diff options
Diffstat (limited to 'openssl-1.1.0h/test/exptest.c')
| -rw-r--r-- | openssl-1.1.0h/test/exptest.c | 270 |
1 files changed, 270 insertions, 0 deletions
diff --git a/openssl-1.1.0h/test/exptest.c b/openssl-1.1.0h/test/exptest.c new file mode 100644 index 0000000..9bc6e75 --- /dev/null +++ b/openssl-1.1.0h/test/exptest.c @@ -0,0 +1,270 @@ +/* + * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the OpenSSL license (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "../e_os.h" + +#include <openssl/bio.h> +#include <openssl/bn.h> +#include <openssl/rand.h> +#include <openssl/err.h> + +#define NUM_BITS (BN_BITS2 * 4) + +static const char rnd_seed[] = + "string to make the random number generator think it has entropy"; + +/* + * Test that r == 0 in test_exp_mod_zero(). Returns one on success, + * returns zero and prints debug output otherwise. + */ +static int a_is_zero_mod_one(const char *method, const BIGNUM *r, + const BIGNUM *a) { + if (!BN_is_zero(r)) { + fprintf(stderr, "%s failed:\n", method); + fprintf(stderr, "a ** 0 mod 1 = r (should be 0)\n"); + fprintf(stderr, "a = "); + BN_print_fp(stderr, a); + fprintf(stderr, "\nr = "); + BN_print_fp(stderr, r); + fprintf(stderr, "\n"); + return 0; + } + return 1; +} + +/* + * test_exp_mod_zero tests that x**0 mod 1 == 0. It returns zero on success. + */ +static int test_exp_mod_zero() +{ + BIGNUM *a = NULL, *p = NULL, *m = NULL; + BIGNUM *r = NULL; + BN_ULONG one_word = 1; + BN_CTX *ctx = BN_CTX_new(); + int ret = 1, failed = 0; + + m = BN_new(); + if (!m) + goto err; + BN_one(m); + + a = BN_new(); + if (!a) + goto err; + BN_one(a); + + p = BN_new(); + if (!p) + goto err; + BN_zero(p); + + r = BN_new(); + if (!r) + goto err; + + if (!BN_rand(a, 1024, BN_RAND_TOP_ONE, BN_RAND_BOTTOM_ANY)) + goto err; + + if (!BN_mod_exp(r, a, p, m, ctx)) + goto err; + + if (!a_is_zero_mod_one("BN_mod_exp", r, a)) + failed = 1; + + if (!BN_mod_exp_recp(r, a, p, m, ctx)) + goto err; + + if (!a_is_zero_mod_one("BN_mod_exp_recp", r, a)) + failed = 1; + + if (!BN_mod_exp_simple(r, a, p, m, ctx)) + goto err; + + if (!a_is_zero_mod_one("BN_mod_exp_simple", r, a)) + failed = 1; + + if (!BN_mod_exp_mont(r, a, p, m, ctx, NULL)) + goto err; + + if (!a_is_zero_mod_one("BN_mod_exp_mont", r, a)) + failed = 1; + + if (!BN_mod_exp_mont_consttime(r, a, p, m, ctx, NULL)) { + goto err; + } + + if (!a_is_zero_mod_one("BN_mod_exp_mont_consttime", r, a)) + failed = 1; + + /* + * A different codepath exists for single word multiplication + * in non-constant-time only. + */ + if (!BN_mod_exp_mont_word(r, one_word, p, m, ctx, NULL)) + goto err; + + if (!BN_is_zero(r)) { + fprintf(stderr, "BN_mod_exp_mont_word failed:\n"); + fprintf(stderr, "1 ** 0 mod 1 = r (should be 0)\n"); + fprintf(stderr, "r = "); + BN_print_fp(stderr, r); + fprintf(stderr, "\n"); + return 0; + } + + ret = failed; + + err: + BN_free(r); + BN_free(a); + BN_free(p); + BN_free(m); + BN_CTX_free(ctx); + + return ret; +} + +int main(int argc, char *argv[]) +{ + BN_CTX *ctx; + BIO *out = NULL; + int i, ret; + unsigned char c; + BIGNUM *r_mont, *r_mont_const, *r_recp, *r_simple, *a, *b, *m; + + /* + * Seed or BN_rand may fail, and we don't even check its return + * value (which we should) + */ + RAND_seed(rnd_seed, sizeof(rnd_seed)); + + ctx = BN_CTX_new(); + if (ctx == NULL) + EXIT(1); + r_mont = BN_new(); + r_mont_const = BN_new(); + r_recp = BN_new(); + r_simple = BN_new(); + a = BN_new(); + b = BN_new(); + m = BN_new(); + if ((r_mont == NULL) || (r_recp == NULL) || (a == NULL) || (b == NULL)) + goto err; + + out = BIO_new(BIO_s_file()); + + if (out == NULL) + EXIT(1); + BIO_set_fp(out, stdout, BIO_NOCLOSE | BIO_FP_TEXT); + + for (i = 0; i < 200; i++) { + RAND_bytes(&c, 1); + c = (c % BN_BITS) - BN_BITS2; + BN_rand(a, NUM_BITS + c, BN_RAND_TOP_ONE, BN_RAND_BOTTOM_ANY); + + RAND_bytes(&c, 1); + c = (c % BN_BITS) - BN_BITS2; + BN_rand(b, NUM_BITS + c, BN_RAND_TOP_ONE, BN_RAND_BOTTOM_ANY); + + RAND_bytes(&c, 1); + c = (c % BN_BITS) - BN_BITS2; + BN_rand(m, NUM_BITS + c, BN_RAND_TOP_ONE, BN_RAND_BOTTOM_ODD); + + BN_mod(a, a, m, ctx); + BN_mod(b, b, m, ctx); + + ret = BN_mod_exp_mont(r_mont, a, b, m, ctx, NULL); + if (ret <= 0) { + printf("BN_mod_exp_mont() problems\n"); + ERR_print_errors(out); + EXIT(1); + } + + ret = BN_mod_exp_recp(r_recp, a, b, m, ctx); + if (ret <= 0) { + printf("BN_mod_exp_recp() problems\n"); + ERR_print_errors(out); + EXIT(1); + } + + ret = BN_mod_exp_simple(r_simple, a, b, m, ctx); + if (ret <= 0) { + printf("BN_mod_exp_simple() problems\n"); + ERR_print_errors(out); + EXIT(1); + } + + ret = BN_mod_exp_mont_consttime(r_mont_const, a, b, m, ctx, NULL); + if (ret <= 0) { + printf("BN_mod_exp_mont_consttime() problems\n"); + ERR_print_errors(out); + EXIT(1); + } + + if (BN_cmp(r_simple, r_mont) == 0 + && BN_cmp(r_simple, r_recp) == 0 + && BN_cmp(r_simple, r_mont_const) == 0) { + printf("."); + fflush(stdout); + } else { + if (BN_cmp(r_simple, r_mont) != 0) + printf("\nsimple and mont results differ\n"); + if (BN_cmp(r_simple, r_mont_const) != 0) + printf("\nsimple and mont const time results differ\n"); + if (BN_cmp(r_simple, r_recp) != 0) + printf("\nsimple and recp results differ\n"); + + printf("a (%3d) = ", BN_num_bits(a)); + BN_print(out, a); + printf("\nb (%3d) = ", BN_num_bits(b)); + BN_print(out, b); + printf("\nm (%3d) = ", BN_num_bits(m)); + BN_print(out, m); + printf("\nsimple ="); + BN_print(out, r_simple); + printf("\nrecp ="); + BN_print(out, r_recp); + printf("\nmont ="); + BN_print(out, r_mont); + printf("\nmont_ct ="); + BN_print(out, r_mont_const); + printf("\n"); + EXIT(1); + } + } + BN_free(r_mont); + BN_free(r_mont_const); + BN_free(r_recp); + BN_free(r_simple); + BN_free(a); + BN_free(b); + BN_free(m); + BN_CTX_free(ctx); + + if (test_exp_mod_zero() != 0) + goto err; + +#ifndef OPENSSL_NO_CRYPTO_MDEBUG + if (CRYPTO_mem_leaks(out) <= 0) + goto err; +#endif + BIO_free(out); + printf("\n"); + + printf("done\n"); + + EXIT(0); + err: + ERR_print_errors(out); + EXIT(1); +} |