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195 lines
7.1 KiB
195 lines
7.1 KiB
/*
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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 "core.h"
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#include "blake2/blamka-round-ref.h"
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#include "blake2/blake2-impl.h"
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#include "blake2/blake2.h"
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/*
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* Function fills a new memory block and optionally XORs the old block over the new one.
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* @next_block must be initialized.
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* @param prev_block Pointer to the previous block
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* @param ref_block Pointer to the reference block
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* @param next_block Pointer to the block to be constructed
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* @param with_xor Whether to XOR into the new block (1) or just overwrite (0)
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* @pre all block pointers must be valid
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*/
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static void fill_block(const block *prev_block, const block *ref_block,
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block *next_block, int with_xor) {
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block blockR, block_tmp;
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unsigned i;
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copy_block(&blockR, ref_block);
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xor_block(&blockR, prev_block);
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copy_block(&block_tmp, &blockR);
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/* Now blockR = ref_block + prev_block and block_tmp = ref_block + prev_block */
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if (with_xor) {
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/* Saving the next block contents for XOR over: */
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xor_block(&block_tmp, next_block);
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/* Now blockR = ref_block + prev_block and
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block_tmp = ref_block + prev_block + next_block */
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}
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/* Apply Blake2 on columns of 64-bit words: (0,1,...,15) , then
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(16,17,..31)... finally (112,113,...127) */
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for (i = 0; i < 8; ++i) {
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BLAKE2_ROUND_NOMSG(
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blockR.v[16 * i], blockR.v[16 * i + 1], blockR.v[16 * i + 2],
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blockR.v[16 * i + 3], blockR.v[16 * i + 4], blockR.v[16 * i + 5],
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blockR.v[16 * i + 6], blockR.v[16 * i + 7], blockR.v[16 * i + 8],
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blockR.v[16 * i + 9], blockR.v[16 * i + 10], blockR.v[16 * i + 11],
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blockR.v[16 * i + 12], blockR.v[16 * i + 13], blockR.v[16 * i + 14],
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blockR.v[16 * i + 15]);
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}
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/* Apply Blake2 on rows of 64-bit words: (0,1,16,17,...112,113), then
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(2,3,18,19,...,114,115).. finally (14,15,30,31,...,126,127) */
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for (i = 0; i < 8; i++) {
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BLAKE2_ROUND_NOMSG(
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blockR.v[2 * i], blockR.v[2 * i + 1], blockR.v[2 * i + 16],
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blockR.v[2 * i + 17], blockR.v[2 * i + 32], blockR.v[2 * i + 33],
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blockR.v[2 * i + 48], blockR.v[2 * i + 49], blockR.v[2 * i + 64],
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blockR.v[2 * i + 65], blockR.v[2 * i + 80], blockR.v[2 * i + 81],
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blockR.v[2 * i + 96], blockR.v[2 * i + 97], blockR.v[2 * i + 112],
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blockR.v[2 * i + 113]);
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}
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copy_block(next_block, &block_tmp);
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xor_block(next_block, &blockR);
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}
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static void next_addresses(block *address_block, block *input_block,
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const block *zero_block) {
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input_block->v[6]++;
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fill_block(zero_block, input_block, address_block, 0);
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fill_block(zero_block, address_block, address_block, 0);
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}
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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, zero_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;
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uint32_t i;
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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(&zero_block, 0);
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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, &zero_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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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, &zero_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(instance->memory + prev_offset, ref_block, curr_block, 0);
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} else {
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if(0 == position.pass) {
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fill_block(instance->memory + prev_offset, ref_block,
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curr_block, 0);
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} else {
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fill_block(instance->memory + prev_offset, ref_block,
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curr_block, 1);
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}
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}
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}
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}
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