keccak_perm_round.h

Go to the documentation of this file.

/*
* (C) 2010,2016,2021 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
 
#ifndef BOTAN_KECCAK_PERM_ROUND_H_
#define BOTAN_KECCAK_PERM_ROUND_H_
 
#include <botan/types.h>
#include <botan/internal/rotate.h>
 
namespace Botan {
 
inline void Keccak_Permutation_round(uint64_t T[25], const uint64_t A[25], uint64_t RC) {
   const uint64_t C0 = A[0] ^ A[5] ^ A[10] ^ A[15] ^ A[20];
   const uint64_t C1 = A[1] ^ A[6] ^ A[11] ^ A[16] ^ A[21];
   const uint64_t C2 = A[2] ^ A[7] ^ A[12] ^ A[17] ^ A[22];
   const uint64_t C3 = A[3] ^ A[8] ^ A[13] ^ A[18] ^ A[23];
   const uint64_t C4 = A[4] ^ A[9] ^ A[14] ^ A[19] ^ A[24];
 
   const uint64_t D0 = rotl<1>(C0) ^ C3;
   const uint64_t D1 = rotl<1>(C1) ^ C4;
   const uint64_t D2 = rotl<1>(C2) ^ C0;
   const uint64_t D3 = rotl<1>(C3) ^ C1;
   const uint64_t D4 = rotl<1>(C4) ^ C2;
 
   const uint64_t B00 = A[0] ^ D1;
   const uint64_t B01 = rotl<44>(A[6] ^ D2);
   const uint64_t B02 = rotl<43>(A[12] ^ D3);
   const uint64_t B03 = rotl<21>(A[18] ^ D4);
   const uint64_t B04 = rotl<14>(A[24] ^ D0);
   T[0] = B00 ^ (~B01 & B02) ^ RC;
   T[1] = B01 ^ (~B02 & B03);
   T[2] = B02 ^ (~B03 & B04);
   T[3] = B03 ^ (~B04 & B00);
   T[4] = B04 ^ (~B00 & B01);
 
   const uint64_t B05 = rotl<28>(A[3] ^ D4);
   const uint64_t B06 = rotl<20>(A[9] ^ D0);
   const uint64_t B07 = rotl<3>(A[10] ^ D1);
   const uint64_t B08 = rotl<45>(A[16] ^ D2);
   const uint64_t B09 = rotl<61>(A[22] ^ D3);
   T[5] = B05 ^ (~B06 & B07);
   T[6] = B06 ^ (~B07 & B08);
   T[7] = B07 ^ (~B08 & B09);
   T[8] = B08 ^ (~B09 & B05);
   T[9] = B09 ^ (~B05 & B06);
 
   const uint64_t B10 = rotl<1>(A[1] ^ D2);
   const uint64_t B11 = rotl<6>(A[7] ^ D3);
   const uint64_t B12 = rotl<25>(A[13] ^ D4);
   const uint64_t B13 = rotl<8>(A[19] ^ D0);
   const uint64_t B14 = rotl<18>(A[20] ^ D1);
   T[10] = B10 ^ (~B11 & B12);
   T[11] = B11 ^ (~B12 & B13);
   T[12] = B12 ^ (~B13 & B14);
   T[13] = B13 ^ (~B14 & B10);
   T[14] = B14 ^ (~B10 & B11);
 
   const uint64_t B15 = rotl<27>(A[4] ^ D0);
   const uint64_t B16 = rotl<36>(A[5] ^ D1);
   const uint64_t B17 = rotl<10>(A[11] ^ D2);
   const uint64_t B18 = rotl<15>(A[17] ^ D3);
   const uint64_t B19 = rotl<56>(A[23] ^ D4);
   T[15] = B15 ^ (~B16 & B17);
   T[16] = B16 ^ (~B17 & B18);
   T[17] = B17 ^ (~B18 & B19);
   T[18] = B18 ^ (~B19 & B15);
   T[19] = B19 ^ (~B15 & B16);
 
   const uint64_t B20 = rotl<62>(A[2] ^ D3);
   const uint64_t B21 = rotl<55>(A[8] ^ D4);
   const uint64_t B22 = rotl<39>(A[14] ^ D0);
   const uint64_t B23 = rotl<41>(A[15] ^ D1);
   const uint64_t B24 = rotl<2>(A[21] ^ D2);
   T[20] = B20 ^ (~B21 & B22);
   T[21] = B21 ^ (~B22 & B23);
   T[22] = B22 ^ (~B23 & B24);
   T[23] = B23 ^ (~B24 & B20);
   T[24] = B24 ^ (~B20 & B21);
}
 
}  // namespace Botan
 
#endif