int Keccak_DuplexingFeedPartialInput(Keccak_DuplexInstance *instance, const unsigned char *in, unsigned int inByteLen)
{
const unsigned int rho_max = instance->rate - 2;
if ((instance->byteInputIndex+inByteLen)*8 > rho_max)
return 1;
if ((instance->byteInputIndex == 0) && (inByteLen >= KeccakF_laneInBytes)) {
KeccakF_StateXORLanes(instance->state, in, inByteLen/KeccakF_laneInBytes);
in += (inByteLen/KeccakF_laneInBytes)*KeccakF_laneInBytes;
instance->byteInputIndex += (inByteLen/KeccakF_laneInBytes)*KeccakF_laneInBytes;
inByteLen -= (inByteLen/KeccakF_laneInBytes)*KeccakF_laneInBytes;
}
while(inByteLen > 0) {
unsigned int offsetInLane = instance->byteInputIndex % KeccakF_laneInBytes;
unsigned int bytesInLane = KeccakF_laneInBytes - offsetInLane;
if (bytesInLane > inByteLen)
bytesInLane = inByteLen;
KeccakF_StateXORBytesInLane(instance->state, instance->byteInputIndex/KeccakF_laneInBytes, in, offsetInLane, bytesInLane);
in += bytesInLane;
instance->byteInputIndex += bytesInLane;
inByteLen -= bytesInLane;
}
return 0;
}
void Ket_WrapBlocks( void *state, const unsigned char *plaintext, unsigned char *ciphertext, unsigned int nBlocks )
{
unsigned char keystream[Ketje_BlockSize];
unsigned char plaintemp[Ketje_BlockSize];
unsigned char frameAndPaddingBits[1];
frameAndPaddingBits[0] = 0x08 | FRAMEBITS11;
while ( nBlocks-- != 0 )
{
KeccakF_StateExtractLanes(state, keystream, Ketje_BlockSize / KeccakF_laneInBytes);
plaintemp[0] = plaintext[0];
plaintemp[1] = plaintext[1];
#if (KeccakF_width == 400 )
plaintemp[2] = plaintext[2];
plaintemp[3] = plaintext[3];
#endif
*(ciphertext++) = *(plaintext++) ^ keystream[0];
*(ciphertext++) = *(plaintext++) ^ keystream[1];
#if (KeccakF_width == 400 )
*(ciphertext++) = *(plaintext++) ^ keystream[2];
*(ciphertext++) = *(plaintext++) ^ keystream[3];
#endif
KeccakF_StateXORLanes(state, plaintemp, Ketje_BlockSize / KeccakF_laneInBytes);
KeccakF_StateXORBytesInLane(state, Ketje_BlockSize / KeccakF_laneInBytes, frameAndPaddingBits, 0, 1);
KeccakP_StatePermute(state, Ket_StepRounds);
}
}
void Ket_UnwrapBlocks( void *state, const unsigned char *ciphertext, unsigned char *plaintext, unsigned int nBlocks )
{
unsigned char tempBlock[Ketje_BlockSize];
unsigned char frameAndPaddingBits[1];
frameAndPaddingBits[0] = 0x08 | FRAMEBITS11;
while ( nBlocks-- != 0 )
{
KeccakF_StateExtractLanes(state, tempBlock, Ketje_BlockSize / KeccakF_laneInBytes);
tempBlock[0] = *(plaintext++) = *(ciphertext++) ^ tempBlock[0];
tempBlock[1] = *(plaintext++) = *(ciphertext++) ^ tempBlock[1];
#if (KeccakF_width == 400 )
tempBlock[2] = *(plaintext++) = *(ciphertext++) ^ tempBlock[2];
tempBlock[3] = *(plaintext++) = *(ciphertext++) ^ tempBlock[3];
#endif
KeccakF_StateXORLanes(state, tempBlock, Ketje_BlockSize / KeccakF_laneInBytes);
KeccakF_StateXORBytesInLane(state, Ketje_BlockSize / KeccakF_laneInBytes, frameAndPaddingBits, 0, 1);
KeccakP_StatePermute(state, Ket_StepRounds);
}
}
