2 * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
14 #include "internal/nelem.h"
16 #include <openssl/bio.h>
17 #include <openssl/bn.h>
18 #include <openssl/rand.h>
19 #include <openssl/err.h>
23 #define NUM_BITS (BN_BITS2 * 4)
25 #define BN_print_var(v) test_output_bignum(#v, v)
28 * Test that r == 0 in test_exp_mod_zero(). Returns one on success,
29 * returns zero and prints debug output otherwise.
31 static int a_is_zero_mod_one(const char *method, const BIGNUM *r,
35 TEST_error("%s failed: a ** 0 mod 1 = r (should be 0)", method);
44 * test_mod_exp_zero tests that x**0 mod 1 == 0. It returns zero on success.
46 static int test_mod_exp_zero(void)
48 BIGNUM *a = NULL, *p = NULL, *m = NULL;
50 BN_ULONG one_word = 1;
51 BN_CTX *ctx = BN_CTX_new();
52 int ret = 1, failed = 0;
53 BN_MONT_CTX *mont = NULL;
55 if (!TEST_ptr(m = BN_new())
56 || !TEST_ptr(a = BN_new())
57 || !TEST_ptr(p = BN_new())
58 || !TEST_ptr(r = BN_new()))
65 if (!TEST_true(BN_rand(a, 1024, BN_RAND_TOP_ONE, BN_RAND_BOTTOM_ANY)))
68 if (!TEST_true(BN_mod_exp(r, a, p, m, ctx)))
71 if (!TEST_true(a_is_zero_mod_one("BN_mod_exp", r, a)))
74 if (!TEST_true(BN_mod_exp_recp(r, a, p, m, ctx)))
77 if (!TEST_true(a_is_zero_mod_one("BN_mod_exp_recp", r, a)))
80 if (!TEST_true(BN_mod_exp_simple(r, a, p, m, ctx)))
83 if (!TEST_true(a_is_zero_mod_one("BN_mod_exp_simple", r, a)))
86 if (!TEST_true(BN_mod_exp_mont(r, a, p, m, ctx, NULL)))
89 if (!TEST_true(a_is_zero_mod_one("BN_mod_exp_mont", r, a)))
92 if (!TEST_true(BN_mod_exp_mont_consttime(r, a, p, m, ctx, NULL)))
95 if (!TEST_true(a_is_zero_mod_one("BN_mod_exp_mont_consttime", r, a)))
98 if (!TEST_ptr(mont = BN_MONT_CTX_new()))
102 /* mont is not set but passed in */
103 if (!TEST_false(BN_mod_exp_mont_consttime(r, a, p, m, ctx, mont)))
107 if (!TEST_true(BN_MONT_CTX_set(mont, m, ctx)))
110 if (!TEST_true(BN_mod_exp_mont_consttime(r, a, p, m, ctx, mont)))
113 if (!TEST_true(a_is_zero_mod_one("BN_mod_exp_mont_consttime", r, a)))
117 * A different codepath exists for single word multiplication
118 * in non-constant-time only.
120 if (!TEST_true(BN_mod_exp_mont_word(r, one_word, p, m, ctx, NULL)))
123 if (!TEST_BN_eq_zero(r)) {
124 TEST_error("BN_mod_exp_mont_word failed: "
125 "1 ** 0 mod 1 = r (should be 0)");
136 BN_MONT_CTX_free(mont);
142 static int test_mod_exp(int round)
147 BIGNUM *r_mont = NULL;
148 BIGNUM *r_mont_const = NULL;
149 BIGNUM *r_recp = NULL;
150 BIGNUM *r_simple = NULL;
155 if (!TEST_ptr(ctx = BN_CTX_new()))
158 if (!TEST_ptr(r_mont = BN_new())
159 || !TEST_ptr(r_mont_const = BN_new())
160 || !TEST_ptr(r_recp = BN_new())
161 || !TEST_ptr(r_simple = BN_new())
162 || !TEST_ptr(a = BN_new())
163 || !TEST_ptr(b = BN_new())
164 || !TEST_ptr(m = BN_new()))
167 if (!TEST_int_gt(RAND_bytes(&c, 1), 0))
169 c = (c % BN_BITS) - BN_BITS2;
170 if (!TEST_true(BN_rand(a, NUM_BITS + c, BN_RAND_TOP_ONE,
171 BN_RAND_BOTTOM_ANY)))
174 if (!TEST_int_gt(RAND_bytes(&c, 1), 0))
176 c = (c % BN_BITS) - BN_BITS2;
177 if (!TEST_true(BN_rand(b, NUM_BITS + c, BN_RAND_TOP_ONE,
178 BN_RAND_BOTTOM_ANY)))
181 if (!TEST_int_gt(RAND_bytes(&c, 1), 0))
183 c = (c % BN_BITS) - BN_BITS2;
184 if (!TEST_true(BN_rand(m, NUM_BITS + c, BN_RAND_TOP_ONE,
185 BN_RAND_BOTTOM_ODD)))
188 if (!TEST_true(BN_mod(a, a, m, ctx))
189 || !TEST_true(BN_mod(b, b, m, ctx))
190 || !TEST_true(BN_mod_exp_mont(r_mont, a, b, m, ctx, NULL))
191 || !TEST_true(BN_mod_exp_recp(r_recp, a, b, m, ctx))
192 || !TEST_true(BN_mod_exp_simple(r_simple, a, b, m, ctx))
193 || !TEST_true(BN_mod_exp_mont_consttime(r_mont_const, a, b, m, ctx, NULL)))
196 if (!TEST_BN_eq(r_simple, r_mont)
197 || !TEST_BN_eq(r_simple, r_recp)
198 || !TEST_BN_eq(r_simple, r_mont_const)) {
199 if (BN_cmp(r_simple, r_mont) != 0)
200 TEST_info("simple and mont results differ");
201 if (BN_cmp(r_simple, r_mont_const) != 0)
202 TEST_info("simple and mont const time results differ");
203 if (BN_cmp(r_simple, r_recp) != 0)
204 TEST_info("simple and recp results differ");
209 BN_print_var(r_simple);
210 BN_print_var(r_recp);
211 BN_print_var(r_mont);
212 BN_print_var(r_mont_const);
219 BN_free(r_mont_const);
230 static int test_mod_exp_x2(int idx)
234 BIGNUM *r_mont_const_x2_1 = NULL;
235 BIGNUM *r_mont_const_x2_2 = NULL;
236 BIGNUM *r_simple1 = NULL;
237 BIGNUM *r_simple2 = NULL;
253 if (!TEST_ptr(ctx = BN_CTX_new()))
256 if (!TEST_ptr(r_mont_const_x2_1 = BN_new())
257 || !TEST_ptr(r_mont_const_x2_2 = BN_new())
258 || !TEST_ptr(r_simple1 = BN_new())
259 || !TEST_ptr(r_simple2 = BN_new())
260 || !TEST_ptr(a1 = BN_new())
261 || !TEST_ptr(b1 = BN_new())
262 || !TEST_ptr(m1 = BN_new())
263 || !TEST_ptr(a2 = BN_new())
264 || !TEST_ptr(b2 = BN_new())
265 || !TEST_ptr(m2 = BN_new()))
268 BN_rand(a1, factor_size, BN_RAND_TOP_ONE, BN_RAND_BOTTOM_ANY);
269 BN_rand(b1, factor_size, BN_RAND_TOP_ONE, BN_RAND_BOTTOM_ANY);
270 BN_rand(m1, factor_size, BN_RAND_TOP_ONE, BN_RAND_BOTTOM_ODD);
271 BN_rand(a2, factor_size, BN_RAND_TOP_ONE, BN_RAND_BOTTOM_ANY);
272 BN_rand(b2, factor_size, BN_RAND_TOP_ONE, BN_RAND_BOTTOM_ANY);
273 BN_rand(m2, factor_size, BN_RAND_TOP_ONE, BN_RAND_BOTTOM_ODD);
275 if (!TEST_true(BN_mod(a1, a1, m1, ctx))
276 || !TEST_true(BN_mod(b1, b1, m1, ctx))
277 || !TEST_true(BN_mod(a2, a2, m2, ctx))
278 || !TEST_true(BN_mod(b2, b2, m2, ctx))
279 || !TEST_true(BN_mod_exp_simple(r_simple1, a1, b1, m1, ctx))
280 || !TEST_true(BN_mod_exp_simple(r_simple2, a2, b2, m2, ctx))
281 || !TEST_true(BN_mod_exp_mont_consttime_x2(r_mont_const_x2_1, a1, b1, m1, NULL,
282 r_mont_const_x2_2, a2, b2, m2, NULL,
286 if (!TEST_BN_eq(r_simple1, r_mont_const_x2_1)
287 || !TEST_BN_eq(r_simple2, r_mont_const_x2_2)) {
288 if (BN_cmp(r_simple1, r_mont_const_x2_1) != 0)
289 TEST_info("simple and mont const time x2 (#1) results differ");
290 if (BN_cmp(r_simple2, r_mont_const_x2_2) != 0)
291 TEST_info("simple and mont const time x2 (#2) results differ");
299 BN_print_var(r_simple1);
300 BN_print_var(r_simple2);
301 BN_print_var(r_mont_const_x2_1);
302 BN_print_var(r_mont_const_x2_2);
308 BN_free(r_mont_const_x2_1);
309 BN_free(r_mont_const_x2_2);
323 int setup_tests(void)
325 ADD_TEST(test_mod_exp_zero);
326 ADD_ALL_TESTS(test_mod_exp, 200);
327 ADD_ALL_TESTS(test_mod_exp_x2, 300);