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440e5d80 | 1 | /* |
58e754fc | 2 | * Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved. |
d02b48c6 | 3 | * |
440e5d80 RS |
4 | * Licensed under the OpenSSL license (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 | |
d02b48c6 RE |
8 | */ |
9 | ||
10 | #include <stdio.h> | |
11 | #include <stdlib.h> | |
12 | #include <string.h> | |
55f78baf | 13 | |
b99fe5f4 | 14 | #include <internal/nelem.h> |
55f78baf | 15 | |
ec577822 BM |
16 | #include <openssl/bio.h> |
17 | #include <openssl/bn.h> | |
18 | #include <openssl/rand.h> | |
19 | #include <openssl/err.h> | |
d02b48c6 | 20 | |
58e754fc RS |
21 | #include "testutil.h" |
22 | ||
94af0cd7 | 23 | #define NUM_BITS (BN_BITS2 * 4) |
0f113f3e | 24 | |
37916462 | 25 | #define BN_print_var(v) test_output_bignum(#v, v) |
0f113f3e | 26 | |
d911097d EK |
27 | /* |
28 | * Test that r == 0 in test_exp_mod_zero(). Returns one on success, | |
29 | * returns zero and prints debug output otherwise. | |
30 | */ | |
31 | static int a_is_zero_mod_one(const char *method, const BIGNUM *r, | |
58e754fc RS |
32 | const BIGNUM *a) |
33 | { | |
d911097d | 34 | if (!BN_is_zero(r)) { |
37916462 | 35 | TEST_error("%s failed: a ** 0 mod 1 = r (should be 0)", method); |
58e754fc RS |
36 | BN_print_var(a); |
37 | BN_print_var(r); | |
d911097d EK |
38 | return 0; |
39 | } | |
40 | return 1; | |
41 | } | |
42 | ||
0f113f3e | 43 | /* |
58e754fc | 44 | * test_mod_exp_zero tests that x**0 mod 1 == 0. It returns zero on success. |
0f113f3e | 45 | */ |
31a80694 | 46 | static int test_mod_exp_zero(void) |
0f113f3e MC |
47 | { |
48 | BIGNUM *a = NULL, *p = NULL, *m = NULL; | |
49 | BIGNUM *r = NULL; | |
d911097d | 50 | BN_ULONG one_word = 1; |
0f113f3e | 51 | BN_CTX *ctx = BN_CTX_new(); |
d911097d | 52 | int ret = 1, failed = 0; |
0f113f3e | 53 | |
58e754fc RS |
54 | if (!TEST_ptr(m = BN_new()) |
55 | || !TEST_ptr(a = BN_new()) | |
56 | || !TEST_ptr(p = BN_new()) | |
57 | || !TEST_ptr(r = BN_new())) | |
0f113f3e | 58 | goto err; |
0f113f3e | 59 | |
58e754fc | 60 | BN_one(m); |
0f113f3e | 61 | BN_one(a); |
0f113f3e MC |
62 | BN_zero(p); |
63 | ||
58e754fc | 64 | if (!TEST_true(BN_rand(a, 1024, BN_RAND_TOP_ONE, BN_RAND_BOTTOM_ANY))) |
d911097d EK |
65 | goto err; |
66 | ||
58e754fc | 67 | if (!TEST_true(BN_mod_exp(r, a, p, m, ctx))) |
d911097d EK |
68 | goto err; |
69 | ||
58e754fc | 70 | if (!TEST_true(a_is_zero_mod_one("BN_mod_exp", r, a))) |
d911097d EK |
71 | failed = 1; |
72 | ||
58e754fc | 73 | if (!TEST_true(BN_mod_exp_recp(r, a, p, m, ctx))) |
d911097d EK |
74 | goto err; |
75 | ||
58e754fc | 76 | if (!TEST_true(a_is_zero_mod_one("BN_mod_exp_recp", r, a))) |
d911097d EK |
77 | failed = 1; |
78 | ||
58e754fc | 79 | if (!TEST_true(BN_mod_exp_simple(r, a, p, m, ctx))) |
d911097d EK |
80 | goto err; |
81 | ||
58e754fc | 82 | if (!TEST_true(a_is_zero_mod_one("BN_mod_exp_simple", r, a))) |
d911097d EK |
83 | failed = 1; |
84 | ||
58e754fc | 85 | if (!TEST_true(BN_mod_exp_mont(r, a, p, m, ctx, NULL))) |
d911097d EK |
86 | goto err; |
87 | ||
58e754fc | 88 | if (!TEST_true(a_is_zero_mod_one("BN_mod_exp_mont", r, a))) |
d911097d EK |
89 | failed = 1; |
90 | ||
58e754fc | 91 | if (!TEST_true(BN_mod_exp_mont_consttime(r, a, p, m, ctx, NULL))) |
d911097d | 92 | goto err; |
0f113f3e | 93 | |
58e754fc | 94 | if (!TEST_true(a_is_zero_mod_one("BN_mod_exp_mont_consttime", r, a))) |
d911097d EK |
95 | failed = 1; |
96 | ||
97 | /* | |
98 | * A different codepath exists for single word multiplication | |
99 | * in non-constant-time only. | |
100 | */ | |
58e754fc | 101 | if (!TEST_true(BN_mod_exp_mont_word(r, one_word, p, m, ctx, NULL))) |
d911097d EK |
102 | goto err; |
103 | ||
dc352c19 | 104 | if (!TEST_BN_eq_zero(r)) { |
37916462 P |
105 | TEST_error("BN_mod_exp_mont_word failed: " |
106 | "1 ** 0 mod 1 = r (should be 0)"); | |
58e754fc RS |
107 | BN_print_var(r); |
108 | goto err; | |
d911097d EK |
109 | } |
110 | ||
58e754fc | 111 | ret = !failed; |
0f113f3e MC |
112 | err: |
113 | BN_free(r); | |
114 | BN_free(a); | |
115 | BN_free(p); | |
116 | BN_free(m); | |
d911097d | 117 | BN_CTX_free(ctx); |
0f113f3e MC |
118 | |
119 | return ret; | |
2b0180c3 AL |
120 | } |
121 | ||
58e754fc | 122 | static int test_mod_exp(int round) |
0f113f3e MC |
123 | { |
124 | BN_CTX *ctx; | |
0f113f3e | 125 | unsigned char c; |
58e754fc RS |
126 | int ret = 0; |
127 | BIGNUM *r_mont = NULL; | |
128 | BIGNUM *r_mont_const = NULL; | |
129 | BIGNUM *r_recp = NULL; | |
130 | BIGNUM *r_simple = NULL; | |
131 | BIGNUM *a = NULL; | |
132 | BIGNUM *b = NULL; | |
133 | BIGNUM *m = NULL; | |
134 | ||
135 | if (!TEST_ptr(ctx = BN_CTX_new())) | |
136 | goto err; | |
137 | ||
138 | if (!TEST_ptr(r_mont = BN_new()) | |
139 | || !TEST_ptr(r_mont_const = BN_new()) | |
140 | || !TEST_ptr(r_recp = BN_new()) | |
141 | || !TEST_ptr(r_simple = BN_new()) | |
142 | || !TEST_ptr(a = BN_new()) | |
143 | || !TEST_ptr(b = BN_new()) | |
144 | || !TEST_ptr(m = BN_new())) | |
0f113f3e MC |
145 | goto err; |
146 | ||
58e754fc RS |
147 | RAND_bytes(&c, 1); |
148 | c = (c % BN_BITS) - BN_BITS2; | |
149 | BN_rand(a, NUM_BITS + c, BN_RAND_TOP_ONE, BN_RAND_BOTTOM_ANY); | |
150 | ||
151 | RAND_bytes(&c, 1); | |
152 | c = (c % BN_BITS) - BN_BITS2; | |
153 | BN_rand(b, NUM_BITS + c, BN_RAND_TOP_ONE, BN_RAND_BOTTOM_ANY); | |
154 | ||
155 | RAND_bytes(&c, 1); | |
156 | c = (c % BN_BITS) - BN_BITS2; | |
157 | BN_rand(m, NUM_BITS + c, BN_RAND_TOP_ONE, BN_RAND_BOTTOM_ODD); | |
158 | ||
9e206ce5 P |
159 | if (!TEST_true(BN_mod(a, a, m, ctx)) |
160 | || !TEST_true(BN_mod(b, b, m, ctx)) | |
161 | || !TEST_true(BN_mod_exp_mont(r_mont, a, b, m, ctx, NULL)) | |
58e754fc RS |
162 | || !TEST_true(BN_mod_exp_recp(r_recp, a, b, m, ctx)) |
163 | || !TEST_true(BN_mod_exp_simple(r_simple, a, b, m, ctx)) | |
164 | || !TEST_true(BN_mod_exp_mont_consttime(r_mont_const, a, b, m, ctx, NULL))) | |
165 | goto err; | |
166 | ||
dc352c19 P |
167 | if (!TEST_BN_eq(r_simple, r_mont) |
168 | || !TEST_BN_eq(r_simple, r_recp) | |
169 | || !TEST_BN_eq(r_simple, r_mont_const)) { | |
58e754fc | 170 | if (BN_cmp(r_simple, r_mont) != 0) |
dc352c19 | 171 | TEST_info("simple and mont results differ"); |
58e754fc | 172 | if (BN_cmp(r_simple, r_mont_const) != 0) |
dc352c19 | 173 | TEST_info("simple and mont const time results differ"); |
58e754fc | 174 | if (BN_cmp(r_simple, r_recp) != 0) |
dc352c19 | 175 | TEST_info("simple and recp results differ"); |
58e754fc RS |
176 | |
177 | BN_print_var(a); | |
178 | BN_print_var(b); | |
179 | BN_print_var(m); | |
180 | BN_print_var(r_simple); | |
181 | BN_print_var(r_recp); | |
182 | BN_print_var(r_mont); | |
183 | BN_print_var(r_mont_const); | |
184 | goto err; | |
0f113f3e | 185 | } |
58e754fc RS |
186 | |
187 | ret = 1; | |
188 | err: | |
0f113f3e MC |
189 | BN_free(r_mont); |
190 | BN_free(r_mont_const); | |
191 | BN_free(r_recp); | |
192 | BN_free(r_simple); | |
193 | BN_free(a); | |
194 | BN_free(b); | |
195 | BN_free(m); | |
196 | BN_CTX_free(ctx); | |
8793f012 | 197 | |
58e754fc RS |
198 | return ret; |
199 | } | |
0f113f3e | 200 | |
ad887416 | 201 | int setup_tests(void) |
58e754fc RS |
202 | { |
203 | ADD_TEST(test_mod_exp_zero); | |
204 | ADD_ALL_TESTS(test_mod_exp, 200); | |
ad887416 | 205 | return 1; |
0f113f3e | 206 | } |