/***************************************************************************
* Additional implementation of "BIKE: Bit Flipping Key Encapsulation". 
* Copyright 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Written by Nir Drucker and Shay Gueron
* AWS Cryptographic Algorithms Group
* (ndrucker@amazon.com, gueron@amazon.com)
*
* The license is detailed in the file LICENSE.txt, and applies to this file.
* ***************************************************************************/

#pragma once

#include "defs.h"

////////////////////////////////////////////
//             BIKE Parameters
///////////////////////////////////////////
#define N0 2

// 64-bits of post-quantum security parameters (BIKE paper):
#define R_BITS  10163
#define DV      71
#define FAKE_DV 133
#define T1      134
#define U_ERR 0

//The gfm code is optimized to a block size in this case:
#define BLOCK_SIZE (16384)

#define MAX_DELTA 4

//Round the size to the nearest byte.
//SIZE suffix, is the number of bytes (uint8_t).
#define N_BITS   (R_BITS * N0)
#define R_SIZE   DIVIDE_AND_CEIL(R_BITS, 8)
#define R_QW     DIVIDE_AND_CEIL(R_BITS, 64)
#define N_SIZE   DIVIDE_AND_CEIL(N_BITS, 8)
#define N_QW     DIVIDE_AND_CEIL(N_BITS, 64)
#define N_EXTRA_BYTES (8 * N_QW - N_SIZE)

#define R_BLOCKS         DIVIDE_AND_CEIL(R_BITS, BLOCK_SIZE)
#define R_PADDED        (R_BLOCKS * BLOCK_SIZE)
#define R_PADDED_SIZE   (R_PADDED / 8)
#define R_PADDED_QW     (R_PADDED / 64)

#define N_BLOCKS         DIVIDE_AND_CEIL(N_BITS, BLOCK_SIZE)
#define N_PADDED        (N_BLOCKS * BLOCK_SIZE)
#define N_PADDED_SIZE   (N_PADDED / 8)
#define N_PADDED_QW     (N_PADDED / 64)

#define R_DQWORDS DIVIDE_AND_CEIL(R_SIZE, 16)

#define R_DDQWORDS_BITS (DIVIDE_AND_CEIL(R_BITS, ALL_YMM_SIZE) * ALL_YMM_SIZE)
bike_static_assert((R_BITS % ALL_YMM_SIZE != 0), rbits_512_err);

#define N_DDQWORDS_BITS (R_DDQWORDS_BITS + R_BITS)
bike_static_assert((N_BITS % ALL_YMM_SIZE != 0), nbits_512_err);

#define LAST_R_QW_LEAD  (R_BITS & MASK(6))
#define LAST_R_QW_TRAIL (64 - LAST_R_QW_LEAD)
#define LAST_R_QW_MASK  MASK(LAST_R_QW_LEAD)

#define LAST_R_BYTE_LEAD  (R_BITS & MASK(3))
#define LAST_R_BYTE_TRAIL (8 - LAST_R_BYTE_LEAD)
#define LAST_R_BYTE_MASK  MASK(LAST_R_BYTE_LEAD)

// BIKE auxiliary functions parameters:
#define ELL_K_BITS  256
#define ELL_K_SIZE (ELL_K_BITS / 8)

#define SHA_MB_SECURE_BUF_SIZE 608