Provide basic benchmarks for BN_mul() and BN_sqr().

2 files changed, 275 insertions, 2 deletions

diff --git a/src/regress/lib/libcrypto/bn/Makefile b/src/regress/lib/libcrypto/bn/Makefile
index 6e89e026b2..ad15acfac4 100644
--- a/src/regress/lib/libcrypto/bn/Makefile
+++ b/src/regress/lib/libcrypto/bn/Makefile
@@ -1,4 +1,4 @@
-#       $OpenBSD: Makefile,v 1.18 2022/12/17 22:31:10 tb Exp $
+#       $OpenBSD: Makefile,v 1.19 2023/01/21 13:24:39 jsing Exp $
 
 PROGS +=        bn_add_sub
 PROGS +=        bn_cmp
@@ -8,6 +8,7 @@ PROGS +=	bn_mod_exp2_mont
 PROGS +=        bn_mod_exp_zero
 PROGS +=        bn_mod_sqrt
 PROGS +=        bn_mont
+PROGS +=        bn_mul
 PROGS +=        bn_primes
 PROGS +=        bn_rand_interval
 PROGS +=        bn_shift
@@ -60,7 +61,8 @@ run-bc: bn_test.out
 
 CLEANFILES +=   bn_test.out bc.out
 
-benchmark: bn_shift
+benchmark: bn_mul bn_shift
+        ./bn_mul --benchmark
         ./bn_shift --benchmark
 .PHONY: benchmark
 
diff --git a/src/regress/lib/libcrypto/bn/bn_mul.c b/src/regress/lib/libcrypto/bn/bn_mul.c
new file mode 100644
index 0000000000..de1f5c6b76
--- /dev/null
+++ b/src/regress/lib/libcrypto/bn/bn_mul.c
@@ -0,0 +1,271 @@
+/*      $OpenBSD: bn_mul.c,v 1.1 2023/01/21 13:24:39 jsing Exp $ */
+/*
+ * Copyright (c) 2023 Joel Sing <jsing@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/time.h>
+
+#include <err.h>
+#include <signal.h>
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+#include <openssl/bn.h>
+
+static int
+benchmark_bn_mul_setup(BIGNUM *a, size_t a_bits, BIGNUM *b, size_t b_bits,
+    BIGNUM *r)
+{
+        if (!BN_rand(a, a_bits - 1, BN_RAND_TOP_ONE, BN_RAND_BOTTOM_ANY))
+                return 0;
+        if (!BN_rand(b, b_bits - 1, BN_RAND_TOP_ONE, BN_RAND_BOTTOM_ANY))
+                return 0;
+        if (!BN_set_bit(r, (a_bits + b_bits) - 1))
+                return 0;
+
+        return 1;
+}
+
+static void
+benchmark_bn_mul_run_once(BIGNUM *r, BIGNUM *a, BIGNUM *b, BN_CTX *bn_ctx)
+{
+        if (!BN_mul(r, a, b, bn_ctx))
+                errx(1, "BN_mul");
+}
+
+static int
+benchmark_bn_sqr_setup(BIGNUM *a, size_t a_bits, BIGNUM *b, size_t b_bits,
+    BIGNUM *r)
+{
+        if (!BN_rand(a, a_bits - 1, BN_RAND_TOP_ONE, BN_RAND_BOTTOM_ANY))
+                return 0;
+        if (!BN_set_bit(r, (a_bits + a_bits) - 1))
+                return 0;
+
+        return 1;
+}
+
+static void
+benchmark_bn_sqr_run_once(BIGNUM *r, BIGNUM *a, BIGNUM *b, BN_CTX *bn_ctx)
+{
+        if (!BN_sqr(r, a, bn_ctx))
+                errx(1, "BN_sqr");
+}
+
+struct benchmark {
+        const char *desc;
+        int (*setup)(BIGNUM *, size_t, BIGNUM *, size_t, BIGNUM *);
+        void (*run_once)(BIGNUM *, BIGNUM *, BIGNUM *, BN_CTX *);
+        size_t a_bits;
+        size_t b_bits;
+};
+
+struct benchmark benchmarks[] = {
+        {
+                .desc = "BN_mul (128 bit x 128 bit)",
+                .setup = benchmark_bn_mul_setup,
+                .run_once = benchmark_bn_mul_run_once,
+                .a_bits = 128,
+                .b_bits = 128,
+        },
+        {
+                .desc = "BN_mul (128 bit x 256 bit)",
+                .setup = benchmark_bn_mul_setup,
+                .run_once = benchmark_bn_mul_run_once,
+                .a_bits = 128,
+                .b_bits = 256,
+        },
+        {
+                .desc = "BN_mul (256 bit x 256 bit)",
+                .setup = benchmark_bn_mul_setup,
+                .run_once = benchmark_bn_mul_run_once,
+                .a_bits = 256,
+                .b_bits = 256,
+        },
+        {
+                .desc = "BN_mul (512 bit x 512 bit)",
+                .setup = benchmark_bn_mul_setup,
+                .run_once = benchmark_bn_mul_run_once,
+                .a_bits = 512,
+                .b_bits = 512,
+        },
+        {
+                .desc = "BN_mul (1024 bit x 1024 bit)",
+                .setup = benchmark_bn_mul_setup,
+                .run_once = benchmark_bn_mul_run_once,
+                .a_bits = 1024,
+                .b_bits = 1024,
+        },
+        {
+                .desc = "BN_mul (1024 bit x 2048 bit)",
+                .setup = benchmark_bn_mul_setup,
+                .run_once = benchmark_bn_mul_run_once,
+                .a_bits = 1024,
+                .b_bits = 2048,
+        },
+        {
+                .desc = "BN_mul (2048 bit x 2048 bit)",
+                .setup = benchmark_bn_mul_setup,
+                .run_once = benchmark_bn_mul_run_once,
+                .a_bits = 2048,
+                .b_bits = 2048,
+        },
+        {
+                .desc = "BN_mul (4096 bit x 4096 bit)",
+                .setup = benchmark_bn_mul_setup,
+                .run_once = benchmark_bn_mul_run_once,
+                .a_bits = 4096,
+                .b_bits = 4096,
+        },
+        {
+                .desc = "BN_mul (4096 bit x 8192 bit)",
+                .setup = benchmark_bn_mul_setup,
+                .run_once = benchmark_bn_mul_run_once,
+                .a_bits = 4096,
+                .b_bits = 8192,
+        },
+        {
+                .desc = "BN_mul (8192 bit x 8192 bit)",
+                .setup = benchmark_bn_mul_setup,
+                .run_once = benchmark_bn_mul_run_once,
+                .a_bits = 8192,
+                .b_bits = 8192,
+        },
+        {
+                .desc = "BN_sqr (128 bit)",
+                .setup = benchmark_bn_sqr_setup,
+                .run_once = benchmark_bn_sqr_run_once,
+                .a_bits = 128,
+        },
+        {
+                .desc = "BN_sqr (256 bit)",
+                .setup = benchmark_bn_sqr_setup,
+                .run_once = benchmark_bn_sqr_run_once,
+                .a_bits = 256,
+        },
+        {
+                .desc = "BN_sqr (512 bit)",
+                .setup = benchmark_bn_sqr_setup,
+                .run_once = benchmark_bn_sqr_run_once,
+                .a_bits = 512,
+        },
+        {
+                .desc = "BN_sqr (1024 bit)",
+                .setup = benchmark_bn_sqr_setup,
+                .run_once = benchmark_bn_sqr_run_once,
+                .a_bits = 1024,
+        },
+        {
+                .desc = "BN_sqr (2048 bit)",
+                .setup = benchmark_bn_sqr_setup,
+                .run_once = benchmark_bn_sqr_run_once,
+                .a_bits = 2048,
+        },
+        {
+                .desc = "BN_sqr (4096 bit)",
+                .setup = benchmark_bn_sqr_setup,
+                .run_once = benchmark_bn_sqr_run_once,
+                .a_bits = 4096,
+        },
+        {
+                .desc = "BN_sqr (8192 bit)",
+                .setup = benchmark_bn_sqr_setup,
+                .run_once = benchmark_bn_sqr_run_once,
+                .a_bits = 8192,
+        },
+};
+
+#define N_BENCHMARKS (sizeof(benchmarks) / sizeof(benchmarks[0]))
+
+static volatile sig_atomic_t benchmark_stop;
+
+static void
+benchmark_sig_alarm(int sig)
+{
+        benchmark_stop = 1;
+}
+
+static void
+benchmark_run(const struct benchmark *bm, int seconds)
+{
+        struct timespec start, end, duration;
+        BIGNUM *a, *b, *r;
+        BN_CTX *bn_ctx;
+        int i;
+
+        signal(SIGALRM, benchmark_sig_alarm);
+
+        if ((bn_ctx = BN_CTX_new()) == NULL)
+                errx(1, "BN_CTX_new");
+
+        BN_CTX_start(bn_ctx);
+
+        if ((a = BN_CTX_get(bn_ctx)) == NULL)
+                errx(1, "BN_CTX_get");
+        if ((b = BN_CTX_get(bn_ctx)) == NULL)
+                errx(1, "BN_CTX_get");
+        if ((r = BN_CTX_get(bn_ctx)) == NULL)
+                errx(1, "BN_CTX_get");
+
+        if (!bm->setup(a, bm->a_bits, b, bm->b_bits, r))
+                errx(1, "benchmark setup failed");
+
+        benchmark_stop = 0;
+        i = 0;
+        alarm(seconds);
+
+        clock_gettime(CLOCK_MONOTONIC, &start);
+
+        fprintf(stderr, "Benchmarking %s for %ds: ", bm->desc, seconds);
+        while (!benchmark_stop) {
+                bm->run_once(r, a, b, bn_ctx);
+                i++;
+        }
+        clock_gettime(CLOCK_MONOTONIC, &end);
+        timespecsub(&end, &start, &duration);
+        fprintf(stderr, "%d iterations in %f seconds\n", i,
+            duration.tv_sec + duration.tv_nsec / 1000000000.0);
+
+        BN_CTX_end(bn_ctx);
+        BN_CTX_free(bn_ctx);
+}
+
+static void
+benchmark_bn_mul_sqr(void)
+{
+        const struct benchmark *bm;
+        size_t i;
+
+        for (i = 0; i < N_BENCHMARKS; i++) {
+                bm = &benchmarks[i];
+                benchmark_run(bm, 5);
+        }
+}
+
+int
+main(int argc, char **argv)
+{
+        int benchmark = 0, failed = 0;
+
+        if (argc == 2 && strcmp(argv[1], "--benchmark") == 0)
+                benchmark = 1;
+
+        if (benchmark && !failed)
+                benchmark_bn_mul_sqr();
+
+        return failed;
+}