providers/implementations/keymgmt/ec_kmgmt.c

   1 /*
   2  * Copyright 2020-2022 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 <string.h>
  17 #include <openssl/core_dispatch.h>
  18 #include <openssl/core_names.h>
  19 #include <openssl/bn.h>
  20 #include <openssl/err.h>
  21 #include <openssl/objects.h>
  22 #include <openssl/proverr.h>
  23 #include "crypto/bn.h"
  24 #include "crypto/ec.h"
  25 #include "prov/implementations.h"
  26 #include "prov/providercommon.h"
  27 #include "prov/provider_ctx.h"
  28 #include "internal/param_build_set.h"
  29
  30 #ifndef FIPS_MODULE
  31 # ifndef OPENSSL_NO_SM2
  32 #  include "crypto/sm2.h"
  33 # endif
  34 #endif
  35
  36 static OSSL_FUNC_keymgmt_new_fn ec_newdata;
  37 static OSSL_FUNC_keymgmt_gen_init_fn ec_gen_init;
  38 static OSSL_FUNC_keymgmt_gen_set_template_fn ec_gen_set_template;
  39 static OSSL_FUNC_keymgmt_gen_set_params_fn ec_gen_set_params;
  40 static OSSL_FUNC_keymgmt_gen_settable_params_fn ec_gen_settable_params;
  41 static OSSL_FUNC_keymgmt_gen_fn ec_gen;
  42 static OSSL_FUNC_keymgmt_gen_cleanup_fn ec_gen_cleanup;
  43 static OSSL_FUNC_keymgmt_load_fn ec_load;
  44 static OSSL_FUNC_keymgmt_free_fn ec_freedata;
  45 static OSSL_FUNC_keymgmt_get_params_fn ec_get_params;
  46 static OSSL_FUNC_keymgmt_gettable_params_fn ec_gettable_params;
  47 static OSSL_FUNC_keymgmt_set_params_fn ec_set_params;
  48 static OSSL_FUNC_keymgmt_settable_params_fn ec_settable_params;
  49 static OSSL_FUNC_keymgmt_has_fn ec_has;
  50 static OSSL_FUNC_keymgmt_match_fn ec_match;
  51 static OSSL_FUNC_keymgmt_validate_fn ec_validate;
  52 static OSSL_FUNC_keymgmt_import_fn ec_import;
  53 static OSSL_FUNC_keymgmt_import_types_fn ec_import_types;
  54 static OSSL_FUNC_keymgmt_export_fn ec_export;
  55 static OSSL_FUNC_keymgmt_export_types_fn ec_export_types;
  56 static OSSL_FUNC_keymgmt_query_operation_name_fn ec_query_operation_name;
  57 static OSSL_FUNC_keymgmt_dup_fn ec_dup;
  58 #ifndef FIPS_MODULE
  59 # ifndef OPENSSL_NO_SM2
  60 static OSSL_FUNC_keymgmt_new_fn sm2_newdata;
  61 static OSSL_FUNC_keymgmt_gen_init_fn sm2_gen_init;
  62 static OSSL_FUNC_keymgmt_gen_fn sm2_gen;
  63 static OSSL_FUNC_keymgmt_get_params_fn sm2_get_params;
  64 static OSSL_FUNC_keymgmt_gettable_params_fn sm2_gettable_params;
  65 static OSSL_FUNC_keymgmt_settable_params_fn sm2_settable_params;
  66 static OSSL_FUNC_keymgmt_import_fn sm2_import;
  67 static OSSL_FUNC_keymgmt_query_operation_name_fn sm2_query_operation_name;
  68 static OSSL_FUNC_keymgmt_validate_fn sm2_validate;
  69 # endif
  70 #endif
  71
  72 #define EC_DEFAULT_MD "SHA256"
  73 #define EC_POSSIBLE_SELECTIONS                                                 \
  74     (OSSL_KEYMGMT_SELECT_KEYPAIR | OSSL_KEYMGMT_SELECT_ALL_PARAMETERS)
  75 #define SM2_DEFAULT_MD "SM3"
  76
  77 static
  78 const char *ec_query_operation_name(int operation_id)
  79 {
  80     switch (operation_id) {
  81     case OSSL_OP_KEYEXCH:
  82         return "ECDH";
  83     case OSSL_OP_SIGNATURE:
  84         return "ECDSA";
  85     }
  86     return NULL;
  87 }
  88
  89 #ifndef FIPS_MODULE
  90 # ifndef OPENSSL_NO_SM2
  91 static
  92 const char *sm2_query_operation_name(int operation_id)
  93 {
  94     switch (operation_id) {
  95     case OSSL_OP_SIGNATURE:
  96         return "SM2";
  97     }
  98     return NULL;
  99 }
 100 # endif
 101 #endif
 102
 103 /*
 104  * Callers of key_to_params MUST make sure that domparams_to_params is also
 105  * called!
 106  *
 107  * This function only exports the bare keypair, domain parameters and other
 108  * parameters are exported separately.
 109  */
 110 static ossl_inline
 111 int key_to_params(const EC_KEY *eckey, OSSL_PARAM_BLD *tmpl,
 112                   OSSL_PARAM params[], int include_private,
 113                   unsigned char **pub_key)
 114 {
 115     BIGNUM *x = NULL, *y = NULL;
 116     const BIGNUM *priv_key = NULL;
 117     const EC_POINT *pub_point = NULL;
 118     const EC_GROUP *ecg = NULL;
 119     size_t pub_key_len = 0;
 120     int ret = 0;
 121     BN_CTX *bnctx = NULL;
 122
 123     if (eckey == NULL
 124         || (ecg = EC_KEY_get0_group(eckey)) == NULL)
 125         return 0;
 126
 127     priv_key = EC_KEY_get0_private_key(eckey);
 128     pub_point = EC_KEY_get0_public_key(eckey);
 129
 130     if (pub_point != NULL) {
 131         OSSL_PARAM *p = NULL, *px = NULL, *py = NULL;
 132         /*
 133          * EC_POINT_point2buf() can generate random numbers in some
 134          * implementations so we need to ensure we use the correct libctx.
 135          */
 136         bnctx = BN_CTX_new_ex(ossl_ec_key_get_libctx(eckey));
 137         if (bnctx == NULL)
 138             goto err;
 139
 140
 141         /* If we are doing a get then check first before decoding the point */
 142         if (tmpl == NULL) {
 143             p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_PUB_KEY);
 144             px = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_EC_PUB_X);
 145             py = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_EC_PUB_Y);
 146         }
 147
 148         if (p != NULL || tmpl != NULL) {
 149             /* convert pub_point to a octet string according to the SECG standard */
 150             if ((pub_key_len = EC_POINT_point2buf(ecg, pub_point,
 151                                                   POINT_CONVERSION_COMPRESSED,
 152                                                   pub_key, bnctx)) == 0
 153                 || !ossl_param_build_set_octet_string(tmpl, p,
 154                                                       OSSL_PKEY_PARAM_PUB_KEY,
 155                                                       *pub_key, pub_key_len))
 156                 goto err;
 157         }
 158         if (px != NULL || py != NULL) {
 159             if (px != NULL)
 160                 x = BN_CTX_get(bnctx);
 161             if (py != NULL)
 162                 y = BN_CTX_get(bnctx);
 163
 164             if (!EC_POINT_get_affine_coordinates(ecg, pub_point, x, y, bnctx))
 165                 goto err;
 166             if (px != NULL
 167                 && !ossl_param_build_set_bn(tmpl, px,
 168                                             OSSL_PKEY_PARAM_EC_PUB_X, x))
 169                 goto err;
 170             if (py != NULL
 171                 && !ossl_param_build_set_bn(tmpl, py,
 172                                             OSSL_PKEY_PARAM_EC_PUB_Y, y))
 173                 goto err;
 174         }
 175     }
 176
 177     if (priv_key != NULL && include_private) {
 178         size_t sz;
 179         int ecbits;
 180
 181         /*
 182          * Key import/export should never leak the bit length of the secret
 183          * scalar in the key.
 184          *
 185          * For this reason, on export we use padded BIGNUMs with fixed length.
 186          *
 187          * When importing we also should make sure that, even if short lived,
 188          * the newly created BIGNUM is marked with the BN_FLG_CONSTTIME flag as
 189          * soon as possible, so that any processing of this BIGNUM might opt for
 190          * constant time implementations in the backend.
 191          *
 192          * Setting the BN_FLG_CONSTTIME flag alone is never enough, we also have
 193          * to preallocate the BIGNUM internal buffer to a fixed public size big
 194          * enough that operations performed during the processing never trigger
 195          * a realloc which would leak the size of the scalar through memory
 196          * accesses.
 197          *
 198          * Fixed Length
 199          * ------------
 200          *
 201          * The order of the large prime subgroup of the curve is our choice for
 202          * a fixed public size, as that is generally the upper bound for
 203          * generating a private key in EC cryptosystems and should fit all valid
 204          * secret scalars.
 205          *
 206          * For padding on export we just use the bit length of the order
 207          * converted to bytes (rounding up).
 208          *
 209          * For preallocating the BIGNUM storage we look at the number of "words"
 210          * required for the internal representation of the order, and we
 211          * preallocate 2 extra "words" in case any of the subsequent processing
 212          * might temporarily overflow the order length.
 213          */
 214         ecbits = EC_GROUP_order_bits(ecg);
 215         if (ecbits <= 0)
 216             goto err;
 217         sz = (ecbits + 7) / 8;
 218
 219         if (!ossl_param_build_set_bn_pad(tmpl, params,
 220                                          OSSL_PKEY_PARAM_PRIV_KEY,
 221                                          priv_key, sz))
 222             goto err;
 223     }
 224     ret = 1;
 225  err:
 226     BN_CTX_free(bnctx);
 227     return ret;
 228 }
 229
 230 static ossl_inline
 231 int otherparams_to_params(const EC_KEY *ec, OSSL_PARAM_BLD *tmpl,
 232                           OSSL_PARAM params[])
 233 {
 234     int ecdh_cofactor_mode = 0, group_check = 0;
 235     const char *name = NULL;
 236     point_conversion_form_t format;
 237
 238     if (ec == NULL)
 239         return 0;
 240
 241     format = EC_KEY_get_conv_form(ec);
 242     name = ossl_ec_pt_format_id2name((int)format);
 243     if (name != NULL
 244         && !ossl_param_build_set_utf8_string(tmpl, params,
 245                                              OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT,
 246                                              name))
 247         return 0;
 248
 249     group_check = EC_KEY_get_flags(ec) & EC_FLAG_CHECK_NAMED_GROUP_MASK;
 250     name = ossl_ec_check_group_type_id2name(group_check);
 251     if (name != NULL
 252         && !ossl_param_build_set_utf8_string(tmpl, params,
 253                                              OSSL_PKEY_PARAM_EC_GROUP_CHECK_TYPE,
 254                                              name))
 255         return 0;
 256
 257     if ((EC_KEY_get_enc_flags(ec) & EC_PKEY_NO_PUBKEY) != 0
 258             && !ossl_param_build_set_int(tmpl, params,
 259                                          OSSL_PKEY_PARAM_EC_INCLUDE_PUBLIC, 0))
 260         return 0;
 261
 262     ecdh_cofactor_mode =
 263         (EC_KEY_get_flags(ec) & EC_FLAG_COFACTOR_ECDH) ? 1 : 0;
 264     return ossl_param_build_set_int(tmpl, params,
 265                                     OSSL_PKEY_PARAM_USE_COFACTOR_ECDH,
 266                                     ecdh_cofactor_mode);
 267 }
 268
 269 static
 270 void *ec_newdata(void *provctx)
 271 {
 272     if (!ossl_prov_is_running())
 273         return NULL;
 274     return EC_KEY_new_ex(PROV_LIBCTX_OF(provctx), NULL);
 275 }
 276
 277 #ifndef FIPS_MODULE
 278 # ifndef OPENSSL_NO_SM2
 279 static
 280 void *sm2_newdata(void *provctx)
 281 {
 282     if (!ossl_prov_is_running())
 283         return NULL;
 284     return EC_KEY_new_by_curve_name_ex(PROV_LIBCTX_OF(provctx), NULL, NID_sm2);
 285 }
 286 # endif
 287 #endif
 288
 289 static
 290 void ec_freedata(void *keydata)
 291 {
 292     EC_KEY_free(keydata);
 293 }
 294
 295 static
 296 int ec_has(const void *keydata, int selection)
 297 {
 298     const EC_KEY *ec = keydata;
 299     int ok = 1;
 300
 301     if (!ossl_prov_is_running() || ec == NULL)
 302         return 0;
 303     if ((selection & EC_POSSIBLE_SELECTIONS) == 0)
 304         return 1; /* the selection is not missing */
 305
 306     if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
 307         ok = ok && (EC_KEY_get0_public_key(ec) != NULL);
 308     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 309         ok = ok && (EC_KEY_get0_private_key(ec) != NULL);
 310     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
 311         ok = ok && (EC_KEY_get0_group(ec) != NULL);
 312     /*
 313      * We consider OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS to always be
 314      * available, so no extra check is needed other than the previous one
 315      * against EC_POSSIBLE_SELECTIONS.
 316      */
 317     return ok;
 318 }
 319
 320 static int ec_match(const void *keydata1, const void *keydata2, int selection)
 321 {
 322     const EC_KEY *ec1 = keydata1;
 323     const EC_KEY *ec2 = keydata2;
 324     const EC_GROUP *group_a = EC_KEY_get0_group(ec1);
 325     const EC_GROUP *group_b = EC_KEY_get0_group(ec2);
 326     BN_CTX *ctx = NULL;
 327     int ok = 1;
 328
 329     if (!ossl_prov_is_running())
 330         return 0;
 331
 332     ctx = BN_CTX_new_ex(ossl_ec_key_get_libctx(ec1));
 333     if (ctx == NULL)
 334         return 0;
 335
 336     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
 337         ok = ok && group_a != NULL && group_b != NULL
 338             && EC_GROUP_cmp(group_a, group_b, ctx) == 0;
 339     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0) {
 340         int key_checked = 0;
 341
 342         if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0) {
 343             const EC_POINT *pa = EC_KEY_get0_public_key(ec1);
 344             const EC_POINT *pb = EC_KEY_get0_public_key(ec2);
 345
 346             if (pa != NULL && pb != NULL) {
 347                 ok = ok && EC_POINT_cmp(group_b, pa, pb, ctx) == 0;
 348                 key_checked = 1;
 349             }
 350         }
 351         if (!key_checked
 352             && (selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0) {
 353             const BIGNUM *pa = EC_KEY_get0_private_key(ec1);
 354             const BIGNUM *pb = EC_KEY_get0_private_key(ec2);
 355
 356             if (pa != NULL && pb != NULL) {
 357                 ok = ok && BN_cmp(pa, pb) == 0;
 358                 key_checked = 1;
 359             }
 360         }
 361         ok = ok && key_checked;
 362     }
 363     BN_CTX_free(ctx);
 364     return ok;
 365 }
 366
 367 static int common_check_sm2(const EC_KEY *ec, int sm2_wanted)
 368 {
 369     const EC_GROUP *ecg = NULL;
 370
 371     /*
 372      * sm2_wanted: import the keys or domparams only on SM2 Curve
 373      * !sm2_wanted: import the keys or domparams only not on SM2 Curve
 374      */
 375     if ((ecg = EC_KEY_get0_group(ec)) == NULL
 376         || (sm2_wanted ^ (EC_GROUP_get_curve_name(ecg) == NID_sm2)))
 377         return 0;
 378     return 1;
 379 }
 380
 381 static
 382 int common_import(void *keydata, int selection, const OSSL_PARAM params[],
 383                   int sm2_wanted)
 384 {
 385     EC_KEY *ec = keydata;
 386     int ok = 1;
 387
 388     if (!ossl_prov_is_running() || ec == NULL)
 389         return 0;
 390
 391     /*
 392      * In this implementation, we can export/import only keydata in the
 393      * following combinations:
 394      *   - domain parameters (+optional other params)
 395      *   - public key with associated domain parameters (+optional other params)
 396      *   - private key with associated domain parameters and optional public key
 397      *         (+optional other params)
 398      *
 399      * This means:
 400      *   - domain parameters must always be requested
 401      *   - private key must be requested alongside public key
 402      *   - other parameters are always optional
 403      */
 404     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) == 0)
 405         return 0;
 406
 407     ok = ok && ossl_ec_group_fromdata(ec, params);
 408
 409     if (!common_check_sm2(ec, sm2_wanted))
 410         return 0;
 411
 412     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0) {
 413         int include_private =
 414             selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY ? 1 : 0;
 415
 416         ok = ok && ossl_ec_key_fromdata(ec, params, include_private);
 417     }
 418     if ((selection & OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS) != 0)
 419         ok = ok && ossl_ec_key_otherparams_fromdata(ec, params);
 420
 421     return ok;
 422 }
 423
 424 static
 425 int ec_import(void *keydata, int selection, const OSSL_PARAM params[])
 426 {
 427     return common_import(keydata, selection, params, 0);
 428 }
 429
 430 #ifndef FIPS_MODULE
 431 # ifndef OPENSSL_NO_SM2
 432 static
 433 int sm2_import(void *keydata, int selection, const OSSL_PARAM params[])
 434 {
 435     return common_import(keydata, selection, params, 1);
 436 }
 437 # endif
 438 #endif
 439
 440 static
 441 int ec_export(void *keydata, int selection, OSSL_CALLBACK *param_cb,
 442               void *cbarg)
 443 {
 444     EC_KEY *ec = keydata;
 445     OSSL_PARAM_BLD *tmpl = NULL;
 446     OSSL_PARAM *params = NULL;
 447     unsigned char *pub_key = NULL, *genbuf = NULL;
 448     BN_CTX *bnctx = NULL;
 449     int ok = 1;
 450
 451     if (!ossl_prov_is_running() || ec == NULL)
 452         return 0;
 453
 454     /*
 455      * In this implementation, we can export/import only keydata in the
 456      * following combinations:
 457      *   - domain parameters (+optional other params)
 458      *   - public key with associated domain parameters (+optional other params)
 459      *   - private key with associated public key and domain parameters
 460      *         (+optional other params)
 461      *
 462      * This means:
 463      *   - domain parameters must always be requested
 464      *   - private key must be requested alongside public key
 465      *   - other parameters are always optional
 466      */
 467     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) == 0)
 468         return 0;
 469     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0
 470             && (selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) == 0)
 471         return 0;
 472
 473     tmpl = OSSL_PARAM_BLD_new();
 474     if (tmpl == NULL)
 475         return 0;
 476
 477     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0) {
 478         bnctx = BN_CTX_new_ex(ossl_ec_key_get_libctx(ec));
 479         if (bnctx == NULL) {
 480             ok = 0;
 481             goto end;
 482         }
 483         BN_CTX_start(bnctx);
 484         ok = ok && ossl_ec_group_todata(EC_KEY_get0_group(ec), tmpl, NULL,
 485                                         ossl_ec_key_get_libctx(ec),
 486                                         ossl_ec_key_get0_propq(ec),
 487                                         bnctx, &genbuf);
 488     }
 489
 490     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0) {
 491         int include_private =
 492             selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY ? 1 : 0;
 493
 494         ok = ok && key_to_params(ec, tmpl, NULL, include_private, &pub_key);
 495     }
 496     if ((selection & OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS) != 0)
 497         ok = ok && otherparams_to_params(ec, tmpl, NULL);
 498
 499     if (ok && (params = OSSL_PARAM_BLD_to_param(tmpl)) != NULL)
 500         ok = param_cb(params, cbarg);
 501 end:
 502     OSSL_PARAM_free(params);
 503     OSSL_PARAM_BLD_free(tmpl);
 504     OPENSSL_free(pub_key);
 505     OPENSSL_free(genbuf);
 506     BN_CTX_end(bnctx);
 507     BN_CTX_free(bnctx);
 508     return ok;
 509 }
 510
 511 /* IMEXPORT = IMPORT + EXPORT */
 512
 513 # define EC_IMEXPORTABLE_DOM_PARAMETERS                                        \
 514     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_GROUP_NAME, NULL, 0),               \
 515     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_EC_ENCODING, NULL, 0),              \
 516     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT, NULL, 0),\
 517     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_EC_FIELD_TYPE, NULL, 0),            \
 518     OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_P, NULL, 0),                              \
 519     OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_A, NULL, 0),                              \
 520     OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_B, NULL, 0),                              \
 521     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_EC_GENERATOR, NULL, 0),            \
 522     OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_ORDER, NULL, 0),                          \
 523     OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_COFACTOR, NULL, 0),                       \
 524     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_EC_SEED, NULL, 0)
 525
 526 # define EC_IMEXPORTABLE_PUBLIC_KEY                                            \
 527     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_PUB_KEY, NULL, 0)
 528 # define EC_IMEXPORTABLE_PRIVATE_KEY                                           \
 529     OSSL_PARAM_BN(OSSL_PKEY_PARAM_PRIV_KEY, NULL, 0)
 530 # define EC_IMEXPORTABLE_OTHER_PARAMETERS                                      \
 531     OSSL_PARAM_int(OSSL_PKEY_PARAM_USE_COFACTOR_ECDH, NULL),                   \
 532     OSSL_PARAM_int(OSSL_PKEY_PARAM_EC_INCLUDE_PUBLIC, NULL)
 533
 534 /*
 535  * Include all the possible combinations of OSSL_PARAM arrays for
 536  * ec_imexport_types().
 537  *
 538  * They are in a separate file as it is ~100 lines of unreadable and
 539  * uninteresting machine generated stuff.
 540  */
 541 #include "ec_kmgmt_imexport.inc"
 542
 543 static ossl_inline
 544 const OSSL_PARAM *ec_imexport_types(int selection)
 545 {
 546     int type_select = 0;
 547
 548     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 549         type_select += 1;
 550     if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
 551         type_select += 2;
 552     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
 553         type_select += 4;
 554     if ((selection & OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS) != 0)
 555         type_select += 8;
 556     return ec_types[type_select];
 557 }
 558
 559 static
 560 const OSSL_PARAM *ec_import_types(int selection)
 561 {
 562     return ec_imexport_types(selection);
 563 }
 564
 565 static
 566 const OSSL_PARAM *ec_export_types(int selection)
 567 {
 568     return ec_imexport_types(selection);
 569 }
 570
 571 static int ec_get_ecm_params(const EC_GROUP *group, OSSL_PARAM params[])
 572 {
 573 #ifdef OPENSSL_NO_EC2M
 574     return 1;
 575 #else
 576     int ret = 0, m;
 577     unsigned int k1 = 0, k2 = 0, k3 = 0;
 578     int basis_nid;
 579     const char *basis_name = NULL;
 580     int fid = EC_GROUP_get_field_type(group);
 581
 582     if (fid != NID_X9_62_characteristic_two_field)
 583         return 1;
 584
 585     basis_nid = EC_GROUP_get_basis_type(group);
 586     if (basis_nid == NID_X9_62_tpBasis)
 587         basis_name = SN_X9_62_tpBasis;
 588     else if (basis_nid == NID_X9_62_ppBasis)
 589         basis_name = SN_X9_62_ppBasis;
 590     else
 591         goto err;
 592
 593     m = EC_GROUP_get_degree(group);
 594     if (!ossl_param_build_set_int(NULL, params, OSSL_PKEY_PARAM_EC_CHAR2_M, m)
 595         || !ossl_param_build_set_utf8_string(NULL, params,
 596                                              OSSL_PKEY_PARAM_EC_CHAR2_TYPE,
 597                                              basis_name))
 598         goto err;
 599
 600     if (basis_nid == NID_X9_62_tpBasis) {
 601         if (!EC_GROUP_get_trinomial_basis(group, &k1)
 602             || !ossl_param_build_set_int(NULL, params,
 603                                          OSSL_PKEY_PARAM_EC_CHAR2_TP_BASIS,
 604                                          (int)k1))
 605             goto err;
 606     } else {
 607         if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3)
 608             || !ossl_param_build_set_int(NULL, params,
 609                                          OSSL_PKEY_PARAM_EC_CHAR2_PP_K1, (int)k1)
 610             || !ossl_param_build_set_int(NULL, params,
 611                                          OSSL_PKEY_PARAM_EC_CHAR2_PP_K2, (int)k2)
 612             || !ossl_param_build_set_int(NULL, params,
 613                                          OSSL_PKEY_PARAM_EC_CHAR2_PP_K3, (int)k3))
 614             goto err;
 615     }
 616     ret = 1;
 617 err:
 618     return ret;
 619 #endif /* OPENSSL_NO_EC2M */
 620 }
 621
 622 static
 623 int common_get_params(void *key, OSSL_PARAM params[], int sm2)
 624 {
 625     int ret = 0;
 626     EC_KEY *eck = key;
 627     const EC_GROUP *ecg = NULL;
 628     OSSL_PARAM *p;
 629     unsigned char *pub_key = NULL, *genbuf = NULL;
 630     OSSL_LIB_CTX *libctx;
 631     const char *propq;
 632     BN_CTX *bnctx = NULL;
 633
 634     ecg = EC_KEY_get0_group(eck);
 635     if (ecg == NULL)
 636         return 0;
 637
 638     libctx = ossl_ec_key_get_libctx(eck);
 639     propq = ossl_ec_key_get0_propq(eck);
 640
 641     bnctx = BN_CTX_new_ex(libctx);
 642     if (bnctx == NULL)
 643         return 0;
 644     BN_CTX_start(bnctx);
 645
 646     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_MAX_SIZE)) != NULL
 647         && !OSSL_PARAM_set_int(p, ECDSA_size(eck)))
 648         goto err;
 649     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_BITS)) != NULL
 650         && !OSSL_PARAM_set_int(p, EC_GROUP_order_bits(ecg)))
 651         goto err;
 652     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_SECURITY_BITS)) != NULL) {
 653         int ecbits, sec_bits;
 654
 655         ecbits = EC_GROUP_order_bits(ecg);
 656
 657         /*
 658          * The following estimates are based on the values published
 659          * in Table 2 of "NIST Special Publication 800-57 Part 1 Revision 4"
 660          * at http://dx.doi.org/10.6028/NIST.SP.800-57pt1r4 .
 661          *
 662          * Note that the above reference explicitly categorizes algorithms in a
 663          * discrete set of values {80, 112, 128, 192, 256}, and that it is
 664          * relevant only for NIST approved Elliptic Curves, while OpenSSL
 665          * applies the same logic also to other curves.
 666          *
 667          * Classifications produced by other standardazing bodies might differ,
 668          * so the results provided for "bits of security" by this provider are
 669          * to be considered merely indicative, and it is the users'
 670          * responsibility to compare these values against the normative
 671          * references that may be relevant for their intent and purposes.
 672          */
 673         if (ecbits >= 512)
 674             sec_bits = 256;
 675         else if (ecbits >= 384)
 676             sec_bits = 192;
 677         else if (ecbits >= 256)
 678             sec_bits = 128;
 679         else if (ecbits >= 224)
 680             sec_bits = 112;
 681         else if (ecbits >= 160)
 682             sec_bits = 80;
 683         else
 684             sec_bits = ecbits / 2;
 685
 686         if (!OSSL_PARAM_set_int(p, sec_bits))
 687             goto err;
 688     }
 689
 690     if ((p = OSSL_PARAM_locate(params,
 691                                OSSL_PKEY_PARAM_EC_DECODED_FROM_EXPLICIT_PARAMS))
 692             != NULL) {
 693         int explicitparams = EC_KEY_decoded_from_explicit_params(eck);
 694
 695         if (explicitparams < 0
 696              || !OSSL_PARAM_set_int(p, explicitparams))
 697             goto err;
 698     }
 699
 700     if (!sm2) {
 701         if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_DEFAULT_DIGEST)) != NULL
 702                 && !OSSL_PARAM_set_utf8_string(p, EC_DEFAULT_MD))
 703             goto err;
 704     } else {
 705         if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_DEFAULT_DIGEST)) != NULL
 706                 && !OSSL_PARAM_set_utf8_string(p, SM2_DEFAULT_MD))
 707             goto err;
 708     }
 709
 710     /* SM2 doesn't support this PARAM */
 711     if (!sm2) {
 712         p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_USE_COFACTOR_ECDH);
 713         if (p != NULL) {
 714             int ecdh_cofactor_mode = 0;
 715
 716             ecdh_cofactor_mode =
 717                 (EC_KEY_get_flags(eck) & EC_FLAG_COFACTOR_ECDH) ? 1 : 0;
 718
 719             if (!OSSL_PARAM_set_int(p, ecdh_cofactor_mode))
 720                 goto err;
 721         }
 722     }
 723     if ((p = OSSL_PARAM_locate(params,
 724                                OSSL_PKEY_PARAM_ENCODED_PUBLIC_KEY)) != NULL) {
 725         p->return_size = EC_POINT_point2oct(EC_KEY_get0_group(key),
 726                                             EC_KEY_get0_public_key(key),
 727                                             POINT_CONVERSION_UNCOMPRESSED,
 728                                             p->data, p->return_size, bnctx);
 729         if (p->return_size == 0)
 730             goto err;
 731     }
 732
 733     ret = ec_get_ecm_params(ecg, params)
 734           && ossl_ec_group_todata(ecg, NULL, params, libctx, propq, bnctx,
 735                                   &genbuf)
 736           && key_to_params(eck, NULL, params, 1, &pub_key)
 737           && otherparams_to_params(eck, NULL, params);
 738 err:
 739     OPENSSL_free(genbuf);
 740     OPENSSL_free(pub_key);
 741     BN_CTX_end(bnctx);
 742     BN_CTX_free(bnctx);
 743     return ret;
 744 }
 745
 746 static
 747 int ec_get_params(void *key, OSSL_PARAM params[])
 748 {
 749     return common_get_params(key, params, 0);
 750 }
 751
 752 #ifndef OPENSSL_NO_EC2M
 753 # define EC2M_GETTABLE_DOM_PARAMS                                              \
 754         OSSL_PARAM_int(OSSL_PKEY_PARAM_EC_CHAR2_M, NULL),                      \
 755         OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_EC_CHAR2_TYPE, NULL, 0),        \
 756         OSSL_PARAM_int(OSSL_PKEY_PARAM_EC_CHAR2_TP_BASIS, NULL),               \
 757         OSSL_PARAM_int(OSSL_PKEY_PARAM_EC_CHAR2_PP_K1, NULL),                  \
 758         OSSL_PARAM_int(OSSL_PKEY_PARAM_EC_CHAR2_PP_K2, NULL),                  \
 759         OSSL_PARAM_int(OSSL_PKEY_PARAM_EC_CHAR2_PP_K3, NULL),
 760 #else
 761 # define EC2M_GETTABLE_DOM_PARAMS
 762 #endif
 763
 764 static const OSSL_PARAM ec_known_gettable_params[] = {
 765     OSSL_PARAM_int(OSSL_PKEY_PARAM_BITS, NULL),
 766     OSSL_PARAM_int(OSSL_PKEY_PARAM_SECURITY_BITS, NULL),
 767     OSSL_PARAM_int(OSSL_PKEY_PARAM_MAX_SIZE, NULL),
 768     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_DEFAULT_DIGEST, NULL, 0),
 769     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_ENCODED_PUBLIC_KEY, NULL, 0),
 770     OSSL_PARAM_int(OSSL_PKEY_PARAM_EC_DECODED_FROM_EXPLICIT_PARAMS, NULL),
 771     EC_IMEXPORTABLE_DOM_PARAMETERS,
 772     EC2M_GETTABLE_DOM_PARAMS
 773     EC_IMEXPORTABLE_PUBLIC_KEY,
 774     OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_PUB_X, NULL, 0),
 775     OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_PUB_Y, NULL, 0),
 776     EC_IMEXPORTABLE_PRIVATE_KEY,
 777     EC_IMEXPORTABLE_OTHER_PARAMETERS,
 778     OSSL_PARAM_END
 779 };
 780
 781 static
 782 const OSSL_PARAM *ec_gettable_params(void *provctx)
 783 {
 784     return ec_known_gettable_params;
 785 }
 786
 787 static const OSSL_PARAM ec_known_settable_params[] = {
 788     OSSL_PARAM_int(OSSL_PKEY_PARAM_USE_COFACTOR_ECDH, NULL),
 789     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_ENCODED_PUBLIC_KEY, NULL, 0),
 790     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_EC_ENCODING, NULL, 0),
 791     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT, NULL, 0),
 792     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_EC_SEED, NULL, 0),
 793     OSSL_PARAM_int(OSSL_PKEY_PARAM_EC_INCLUDE_PUBLIC, NULL),
 794     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_EC_GROUP_CHECK_TYPE, NULL, 0),
 795     OSSL_PARAM_END
 796 };
 797
 798 static
 799 const OSSL_PARAM *ec_settable_params(void *provctx)
 800 {
 801     return ec_known_settable_params;
 802 }
 803
 804 static
 805 int ec_set_params(void *key, const OSSL_PARAM params[])
 806 {
 807     EC_KEY *eck = key;
 808     const OSSL_PARAM *p;
 809
 810     if (key == NULL)
 811         return 0;
 812     if (params == NULL)
 813         return 1;
 814
 815
 816     if (!ossl_ec_group_set_params((EC_GROUP *)EC_KEY_get0_group(key), params))
 817         return 0;
 818
 819     p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_ENCODED_PUBLIC_KEY);
 820     if (p != NULL) {
 821         BN_CTX *ctx = BN_CTX_new_ex(ossl_ec_key_get_libctx(key));
 822         int ret = 1;
 823
 824         if (ctx == NULL
 825                 || p->data_type != OSSL_PARAM_OCTET_STRING
 826                 || !EC_KEY_oct2key(key, p->data, p->data_size, ctx))
 827             ret = 0;
 828         BN_CTX_free(ctx);
 829         if (!ret)
 830             return 0;
 831     }
 832
 833     return ossl_ec_key_otherparams_fromdata(eck, params);
 834 }
 835
 836 #ifndef FIPS_MODULE
 837 # ifndef OPENSSL_NO_SM2
 838 static
 839 int sm2_get_params(void *key, OSSL_PARAM params[])
 840 {
 841     return common_get_params(key, params, 1);
 842 }
 843
 844 static const OSSL_PARAM sm2_known_gettable_params[] = {
 845     OSSL_PARAM_int(OSSL_PKEY_PARAM_BITS, NULL),
 846     OSSL_PARAM_int(OSSL_PKEY_PARAM_SECURITY_BITS, NULL),
 847     OSSL_PARAM_int(OSSL_PKEY_PARAM_MAX_SIZE, NULL),
 848     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_DEFAULT_DIGEST, NULL, 0),
 849     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_ENCODED_PUBLIC_KEY, NULL, 0),
 850     OSSL_PARAM_int(OSSL_PKEY_PARAM_EC_DECODED_FROM_EXPLICIT_PARAMS, NULL),
 851     EC_IMEXPORTABLE_DOM_PARAMETERS,
 852     EC_IMEXPORTABLE_PUBLIC_KEY,
 853     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_EC_PUB_X, NULL, 0),
 854     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_EC_PUB_Y, NULL, 0),
 855     EC_IMEXPORTABLE_PRIVATE_KEY,
 856     OSSL_PARAM_END
 857 };
 858
 859 static
 860 const OSSL_PARAM *sm2_gettable_params(ossl_unused void *provctx)
 861 {
 862     return sm2_known_gettable_params;
 863 }
 864
 865 static const OSSL_PARAM sm2_known_settable_params[] = {
 866     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_ENCODED_PUBLIC_KEY, NULL, 0),
 867     OSSL_PARAM_END
 868 };
 869
 870 static
 871 const OSSL_PARAM *sm2_settable_params(ossl_unused void *provctx)
 872 {
 873     return sm2_known_settable_params;
 874 }
 875
 876 static
 877 int sm2_validate(const void *keydata, int selection, int checktype)
 878 {
 879     const EC_KEY *eck = keydata;
 880     int ok = 1;
 881     BN_CTX *ctx = NULL;
 882
 883     if (!ossl_prov_is_running())
 884         return 0;
 885
 886     if ((selection & EC_POSSIBLE_SELECTIONS) == 0)
 887         return 1; /* nothing to validate */
 888
 889     ctx = BN_CTX_new_ex(ossl_ec_key_get_libctx(eck));
 890     if  (ctx == NULL)
 891         return 0;
 892
 893     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
 894         ok = ok && EC_GROUP_check(EC_KEY_get0_group(eck), ctx);
 895
 896     if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0) {
 897         if (checktype == OSSL_KEYMGMT_VALIDATE_QUICK_CHECK)
 898             ok = ok && ossl_ec_key_public_check_quick(eck, ctx);
 899         else
 900             ok = ok && ossl_ec_key_public_check(eck, ctx);
 901     }
 902
 903     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 904         ok = ok && ossl_sm2_key_private_check(eck);
 905
 906     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) == OSSL_KEYMGMT_SELECT_KEYPAIR)
 907         ok = ok && ossl_ec_key_pairwise_check(eck, ctx);
 908
 909     BN_CTX_free(ctx);
 910     return ok;
 911 }
 912 # endif
 913 #endif
 914
 915 static
 916 int ec_validate(const void *keydata, int selection, int checktype)
 917 {
 918     const EC_KEY *eck = keydata;
 919     int ok = 1;
 920     BN_CTX *ctx = NULL;
 921
 922     if (!ossl_prov_is_running())
 923         return 0;
 924
 925     if ((selection & EC_POSSIBLE_SELECTIONS) == 0)
 926         return 1; /* nothing to validate */
 927
 928     ctx = BN_CTX_new_ex(ossl_ec_key_get_libctx(eck));
 929     if  (ctx == NULL)
 930         return 0;
 931
 932     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0) {
 933         int flags = EC_KEY_get_flags(eck);
 934
 935         if ((flags & EC_FLAG_CHECK_NAMED_GROUP) != 0)
 936             ok = ok && EC_GROUP_check_named_curve(EC_KEY_get0_group(eck),
 937                            (flags & EC_FLAG_CHECK_NAMED_GROUP_NIST) != 0, ctx);
 938         else
 939             ok = ok && EC_GROUP_check(EC_KEY_get0_group(eck), ctx);
 940     }
 941
 942     if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0) {
 943         if (checktype == OSSL_KEYMGMT_VALIDATE_QUICK_CHECK)
 944             ok = ok && ossl_ec_key_public_check_quick(eck, ctx);
 945         else
 946             ok = ok && ossl_ec_key_public_check(eck, ctx);
 947     }
 948
 949     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 950         ok = ok && ossl_ec_key_private_check(eck);
 951
 952     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) == OSSL_KEYMGMT_SELECT_KEYPAIR)
 953         ok = ok && ossl_ec_key_pairwise_check(eck, ctx);
 954
 955     BN_CTX_free(ctx);
 956     return ok;
 957 }
 958
 959 struct ec_gen_ctx {
 960     OSSL_LIB_CTX *libctx;
 961     char *group_name;
 962     char *encoding;
 963     char *pt_format;
 964     char *group_check;
 965     char *field_type;
 966     BIGNUM *p, *a, *b, *order, *cofactor;
 967     unsigned char *gen, *seed;
 968     size_t gen_len, seed_len;
 969     int selection;
 970     int ecdh_mode;
 971     EC_GROUP *gen_group;
 972 };
 973
 974 static void *ec_gen_init(void *provctx, int selection,
 975                          const OSSL_PARAM params[])
 976 {
 977     OSSL_LIB_CTX *libctx = PROV_LIBCTX_OF(provctx);
 978     struct ec_gen_ctx *gctx = NULL;
 979
 980     if (!ossl_prov_is_running() || (selection & (EC_POSSIBLE_SELECTIONS)) == 0)
 981         return NULL;
 982
 983     if ((gctx = OPENSSL_zalloc(sizeof(*gctx))) != NULL) {
 984         gctx->libctx = libctx;
 985         gctx->selection = selection;
 986         gctx->ecdh_mode = 0;
 987     }
 988     if (!ec_gen_set_params(gctx, params)) {
 989         OPENSSL_free(gctx);
 990         gctx = NULL;
 991     }
 992     return gctx;
 993 }
 994
 995 #ifndef FIPS_MODULE
 996 # ifndef OPENSSL_NO_SM2
 997 static void *sm2_gen_init(void *provctx, int selection,
 998                          const OSSL_PARAM params[])
 999 {
1000     struct ec_gen_ctx *gctx = ec_gen_init(provctx, selection, params);
1001
1002     if (gctx != NULL) {
1003         if (gctx->group_name != NULL)
1004             return gctx;
1005         if ((gctx->group_name = OPENSSL_strdup("sm2")) != NULL)
1006             return gctx;
1007         ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
1008         ec_gen_cleanup(gctx);
1009     }
1010     return NULL;
1011 }
1012 # endif
1013 #endif
1014
1015 static int ec_gen_set_group(void *genctx, const EC_GROUP *src)
1016 {
1017     struct ec_gen_ctx *gctx = genctx;
1018     EC_GROUP *group;
1019
1020     group = EC_GROUP_dup(src);
1021     if (group == NULL) {
1022         ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_CURVE);
1023         return 0;
1024     }
1025     EC_GROUP_free(gctx->gen_group);
1026     gctx->gen_group = group;
1027     return 1;
1028 }
1029
1030 static int ec_gen_set_template(void *genctx, void *templ)
1031 {
1032     struct ec_gen_ctx *gctx = genctx;
1033     EC_KEY *ec = templ;
1034     const EC_GROUP *ec_group;
1035
1036     if (!ossl_prov_is_running() || gctx == NULL || ec == NULL)
1037         return 0;
1038     if ((ec_group = EC_KEY_get0_group(ec)) == NULL)
1039         return 0;
1040     return ec_gen_set_group(gctx, ec_group);
1041 }
1042
1043 #define COPY_INT_PARAM(params, key, val)                                       \
1044 p = OSSL_PARAM_locate_const(params, key);                                      \
1045 if (p != NULL && !OSSL_PARAM_get_int(p, &val))                                 \
1046     goto err;
1047
1048 #define COPY_UTF8_PARAM(params, key, val)                                      \
1049 p = OSSL_PARAM_locate_const(params, key);                                      \
1050 if (p != NULL) {                                                               \
1051     if (p->data_type != OSSL_PARAM_UTF8_STRING)                                \
1052         goto err;                                                              \
1053     OPENSSL_free(val);                                                         \
1054     val = OPENSSL_strdup(p->data);                                             \
1055     if (val == NULL)                                                           \
1056         goto err;                                                              \
1057 }
1058
1059 #define COPY_OCTET_PARAM(params, key, val, len)                                \
1060 p = OSSL_PARAM_locate_const(params, key);                                      \
1061 if (p != NULL) {                                                               \
1062     if (p->data_type != OSSL_PARAM_OCTET_STRING)                               \
1063         goto err;                                                              \
1064     OPENSSL_free(val);                                                         \
1065     len = p->data_size;                                                        \
1066     val = OPENSSL_memdup(p->data, p->data_size);                               \
1067     if (val == NULL)                                                           \
1068         goto err;                                                              \
1069 }
1070
1071 #define COPY_BN_PARAM(params, key, bn)                                         \
1072 p = OSSL_PARAM_locate_const(params, key);                                      \
1073 if (p != NULL) {                                                               \
1074     if (bn == NULL)                                                            \
1075         bn = BN_new();                                                         \
1076     if (bn == NULL || !OSSL_PARAM_get_BN(p, &bn))                              \
1077         goto err;                                                              \
1078 }
1079
1080 static int ec_gen_set_params(void *genctx, const OSSL_PARAM params[])
1081 {
1082     int ret = 0;
1083     struct ec_gen_ctx *gctx = genctx;
1084     const OSSL_PARAM *p;
1085     EC_GROUP *group = NULL;
1086
1087     COPY_INT_PARAM(params, OSSL_PKEY_PARAM_USE_COFACTOR_ECDH, gctx->ecdh_mode);
1088
1089     COPY_UTF8_PARAM(params, OSSL_PKEY_PARAM_GROUP_NAME, gctx->group_name);
1090     COPY_UTF8_PARAM(params, OSSL_PKEY_PARAM_EC_FIELD_TYPE, gctx->field_type);
1091     COPY_UTF8_PARAM(params, OSSL_PKEY_PARAM_EC_ENCODING, gctx->encoding);
1092     COPY_UTF8_PARAM(params, OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT, gctx->pt_format);
1093     COPY_UTF8_PARAM(params, OSSL_PKEY_PARAM_EC_GROUP_CHECK_TYPE, gctx->group_check);
1094
1095     COPY_BN_PARAM(params, OSSL_PKEY_PARAM_EC_P, gctx->p);
1096     COPY_BN_PARAM(params, OSSL_PKEY_PARAM_EC_A, gctx->a);
1097     COPY_BN_PARAM(params, OSSL_PKEY_PARAM_EC_B, gctx->b);
1098     COPY_BN_PARAM(params, OSSL_PKEY_PARAM_EC_ORDER, gctx->order);
1099     COPY_BN_PARAM(params, OSSL_PKEY_PARAM_EC_COFACTOR, gctx->cofactor);
1100
1101     COPY_OCTET_PARAM(params, OSSL_PKEY_PARAM_EC_SEED, gctx->seed, gctx->seed_len);
1102     COPY_OCTET_PARAM(params, OSSL_PKEY_PARAM_EC_GENERATOR, gctx->gen,
1103                      gctx->gen_len);
1104
1105     ret = 1;
1106 err:
1107     EC_GROUP_free(group);
1108     return ret;
1109 }
1110
1111 static int ec_gen_set_group_from_params(struct ec_gen_ctx *gctx)
1112 {
1113     int ret = 0;
1114     OSSL_PARAM_BLD *bld;
1115     OSSL_PARAM *params = NULL;
1116     EC_GROUP *group = NULL;
1117
1118     bld = OSSL_PARAM_BLD_new();
1119     if (bld == NULL)
1120         return 0;
1121
1122     if (gctx->encoding != NULL
1123         && !OSSL_PARAM_BLD_push_utf8_string(bld, OSSL_PKEY_PARAM_EC_ENCODING,
1124                                             gctx->encoding, 0))
1125         goto err;
1126
1127     if (gctx->pt_format != NULL
1128         && !OSSL_PARAM_BLD_push_utf8_string(bld,
1129                                             OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT,
1130                                             gctx->pt_format, 0))
1131         goto err;
1132
1133     if (gctx->group_name != NULL) {
1134         if (!OSSL_PARAM_BLD_push_utf8_string(bld, OSSL_PKEY_PARAM_GROUP_NAME,
1135                                              gctx->group_name, 0))
1136             goto err;
1137         /* Ignore any other parameters if there is a group name */
1138         goto build;
1139     } else if (gctx->field_type != NULL) {
1140         if (!OSSL_PARAM_BLD_push_utf8_string(bld, OSSL_PKEY_PARAM_EC_FIELD_TYPE,
1141                                              gctx->field_type, 0))
1142             goto err;
1143     } else {
1144         goto err;
1145     }
1146     if (gctx->p == NULL
1147         || gctx->a == NULL
1148         || gctx->b == NULL
1149         || gctx->order == NULL
1150         || !OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_EC_P, gctx->p)
1151         || !OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_EC_A, gctx->a)
1152         || !OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_EC_B, gctx->b)
1153         || !OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_EC_ORDER, gctx->order))
1154         goto err;
1155
1156     if (gctx->cofactor != NULL
1157         && !OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_EC_COFACTOR,
1158                                    gctx->cofactor))
1159         goto err;
1160
1161     if (gctx->seed != NULL
1162         && !OSSL_PARAM_BLD_push_octet_string(bld, OSSL_PKEY_PARAM_EC_SEED,
1163                                              gctx->seed, gctx->seed_len))
1164         goto err;
1165
1166     if (gctx->gen == NULL
1167         || !OSSL_PARAM_BLD_push_octet_string(bld, OSSL_PKEY_PARAM_EC_GENERATOR,
1168                                              gctx->gen, gctx->gen_len))
1169         goto err;
1170 build:
1171     params = OSSL_PARAM_BLD_to_param(bld);
1172     if (params == NULL)
1173         goto err;
1174     group = EC_GROUP_new_from_params(params, gctx->libctx, NULL);
1175     if (group == NULL)
1176         goto err;
1177
1178     EC_GROUP_free(gctx->gen_group);
1179     gctx->gen_group = group;
1180
1181     ret = 1;
1182 err:
1183     OSSL_PARAM_free(params);
1184     OSSL_PARAM_BLD_free(bld);
1185     return ret;
1186 }
1187
1188 static const OSSL_PARAM *ec_gen_settable_params(ossl_unused void *genctx,
1189                                                 ossl_unused void *provctx)
1190 {
1191     static OSSL_PARAM settable[] = {
1192         OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_GROUP_NAME, NULL, 0),
1193         OSSL_PARAM_int(OSSL_PKEY_PARAM_USE_COFACTOR_ECDH, NULL),
1194         OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_EC_ENCODING, NULL, 0),
1195         OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT, NULL, 0),
1196         OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_EC_FIELD_TYPE, NULL, 0),
1197         OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_P, NULL, 0),
1198         OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_A, NULL, 0),
1199         OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_B, NULL, 0),
1200         OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_EC_GENERATOR, NULL, 0),
1201         OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_ORDER, NULL, 0),
1202         OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_COFACTOR, NULL, 0),
1203         OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_EC_SEED, NULL, 0),
1204         OSSL_PARAM_END
1205     };
1206
1207     return settable;
1208 }
1209
1210 static int ec_gen_assign_group(EC_KEY *ec, EC_GROUP *group)
1211 {
1212     if (group == NULL) {
1213         ERR_raise(ERR_LIB_PROV, PROV_R_NO_PARAMETERS_SET);
1214         return 0;
1215     }
1216     return EC_KEY_set_group(ec, group) > 0;
1217 }
1218
1219 /*
1220  * The callback arguments (osslcb & cbarg) are not used by EC_KEY generation
1221  */
1222 static void *ec_gen(void *genctx, OSSL_CALLBACK *osslcb, void *cbarg)
1223 {
1224     struct ec_gen_ctx *gctx = genctx;
1225     EC_KEY *ec = NULL;
1226     int ret = 0;
1227
1228     if (!ossl_prov_is_running()
1229         || gctx == NULL
1230         || (ec = EC_KEY_new_ex(gctx->libctx, NULL)) == NULL)
1231         return NULL;
1232
1233     if (gctx->gen_group == NULL) {
1234         if (!ec_gen_set_group_from_params(gctx))
1235             goto err;
1236     } else {
1237         if (gctx->encoding != NULL) {
1238             int flags = ossl_ec_encoding_name2id(gctx->encoding);
1239
1240             if (flags < 0)
1241                 goto err;
1242             EC_GROUP_set_asn1_flag(gctx->gen_group, flags);
1243         }
1244         if (gctx->pt_format != NULL) {
1245             int format = ossl_ec_pt_format_name2id(gctx->pt_format);
1246
1247             if (format < 0)
1248                 goto err;
1249             EC_GROUP_set_point_conversion_form(gctx->gen_group, format);
1250         }
1251     }
1252
1253     /* We must always assign a group, no matter what */
1254     ret = ec_gen_assign_group(ec, gctx->gen_group);
1255
1256     /* Whether you want it or not, you get a keypair, not just one half */
1257     if ((gctx->selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
1258         ret = ret && EC_KEY_generate_key(ec);
1259
1260     if (gctx->ecdh_mode != -1)
1261         ret = ret && ossl_ec_set_ecdh_cofactor_mode(ec, gctx->ecdh_mode);
1262
1263     if (gctx->group_check != NULL)
1264         ret = ret && ossl_ec_set_check_group_type_from_name(ec, gctx->group_check);
1265     if (ret)
1266         return ec;
1267 err:
1268     /* Something went wrong, throw the key away */
1269     EC_KEY_free(ec);
1270     return NULL;
1271 }
1272
1273 #ifndef FIPS_MODULE
1274 # ifndef OPENSSL_NO_SM2
1275 /*
1276  * The callback arguments (osslcb & cbarg) are not used by EC_KEY generation
1277  */
1278 static void *sm2_gen(void *genctx, OSSL_CALLBACK *osslcb, void *cbarg)
1279 {
1280     struct ec_gen_ctx *gctx = genctx;
1281     EC_KEY *ec = NULL;
1282     int ret = 1;
1283
1284     if (gctx == NULL
1285         || (ec = EC_KEY_new_ex(gctx->libctx, NULL)) == NULL)
1286         return NULL;
1287
1288     if (gctx->gen_group == NULL) {
1289         if (!ec_gen_set_group_from_params(gctx))
1290             goto err;
1291     } else {
1292         if (gctx->encoding) {
1293             int flags = ossl_ec_encoding_name2id(gctx->encoding);
1294
1295             if (flags < 0)
1296                 goto err;
1297             EC_GROUP_set_asn1_flag(gctx->gen_group, flags);
1298         }
1299         if (gctx->pt_format != NULL) {
1300             int format = ossl_ec_pt_format_name2id(gctx->pt_format);
1301
1302             if (format < 0)
1303                 goto err;
1304             EC_GROUP_set_point_conversion_form(gctx->gen_group, format);
1305         }
1306     }
1307
1308     /* We must always assign a group, no matter what */
1309     ret = ec_gen_assign_group(ec, gctx->gen_group);
1310
1311     /* Whether you want it or not, you get a keypair, not just one half */
1312     if ((gctx->selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
1313         ret = ret && EC_KEY_generate_key(ec);
1314
1315     if (ret)
1316         return ec;
1317 err:
1318     /* Something went wrong, throw the key away */
1319     EC_KEY_free(ec);
1320     return NULL;
1321 }
1322 # endif
1323 #endif
1324
1325 static void ec_gen_cleanup(void *genctx)
1326 {
1327     struct ec_gen_ctx *gctx = genctx;
1328
1329     if (gctx == NULL)
1330         return;
1331
1332     EC_GROUP_free(gctx->gen_group);
1333     BN_free(gctx->p);
1334     BN_free(gctx->a);
1335     BN_free(gctx->b);
1336     BN_free(gctx->order);
1337     BN_free(gctx->cofactor);
1338     OPENSSL_free(gctx->group_name);
1339     OPENSSL_free(gctx->field_type);
1340     OPENSSL_free(gctx->pt_format);
1341     OPENSSL_free(gctx->encoding);
1342     OPENSSL_free(gctx->seed);
1343     OPENSSL_free(gctx->gen);
1344     OPENSSL_free(gctx);
1345 }
1346
1347 static void *common_load(const void *reference, size_t reference_sz,
1348                          int sm2_wanted)
1349 {
1350     EC_KEY *ec = NULL;
1351
1352     if (ossl_prov_is_running() && reference_sz == sizeof(ec)) {
1353         /* The contents of the reference is the address to our object */
1354         ec = *(EC_KEY **)reference;
1355
1356         if (!common_check_sm2(ec, sm2_wanted))
1357             return NULL;
1358
1359         /* We grabbed, so we detach it */
1360         *(EC_KEY **)reference = NULL;
1361         return ec;
1362     }
1363     return NULL;
1364 }
1365
1366 static void *ec_load(const void *reference, size_t reference_sz)
1367 {
1368     return common_load(reference, reference_sz, 0);
1369 }
1370
1371 #ifndef FIPS_MODULE
1372 # ifndef OPENSSL_NO_SM2
1373 static void *sm2_load(const void *reference, size_t reference_sz)
1374 {
1375     return common_load(reference, reference_sz, 1);
1376 }
1377 # endif
1378 #endif
1379
1380 static void *ec_dup(const void *keydata_from, int selection)
1381 {
1382     if (ossl_prov_is_running())
1383         return ossl_ec_key_dup(keydata_from, selection);
1384     return NULL;
1385 }
1386
1387 const OSSL_DISPATCH ossl_ec_keymgmt_functions[] = {
1388     { OSSL_FUNC_KEYMGMT_NEW, (void (*)(void))ec_newdata },
1389     { OSSL_FUNC_KEYMGMT_GEN_INIT, (void (*)(void))ec_gen_init },
1390     { OSSL_FUNC_KEYMGMT_GEN_SET_TEMPLATE,
1391       (void (*)(void))ec_gen_set_template },
1392     { OSSL_FUNC_KEYMGMT_GEN_SET_PARAMS, (void (*)(void))ec_gen_set_params },
1393     { OSSL_FUNC_KEYMGMT_GEN_SETTABLE_PARAMS,
1394       (void (*)(void))ec_gen_settable_params },
1395     { OSSL_FUNC_KEYMGMT_GEN, (void (*)(void))ec_gen },
1396     { OSSL_FUNC_KEYMGMT_GEN_CLEANUP, (void (*)(void))ec_gen_cleanup },
1397     { OSSL_FUNC_KEYMGMT_LOAD, (void (*)(void))ec_load },
1398     { OSSL_FUNC_KEYMGMT_FREE, (void (*)(void))ec_freedata },
1399     { OSSL_FUNC_KEYMGMT_GET_PARAMS, (void (*) (void))ec_get_params },
1400     { OSSL_FUNC_KEYMGMT_GETTABLE_PARAMS, (void (*) (void))ec_gettable_params },
1401     { OSSL_FUNC_KEYMGMT_SET_PARAMS, (void (*) (void))ec_set_params },
1402     { OSSL_FUNC_KEYMGMT_SETTABLE_PARAMS, (void (*) (void))ec_settable_params },
1403     { OSSL_FUNC_KEYMGMT_HAS, (void (*)(void))ec_has },
1404     { OSSL_FUNC_KEYMGMT_MATCH, (void (*)(void))ec_match },
1405     { OSSL_FUNC_KEYMGMT_VALIDATE, (void (*)(void))ec_validate },
1406     { OSSL_FUNC_KEYMGMT_IMPORT, (void (*)(void))ec_import },
1407     { OSSL_FUNC_KEYMGMT_IMPORT_TYPES, (void (*)(void))ec_import_types },
1408     { OSSL_FUNC_KEYMGMT_EXPORT, (void (*)(void))ec_export },
1409     { OSSL_FUNC_KEYMGMT_EXPORT_TYPES, (void (*)(void))ec_export_types },
1410     { OSSL_FUNC_KEYMGMT_QUERY_OPERATION_NAME,
1411       (void (*)(void))ec_query_operation_name },
1412     { OSSL_FUNC_KEYMGMT_DUP, (void (*)(void))ec_dup },
1413     { 0, NULL }
1414 };
1415
1416 #ifndef FIPS_MODULE
1417 # ifndef OPENSSL_NO_SM2
1418 const OSSL_DISPATCH ossl_sm2_keymgmt_functions[] = {
1419     { OSSL_FUNC_KEYMGMT_NEW, (void (*)(void))sm2_newdata },
1420     { OSSL_FUNC_KEYMGMT_GEN_INIT, (void (*)(void))sm2_gen_init },
1421     { OSSL_FUNC_KEYMGMT_GEN_SET_TEMPLATE,
1422       (void (*)(void))ec_gen_set_template },
1423     { OSSL_FUNC_KEYMGMT_GEN_SET_PARAMS, (void (*)(void))ec_gen_set_params },
1424     { OSSL_FUNC_KEYMGMT_GEN_SETTABLE_PARAMS,
1425       (void (*)(void))ec_gen_settable_params },
1426     { OSSL_FUNC_KEYMGMT_GEN, (void (*)(void))sm2_gen },
1427     { OSSL_FUNC_KEYMGMT_GEN_CLEANUP, (void (*)(void))ec_gen_cleanup },
1428     { OSSL_FUNC_KEYMGMT_LOAD, (void (*)(void))sm2_load },
1429     { OSSL_FUNC_KEYMGMT_FREE, (void (*)(void))ec_freedata },
1430     { OSSL_FUNC_KEYMGMT_GET_PARAMS, (void (*) (void))sm2_get_params },
1431     { OSSL_FUNC_KEYMGMT_GETTABLE_PARAMS, (void (*) (void))sm2_gettable_params },
1432     { OSSL_FUNC_KEYMGMT_SET_PARAMS, (void (*) (void))ec_set_params },
1433     { OSSL_FUNC_KEYMGMT_SETTABLE_PARAMS, (void (*) (void))sm2_settable_params },
1434     { OSSL_FUNC_KEYMGMT_HAS, (void (*)(void))ec_has },
1435     { OSSL_FUNC_KEYMGMT_MATCH, (void (*)(void))ec_match },
1436     { OSSL_FUNC_KEYMGMT_VALIDATE, (void (*)(void))sm2_validate },
1437     { OSSL_FUNC_KEYMGMT_IMPORT, (void (*)(void))sm2_import },
1438     { OSSL_FUNC_KEYMGMT_IMPORT_TYPES, (void (*)(void))ec_import_types },
1439     { OSSL_FUNC_KEYMGMT_EXPORT, (void (*)(void))ec_export },
1440     { OSSL_FUNC_KEYMGMT_EXPORT_TYPES, (void (*)(void))ec_export_types },
1441     { OSSL_FUNC_KEYMGMT_QUERY_OPERATION_NAME,
1442       (void (*)(void))sm2_query_operation_name },
1443     { OSSL_FUNC_KEYMGMT_DUP, (void (*)(void))ec_dup },
1444     { 0, NULL }
1445 };
1446 # endif
1447 #endif