/*
Implementation by the Keccak, Keyak and Ketje Teams, namely, Guido Bertoni,
Joan Daemen, Michaël Peeters, Gilles Van Assche and Ronny Van Keer, hereby
denoted as "the implementer".

For more information, feedback or questions, please refer to our websites:
http://keccak.noekeon.org/
http://keyak.noekeon.org/
http://ketje.noekeon.org/

To the extent possible under law, the implementer has waived all copyright
and related or neighboring rights to the source code in this file.
http://creativecommons.org/publicdomain/zero/1.0/
*/

#include <string.h>
#include <stdlib.h>
/* #include "brg_endian.h" */
#include "KeccakP-1600-opt64-config.h"

#if NOT_PYTHON
typedef unsigned char UINT8;
/* typedef unsigned long long int UINT64; */
#endif

#if defined(KeccakP1600_useLaneComplementing)
#define UseBebigokimisa
#endif

#if defined(_MSC_VER)
#define ROL64(a, offset) _rotl64(a, offset)
#elif defined(KeccakP1600_useSHLD)
    #define ROL64(x,N) ({ \
    register UINT64 __out; \
    register UINT64 __in = x; \
    __asm__ ("shld %2,%0,%0" : "=r"(__out) : "0"(__in), "i"(N)); \
    __out; \
    })
#else
#define ROL64(a, offset) ((((UINT64)a) << offset) ^ (((UINT64)a) >> (64-offset)))
#endif

#include "KeccakP-1600-64.macros"
#ifdef KeccakP1600_fullUnrolling
#define FullUnrolling
#else
#define Unrolling KeccakP1600_unrolling
#endif
#include "KeccakP-1600-unrolling.macros"
#include "SnP-Relaned.h"

static const UINT64 KeccakF1600RoundConstants[24] = {
    0x0000000000000001ULL,
    0x0000000000008082ULL,
    0x800000000000808aULL,
    0x8000000080008000ULL,
    0x000000000000808bULL,
    0x0000000080000001ULL,
    0x8000000080008081ULL,
    0x8000000000008009ULL,
    0x000000000000008aULL,
    0x0000000000000088ULL,
    0x0000000080008009ULL,
    0x000000008000000aULL,
    0x000000008000808bULL,
    0x800000000000008bULL,
    0x8000000000008089ULL,
    0x8000000000008003ULL,
    0x8000000000008002ULL,
    0x8000000000000080ULL,
    0x000000000000800aULL,
    0x800000008000000aULL,
    0x8000000080008081ULL,
    0x8000000000008080ULL,
    0x0000000080000001ULL,
    0x8000000080008008ULL };

/* ---------------------------------------------------------------- */

void KeccakP1600_Initialize(void *state)
{
    memset(state, 0, 200);
#ifdef KeccakP1600_useLaneComplementing
    ((UINT64*)state)[ 1] = ~(UINT64)0;
    ((UINT64*)state)[ 2] = ~(UINT64)0;
    ((UINT64*)state)[ 8] = ~(UINT64)0;
    ((UINT64*)state)[12] = ~(UINT64)0;
    ((UINT64*)state)[17] = ~(UINT64)0;
    ((UINT64*)state)[20] = ~(UINT64)0;
#endif
}

/* ---------------------------------------------------------------- */

void KeccakP1600_AddBytesInLane(void *state, unsigned int lanePosition, const unsigned char *data, unsigned int offset, unsigned int length)
{
#if (PLATFORM_BYTE_ORDER == IS_LITTLE_ENDIAN)
    UINT64 lane;
    if (length == 0)
        return;
    if (length == 1)
        lane = data[0];
    else {
        lane = 0;
        memcpy(&lane, data, length);
    }
    lane <<= offset*8;
#else
    UINT64 lane = 0;
    unsigned int i;
    for(i=0; i<length; i++)
        lane |= ((UINT64)data[i]) << ((i+offset)*8);
#endif
    ((UINT64*)state)[lanePosition] ^= lane;
}

/* ---------------------------------------------------------------- */

void KeccakP1600_AddLanes(void *state, const unsigned char *data, unsigned int laneCount)
{
#if (PLATFORM_BYTE_ORDER == IS_LITTLE_ENDIAN)
    unsigned int i = 0;
#ifdef NO_MISALIGNED_ACCESSES
    /* If either pointer is misaligned, fall back to byte-wise xor. */

    if (((((uintptr_t)state) & 7) != 0) || ((((uintptr_t)data) & 7) != 0)) {
      for (i = 0; i < laneCount * 8; i++) {
        ((unsigned char*)state)[i] ^= data[i];
      }
    }
    else
#endif
    {
      /* Otherwise... */

      for( ; (i+8)<=laneCount; i+=8) {
          ((UINT64*)state)[i+0] ^= ((UINT64*)data)[i+0];
          ((UINT64*)state)[i+1] ^= ((UINT64*)data)[i+1];
          ((UINT64*)state)[i+2] ^= ((UINT64*)data)[i+2];
          ((UINT64*)state)[i+3] ^= ((UINT64*)data)[i+3];
          ((UINT64*)state)[i+4] ^= ((UINT64*)data)[i+4];
          ((UINT64*)state)[i+5] ^= ((UINT64*)data)[i+5];
          ((UINT64*)state)[i+6] ^= ((UINT64*)data)[i+6];
          ((UINT64*)state)[i+7] ^= ((UINT64*)data)[i+7];
      }
      for( ; (i+4)<=laneCount; i+=4) {
          ((UINT64*)state)[i+0] ^= ((UINT64*)data)[i+0];
          ((UINT64*)state)[i+1] ^= ((UINT64*)data)[i+1];
          ((UINT64*)state)[i+2] ^= ((UINT64*)data)[i+2];
          ((UINT64*)state)[i+3] ^= ((UINT64*)data)[i+3];
      }
      for( ; (i+2)<=laneCount; i+=2) {
          ((UINT64*)state)[i+0] ^= ((UINT64*)data)[i+0];
          ((UINT64*)state)[i+1] ^= ((UINT64*)data)[i+1];
      }
      if (i<laneCount) {
          ((UINT64*)state)[i+0] ^= ((UINT64*)data)[i+0];
      }
    }
#else
    unsigned int i;
    UINT8 *curData = data;
    for(i=0; i<laneCount; i++, curData+=8) {
        UINT64 lane = (UINT64)curData[0]
            | ((UINT64)curData[1] << 8)
            | ((UINT64)curData[2] << 16)
            | ((UINT64)curData[3] << 24)
            | ((UINT64)curData[4] <<32)
            | ((UINT64)curData[5] << 40)
            | ((UINT64)curData[6] << 48)
            | ((UINT64)curData[7] << 56);
        ((UINT64*)state)[i] ^= lane;
    }
#endif
}

/* ---------------------------------------------------------------- */

#if (PLATFORM_BYTE_ORDER != IS_LITTLE_ENDIAN)
void KeccakP1600_AddByte(void *state, unsigned char byte, unsigned int offset)
{
    UINT64 lane = byte;
    lane <<= (offset%8)*8;
    ((UINT64*)state)[offset/8] ^= lane;
}
#endif

/* ---------------------------------------------------------------- */

void KeccakP1600_AddBytes(void *state, const unsigned char *data, unsigned int offset, unsigned int length)
{
    SnP_AddBytes(state, data, offset, length, KeccakP1600_AddLanes, KeccakP1600_AddBytesInLane, 8);
}

/* ---------------------------------------------------------------- */

void KeccakP1600_OverwriteBytesInLane(void *state, unsigned int lanePosition, const unsigned char *data, unsigned int offset, unsigned int length)
{
#if (PLATFORM_BYTE_ORDER == IS_LITTLE_ENDIAN)
#ifdef KeccakP1600_useLaneComplementing
    if ((lanePosition == 1) || (lanePosition == 2) || (lanePosition == 8) || (lanePosition == 12) || (lanePosition == 17) || (lanePosition == 20)) {
        unsigned int i;
        for(i=0; i<length; i++)
            ((unsigned char*)state)[lanePosition*8+offset+i] = ~data[i];
    }
    else
#endif
    {
        memcpy((unsigned char*)state+lanePosition*8+offset, data, length);
    }
#else
#error "Not yet implemented"
#endif
}

/* ---------------------------------------------------------------- */

void KeccakP1600_OverwriteLanes(void *state, const unsigned char *data, unsigned int laneCount)
{
#if (PLATFORM_BYTE_ORDER == IS_LITTLE_ENDIAN)
#ifdef KeccakP1600_useLaneComplementing
    unsigned int lanePosition;

    for(lanePosition=0; lanePosition<laneCount; lanePosition++)
        if ((lanePosition == 1) || (lanePosition == 2) || (lanePosition == 8) || (lanePosition == 12) || (lanePosition == 17) || (lanePosition == 20))
            ((UINT64*)state)[lanePosition] = ~((const UINT64*)data)[lanePosition];
        else
            ((UINT64*)state)[lanePosition] = ((const UINT64*)data)[lanePosition];
#else
    memcpy(state, data, laneCount*8);
#endif
#else
#error "Not yet implemented"
#endif
}

/* ---------------------------------------------------------------- */

void KeccakP1600_OverwriteBytes(void *state, const unsigned char *data, unsigned int offset, unsigned int length)
{
    SnP_OverwriteBytes(state, data, offset, length, KeccakP1600_OverwriteLanes, KeccakP1600_OverwriteBytesInLane, 8);
}

/* ---------------------------------------------------------------- */

void KeccakP1600_OverwriteWithZeroes(void *state, unsigned int byteCount)
{
#if (PLATFORM_BYTE_ORDER == IS_LITTLE_ENDIAN)
#ifdef KeccakP1600_useLaneComplementing
    unsigned int lanePosition;

    for(lanePosition=0; lanePosition<byteCount/8; lanePosition++)
        if ((lanePosition == 1) || (lanePosition == 2) || (lanePosition == 8) || (lanePosition == 12) || (lanePosition == 17) || (lanePosition == 20))
            ((UINT64*)state)[lanePosition] = ~0;
        else
            ((UINT64*)state)[lanePosition] = 0;
    if (byteCount%8 != 0) {
        lanePosition = byteCount/8;
        if ((lanePosition == 1) || (lanePosition == 2) || (lanePosition == 8) || (lanePosition == 12) || (lanePosition == 17) || (lanePosition == 20))
            memset((unsigned char*)state+lanePosition*8, 0xFF, byteCount%8);
        else
            memset((unsigned char*)state+lanePosition*8, 0, byteCount%8);
    }
#else
    memset(state, 0, byteCount);
#endif
#else
#error "Not yet implemented"
#endif
}

/* ---------------------------------------------------------------- */

void KeccakP1600_Permute_24rounds(void *state)
{
    declareABCDE
    #ifndef KeccakP1600_fullUnrolling
    unsigned int i;
    #endif
    UINT64 *stateAsLanes = (UINT64*)state;

    copyFromState(A, stateAsLanes)
    rounds24
    copyToState(stateAsLanes, A)
}

/* ---------------------------------------------------------------- */

void KeccakP1600_Permute_12rounds(void *state)
{
    declareABCDE
    #ifndef KeccakP1600_fullUnrolling
    unsigned int i;
    #endif
    UINT64 *stateAsLanes = (UINT64*)state;

    copyFromState(A, stateAsLanes)
    rounds12
    copyToState(stateAsLanes, A)
}

/* ---------------------------------------------------------------- */

void KeccakP1600_ExtractBytesInLane(const void *state, unsigned int lanePosition, unsigned char *data, unsigned int offset, unsigned int length)
{
    UINT64 lane = ((UINT64*)state)[lanePosition];
#ifdef KeccakP1600_useLaneComplementing
    if ((lanePosition == 1) || (lanePosition == 2) || (lanePosition == 8) || (lanePosition == 12) || (lanePosition == 17) || (lanePosition == 20))
        lane = ~lane;
#endif
#if (PLATFORM_BYTE_ORDER == IS_LITTLE_ENDIAN)
    {
        UINT64 lane1[1];
        lane1[0] = lane;
        memcpy(data, (UINT8*)lane1+offset, length);
    }
#else
    unsigned int i;
    lane >>= offset*8;
    for(i=0; i<length; i++) {
        data[i] = lane & 0xFF;
        lane >>= 8;
    }
#endif
}

/* ---------------------------------------------------------------- */

#if (PLATFORM_BYTE_ORDER != IS_LITTLE_ENDIAN)
void fromWordToBytes(UINT8 *bytes, const UINT64 word)
{
    unsigned int i;

    for(i=0; i<(64/8); i++)
        bytes[i] = (word >> (8*i)) & 0xFF;
}
#endif

void KeccakP1600_ExtractLanes(const void *state, unsigned char *data, unsigned int laneCount)
{
#if (PLATFORM_BYTE_ORDER == IS_LITTLE_ENDIAN)
    memcpy(data, state, laneCount*8);
#else
    unsigned int i;

    for(i=0; i<laneCount; i++)
        fromWordToBytes(data+(i*8), ((const UINT64*)state)[i]);
#endif
#ifdef KeccakP1600_useLaneComplementing
    if (laneCount > 1) {
        ((UINT64*)data)[ 1] = ~((UINT64*)data)[ 1];
        if (laneCount > 2) {
            ((UINT64*)data)[ 2] = ~((UINT64*)data)[ 2];
            if (laneCount > 8) {
                ((UINT64*)data)[ 8] = ~((UINT64*)data)[ 8];
                if (laneCount > 12) {
                    ((UINT64*)data)[12] = ~((UINT64*)data)[12];
                    if (laneCount > 17) {
                        ((UINT64*)data)[17] = ~((UINT64*)data)[17];
                        if (laneCount > 20) {
                            ((UINT64*)data)[20] = ~((UINT64*)data)[20];
                        }
                    }
                }
            }
        }
    }
#endif
}

/* ---------------------------------------------------------------- */

void KeccakP1600_ExtractBytes(const void *state, unsigned char *data, unsigned int offset, unsigned int length)
{
    SnP_ExtractBytes(state, data, offset, length, KeccakP1600_ExtractLanes, KeccakP1600_ExtractBytesInLane, 8);
}

/* ---------------------------------------------------------------- */

void KeccakP1600_ExtractAndAddBytesInLane(const void *state, unsigned int lanePosition, const unsigned char *input, unsigned char *output, unsigned int offset, unsigned int length)
{
    UINT64 lane = ((UINT64*)state)[lanePosition];
#ifdef KeccakP1600_useLaneComplementing
    if ((lanePosition == 1) || (lanePosition == 2) || (lanePosition == 8) || (lanePosition == 12) || (lanePosition == 17) || (lanePosition == 20))
        lane = ~lane;
#endif
#if (PLATFORM_BYTE_ORDER == IS_LITTLE_ENDIAN)
    {
        unsigned int i;
        UINT64 lane1[1];
        lane1[0] = lane;
        for(i=0; i<length; i++)
            output[i] = input[i] ^ ((UINT8*)lane1)[offset+i];
    }
#else
    unsigned int i;
    lane >>= offset*8;
    for(i=0; i<length; i++) {
        output[i] = input[i] ^ (lane & 0xFF);
        lane >>= 8;
    }
#endif
}

/* ---------------------------------------------------------------- */

void KeccakP1600_ExtractAndAddLanes(const void *state, const unsigned char *input, unsigned char *output, unsigned int laneCount)
{
    unsigned int i;
#if (PLATFORM_BYTE_ORDER != IS_LITTLE_ENDIAN)
    unsigned char temp[8];
    unsigned int j;
#endif

    for(i=0; i<laneCount; i++) {
#if (PLATFORM_BYTE_ORDER == IS_LITTLE_ENDIAN)
        ((UINT64*)output)[i] = ((UINT64*)input)[i] ^ ((const UINT64*)state)[i];
#else
        fromWordToBytes(temp, ((const UINT64*)state)[i]);
        for(j=0; j<8; j++)
            output[i*8+j] = input[i*8+j] ^ temp[j];
#endif
    }
#ifdef KeccakP1600_useLaneComplementing
    if (laneCount > 1) {
        ((UINT64*)output)[ 1] = ~((UINT64*)output)[ 1];
        if (laneCount > 2) {
            ((UINT64*)output)[ 2] = ~((UINT64*)output)[ 2];
            if (laneCount > 8) {
                ((UINT64*)output)[ 8] = ~((UINT64*)output)[ 8];
                if (laneCount > 12) {
                    ((UINT64*)output)[12] = ~((UINT64*)output)[12];
                    if (laneCount > 17) {
                        ((UINT64*)output)[17] = ~((UINT64*)output)[17];
                        if (laneCount > 20) {
                            ((UINT64*)output)[20] = ~((UINT64*)output)[20];
                        }
                    }
                }
            }
        }
    }
#endif
}

/* ---------------------------------------------------------------- */

void KeccakP1600_ExtractAndAddBytes(const void *state, const unsigned char *input, unsigned char *output, unsigned int offset, unsigned int length)
{
    SnP_ExtractAndAddBytes(state, input, output, offset, length, KeccakP1600_ExtractAndAddLanes, KeccakP1600_ExtractAndAddBytesInLane, 8);
}

/* ---------------------------------------------------------------- */

size_t KeccakF1600_FastLoop_Absorb(void *state, unsigned int laneCount, const unsigned char *data, size_t dataByteLen)
{
    size_t originalDataByteLen = dataByteLen;
    declareABCDE
    #ifndef KeccakP1600_fullUnrolling
    unsigned int i;
    #endif
    UINT64 *stateAsLanes = (UINT64*)state;
    UINT64 *inDataAsLanes = (UINT64*)data;

    copyFromState(A, stateAsLanes)
    while(dataByteLen >= laneCount*8) {
        addInput(A, inDataAsLanes, laneCount)
        rounds24
        inDataAsLanes += laneCount;
        dataByteLen -= laneCount*8;
    }
    copyToState(stateAsLanes, A)
    return originalDataByteLen - dataByteLen;
}