basic key encryption
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186
bundled/cbits/argon2/opt.c
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186
bundled/cbits/argon2/opt.c
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/*
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* Argon2 reference source code package - reference C implementations
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*
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* Copyright 2015
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* Daniel Dinu, Dmitry Khovratovich, Jean-Philippe Aumasson, and Samuel Neves
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*
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* You may use this work under the terms of a Creative Commons CC0 1.0
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* License/Waiver or the Apache Public License 2.0, at your option. The terms of
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* these licenses can be found at:
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*
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* - CC0 1.0 Universal : http://creativecommons.org/publicdomain/zero/1.0
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* - Apache 2.0 : http://www.apache.org/licenses/LICENSE-2.0
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*
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* You should have received a copy of both of these licenses along with this
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* software. If not, they may be obtained at the above URLs.
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*/
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#include <stdint.h>
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#include <string.h>
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#include <stdlib.h>
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#include "argon2.h"
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#include "opt.h"
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#include "blake2/blake2.h"
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#include "blake2/blamka-round-opt.h"
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static void fill_block(__m128i *state, const block *ref_block, block *next_block,
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int with_xor) {
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__m128i block_XY[ARGON2_OWORDS_IN_BLOCK];
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unsigned int i;
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if (with_xor) {
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for (i = 0; i < ARGON2_OWORDS_IN_BLOCK; i++) {
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state[i] = _mm_xor_si128(
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state[i], _mm_loadu_si128((const __m128i *)ref_block->v + i));
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block_XY[i] = _mm_xor_si128(
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state[i], _mm_loadu_si128((const __m128i *)next_block->v + i));
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}
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} else {
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for (i = 0; i < ARGON2_OWORDS_IN_BLOCK; i++) {
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block_XY[i] = state[i] = _mm_xor_si128(
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state[i], _mm_loadu_si128((const __m128i *)ref_block->v + i));
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}
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}
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for (i = 0; i < 8; ++i) {
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BLAKE2_ROUND(state[8 * i + 0], state[8 * i + 1], state[8 * i + 2],
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state[8 * i + 3], state[8 * i + 4], state[8 * i + 5],
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state[8 * i + 6], state[8 * i + 7]);
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}
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for (i = 0; i < 8; ++i) {
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BLAKE2_ROUND(state[8 * 0 + i], state[8 * 1 + i], state[8 * 2 + i],
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state[8 * 3 + i], state[8 * 4 + i], state[8 * 5 + i],
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state[8 * 6 + i], state[8 * 7 + i]);
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}
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for (i = 0; i < ARGON2_OWORDS_IN_BLOCK; i++) {
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state[i] = _mm_xor_si128(state[i], block_XY[i]);
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_mm_storeu_si128((__m128i *)next_block->v + i, state[i]);
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}
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}
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static void next_addresses(block *address_block, block *input_block) {
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/*Temporary zero-initialized blocks*/
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__m128i zero_block[ARGON2_OWORDS_IN_BLOCK];
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__m128i zero2_block[ARGON2_OWORDS_IN_BLOCK];
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memset(zero_block, 0, sizeof(zero_block));
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memset(zero2_block, 0, sizeof(zero2_block));
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/*Increasing index counter*/
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input_block->v[6]++;
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/*First iteration of G*/
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fill_block(zero_block, input_block, address_block, 0);
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/*Second iteration of G*/
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fill_block(zero2_block, address_block, address_block, 0);
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}
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static void fill_segment(const argon2_instance_t *instance,
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argon2_position_t position) {
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block *ref_block = NULL, *curr_block = NULL;
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block address_block, input_block;
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uint64_t pseudo_rand, ref_index, ref_lane;
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uint32_t prev_offset, curr_offset;
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uint32_t starting_index, i;
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__m128i state[64];
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int data_independent_addressing;
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if (instance == NULL) {
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return;
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}
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data_independent_addressing =
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(instance->type == Argon2_i) ||
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(instance->type == Argon2_id && (position.pass == 0) &&
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(position.slice < ARGON2_SYNC_POINTS / 2));
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if (data_independent_addressing) {
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init_block_value(&input_block, 0);
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input_block.v[0] = position.pass;
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input_block.v[1] = position.lane;
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input_block.v[2] = position.slice;
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input_block.v[3] = instance->memory_blocks;
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input_block.v[4] = instance->passes;
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input_block.v[5] = instance->type;
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}
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starting_index = 0;
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if ((0 == position.pass) && (0 == position.slice)) {
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starting_index = 2; /* we have already generated the first two blocks */
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/* Don't forget to generate the first block of addresses: */
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if (data_independent_addressing) {
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next_addresses(&address_block, &input_block);
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}
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}
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/* Offset of the current block */
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curr_offset = position.lane * instance->lane_length +
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position.slice * instance->segment_length + starting_index;
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if (0 == curr_offset % instance->lane_length) {
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/* Last block in this lane */
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prev_offset = curr_offset + instance->lane_length - 1;
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} else {
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/* Previous block */
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prev_offset = curr_offset - 1;
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}
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memcpy(state, ((instance->memory + prev_offset)->v), ARGON2_BLOCK_SIZE);
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for (i = starting_index; i < instance->segment_length;
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++i, ++curr_offset, ++prev_offset) {
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/*1.1 Rotating prev_offset if needed */
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if (curr_offset % instance->lane_length == 1) {
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prev_offset = curr_offset - 1;
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}
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/* 1.2 Computing the index of the reference block */
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/* 1.2.1 Taking pseudo-random value from the previous block */
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if (data_independent_addressing) {
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if (i % ARGON2_ADDRESSES_IN_BLOCK == 0) {
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next_addresses(&address_block, &input_block);
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}
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pseudo_rand = address_block.v[i % ARGON2_ADDRESSES_IN_BLOCK];
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} else {
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pseudo_rand = instance->memory[prev_offset].v[0];
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}
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/* 1.2.2 Computing the lane of the reference block */
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ref_lane = ((pseudo_rand >> 32)) % instance->lanes;
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if ((position.pass == 0) && (position.slice == 0)) {
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/* Can not reference other lanes yet */
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ref_lane = position.lane;
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}
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/* 1.2.3 Computing the number of possible reference block within the
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* lane.
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*/
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position.index = i;
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ref_index = index_alpha(instance, &position, pseudo_rand & 0xFFFFFFFF,
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ref_lane == position.lane);
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/* 2 Creating a new block */
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ref_block =
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instance->memory + instance->lane_length * ref_lane + ref_index;
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curr_block = instance->memory + curr_offset;
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if (ARGON2_VERSION_10 == instance->version) {
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/* version 1.2.1 and earlier: overwrite, not XOR */
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fill_block(state, ref_block, curr_block, 0);
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} else {
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if(0 == position.pass) {
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fill_block(state, ref_block, curr_block, 0);
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} else {
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fill_block(state, ref_block, curr_block, 1);
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}
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}
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}
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}
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