Line | Count | Source (jump to first uncovered line) |
1 | | /* |
2 | | * Copyright (c) 2018-2022 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 | | #include <openssl/bn.h> |
9 | | #include <openssl/ecdsa.h> |
10 | | #include <openssl/obj_mac.h> |
11 | | |
12 | | #include "fido.h" |
13 | | #include "fido/es256.h" |
14 | | |
15 | | #if OPENSSL_VERSION_NUMBER >= 0x30000000 |
16 | 30 | #define get0_EC_KEY(x) EVP_PKEY_get0_EC_KEY((x)) |
17 | | #else |
18 | | #define get0_EC_KEY(x) EVP_PKEY_get0((x)) |
19 | | #endif |
20 | | |
21 | | static const int es256_nid = NID_X9_62_prime256v1; |
22 | | |
23 | | static int |
24 | | decode_coord(const cbor_item_t *item, void *xy, size_t xy_len) |
25 | 9.66k | { |
26 | 9.66k | if (cbor_isa_bytestring(item) == false || |
27 | 9.66k | cbor_bytestring_is_definite(item) == false || |
28 | 9.66k | cbor_bytestring_length(item) != xy_len) { |
29 | 101 | fido_log_debug("%s: cbor type", __func__); |
30 | 101 | return (-1); |
31 | 101 | } |
32 | | |
33 | 9.56k | memcpy(xy, cbor_bytestring_handle(item), xy_len); |
34 | | |
35 | 9.56k | return (0); |
36 | 9.66k | } |
37 | | |
38 | | static int |
39 | | decode_pubkey_point(const cbor_item_t *key, const cbor_item_t *val, void *arg) |
40 | 24.8k | { |
41 | 24.8k | es256_pk_t *k = arg; |
42 | | |
43 | 24.8k | if (cbor_isa_negint(key) == false || |
44 | 24.8k | cbor_int_get_width(key) != CBOR_INT_8) |
45 | 12.5k | return (0); /* ignore */ |
46 | | |
47 | 12.3k | switch (cbor_get_uint8(key)) { |
48 | 4.93k | case 1: /* x coordinate */ |
49 | 4.93k | return (decode_coord(val, &k->x, sizeof(k->x))); |
50 | 4.73k | case 2: /* y coordinate */ |
51 | 4.73k | return (decode_coord(val, &k->y, sizeof(k->y))); |
52 | 12.3k | } |
53 | | |
54 | 2.64k | return (0); /* ignore */ |
55 | 12.3k | } |
56 | | |
57 | | int |
58 | | es256_pk_decode(const cbor_item_t *item, es256_pk_t *k) |
59 | 5.04k | { |
60 | 5.04k | if (cbor_isa_map(item) == false || |
61 | 5.04k | cbor_map_is_definite(item) == false || |
62 | 5.04k | cbor_map_iter(item, k, decode_pubkey_point) < 0) { |
63 | 173 | fido_log_debug("%s: cbor type", __func__); |
64 | 173 | return (-1); |
65 | 173 | } |
66 | | |
67 | 4.86k | return (0); |
68 | 5.04k | } |
69 | | |
70 | | cbor_item_t * |
71 | | es256_pk_encode(const es256_pk_t *pk, int ecdh) |
72 | 3.08k | { |
73 | 3.08k | cbor_item_t *item = NULL; |
74 | 3.08k | struct cbor_pair argv[5]; |
75 | 3.08k | int alg; |
76 | 3.08k | int ok = -1; |
77 | | |
78 | 3.08k | memset(argv, 0, sizeof(argv)); |
79 | | |
80 | 3.08k | if ((item = cbor_new_definite_map(5)) == NULL) |
81 | 13 | goto fail; |
82 | | |
83 | | /* kty */ |
84 | 3.07k | if ((argv[0].key = cbor_build_uint8(1)) == NULL || |
85 | 3.07k | (argv[0].value = cbor_build_uint8(2)) == NULL || |
86 | 3.07k | !cbor_map_add(item, argv[0])) |
87 | 42 | goto fail; |
88 | | |
89 | | /* |
90 | | * "The COSEAlgorithmIdentifier used is -25 (ECDH-ES + |
91 | | * HKDF-256) although this is NOT the algorithm actually |
92 | | * used. Setting this to a different value may result in |
93 | | * compatibility issues." |
94 | | */ |
95 | 3.03k | if (ecdh) |
96 | 2.97k | alg = COSE_ECDH_ES256; |
97 | 61 | else |
98 | 61 | alg = COSE_ES256; |
99 | | |
100 | | /* alg */ |
101 | 3.03k | if ((argv[1].key = cbor_build_uint8(3)) == NULL || |
102 | 3.03k | (argv[1].value = cbor_build_negint8((uint8_t)(-alg - 1))) == NULL || |
103 | 3.03k | !cbor_map_add(item, argv[1])) |
104 | 44 | goto fail; |
105 | | |
106 | | /* crv */ |
107 | 2.98k | if ((argv[2].key = cbor_build_negint8(0)) == NULL || |
108 | 2.98k | (argv[2].value = cbor_build_uint8(1)) == NULL || |
109 | 2.98k | !cbor_map_add(item, argv[2])) |
110 | 51 | goto fail; |
111 | | |
112 | | /* x */ |
113 | 2.93k | if ((argv[3].key = cbor_build_negint8(1)) == NULL || |
114 | 2.93k | (argv[3].value = cbor_build_bytestring(pk->x, |
115 | 2.92k | sizeof(pk->x))) == NULL || !cbor_map_add(item, argv[3])) |
116 | 46 | goto fail; |
117 | | |
118 | | /* y */ |
119 | 2.89k | if ((argv[4].key = cbor_build_negint8(2)) == NULL || |
120 | 2.89k | (argv[4].value = cbor_build_bytestring(pk->y, |
121 | 2.88k | sizeof(pk->y))) == NULL || !cbor_map_add(item, argv[4])) |
122 | 45 | goto fail; |
123 | | |
124 | 2.84k | ok = 0; |
125 | 3.08k | fail: |
126 | 3.08k | if (ok < 0) { |
127 | 241 | if (item != NULL) { |
128 | 228 | cbor_decref(&item); |
129 | 228 | item = NULL; |
130 | 228 | } |
131 | 241 | } |
132 | | |
133 | 18.5k | for (size_t i = 0; i < 5; i++) { |
134 | 15.4k | if (argv[i].key) |
135 | 14.8k | cbor_decref(&argv[i].key); |
136 | 15.4k | if (argv[i].value) |
137 | 14.7k | cbor_decref(&argv[i].value); |
138 | 15.4k | } |
139 | | |
140 | 3.08k | return (item); |
141 | 2.84k | } |
142 | | |
143 | | es256_sk_t * |
144 | | es256_sk_new(void) |
145 | 7.21k | { |
146 | 7.21k | return (calloc(1, sizeof(es256_sk_t))); |
147 | 7.21k | } |
148 | | |
149 | | void |
150 | | es256_sk_free(es256_sk_t **skp) |
151 | 7.21k | { |
152 | 7.21k | es256_sk_t *sk; |
153 | | |
154 | 7.21k | if (skp == NULL || (sk = *skp) == NULL) |
155 | 31 | return; |
156 | | |
157 | 7.18k | freezero(sk, sizeof(*sk)); |
158 | 7.18k | *skp = NULL; |
159 | 7.18k | } |
160 | | |
161 | | es256_pk_t * |
162 | | es256_pk_new(void) |
163 | 14.2k | { |
164 | 14.2k | return (calloc(1, sizeof(es256_pk_t))); |
165 | 14.2k | } |
166 | | |
167 | | void |
168 | | es256_pk_free(es256_pk_t **pkp) |
169 | 28.8k | { |
170 | 28.8k | es256_pk_t *pk; |
171 | | |
172 | 28.8k | if (pkp == NULL || (pk = *pkp) == NULL) |
173 | 14.6k | return; |
174 | | |
175 | 14.1k | freezero(pk, sizeof(*pk)); |
176 | 14.1k | *pkp = NULL; |
177 | 14.1k | } |
178 | | |
179 | | int |
180 | | es256_pk_from_ptr(es256_pk_t *pk, const void *ptr, size_t len) |
181 | 521 | { |
182 | 521 | const uint8_t *p = ptr; |
183 | 521 | EVP_PKEY *pkey; |
184 | | |
185 | 521 | if (len < sizeof(*pk)) |
186 | 416 | return (FIDO_ERR_INVALID_ARGUMENT); |
187 | | |
188 | 105 | if (len == sizeof(*pk) + 1 && *p == 0x04) |
189 | 2 | memcpy(pk, ++p, sizeof(*pk)); /* uncompressed format */ |
190 | 103 | else |
191 | 103 | memcpy(pk, ptr, sizeof(*pk)); /* libfido2 x||y format */ |
192 | | |
193 | 105 | if ((pkey = es256_pk_to_EVP_PKEY(pk)) == NULL) { |
194 | 73 | fido_log_debug("%s: es256_pk_to_EVP_PKEY", __func__); |
195 | 73 | explicit_bzero(pk, sizeof(*pk)); |
196 | 73 | return (FIDO_ERR_INVALID_ARGUMENT); |
197 | 73 | } |
198 | | |
199 | 32 | EVP_PKEY_free(pkey); |
200 | | |
201 | 32 | return (FIDO_OK); |
202 | 105 | } |
203 | | |
204 | | int |
205 | | es256_pk_set_x(es256_pk_t *pk, const unsigned char *x) |
206 | 61 | { |
207 | 61 | memcpy(pk->x, x, sizeof(pk->x)); |
208 | | |
209 | 61 | return (0); |
210 | 61 | } |
211 | | |
212 | | int |
213 | | es256_pk_set_y(es256_pk_t *pk, const unsigned char *y) |
214 | 61 | { |
215 | 61 | memcpy(pk->y, y, sizeof(pk->y)); |
216 | | |
217 | 61 | return (0); |
218 | 61 | } |
219 | | |
220 | | int |
221 | | es256_sk_create(es256_sk_t *key) |
222 | 7.15k | { |
223 | 7.15k | EVP_PKEY_CTX *pctx = NULL; |
224 | 7.15k | EVP_PKEY_CTX *kctx = NULL; |
225 | 7.15k | EVP_PKEY *p = NULL; |
226 | 7.15k | EVP_PKEY *k = NULL; |
227 | 7.15k | const EC_KEY *ec; |
228 | 7.15k | const BIGNUM *d; |
229 | 7.15k | int n; |
230 | 7.15k | int ok = -1; |
231 | | |
232 | 7.15k | if ((pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_EC, NULL)) == NULL || |
233 | 7.15k | EVP_PKEY_paramgen_init(pctx) <= 0 || |
234 | 7.15k | EVP_PKEY_CTX_set_ec_paramgen_curve_nid(pctx, es256_nid) <= 0 || |
235 | 7.15k | EVP_PKEY_paramgen(pctx, &p) <= 0) { |
236 | 102 | fido_log_debug("%s: EVP_PKEY_paramgen", __func__); |
237 | 102 | goto fail; |
238 | 102 | } |
239 | | |
240 | 7.05k | if ((kctx = EVP_PKEY_CTX_new(p, NULL)) == NULL || |
241 | 7.05k | EVP_PKEY_keygen_init(kctx) <= 0 || EVP_PKEY_keygen(kctx, &k) <= 0) { |
242 | 101 | fido_log_debug("%s: EVP_PKEY_keygen", __func__); |
243 | 101 | goto fail; |
244 | 101 | } |
245 | | |
246 | 6.95k | if ((ec = EVP_PKEY_get0_EC_KEY(k)) == NULL || |
247 | 6.95k | (d = EC_KEY_get0_private_key(ec)) == NULL || |
248 | 6.95k | (n = BN_num_bytes(d)) < 0 || (size_t)n > sizeof(key->d) || |
249 | 6.95k | (n = BN_bn2bin(d, key->d)) < 0 || (size_t)n > sizeof(key->d)) { |
250 | 118 | fido_log_debug("%s: EC_KEY_get0_private_key", __func__); |
251 | 118 | goto fail; |
252 | 118 | } |
253 | | |
254 | 6.83k | ok = 0; |
255 | 7.15k | fail: |
256 | 7.15k | if (p != NULL) |
257 | 7.05k | EVP_PKEY_free(p); |
258 | 7.15k | if (k != NULL) |
259 | 6.95k | EVP_PKEY_free(k); |
260 | 7.15k | if (pctx != NULL) |
261 | 7.11k | EVP_PKEY_CTX_free(pctx); |
262 | 7.15k | if (kctx != NULL) |
263 | 7.01k | EVP_PKEY_CTX_free(kctx); |
264 | | |
265 | 7.15k | return (ok); |
266 | 6.83k | } |
267 | | |
268 | | EVP_PKEY * |
269 | | es256_pk_to_EVP_PKEY(const es256_pk_t *k) |
270 | 4.60k | { |
271 | 4.60k | BN_CTX *bnctx = NULL; |
272 | 4.60k | EC_KEY *ec = NULL; |
273 | 4.60k | EC_POINT *q = NULL; |
274 | 4.60k | EVP_PKEY *pkey = NULL; |
275 | 4.60k | BIGNUM *x = NULL; |
276 | 4.60k | BIGNUM *y = NULL; |
277 | 4.60k | const EC_GROUP *g = NULL; |
278 | 4.60k | int ok = -1; |
279 | | |
280 | 4.60k | if ((bnctx = BN_CTX_new()) == NULL) |
281 | 23 | goto fail; |
282 | | |
283 | 4.58k | BN_CTX_start(bnctx); |
284 | | |
285 | 4.58k | if ((x = BN_CTX_get(bnctx)) == NULL || |
286 | 4.58k | (y = BN_CTX_get(bnctx)) == NULL) |
287 | 46 | goto fail; |
288 | | |
289 | 4.53k | if (BN_bin2bn(k->x, sizeof(k->x), x) == NULL || |
290 | 4.53k | BN_bin2bn(k->y, sizeof(k->y), y) == NULL) { |
291 | 64 | fido_log_debug("%s: BN_bin2bn", __func__); |
292 | 64 | goto fail; |
293 | 64 | } |
294 | | |
295 | 4.47k | if ((ec = EC_KEY_new_by_curve_name(es256_nid)) == NULL || |
296 | 4.47k | (g = EC_KEY_get0_group(ec)) == NULL) { |
297 | 43 | fido_log_debug("%s: EC_KEY init", __func__); |
298 | 43 | goto fail; |
299 | 43 | } |
300 | | |
301 | 4.42k | if ((q = EC_POINT_new(g)) == NULL || |
302 | 4.42k | EC_POINT_set_affine_coordinates_GFp(g, q, x, y, bnctx) == 0 || |
303 | 4.42k | EC_KEY_set_public_key(ec, q) == 0) { |
304 | 660 | fido_log_debug("%s: EC_KEY_set_public_key", __func__); |
305 | 660 | goto fail; |
306 | 660 | } |
307 | | |
308 | 3.76k | if ((pkey = EVP_PKEY_new()) == NULL || |
309 | 3.76k | EVP_PKEY_assign_EC_KEY(pkey, ec) == 0) { |
310 | 37 | fido_log_debug("%s: EVP_PKEY_assign_EC_KEY", __func__); |
311 | 37 | goto fail; |
312 | 37 | } |
313 | | |
314 | 3.73k | ec = NULL; /* at this point, ec belongs to evp */ |
315 | | |
316 | 3.73k | ok = 0; |
317 | 4.60k | fail: |
318 | 4.60k | if (bnctx != NULL) { |
319 | 4.58k | BN_CTX_end(bnctx); |
320 | 4.58k | BN_CTX_free(bnctx); |
321 | 4.58k | } |
322 | | |
323 | 4.60k | if (ec != NULL) |
324 | 714 | EC_KEY_free(ec); |
325 | 4.60k | if (q != NULL) |
326 | 4.40k | EC_POINT_free(q); |
327 | | |
328 | 4.60k | if (ok < 0 && pkey != NULL) { |
329 | 25 | EVP_PKEY_free(pkey); |
330 | 25 | pkey = NULL; |
331 | 25 | } |
332 | | |
333 | 4.60k | return (pkey); |
334 | 3.73k | } |
335 | | |
336 | | int |
337 | | es256_pk_from_EC_KEY(es256_pk_t *pk, const EC_KEY *ec) |
338 | 6.70k | { |
339 | 6.70k | BN_CTX *bnctx = NULL; |
340 | 6.70k | BIGNUM *x = NULL; |
341 | 6.70k | BIGNUM *y = NULL; |
342 | 6.70k | const EC_POINT *q = NULL; |
343 | 6.70k | EC_GROUP *g = NULL; |
344 | 6.70k | size_t dx; |
345 | 6.70k | size_t dy; |
346 | 6.70k | int ok = FIDO_ERR_INTERNAL; |
347 | 6.70k | int nx; |
348 | 6.70k | int ny; |
349 | | |
350 | 6.70k | if ((q = EC_KEY_get0_public_key(ec)) == NULL || |
351 | 6.70k | (g = EC_GROUP_new_by_curve_name(es256_nid)) == NULL || |
352 | 6.70k | (bnctx = BN_CTX_new()) == NULL) |
353 | 46 | goto fail; |
354 | | |
355 | 6.66k | BN_CTX_start(bnctx); |
356 | | |
357 | 6.66k | if ((x = BN_CTX_get(bnctx)) == NULL || |
358 | 6.66k | (y = BN_CTX_get(bnctx)) == NULL) |
359 | 74 | goto fail; |
360 | | |
361 | 6.58k | if (EC_POINT_is_on_curve(g, q, bnctx) != 1) { |
362 | 0 | fido_log_debug("%s: EC_POINT_is_on_curve", __func__); |
363 | 0 | ok = FIDO_ERR_INVALID_ARGUMENT; |
364 | 0 | goto fail; |
365 | 0 | } |
366 | | |
367 | 6.58k | if (EC_POINT_get_affine_coordinates_GFp(g, q, x, y, bnctx) == 0 || |
368 | 6.58k | (nx = BN_num_bytes(x)) < 0 || (size_t)nx > sizeof(pk->x) || |
369 | 6.58k | (ny = BN_num_bytes(y)) < 0 || (size_t)ny > sizeof(pk->y)) { |
370 | 34 | fido_log_debug("%s: EC_POINT_get_affine_coordinates_GFp", |
371 | 34 | __func__); |
372 | 34 | goto fail; |
373 | 34 | } |
374 | | |
375 | 6.55k | dx = sizeof(pk->x) - (size_t)nx; |
376 | 6.55k | dy = sizeof(pk->y) - (size_t)ny; |
377 | | |
378 | 6.55k | if ((nx = BN_bn2bin(x, pk->x + dx)) < 0 || (size_t)nx > sizeof(pk->x) || |
379 | 6.55k | (ny = BN_bn2bin(y, pk->y + dy)) < 0 || (size_t)ny > sizeof(pk->y)) { |
380 | 80 | fido_log_debug("%s: BN_bn2bin", __func__); |
381 | 80 | goto fail; |
382 | 80 | } |
383 | | |
384 | 6.47k | ok = FIDO_OK; |
385 | 6.70k | fail: |
386 | 6.70k | EC_GROUP_free(g); |
387 | | |
388 | 6.70k | if (bnctx != NULL) { |
389 | 6.66k | BN_CTX_end(bnctx); |
390 | 6.66k | BN_CTX_free(bnctx); |
391 | 6.66k | } |
392 | | |
393 | 6.70k | return (ok); |
394 | 6.47k | } |
395 | | |
396 | | int |
397 | | es256_pk_from_EVP_PKEY(es256_pk_t *pk, const EVP_PKEY *pkey) |
398 | 30 | { |
399 | 30 | const EC_KEY *ec; |
400 | | |
401 | 30 | if (EVP_PKEY_base_id(pkey) != EVP_PKEY_EC || |
402 | 30 | (ec = get0_EC_KEY(pkey)) == NULL) |
403 | 3 | return (FIDO_ERR_INVALID_ARGUMENT); |
404 | | |
405 | 27 | return (es256_pk_from_EC_KEY(pk, ec)); |
406 | 30 | } |
407 | | |
408 | | EVP_PKEY * |
409 | | es256_sk_to_EVP_PKEY(const es256_sk_t *k) |
410 | 3.64k | { |
411 | 3.64k | BN_CTX *bnctx = NULL; |
412 | 3.64k | EC_KEY *ec = NULL; |
413 | 3.64k | EVP_PKEY *pkey = NULL; |
414 | 3.64k | BIGNUM *d = NULL; |
415 | 3.64k | int ok = -1; |
416 | | |
417 | 3.64k | if ((bnctx = BN_CTX_new()) == NULL) |
418 | 12 | goto fail; |
419 | | |
420 | 3.63k | BN_CTX_start(bnctx); |
421 | | |
422 | 3.63k | if ((d = BN_CTX_get(bnctx)) == NULL || |
423 | 3.63k | BN_bin2bn(k->d, sizeof(k->d), d) == NULL) { |
424 | 30 | fido_log_debug("%s: BN_bin2bn", __func__); |
425 | 30 | goto fail; |
426 | 30 | } |
427 | | |
428 | 3.60k | if ((ec = EC_KEY_new_by_curve_name(es256_nid)) == NULL || |
429 | 3.60k | EC_KEY_set_private_key(ec, d) == 0) { |
430 | 16 | fido_log_debug("%s: EC_KEY_set_private_key", __func__); |
431 | 16 | goto fail; |
432 | 16 | } |
433 | | |
434 | 3.58k | if ((pkey = EVP_PKEY_new()) == NULL || |
435 | 3.58k | EVP_PKEY_assign_EC_KEY(pkey, ec) == 0) { |
436 | 33 | fido_log_debug("%s: EVP_PKEY_assign_EC_KEY", __func__); |
437 | 33 | goto fail; |
438 | 33 | } |
439 | | |
440 | 3.55k | ec = NULL; /* at this point, ec belongs to evp */ |
441 | | |
442 | 3.55k | ok = 0; |
443 | 3.64k | fail: |
444 | 3.64k | if (bnctx != NULL) { |
445 | 3.63k | BN_CTX_end(bnctx); |
446 | 3.63k | BN_CTX_free(bnctx); |
447 | 3.63k | } |
448 | | |
449 | 3.64k | if (ec != NULL) |
450 | 33 | EC_KEY_free(ec); |
451 | | |
452 | 3.64k | if (ok < 0 && pkey != NULL) { |
453 | 19 | EVP_PKEY_free(pkey); |
454 | 19 | pkey = NULL; |
455 | 19 | } |
456 | | |
457 | 3.64k | return (pkey); |
458 | 3.55k | } |
459 | | |
460 | | int |
461 | | es256_derive_pk(const es256_sk_t *sk, es256_pk_t *pk) |
462 | 6.83k | { |
463 | 6.83k | BIGNUM *d = NULL; |
464 | 6.83k | EC_KEY *ec = NULL; |
465 | 6.83k | EC_POINT *q = NULL; |
466 | 6.83k | const EC_GROUP *g = NULL; |
467 | 6.83k | int ok = -1; |
468 | | |
469 | 6.83k | if ((d = BN_bin2bn(sk->d, (int)sizeof(sk->d), NULL)) == NULL || |
470 | 6.83k | (ec = EC_KEY_new_by_curve_name(es256_nid)) == NULL || |
471 | 6.83k | (g = EC_KEY_get0_group(ec)) == NULL || |
472 | 6.83k | (q = EC_POINT_new(g)) == NULL) { |
473 | 151 | fido_log_debug("%s: get", __func__); |
474 | 151 | goto fail; |
475 | 151 | } |
476 | | |
477 | 6.68k | if (EC_POINT_mul(g, q, d, NULL, NULL, NULL) == 0 || |
478 | 6.68k | EC_KEY_set_public_key(ec, q) == 0 || |
479 | 6.68k | es256_pk_from_EC_KEY(pk, ec) != FIDO_OK) { |
480 | 226 | fido_log_debug("%s: set", __func__); |
481 | 226 | goto fail; |
482 | 226 | } |
483 | | |
484 | 6.45k | ok = 0; |
485 | 6.83k | fail: |
486 | 6.83k | if (d != NULL) |
487 | 6.79k | BN_clear_free(d); |
488 | 6.83k | if (q != NULL) |
489 | 6.68k | EC_POINT_free(q); |
490 | 6.83k | if (ec != NULL) |
491 | 6.75k | EC_KEY_free(ec); |
492 | | |
493 | 6.83k | return (ok); |
494 | 6.45k | } |
495 | | |
496 | | int |
497 | | es256_verify_sig(const fido_blob_t *dgst, EVP_PKEY *pkey, |
498 | | const fido_blob_t *sig) |
499 | 44 | { |
500 | 44 | EVP_PKEY_CTX *pctx = NULL; |
501 | 44 | int ok = -1; |
502 | | |
503 | 44 | if (EVP_PKEY_base_id(pkey) != EVP_PKEY_EC) { |
504 | 0 | fido_log_debug("%s: EVP_PKEY_base_id", __func__); |
505 | 0 | goto fail; |
506 | 0 | } |
507 | | |
508 | 44 | if ((pctx = EVP_PKEY_CTX_new(pkey, NULL)) == NULL || |
509 | 44 | EVP_PKEY_verify_init(pctx) != 1 || |
510 | 44 | EVP_PKEY_verify(pctx, sig->ptr, sig->len, dgst->ptr, |
511 | 44 | dgst->len) != 1) { |
512 | 44 | fido_log_debug("%s: EVP_PKEY_verify", __func__); |
513 | 44 | goto fail; |
514 | 44 | } |
515 | | |
516 | 0 | ok = 0; |
517 | 44 | fail: |
518 | 44 | EVP_PKEY_CTX_free(pctx); |
519 | | |
520 | 44 | return (ok); |
521 | 0 | } |
522 | | |
523 | | int |
524 | | es256_pk_verify_sig(const fido_blob_t *dgst, const es256_pk_t *pk, |
525 | | const fido_blob_t *sig) |
526 | 58 | { |
527 | 58 | EVP_PKEY *pkey; |
528 | 58 | int ok = -1; |
529 | | |
530 | 58 | if ((pkey = es256_pk_to_EVP_PKEY(pk)) == NULL || |
531 | 58 | es256_verify_sig(dgst, pkey, sig) < 0) { |
532 | 58 | fido_log_debug("%s: es256_verify_sig", __func__); |
533 | 58 | goto fail; |
534 | 58 | } |
535 | | |
536 | 0 | ok = 0; |
537 | 58 | fail: |
538 | 58 | EVP_PKEY_free(pkey); |
539 | | |
540 | 58 | return (ok); |
541 | 0 | } |