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#include <string.h>
#include "argon2-core.h"
#define MASK_32 UINT64_C(0xFFFFFFFF)
#define F(x, y) ((x) + (y) + 2 * ((x) & MASK_32) * ((y) & MASK_32))
#define G(a, b, c, d) \
do { \
a = F(a, b); \
d = rotr64(d ^ a, 32); \
c = F(c, d); \
b = rotr64(b ^ c, 24); \
a = F(a, b); \
d = rotr64(d ^ a, 16); \
c = F(c, d); \
b = rotr64(b ^ c, 63); \
} while ((void)0, 0)
#define BLAKE2_ROUND_NOMSG(v0, v1, v2, v3, v4, v5, v6, v7, \
v8, v9, v10, v11, v12, v13, v14, v15) \
do { \
G(v0, v4, v8, v12); \
G(v1, v5, v9, v13); \
G(v2, v6, v10, v14); \
G(v3, v7, v11, v15); \
G(v0, v5, v10, v15); \
G(v1, v6, v11, v12); \
G(v2, v7, v8, v13); \
G(v3, v4, v9, v14); \
} while ((void)0, 0)
#define BLAKE2_ROUND_NOMSG1(v) \
BLAKE2_ROUND_NOMSG( \
(v)[ 0], (v)[ 1], (v)[ 2], (v)[ 3], \
(v)[ 4], (v)[ 5], (v)[ 6], (v)[ 7], \
(v)[ 8], (v)[ 9], (v)[10], (v)[11], \
(v)[12], (v)[13], (v)[14], (v)[15])
#define BLAKE2_ROUND_NOMSG2(v) \
BLAKE2_ROUND_NOMSG( \
(v)[ 0], (v)[ 1], (v)[ 16], (v)[ 17], \
(v)[ 32], (v)[ 33], (v)[ 48], (v)[ 49], \
(v)[ 64], (v)[ 65], (v)[ 80], (v)[ 81], \
(v)[ 96], (v)[ 97], (v)[112], (v)[113])
static void fill_block(const block *prev_block, const block *ref_block,
block *next_block, int with_xor)
{
block blockR, block_tmp;
copy_block(&blockR, ref_block);
xor_block(&blockR, prev_block);
copy_block(&block_tmp, &blockR);
if (with_xor) {
xor_block(&block_tmp, next_block);
}
/* Apply Blake2 on columns of 64-bit words: (0,1,...,15) , then
(16,17,..31)... finally (112,113,...127) */
BLAKE2_ROUND_NOMSG1(blockR.v + 0 * 16);
BLAKE2_ROUND_NOMSG1(blockR.v + 1 * 16);
BLAKE2_ROUND_NOMSG1(blockR.v + 2 * 16);
BLAKE2_ROUND_NOMSG1(blockR.v + 3 * 16);
BLAKE2_ROUND_NOMSG1(blockR.v + 4 * 16);
BLAKE2_ROUND_NOMSG1(blockR.v + 5 * 16);
BLAKE2_ROUND_NOMSG1(blockR.v + 6 * 16);
BLAKE2_ROUND_NOMSG1(blockR.v + 7 * 16);
/* Apply Blake2 on rows of 64-bit words: (0,1,16,17,...112,113), then
(2,3,18,19,...,114,115).. finally (14,15,30,31,...,126,127) */
BLAKE2_ROUND_NOMSG2(blockR.v + 0 * 2);
BLAKE2_ROUND_NOMSG2(blockR.v + 1 * 2);
BLAKE2_ROUND_NOMSG2(blockR.v + 2 * 2);
BLAKE2_ROUND_NOMSG2(blockR.v + 3 * 2);
BLAKE2_ROUND_NOMSG2(blockR.v + 4 * 2);
BLAKE2_ROUND_NOMSG2(blockR.v + 5 * 2);
BLAKE2_ROUND_NOMSG2(blockR.v + 6 * 2);
BLAKE2_ROUND_NOMSG2(blockR.v + 7 * 2);
copy_block(next_block, &block_tmp);
xor_block(next_block, &blockR);
}
static void next_addresses(block *address_block, block *input_block,
const block *zero_block)
{
input_block->v[6]++;
fill_block(zero_block, input_block, address_block, 0);
fill_block(zero_block, address_block, address_block, 0);
}
static void fill_segment_64(const argon2_instance_t *instance,
argon2_position_t position)
{
block *ref_block, *curr_block, *prev_block;
block address_block, input_block, zero_block;
uint64_t pseudo_rand, ref_index, ref_lane;
uint32_t prev_offset, curr_offset;
uint32_t starting_index, i;
int data_independent_addressing;
if (instance == NULL) {
return;
}
data_independent_addressing = (instance->type == Argon2_i) ||
(instance->type == Argon2_id && (position.pass == 0) &&
(position.slice < ARGON2_SYNC_POINTS / 2));
if (data_independent_addressing) {
init_block_value(&zero_block, 0);
init_block_value(&input_block, 0);
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;
}
starting_index = 0;
if ((0 == position.pass) && (0 == position.slice)) {
starting_index = 2; /* we have already generated the first two blocks */
/* Don't forget to generate the first block of addresses: */
if (data_independent_addressing) {
next_addresses(&address_block, &input_block, &zero_block);
}
}
/* 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;
}
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) {
if (i % ARGON2_ADDRESSES_IN_BLOCK == 0) {
next_addresses(&address_block, &input_block, &zero_block);
}
pseudo_rand = address_block.v[i % ARGON2_ADDRESSES_IN_BLOCK];
} 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;
prev_block = instance->memory + prev_offset;
/* version 1.2.1 and earlier: overwrite, not XOR */
if (0 == position.pass || ARGON2_VERSION_10 == instance->version) {
fill_block(prev_block, ref_block, curr_block, 0);
} else {
fill_block(prev_block, ref_block, curr_block, 1);
}
}
}
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