1 /*
2 * Copyright 2019-2024 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 /*
11 * DH low level APIs are deprecated for public use, but still ok for
12 * internal use.
13 */
14 #include "internal/deprecated.h"
15 #include "internal/common.h"
16
17 #include <string.h> /* strcmp */
18 #include <openssl/core_dispatch.h>
19 #include <openssl/core_names.h>
20 #include <openssl/bn.h>
21 #include <openssl/err.h>
22 #include "prov/implementations.h"
23 #include "prov/providercommon.h"
24 #include "prov/provider_ctx.h"
25 #include "crypto/dh.h"
26 #include "internal/sizes.h"
27
28 static OSSL_FUNC_keymgmt_new_fn dh_newdata;
29 static OSSL_FUNC_keymgmt_free_fn dh_freedata;
30 static OSSL_FUNC_keymgmt_gen_init_fn dh_gen_init;
31 static OSSL_FUNC_keymgmt_gen_init_fn dhx_gen_init;
32 static OSSL_FUNC_keymgmt_gen_set_template_fn dh_gen_set_template;
33 static OSSL_FUNC_keymgmt_gen_set_params_fn dh_gen_set_params;
34 static OSSL_FUNC_keymgmt_gen_settable_params_fn dh_gen_settable_params;
35 static OSSL_FUNC_keymgmt_gen_fn dh_gen;
36 static OSSL_FUNC_keymgmt_gen_cleanup_fn dh_gen_cleanup;
37 static OSSL_FUNC_keymgmt_load_fn dh_load;
38 static OSSL_FUNC_keymgmt_get_params_fn dh_get_params;
39 static OSSL_FUNC_keymgmt_gettable_params_fn dh_gettable_params;
40 static OSSL_FUNC_keymgmt_set_params_fn dh_set_params;
41 static OSSL_FUNC_keymgmt_settable_params_fn dh_settable_params;
42 static OSSL_FUNC_keymgmt_has_fn dh_has;
43 static OSSL_FUNC_keymgmt_match_fn dh_match;
44 static OSSL_FUNC_keymgmt_validate_fn dh_validate;
45 static OSSL_FUNC_keymgmt_import_fn dh_import;
46 static OSSL_FUNC_keymgmt_import_types_fn dh_import_types;
47 static OSSL_FUNC_keymgmt_export_fn dh_export;
48 static OSSL_FUNC_keymgmt_export_types_fn dh_export_types;
49 static OSSL_FUNC_keymgmt_dup_fn dh_dup;
50
51 #define DH_POSSIBLE_SELECTIONS \
52 (OSSL_KEYMGMT_SELECT_KEYPAIR | OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS)
53
54 struct dh_gen_ctx {
55 OSSL_LIB_CTX *libctx;
56
57 FFC_PARAMS *ffc_params;
58 int selection;
59 /* All these parameters are used for parameter generation only */
60 /* If there is a group name then the remaining parameters are not needed */
61 int group_nid;
62 size_t pbits;
63 size_t qbits;
64 unsigned char *seed; /* optional FIPS186-4 param for testing */
65 size_t seedlen;
66 int gindex; /* optional FIPS186-4 generator index (ignored if -1) */
67 int gen_type; /* see dhtype2id */
68 int generator; /* Used by DH_PARAMGEN_TYPE_GENERATOR in non fips mode only */
69 int pcounter;
70 int hindex;
71 int priv_len;
72
73 char *mdname;
74 char *mdprops;
75 OSSL_CALLBACK *cb;
76 void *cbarg;
77 int dh_type;
78 };
79
dh_gen_type_name2id_w_default(const char * name,int type)80 static int dh_gen_type_name2id_w_default(const char *name, int type)
81 {
82 if (strcmp(name, "default") == 0) {
83 #ifdef FIPS_MODULE
84 if (type == DH_FLAG_TYPE_DHX)
85 return DH_PARAMGEN_TYPE_FIPS_186_4;
86
87 return DH_PARAMGEN_TYPE_GROUP;
88 #else
89 if (type == DH_FLAG_TYPE_DHX)
90 return DH_PARAMGEN_TYPE_FIPS_186_2;
91
92 return DH_PARAMGEN_TYPE_GENERATOR;
93 #endif
94 }
95
96 return ossl_dh_gen_type_name2id(name, type);
97 }
98
dh_newdata(void * provctx)99 static void *dh_newdata(void *provctx)
100 {
101 DH *dh = NULL;
102
103 if (ossl_prov_is_running()) {
104 dh = ossl_dh_new_ex(PROV_LIBCTX_OF(provctx));
105 if (dh != NULL) {
106 DH_clear_flags(dh, DH_FLAG_TYPE_MASK);
107 DH_set_flags(dh, DH_FLAG_TYPE_DH);
108 }
109 }
110 return dh;
111 }
112
dhx_newdata(void * provctx)113 static void *dhx_newdata(void *provctx)
114 {
115 DH *dh = NULL;
116
117 dh = ossl_dh_new_ex(PROV_LIBCTX_OF(provctx));
118 if (dh != NULL) {
119 DH_clear_flags(dh, DH_FLAG_TYPE_MASK);
120 DH_set_flags(dh, DH_FLAG_TYPE_DHX);
121 }
122 return dh;
123 }
124
dh_freedata(void * keydata)125 static void dh_freedata(void *keydata)
126 {
127 DH_free(keydata);
128 }
129
dh_has(const void * keydata,int selection)130 static int dh_has(const void *keydata, int selection)
131 {
132 const DH *dh = keydata;
133 int ok = 1;
134
135 if (!ossl_prov_is_running() || dh == NULL)
136 return 0;
137 if ((selection & DH_POSSIBLE_SELECTIONS) == 0)
138 return 1; /* the selection is not missing */
139
140 if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
141 ok = ok && (DH_get0_pub_key(dh) != NULL);
142 if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
143 ok = ok && (DH_get0_priv_key(dh) != NULL);
144 if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
145 ok = ok && (DH_get0_p(dh) != NULL && DH_get0_g(dh) != NULL);
146 return ok;
147 }
148
dh_match(const void * keydata1,const void * keydata2,int selection)149 static int dh_match(const void *keydata1, const void *keydata2, int selection)
150 {
151 const DH *dh1 = keydata1;
152 const DH *dh2 = keydata2;
153 int ok = 1;
154
155 if (!ossl_prov_is_running())
156 return 0;
157
158 if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0) {
159 int key_checked = 0;
160
161 if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0) {
162 const BIGNUM *pa = DH_get0_pub_key(dh1);
163 const BIGNUM *pb = DH_get0_pub_key(dh2);
164
165 if (pa != NULL && pb != NULL) {
166 ok = ok && BN_cmp(pa, pb) == 0;
167 key_checked = 1;
168 }
169 }
170 if (!key_checked
171 && (selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0) {
172 const BIGNUM *pa = DH_get0_priv_key(dh1);
173 const BIGNUM *pb = DH_get0_priv_key(dh2);
174
175 if (pa != NULL && pb != NULL) {
176 ok = ok && BN_cmp(pa, pb) == 0;
177 key_checked = 1;
178 }
179 }
180 ok = ok && key_checked;
181 }
182 if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0) {
183 FFC_PARAMS *dhparams1 = ossl_dh_get0_params((DH *)dh1);
184 FFC_PARAMS *dhparams2 = ossl_dh_get0_params((DH *)dh2);
185
186 ok = ok && ossl_ffc_params_cmp(dhparams1, dhparams2, 1);
187 }
188 return ok;
189 }
190
dh_import(void * keydata,int selection,const OSSL_PARAM params[])191 static int dh_import(void *keydata, int selection, const OSSL_PARAM params[])
192 {
193 DH *dh = keydata;
194 int ok = 1;
195
196 if (!ossl_prov_is_running() || dh == NULL)
197 return 0;
198
199 if ((selection & DH_POSSIBLE_SELECTIONS) == 0)
200 return 0;
201
202 /* a key without parameters is meaningless */
203 ok = ok && ossl_dh_params_fromdata(dh, params);
204
205 if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0) {
206 int include_private =
207 selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY ? 1 : 0;
208
209 ok = ok && ossl_dh_key_fromdata(dh, params, include_private);
210 }
211
212 return ok;
213 }
214
dh_export(void * keydata,int selection,OSSL_CALLBACK * param_cb,void * cbarg)215 static int dh_export(void *keydata, int selection, OSSL_CALLBACK *param_cb,
216 void *cbarg)
217 {
218 DH *dh = keydata;
219 OSSL_PARAM_BLD *tmpl = NULL;
220 OSSL_PARAM *params = NULL;
221 int ok = 1;
222
223 if (!ossl_prov_is_running() || dh == NULL)
224 return 0;
225
226 if ((selection & DH_POSSIBLE_SELECTIONS) == 0)
227 return 0;
228
229 tmpl = OSSL_PARAM_BLD_new();
230 if (tmpl == NULL)
231 return 0;
232
233 if ((selection & OSSL_KEYMGMT_SELECT_ALL_PARAMETERS) != 0)
234 ok = ok && ossl_dh_params_todata(dh, tmpl, NULL);
235
236 if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0) {
237 int include_private =
238 selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY ? 1 : 0;
239
240 ok = ok && ossl_dh_key_todata(dh, tmpl, NULL, include_private);
241 }
242
243 if (!ok || (params = OSSL_PARAM_BLD_to_param(tmpl)) == NULL) {
244 ok = 0;
245 goto err;
246 }
247
248 ok = param_cb(params, cbarg);
249 OSSL_PARAM_free(params);
250 err:
251 OSSL_PARAM_BLD_free(tmpl);
252 return ok;
253 }
254
255 /* IMEXPORT = IMPORT + EXPORT */
256
257 # define DH_IMEXPORTABLE_PARAMETERS \
258 OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_P, NULL, 0), \
259 OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_Q, NULL, 0), \
260 OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_G, NULL, 0), \
261 OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_COFACTOR, NULL, 0), \
262 OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_GINDEX, NULL), \
263 OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_PCOUNTER, NULL), \
264 OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_H, NULL), \
265 OSSL_PARAM_int(OSSL_PKEY_PARAM_DH_PRIV_LEN, NULL), \
266 OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_FFC_SEED, NULL, 0), \
267 OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_GROUP_NAME, NULL, 0)
268 # define DH_IMEXPORTABLE_PUBLIC_KEY \
269 OSSL_PARAM_BN(OSSL_PKEY_PARAM_PUB_KEY, NULL, 0)
270 # define DH_IMEXPORTABLE_PRIVATE_KEY \
271 OSSL_PARAM_BN(OSSL_PKEY_PARAM_PRIV_KEY, NULL, 0)
272 static const OSSL_PARAM dh_all_types[] = {
273 DH_IMEXPORTABLE_PARAMETERS,
274 DH_IMEXPORTABLE_PUBLIC_KEY,
275 DH_IMEXPORTABLE_PRIVATE_KEY,
276 OSSL_PARAM_END
277 };
278 static const OSSL_PARAM dh_parameter_types[] = {
279 DH_IMEXPORTABLE_PARAMETERS,
280 OSSL_PARAM_END
281 };
282 static const OSSL_PARAM dh_key_types[] = {
283 DH_IMEXPORTABLE_PUBLIC_KEY,
284 DH_IMEXPORTABLE_PRIVATE_KEY,
285 OSSL_PARAM_END
286 };
287 static const OSSL_PARAM *dh_types[] = {
288 NULL, /* Index 0 = none of them */
289 dh_parameter_types, /* Index 1 = parameter types */
290 dh_key_types, /* Index 2 = key types */
291 dh_all_types /* Index 3 = 1 + 2 */
292 };
293
dh_imexport_types(int selection)294 static const OSSL_PARAM *dh_imexport_types(int selection)
295 {
296 int type_select = 0;
297
298 if ((selection & OSSL_KEYMGMT_SELECT_ALL_PARAMETERS) != 0)
299 type_select += 1;
300 if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
301 type_select += 2;
302 return dh_types[type_select];
303 }
304
dh_import_types(int selection)305 static const OSSL_PARAM *dh_import_types(int selection)
306 {
307 return dh_imexport_types(selection);
308 }
309
dh_export_types(int selection)310 static const OSSL_PARAM *dh_export_types(int selection)
311 {
312 return dh_imexport_types(selection);
313 }
314
dh_get_params(void * key,OSSL_PARAM params[])315 static ossl_inline int dh_get_params(void *key, OSSL_PARAM params[])
316 {
317 DH *dh = key;
318 OSSL_PARAM *p;
319
320 if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_BITS)) != NULL
321 && !OSSL_PARAM_set_int(p, DH_bits(dh)))
322 return 0;
323 if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_SECURITY_BITS)) != NULL
324 && !OSSL_PARAM_set_int(p, DH_security_bits(dh)))
325 return 0;
326 if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_MAX_SIZE)) != NULL
327 && !OSSL_PARAM_set_int(p, DH_size(dh)))
328 return 0;
329 if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_ENCODED_PUBLIC_KEY)) != NULL) {
330 if (p->data_type != OSSL_PARAM_OCTET_STRING)
331 return 0;
332 p->return_size = ossl_dh_key2buf(dh, (unsigned char **)&p->data,
333 p->data_size, 0);
334 if (p->return_size == 0)
335 return 0;
336 }
337
338 return ossl_dh_params_todata(dh, NULL, params)
339 && ossl_dh_key_todata(dh, NULL, params, 1);
340 }
341
342 static const OSSL_PARAM dh_params[] = {
343 OSSL_PARAM_int(OSSL_PKEY_PARAM_BITS, NULL),
344 OSSL_PARAM_int(OSSL_PKEY_PARAM_SECURITY_BITS, NULL),
345 OSSL_PARAM_int(OSSL_PKEY_PARAM_MAX_SIZE, NULL),
346 OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_ENCODED_PUBLIC_KEY, NULL, 0),
347 DH_IMEXPORTABLE_PARAMETERS,
348 DH_IMEXPORTABLE_PUBLIC_KEY,
349 DH_IMEXPORTABLE_PRIVATE_KEY,
350 OSSL_PARAM_END
351 };
352
dh_gettable_params(void * provctx)353 static const OSSL_PARAM *dh_gettable_params(void *provctx)
354 {
355 return dh_params;
356 }
357
358 static const OSSL_PARAM dh_known_settable_params[] = {
359 OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_ENCODED_PUBLIC_KEY, NULL, 0),
360 OSSL_PARAM_END
361 };
362
dh_settable_params(void * provctx)363 static const OSSL_PARAM *dh_settable_params(void *provctx)
364 {
365 return dh_known_settable_params;
366 }
367
dh_set_params(void * key,const OSSL_PARAM params[])368 static int dh_set_params(void *key, const OSSL_PARAM params[])
369 {
370 DH *dh = key;
371 const OSSL_PARAM *p;
372
373 p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_ENCODED_PUBLIC_KEY);
374 if (p != NULL
375 && (p->data_type != OSSL_PARAM_OCTET_STRING
376 || !ossl_dh_buf2key(dh, p->data, p->data_size)))
377 return 0;
378
379 return 1;
380 }
381
dh_validate_public(const DH * dh,int checktype)382 static int dh_validate_public(const DH *dh, int checktype)
383 {
384 const BIGNUM *pub_key = NULL;
385 int res = 0;
386
387 DH_get0_key(dh, &pub_key, NULL);
388 if (pub_key == NULL)
389 return 0;
390
391 /*
392 * The partial test is only valid for named group's with q = (p - 1) / 2
393 * but for that case it is also fully sufficient to check the key validity.
394 */
395 if (ossl_dh_is_named_safe_prime_group(dh))
396 return ossl_dh_check_pub_key_partial(dh, pub_key, &res);
397
398 return DH_check_pub_key_ex(dh, pub_key);
399 }
400
dh_validate_private(const DH * dh)401 static int dh_validate_private(const DH *dh)
402 {
403 int status = 0;
404 const BIGNUM *priv_key = NULL;
405
406 DH_get0_key(dh, NULL, &priv_key);
407 if (priv_key == NULL)
408 return 0;
409 return ossl_dh_check_priv_key(dh, priv_key, &status);
410 }
411
dh_validate(const void * keydata,int selection,int checktype)412 static int dh_validate(const void *keydata, int selection, int checktype)
413 {
414 const DH *dh = keydata;
415 int ok = 1;
416
417 if (!ossl_prov_is_running())
418 return 0;
419
420 if ((selection & DH_POSSIBLE_SELECTIONS) == 0)
421 return 1; /* nothing to validate */
422
423 if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0) {
424 /*
425 * Both of these functions check parameters. DH_check_params_ex()
426 * performs a lightweight check (e.g. it does not check that p is a
427 * safe prime)
428 */
429 if (checktype == OSSL_KEYMGMT_VALIDATE_QUICK_CHECK)
430 ok = ok && DH_check_params_ex(dh);
431 else
432 ok = ok && DH_check_ex(dh);
433 }
434
435 if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
436 ok = ok && dh_validate_public(dh, checktype);
437
438 if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
439 ok = ok && dh_validate_private(dh);
440
441 if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR)
442 == OSSL_KEYMGMT_SELECT_KEYPAIR)
443 ok = ok && ossl_dh_check_pairwise(dh);
444 return ok;
445 }
446
dh_gen_init_base(void * provctx,int selection,const OSSL_PARAM params[],int type)447 static void *dh_gen_init_base(void *provctx, int selection,
448 const OSSL_PARAM params[], int type)
449 {
450 OSSL_LIB_CTX *libctx = PROV_LIBCTX_OF(provctx);
451 struct dh_gen_ctx *gctx = NULL;
452
453 if (!ossl_prov_is_running())
454 return NULL;
455
456 if ((selection & (OSSL_KEYMGMT_SELECT_KEYPAIR
457 | OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS)) == 0)
458 return NULL;
459
460 if ((gctx = OPENSSL_zalloc(sizeof(*gctx))) != NULL) {
461 gctx->selection = selection;
462 gctx->libctx = libctx;
463 gctx->pbits = 2048;
464 gctx->qbits = 224;
465 gctx->mdname = NULL;
466 #ifdef FIPS_MODULE
467 gctx->gen_type = (type == DH_FLAG_TYPE_DHX)
468 ? DH_PARAMGEN_TYPE_FIPS_186_4
469 : DH_PARAMGEN_TYPE_GROUP;
470 #else
471 gctx->gen_type = (type == DH_FLAG_TYPE_DHX)
472 ? DH_PARAMGEN_TYPE_FIPS_186_2
473 : DH_PARAMGEN_TYPE_GENERATOR;
474 #endif
475 gctx->gindex = -1;
476 gctx->hindex = 0;
477 gctx->pcounter = -1;
478 gctx->generator = DH_GENERATOR_2;
479 gctx->dh_type = type;
480 }
481 if (!dh_gen_set_params(gctx, params)) {
482 OPENSSL_free(gctx);
483 gctx = NULL;
484 }
485 return gctx;
486 }
487
dh_gen_init(void * provctx,int selection,const OSSL_PARAM params[])488 static void *dh_gen_init(void *provctx, int selection,
489 const OSSL_PARAM params[])
490 {
491 return dh_gen_init_base(provctx, selection, params, DH_FLAG_TYPE_DH);
492 }
493
dhx_gen_init(void * provctx,int selection,const OSSL_PARAM params[])494 static void *dhx_gen_init(void *provctx, int selection,
495 const OSSL_PARAM params[])
496 {
497 return dh_gen_init_base(provctx, selection, params, DH_FLAG_TYPE_DHX);
498 }
499
dh_gen_set_template(void * genctx,void * templ)500 static int dh_gen_set_template(void *genctx, void *templ)
501 {
502 struct dh_gen_ctx *gctx = genctx;
503 DH *dh = templ;
504
505 if (!ossl_prov_is_running() || gctx == NULL || dh == NULL)
506 return 0;
507 gctx->ffc_params = ossl_dh_get0_params(dh);
508 return 1;
509 }
510
dh_set_gen_seed(struct dh_gen_ctx * gctx,unsigned char * seed,size_t seedlen)511 static int dh_set_gen_seed(struct dh_gen_ctx *gctx, unsigned char *seed,
512 size_t seedlen)
513 {
514 OPENSSL_clear_free(gctx->seed, gctx->seedlen);
515 gctx->seed = NULL;
516 gctx->seedlen = 0;
517 if (seed != NULL && seedlen > 0) {
518 gctx->seed = OPENSSL_memdup(seed, seedlen);
519 if (gctx->seed == NULL)
520 return 0;
521 gctx->seedlen = seedlen;
522 }
523 return 1;
524 }
525
dh_gen_common_set_params(void * genctx,const OSSL_PARAM params[])526 static int dh_gen_common_set_params(void *genctx, const OSSL_PARAM params[])
527 {
528 struct dh_gen_ctx *gctx = genctx;
529 const OSSL_PARAM *p;
530 int gen_type = -1;
531
532 if (gctx == NULL)
533 return 0;
534 if (params == NULL)
535 return 1;
536
537 p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_TYPE);
538 if (p != NULL) {
539 if (p->data_type != OSSL_PARAM_UTF8_STRING
540 || ((gen_type =
541 dh_gen_type_name2id_w_default(p->data, gctx->dh_type)) == -1)) {
542 ERR_raise(ERR_LIB_PROV, ERR_R_PASSED_INVALID_ARGUMENT);
543 return 0;
544 }
545 if (gen_type != -1)
546 gctx->gen_type = gen_type;
547 }
548 p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_GROUP_NAME);
549 if (p != NULL) {
550 const DH_NAMED_GROUP *group = NULL;
551
552 if (p->data_type != OSSL_PARAM_UTF8_STRING
553 || p->data == NULL
554 || (group = ossl_ffc_name_to_dh_named_group(p->data)) == NULL
555 || ((gctx->group_nid =
556 ossl_ffc_named_group_get_uid(group)) == NID_undef)) {
557 ERR_raise(ERR_LIB_PROV, ERR_R_PASSED_INVALID_ARGUMENT);
558 return 0;
559 }
560 }
561 if ((p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_PBITS)) != NULL
562 && !OSSL_PARAM_get_size_t(p, &gctx->pbits))
563 return 0;
564 p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_DH_PRIV_LEN);
565 if (p != NULL && !OSSL_PARAM_get_int(p, &gctx->priv_len))
566 return 0;
567 return 1;
568 }
569
dh_gen_settable_params(ossl_unused void * genctx,ossl_unused void * provctx)570 static const OSSL_PARAM *dh_gen_settable_params(ossl_unused void *genctx,
571 ossl_unused void *provctx)
572 {
573 static const OSSL_PARAM dh_gen_settable[] = {
574 OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_FFC_TYPE, NULL, 0),
575 OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_GROUP_NAME, NULL, 0),
576 OSSL_PARAM_int(OSSL_PKEY_PARAM_DH_PRIV_LEN, NULL),
577 OSSL_PARAM_size_t(OSSL_PKEY_PARAM_FFC_PBITS, NULL),
578 OSSL_PARAM_int(OSSL_PKEY_PARAM_DH_GENERATOR, NULL),
579 OSSL_PARAM_END
580 };
581 return dh_gen_settable;
582 }
583
dhx_gen_settable_params(ossl_unused void * genctx,ossl_unused void * provctx)584 static const OSSL_PARAM *dhx_gen_settable_params(ossl_unused void *genctx,
585 ossl_unused void *provctx)
586 {
587 static const OSSL_PARAM dhx_gen_settable[] = {
588 OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_FFC_TYPE, NULL, 0),
589 OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_GROUP_NAME, NULL, 0),
590 OSSL_PARAM_int(OSSL_PKEY_PARAM_DH_PRIV_LEN, NULL),
591 OSSL_PARAM_size_t(OSSL_PKEY_PARAM_FFC_PBITS, NULL),
592 OSSL_PARAM_size_t(OSSL_PKEY_PARAM_FFC_QBITS, NULL),
593 OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_FFC_DIGEST, NULL, 0),
594 OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_FFC_DIGEST_PROPS, NULL, 0),
595 OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_GINDEX, NULL),
596 OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_FFC_SEED, NULL, 0),
597 OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_PCOUNTER, NULL),
598 OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_H, NULL),
599 OSSL_PARAM_END
600 };
601 return dhx_gen_settable;
602 }
603
dhx_gen_set_params(void * genctx,const OSSL_PARAM params[])604 static int dhx_gen_set_params(void *genctx, const OSSL_PARAM params[])
605 {
606 struct dh_gen_ctx *gctx = genctx;
607 const OSSL_PARAM *p;
608
609 if (!dh_gen_common_set_params(genctx, params))
610 return 0;
611
612 /* Parameters related to fips186-4 and fips186-2 */
613 p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_GINDEX);
614 if (p != NULL && !OSSL_PARAM_get_int(p, &gctx->gindex))
615 return 0;
616 p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_PCOUNTER);
617 if (p != NULL && !OSSL_PARAM_get_int(p, &gctx->pcounter))
618 return 0;
619 p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_H);
620 if (p != NULL && !OSSL_PARAM_get_int(p, &gctx->hindex))
621 return 0;
622 p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_SEED);
623 if (p != NULL
624 && (p->data_type != OSSL_PARAM_OCTET_STRING
625 || !dh_set_gen_seed(gctx, p->data, p->data_size)))
626 return 0;
627 if ((p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_QBITS)) != NULL
628 && !OSSL_PARAM_get_size_t(p, &gctx->qbits))
629 return 0;
630 p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_DIGEST);
631 if (p != NULL) {
632 if (p->data_type != OSSL_PARAM_UTF8_STRING)
633 return 0;
634 OPENSSL_free(gctx->mdname);
635 gctx->mdname = OPENSSL_strdup(p->data);
636 if (gctx->mdname == NULL)
637 return 0;
638 }
639 p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_DIGEST_PROPS);
640 if (p != NULL) {
641 if (p->data_type != OSSL_PARAM_UTF8_STRING)
642 return 0;
643 OPENSSL_free(gctx->mdprops);
644 gctx->mdprops = OPENSSL_strdup(p->data);
645 if (gctx->mdprops == NULL)
646 return 0;
647 }
648
649 /* Parameters that are not allowed for DHX */
650 p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_DH_GENERATOR);
651 if (p != NULL) {
652 ERR_raise(ERR_LIB_PROV, ERR_R_UNSUPPORTED);
653 return 0;
654 }
655 return 1;
656 }
657
dh_gen_set_params(void * genctx,const OSSL_PARAM params[])658 static int dh_gen_set_params(void *genctx, const OSSL_PARAM params[])
659 {
660 struct dh_gen_ctx *gctx = genctx;
661 const OSSL_PARAM *p;
662
663 if (!dh_gen_common_set_params(genctx, params))
664 return 0;
665
666 p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_DH_GENERATOR);
667 if (p != NULL && !OSSL_PARAM_get_int(p, &gctx->generator))
668 return 0;
669
670 /* Parameters that are not allowed for DH */
671 if (OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_GINDEX) != NULL
672 || OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_PCOUNTER) != NULL
673 || OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_H) != NULL
674 || OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_SEED) != NULL
675 || OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_QBITS) != NULL
676 || OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_DIGEST) != NULL
677 || OSSL_PARAM_locate_const(params,
678 OSSL_PKEY_PARAM_FFC_DIGEST_PROPS) != NULL) {
679 ERR_raise(ERR_LIB_PROV, ERR_R_PASSED_INVALID_ARGUMENT);
680 return 0;
681 }
682 return 1;
683 }
684
dh_gencb(int p,int n,BN_GENCB * cb)685 static int dh_gencb(int p, int n, BN_GENCB *cb)
686 {
687 struct dh_gen_ctx *gctx = BN_GENCB_get_arg(cb);
688 OSSL_PARAM params[] = { OSSL_PARAM_END, OSSL_PARAM_END, OSSL_PARAM_END };
689
690 params[0] = OSSL_PARAM_construct_int(OSSL_GEN_PARAM_POTENTIAL, &p);
691 params[1] = OSSL_PARAM_construct_int(OSSL_GEN_PARAM_ITERATION, &n);
692
693 return gctx->cb(params, gctx->cbarg);
694 }
695
dh_gen(void * genctx,OSSL_CALLBACK * osslcb,void * cbarg)696 static void *dh_gen(void *genctx, OSSL_CALLBACK *osslcb, void *cbarg)
697 {
698 int ret = 0;
699 struct dh_gen_ctx *gctx = genctx;
700 DH *dh = NULL;
701 BN_GENCB *gencb = NULL;
702 FFC_PARAMS *ffc;
703
704 if (!ossl_prov_is_running() || gctx == NULL)
705 return NULL;
706
707 /*
708 * If a group name is selected then the type is group regardless of what
709 * the user selected. This overrides rather than errors for backwards
710 * compatibility.
711 */
712 if (gctx->group_nid != NID_undef)
713 gctx->gen_type = DH_PARAMGEN_TYPE_GROUP;
714
715 /*
716 * Do a bounds check on context gen_type. Must be in range:
717 * DH_PARAMGEN_TYPE_GENERATOR <= gen_type <= DH_PARAMGEN_TYPE_GROUP
718 * Noted here as this needs to be adjusted if a new group type is
719 * added.
720 */
721 if (!ossl_assert((gctx->gen_type >= DH_PARAMGEN_TYPE_GENERATOR)
722 && (gctx->gen_type <= DH_PARAMGEN_TYPE_GROUP))) {
723 ERR_raise_data(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR,
724 "gen_type set to unsupported value %d", gctx->gen_type);
725 return NULL;
726 }
727
728 /* For parameter generation - If there is a group name just create it */
729 if (gctx->gen_type == DH_PARAMGEN_TYPE_GROUP
730 && gctx->ffc_params == NULL) {
731 /* Select a named group if there is not one already */
732 if (gctx->group_nid == NID_undef)
733 gctx->group_nid = ossl_dh_get_named_group_uid_from_size(gctx->pbits);
734 if (gctx->group_nid == NID_undef)
735 return NULL;
736 dh = ossl_dh_new_by_nid_ex(gctx->libctx, gctx->group_nid);
737 if (dh == NULL)
738 return NULL;
739 ffc = ossl_dh_get0_params(dh);
740 } else {
741 dh = ossl_dh_new_ex(gctx->libctx);
742 if (dh == NULL)
743 return NULL;
744 ffc = ossl_dh_get0_params(dh);
745
746 /* Copy the template value if one was passed */
747 if (gctx->ffc_params != NULL
748 && !ossl_ffc_params_copy(ffc, gctx->ffc_params))
749 goto end;
750
751 if (!ossl_ffc_params_set_seed(ffc, gctx->seed, gctx->seedlen))
752 goto end;
753 if (gctx->gindex != -1) {
754 ossl_ffc_params_set_gindex(ffc, gctx->gindex);
755 if (gctx->pcounter != -1)
756 ossl_ffc_params_set_pcounter(ffc, gctx->pcounter);
757 } else if (gctx->hindex != 0) {
758 ossl_ffc_params_set_h(ffc, gctx->hindex);
759 }
760 if (gctx->mdname != NULL)
761 ossl_ffc_set_digest(ffc, gctx->mdname, gctx->mdprops);
762 gctx->cb = osslcb;
763 gctx->cbarg = cbarg;
764 gencb = BN_GENCB_new();
765 if (gencb != NULL)
766 BN_GENCB_set(gencb, dh_gencb, genctx);
767
768 if ((gctx->selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0) {
769 /*
770 * NOTE: The old safe prime generator code is not used in fips mode,
771 * (i.e internally it ignores the generator and chooses a named
772 * group based on pbits.
773 */
774 if (gctx->gen_type == DH_PARAMGEN_TYPE_GENERATOR)
775 ret = DH_generate_parameters_ex(dh, gctx->pbits,
776 gctx->generator, gencb);
777 else
778 ret = ossl_dh_generate_ffc_parameters(dh, gctx->gen_type,
779 gctx->pbits, gctx->qbits,
780 gencb);
781 if (ret <= 0)
782 goto end;
783 }
784 }
785
786 if ((gctx->selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0) {
787 if (ffc->p == NULL || ffc->g == NULL)
788 goto end;
789 if (gctx->priv_len > 0)
790 DH_set_length(dh, (long)gctx->priv_len);
791 ossl_ffc_params_enable_flags(ffc, FFC_PARAM_FLAG_VALIDATE_LEGACY,
792 gctx->gen_type == DH_PARAMGEN_TYPE_FIPS_186_2);
793 if (DH_generate_key(dh) <= 0)
794 goto end;
795 }
796 DH_clear_flags(dh, DH_FLAG_TYPE_MASK);
797 DH_set_flags(dh, gctx->dh_type);
798
799 ret = 1;
800 end:
801 if (ret <= 0) {
802 DH_free(dh);
803 dh = NULL;
804 }
805 BN_GENCB_free(gencb);
806 return dh;
807 }
808
dh_gen_cleanup(void * genctx)809 static void dh_gen_cleanup(void *genctx)
810 {
811 struct dh_gen_ctx *gctx = genctx;
812
813 if (gctx == NULL)
814 return;
815
816 OPENSSL_free(gctx->mdname);
817 OPENSSL_free(gctx->mdprops);
818 OPENSSL_clear_free(gctx->seed, gctx->seedlen);
819 OPENSSL_free(gctx);
820 }
821
dh_load(const void * reference,size_t reference_sz)822 static void *dh_load(const void *reference, size_t reference_sz)
823 {
824 DH *dh = NULL;
825
826 if (ossl_prov_is_running() && reference_sz == sizeof(dh)) {
827 /* The contents of the reference is the address to our object */
828 dh = *(DH **)reference;
829 /* We grabbed, so we detach it */
830 *(DH **)reference = NULL;
831 return dh;
832 }
833 return NULL;
834 }
835
dh_dup(const void * keydata_from,int selection)836 static void *dh_dup(const void *keydata_from, int selection)
837 {
838 if (ossl_prov_is_running())
839 return ossl_dh_dup(keydata_from, selection);
840 return NULL;
841 }
842
843 const OSSL_DISPATCH ossl_dh_keymgmt_functions[] = {
844 { OSSL_FUNC_KEYMGMT_NEW, (void (*)(void))dh_newdata },
845 { OSSL_FUNC_KEYMGMT_GEN_INIT, (void (*)(void))dh_gen_init },
846 { OSSL_FUNC_KEYMGMT_GEN_SET_TEMPLATE, (void (*)(void))dh_gen_set_template },
847 { OSSL_FUNC_KEYMGMT_GEN_SET_PARAMS, (void (*)(void))dh_gen_set_params },
848 { OSSL_FUNC_KEYMGMT_GEN_SETTABLE_PARAMS,
849 (void (*)(void))dh_gen_settable_params },
850 { OSSL_FUNC_KEYMGMT_GEN, (void (*)(void))dh_gen },
851 { OSSL_FUNC_KEYMGMT_GEN_CLEANUP, (void (*)(void))dh_gen_cleanup },
852 { OSSL_FUNC_KEYMGMT_LOAD, (void (*)(void))dh_load },
853 { OSSL_FUNC_KEYMGMT_FREE, (void (*)(void))dh_freedata },
854 { OSSL_FUNC_KEYMGMT_GET_PARAMS, (void (*) (void))dh_get_params },
855 { OSSL_FUNC_KEYMGMT_GETTABLE_PARAMS, (void (*) (void))dh_gettable_params },
856 { OSSL_FUNC_KEYMGMT_SET_PARAMS, (void (*) (void))dh_set_params },
857 { OSSL_FUNC_KEYMGMT_SETTABLE_PARAMS, (void (*) (void))dh_settable_params },
858 { OSSL_FUNC_KEYMGMT_HAS, (void (*)(void))dh_has },
859 { OSSL_FUNC_KEYMGMT_MATCH, (void (*)(void))dh_match },
860 { OSSL_FUNC_KEYMGMT_VALIDATE, (void (*)(void))dh_validate },
861 { OSSL_FUNC_KEYMGMT_IMPORT, (void (*)(void))dh_import },
862 { OSSL_FUNC_KEYMGMT_IMPORT_TYPES, (void (*)(void))dh_import_types },
863 { OSSL_FUNC_KEYMGMT_EXPORT, (void (*)(void))dh_export },
864 { OSSL_FUNC_KEYMGMT_EXPORT_TYPES, (void (*)(void))dh_export_types },
865 { OSSL_FUNC_KEYMGMT_DUP, (void (*)(void))dh_dup },
866 OSSL_DISPATCH_END
867 };
868
869 /* For any DH key, we use the "DH" algorithms regardless of sub-type. */
dhx_query_operation_name(int operation_id)870 static const char *dhx_query_operation_name(int operation_id)
871 {
872 return "DH";
873 }
874
875 const OSSL_DISPATCH ossl_dhx_keymgmt_functions[] = {
876 { OSSL_FUNC_KEYMGMT_NEW, (void (*)(void))dhx_newdata },
877 { OSSL_FUNC_KEYMGMT_GEN_INIT, (void (*)(void))dhx_gen_init },
878 { OSSL_FUNC_KEYMGMT_GEN_SET_TEMPLATE, (void (*)(void))dh_gen_set_template },
879 { OSSL_FUNC_KEYMGMT_GEN_SET_PARAMS, (void (*)(void))dhx_gen_set_params },
880 { OSSL_FUNC_KEYMGMT_GEN_SETTABLE_PARAMS,
881 (void (*)(void))dhx_gen_settable_params },
882 { OSSL_FUNC_KEYMGMT_GEN, (void (*)(void))dh_gen },
883 { OSSL_FUNC_KEYMGMT_GEN_CLEANUP, (void (*)(void))dh_gen_cleanup },
884 { OSSL_FUNC_KEYMGMT_LOAD, (void (*)(void))dh_load },
885 { OSSL_FUNC_KEYMGMT_FREE, (void (*)(void))dh_freedata },
886 { OSSL_FUNC_KEYMGMT_GET_PARAMS, (void (*) (void))dh_get_params },
887 { OSSL_FUNC_KEYMGMT_GETTABLE_PARAMS, (void (*) (void))dh_gettable_params },
888 { OSSL_FUNC_KEYMGMT_SET_PARAMS, (void (*) (void))dh_set_params },
889 { OSSL_FUNC_KEYMGMT_SETTABLE_PARAMS, (void (*) (void))dh_settable_params },
890 { OSSL_FUNC_KEYMGMT_HAS, (void (*)(void))dh_has },
891 { OSSL_FUNC_KEYMGMT_MATCH, (void (*)(void))dh_match },
892 { OSSL_FUNC_KEYMGMT_VALIDATE, (void (*)(void))dh_validate },
893 { OSSL_FUNC_KEYMGMT_IMPORT, (void (*)(void))dh_import },
894 { OSSL_FUNC_KEYMGMT_IMPORT_TYPES, (void (*)(void))dh_import_types },
895 { OSSL_FUNC_KEYMGMT_EXPORT, (void (*)(void))dh_export },
896 { OSSL_FUNC_KEYMGMT_EXPORT_TYPES, (void (*)(void))dh_export_types },
897 { OSSL_FUNC_KEYMGMT_QUERY_OPERATION_NAME,
898 (void (*)(void))dhx_query_operation_name },
899 { OSSL_FUNC_KEYMGMT_DUP, (void (*)(void))dh_dup },
900 OSSL_DISPATCH_END
901 };
902
