providers/implementations/keymgmt/dh_kmgmt.c

   1 /*
   2  * Copyright 2019-2020 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
  16 #include <string.h> /* strcmp */
  17 #include <openssl/core_dispatch.h>
  18 #include <openssl/core_names.h>
  19 #include <openssl/bn.h>
  20 #include <openssl/err.h>
  21 #include "prov/implementations.h"
  22 #include "prov/providercommon.h"
  23 #include "prov/provider_ctx.h"
  24 #include "crypto/dh.h"
  25 #include "internal/sizes.h"
  26 #include "internal/nelem.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
  50 #define DH_POSSIBLE_SELECTIONS                                                 \
  51     (OSSL_KEYMGMT_SELECT_KEYPAIR | OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS)
  52
  53 struct dh_gen_ctx {
  54     OSSL_LIB_CTX *libctx;
  55
  56     FFC_PARAMS *ffc_params;
  57     int selection;
  58     /* All these parameters are used for parameter generation only */
  59     /* If there is a group name then the remaining parameters are not needed */
  60     int group_nid;
  61     size_t pbits;
  62     size_t qbits;
  63     unsigned char *seed; /* optional FIPS186-4 param for testing */
  64     size_t seedlen;
  65     int gindex; /* optional  FIPS186-4 generator index (ignored if -1) */
  66     int gen_type; /* see dhtype2id */
  67     int generator; /* Used by DH_PARAMGEN_TYPE_GENERATOR in non fips mode only */
  68     int pcounter;
  69     int hindex;
  70     int priv_len;
  71
  72     const char *mdname;
  73     const char *mdprops;
  74     OSSL_CALLBACK *cb;
  75     void *cbarg;
  76     int dh_type;
  77 };
  78
  79 typedef struct dh_name2id_st{
  80     const char *name;
  81     int id;
  82 } DH_GENTYPE_NAME2ID;
  83
  84 static const DH_GENTYPE_NAME2ID dhtype2id[]=
  85 {
  86     { "default", DH_PARAMGEN_TYPE_FIPS_186_4 },
  87     { "fips186_4", DH_PARAMGEN_TYPE_FIPS_186_4 },
  88     { "fips186_2", DH_PARAMGEN_TYPE_FIPS_186_2 },
  89     { "group", DH_PARAMGEN_TYPE_GROUP },
  90     { "generator", DH_PARAMGEN_TYPE_GENERATOR }
  91 };
  92
  93 const char *dh_gen_type_id2name(int id)
  94 {
  95     size_t i;
  96
  97     for (i = 0; i < OSSL_NELEM(dhtype2id); ++i) {
  98         if (dhtype2id[i].id == id)
  99             return dhtype2id[i].name;
 100     }
 101     return NULL;
 102 }
 103
 104 static int dh_gen_type_name2id(const char *name)
 105 {
 106     size_t i;
 107
 108     for (i = 0; i < OSSL_NELEM(dhtype2id); ++i) {
 109         if (strcmp(dhtype2id[i].name, name) == 0)
 110             return dhtype2id[i].id;
 111     }
 112     return -1;
 113 }
 114
 115 static void *dh_newdata(void *provctx)
 116 {
 117     DH *dh = NULL;
 118
 119     if (ossl_prov_is_running()) {
 120         dh = dh_new_ex(PROV_LIBCTX_OF(provctx));
 121         if (dh != NULL) {
 122             DH_clear_flags(dh, DH_FLAG_TYPE_MASK);
 123             DH_set_flags(dh, DH_FLAG_TYPE_DH);
 124         }
 125     }
 126     return dh;
 127 }
 128
 129 static void *dhx_newdata(void *provctx)
 130 {
 131     DH *dh = NULL;
 132
 133     dh = dh_new_ex(PROV_LIBCTX_OF(provctx));
 134     if (dh != NULL) {
 135         DH_clear_flags(dh, DH_FLAG_TYPE_MASK);
 136         DH_set_flags(dh, DH_FLAG_TYPE_DHX);
 137     }
 138     return dh;
 139 }
 140
 141 static void dh_freedata(void *keydata)
 142 {
 143     DH_free(keydata);
 144 }
 145
 146 static int dh_has(const void *keydata, int selection)
 147 {
 148     const DH *dh = keydata;
 149     int ok = 0;
 150
 151     if (ossl_prov_is_running() && dh != NULL) {
 152         if ((selection & DH_POSSIBLE_SELECTIONS) != 0)
 153             ok = 1;
 154
 155         if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
 156             ok = ok && (DH_get0_pub_key(dh) != NULL);
 157         if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 158             ok = ok && (DH_get0_priv_key(dh) != NULL);
 159         if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
 160             ok = ok && (DH_get0_p(dh) != NULL && DH_get0_g(dh) != NULL);
 161     }
 162     return ok;
 163 }
 164
 165 static int dh_match(const void *keydata1, const void *keydata2, int selection)
 166 {
 167     const DH *dh1 = keydata1;
 168     const DH *dh2 = keydata2;
 169     int ok = 1;
 170
 171     if (!ossl_prov_is_running())
 172         return 0;
 173
 174     if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
 175         ok = ok && BN_cmp(DH_get0_pub_key(dh1), DH_get0_pub_key(dh2)) == 0;
 176     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 177         ok = ok && BN_cmp(DH_get0_priv_key(dh1), DH_get0_priv_key(dh2)) == 0;
 178     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0) {
 179         FFC_PARAMS *dhparams1 = dh_get0_params((DH *)dh1);
 180         FFC_PARAMS *dhparams2 = dh_get0_params((DH *)dh2);
 181
 182         ok = ok && ossl_ffc_params_cmp(dhparams1, dhparams2, 1);
 183     }
 184     return ok;
 185 }
 186
 187 static int dh_import(void *keydata, int selection, const OSSL_PARAM params[])
 188 {
 189     DH *dh = keydata;
 190     int ok = 1;
 191
 192     if (!ossl_prov_is_running() || dh == NULL)
 193         return 0;
 194
 195     if ((selection & DH_POSSIBLE_SELECTIONS) == 0)
 196         return 0;
 197
 198     if ((selection & OSSL_KEYMGMT_SELECT_ALL_PARAMETERS) != 0)
 199         ok = ok && dh_params_fromdata(dh, params);
 200
 201     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
 202         ok = ok && dh_key_fromdata(dh, params);
 203
 204     return ok;
 205 }
 206
 207 static int dh_export(void *keydata, int selection, OSSL_CALLBACK *param_cb,
 208                      void *cbarg)
 209 {
 210     DH *dh = keydata;
 211     OSSL_PARAM_BLD *tmpl = NULL;
 212     OSSL_PARAM *params = NULL;
 213     int ok = 1;
 214
 215     if (!ossl_prov_is_running() || dh == NULL)
 216         return 0;
 217
 218     tmpl = OSSL_PARAM_BLD_new();
 219     if (tmpl == NULL)
 220         return 0;
 221
 222     if ((selection & OSSL_KEYMGMT_SELECT_ALL_PARAMETERS) != 0)
 223         ok = ok && dh_params_todata(dh, tmpl, NULL);
 224     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
 225         ok = ok && dh_key_todata(dh, tmpl, NULL);
 226
 227     if (!ok
 228         || (params = OSSL_PARAM_BLD_to_param(tmpl)) == NULL) {
 229         ok = 0;
 230         goto err;
 231     }
 232     ok = param_cb(params, cbarg);
 233     OSSL_PARAM_BLD_free_params(params);
 234 err:
 235     OSSL_PARAM_BLD_free(tmpl);
 236     return ok;
 237 }
 238
 239 /* IMEXPORT = IMPORT + EXPORT */
 240
 241 # define DH_IMEXPORTABLE_PARAMETERS                                            \
 242     OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_P, NULL, 0),                             \
 243     OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_Q, NULL, 0),                             \
 244     OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_G, NULL, 0),                             \
 245     OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_COFACTOR, NULL, 0),                      \
 246     OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_GINDEX, NULL),                          \
 247     OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_PCOUNTER, NULL),                        \
 248     OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_H, NULL),                               \
 249     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_FFC_SEED, NULL, 0),                \
 250     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_GROUP_NAME, NULL, 0),               \
 251     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_DH_PRIV_LEN, NULL, 0)
 252 # define DH_IMEXPORTABLE_PUBLIC_KEY                                            \
 253     OSSL_PARAM_BN(OSSL_PKEY_PARAM_PUB_KEY, NULL, 0)
 254 # define DH_IMEXPORTABLE_PRIVATE_KEY                                           \
 255     OSSL_PARAM_BN(OSSL_PKEY_PARAM_PRIV_KEY, NULL, 0)
 256 static const OSSL_PARAM dh_all_types[] = {
 257     DH_IMEXPORTABLE_PARAMETERS,
 258     DH_IMEXPORTABLE_PUBLIC_KEY,
 259     DH_IMEXPORTABLE_PRIVATE_KEY,
 260     OSSL_PARAM_END
 261 };
 262 static const OSSL_PARAM dh_parameter_types[] = {
 263     DH_IMEXPORTABLE_PARAMETERS,
 264     OSSL_PARAM_END
 265 };
 266 static const OSSL_PARAM dh_key_types[] = {
 267     DH_IMEXPORTABLE_PUBLIC_KEY,
 268     DH_IMEXPORTABLE_PRIVATE_KEY,
 269     OSSL_PARAM_END
 270 };
 271 static const OSSL_PARAM *dh_types[] = {
 272     NULL,                        /* Index 0 = none of them */
 273     dh_parameter_types,          /* Index 1 = parameter types */
 274     dh_key_types,                /* Index 2 = key types */
 275     dh_all_types                 /* Index 3 = 1 + 2 */
 276 };
 277
 278 static const OSSL_PARAM *dh_imexport_types(int selection)
 279 {
 280     int type_select = 0;
 281
 282     if ((selection & OSSL_KEYMGMT_SELECT_ALL_PARAMETERS) != 0)
 283         type_select += 1;
 284     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
 285         type_select += 2;
 286     return dh_types[type_select];
 287 }
 288
 289 static const OSSL_PARAM *dh_import_types(int selection)
 290 {
 291     return dh_imexport_types(selection);
 292 }
 293
 294 static const OSSL_PARAM *dh_export_types(int selection)
 295 {
 296     return dh_imexport_types(selection);
 297 }
 298
 299 static ossl_inline int dh_get_params(void *key, OSSL_PARAM params[])
 300 {
 301     DH *dh = key;
 302     OSSL_PARAM *p;
 303
 304     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_BITS)) != NULL
 305         && !OSSL_PARAM_set_int(p, DH_bits(dh)))
 306         return 0;
 307     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_SECURITY_BITS)) != NULL
 308         && !OSSL_PARAM_set_int(p, DH_security_bits(dh)))
 309         return 0;
 310     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_MAX_SIZE)) != NULL
 311         && !OSSL_PARAM_set_int(p, DH_size(dh)))
 312         return 0;
 313     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_ENCODED_PUBLIC_KEY)) != NULL) {
 314         if (p->data_type != OSSL_PARAM_OCTET_STRING)
 315             return 0;
 316         p->return_size = dh_key2buf(dh, (unsigned char **)&p->data,
 317                                     p->data_size, 0);
 318         if (p->return_size == 0)
 319             return 0;
 320     }
 321
 322     return dh_params_todata(dh, NULL, params)
 323         && dh_key_todata(dh, NULL, params);
 324 }
 325
 326 static const OSSL_PARAM dh_params[] = {
 327     OSSL_PARAM_int(OSSL_PKEY_PARAM_BITS, NULL),
 328     OSSL_PARAM_int(OSSL_PKEY_PARAM_SECURITY_BITS, NULL),
 329     OSSL_PARAM_int(OSSL_PKEY_PARAM_MAX_SIZE, NULL),
 330     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_ENCODED_PUBLIC_KEY, NULL, 0),
 331     DH_IMEXPORTABLE_PARAMETERS,
 332     DH_IMEXPORTABLE_PUBLIC_KEY,
 333     DH_IMEXPORTABLE_PRIVATE_KEY,
 334     OSSL_PARAM_END
 335 };
 336
 337 static const OSSL_PARAM *dh_gettable_params(void *provctx)
 338 {
 339     return dh_params;
 340 }
 341
 342 static const OSSL_PARAM dh_known_settable_params[] = {
 343     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_ENCODED_PUBLIC_KEY, NULL, 0),
 344     OSSL_PARAM_END
 345 };
 346
 347 static const OSSL_PARAM *dh_settable_params(void *provctx)
 348 {
 349     return dh_known_settable_params;
 350 }
 351
 352 static int dh_set_params(void *key, const OSSL_PARAM params[])
 353 {
 354     DH *dh = key;
 355     const OSSL_PARAM *p;
 356
 357     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_ENCODED_PUBLIC_KEY);
 358     if (p != NULL
 359             && (p->data_type != OSSL_PARAM_OCTET_STRING
 360                 || !dh_buf2key(dh, p->data, p->data_size)))
 361         return 0;
 362
 363     return 1;
 364 }
 365
 366 static int dh_validate_public(DH *dh)
 367 {
 368     const BIGNUM *pub_key = NULL;
 369
 370     DH_get0_key(dh, &pub_key, NULL);
 371     if (pub_key == NULL)
 372         return 0;
 373     return DH_check_pub_key_ex(dh, pub_key);
 374 }
 375
 376 static int dh_validate_private(DH *dh)
 377 {
 378     int status = 0;
 379     const BIGNUM *priv_key = NULL;
 380
 381     DH_get0_key(dh, NULL, &priv_key);
 382     if (priv_key == NULL)
 383         return 0;
 384     return dh_check_priv_key(dh, priv_key, &status);;
 385 }
 386
 387 static int dh_validate(void *keydata, int selection)
 388 {
 389     DH *dh = keydata;
 390     int ok = 0;
 391
 392     if (!ossl_prov_is_running())
 393         return 0;
 394
 395     if ((selection & DH_POSSIBLE_SELECTIONS) != 0)
 396         ok = 1;
 397
 398     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
 399         ok = ok && DH_check_params_ex(dh);
 400
 401     if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
 402         ok = ok && dh_validate_public(dh);
 403
 404     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 405         ok = ok && dh_validate_private(dh);
 406
 407     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR)
 408             == OSSL_KEYMGMT_SELECT_KEYPAIR)
 409         ok = ok && dh_check_pairwise(dh);
 410     return ok;
 411 }
 412
 413 static void *dh_gen_init_base(void *provctx, int selection, int type)
 414 {
 415     OSSL_LIB_CTX *libctx = PROV_LIBCTX_OF(provctx);
 416     struct dh_gen_ctx *gctx = NULL;
 417
 418     if (!ossl_prov_is_running())
 419         return NULL;
 420
 421     if ((selection & (OSSL_KEYMGMT_SELECT_KEYPAIR
 422                       | OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS)) == 0)
 423         return NULL;
 424
 425     if ((gctx = OPENSSL_zalloc(sizeof(*gctx))) != NULL) {
 426         gctx->selection = selection;
 427         gctx->libctx = libctx;
 428         gctx->pbits = 2048;
 429         gctx->qbits = 224;
 430         gctx->mdname = NULL;
 431         gctx->gen_type = DH_PARAMGEN_TYPE_FIPS_186_4;
 432         gctx->gindex = -1;
 433         gctx->hindex = 0;
 434         gctx->pcounter = -1;
 435         gctx->generator = DH_GENERATOR_2;
 436         gctx->dh_type = type;
 437     }
 438     return gctx;
 439 }
 440
 441 static void *dh_gen_init(void *provctx, int selection)
 442 {
 443     return dh_gen_init_base(provctx, selection, DH_FLAG_TYPE_DH);
 444 }
 445
 446 static void *dhx_gen_init(void *provctx, int selection)
 447 {
 448    return dh_gen_init_base(provctx, selection, DH_FLAG_TYPE_DHX);
 449 }
 450
 451 static int dh_gen_set_template(void *genctx, void *templ)
 452 {
 453     struct dh_gen_ctx *gctx = genctx;
 454     DH *dh = templ;
 455
 456     if (!ossl_prov_is_running() || gctx == NULL || dh == NULL)
 457         return 0;
 458     gctx->ffc_params = dh_get0_params(dh);
 459     return 1;
 460 }
 461
 462 static int dh_set_gen_seed(struct dh_gen_ctx *gctx, unsigned char *seed,
 463                            size_t seedlen)
 464 {
 465     OPENSSL_clear_free(gctx->seed, gctx->seedlen);
 466     gctx->seed = NULL;
 467     gctx->seedlen = 0;
 468     if (seed != NULL && seedlen > 0) {
 469         gctx->seed = OPENSSL_memdup(seed, seedlen);
 470         if (gctx->seed == NULL)
 471             return 0;
 472         gctx->seedlen = seedlen;
 473     }
 474     return 1;
 475 }
 476
 477 static int dh_gen_set_params(void *genctx, const OSSL_PARAM params[])
 478 {
 479     struct dh_gen_ctx *gctx = genctx;
 480     const OSSL_PARAM *p;
 481
 482     if (gctx == NULL)
 483         return 0;
 484
 485     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_TYPE);
 486     if (p != NULL) {
 487         if (p->data_type != OSSL_PARAM_UTF8_STRING
 488             || ((gctx->gen_type = dh_gen_type_name2id(p->data)) == -1)) {
 489             ERR_raise(ERR_LIB_PROV, ERR_R_PASSED_INVALID_ARGUMENT);
 490             return 0;
 491         }
 492     }
 493     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_GROUP_NAME);
 494     if (p != NULL) {
 495         if (p->data_type != OSSL_PARAM_UTF8_STRING
 496            || ((gctx->group_nid = ossl_ffc_named_group_to_uid(p->data)) == NID_undef)) {
 497             ERR_raise(ERR_LIB_PROV, ERR_R_PASSED_INVALID_ARGUMENT);
 498             return 0;
 499         }
 500         gctx->gen_type = DH_PARAMGEN_TYPE_GROUP;
 501     }
 502     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_DH_GENERATOR);
 503     if (p != NULL && !OSSL_PARAM_get_int(p, &gctx->generator))
 504         return 0;
 505     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_GINDEX);
 506     if (p != NULL && !OSSL_PARAM_get_int(p, &gctx->gindex))
 507         return 0;
 508     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_PCOUNTER);
 509     if (p != NULL && !OSSL_PARAM_get_int(p, &gctx->pcounter))
 510         return 0;
 511     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_H);
 512     if (p != NULL && !OSSL_PARAM_get_int(p, &gctx->hindex))
 513         return 0;
 514     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_SEED);
 515     if (p != NULL
 516         && (p->data_type != OSSL_PARAM_OCTET_STRING
 517             || !dh_set_gen_seed(gctx, p->data, p->data_size)))
 518             return 0;
 519
 520     if ((p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_PBITS)) != NULL
 521         && !OSSL_PARAM_get_size_t(p, &gctx->pbits))
 522         return 0;
 523     if ((p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_QBITS)) != NULL
 524         && !OSSL_PARAM_get_size_t(p, &gctx->qbits))
 525         return 0;
 526     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_DIGEST);
 527     if (p != NULL) {
 528         if (p->data_type != OSSL_PARAM_UTF8_STRING)
 529             return 0;
 530         gctx->mdname = p->data;
 531     }
 532     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_DIGEST_PROPS);
 533     if (p != NULL) {
 534         if (p->data_type != OSSL_PARAM_UTF8_STRING)
 535             return 0;
 536         gctx->mdprops = p->data;
 537     }
 538     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_DH_PRIV_LEN);
 539     if (p != NULL && !OSSL_PARAM_get_int(p, &gctx->priv_len))
 540         return 0;
 541     return 1;
 542 }
 543
 544 static const OSSL_PARAM *dh_gen_settable_params(void *provctx)
 545 {
 546     static OSSL_PARAM settable[] = {
 547         OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_GROUP_NAME, NULL, 0),
 548         OSSL_PARAM_int(OSSL_PKEY_PARAM_DH_PRIV_LEN, NULL),
 549         OSSL_PARAM_int(OSSL_PKEY_PARAM_DH_GENERATOR, NULL),
 550         OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_FFC_TYPE, NULL, 0),
 551         OSSL_PARAM_size_t(OSSL_PKEY_PARAM_FFC_PBITS, NULL),
 552         OSSL_PARAM_size_t(OSSL_PKEY_PARAM_FFC_QBITS, NULL),
 553         OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_FFC_DIGEST, NULL, 0),
 554         OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_FFC_DIGEST_PROPS, NULL, 0),
 555         OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_GINDEX, NULL),
 556         OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_FFC_SEED, NULL, 0),
 557         OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_PCOUNTER, NULL),
 558         OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_H, NULL),
 559         OSSL_PARAM_END
 560     };
 561     return settable;
 562 }
 563
 564 static int dh_gencb(int p, int n, BN_GENCB *cb)
 565 {
 566     struct dh_gen_ctx *gctx = BN_GENCB_get_arg(cb);
 567     OSSL_PARAM params[] = { OSSL_PARAM_END, OSSL_PARAM_END, OSSL_PARAM_END };
 568
 569     params[0] = OSSL_PARAM_construct_int(OSSL_GEN_PARAM_POTENTIAL, &p);
 570     params[1] = OSSL_PARAM_construct_int(OSSL_GEN_PARAM_ITERATION, &n);
 571
 572     return gctx->cb(params, gctx->cbarg);
 573 }
 574
 575 static void *dh_gen(void *genctx, OSSL_CALLBACK *osslcb, void *cbarg)
 576 {
 577     int ret = 0;
 578     struct dh_gen_ctx *gctx = genctx;
 579     DH *dh = NULL;
 580     BN_GENCB *gencb = NULL;
 581     FFC_PARAMS *ffc;
 582
 583     if (!ossl_prov_is_running() || gctx == NULL)
 584         return NULL;
 585
 586     /* For parameter generation - If there is a group name just create it */
 587     if (gctx->gen_type == DH_PARAMGEN_TYPE_GROUP) {
 588         /* Select a named group if there is not one already */
 589         if (gctx->group_nid == NID_undef)
 590             gctx->group_nid = dh_get_named_group_uid_from_size(gctx->pbits);
 591         if (gctx->group_nid == NID_undef)
 592             return NULL;
 593         dh = dh_new_by_nid_ex(gctx->libctx, gctx->group_nid);
 594         if (dh == NULL)
 595             return NULL;
 596         ffc = dh_get0_params(dh);
 597     } else {
 598         dh = dh_new_ex(gctx->libctx);
 599         if (dh == NULL)
 600             return NULL;
 601         ffc = dh_get0_params(dh);
 602
 603         /* Copy the template value if one was passed */
 604         if (gctx->ffc_params != NULL
 605             && !ossl_ffc_params_copy(ffc, gctx->ffc_params))
 606             goto end;
 607
 608         if (!ossl_ffc_params_set_seed(ffc, gctx->seed, gctx->seedlen))
 609             goto end;
 610         if (gctx->gindex != -1) {
 611             ossl_ffc_params_set_gindex(ffc, gctx->gindex);
 612             if (gctx->pcounter != -1)
 613                 ossl_ffc_params_set_pcounter(ffc, gctx->pcounter);
 614         } else if (gctx->hindex != 0) {
 615             ossl_ffc_params_set_h(ffc, gctx->hindex);
 616         }
 617         if (gctx->mdname != NULL) {
 618             if (!ossl_ffc_set_digest(ffc, gctx->mdname, gctx->mdprops))
 619                 goto end;
 620         }
 621         gctx->cb = osslcb;
 622         gctx->cbarg = cbarg;
 623         gencb = BN_GENCB_new();
 624         if (gencb != NULL)
 625             BN_GENCB_set(gencb, dh_gencb, genctx);
 626
 627         if ((gctx->selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0) {
 628             /*
 629              * NOTE: The old safe prime generator code is not used in fips mode,
 630              * (i.e internally it ignores the generator and chooses a named
 631              * group based on pbits.
 632              */
 633             if (gctx->gen_type == DH_PARAMGEN_TYPE_GENERATOR)
 634                 ret = DH_generate_parameters_ex(dh, gctx->pbits,
 635                                                 gctx->generator, gencb);
 636             else
 637                 ret = dh_generate_ffc_parameters(dh, gctx->gen_type, gctx->pbits,
 638                                                  gctx->qbits, gencb);
 639             if (ret <= 0)
 640                 goto end;
 641         }
 642     }
 643
 644     if ((gctx->selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0) {
 645         if (ffc->p == NULL || ffc->g == NULL)
 646             goto end;
 647         if (gctx->priv_len > 0)
 648             DH_set_length(dh, (long)gctx->priv_len);
 649         ossl_ffc_params_enable_flags(ffc, FFC_PARAM_FLAG_VALIDATE_LEGACY,
 650                                      gctx->gen_type == DH_PARAMGEN_TYPE_FIPS_186_2);
 651         if (DH_generate_key(dh) <= 0)
 652             goto end;
 653     }
 654     DH_clear_flags(dh, DH_FLAG_TYPE_MASK);
 655     DH_set_flags(dh, gctx->dh_type);
 656
 657     ret = 1;
 658 end:
 659     if (ret <= 0) {
 660         DH_free(dh);
 661         dh = NULL;
 662     }
 663     BN_GENCB_free(gencb);
 664     return dh;
 665 }
 666
 667 static void dh_gen_cleanup(void *genctx)
 668 {
 669     struct dh_gen_ctx *gctx = genctx;
 670
 671     if (gctx == NULL)
 672         return;
 673
 674     OPENSSL_clear_free(gctx->seed, gctx->seedlen);
 675     OPENSSL_free(gctx);
 676 }
 677
 678 void *dh_load(const void *reference, size_t reference_sz)
 679 {
 680     DH *dh = NULL;
 681
 682     if (ossl_prov_is_running() && reference_sz == sizeof(dh)) {
 683         /* The contents of the reference is the address to our object */
 684         dh = *(DH **)reference;
 685         /* We grabbed, so we detach it */
 686         *(DH **)reference = NULL;
 687         return dh;
 688     }
 689     return NULL;
 690 }
 691
 692 const OSSL_DISPATCH ossl_dh_keymgmt_functions[] = {
 693     { OSSL_FUNC_KEYMGMT_NEW, (void (*)(void))dh_newdata },
 694     { OSSL_FUNC_KEYMGMT_GEN_INIT, (void (*)(void))dh_gen_init },
 695     { OSSL_FUNC_KEYMGMT_GEN_SET_TEMPLATE, (void (*)(void))dh_gen_set_template },
 696     { OSSL_FUNC_KEYMGMT_GEN_SET_PARAMS, (void (*)(void))dh_gen_set_params },
 697     { OSSL_FUNC_KEYMGMT_GEN_SETTABLE_PARAMS,
 698       (void (*)(void))dh_gen_settable_params },
 699     { OSSL_FUNC_KEYMGMT_GEN, (void (*)(void))dh_gen },
 700     { OSSL_FUNC_KEYMGMT_GEN_CLEANUP, (void (*)(void))dh_gen_cleanup },
 701     { OSSL_FUNC_KEYMGMT_LOAD, (void (*)(void))dh_load },
 702     { OSSL_FUNC_KEYMGMT_FREE, (void (*)(void))dh_freedata },
 703     { OSSL_FUNC_KEYMGMT_GET_PARAMS, (void (*) (void))dh_get_params },
 704     { OSSL_FUNC_KEYMGMT_GETTABLE_PARAMS, (void (*) (void))dh_gettable_params },
 705     { OSSL_FUNC_KEYMGMT_SET_PARAMS, (void (*) (void))dh_set_params },
 706     { OSSL_FUNC_KEYMGMT_SETTABLE_PARAMS, (void (*) (void))dh_settable_params },
 707     { OSSL_FUNC_KEYMGMT_HAS, (void (*)(void))dh_has },
 708     { OSSL_FUNC_KEYMGMT_MATCH, (void (*)(void))dh_match },
 709     { OSSL_FUNC_KEYMGMT_VALIDATE, (void (*)(void))dh_validate },
 710     { OSSL_FUNC_KEYMGMT_IMPORT, (void (*)(void))dh_import },
 711     { OSSL_FUNC_KEYMGMT_IMPORT_TYPES, (void (*)(void))dh_import_types },
 712     { OSSL_FUNC_KEYMGMT_EXPORT, (void (*)(void))dh_export },
 713     { OSSL_FUNC_KEYMGMT_EXPORT_TYPES, (void (*)(void))dh_export_types },
 714     { 0, NULL }
 715 };
 716
 717 /* For any DH key, we use the "DH" algorithms regardless of sub-type. */
 718 static const char *dhx_query_operation_name(int operation_id)
 719 {
 720     return "DH";
 721 }
 722
 723 const OSSL_DISPATCH ossl_dhx_keymgmt_functions[] = {
 724     { OSSL_FUNC_KEYMGMT_NEW, (void (*)(void))dhx_newdata },
 725     { OSSL_FUNC_KEYMGMT_GEN_INIT, (void (*)(void))dhx_gen_init },
 726     { OSSL_FUNC_KEYMGMT_GEN_SET_TEMPLATE, (void (*)(void))dh_gen_set_template },
 727     { OSSL_FUNC_KEYMGMT_GEN_SET_PARAMS, (void (*)(void))dh_gen_set_params },
 728     { OSSL_FUNC_KEYMGMT_GEN_SETTABLE_PARAMS,
 729       (void (*)(void))dh_gen_settable_params },
 730     { OSSL_FUNC_KEYMGMT_GEN, (void (*)(void))dh_gen },
 731     { OSSL_FUNC_KEYMGMT_GEN_CLEANUP, (void (*)(void))dh_gen_cleanup },
 732     { OSSL_FUNC_KEYMGMT_LOAD, (void (*)(void))dh_load },
 733     { OSSL_FUNC_KEYMGMT_FREE, (void (*)(void))dh_freedata },
 734     { OSSL_FUNC_KEYMGMT_GET_PARAMS, (void (*) (void))dh_get_params },
 735     { OSSL_FUNC_KEYMGMT_GETTABLE_PARAMS, (void (*) (void))dh_gettable_params },
 736     { OSSL_FUNC_KEYMGMT_SET_PARAMS, (void (*) (void))dh_set_params },
 737     { OSSL_FUNC_KEYMGMT_SETTABLE_PARAMS, (void (*) (void))dh_settable_params },
 738     { OSSL_FUNC_KEYMGMT_HAS, (void (*)(void))dh_has },
 739     { OSSL_FUNC_KEYMGMT_MATCH, (void (*)(void))dh_match },
 740     { OSSL_FUNC_KEYMGMT_VALIDATE, (void (*)(void))dh_validate },
 741     { OSSL_FUNC_KEYMGMT_IMPORT, (void (*)(void))dh_import },
 742     { OSSL_FUNC_KEYMGMT_IMPORT_TYPES, (void (*)(void))dh_import_types },
 743     { OSSL_FUNC_KEYMGMT_EXPORT, (void (*)(void))dh_export },
 744     { OSSL_FUNC_KEYMGMT_EXPORT_TYPES, (void (*)(void))dh_export_types },
 745     { OSSL_FUNC_KEYMGMT_QUERY_OPERATION_NAME,
 746       (void (*)(void))dhx_query_operation_name },
 747     { 0, NULL }
 748 };