/*
Implementation by Ronny Van Keer, hereby denoted as "the implementer".

For more information, feedback or questions, please refer to our website:
https://keccak.team/

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 "SP800-185.h"
#ifndef KeccakP1600timesN_excluded
    #include "KeccakP-1600-times2-SnP.h"
    #include "KeccakP-1600-times4-SnP.h"
    #include "KeccakP-1600-times8-SnP.h"
#endif

/* #define DEBUG_DUMP */

#if defined(DEBUG_DUMP)

#include <stdio.h>

static void DUMP( const unsigned char * pText, const unsigned char * pData, unsigned int size )
{
    unsigned int i;
    printf("%s (%u bytes):", pText, size);
    for(i=0; i<size; i++)
        printf(" %02x", (int)pData[i]);
    printf("\n");
}
#else
#define DUMP(pText, pData, size )
#endif

static unsigned int left_encode( unsigned char * encbuf, size_t value )
{
    unsigned int n, i;
    size_t v;

    for ( v = value, n = 0; v && (n < sizeof(size_t)); ++n, v >>= 8 )
        ; /* empty */
    if (n == 0)
        n = 1;
    for ( i = 1; i <= n; ++i )
    {
        encbuf[i] = (unsigned char)(value >> (8 * (n-i)));
    }
    encbuf[0] = (unsigned char)n;
    return n + 1;
}

static unsigned int right_encode( unsigned char * encbuf, size_t value )
{
    unsigned int n, i;
    size_t v;

    for ( v = value, n = 0; v && (n < sizeof(size_t)); ++n, v >>= 8 )
        ; /* empty */
    if (n == 0)
        n = 1;
    for ( i = 1; i <= n; ++i )
    {
        encbuf[i-1] = (unsigned char)(value >> (8 * (n-i)));
    }
    encbuf[n] = (unsigned char)n;
    return n + 1;
}

#define laneSize        8
#define suffix          0x1F

#define security        128
#include "SP800-185.inc"
#undef  security

#define security        256
#include "SP800-185.inc"
#undef  security