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 #include "internal/param_build_set.h"
  28
  29 static OSSL_FUNC_keymgmt_new_fn dh_newdata;
  30 static OSSL_FUNC_keymgmt_free_fn dh_freedata;
  31 static OSSL_FUNC_keymgmt_gen_init_fn dh_gen_init;
  32 static OSSL_FUNC_keymgmt_gen_init_fn dhx_gen_init;
  33 static OSSL_FUNC_keymgmt_gen_set_template_fn dh_gen_set_template;
  34 static OSSL_FUNC_keymgmt_gen_set_params_fn dh_gen_set_params;
  35 static OSSL_FUNC_keymgmt_gen_settable_params_fn dh_gen_settable_params;
  36 static OSSL_FUNC_keymgmt_gen_fn dh_gen;
  37 static OSSL_FUNC_keymgmt_gen_cleanup_fn dh_gen_cleanup;
  38 static OSSL_FUNC_keymgmt_load_fn dh_load;
  39 static OSSL_FUNC_keymgmt_get_params_fn dh_get_params;
  40 static OSSL_FUNC_keymgmt_gettable_params_fn dh_gettable_params;
  41 static OSSL_FUNC_keymgmt_set_params_fn dh_set_params;
  42 static OSSL_FUNC_keymgmt_settable_params_fn dh_settable_params;
  43 static OSSL_FUNC_keymgmt_has_fn dh_has;
  44 static OSSL_FUNC_keymgmt_match_fn dh_match;
  45 static OSSL_FUNC_keymgmt_validate_fn dh_validate;
  46 static OSSL_FUNC_keymgmt_import_fn dh_import;
  47 static OSSL_FUNC_keymgmt_import_types_fn dh_import_types;
  48 static OSSL_FUNC_keymgmt_export_fn dh_export;
  49 static OSSL_FUNC_keymgmt_export_types_fn dh_export_types;
  50
  51 #define DH_POSSIBLE_SELECTIONS                                                 \
  52     (OSSL_KEYMGMT_SELECT_KEYPAIR | OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS)
  53
  54 struct dh_gen_ctx {
  55     OPENSSL_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     const char *mdname;
  74     const char *mdprops;
  75     OSSL_CALLBACK *cb;
  76     void *cbarg;
  77     int dh_type;
  78 };
  79
  80 typedef struct dh_name2id_st{
  81     const char *name;
  82     int id;
  83 } DH_GENTYPE_NAME2ID;
  84
  85 static const DH_GENTYPE_NAME2ID dhtype2id[]=
  86 {
  87     { "default", DH_PARAMGEN_TYPE_FIPS_186_4 },
  88     { "fips186_4", DH_PARAMGEN_TYPE_FIPS_186_4 },
  89     { "fips186_2", DH_PARAMGEN_TYPE_FIPS_186_2 },
  90     { "group", DH_PARAMGEN_TYPE_GROUP },
  91     { "generator", DH_PARAMGEN_TYPE_GENERATOR }
  92 };
  93
  94 const char *dh_gen_type_id2name(int id)
  95 {
  96     size_t i;
  97
  98     for (i = 0; i < OSSL_NELEM(dhtype2id); ++i) {
  99         if (dhtype2id[i].id == id)
 100             return dhtype2id[i].name;
 101     }
 102     return NULL;
 103 }
 104
 105 static int dh_gen_type_name2id(const char *name)
 106 {
 107     size_t i;
 108
 109     for (i = 0; i < OSSL_NELEM(dhtype2id); ++i) {
 110         if (strcmp(dhtype2id[i].name, name) == 0)
 111             return dhtype2id[i].id;
 112     }
 113     return -1;
 114 }
 115
 116 static int dh_key_todata(DH *dh, OSSL_PARAM_BLD *bld, OSSL_PARAM params[])
 117 {
 118     const BIGNUM *priv = NULL, *pub = NULL;
 119
 120     if (dh == NULL)
 121         return 0;
 122
 123     DH_get0_key(dh, &pub, &priv);
 124     if (priv != NULL
 125         && !ossl_param_build_set_bn(bld, params, OSSL_PKEY_PARAM_PRIV_KEY, priv))
 126         return 0;
 127     if (pub != NULL
 128         && !ossl_param_build_set_bn(bld, params, OSSL_PKEY_PARAM_PUB_KEY, pub))
 129         return 0;
 130
 131     return 1;
 132 }
 133
 134 static void *dh_newdata(void *provctx)
 135 {
 136     DH *dh = NULL;
 137
 138     if (ossl_prov_is_running()) {
 139         dh = dh_new_ex(PROV_LIBRARY_CONTEXT_OF(provctx));
 140         if (dh != NULL) {
 141             DH_clear_flags(dh, DH_FLAG_TYPE_MASK);
 142             DH_set_flags(dh, DH_FLAG_TYPE_DH);
 143         }
 144     }
 145     return dh;
 146 }
 147
 148 static void *dhx_newdata(void *provctx)
 149 {
 150     DH *dh = NULL;
 151
 152     dh = dh_new_ex(PROV_LIBRARY_CONTEXT_OF(provctx));
 153     if (dh != NULL) {
 154         DH_clear_flags(dh, DH_FLAG_TYPE_MASK);
 155         DH_set_flags(dh, DH_FLAG_TYPE_DHX);
 156     }
 157     return dh;
 158 }
 159
 160 static void dh_freedata(void *keydata)
 161 {
 162     DH_free(keydata);
 163 }
 164
 165 static int dh_has(void *keydata, int selection)
 166 {
 167     DH *dh = keydata;
 168     int ok = 0;
 169
 170     if (ossl_prov_is_running() && dh != NULL) {
 171         if ((selection & DH_POSSIBLE_SELECTIONS) != 0)
 172             ok = 1;
 173
 174         if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
 175             ok = ok && (DH_get0_pub_key(dh) != NULL);
 176         if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 177             ok = ok && (DH_get0_priv_key(dh) != NULL);
 178         if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
 179             ok = ok && (DH_get0_p(dh) != NULL && DH_get0_g(dh) != NULL);
 180     }
 181     return ok;
 182 }
 183
 184 static int dh_match(const void *keydata1, const void *keydata2, int selection)
 185 {
 186     const DH *dh1 = keydata1;
 187     const DH *dh2 = keydata2;
 188     int ok = 1;
 189
 190     if (!ossl_prov_is_running())
 191         return 0;
 192
 193     if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
 194         ok = ok && BN_cmp(DH_get0_pub_key(dh1), DH_get0_pub_key(dh2)) == 0;
 195     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 196         ok = ok && BN_cmp(DH_get0_priv_key(dh1), DH_get0_priv_key(dh2)) == 0;
 197     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0) {
 198         FFC_PARAMS *dhparams1 = dh_get0_params((DH *)dh1);
 199         FFC_PARAMS *dhparams2 = dh_get0_params((DH *)dh2);
 200
 201         ok = ok && ossl_ffc_params_cmp(dhparams1, dhparams2, 1);
 202     }
 203     return ok;
 204 }
 205
 206 static int dh_import(void *keydata, int selection, const OSSL_PARAM params[])
 207 {
 208     DH *dh = keydata;
 209     int ok = 1;
 210
 211     if (!ossl_prov_is_running() || dh == NULL)
 212         return 0;
 213
 214     if ((selection & DH_POSSIBLE_SELECTIONS) == 0)
 215         return 0;
 216
 217     if ((selection & OSSL_KEYMGMT_SELECT_ALL_PARAMETERS) != 0)
 218         ok = ok && dh_ffc_params_fromdata(dh, params);
 219
 220     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
 221         ok = ok && dh_key_fromdata(dh, params);
 222
 223     return ok;
 224 }
 225
 226 static int dh_export(void *keydata, int selection, OSSL_CALLBACK *param_cb,
 227                      void *cbarg)
 228 {
 229     DH *dh = keydata;
 230     OSSL_PARAM_BLD *tmpl = NULL;
 231     OSSL_PARAM *params = NULL;
 232     int ok = 1;
 233
 234     if (!ossl_prov_is_running() || dh == NULL)
 235         return 0;
 236
 237     tmpl = OSSL_PARAM_BLD_new();
 238     if (tmpl == NULL)
 239         return 0;
 240
 241     if ((selection & OSSL_KEYMGMT_SELECT_ALL_PARAMETERS) != 0)
 242         ok = ok && ossl_ffc_params_todata(dh_get0_params(dh), tmpl, NULL);
 243     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
 244         ok = ok && dh_key_todata(dh, tmpl, NULL);
 245
 246     if (!ok
 247         || (params = OSSL_PARAM_BLD_to_param(tmpl)) == NULL) {
 248         ok = 0;
 249         goto err;
 250     }
 251     ok = param_cb(params, cbarg);
 252     OSSL_PARAM_BLD_free_params(params);
 253 err:
 254     OSSL_PARAM_BLD_free(tmpl);
 255     return ok;
 256 }
 257
 258 /* IMEXPORT = IMPORT + EXPORT */
 259
 260 # define DH_IMEXPORTABLE_PARAMETERS                                            \
 261     OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_P, NULL, 0),                             \
 262     OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_Q, NULL, 0),                             \
 263     OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_G, NULL, 0),                             \
 264     OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_COFACTOR, NULL, 0),                      \
 265     OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_GINDEX, NULL),                          \
 266     OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_PCOUNTER, NULL),                        \
 267     OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_H, NULL),                               \
 268     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_FFC_SEED, NULL, 0),                \
 269     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_GROUP_NAME, NULL, 0)
 270 # define DH_IMEXPORTABLE_PUBLIC_KEY                                            \
 271     OSSL_PARAM_BN(OSSL_PKEY_PARAM_PUB_KEY, NULL, 0)
 272 # define DH_IMEXPORTABLE_PRIVATE_KEY                                           \
 273     OSSL_PARAM_BN(OSSL_PKEY_PARAM_PRIV_KEY, NULL, 0)
 274 static const OSSL_PARAM dh_all_types[] = {
 275     DH_IMEXPORTABLE_PARAMETERS,
 276     DH_IMEXPORTABLE_PUBLIC_KEY,
 277     DH_IMEXPORTABLE_PRIVATE_KEY,
 278     OSSL_PARAM_END
 279 };
 280 static const OSSL_PARAM dh_parameter_types[] = {
 281     DH_IMEXPORTABLE_PARAMETERS,
 282     OSSL_PARAM_END
 283 };
 284 static const OSSL_PARAM dh_key_types[] = {
 285     DH_IMEXPORTABLE_PUBLIC_KEY,
 286     DH_IMEXPORTABLE_PRIVATE_KEY,
 287     OSSL_PARAM_END
 288 };
 289 static const OSSL_PARAM *dh_types[] = {
 290     NULL,                        /* Index 0 = none of them */
 291     dh_parameter_types,          /* Index 1 = parameter types */
 292     dh_key_types,                /* Index 2 = key types */
 293     dh_all_types                 /* Index 3 = 1 + 2 */
 294 };
 295
 296 static const OSSL_PARAM *dh_imexport_types(int selection)
 297 {
 298     int type_select = 0;
 299
 300     if ((selection & OSSL_KEYMGMT_SELECT_ALL_PARAMETERS) != 0)
 301         type_select += 1;
 302     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
 303         type_select += 2;
 304     return dh_types[type_select];
 305 }
 306
 307 static const OSSL_PARAM *dh_import_types(int selection)
 308 {
 309     return dh_imexport_types(selection);
 310 }
 311
 312 static const OSSL_PARAM *dh_export_types(int selection)
 313 {
 314     return dh_imexport_types(selection);
 315 }
 316
 317 static ossl_inline int dh_get_params(void *key, OSSL_PARAM params[])
 318 {
 319     DH *dh = key;
 320     OSSL_PARAM *p;
 321
 322     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_BITS)) != NULL
 323         && !OSSL_PARAM_set_int(p, DH_bits(dh)))
 324         return 0;
 325     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_SECURITY_BITS)) != NULL
 326         && !OSSL_PARAM_set_int(p, DH_security_bits(dh)))
 327         return 0;
 328     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_MAX_SIZE)) != NULL
 329         && !OSSL_PARAM_set_int(p, DH_size(dh)))
 330         return 0;
 331     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_TLS_ENCODED_PT)) != NULL) {
 332         if (p->data_type != OSSL_PARAM_OCTET_STRING)
 333             return 0;
 334         p->return_size = dh_key2buf(dh, (unsigned char **)&p->data,
 335                                     p->data_size, 0);
 336         if (p->return_size == 0)
 337             return 0;
 338     }
 339
 340     return ossl_ffc_params_todata(dh_get0_params(dh), NULL, params)
 341            && dh_key_todata(dh, NULL, params);
 342 }
 343
 344 static const OSSL_PARAM dh_params[] = {
 345     OSSL_PARAM_int(OSSL_PKEY_PARAM_BITS, NULL),
 346     OSSL_PARAM_int(OSSL_PKEY_PARAM_SECURITY_BITS, NULL),
 347     OSSL_PARAM_int(OSSL_PKEY_PARAM_MAX_SIZE, NULL),
 348     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_TLS_ENCODED_PT, NULL, 0),
 349     DH_IMEXPORTABLE_PARAMETERS,
 350     DH_IMEXPORTABLE_PUBLIC_KEY,
 351     DH_IMEXPORTABLE_PRIVATE_KEY,
 352     OSSL_PARAM_END
 353 };
 354
 355 static const OSSL_PARAM *dh_gettable_params(void *provctx)
 356 {
 357     return dh_params;
 358 }
 359
 360 static const OSSL_PARAM dh_known_settable_params[] = {
 361     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_TLS_ENCODED_PT, NULL, 0),
 362     OSSL_PARAM_END
 363 };
 364
 365 static const OSSL_PARAM *dh_settable_params(void *provctx)
 366 {
 367     return dh_known_settable_params;
 368 }
 369
 370 static int dh_set_params(void *key, const OSSL_PARAM params[])
 371 {
 372     DH *dh = key;
 373     const OSSL_PARAM *p;
 374
 375     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_TLS_ENCODED_PT);
 376     if (p != NULL
 377             && (p->data_type != OSSL_PARAM_OCTET_STRING
 378                 || !dh_buf2key(dh, p->data, p->data_size)))
 379         return 0;
 380
 381     return 1;
 382 }
 383
 384 static int dh_validate_public(DH *dh)
 385 {
 386     const BIGNUM *pub_key = NULL;
 387
 388     DH_get0_key(dh, &pub_key, NULL);
 389     if (pub_key == NULL)
 390         return 0;
 391     return DH_check_pub_key_ex(dh, pub_key);
 392 }
 393
 394 static int dh_validate_private(DH *dh)
 395 {
 396     int status = 0;
 397     const BIGNUM *priv_key = NULL;
 398
 399     DH_get0_key(dh, NULL, &priv_key);
 400     if (priv_key == NULL)
 401         return 0;
 402     return dh_check_priv_key(dh, priv_key, &status);;
 403 }
 404
 405 static int dh_validate(void *keydata, int selection)
 406 {
 407     DH *dh = keydata;
 408     int ok = 0;
 409
 410     if (!ossl_prov_is_running())
 411         return 0;
 412
 413     if ((selection & DH_POSSIBLE_SELECTIONS) != 0)
 414         ok = 1;
 415
 416     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
 417         ok = ok && DH_check_params_ex(dh);
 418
 419     if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
 420         ok = ok && dh_validate_public(dh);
 421
 422     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 423         ok = ok && dh_validate_private(dh);
 424
 425     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR)
 426             == OSSL_KEYMGMT_SELECT_KEYPAIR)
 427         ok = ok && dh_check_pairwise(dh);
 428     return ok;
 429 }
 430
 431 static void *dh_gen_init_base(void *provctx, int selection, int type)
 432 {
 433     OPENSSL_CTX *libctx = PROV_LIBRARY_CONTEXT_OF(provctx);
 434     struct dh_gen_ctx *gctx = NULL;
 435
 436     if (!ossl_prov_is_running())
 437         return NULL;
 438
 439     if ((selection & (OSSL_KEYMGMT_SELECT_KEYPAIR
 440                       | OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS)) == 0)
 441         return NULL;
 442
 443     if ((gctx = OPENSSL_zalloc(sizeof(*gctx))) != NULL) {
 444         gctx->selection = selection;
 445         gctx->libctx = libctx;
 446         gctx->pbits = 2048;
 447         gctx->qbits = 224;
 448         gctx->mdname = NULL;
 449         gctx->gen_type = DH_PARAMGEN_TYPE_FIPS_186_4;
 450         gctx->gindex = -1;
 451         gctx->hindex = 0;
 452         gctx->pcounter = -1;
 453         gctx->generator = DH_GENERATOR_2;
 454         gctx->dh_type = type;
 455     }
 456     return gctx;
 457 }
 458
 459 static void *dh_gen_init(void *provctx, int selection)
 460 {
 461     return dh_gen_init_base(provctx, selection, DH_FLAG_TYPE_DH);
 462 }
 463
 464 static void *dhx_gen_init(void *provctx, int selection)
 465 {
 466    return dh_gen_init_base(provctx, selection, DH_FLAG_TYPE_DHX);
 467 }
 468
 469 static int dh_gen_set_template(void *genctx, void *templ)
 470 {
 471     struct dh_gen_ctx *gctx = genctx;
 472     DH *dh = templ;
 473
 474     if (!ossl_prov_is_running() || gctx == NULL || dh == NULL)
 475         return 0;
 476     gctx->ffc_params = dh_get0_params(dh);
 477     return 1;
 478 }
 479
 480 static int dh_set_gen_seed(struct dh_gen_ctx *gctx, unsigned char *seed,
 481                            size_t seedlen)
 482 {
 483     OPENSSL_clear_free(gctx->seed, gctx->seedlen);
 484     gctx->seed = NULL;
 485     gctx->seedlen = 0;
 486     if (seed != NULL && seedlen > 0) {
 487         gctx->seed = OPENSSL_memdup(seed, seedlen);
 488         if (gctx->seed == NULL)
 489             return 0;
 490         gctx->seedlen = seedlen;
 491     }
 492     return 1;
 493 }
 494
 495 static int dh_gen_set_params(void *genctx, const OSSL_PARAM params[])
 496 {
 497     struct dh_gen_ctx *gctx = genctx;
 498     const OSSL_PARAM *p;
 499
 500     if (gctx == NULL)
 501         return 0;
 502
 503     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_TYPE);
 504     if (p != NULL) {
 505         if (p->data_type != OSSL_PARAM_UTF8_STRING
 506             || ((gctx->gen_type = dh_gen_type_name2id(p->data)) == -1)) {
 507             ERR_raise(ERR_LIB_PROV, ERR_R_PASSED_INVALID_ARGUMENT);
 508             return 0;
 509         }
 510     }
 511     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_GROUP_NAME);
 512     if (p != NULL) {
 513         if (p->data_type != OSSL_PARAM_UTF8_STRING
 514            || ((gctx->group_nid = ossl_ffc_named_group_to_uid(p->data)) == NID_undef)) {
 515             ERR_raise(ERR_LIB_PROV, ERR_R_PASSED_INVALID_ARGUMENT);
 516             return 0;
 517         }
 518         gctx->gen_type = DH_PARAMGEN_TYPE_GROUP;
 519     }
 520     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_DH_GENERATOR);
 521     if (p != NULL && !OSSL_PARAM_get_int(p, &gctx->generator))
 522         return 0;
 523     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_GINDEX);
 524     if (p != NULL && !OSSL_PARAM_get_int(p, &gctx->gindex))
 525         return 0;
 526     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_PCOUNTER);
 527     if (p != NULL && !OSSL_PARAM_get_int(p, &gctx->pcounter))
 528         return 0;
 529     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_H);
 530     if (p != NULL && !OSSL_PARAM_get_int(p, &gctx->hindex))
 531         return 0;
 532     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_SEED);
 533     if (p != NULL
 534         && (p->data_type != OSSL_PARAM_OCTET_STRING
 535             || !dh_set_gen_seed(gctx, p->data, p->data_size)))
 536             return 0;
 537
 538     if ((p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_PBITS)) != NULL
 539         && !OSSL_PARAM_get_size_t(p, &gctx->pbits))
 540         return 0;
 541     if ((p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_QBITS)) != NULL
 542         && !OSSL_PARAM_get_size_t(p, &gctx->qbits))
 543         return 0;
 544     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_DIGEST);
 545     if (p != NULL) {
 546         if (p->data_type != OSSL_PARAM_UTF8_STRING)
 547             return 0;
 548         gctx->mdname = p->data;
 549     }
 550     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_DIGEST_PROPS);
 551     if (p != NULL) {
 552         if (p->data_type != OSSL_PARAM_UTF8_STRING)
 553             return 0;
 554         gctx->mdprops = p->data;
 555     }
 556     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_DH_PRIV_LEN);
 557     if (p != NULL && !OSSL_PARAM_get_int(p, &gctx->priv_len))
 558         return 0;
 559     return 1;
 560 }
 561
 562 static const OSSL_PARAM *dh_gen_settable_params(void *provctx)
 563 {
 564     static OSSL_PARAM settable[] = {
 565         OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_GROUP_NAME, NULL, 0),
 566         OSSL_PARAM_int(OSSL_PKEY_PARAM_DH_PRIV_LEN, NULL),
 567         OSSL_PARAM_int(OSSL_PKEY_PARAM_DH_GENERATOR, NULL),
 568         OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_FFC_TYPE, NULL, 0),
 569         OSSL_PARAM_size_t(OSSL_PKEY_PARAM_FFC_PBITS, NULL),
 570         OSSL_PARAM_size_t(OSSL_PKEY_PARAM_FFC_QBITS, NULL),
 571         OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_FFC_DIGEST, NULL, 0),
 572         OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_FFC_DIGEST_PROPS, NULL, 0),
 573         OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_GINDEX, NULL),
 574         OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_FFC_SEED, NULL, 0),
 575         OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_PCOUNTER, NULL),
 576         OSSL_PARAM_int(OSSL_PKEY_PARAM_FFC_H, NULL),
 577         OSSL_PARAM_END
 578     };
 579     return settable;
 580 }
 581
 582 static int dh_gencb(int p, int n, BN_GENCB *cb)
 583 {
 584     struct dh_gen_ctx *gctx = BN_GENCB_get_arg(cb);
 585     OSSL_PARAM params[] = { OSSL_PARAM_END, OSSL_PARAM_END, OSSL_PARAM_END };
 586
 587     params[0] = OSSL_PARAM_construct_int(OSSL_GEN_PARAM_POTENTIAL, &p);
 588     params[1] = OSSL_PARAM_construct_int(OSSL_GEN_PARAM_ITERATION, &n);
 589
 590     return gctx->cb(params, gctx->cbarg);
 591 }
 592
 593 static void *dh_gen(void *genctx, OSSL_CALLBACK *osslcb, void *cbarg)
 594 {
 595     int ret = 0;
 596     struct dh_gen_ctx *gctx = genctx;
 597     DH *dh = NULL;
 598     BN_GENCB *gencb = NULL;
 599     FFC_PARAMS *ffc;
 600
 601     if (!ossl_prov_is_running() || gctx == NULL)
 602         return NULL;
 603
 604     /* For parameter generation - If there is a group name just create it */
 605     if (gctx->gen_type == DH_PARAMGEN_TYPE_GROUP) {
 606         /* Select a named group if there is not one already */
 607         if (gctx->group_nid == NID_undef)
 608             gctx->group_nid = dh_get_named_group_uid_from_size(gctx->pbits);
 609         if (gctx->group_nid == NID_undef)
 610             return NULL;
 611         dh = dh_new_by_nid_ex(gctx->libctx, gctx->group_nid);
 612         if (dh == NULL)
 613             return NULL;
 614         ffc = dh_get0_params(dh);
 615     } else {
 616         dh = dh_new_ex(gctx->libctx);
 617         if (dh == NULL)
 618             return NULL;
 619         ffc = dh_get0_params(dh);
 620
 621         /* Copy the template value if one was passed */
 622         if (gctx->ffc_params != NULL
 623             && !ossl_ffc_params_copy(ffc, gctx->ffc_params))
 624             goto end;
 625
 626         if (!ossl_ffc_params_set_seed(ffc, gctx->seed, gctx->seedlen))
 627             goto end;
 628         if (gctx->gindex != -1) {
 629             ossl_ffc_params_set_gindex(ffc, gctx->gindex);
 630             if (gctx->pcounter != -1)
 631                 ossl_ffc_params_set_pcounter(ffc, gctx->pcounter);
 632         } else if (gctx->hindex != 0) {
 633             ossl_ffc_params_set_h(ffc, gctx->hindex);
 634         }
 635         if (gctx->mdname != NULL) {
 636             if (!ossl_ffc_set_digest(ffc, gctx->mdname, gctx->mdprops))
 637                 goto end;
 638         }
 639         gctx->cb = osslcb;
 640         gctx->cbarg = cbarg;
 641         gencb = BN_GENCB_new();
 642         if (gencb != NULL)
 643             BN_GENCB_set(gencb, dh_gencb, genctx);
 644
 645         if ((gctx->selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0) {
 646             /*
 647              * NOTE: The old safe prime generator code is not used in fips mode,
 648              * (i.e internally it ignores the generator and chooses a named
 649              * group based on pbits.
 650              */
 651             if (gctx->gen_type == DH_PARAMGEN_TYPE_GENERATOR)
 652                 ret = DH_generate_parameters_ex(dh, gctx->pbits,
 653                                                 gctx->generator, gencb);
 654             else
 655                 ret = dh_generate_ffc_parameters(dh, gctx->gen_type, gctx->pbits,
 656                                                  gctx->qbits, gencb);
 657             if (ret <= 0)
 658                 goto end;
 659         }
 660     }
 661
 662     if ((gctx->selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0) {
 663         if (ffc->p == NULL || ffc->g == NULL)
 664             goto end;
 665         if (gctx->priv_len > 0)
 666             DH_set_length(dh, (long)gctx->priv_len);
 667         ossl_ffc_params_enable_flags(ffc, FFC_PARAM_FLAG_VALIDATE_LEGACY,
 668                                      gctx->gen_type == DH_PARAMGEN_TYPE_FIPS_186_2);
 669         if (DH_generate_key(dh) <= 0)
 670             goto end;
 671     }
 672     DH_clear_flags(dh, DH_FLAG_TYPE_MASK);
 673     DH_set_flags(dh, gctx->dh_type);
 674
 675     ret = 1;
 676 end:
 677     if (ret <= 0) {
 678         DH_free(dh);
 679         dh = NULL;
 680     }
 681     BN_GENCB_free(gencb);
 682     return dh;
 683 }
 684
 685 static void dh_gen_cleanup(void *genctx)
 686 {
 687     struct dh_gen_ctx *gctx = genctx;
 688
 689     if (gctx == NULL)
 690         return;
 691
 692     OPENSSL_clear_free(gctx->seed, gctx->seedlen);
 693     OPENSSL_free(gctx);
 694 }
 695
 696 void *dh_load(const void *reference, size_t reference_sz)
 697 {
 698     DH *dh = NULL;
 699
 700     if (ossl_prov_is_running() && reference_sz == sizeof(dh)) {
 701         /* The contents of the reference is the address to our object */
 702         dh = *(DH **)reference;
 703         /* We grabbed, so we detach it */
 704         *(DH **)reference = NULL;
 705         return dh;
 706     }
 707     return NULL;
 708 }
 709
 710 const OSSL_DISPATCH ossl_dh_keymgmt_functions[] = {
 711     { OSSL_FUNC_KEYMGMT_NEW, (void (*)(void))dh_newdata },
 712     { OSSL_FUNC_KEYMGMT_GEN_INIT, (void (*)(void))dh_gen_init },
 713     { OSSL_FUNC_KEYMGMT_GEN_SET_TEMPLATE, (void (*)(void))dh_gen_set_template },
 714     { OSSL_FUNC_KEYMGMT_GEN_SET_PARAMS, (void (*)(void))dh_gen_set_params },
 715     { OSSL_FUNC_KEYMGMT_GEN_SETTABLE_PARAMS,
 716       (void (*)(void))dh_gen_settable_params },
 717     { OSSL_FUNC_KEYMGMT_GEN, (void (*)(void))dh_gen },
 718     { OSSL_FUNC_KEYMGMT_GEN_CLEANUP, (void (*)(void))dh_gen_cleanup },
 719     { OSSL_FUNC_KEYMGMT_LOAD, (void (*)(void))dh_load },
 720     { OSSL_FUNC_KEYMGMT_FREE, (void (*)(void))dh_freedata },
 721     { OSSL_FUNC_KEYMGMT_GET_PARAMS, (void (*) (void))dh_get_params },
 722     { OSSL_FUNC_KEYMGMT_GETTABLE_PARAMS, (void (*) (void))dh_gettable_params },
 723     { OSSL_FUNC_KEYMGMT_SET_PARAMS, (void (*) (void))dh_set_params },
 724     { OSSL_FUNC_KEYMGMT_SETTABLE_PARAMS, (void (*) (void))dh_settable_params },
 725     { OSSL_FUNC_KEYMGMT_HAS, (void (*)(void))dh_has },
 726     { OSSL_FUNC_KEYMGMT_MATCH, (void (*)(void))dh_match },
 727     { OSSL_FUNC_KEYMGMT_VALIDATE, (void (*)(void))dh_validate },
 728     { OSSL_FUNC_KEYMGMT_IMPORT, (void (*)(void))dh_import },
 729     { OSSL_FUNC_KEYMGMT_IMPORT_TYPES, (void (*)(void))dh_import_types },
 730     { OSSL_FUNC_KEYMGMT_EXPORT, (void (*)(void))dh_export },
 731     { OSSL_FUNC_KEYMGMT_EXPORT_TYPES, (void (*)(void))dh_export_types },
 732     { 0, NULL }
 733 };
 734
 735 /* For any DH key, we use the "DH" algorithms regardless of sub-type. */
 736 static const char *dhx_query_operation_name(int operation_id)
 737 {
 738     return "DH";
 739 }
 740
 741 const OSSL_DISPATCH ossl_dhx_keymgmt_functions[] = {
 742     { OSSL_FUNC_KEYMGMT_NEW, (void (*)(void))dhx_newdata },
 743     { OSSL_FUNC_KEYMGMT_GEN_INIT, (void (*)(void))dhx_gen_init },
 744     { OSSL_FUNC_KEYMGMT_GEN_SET_TEMPLATE, (void (*)(void))dh_gen_set_template },
 745     { OSSL_FUNC_KEYMGMT_GEN_SET_PARAMS, (void (*)(void))dh_gen_set_params },
 746     { OSSL_FUNC_KEYMGMT_GEN_SETTABLE_PARAMS,
 747       (void (*)(void))dh_gen_settable_params },
 748     { OSSL_FUNC_KEYMGMT_GEN, (void (*)(void))dh_gen },
 749     { OSSL_FUNC_KEYMGMT_GEN_CLEANUP, (void (*)(void))dh_gen_cleanup },
 750     { OSSL_FUNC_KEYMGMT_LOAD, (void (*)(void))dh_load },
 751     { OSSL_FUNC_KEYMGMT_FREE, (void (*)(void))dh_freedata },
 752     { OSSL_FUNC_KEYMGMT_GET_PARAMS, (void (*) (void))dh_get_params },
 753     { OSSL_FUNC_KEYMGMT_GETTABLE_PARAMS, (void (*) (void))dh_gettable_params },
 754     { OSSL_FUNC_KEYMGMT_SET_PARAMS, (void (*) (void))dh_set_params },
 755     { OSSL_FUNC_KEYMGMT_SETTABLE_PARAMS, (void (*) (void))dh_settable_params },
 756     { OSSL_FUNC_KEYMGMT_HAS, (void (*)(void))dh_has },
 757     { OSSL_FUNC_KEYMGMT_MATCH, (void (*)(void))dh_match },
 758     { OSSL_FUNC_KEYMGMT_VALIDATE, (void (*)(void))dh_validate },
 759     { OSSL_FUNC_KEYMGMT_IMPORT, (void (*)(void))dh_import },
 760     { OSSL_FUNC_KEYMGMT_IMPORT_TYPES, (void (*)(void))dh_import_types },
 761     { OSSL_FUNC_KEYMGMT_EXPORT, (void (*)(void))dh_export },
 762     { OSSL_FUNC_KEYMGMT_EXPORT_TYPES, (void (*)(void))dh_export_types },
 763     { OSSL_FUNC_KEYMGMT_QUERY_OPERATION_NAME,
 764       (void (*)(void))dhx_query_operation_name },
 765     { 0, NULL }
 766 };