/*
 * Argon2 reference source code package - reference C implementations
 *
 * Copyright 2015
 * Daniel Dinu, Dmitry Khovratovich, Jean-Philippe Aumasson, and Samuel Neves
 *
 * You may use this work under the terms of a Creative Commons CC0 1.0 
 * License/Waiver or the Apache Public License 2.0, at your option. The terms of
 * these licenses can be found at:
 *
 * - CC0 1.0 Universal : http://creativecommons.org/publicdomain/zero/1.0
 * - Apache 2.0        : http://www.apache.org/licenses/LICENSE-2.0
 *
 * You should have received a copy of both of these licenses along with this
 * software. If not, they may be obtained at the above URLs.
 */

#include <stdint.h>
#include <string.h>
#include <stdlib.h>

#include "argon2.h"
#include "opt.h"

#include "blake2/blake2.h"
#include "blake2/blamka-round-opt.h"

void fill_block(__m128i *state, const uint8_t *ref_block, uint8_t *next_block) {
    __m128i block_XY[ARGON2_OWORDS_IN_BLOCK];
    uint32_t i;

    for (i = 0; i < ARGON2_OWORDS_IN_BLOCK; i++) {
        block_XY[i] = state[i] = _mm_xor_si128(
            state[i], _mm_loadu_si128((__m128i const *)(&ref_block[16 * i])));
    }

    for (i = 0; i < 8; ++i) {
        BLAKE2_ROUND(state[8 * i + 0], state[8 * i + 1], state[8 * i + 2],
            state[8 * i + 3], state[8 * i + 4], state[8 * i + 5],
            state[8 * i + 6], state[8 * i + 7]);
    }

    for (i = 0; i < 8; ++i) {
        BLAKE2_ROUND(state[8 * 0 + i], state[8 * 1 + i], state[8 * 2 + i],
            state[8 * 3 + i], state[8 * 4 + i], state[8 * 5 + i],
            state[8 * 6 + i], state[8 * 7 + i]);
    }

    for (i = 0; i < ARGON2_OWORDS_IN_BLOCK; i++) {
        state[i] = _mm_xor_si128(state[i], block_XY[i]);
        _mm_storeu_si128((__m128i *)(&next_block[16 * i]), state[i]);
    }
}

void fill_block_with_xor(__m128i *state, const uint8_t *ref_block,
                         uint8_t *next_block) {
    __m128i block_XY[ARGON2_OWORDS_IN_BLOCK];
    uint32_t i;

    for (i = 0; i < ARGON2_OWORDS_IN_BLOCK; i++) { 
       state[i] = _mm_xor_si128(
            state[i], _mm_loadu_si128((__m128i const *)(&ref_block[16 * i])));
        block_XY[i] =  _mm_xor_si128(
            state[i], _mm_loadu_si128((__m128i const *)(&next_block[16 * i])));
    }

    for (i = 0; i < 8; ++i) {
        BLAKE2_ROUND(state[8 * i + 0], state[8 * i + 1], state[8 * i + 2],
                     state[8 * i + 3], state[8 * i + 4], state[8 * i + 5],
                     state[8 * i + 6], state[8 * i + 7]);
    }

    for (i = 0; i < 8; ++i) {
        BLAKE2_ROUND(state[8 * 0 + i], state[8 * 1 + i], state[8 * 2 + i],
                     state[8 * 3 + i], state[8 * 4 + i], state[8 * 5 + i],
                     state[8 * 6 + i], state[8 * 7 + i]);
    }

    for (i = 0; i < ARGON2_OWORDS_IN_BLOCK; i++) {
        state[i] = _mm_xor_si128(state[i], block_XY[i]);
        _mm_storeu_si128((__m128i *)(&next_block[16 * i]), state[i]);
    }
}

void generate_addresses(const argon2_instance_t *instance,
                        const argon2_position_t *position,
                        uint64_t *pseudo_rands) {
    block address_block, input_block, tmp_block;
    uint32_t i;

    init_block_value(&address_block, 0);
    init_block_value(&input_block, 0);

    if (instance != NULL && position != NULL) {
        input_block.v[0] = position->pass;
        input_block.v[1] = position->lane;
        input_block.v[2] = position->slice;
        input_block.v[3] = instance->memory_blocks;
        input_block.v[4] = instance->passes;
        input_block.v[5] = instance->type;

        for (i = 0; i < instance->segment_length; ++i) {
            if (i % ARGON2_ADDRESSES_IN_BLOCK == 0) {
                /*Temporary zero-initialized blocks*/
                __m128i zero_block[ARGON2_OWORDS_IN_BLOCK];
                __m128i zero2_block[ARGON2_OWORDS_IN_BLOCK];
                memset(zero_block, 0, sizeof(zero_block));
                memset(zero2_block, 0, sizeof(zero2_block));
                init_block_value(&address_block, 0);
                init_block_value(&tmp_block, 0);
                /*Increasing index counter*/
                input_block.v[6]++;
                /*First iteration of G*/
                fill_block_with_xor(zero_block, (uint8_t *)&input_block.v,
                           (uint8_t *)&tmp_block.v);
                /*Second iteration of G*/
                fill_block_with_xor(zero2_block, (uint8_t *)&tmp_block.v,
                           (uint8_t *)&address_block.v);
            }

            pseudo_rands[i] = address_block.v[i % ARGON2_ADDRESSES_IN_BLOCK];
        }
    }
}

void fill_segment(const argon2_instance_t *instance,
                  argon2_position_t position) {
    block *ref_block = NULL, *curr_block = NULL;
    uint64_t pseudo_rand, ref_index, ref_lane;
    uint32_t prev_offset, curr_offset;
    uint32_t starting_index, i;
    __m128i state[64];
    int data_independent_addressing;

    /* Pseudo-random values that determine the reference block position */
    uint64_t *pseudo_rands = NULL;

    if (instance == NULL) {
        return;
    }

    data_independent_addressing =
        (instance->type == Argon2_i) ||
        (instance->type == Argon2_id && (position.pass == 0) &&
         (position.slice < ARGON2_SYNC_POINTS / 2));

    pseudo_rands =
        (uint64_t *)malloc(sizeof(uint64_t) * instance->segment_length);
    if (pseudo_rands == NULL) {
        return;
    }

    if (data_independent_addressing) {
        generate_addresses(instance, &position, pseudo_rands);
    }

    starting_index = 0;

    if ((0 == position.pass) && (0 == position.slice)) {
        starting_index = 2; /* we have already generated the first two blocks */
    }

    /* Offset of the current block */
    curr_offset = position.lane * instance->lane_length +
                  position.slice * instance->segment_length + starting_index;

    if (0 == curr_offset % instance->lane_length) {
        /* Last block in this lane */
        prev_offset = curr_offset + instance->lane_length - 1;
    } else {
        /* Previous block */
        prev_offset = curr_offset - 1;
    }

    memcpy(state, ((instance->memory + prev_offset)->v), ARGON2_BLOCK_SIZE);

    for (i = starting_index; i < instance->segment_length;
         ++i, ++curr_offset, ++prev_offset) {
        /*1.1 Rotating prev_offset if needed */
        if (curr_offset % instance->lane_length == 1) {
            prev_offset = curr_offset - 1;
        }

        /* 1.2 Computing the index of the reference block */
        /* 1.2.1 Taking pseudo-random value from the previous block */
        if (data_independent_addressing) {
            pseudo_rand = pseudo_rands[i];
        } else {
            pseudo_rand = instance->memory[prev_offset].v[0];
        }

        /* 1.2.2 Computing the lane of the reference block */
        ref_lane = ((pseudo_rand >> 32)) % instance->lanes;

        if ((position.pass == 0) && (position.slice == 0)) {
            /* Can not reference other lanes yet */
            ref_lane = position.lane;
        }

        /* 1.2.3 Computing the number of possible reference block within the
         * lane.
         */
        position.index = i;
        ref_index = index_alpha(instance, &position, pseudo_rand & 0xFFFFFFFF,
                                ref_lane == position.lane);

        /* 2 Creating a new block */
        ref_block =
            instance->memory + instance->lane_length * ref_lane + ref_index;
        curr_block = instance->memory + curr_offset;
        if (ARGON2_VERSION_10 == instance->version) {
            /* version 1.2.1 and earlier: overwrite, not XOR */
            fill_block(state, (uint8_t *)ref_block->v,
                       (uint8_t *)curr_block->v);
        } else {
            if(0 == position.pass) {
                fill_block(state, (uint8_t *)ref_block->v,
                           (uint8_t *)curr_block->v);
            } else {
                fill_block_with_xor(state, (uint8_t *)ref_block->v,
                                    (uint8_t *)curr_block->v);
            }
        }
    }

    free(pseudo_rands);
}