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1 | /* |
2 | * Copyright 2019 The OpenSSL Project Authors. All Rights Reserved. | |
3 | * | |
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 | |
8 | */ | |
9 | ||
10 | #include "internal/nelem.h" | |
11 | #include "testutil.h" | |
12 | #include <openssl/ec.h> | |
13 | #include "ec_lcl.h" | |
14 | #include <openssl/objects.h> | |
15 | ||
16 | static size_t crv_len = 0; | |
17 | static EC_builtin_curve *curves = NULL; | |
18 | ||
19 | /* sanity checks field_inv function pointer in EC_METHOD */ | |
20 | static int group_field_tests(const EC_GROUP *group, BN_CTX *ctx) | |
21 | { | |
22 | BIGNUM *a = NULL, *b = NULL, *c = NULL; | |
23 | int ret = 0; | |
24 | ||
25 | if (group->meth->field_inv == NULL || group->meth->field_mul == NULL) | |
26 | return 1; | |
27 | ||
28 | BN_CTX_start(ctx); | |
29 | a = BN_CTX_get(ctx); | |
30 | b = BN_CTX_get(ctx); | |
31 | if (!TEST_ptr(c = BN_CTX_get(ctx)) | |
32 | /* 1/1 = 1 */ | |
33 | || !TEST_true(group->meth->field_inv(group, b, BN_value_one(), ctx)) | |
34 | || !TEST_true(BN_is_one(b)) | |
35 | /* (1/a)*a = 1 */ | |
36 | || !TEST_true(BN_pseudo_rand(a, BN_num_bits(group->field) - 1, | |
37 | BN_RAND_TOP_ONE, BN_RAND_BOTTOM_ANY)) | |
38 | || !TEST_true(group->meth->field_inv(group, b, a, ctx)) | |
39 | || (group->meth->field_encode && | |
40 | !TEST_true(group->meth->field_encode(group, a, a, ctx))) | |
41 | || (group->meth->field_encode && | |
42 | !TEST_true(group->meth->field_encode(group, b, b, ctx))) | |
43 | || !TEST_true(group->meth->field_mul(group, c, a, b, ctx)) | |
44 | || (group->meth->field_decode && | |
45 | !TEST_true(group->meth->field_decode(group, c, c, ctx))) | |
46 | || !TEST_true(BN_is_one(c))) | |
47 | goto err; | |
48 | ||
49 | /* 1/0 = error */ | |
50 | BN_zero(a); | |
51 | if (!TEST_false(group->meth->field_inv(group, b, a, ctx)) | |
52 | || !TEST_true(ERR_GET_LIB(ERR_peek_last_error()) == ERR_LIB_EC) | |
53 | || !TEST_true(ERR_GET_REASON(ERR_peek_last_error()) == | |
54 | EC_R_CANNOT_INVERT) | |
55 | /* 1/p = error */ | |
56 | || !TEST_false(group->meth->field_inv(group, b, group->field, ctx)) | |
57 | || !TEST_true(ERR_GET_LIB(ERR_peek_last_error()) == ERR_LIB_EC) | |
58 | || !TEST_true(ERR_GET_REASON(ERR_peek_last_error()) == | |
59 | EC_R_CANNOT_INVERT)) | |
60 | goto err; | |
61 | ||
62 | ERR_clear_error(); | |
63 | ret = 1; | |
64 | err: | |
65 | BN_CTX_end(ctx); | |
66 | return ret; | |
67 | } | |
68 | ||
69 | /* wrapper for group_field_tests for explicit curve params and EC_METHOD */ | |
70 | static int field_tests(const EC_METHOD *meth, const unsigned char *params, | |
71 | int len) | |
72 | { | |
73 | BN_CTX *ctx = NULL; | |
74 | BIGNUM *p = NULL, *a = NULL, *b = NULL; | |
75 | EC_GROUP *group = NULL; | |
76 | int ret = 0; | |
77 | ||
78 | if (!TEST_ptr(ctx = BN_CTX_new())) | |
79 | return 0; | |
80 | ||
81 | BN_CTX_start(ctx); | |
82 | p = BN_CTX_get(ctx); | |
83 | a = BN_CTX_get(ctx); | |
84 | if (!TEST_ptr(b = BN_CTX_get(ctx)) | |
85 | || !TEST_ptr(group = EC_GROUP_new(meth)) | |
86 | || !TEST_true(BN_bin2bn(params, len, p)) | |
87 | || !TEST_true(BN_bin2bn(params + len, len, a)) | |
88 | || !TEST_true(BN_bin2bn(params + 2 * len, len, b)) | |
89 | || !TEST_true(EC_GROUP_set_curve(group, p, a, b, ctx)) | |
90 | || !group_field_tests(group, ctx)) | |
91 | goto err; | |
92 | ret = 1; | |
93 | ||
94 | err: | |
95 | BN_CTX_end(ctx); | |
96 | BN_CTX_free(ctx); | |
97 | if (group != NULL) | |
98 | EC_GROUP_free(group); | |
99 | return ret; | |
100 | } | |
101 | ||
102 | /* NIST prime curve P-256 */ | |
103 | static const unsigned char params_p256[] = { | |
104 | /* p */ | |
105 | 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, | |
106 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, | |
107 | 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, | |
108 | /* a */ | |
109 | 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, | |
110 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, | |
111 | 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFC, | |
112 | /* b */ | |
113 | 0x5A, 0xC6, 0x35, 0xD8, 0xAA, 0x3A, 0x93, 0xE7, 0xB3, 0xEB, 0xBD, 0x55, | |
114 | 0x76, 0x98, 0x86, 0xBC, 0x65, 0x1D, 0x06, 0xB0, 0xCC, 0x53, 0xB0, 0xF6, | |
115 | 0x3B, 0xCE, 0x3C, 0x3E, 0x27, 0xD2, 0x60, 0x4B | |
116 | }; | |
117 | ||
118 | #ifndef OPENSSL_NO_EC2M | |
119 | /* NIST binary curve B-283 */ | |
120 | static const unsigned char params_b283[] = { | |
121 | /* p */ | |
122 | 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
123 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
124 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0xA1, | |
125 | /* a */ | |
126 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
127 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
128 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, | |
129 | /* b */ | |
130 | 0x02, 0x7B, 0x68, 0x0A, 0xC8, 0xB8, 0x59, 0x6D, 0xA5, 0xA4, 0xAF, 0x8A, | |
131 | 0x19, 0xA0, 0x30, 0x3F, 0xCA, 0x97, 0xFD, 0x76, 0x45, 0x30, 0x9F, 0xA2, | |
132 | 0xA5, 0x81, 0x48, 0x5A, 0xF6, 0x26, 0x3E, 0x31, 0x3B, 0x79, 0xA2, 0xF5 | |
133 | }; | |
134 | #endif | |
135 | ||
136 | /* test EC_GFp_simple_method directly */ | |
137 | static int field_tests_ecp_simple(void) | |
138 | { | |
139 | TEST_info("Testing EC_GFp_simple_method()\n"); | |
140 | return field_tests(EC_GFp_simple_method(), params_p256, | |
141 | sizeof(params_p256) / 3); | |
142 | } | |
143 | ||
144 | /* test EC_GFp_mont_method directly */ | |
145 | static int field_tests_ecp_mont(void) | |
146 | { | |
147 | TEST_info("Testing EC_GFp_mont_method()\n"); | |
148 | return field_tests(EC_GFp_mont_method(), params_p256, | |
149 | sizeof(params_p256) / 3); | |
150 | } | |
151 | ||
152 | #ifndef OPENSSL_NO_EC2M | |
153 | /* test EC_GF2m_simple_method directly */ | |
154 | static int field_tests_ec2_simple(void) | |
155 | { | |
156 | TEST_info("Testing EC_GF2m_simple_method()\n"); | |
157 | return field_tests(EC_GF2m_simple_method(), params_b283, | |
158 | sizeof(params_b283) / 3); | |
159 | } | |
160 | #endif | |
161 | ||
162 | /* test default method for a named curve */ | |
163 | static int field_tests_default(int n) | |
164 | { | |
165 | BN_CTX *ctx = NULL; | |
166 | EC_GROUP *group = NULL; | |
167 | int nid = curves[n].nid; | |
168 | int ret = 0; | |
169 | ||
170 | TEST_info("Testing curve %s\n", OBJ_nid2sn(nid)); | |
171 | ||
172 | if (!TEST_ptr(group = EC_GROUP_new_by_curve_name(nid)) | |
173 | || !TEST_ptr(ctx = BN_CTX_new()) | |
174 | || !group_field_tests(group, ctx)) | |
175 | goto err; | |
176 | ||
177 | ret = 1; | |
178 | err: | |
179 | if (group != NULL) | |
180 | EC_GROUP_free(group); | |
181 | if (ctx != NULL) | |
182 | BN_CTX_free(ctx); | |
183 | return ret; | |
184 | } | |
185 | ||
186 | int setup_tests(void) | |
187 | { | |
188 | crv_len = EC_get_builtin_curves(NULL, 0); | |
189 | if (!TEST_ptr(curves = OPENSSL_malloc(sizeof(*curves) * crv_len)) | |
190 | || !TEST_true(EC_get_builtin_curves(curves, crv_len))) | |
191 | return 0; | |
192 | ||
193 | ADD_TEST(field_tests_ecp_simple); | |
194 | ADD_TEST(field_tests_ecp_mont); | |
195 | #ifndef OPENSSL_NO_EC2M | |
196 | ADD_TEST(field_tests_ec2_simple); | |
197 | #endif | |
198 | ADD_ALL_TESTS(field_tests_default, crv_len); | |
199 | return 1; | |
200 | } | |
201 | ||
202 | void cleanup_tests(void) | |
203 | { | |
204 | OPENSSL_free(curves); | |
205 | } |