1 /*
2 * Copyright (c) 2022 Yubico AB. All rights reserved.
3 * Use of this source code is governed by a BSD-style
4 * license that can be found in the LICENSE file.
5 * SPDX-License-Identifier: BSD-2-Clause
6 */
7
8 #undef NDEBUG
9
10 #include <assert.h>
11 #include <string.h>
12
13 #define _FIDO_INTERNAL
14
15 #include <fido.h>
16 #include <fido/es256.h>
17
18 #include <openssl/bio.h>
19 #include <openssl/pem.h>
20
21 #define ASSERT_NOT_NULL(e) assert((e) != NULL)
22 #define ASSERT_NULL(e) assert((e) == NULL)
23 #define ASSERT_INVAL(e) assert((e) == FIDO_ERR_INVALID_ARGUMENT)
24 #define ASSERT_OK(e) assert((e) == FIDO_OK)
25
26 static const char short_x[] = \
27 "-----BEGIN PUBLIC KEY-----\n"
28 "MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEAAeeHTZj4LEbt7Czs+u5gEZJfnGE\n"
29 "6Z+YLe4AYu7SoGY7IH/2jKifsA7w+lkURL4DL63oEjd3f8foH9bX4eaVug==\n"
30 "-----END PUBLIC KEY-----";
31
32 static const char short_y[] = \
33 "-----BEGIN PUBLIC KEY-----\n"
34 "MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEL8CWUP1r0tpJ5QmkzLc69O74C/Ti\n"
35 "83hTiys/JFNVkp0ArW3pKt5jNRrgWSZYE4S/D3AMtpqifFXz/FLCzJqojQ==\n"
36 "-----END PUBLIC KEY-----\n";
37
38 static const char p256k1[] = \
39 "-----BEGIN PUBLIC KEY-----\n"
40 "MFYwEAYHKoZIzj0CAQYFK4EEAAoDQgAEU1y8c0Jg9FGr3vYChpEo9c4dpkijriYM\n"
41 "QzU/DeskC89hZjLNH1Sj8ra2MsBlVGGJTNPCZSyx8Jo7ERapxdN7UQ==\n"
42 "-----END PUBLIC KEY-----\n";
43
44 static const char p256v1[] = \
45 "-----BEGIN PUBLIC KEY-----\n"
46 "MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEOwiq14c80b7C1Jzsx5w1zMvk2GgW\n"
47 "5kfGMOKXjwF/U+51ZfBDKehs3ivdeXAJBkxIh7E3iA32s+HyNqk+ntl9fg==\n"
48 "-----END PUBLIC KEY-----\n";
49
50 static const unsigned char p256k1_raw[] = {
51 0x04, 0x53, 0x5c, 0xbc, 0x73, 0x42, 0x60, 0xf4,
52 0x51, 0xab, 0xde, 0xf6, 0x02, 0x86, 0x91, 0x28,
53 0xf5, 0xce, 0x1d, 0xa6, 0x48, 0xa3, 0xae, 0x26,
54 0x0c, 0x43, 0x35, 0x3f, 0x0d, 0xeb, 0x24, 0x0b,
55 0xcf, 0x61, 0x66, 0x32, 0xcd, 0x1f, 0x54, 0xa3,
56 0xf2, 0xb6, 0xb6, 0x32, 0xc0, 0x65, 0x54, 0x61,
57 0x89, 0x4c, 0xd3, 0xc2, 0x65, 0x2c, 0xb1, 0xf0,
58 0x9a, 0x3b, 0x11, 0x16, 0xa9, 0xc5, 0xd3, 0x7b,
59 0x51,
60 };
61
62 static const unsigned char p256v1_raw[] = {
63 0x04, 0x3b, 0x08, 0xaa, 0xd7, 0x87, 0x3c, 0xd1,
64 0xbe, 0xc2, 0xd4, 0x9c, 0xec, 0xc7, 0x9c, 0x35,
65 0xcc, 0xcb, 0xe4, 0xd8, 0x68, 0x16, 0xe6, 0x47,
66 0xc6, 0x30, 0xe2, 0x97, 0x8f, 0x01, 0x7f, 0x53,
67 0xee, 0x75, 0x65, 0xf0, 0x43, 0x29, 0xe8, 0x6c,
68 0xde, 0x2b, 0xdd, 0x79, 0x70, 0x09, 0x06, 0x4c,
69 0x48, 0x87, 0xb1, 0x37, 0x88, 0x0d, 0xf6, 0xb3,
70 0xe1, 0xf2, 0x36, 0xa9, 0x3e, 0x9e, 0xd9, 0x7d,
71 0x7e,
72 };
73
74 static EVP_PKEY *
EVP_PKEY_from_PEM(const char * ptr,size_t len)75 EVP_PKEY_from_PEM(const char *ptr, size_t len)
76 {
77 BIO *bio = NULL;
78 EVP_PKEY *pkey = NULL;
79
80 if ((bio = BIO_new(BIO_s_mem())) == NULL) {
81 warnx("BIO_new");
82 goto out;
83 }
84 if (len > INT_MAX || BIO_write(bio, ptr, (int)len) != (int)len) {
85 warnx("BIO_write");
86 goto out;
87 }
88 if ((pkey = PEM_read_bio_PUBKEY(bio, NULL, NULL, NULL)) == NULL)
89 warnx("PEM_read_bio_PUBKEY");
90 out:
91 BIO_free(bio);
92
93 return pkey;
94 }
95
96 static int
es256_pk_cmp(const char * ptr,size_t len)97 es256_pk_cmp(const char *ptr, size_t len)
98 {
99 EVP_PKEY *pkA = NULL;
100 EVP_PKEY *pkB = NULL;
101 es256_pk_t *k = NULL;
102 int r, ok = -1;
103
104 if ((pkA = EVP_PKEY_from_PEM(ptr, len)) == NULL) {
105 warnx("EVP_PKEY_from_PEM");
106 goto out;
107 }
108 if ((k = es256_pk_new()) == NULL) {
109 warnx("es256_pk_new");
110 goto out;
111 }
112 if ((r = es256_pk_from_EVP_PKEY(k, pkA)) != FIDO_OK) {
113 warnx("es256_pk_from_EVP_PKEY: 0x%x", r);
114 goto out;
115 }
116 if ((pkB = es256_pk_to_EVP_PKEY(k)) == NULL) {
117 warnx("es256_pk_to_EVP_PKEY");
118 goto out;
119 }
120 if ((r = EVP_PKEY_cmp(pkA, pkB)) != 1) {
121 warnx("EVP_PKEY_cmp: %d", r);
122 goto out;
123 }
124
125 ok = 0;
126 out:
127 EVP_PKEY_free(pkA);
128 EVP_PKEY_free(pkB);
129 es256_pk_free(&k);
130
131 return ok;
132 }
133
134 static void
short_coord(void)135 short_coord(void)
136 {
137 assert(es256_pk_cmp(short_x, sizeof(short_x)) == 0);
138 assert(es256_pk_cmp(short_y, sizeof(short_y)) == 0);
139 }
140
141 static void
invalid_curve(const unsigned char * raw,size_t raw_len)142 invalid_curve(const unsigned char *raw, size_t raw_len)
143 {
144 EVP_PKEY *pkey;
145 es256_pk_t *pk;
146
147 ASSERT_NOT_NULL((pkey = EVP_PKEY_from_PEM(p256k1, sizeof(p256k1))));
148 ASSERT_NOT_NULL((pk = es256_pk_new()));
149 ASSERT_INVAL(es256_pk_from_EVP_PKEY(pk, pkey));
150 ASSERT_INVAL(es256_pk_from_ptr(pk, raw, raw_len));
151 ASSERT_NULL(es256_pk_to_EVP_PKEY((const es256_pk_t *)raw));
152
153 EVP_PKEY_free(pkey);
154 es256_pk_free(&pk);
155 }
156
157 static void
full_coord(void)158 full_coord(void)
159 {
160 assert(es256_pk_cmp(p256v1, sizeof(p256v1)) == 0);
161 }
162
163 static void
valid_curve(const unsigned char * raw,size_t raw_len)164 valid_curve(const unsigned char *raw, size_t raw_len)
165 {
166 EVP_PKEY *pkeyA;
167 EVP_PKEY *pkeyB;
168 es256_pk_t *pkA;
169 es256_pk_t *pkB;
170
171 ASSERT_NOT_NULL((pkeyA = EVP_PKEY_from_PEM(p256v1, sizeof(p256v1))));
172 ASSERT_NOT_NULL((pkA = es256_pk_new()));
173 ASSERT_NOT_NULL((pkB = es256_pk_new()));
174 ASSERT_OK(es256_pk_from_EVP_PKEY(pkA, pkeyA));
175 ASSERT_OK(es256_pk_from_ptr(pkB, raw, raw_len));
176 ASSERT_NOT_NULL((pkeyB = es256_pk_to_EVP_PKEY(pkB)));
177 assert(EVP_PKEY_cmp(pkeyA, pkeyB) == 1);
178
179 EVP_PKEY_free(pkeyA);
180 EVP_PKEY_free(pkeyB);
181 es256_pk_free(&pkA);
182 es256_pk_free(&pkB);
183 }
184
185 int
main(void)186 main(void)
187 {
188 fido_init(0);
189
190 short_coord();
191 full_coord();
192
193 invalid_curve(p256k1_raw, sizeof(p256k1_raw)); /* uncompressed */
194 invalid_curve(p256k1_raw + 1, sizeof(p256k1_raw) - 1); /* libfido2 */
195 valid_curve(p256v1_raw, sizeof(p256v1_raw)); /* uncompressed */
196 valid_curve(p256v1_raw + 1, sizeof(p256v1_raw) - 1); /* libfido2 */
197
198 exit(0);
199 }
200