providers/implementations/keymgmt/ec_kmgmt.c

   1 /*
   2  * Copyright 2020-2021 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  * ECDH/ECDSA low level APIs are deprecated for public use, but still ok for
  12  * internal use.
  13  */
  14 #include "internal/deprecated.h"
  15
  16 #include "e_os.h" /* strcasecmp */
  17 #include <string.h>
  18 #include <openssl/core_dispatch.h>
  19 #include <openssl/core_names.h>
  20 #include <openssl/bn.h>
  21 #include <openssl/err.h>
  22 #include <openssl/objects.h>
  23 #include <openssl/proverr.h>
  24 #include "crypto/bn.h"
  25 #include "crypto/ec.h"
  26 #include "prov/implementations.h"
  27 #include "prov/providercommon.h"
  28 #include "prov/provider_ctx.h"
  29 #include "internal/param_build_set.h"
  30
  31 #ifndef FIPS_MODULE
  32 # ifndef OPENSSL_NO_SM2
  33 #  include "crypto/sm2.h"
  34 # endif
  35 #endif
  36
  37 static OSSL_FUNC_keymgmt_new_fn ec_newdata;
  38 static OSSL_FUNC_keymgmt_gen_init_fn ec_gen_init;
  39 static OSSL_FUNC_keymgmt_gen_set_template_fn ec_gen_set_template;
  40 static OSSL_FUNC_keymgmt_gen_set_params_fn ec_gen_set_params;
  41 static OSSL_FUNC_keymgmt_gen_settable_params_fn ec_gen_settable_params;
  42 static OSSL_FUNC_keymgmt_gen_fn ec_gen;
  43 static OSSL_FUNC_keymgmt_gen_cleanup_fn ec_gen_cleanup;
  44 static OSSL_FUNC_keymgmt_load_fn ec_load;
  45 static OSSL_FUNC_keymgmt_free_fn ec_freedata;
  46 static OSSL_FUNC_keymgmt_get_params_fn ec_get_params;
  47 static OSSL_FUNC_keymgmt_gettable_params_fn ec_gettable_params;
  48 static OSSL_FUNC_keymgmt_set_params_fn ec_set_params;
  49 static OSSL_FUNC_keymgmt_settable_params_fn ec_settable_params;
  50 static OSSL_FUNC_keymgmt_has_fn ec_has;
  51 static OSSL_FUNC_keymgmt_match_fn ec_match;
  52 static OSSL_FUNC_keymgmt_validate_fn ec_validate;
  53 static OSSL_FUNC_keymgmt_import_fn ec_import;
  54 static OSSL_FUNC_keymgmt_import_types_fn ec_import_types;
  55 static OSSL_FUNC_keymgmt_export_fn ec_export;
  56 static OSSL_FUNC_keymgmt_export_types_fn ec_export_types;
  57 static OSSL_FUNC_keymgmt_query_operation_name_fn ec_query_operation_name;
  58 #ifndef FIPS_MODULE
  59 # ifndef OPENSSL_NO_SM2
  60 static OSSL_FUNC_keymgmt_gen_fn sm2_gen;
  61 static OSSL_FUNC_keymgmt_get_params_fn sm2_get_params;
  62 static OSSL_FUNC_keymgmt_gettable_params_fn sm2_gettable_params;
  63 static OSSL_FUNC_keymgmt_settable_params_fn sm2_settable_params;
  64 static OSSL_FUNC_keymgmt_import_fn sm2_import;
  65 static OSSL_FUNC_keymgmt_query_operation_name_fn sm2_query_operation_name;
  66 static OSSL_FUNC_keymgmt_validate_fn sm2_validate;
  67 # endif
  68 #endif
  69
  70 #define EC_DEFAULT_MD "SHA256"
  71 #define EC_POSSIBLE_SELECTIONS                                                 \
  72     (OSSL_KEYMGMT_SELECT_KEYPAIR | OSSL_KEYMGMT_SELECT_ALL_PARAMETERS)
  73 #define SM2_DEFAULT_MD "SM3"
  74
  75 static
  76 const char *ec_query_operation_name(int operation_id)
  77 {
  78     switch (operation_id) {
  79     case OSSL_OP_KEYEXCH:
  80         return "ECDH";
  81     case OSSL_OP_SIGNATURE:
  82         return "ECDSA";
  83     }
  84     return NULL;
  85 }
  86
  87 #ifndef FIPS_MODULE
  88 # ifndef OPENSSL_NO_SM2
  89 static
  90 const char *sm2_query_operation_name(int operation_id)
  91 {
  92     switch (operation_id) {
  93     case OSSL_OP_SIGNATURE:
  94         return "SM2";
  95     }
  96     return NULL;
  97 }
  98 # endif
  99 #endif
 100
 101 /*
 102  * Callers of key_to_params MUST make sure that domparams_to_params is also
 103  * called!
 104  *
 105  * This function only exports the bare keypair, domain parameters and other
 106  * parameters are exported separately.
 107  */
 108 static ossl_inline
 109 int key_to_params(const EC_KEY *eckey, OSSL_PARAM_BLD *tmpl,
 110                   OSSL_PARAM params[], int include_private,
 111                   unsigned char **pub_key)
 112 {
 113     BIGNUM *x = NULL, *y = NULL;
 114     const BIGNUM *priv_key = NULL;
 115     const EC_POINT *pub_point = NULL;
 116     const EC_GROUP *ecg = NULL;
 117     size_t pub_key_len = 0;
 118     int ret = 0;
 119     BN_CTX *bnctx = NULL;
 120
 121     if (eckey == NULL
 122         || (ecg = EC_KEY_get0_group(eckey)) == NULL)
 123         return 0;
 124
 125     priv_key = EC_KEY_get0_private_key(eckey);
 126     pub_point = EC_KEY_get0_public_key(eckey);
 127
 128     if (pub_point != NULL) {
 129         OSSL_PARAM *p = NULL, *px = NULL, *py = NULL;
 130         /*
 131          * EC_POINT_point2buf() can generate random numbers in some
 132          * implementations so we need to ensure we use the correct libctx.
 133          */
 134         bnctx = BN_CTX_new_ex(ec_key_get_libctx(eckey));
 135         if (bnctx == NULL)
 136             goto err;
 137
 138
 139         /* If we are doing a get then check first before decoding the point */
 140         if (tmpl == NULL) {
 141             p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_PUB_KEY);
 142             px = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_EC_PUB_X);
 143             py = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_EC_PUB_Y);
 144         }
 145
 146         if (p != NULL || tmpl != NULL) {
 147             /* convert pub_point to a octet string according to the SECG standard */
 148             if ((pub_key_len = EC_POINT_point2buf(ecg, pub_point,
 149                                                   POINT_CONVERSION_COMPRESSED,
 150                                                   pub_key, bnctx)) == 0
 151                 || !ossl_param_build_set_octet_string(tmpl, p,
 152                                                       OSSL_PKEY_PARAM_PUB_KEY,
 153                                                       *pub_key, pub_key_len))
 154                 goto err;
 155         }
 156         if (px != NULL || py != NULL) {
 157             if (px != NULL)
 158                 x = BN_CTX_get(bnctx);
 159             if (py != NULL)
 160                 y = BN_CTX_get(bnctx);
 161
 162             if (!EC_POINT_get_affine_coordinates(ecg, pub_point, x, y, bnctx))
 163                 goto err;
 164             if (px != NULL
 165                 && !ossl_param_build_set_bn(tmpl, px,
 166                                             OSSL_PKEY_PARAM_EC_PUB_X, x))
 167                 goto err;
 168             if (py != NULL
 169                 && !ossl_param_build_set_bn(tmpl, py,
 170                                             OSSL_PKEY_PARAM_EC_PUB_Y, y))
 171                 goto err;
 172         }
 173     }
 174
 175     if (priv_key != NULL && include_private) {
 176         size_t sz;
 177         int ecbits;
 178
 179         /*
 180          * Key import/export should never leak the bit length of the secret
 181          * scalar in the key.
 182          *
 183          * For this reason, on export we use padded BIGNUMs with fixed length.
 184          *
 185          * When importing we also should make sure that, even if short lived,
 186          * the newly created BIGNUM is marked with the BN_FLG_CONSTTIME flag as
 187          * soon as possible, so that any processing of this BIGNUM might opt for
 188          * constant time implementations in the backend.
 189          *
 190          * Setting the BN_FLG_CONSTTIME flag alone is never enough, we also have
 191          * to preallocate the BIGNUM internal buffer to a fixed public size big
 192          * enough that operations performed during the processing never trigger
 193          * a realloc which would leak the size of the scalar through memory
 194          * accesses.
 195          *
 196          * Fixed Length
 197          * ------------
 198          *
 199          * The order of the large prime subgroup of the curve is our choice for
 200          * a fixed public size, as that is generally the upper bound for
 201          * generating a private key in EC cryptosystems and should fit all valid
 202          * secret scalars.
 203          *
 204          * For padding on export we just use the bit length of the order
 205          * converted to bytes (rounding up).
 206          *
 207          * For preallocating the BIGNUM storage we look at the number of "words"
 208          * required for the internal representation of the order, and we
 209          * preallocate 2 extra "words" in case any of the subsequent processing
 210          * might temporarily overflow the order length.
 211          */
 212         ecbits = EC_GROUP_order_bits(ecg);
 213         if (ecbits <= 0)
 214             goto err;
 215         sz = (ecbits + 7 ) / 8;
 216
 217         if (!ossl_param_build_set_bn_pad(tmpl, params,
 218                                          OSSL_PKEY_PARAM_PRIV_KEY,
 219                                          priv_key, sz))
 220             goto err;
 221     }
 222     ret = 1;
 223  err:
 224     BN_CTX_free(bnctx);
 225     return ret;
 226 }
 227
 228 static ossl_inline
 229 int otherparams_to_params(const EC_KEY *ec, OSSL_PARAM_BLD *tmpl,
 230                           OSSL_PARAM params[])
 231 {
 232     int ecdh_cofactor_mode = 0, group_check = 0;
 233     const char *name = NULL;
 234     point_conversion_form_t format;
 235
 236     if (ec == NULL)
 237         return 0;
 238
 239     format = EC_KEY_get_conv_form(ec);
 240     name = ec_pt_format_id2name((int)format);
 241     if (name != NULL
 242         && !ossl_param_build_set_utf8_string(tmpl, params,
 243                                              OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT,
 244                                              name))
 245         return 0;
 246
 247     group_check = EC_KEY_get_flags(ec) & EC_FLAG_CHECK_NAMED_GROUP_MASK;
 248     name = ec_check_group_type_id2name(group_check);
 249     if (name != NULL
 250         && !ossl_param_build_set_utf8_string(tmpl, params,
 251                                              OSSL_PKEY_PARAM_EC_GROUP_CHECK_TYPE,
 252                                              name))
 253         return 0;
 254
 255     if ((EC_KEY_get_enc_flags(ec) & EC_PKEY_NO_PUBKEY) != 0)
 256         ossl_param_build_set_int(tmpl, params,
 257                                  OSSL_PKEY_PARAM_EC_INCLUDE_PUBLIC, 0);
 258
 259     ecdh_cofactor_mode =
 260         (EC_KEY_get_flags(ec) & EC_FLAG_COFACTOR_ECDH) ? 1 : 0;
 261     return ossl_param_build_set_int(tmpl, params,
 262                                     OSSL_PKEY_PARAM_USE_COFACTOR_ECDH,
 263                                     ecdh_cofactor_mode);
 264 }
 265
 266 static
 267 void *ec_newdata(void *provctx)
 268 {
 269     if (!ossl_prov_is_running())
 270         return NULL;
 271     return EC_KEY_new_ex(PROV_LIBCTX_OF(provctx), NULL);
 272 }
 273
 274 static
 275 void ec_freedata(void *keydata)
 276 {
 277     EC_KEY_free(keydata);
 278 }
 279
 280 static
 281 int ec_has(const void *keydata, int selection)
 282 {
 283     const EC_KEY *ec = keydata;
 284     int ok = 0;
 285
 286     if (ossl_prov_is_running() && ec != NULL) {
 287         if ((selection & EC_POSSIBLE_SELECTIONS) != 0)
 288             ok = 1;
 289
 290         if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
 291             ok = ok && (EC_KEY_get0_public_key(ec) != NULL);
 292         if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 293             ok = ok && (EC_KEY_get0_private_key(ec) != NULL);
 294         if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
 295             ok = ok && (EC_KEY_get0_group(ec) != NULL);
 296         /*
 297          * We consider OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS to always be
 298          * available, so no extra check is needed other than the previous one
 299          * against EC_POSSIBLE_SELECTIONS.
 300          */
 301     }
 302     return ok;
 303 }
 304
 305 static int ec_match(const void *keydata1, const void *keydata2, int selection)
 306 {
 307     const EC_KEY *ec1 = keydata1;
 308     const EC_KEY *ec2 = keydata2;
 309     const EC_GROUP *group_a = EC_KEY_get0_group(ec1);
 310     const EC_GROUP *group_b = EC_KEY_get0_group(ec2);
 311     BN_CTX *ctx = NULL;
 312     int ok = 1;
 313
 314     if (!ossl_prov_is_running())
 315         return 0;
 316
 317     ctx = BN_CTX_new_ex(ec_key_get_libctx(ec1));
 318     if (ctx == NULL)
 319         return 0;
 320
 321     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
 322         ok = ok && group_a != NULL && group_b != NULL
 323             && EC_GROUP_cmp(group_a, group_b, ctx) == 0;
 324     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0) {
 325         const BIGNUM *pa = EC_KEY_get0_private_key(ec1);
 326         const BIGNUM *pb = EC_KEY_get0_private_key(ec2);
 327
 328         ok = ok && BN_cmp(pa, pb) == 0;
 329     }
 330     if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0) {
 331         const EC_POINT *pa = EC_KEY_get0_public_key(ec1);
 332         const EC_POINT *pb = EC_KEY_get0_public_key(ec2);
 333
 334         ok = ok && EC_POINT_cmp(group_b, pa, pb, ctx) == 0;
 335     }
 336     BN_CTX_free(ctx);
 337     return ok;
 338 }
 339
 340 static int common_check_sm2(const EC_KEY *ec, int sm2_wanted)
 341 {
 342     const EC_GROUP *ecg = NULL;
 343
 344     /*
 345      * sm2_wanted: import the keys or domparams only on SM2 Curve
 346      * !sm2_wanted: import the keys or domparams only not on SM2 Curve
 347      */
 348     if ((ecg = EC_KEY_get0_group(ec)) == NULL
 349         || (sm2_wanted ^ (EC_GROUP_get_curve_name(ecg) == NID_sm2)))
 350         return 0;
 351     return 1;
 352 }
 353
 354 static
 355 int common_import(void *keydata, int selection, const OSSL_PARAM params[],
 356                   int sm2_wanted)
 357 {
 358     EC_KEY *ec = keydata;
 359     int ok = 1;
 360
 361     if (!ossl_prov_is_running() || ec == NULL)
 362         return 0;
 363
 364     /*
 365      * In this implementation, we can export/import only keydata in the
 366      * following combinations:
 367      *   - domain parameters (+optional other params)
 368      *   - public key with associated domain parameters (+optional other params)
 369      *   - private key with associated domain parameters and optional public key
 370      *         (+optional other params)
 371      *
 372      * This means:
 373      *   - domain parameters must always be requested
 374      *   - private key must be requested alongside public key
 375      *   - other parameters are always optional
 376      */
 377     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) == 0)
 378         return 0;
 379
 380     ok = ok && ec_group_fromdata(ec, params);
 381
 382     if (!common_check_sm2(ec, sm2_wanted))
 383         return 0;
 384
 385     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0) {
 386         int include_private =
 387             selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY ? 1 : 0;
 388
 389         ok = ok && ec_key_fromdata(ec, params, include_private);
 390     }
 391     if ((selection & OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS) != 0)
 392         ok = ok && ec_key_otherparams_fromdata(ec, params);
 393
 394     return ok;
 395 }
 396
 397 static
 398 int ec_import(void *keydata, int selection, const OSSL_PARAM params[])
 399 {
 400     return common_import(keydata, selection, params, 0);
 401 }
 402
 403 #ifndef FIPS_MODULE
 404 # ifndef OPENSSL_NO_SM2
 405 static
 406 int sm2_import(void *keydata, int selection, const OSSL_PARAM params[])
 407 {
 408     return common_import(keydata, selection, params, 1);
 409 }
 410 # endif
 411 #endif
 412
 413 static
 414 int ec_export(void *keydata, int selection, OSSL_CALLBACK *param_cb,
 415               void *cbarg)
 416 {
 417     EC_KEY *ec = keydata;
 418     OSSL_PARAM_BLD *tmpl = NULL;
 419     OSSL_PARAM *params = NULL;
 420     unsigned char *pub_key = NULL, *genbuf = NULL;
 421     BN_CTX *bnctx = NULL;
 422     int ok = 1;
 423
 424     if (!ossl_prov_is_running() || ec == NULL)
 425         return 0;
 426
 427     /*
 428      * In this implementation, we can export/import only keydata in the
 429      * following combinations:
 430      *   - domain parameters (+optional other params)
 431      *   - public key with associated domain parameters (+optional other params)
 432      *   - private key with associated public key and domain parameters
 433      *         (+optional other params)
 434      *
 435      * This means:
 436      *   - domain parameters must always be requested
 437      *   - private key must be requested alongside public key
 438      *   - other parameters are always optional
 439      */
 440     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) == 0)
 441         return 0;
 442     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0
 443             && (selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) == 0)
 444         return 0;
 445     if ((selection & OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS) != 0
 446             && (selection & OSSL_KEYMGMT_SELECT_KEYPAIR) == 0)
 447         return 0;
 448
 449     tmpl = OSSL_PARAM_BLD_new();
 450     if (tmpl == NULL)
 451         return 0;
 452
 453     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0) {
 454         bnctx = BN_CTX_new_ex(ec_key_get_libctx(ec));
 455         if (bnctx == NULL) {
 456             ok = 0;
 457             goto end;
 458         }
 459         BN_CTX_start(bnctx);
 460         ok = ok && ec_group_todata(EC_KEY_get0_group(ec), tmpl, NULL,
 461                                    ec_key_get_libctx(ec), ec_key_get0_propq(ec),
 462                                    bnctx, &genbuf);
 463     }
 464
 465     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0) {
 466         int include_private =
 467             selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY ? 1 : 0;
 468
 469         ok = ok && key_to_params(ec, tmpl, NULL, include_private, &pub_key);
 470     }
 471     if ((selection & OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS) != 0)
 472         ok = ok && otherparams_to_params(ec, tmpl, NULL);
 473
 474     if (ok && (params = OSSL_PARAM_BLD_to_param(tmpl)) != NULL)
 475         ok = param_cb(params, cbarg);
 476 end:
 477     OSSL_PARAM_BLD_free_params(params);
 478     OSSL_PARAM_BLD_free(tmpl);
 479     OPENSSL_free(pub_key);
 480     OPENSSL_free(genbuf);
 481     BN_CTX_end(bnctx);
 482     BN_CTX_free(bnctx);
 483     return ok;
 484 }
 485
 486 /* IMEXPORT = IMPORT + EXPORT */
 487
 488 # define EC_IMEXPORTABLE_DOM_PARAMETERS                                        \
 489     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_GROUP_NAME, NULL, 0),               \
 490     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_EC_ENCODING, NULL, 0),              \
 491     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT, NULL, 0),\
 492     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_EC_FIELD_TYPE, NULL, 0),            \
 493     OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_P, NULL, 0),                              \
 494     OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_A, NULL, 0),                              \
 495     OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_B, NULL, 0),                              \
 496     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_EC_GENERATOR, NULL, 0),            \
 497     OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_ORDER, NULL, 0),                          \
 498     OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_COFACTOR, NULL, 0),                       \
 499     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_EC_SEED, NULL, 0)
 500
 501 # define EC_IMEXPORTABLE_PUBLIC_KEY                                            \
 502     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_PUB_KEY, NULL, 0)
 503 # define EC_IMEXPORTABLE_PRIVATE_KEY                                           \
 504     OSSL_PARAM_BN(OSSL_PKEY_PARAM_PRIV_KEY, NULL, 0)
 505 # define EC_IMEXPORTABLE_OTHER_PARAMETERS                                      \
 506     OSSL_PARAM_int(OSSL_PKEY_PARAM_USE_COFACTOR_ECDH, NULL),                   \
 507     OSSL_PARAM_int(OSSL_PKEY_PARAM_EC_INCLUDE_PUBLIC, NULL)
 508
 509 /*
 510  * Include all the possible combinations of OSSL_PARAM arrays for
 511  * ec_imexport_types().
 512  *
 513  * They are in a separate file as it is ~100 lines of unreadable and
 514  * uninteresting machine generated stuff.
 515  */
 516 #include "ec_kmgmt_imexport.inc"
 517
 518 static ossl_inline
 519 const OSSL_PARAM *ec_imexport_types(int selection)
 520 {
 521     int type_select = 0;
 522
 523     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 524         type_select += 1;
 525     if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
 526         type_select += 2;
 527     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
 528         type_select += 4;
 529     if ((selection & OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS) != 0)
 530         type_select += 8;
 531     return ec_types[type_select];
 532 }
 533
 534 static
 535 const OSSL_PARAM *ec_import_types(int selection)
 536 {
 537     return ec_imexport_types(selection);
 538 }
 539
 540 static
 541 const OSSL_PARAM *ec_export_types(int selection)
 542 {
 543     return ec_imexport_types(selection);
 544 }
 545
 546 static int ec_get_ecm_params(const EC_GROUP *group, OSSL_PARAM params[])
 547 {
 548 #ifdef OPENSSL_NO_EC2M
 549     return 1;
 550 #else
 551     int ret = 0, m;
 552     unsigned int k1 = 0, k2 = 0, k3 = 0;
 553     int basis_nid;
 554     const char *basis_name = NULL;
 555     int fid = EC_GROUP_get_field_type(group);
 556
 557     if (fid != NID_X9_62_characteristic_two_field)
 558         return 1;
 559
 560     basis_nid = EC_GROUP_get_basis_type(group);
 561     if (basis_nid == NID_X9_62_tpBasis)
 562         basis_name = SN_X9_62_tpBasis;
 563     else if (basis_nid == NID_X9_62_ppBasis)
 564         basis_name = SN_X9_62_ppBasis;
 565     else
 566         goto err;
 567
 568     m = EC_GROUP_get_degree(group);
 569     if (!ossl_param_build_set_int(NULL, params, OSSL_PKEY_PARAM_EC_CHAR2_M, m)
 570         || !ossl_param_build_set_utf8_string(NULL, params,
 571                                              OSSL_PKEY_PARAM_EC_CHAR2_TYPE,
 572                                              basis_name))
 573         goto err;
 574
 575     if (basis_nid == NID_X9_62_tpBasis) {
 576         if (!EC_GROUP_get_trinomial_basis(group, &k1)
 577             || !ossl_param_build_set_int(NULL, params,
 578                                          OSSL_PKEY_PARAM_EC_CHAR2_TP_BASIS,
 579                                          (int)k1))
 580             goto err;
 581     } else {
 582         if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3)
 583             || !ossl_param_build_set_int(NULL, params,
 584                                          OSSL_PKEY_PARAM_EC_CHAR2_PP_K1, (int)k1)
 585             || !ossl_param_build_set_int(NULL, params,
 586                                          OSSL_PKEY_PARAM_EC_CHAR2_PP_K2, (int)k2)
 587             || !ossl_param_build_set_int(NULL, params,
 588                                          OSSL_PKEY_PARAM_EC_CHAR2_PP_K3, (int)k3))
 589             goto err;
 590     }
 591     ret = 1;
 592 err:
 593     return ret;
 594 #endif /* OPENSSL_NO_EC2M */
 595 }
 596
 597 static
 598 int common_get_params(void *key, OSSL_PARAM params[], int sm2)
 599 {
 600     int ret = 0;
 601     EC_KEY *eck = key;
 602     const EC_GROUP *ecg = NULL;
 603     OSSL_PARAM *p;
 604     unsigned char *pub_key = NULL, *genbuf = NULL;
 605     OSSL_LIB_CTX *libctx;
 606     const char *propq;
 607     BN_CTX *bnctx = NULL;
 608
 609     ecg = EC_KEY_get0_group(eck);
 610     if (ecg == NULL)
 611         return 0;
 612
 613     libctx = ec_key_get_libctx(eck);
 614     propq = ec_key_get0_propq(eck);
 615
 616     bnctx = BN_CTX_new_ex(libctx);
 617     if (bnctx == NULL)
 618         return 0;
 619     BN_CTX_start(bnctx);
 620
 621     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_MAX_SIZE)) != NULL
 622         && !OSSL_PARAM_set_int(p, ECDSA_size(eck)))
 623         goto err;
 624     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_BITS)) != NULL
 625         && !OSSL_PARAM_set_int(p, EC_GROUP_order_bits(ecg)))
 626         goto err;
 627     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_SECURITY_BITS)) != NULL) {
 628         int ecbits, sec_bits;
 629
 630         ecbits = EC_GROUP_order_bits(ecg);
 631
 632         /*
 633          * The following estimates are based on the values published
 634          * in Table 2 of "NIST Special Publication 800-57 Part 1 Revision 4"
 635          * at http://dx.doi.org/10.6028/NIST.SP.800-57pt1r4 .
 636          *
 637          * Note that the above reference explicitly categorizes algorithms in a
 638          * discrete set of values {80, 112, 128, 192, 256}, and that it is
 639          * relevant only for NIST approved Elliptic Curves, while OpenSSL
 640          * applies the same logic also to other curves.
 641          *
 642          * Classifications produced by other standardazing bodies might differ,
 643          * so the results provided for "bits of security" by this provider are
 644          * to be considered merely indicative, and it is the users'
 645          * responsibility to compare these values against the normative
 646          * references that may be relevant for their intent and purposes.
 647          */
 648         if (ecbits >= 512)
 649             sec_bits = 256;
 650         else if (ecbits >= 384)
 651             sec_bits = 192;
 652         else if (ecbits >= 256)
 653             sec_bits = 128;
 654         else if (ecbits >= 224)
 655             sec_bits = 112;
 656         else if (ecbits >= 160)
 657             sec_bits = 80;
 658         else
 659             sec_bits = ecbits / 2;
 660
 661         if (!OSSL_PARAM_set_int(p, sec_bits))
 662             goto err;
 663     }
 664
 665     if (!sm2) {
 666         if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_DEFAULT_DIGEST)) != NULL
 667                 && !OSSL_PARAM_set_utf8_string(p, EC_DEFAULT_MD))
 668             goto err;
 669     } else {
 670         if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_DEFAULT_DIGEST)) != NULL
 671                 && !OSSL_PARAM_set_utf8_string(p, SM2_DEFAULT_MD))
 672             goto err;
 673     }
 674
 675     /* SM2 doesn't support this PARAM */
 676     if (!sm2) {
 677         p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_USE_COFACTOR_ECDH);
 678         if (p != NULL) {
 679             int ecdh_cofactor_mode = 0;
 680
 681             ecdh_cofactor_mode =
 682                 (EC_KEY_get_flags(eck) & EC_FLAG_COFACTOR_ECDH) ? 1 : 0;
 683
 684             if (!OSSL_PARAM_set_int(p, ecdh_cofactor_mode))
 685                 goto err;
 686         }
 687     }
 688     if ((p = OSSL_PARAM_locate(params,
 689                                OSSL_PKEY_PARAM_ENCODED_PUBLIC_KEY)) != NULL) {
 690         p->return_size = EC_POINT_point2oct(EC_KEY_get0_group(key),
 691                                             EC_KEY_get0_public_key(key),
 692                                             POINT_CONVERSION_UNCOMPRESSED,
 693                                             p->data, p->return_size, bnctx);
 694         if (p->return_size == 0)
 695             goto err;
 696     }
 697
 698     ret = ec_get_ecm_params(ecg, params)
 699           && ec_group_todata(ecg, NULL, params, libctx, propq, bnctx, &genbuf)
 700           && key_to_params(eck, NULL, params, 1, &pub_key)
 701           && otherparams_to_params(eck, NULL, params);
 702 err:
 703     OPENSSL_free(genbuf);
 704     OPENSSL_free(pub_key);
 705     BN_CTX_end(bnctx);
 706     BN_CTX_free(bnctx);
 707     return ret;
 708 }
 709
 710 static
 711 int ec_get_params(void *key, OSSL_PARAM params[])
 712 {
 713     return common_get_params(key, params, 0);
 714 }
 715
 716 #ifndef OPENSSL_NO_EC2M
 717 # define EC2M_GETTABLE_DOM_PARAMS                                              \
 718         OSSL_PARAM_int(OSSL_PKEY_PARAM_EC_CHAR2_M, NULL),                      \
 719         OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_EC_CHAR2_TYPE, NULL, 0),        \
 720         OSSL_PARAM_int(OSSL_PKEY_PARAM_EC_CHAR2_TP_BASIS, NULL),               \
 721         OSSL_PARAM_int(OSSL_PKEY_PARAM_EC_CHAR2_PP_K1, NULL),                  \
 722         OSSL_PARAM_int(OSSL_PKEY_PARAM_EC_CHAR2_PP_K2, NULL),                  \
 723         OSSL_PARAM_int(OSSL_PKEY_PARAM_EC_CHAR2_PP_K3, NULL),
 724 #else
 725 # define EC2M_GETTABLE_DOM_PARAMS
 726 #endif
 727
 728 static const OSSL_PARAM ec_known_gettable_params[] = {
 729     OSSL_PARAM_int(OSSL_PKEY_PARAM_BITS, NULL),
 730     OSSL_PARAM_int(OSSL_PKEY_PARAM_SECURITY_BITS, NULL),
 731     OSSL_PARAM_int(OSSL_PKEY_PARAM_MAX_SIZE, NULL),
 732     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_DEFAULT_DIGEST, NULL, 0),
 733     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_ENCODED_PUBLIC_KEY, NULL, 0),
 734     EC_IMEXPORTABLE_DOM_PARAMETERS,
 735     EC2M_GETTABLE_DOM_PARAMS
 736     EC_IMEXPORTABLE_PUBLIC_KEY,
 737     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_EC_PUB_X, NULL, 0),
 738     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_EC_PUB_Y, NULL, 0),
 739     EC_IMEXPORTABLE_PRIVATE_KEY,
 740     EC_IMEXPORTABLE_OTHER_PARAMETERS,
 741     OSSL_PARAM_END
 742 };
 743
 744 static
 745 const OSSL_PARAM *ec_gettable_params(void *provctx)
 746 {
 747     return ec_known_gettable_params;
 748 }
 749
 750 static const OSSL_PARAM ec_known_settable_params[] = {
 751     OSSL_PARAM_int(OSSL_PKEY_PARAM_USE_COFACTOR_ECDH, NULL),
 752     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_ENCODED_PUBLIC_KEY, NULL, 0),
 753     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_EC_ENCODING, NULL, 0),
 754     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT, NULL, 0),
 755     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_EC_SEED, NULL, 0),
 756     OSSL_PARAM_int(OSSL_PKEY_PARAM_EC_INCLUDE_PUBLIC, NULL),
 757     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_EC_GROUP_CHECK_TYPE, NULL, 0),
 758     OSSL_PARAM_END
 759 };
 760
 761 static
 762 const OSSL_PARAM *ec_settable_params(void *provctx)
 763 {
 764     return ec_known_settable_params;
 765 }
 766
 767 static
 768 int ec_set_params(void *key, const OSSL_PARAM params[])
 769 {
 770     EC_KEY *eck = key;
 771     const OSSL_PARAM *p;
 772
 773     if (key == NULL)
 774         return 0;
 775
 776     if (!ec_group_set_params((EC_GROUP *)EC_KEY_get0_group(key), params))
 777         return 0;
 778
 779     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_ENCODED_PUBLIC_KEY);
 780     if (p != NULL) {
 781         BN_CTX *ctx = BN_CTX_new_ex(ec_key_get_libctx(key));
 782         int ret = 1;
 783
 784         if (ctx == NULL
 785                 || p->data_type != OSSL_PARAM_OCTET_STRING
 786                 || !EC_KEY_oct2key(key, p->data, p->data_size, ctx))
 787             ret = 0;
 788         BN_CTX_free(ctx);
 789         if (!ret)
 790             return 0;
 791     }
 792
 793     return ec_key_otherparams_fromdata(eck, params);
 794 }
 795
 796 #ifndef FIPS_MODULE
 797 # ifndef OPENSSL_NO_SM2
 798 static
 799 int sm2_get_params(void *key, OSSL_PARAM params[])
 800 {
 801     return common_get_params(key, params, 1);
 802 }
 803
 804 static const OSSL_PARAM sm2_known_gettable_params[] = {
 805     OSSL_PARAM_int(OSSL_PKEY_PARAM_BITS, NULL),
 806     OSSL_PARAM_int(OSSL_PKEY_PARAM_SECURITY_BITS, NULL),
 807     OSSL_PARAM_int(OSSL_PKEY_PARAM_MAX_SIZE, NULL),
 808     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_DEFAULT_DIGEST, NULL, 0),
 809     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_ENCODED_PUBLIC_KEY, NULL, 0),
 810     EC_IMEXPORTABLE_DOM_PARAMETERS,
 811     EC_IMEXPORTABLE_PUBLIC_KEY,
 812     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_EC_PUB_X, NULL, 0),
 813     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_EC_PUB_Y, NULL, 0),
 814     EC_IMEXPORTABLE_PRIVATE_KEY,
 815     OSSL_PARAM_END
 816 };
 817
 818 static
 819 const OSSL_PARAM *sm2_gettable_params(ossl_unused void *provctx)
 820 {
 821     return sm2_known_gettable_params;
 822 }
 823
 824 static const OSSL_PARAM sm2_known_settable_params[] = {
 825     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_ENCODED_PUBLIC_KEY, NULL, 0),
 826     OSSL_PARAM_END
 827 };
 828
 829 static
 830 const OSSL_PARAM *sm2_settable_params(ossl_unused void *provctx)
 831 {
 832     return sm2_known_settable_params;
 833 }
 834
 835 static
 836 int sm2_validate(const void *keydata, int selection, int checktype)
 837 {
 838     const EC_KEY *eck = keydata;
 839     int ok = 0;
 840     BN_CTX *ctx = NULL;
 841
 842     if (!ossl_prov_is_running())
 843         return 0;
 844
 845     ctx = BN_CTX_new_ex(ec_key_get_libctx(eck));
 846     if  (ctx == NULL)
 847         return 0;
 848
 849     if ((selection & EC_POSSIBLE_SELECTIONS) != 0)
 850         ok = 1;
 851
 852     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
 853         ok = ok && EC_GROUP_check(EC_KEY_get0_group(eck), ctx);
 854
 855     if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0) {
 856         if (checktype == OSSL_KEYMGMT_VALIDATE_QUICK_CHECK)
 857             ok = ok && ec_key_public_check_quick(eck, ctx);
 858         else
 859             ok = ok && ec_key_public_check(eck, ctx);
 860     }
 861
 862     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 863         ok = ok && sm2_key_private_check(eck);
 864
 865     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) == OSSL_KEYMGMT_SELECT_KEYPAIR)
 866         ok = ok && ec_key_pairwise_check(eck, ctx);
 867
 868     BN_CTX_free(ctx);
 869     return ok;
 870 }
 871 # endif
 872 #endif
 873
 874 static
 875 int ec_validate(const void *keydata, int selection, int checktype)
 876 {
 877     const EC_KEY *eck = keydata;
 878     int ok = 0;
 879     BN_CTX *ctx = NULL;
 880
 881     if (!ossl_prov_is_running())
 882         return 0;
 883
 884     ctx = BN_CTX_new_ex(ec_key_get_libctx(eck));
 885     if  (ctx == NULL)
 886         return 0;
 887
 888     if ((selection & EC_POSSIBLE_SELECTIONS) != 0)
 889         ok = 1;
 890
 891     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0) {
 892         int flags = EC_KEY_get_flags(eck);
 893
 894         if ((flags & EC_FLAG_CHECK_NAMED_GROUP) != 0)
 895             ok = ok && EC_GROUP_check_named_curve(EC_KEY_get0_group(eck),
 896                            (flags & EC_FLAG_CHECK_NAMED_GROUP_NIST) != 0, ctx);
 897         else
 898             ok = ok && EC_GROUP_check(EC_KEY_get0_group(eck), ctx);
 899     }
 900
 901     if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0) {
 902         if (checktype == OSSL_KEYMGMT_VALIDATE_QUICK_CHECK)
 903             ok = ok && ec_key_public_check_quick(eck, ctx);
 904         else
 905             ok = ok && ec_key_public_check(eck, ctx);
 906     }
 907
 908     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 909         ok = ok && ec_key_private_check(eck);
 910
 911     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) == OSSL_KEYMGMT_SELECT_KEYPAIR)
 912         ok = ok && ec_key_pairwise_check(eck, ctx);
 913
 914     BN_CTX_free(ctx);
 915     return ok;
 916 }
 917
 918 struct ec_gen_ctx {
 919     OSSL_LIB_CTX *libctx;
 920     char *group_name;
 921     char *encoding;
 922     char *pt_format;
 923     char *group_check;
 924     char *field_type;
 925     BIGNUM *p, *a, *b, *order, *cofactor;
 926     unsigned char *gen, *seed;
 927     size_t gen_len, seed_len;
 928     int selection;
 929     int ecdh_mode;
 930     EC_GROUP *gen_group;
 931 };
 932
 933 static void *ec_gen_init(void *provctx, int selection)
 934 {
 935     OSSL_LIB_CTX *libctx = PROV_LIBCTX_OF(provctx);
 936     struct ec_gen_ctx *gctx = NULL;
 937
 938     if (!ossl_prov_is_running() || (selection & (EC_POSSIBLE_SELECTIONS)) == 0)
 939         return NULL;
 940
 941     if ((gctx = OPENSSL_zalloc(sizeof(*gctx))) != NULL) {
 942         gctx->libctx = libctx;
 943         gctx->selection = selection;
 944         gctx->ecdh_mode = 0;
 945     }
 946     return gctx;
 947 }
 948
 949 static int ec_gen_set_group(void *genctx, const EC_GROUP *src)
 950 {
 951     struct ec_gen_ctx *gctx = genctx;
 952     EC_GROUP *group;
 953
 954     group = EC_GROUP_dup(src);
 955     if (group == NULL) {
 956         ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_CURVE);
 957         return 0;
 958     }
 959     EC_GROUP_free(gctx->gen_group);
 960     gctx->gen_group = group;
 961     return 1;
 962 }
 963
 964 static int ec_gen_set_template(void *genctx, void *templ)
 965 {
 966     struct ec_gen_ctx *gctx = genctx;
 967     EC_KEY *ec = templ;
 968     const EC_GROUP *ec_group;
 969
 970     if (!ossl_prov_is_running() || gctx == NULL || ec == NULL)
 971         return 0;
 972     if ((ec_group = EC_KEY_get0_group(ec)) == NULL)
 973         return 0;
 974     return ec_gen_set_group(gctx, ec_group);
 975 }
 976
 977 #define COPY_INT_PARAM(params, key, val)                                       \
 978 p = OSSL_PARAM_locate_const(params, key);                                      \
 979 if (p != NULL && !OSSL_PARAM_get_int(p, &val))                                 \
 980     goto err;
 981
 982 #define COPY_UTF8_PARAM(params, key, val)                                      \
 983 p = OSSL_PARAM_locate_const(params, key);                                      \
 984 if (p != NULL) {                                                               \
 985     if (p->data_type != OSSL_PARAM_UTF8_STRING)                                \
 986         goto err;                                                              \
 987     OPENSSL_free(val);                                                         \
 988     val = OPENSSL_strdup(p->data);                                             \
 989     if (val == NULL)                                                           \
 990         goto err;                                                              \
 991 }
 992
 993 #define COPY_OCTET_PARAM(params, key, val, len)                                \
 994 p = OSSL_PARAM_locate_const(params, key);                                      \
 995 if (p != NULL) {                                                               \
 996     if (p->data_type != OSSL_PARAM_OCTET_STRING)                               \
 997         goto err;                                                              \
 998     OPENSSL_free(val);                                                         \
 999     len = p->data_size;                                                        \
1000     val = OPENSSL_memdup(p->data, p->data_size);                               \
1001     if (val == NULL)                                                           \
1002         goto err;                                                              \
1003 }
1004
1005 #define COPY_BN_PARAM(params, key, bn)                                         \
1006 p = OSSL_PARAM_locate_const(params, key);                                      \
1007 if (p != NULL) {                                                               \
1008     if (bn == NULL)                                                            \
1009         bn = BN_new();                                                         \
1010     if (bn == NULL || !OSSL_PARAM_get_BN(p, &bn))                              \
1011         goto err;                                                              \
1012 }
1013
1014 static int ec_gen_set_params(void *genctx, const OSSL_PARAM params[])
1015 {
1016     int ret = 0;
1017     struct ec_gen_ctx *gctx = genctx;
1018     const OSSL_PARAM *p;
1019     EC_GROUP *group = NULL;
1020
1021     COPY_INT_PARAM(params, OSSL_PKEY_PARAM_USE_COFACTOR_ECDH, gctx->ecdh_mode);
1022
1023     COPY_UTF8_PARAM(params, OSSL_PKEY_PARAM_GROUP_NAME, gctx->group_name);
1024     COPY_UTF8_PARAM(params, OSSL_PKEY_PARAM_EC_FIELD_TYPE, gctx->field_type);
1025     COPY_UTF8_PARAM(params, OSSL_PKEY_PARAM_EC_ENCODING, gctx->encoding);
1026     COPY_UTF8_PARAM(params, OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT, gctx->pt_format);
1027     COPY_UTF8_PARAM(params, OSSL_PKEY_PARAM_EC_GROUP_CHECK_TYPE, gctx->group_check);
1028
1029     COPY_BN_PARAM(params, OSSL_PKEY_PARAM_EC_P, gctx->p);
1030     COPY_BN_PARAM(params, OSSL_PKEY_PARAM_EC_A, gctx->a);
1031     COPY_BN_PARAM(params, OSSL_PKEY_PARAM_EC_B, gctx->b);
1032     COPY_BN_PARAM(params, OSSL_PKEY_PARAM_EC_ORDER, gctx->order);
1033     COPY_BN_PARAM(params, OSSL_PKEY_PARAM_EC_COFACTOR, gctx->cofactor);
1034
1035     COPY_OCTET_PARAM(params, OSSL_PKEY_PARAM_EC_SEED, gctx->seed, gctx->seed_len);
1036     COPY_OCTET_PARAM(params, OSSL_PKEY_PARAM_EC_GENERATOR, gctx->gen,
1037                      gctx->gen_len);
1038
1039     ret = 1;
1040 err:
1041     EC_GROUP_free(group);
1042     return ret;
1043 }
1044
1045 static int ec_gen_set_group_from_params(struct ec_gen_ctx *gctx)
1046 {
1047     int ret = 0;
1048     OSSL_PARAM_BLD *bld;
1049     OSSL_PARAM *params = NULL;
1050     EC_GROUP *group = NULL;
1051
1052     bld = OSSL_PARAM_BLD_new();
1053     if (bld == NULL)
1054         return 0;
1055
1056     if (gctx->encoding != NULL
1057         && !OSSL_PARAM_BLD_push_utf8_string(bld, OSSL_PKEY_PARAM_EC_ENCODING,
1058                                             gctx->encoding, 0))
1059         goto err;
1060
1061     if (gctx->pt_format != NULL
1062         && !OSSL_PARAM_BLD_push_utf8_string(bld,
1063                                             OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT,
1064                                             gctx->pt_format, 0))
1065         goto err;
1066
1067     if (gctx->group_name != NULL) {
1068         if (!OSSL_PARAM_BLD_push_utf8_string(bld, OSSL_PKEY_PARAM_GROUP_NAME,
1069                                              gctx->group_name, 0))
1070             goto err;
1071         /* Ignore any other parameters if there is a group name */
1072         goto build;
1073     } else if (gctx->field_type != NULL) {
1074         if (!OSSL_PARAM_BLD_push_utf8_string(bld, OSSL_PKEY_PARAM_EC_FIELD_TYPE,
1075                                              gctx->field_type, 0))
1076             goto err;
1077     } else {
1078         goto err;
1079     }
1080     if (gctx->p == NULL
1081         || gctx->a == NULL
1082         || gctx->b == NULL
1083         || gctx->order == NULL
1084         || !OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_EC_P, gctx->p)
1085         || !OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_EC_A, gctx->a)
1086         || !OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_EC_B, gctx->b)
1087         || !OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_EC_ORDER, gctx->order))
1088         goto err;
1089
1090     if (gctx->cofactor != NULL
1091         && !OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_EC_COFACTOR,
1092                                    gctx->cofactor))
1093         goto err;
1094
1095     if (gctx->seed != NULL
1096         && !OSSL_PARAM_BLD_push_octet_string(bld, OSSL_PKEY_PARAM_EC_SEED,
1097                                              gctx->seed, gctx->seed_len))
1098         goto err;
1099
1100     if (gctx->gen == NULL
1101         || !OSSL_PARAM_BLD_push_octet_string(bld, OSSL_PKEY_PARAM_EC_GENERATOR,
1102                                              gctx->gen, gctx->gen_len))
1103         goto err;
1104 build:
1105     params = OSSL_PARAM_BLD_to_param(bld);
1106     if (params == NULL)
1107         goto err;
1108     group = EC_GROUP_new_from_params(params, gctx->libctx, NULL);
1109     if (group == NULL)
1110         goto err;
1111
1112     EC_GROUP_free(gctx->gen_group);
1113     gctx->gen_group = group;
1114
1115     ret = 1;
1116 err:
1117     OSSL_PARAM_BLD_free_params(params);
1118     OSSL_PARAM_BLD_free(bld);
1119     return ret;
1120 }
1121
1122 static const OSSL_PARAM *ec_gen_settable_params(void *provctx)
1123 {
1124     static OSSL_PARAM settable[] = {
1125         OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_GROUP_NAME, NULL, 0),
1126         OSSL_PARAM_int(OSSL_PKEY_PARAM_USE_COFACTOR_ECDH, NULL),
1127         OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_EC_ENCODING, NULL, 0),
1128         OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT, NULL, 0),
1129         OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_EC_FIELD_TYPE, NULL, 0),
1130         OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_P, NULL, 0),
1131         OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_A, NULL, 0),
1132         OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_B, NULL, 0),
1133         OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_EC_GENERATOR, NULL, 0),
1134         OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_ORDER, NULL, 0),
1135         OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_COFACTOR, NULL, 0),
1136         OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_EC_SEED, NULL, 0),
1137         OSSL_PARAM_END
1138     };
1139
1140     return settable;
1141 }
1142
1143 static int ec_gen_assign_group(EC_KEY *ec, EC_GROUP *group)
1144 {
1145     if (group == NULL) {
1146         ERR_raise(ERR_LIB_PROV, PROV_R_NO_PARAMETERS_SET);
1147         return 0;
1148     }
1149     return EC_KEY_set_group(ec, group) > 0;
1150 }
1151
1152 /*
1153  * The callback arguments (osslcb & cbarg) are not used by EC_KEY generation
1154  */
1155 static void *ec_gen(void *genctx, OSSL_CALLBACK *osslcb, void *cbarg)
1156 {
1157     struct ec_gen_ctx *gctx = genctx;
1158     EC_KEY *ec = NULL;
1159     int ret = 0;
1160
1161     if (!ossl_prov_is_running()
1162         || gctx == NULL
1163         || (ec = EC_KEY_new_ex(gctx->libctx, NULL)) == NULL)
1164         return NULL;
1165
1166     if (gctx->gen_group == NULL) {
1167         if (!ec_gen_set_group_from_params(gctx))
1168             goto err;
1169     } else {
1170         if (gctx->encoding != NULL) {
1171             int flags = ec_encoding_name2id(gctx->encoding);
1172
1173             if (flags < 0)
1174                 goto err;
1175             EC_GROUP_set_asn1_flag(gctx->gen_group, flags);
1176         }
1177         if (gctx->pt_format != NULL) {
1178             int format = ec_pt_format_name2id(gctx->pt_format);
1179
1180             if (format < 0)
1181                 goto err;
1182             EC_GROUP_set_point_conversion_form(gctx->gen_group, format);
1183         }
1184     }
1185
1186     /* We must always assign a group, no matter what */
1187     ret = ec_gen_assign_group(ec, gctx->gen_group);
1188
1189     /* Whether you want it or not, you get a keypair, not just one half */
1190     if ((gctx->selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
1191         ret = ret && EC_KEY_generate_key(ec);
1192
1193     if (gctx->ecdh_mode != -1)
1194         ret = ret && ec_set_ecdh_cofactor_mode(ec, gctx->ecdh_mode);
1195
1196     if (gctx->group_check != NULL)
1197         ret = ret && ec_set_check_group_type_from_name(ec, gctx->group_check);
1198     if (ret)
1199         return ec;
1200 err:
1201     /* Something went wrong, throw the key away */
1202     EC_KEY_free(ec);
1203     return NULL;
1204 }
1205
1206 #ifndef FIPS_MODULE
1207 # ifndef OPENSSL_NO_SM2
1208 /*
1209  * The callback arguments (osslcb & cbarg) are not used by EC_KEY generation
1210  */
1211 static void *sm2_gen(void *genctx, OSSL_CALLBACK *osslcb, void *cbarg)
1212 {
1213     struct ec_gen_ctx *gctx = genctx;
1214     EC_KEY *ec = NULL;
1215     int ret = 1;
1216
1217     if (gctx == NULL
1218         || (ec = EC_KEY_new_ex(gctx->libctx, NULL)) == NULL)
1219         return NULL;
1220
1221     if (gctx->gen_group == NULL) {
1222         if (!ec_gen_set_group_from_params(gctx))
1223             goto err;
1224     } else {
1225         if (gctx->encoding) {
1226             int flags = ec_encoding_name2id(gctx->encoding);
1227
1228             if (flags < 0)
1229                 goto err;
1230             EC_GROUP_set_asn1_flag(gctx->gen_group, flags);
1231         }
1232         if (gctx->pt_format != NULL) {
1233             int format = ec_pt_format_name2id(gctx->pt_format);
1234
1235             if (format < 0)
1236                 goto err;
1237             EC_GROUP_set_point_conversion_form(gctx->gen_group, format);
1238         }
1239     }
1240
1241     /* We must always assign a group, no matter what */
1242     ret = ec_gen_assign_group(ec, gctx->gen_group);
1243
1244     /* Whether you want it or not, you get a keypair, not just one half */
1245     if ((gctx->selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0) {
1246         /*
1247          * For SM2, we need a new flag to indicate the 'generate' function
1248          * to use a new range
1249          */
1250         EC_KEY_set_flags(ec, EC_FLAG_SM2_RANGE);
1251         ret = ret && EC_KEY_generate_key(ec);
1252     }
1253
1254     if (ret)
1255         return ec;
1256 err:
1257     /* Something went wrong, throw the key away */
1258     EC_KEY_free(ec);
1259     return NULL;
1260 }
1261 # endif
1262 #endif
1263
1264 static void ec_gen_cleanup(void *genctx)
1265 {
1266     struct ec_gen_ctx *gctx = genctx;
1267
1268     if (gctx == NULL)
1269         return;
1270
1271     EC_GROUP_free(gctx->gen_group);
1272     BN_free(gctx->p);
1273     BN_free(gctx->a);
1274     BN_free(gctx->b);
1275     BN_free(gctx->order);
1276     BN_free(gctx->cofactor);
1277     OPENSSL_free(gctx->group_name);
1278     OPENSSL_free(gctx->field_type);
1279     OPENSSL_free(gctx->pt_format);
1280     OPENSSL_free(gctx->encoding);
1281     OPENSSL_free(gctx->seed);
1282     OPENSSL_free(gctx->gen);
1283     OPENSSL_free(gctx);
1284 }
1285
1286 static void *common_load(const void *reference, size_t reference_sz,
1287                          int sm2_wanted)
1288 {
1289     EC_KEY *ec = NULL;
1290
1291     if (ossl_prov_is_running() && reference_sz == sizeof(ec)) {
1292         /* The contents of the reference is the address to our object */
1293         ec = *(EC_KEY **)reference;
1294
1295         if (!common_check_sm2(ec, sm2_wanted))
1296             return NULL;
1297
1298         /* We grabbed, so we detach it */
1299         *(EC_KEY **)reference = NULL;
1300         return ec;
1301     }
1302     return NULL;
1303 }
1304
1305 static void *ec_load(const void *reference, size_t reference_sz)
1306 {
1307     return common_load(reference, reference_sz, 0);
1308 }
1309
1310 #ifndef FIPS_MODULE
1311 # ifndef OPENSSL_NO_SM2
1312 static void *sm2_load(const void *reference, size_t reference_sz)
1313 {
1314     return common_load(reference, reference_sz, 1);
1315 }
1316 # endif
1317 #endif
1318
1319 const OSSL_DISPATCH ossl_ec_keymgmt_functions[] = {
1320     { OSSL_FUNC_KEYMGMT_NEW, (void (*)(void))ec_newdata },
1321     { OSSL_FUNC_KEYMGMT_GEN_INIT, (void (*)(void))ec_gen_init },
1322     { OSSL_FUNC_KEYMGMT_GEN_SET_TEMPLATE,
1323       (void (*)(void))ec_gen_set_template },
1324     { OSSL_FUNC_KEYMGMT_GEN_SET_PARAMS, (void (*)(void))ec_gen_set_params },
1325     { OSSL_FUNC_KEYMGMT_GEN_SETTABLE_PARAMS,
1326       (void (*)(void))ec_gen_settable_params },
1327     { OSSL_FUNC_KEYMGMT_GEN, (void (*)(void))ec_gen },
1328     { OSSL_FUNC_KEYMGMT_GEN_CLEANUP, (void (*)(void))ec_gen_cleanup },
1329     { OSSL_FUNC_KEYMGMT_LOAD, (void (*)(void))ec_load },
1330     { OSSL_FUNC_KEYMGMT_FREE, (void (*)(void))ec_freedata },
1331     { OSSL_FUNC_KEYMGMT_GET_PARAMS, (void (*) (void))ec_get_params },
1332     { OSSL_FUNC_KEYMGMT_GETTABLE_PARAMS, (void (*) (void))ec_gettable_params },
1333     { OSSL_FUNC_KEYMGMT_SET_PARAMS, (void (*) (void))ec_set_params },
1334     { OSSL_FUNC_KEYMGMT_SETTABLE_PARAMS, (void (*) (void))ec_settable_params },
1335     { OSSL_FUNC_KEYMGMT_HAS, (void (*)(void))ec_has },
1336     { OSSL_FUNC_KEYMGMT_MATCH, (void (*)(void))ec_match },
1337     { OSSL_FUNC_KEYMGMT_VALIDATE, (void (*)(void))ec_validate },
1338     { OSSL_FUNC_KEYMGMT_IMPORT, (void (*)(void))ec_import },
1339     { OSSL_FUNC_KEYMGMT_IMPORT_TYPES, (void (*)(void))ec_import_types },
1340     { OSSL_FUNC_KEYMGMT_EXPORT, (void (*)(void))ec_export },
1341     { OSSL_FUNC_KEYMGMT_EXPORT_TYPES, (void (*)(void))ec_export_types },
1342     { OSSL_FUNC_KEYMGMT_QUERY_OPERATION_NAME,
1343       (void (*)(void))ec_query_operation_name },
1344     { 0, NULL }
1345 };
1346
1347 #ifndef FIPS_MODULE
1348 # ifndef OPENSSL_NO_SM2
1349 const OSSL_DISPATCH ossl_sm2_keymgmt_functions[] = {
1350     { OSSL_FUNC_KEYMGMT_NEW, (void (*)(void))ec_newdata },
1351     { OSSL_FUNC_KEYMGMT_GEN_INIT, (void (*)(void))ec_gen_init },
1352     { OSSL_FUNC_KEYMGMT_GEN_SET_TEMPLATE,
1353       (void (*)(void))ec_gen_set_template },
1354     { OSSL_FUNC_KEYMGMT_GEN_SET_PARAMS, (void (*)(void))ec_gen_set_params },
1355     { OSSL_FUNC_KEYMGMT_GEN_SETTABLE_PARAMS,
1356       (void (*)(void))ec_gen_settable_params },
1357     { OSSL_FUNC_KEYMGMT_GEN, (void (*)(void))sm2_gen },
1358     { OSSL_FUNC_KEYMGMT_GEN_CLEANUP, (void (*)(void))ec_gen_cleanup },
1359     { OSSL_FUNC_KEYMGMT_LOAD, (void (*)(void))sm2_load },
1360     { OSSL_FUNC_KEYMGMT_FREE, (void (*)(void))ec_freedata },
1361     { OSSL_FUNC_KEYMGMT_GET_PARAMS, (void (*) (void))sm2_get_params },
1362     { OSSL_FUNC_KEYMGMT_GETTABLE_PARAMS, (void (*) (void))sm2_gettable_params },
1363     { OSSL_FUNC_KEYMGMT_SET_PARAMS, (void (*) (void))ec_set_params },
1364     { OSSL_FUNC_KEYMGMT_SETTABLE_PARAMS, (void (*) (void))sm2_settable_params },
1365     { OSSL_FUNC_KEYMGMT_HAS, (void (*)(void))ec_has },
1366     { OSSL_FUNC_KEYMGMT_MATCH, (void (*)(void))ec_match },
1367     { OSSL_FUNC_KEYMGMT_VALIDATE, (void (*)(void))sm2_validate },
1368     { OSSL_FUNC_KEYMGMT_IMPORT, (void (*)(void))sm2_import },
1369     { OSSL_FUNC_KEYMGMT_IMPORT_TYPES, (void (*)(void))ec_import_types },
1370     { OSSL_FUNC_KEYMGMT_EXPORT, (void (*)(void))ec_export },
1371     { OSSL_FUNC_KEYMGMT_EXPORT_TYPES, (void (*)(void))ec_export_types },
1372     { OSSL_FUNC_KEYMGMT_QUERY_OPERATION_NAME,
1373       (void (*)(void))sm2_query_operation_name },
1374     { 0, NULL }
1375 };
1376 # endif
1377 #endif