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src/secp256k1/src/bench_ecmult.c
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/********************************************************************** | |||||
* Copyright (c) 2017 Pieter Wuille * | |||||
* Distributed under the MIT software license, see the accompanying * | |||||
* file COPYING or http://www.opensource.org/licenses/mit-license.php.* | |||||
**********************************************************************/ | |||||
#include <stdio.h> | |||||
#include "include/secp256k1.h" | |||||
#include "util.h" | |||||
#include "hash_impl.h" | |||||
#include "num_impl.h" | |||||
#include "field_impl.h" | |||||
#include "group_impl.h" | |||||
#include "scalar_impl.h" | |||||
#include "ecmult_impl.h" | |||||
#include "bench.h" | |||||
#include "secp256k1.c" | |||||
#define POINTS 32768 | |||||
#define ITERS 10000 | |||||
typedef struct { | |||||
/* Setup once in advance */ | |||||
secp256k1_context* ctx; | |||||
secp256k1_scratch_space* scratch; | |||||
secp256k1_scalar* scalars; | |||||
secp256k1_ge* pubkeys; | |||||
secp256k1_scalar* seckeys; | |||||
secp256k1_gej* expected_output; | |||||
secp256k1_ecmult_multi_func ecmult_multi; | |||||
/* Changes per test */ | |||||
size_t count; | |||||
int includes_g; | |||||
/* Changes per test iteration */ | |||||
size_t offset1; | |||||
size_t offset2; | |||||
/* Test output. */ | |||||
secp256k1_gej* output; | |||||
} bench_data; | |||||
static int bench_callback(secp256k1_scalar* sc, secp256k1_ge* ge, size_t idx, void* arg) { | |||||
bench_data* data = (bench_data*)arg; | |||||
if (data->includes_g) ++idx; | |||||
if (idx == 0) { | |||||
*sc = data->scalars[data->offset1]; | |||||
*ge = secp256k1_ge_const_g; | |||||
} else { | |||||
*sc = data->scalars[(data->offset1 + idx) % POINTS]; | |||||
*ge = data->pubkeys[(data->offset2 + idx - 1) % POINTS]; | |||||
} | |||||
return 1; | |||||
} | |||||
static void bench_ecmult(void* arg) { | |||||
bench_data* data = (bench_data*)arg; | |||||
size_t count = data->count; | |||||
int includes_g = data->includes_g; | |||||
size_t iters = 1 + ITERS / count; | |||||
size_t iter; | |||||
for (iter = 0; iter < iters; ++iter) { | |||||
data->ecmult_multi(&data->ctx->ecmult_ctx, data->scratch, &data->output[iter], data->includes_g ? &data->scalars[data->offset1] : NULL, bench_callback, arg, count - includes_g); | |||||
data->offset1 = (data->offset1 + count) % POINTS; | |||||
data->offset2 = (data->offset2 + count - 1) % POINTS; | |||||
} | |||||
} | |||||
static void bench_ecmult_setup(void* arg) { | |||||
bench_data* data = (bench_data*)arg; | |||||
data->offset1 = (data->count * 0x537b7f6f + 0x8f66a481) % POINTS; | |||||
data->offset2 = (data->count * 0x7f6f537b + 0x6a1a8f49) % POINTS; | |||||
} | |||||
static void bench_ecmult_teardown(void* arg) { | |||||
bench_data* data = (bench_data*)arg; | |||||
size_t iters = 1 + ITERS / data->count; | |||||
size_t iter; | |||||
/* Verify the results in teardown, to avoid doing comparisons while benchmarking. */ | |||||
for (iter = 0; iter < iters; ++iter) { | |||||
secp256k1_gej tmp; | |||||
secp256k1_gej_add_var(&tmp, &data->output[iter], &data->expected_output[iter], NULL); | |||||
CHECK(secp256k1_gej_is_infinity(&tmp)); | |||||
} | |||||
} | |||||
static void generate_scalar(uint32_t num, secp256k1_scalar* scalar) { | |||||
secp256k1_sha256 sha256; | |||||
unsigned char c[11] = {'e', 'c', 'm', 'u', 'l', 't', 0, 0, 0, 0}; | |||||
unsigned char buf[32]; | |||||
int overflow = 0; | |||||
c[6] = num; | |||||
c[7] = num >> 8; | |||||
c[8] = num >> 16; | |||||
c[9] = num >> 24; | |||||
secp256k1_sha256_initialize(&sha256); | |||||
secp256k1_sha256_write(&sha256, c, sizeof(c)); | |||||
secp256k1_sha256_finalize(&sha256, buf); | |||||
secp256k1_scalar_set_b32(scalar, buf, &overflow); | |||||
CHECK(!overflow); | |||||
} | |||||
static void run_test(bench_data* data, size_t count, int includes_g) { | |||||
char str[32]; | |||||
static const secp256k1_scalar zero = SECP256K1_SCALAR_CONST(0, 0, 0, 0, 0, 0, 0, 0); | |||||
size_t iters = 1 + ITERS / count; | |||||
size_t iter; | |||||
data->count = count; | |||||
data->includes_g = includes_g; | |||||
/* Compute (the negation of) the expected results directly. */ | |||||
data->offset1 = (data->count * 0x537b7f6f + 0x8f66a481) % POINTS; | |||||
data->offset2 = (data->count * 0x7f6f537b + 0x6a1a8f49) % POINTS; | |||||
for (iter = 0; iter < iters; ++iter) { | |||||
secp256k1_scalar tmp; | |||||
secp256k1_scalar total = data->scalars[(data->offset1++) % POINTS]; | |||||
size_t i = 0; | |||||
for (i = 0; i + 1 < count; ++i) { | |||||
secp256k1_scalar_mul(&tmp, &data->seckeys[(data->offset2++) % POINTS], &data->scalars[(data->offset1++) % POINTS]); | |||||
secp256k1_scalar_add(&total, &total, &tmp); | |||||
} | |||||
secp256k1_scalar_negate(&total, &total); | |||||
secp256k1_ecmult(&data->ctx->ecmult_ctx, &data->expected_output[iter], NULL, &zero, &total); | |||||
} | |||||
/* Run the benchmark. */ | |||||
sprintf(str, includes_g ? "ecmult_%ig" : "ecmult_%i", (int)count); | |||||
run_benchmark(str, bench_ecmult, bench_ecmult_setup, bench_ecmult_teardown, data, 10, count * (1 + ITERS / count)); | |||||
} | |||||
int main(int argc, char **argv) { | |||||
bench_data data; | |||||
int i, p; | |||||
secp256k1_gej* pubkeys_gej; | |||||
size_t scratch_size; | |||||
if (argc > 1) { | |||||
if(have_flag(argc, argv, "pippenger_wnaf")) { | |||||
printf("Using pippenger_wnaf:\n"); | |||||
data.ecmult_multi = secp256k1_ecmult_pippenger_batch_single; | |||||
} else if(have_flag(argc, argv, "strauss_wnaf")) { | |||||
printf("Using strauss_wnaf:\n"); | |||||
data.ecmult_multi = secp256k1_ecmult_strauss_batch_single; | |||||
} | |||||
} else { | |||||
data.ecmult_multi = secp256k1_ecmult_multi_var; | |||||
} | |||||
/* Allocate stuff */ | |||||
data.ctx = secp256k1_context_create(SECP256K1_CONTEXT_SIGN | SECP256K1_CONTEXT_VERIFY); | |||||
scratch_size = secp256k1_strauss_scratch_size(POINTS) + STRAUSS_SCRATCH_OBJECTS*16; | |||||
data.scratch = secp256k1_scratch_space_create(data.ctx, scratch_size, scratch_size); | |||||
data.scalars = malloc(sizeof(secp256k1_scalar) * POINTS); | |||||
data.seckeys = malloc(sizeof(secp256k1_scalar) * POINTS); | |||||
data.pubkeys = malloc(sizeof(secp256k1_ge) * POINTS); | |||||
data.expected_output = malloc(sizeof(secp256k1_gej) * (ITERS + 1)); | |||||
data.output = malloc(sizeof(secp256k1_gej) * (ITERS + 1)); | |||||
/* Generate a set of scalars, and private/public keypairs. */ | |||||
pubkeys_gej = malloc(sizeof(secp256k1_gej) * POINTS); | |||||
secp256k1_gej_set_ge(&pubkeys_gej[0], &secp256k1_ge_const_g); | |||||
secp256k1_scalar_set_int(&data.seckeys[0], 1); | |||||
for (i = 0; i < POINTS; ++i) { | |||||
generate_scalar(i, &data.scalars[i]); | |||||
if (i) { | |||||
secp256k1_gej_double_var(&pubkeys_gej[i], &pubkeys_gej[i - 1], NULL); | |||||
secp256k1_scalar_add(&data.seckeys[i], &data.seckeys[i - 1], &data.seckeys[i - 1]); | |||||
} | |||||
} | |||||
secp256k1_ge_set_all_gej_var(data.pubkeys, pubkeys_gej, POINTS, &data.ctx->error_callback); | |||||
free(pubkeys_gej); | |||||
for (i = 1; i <= 8; ++i) { | |||||
run_test(&data, i, 1); | |||||
} | |||||
for (p = 0; p <= 11; ++p) { | |||||
for (i = 9; i <= 16; ++i) { | |||||
run_test(&data, i << p, 1); | |||||
} | |||||
} | |||||
secp256k1_context_destroy(data.ctx); | |||||
secp256k1_scratch_space_destroy(data.scratch); | |||||
free(data.scalars); | |||||
free(data.pubkeys); | |||||
free(data.seckeys); | |||||
free(data.output); | |||||
free(data.expected_output); | |||||
return(0); | |||||
} |