byte* out, const byte* in, word32 sz)
{
word32 blocks = sz / blockSz_;
while (blocks--) {
xorbuf(reg_, in, blockSz_);
ProcessAndXorBlock(reg_, 0, reg_);
memcpy(out, reg_, blockSz_);
out += blockSz_;
in += blockSz_;
}
}
size_t BlockTransformation::AdvancedProcessBlocks(const byte *inBlocks, const byte *xorBlocks, byte *outBlocks, size_t length, word32 flags) const
{
CRYPTOPP_ASSERT(inBlocks);
CRYPTOPP_ASSERT(outBlocks);
CRYPTOPP_ASSERT(length);
size_t blockSize = BlockSize();
size_t inIncrement = (flags & (BT_InBlockIsCounter|BT_DontIncrementInOutPointers)) ? 0 : blockSize;
size_t xorIncrement = xorBlocks ? blockSize : 0;
size_t outIncrement = (flags & BT_DontIncrementInOutPointers) ? 0 : blockSize;
if (flags & BT_ReverseDirection)
{
CRYPTOPP_ASSERT(length % blockSize == 0);
inBlocks += length - blockSize;
xorBlocks += length - blockSize;
outBlocks += length - blockSize;
inIncrement = 0-inIncrement;
xorIncrement = 0-xorIncrement;
outIncrement = 0-outIncrement;
}
while (length >= blockSize)
{
if (flags & BT_XorInput)
{
// Coverity finding. However, xorBlocks is never NULL if BT_XorInput.
CRYPTOPP_ASSERT(xorBlocks);
#if defined(__COVERITY__)
if (xorBlocks)
#endif
xorbuf(outBlocks, xorBlocks, inBlocks, blockSize);
ProcessBlock(outBlocks);
}
else
{
// xorBlocks can be NULL. See, for example, ECB_OneWay::ProcessData.
ProcessAndXorBlock(inBlocks, xorBlocks, outBlocks);
}
if (flags & BT_InBlockIsCounter)
const_cast<byte *>(inBlocks)[blockSize-1]++;
inBlocks += inIncrement;
outBlocks += outIncrement;
xorBlocks += xorIncrement;
length -= blockSize;
}
return length;
}
// CBC Decrypt
inline void Mode_BASE::CBC_Decrypt(byte* out, const byte* in, word32 sz)
{
word32 blocks = sz / blockSz_;
byte hold[MaxBlockSz];
while (blocks--) {
memcpy(tmp_, in, blockSz_);
ProcessAndXorBlock(tmp_, 0, out);
xorbuf(out, reg_, blockSz_);
memcpy(hold, reg_, blockSz_); // swap reg_ and tmp_
memcpy(reg_, tmp_, blockSz_);
memcpy(tmp_, hold, blockSz_);
out += blockSz_;
in += blockSz_;
}
}
size_t BlockTransformation::AdvancedProcessBlocks(const byte *inBlocks, const byte *xorBlocks, byte *outBlocks, size_t length, word32 flags) const
{
size_t blockSize = BlockSize();
size_t inIncrement = (flags & (BT_InBlockIsCounter|BT_DontIncrementInOutPointers)) ? 0 : blockSize;
size_t xorIncrement = xorBlocks ? blockSize : 0;
size_t outIncrement = (flags & BT_DontIncrementInOutPointers) ? 0 : blockSize;
if (flags & BT_ReverseDirection)
{
assert(length % blockSize == 0);
inBlocks += length - blockSize;
xorBlocks += length - blockSize;
outBlocks += length - blockSize;
inIncrement = 0-inIncrement;
xorIncrement = 0-xorIncrement;
outIncrement = 0-outIncrement;
}
while (length >= blockSize)
{
if (flags & BT_XorInput)
{
xorbuf(outBlocks, xorBlocks, inBlocks, blockSize);
ProcessBlock(outBlocks);
}
else
ProcessAndXorBlock(inBlocks, xorBlocks, outBlocks);
if (flags & BT_InBlockIsCounter)
const_cast<byte *>(inBlocks)[blockSize-1]++;
inBlocks += inIncrement;
outBlocks += outIncrement;
xorBlocks += xorIncrement;
length -= blockSize;
}
return length;
}
