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Add bench_ecmult

master
Pieter Wuille 3 years ago
parent
commit
bc65aa794e
2 changed files with 186 additions and 1 deletions
  1. 5
    1
      Makefile.am
  2. 181
    0
      src/bench_ecmult.c

+ 5
- 1
Makefile.am View File

@@ -81,7 +81,7 @@ libsecp256k1_jni_la_CPPFLAGS = -DSECP256K1_BUILD $(JNI_INCLUDES)

noinst_PROGRAMS =
if USE_BENCHMARK
noinst_PROGRAMS += bench_verify bench_sign bench_internal
noinst_PROGRAMS += bench_verify bench_sign bench_internal bench_ecmult
bench_verify_SOURCES = src/bench_verify.c
bench_verify_LDADD = libsecp256k1.la $(SECP_LIBS) $(SECP_TEST_LIBS) $(COMMON_LIB)
bench_sign_SOURCES = src/bench_sign.c
@@ -89,6 +89,9 @@ bench_sign_LDADD = libsecp256k1.la $(SECP_LIBS) $(SECP_TEST_LIBS) $(COMMON_LIB)
bench_internal_SOURCES = src/bench_internal.c
bench_internal_LDADD = $(SECP_LIBS) $(COMMON_LIB)
bench_internal_CPPFLAGS = -DSECP256K1_BUILD $(SECP_INCLUDES)
bench_ecmult_SOURCES = src/bench_ecmult.c
bench_ecmult_LDADD = $(SECP_LIBS) $(COMMON_LIB)
bench_ecmult_CPPFLAGS = -DSECP256K1_BUILD $(SECP_INCLUDES)
endif

TESTS =
@@ -161,6 +164,7 @@ $(gen_context_BIN): $(gen_context_OBJECTS)
$(libsecp256k1_la_OBJECTS): src/ecmult_static_context.h
$(tests_OBJECTS): src/ecmult_static_context.h
$(bench_internal_OBJECTS): src/ecmult_static_context.h
$(bench_ecmult_OBJECTS): src/ecmult_static_context.h

src/ecmult_static_context.h: $(gen_context_BIN)
./$(gen_context_BIN)

+ 181
- 0
src/bench_ecmult.c View File

@@ -0,0 +1,181 @@
/**********************************************************************
* 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;

/* 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) {
secp256k1_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;

/* Allocate stuff */
data.ctx = secp256k1_context_create(SECP256K1_CONTEXT_SIGN | SECP256K1_CONTEXT_VERIFY);
data.scratch = secp256k1_scratch_space_create(data.ctx, POINTS * 1024, POINTS * 5 * 1024);
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);
}

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