crypto/ec/ec_ameth.c

   1 /*
   2  * Copyright 2006-2021 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 and ECDSA low level APIs are deprecated for public use, but still ok
  12  * for internal use.
  13  */
  14 #include "internal/deprecated.h"
  15
  16 #include <stdio.h>
  17 #include "internal/cryptlib.h"
  18 #include <openssl/x509.h>
  19 #include <openssl/ec.h>
  20 #include <openssl/bn.h>
  21 #include <openssl/asn1t.h>
  22 #include "crypto/asn1.h"
  23 #include "crypto/evp.h"
  24 #include "crypto/x509.h"
  25 #include <openssl/core_names.h>
  26 #include "openssl/param_build.h"
  27 #include "ec_local.h"
  28
  29 static int eckey_param2type(int *pptype, void **ppval, const EC_KEY *ec_key)
  30 {
  31     const EC_GROUP *group;
  32     int nid;
  33
  34     if (ec_key == NULL || (group = EC_KEY_get0_group(ec_key)) == NULL) {
  35         ERR_raise(ERR_LIB_EC, EC_R_MISSING_PARAMETERS);
  36         return 0;
  37     }
  38     if (EC_GROUP_get_asn1_flag(group)
  39         && (nid = EC_GROUP_get_curve_name(group)))
  40         /* we have a 'named curve' => just set the OID */
  41     {
  42         ASN1_OBJECT *asn1obj = OBJ_nid2obj(nid);
  43
  44         if (asn1obj == NULL || OBJ_length(asn1obj) == 0) {
  45             ASN1_OBJECT_free(asn1obj);
  46             ERR_raise(ERR_LIB_EC, EC_R_MISSING_OID);
  47             return 0;
  48         }
  49         *ppval = asn1obj;
  50         *pptype = V_ASN1_OBJECT;
  51     } else {                    /* explicit parameters */
  52
  53         ASN1_STRING *pstr = NULL;
  54         pstr = ASN1_STRING_new();
  55         if (pstr == NULL)
  56             return 0;
  57         pstr->length = i2d_ECParameters(ec_key, &pstr->data);
  58         if (pstr->length <= 0) {
  59             ASN1_STRING_free(pstr);
  60             ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
  61             return 0;
  62         }
  63         *ppval = pstr;
  64         *pptype = V_ASN1_SEQUENCE;
  65     }
  66     return 1;
  67 }
  68
  69 static int eckey_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
  70 {
  71     const EC_KEY *ec_key = pkey->pkey.ec;
  72     void *pval = NULL;
  73     int ptype;
  74     unsigned char *penc = NULL, *p;
  75     int penclen;
  76
  77     if (!eckey_param2type(&ptype, &pval, ec_key)) {
  78         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
  79         return 0;
  80     }
  81     penclen = i2o_ECPublicKey(ec_key, NULL);
  82     if (penclen <= 0)
  83         goto err;
  84     penc = OPENSSL_malloc(penclen);
  85     if (penc == NULL)
  86         goto err;
  87     p = penc;
  88     penclen = i2o_ECPublicKey(ec_key, &p);
  89     if (penclen <= 0)
  90         goto err;
  91     if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_EC),
  92                                ptype, pval, penc, penclen))
  93         return 1;
  94  err:
  95     if (ptype == V_ASN1_OBJECT)
  96         ASN1_OBJECT_free(pval);
  97     else
  98         ASN1_STRING_free(pval);
  99     OPENSSL_free(penc);
 100     return 0;
 101 }
 102
 103 static int eckey_pub_decode(EVP_PKEY *pkey, const X509_PUBKEY *pubkey)
 104 {
 105     const unsigned char *p = NULL;
 106     int pklen;
 107     EC_KEY *eckey = NULL;
 108     X509_ALGOR *palg;
 109     OSSL_LIB_CTX *libctx = NULL;
 110     const char *propq = NULL;
 111
 112     if (!ossl_x509_PUBKEY_get0_libctx(&libctx, &propq, pubkey)
 113         || !X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
 114         return 0;
 115     eckey = ossl_ec_key_param_from_x509_algor(palg, libctx, propq);
 116
 117     if (!eckey)
 118         return 0;
 119
 120     /* We have parameters now set public key */
 121     if (!o2i_ECPublicKey(&eckey, &p, pklen)) {
 122         ERR_raise(ERR_LIB_EC, EC_R_DECODE_ERROR);
 123         goto ecerr;
 124     }
 125
 126     EVP_PKEY_assign_EC_KEY(pkey, eckey);
 127     return 1;
 128
 129  ecerr:
 130     EC_KEY_free(eckey);
 131     return 0;
 132 }
 133
 134 static int eckey_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
 135 {
 136     int r;
 137     const EC_GROUP *group = EC_KEY_get0_group(b->pkey.ec);
 138     const EC_POINT *pa = EC_KEY_get0_public_key(a->pkey.ec),
 139         *pb = EC_KEY_get0_public_key(b->pkey.ec);
 140
 141     if (group == NULL || pa == NULL || pb == NULL)
 142         return -2;
 143     r = EC_POINT_cmp(group, pa, pb, NULL);
 144     if (r == 0)
 145         return 1;
 146     if (r == 1)
 147         return 0;
 148     return -2;
 149 }
 150
 151 static int eckey_priv_decode_ex(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8,
 152                                 OSSL_LIB_CTX *libctx, const char *propq)
 153 {
 154     int ret = 0;
 155     EC_KEY *eckey = ossl_ec_key_from_pkcs8(p8, libctx, propq);
 156
 157     if (eckey != NULL) {
 158         ret = 1;
 159         EVP_PKEY_assign_EC_KEY(pkey, eckey);
 160     }
 161
 162     return ret;
 163 }
 164
 165 static int eckey_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
 166 {
 167     EC_KEY ec_key = *(pkey->pkey.ec);
 168     unsigned char *ep, *p;
 169     int eplen, ptype;
 170     void *pval;
 171     unsigned int old_flags;
 172
 173     if (!eckey_param2type(&ptype, &pval, &ec_key)) {
 174         ERR_raise(ERR_LIB_EC, EC_R_DECODE_ERROR);
 175         return 0;
 176     }
 177
 178     /* set the private key */
 179
 180     /*
 181      * do not include the parameters in the SEC1 private key see PKCS#11
 182      * 12.11
 183      */
 184     old_flags = EC_KEY_get_enc_flags(&ec_key);
 185     EC_KEY_set_enc_flags(&ec_key, old_flags | EC_PKEY_NO_PARAMETERS);
 186
 187     eplen = i2d_ECPrivateKey(&ec_key, NULL);
 188     if (!eplen) {
 189         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 190         return 0;
 191     }
 192     ep = OPENSSL_malloc(eplen);
 193     if (ep == NULL) {
 194         ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
 195         return 0;
 196     }
 197     p = ep;
 198     if (!i2d_ECPrivateKey(&ec_key, &p)) {
 199         OPENSSL_free(ep);
 200         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 201         return 0;
 202     }
 203
 204     if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_X9_62_id_ecPublicKey), 0,
 205                          ptype, pval, ep, eplen)) {
 206         OPENSSL_free(ep);
 207         return 0;
 208     }
 209
 210     return 1;
 211 }
 212
 213 static int int_ec_size(const EVP_PKEY *pkey)
 214 {
 215     return ECDSA_size(pkey->pkey.ec);
 216 }
 217
 218 static int ec_bits(const EVP_PKEY *pkey)
 219 {
 220     return EC_GROUP_order_bits(EC_KEY_get0_group(pkey->pkey.ec));
 221 }
 222
 223 static int ec_security_bits(const EVP_PKEY *pkey)
 224 {
 225     int ecbits = ec_bits(pkey);
 226
 227     if (ecbits >= 512)
 228         return 256;
 229     if (ecbits >= 384)
 230         return 192;
 231     if (ecbits >= 256)
 232         return 128;
 233     if (ecbits >= 224)
 234         return 112;
 235     if (ecbits >= 160)
 236         return 80;
 237     return ecbits / 2;
 238 }
 239
 240 static int ec_missing_parameters(const EVP_PKEY *pkey)
 241 {
 242     if (pkey->pkey.ec == NULL || EC_KEY_get0_group(pkey->pkey.ec) == NULL)
 243         return 1;
 244     return 0;
 245 }
 246
 247 static int ec_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
 248 {
 249     EC_GROUP *group = EC_GROUP_dup(EC_KEY_get0_group(from->pkey.ec));
 250
 251     if (group == NULL)
 252         return 0;
 253     if (to->pkey.ec == NULL) {
 254         to->pkey.ec = EC_KEY_new();
 255         if (to->pkey.ec == NULL)
 256             goto err;
 257     }
 258     if (EC_KEY_set_group(to->pkey.ec, group) == 0)
 259         goto err;
 260     EC_GROUP_free(group);
 261     return 1;
 262  err:
 263     EC_GROUP_free(group);
 264     return 0;
 265 }
 266
 267 static int ec_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
 268 {
 269     const EC_GROUP *group_a = EC_KEY_get0_group(a->pkey.ec),
 270         *group_b = EC_KEY_get0_group(b->pkey.ec);
 271
 272     if (group_a == NULL || group_b == NULL)
 273         return -2;
 274     if (EC_GROUP_cmp(group_a, group_b, NULL))
 275         return 0;
 276     else
 277         return 1;
 278 }
 279
 280 static void int_ec_free(EVP_PKEY *pkey)
 281 {
 282     EC_KEY_free(pkey->pkey.ec);
 283 }
 284
 285 typedef enum {
 286     EC_KEY_PRINT_PRIVATE,
 287     EC_KEY_PRINT_PUBLIC,
 288     EC_KEY_PRINT_PARAM
 289 } ec_print_t;
 290
 291 static int do_EC_KEY_print(BIO *bp, const EC_KEY *x, int off, ec_print_t ktype)
 292 {
 293     const char *ecstr;
 294     unsigned char *priv = NULL, *pub = NULL;
 295     size_t privlen = 0, publen = 0;
 296     int ret = 0;
 297     const EC_GROUP *group;
 298
 299     if (x == NULL || (group = EC_KEY_get0_group(x)) == NULL) {
 300         ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
 301         return 0;
 302     }
 303
 304     if (ktype != EC_KEY_PRINT_PARAM && EC_KEY_get0_public_key(x) != NULL) {
 305         publen = EC_KEY_key2buf(x, EC_KEY_get_conv_form(x), &pub, NULL);
 306         if (publen == 0)
 307             goto err;
 308     }
 309
 310     if (ktype == EC_KEY_PRINT_PRIVATE && EC_KEY_get0_private_key(x) != NULL) {
 311         privlen = EC_KEY_priv2buf(x, &priv);
 312         if (privlen == 0)
 313             goto err;
 314     }
 315
 316     if (ktype == EC_KEY_PRINT_PRIVATE)
 317         ecstr = "Private-Key";
 318     else if (ktype == EC_KEY_PRINT_PUBLIC)
 319         ecstr = "Public-Key";
 320     else
 321         ecstr = "ECDSA-Parameters";
 322
 323     if (!BIO_indent(bp, off, 128))
 324         goto err;
 325     if (BIO_printf(bp, "%s: (%d bit)\n", ecstr,
 326                    EC_GROUP_order_bits(group)) <= 0)
 327         goto err;
 328
 329     if (privlen != 0) {
 330         if (BIO_printf(bp, "%*spriv:\n", off, "") <= 0)
 331             goto err;
 332         if (ASN1_buf_print(bp, priv, privlen, off + 4) == 0)
 333             goto err;
 334     }
 335
 336     if (publen != 0) {
 337         if (BIO_printf(bp, "%*spub:\n", off, "") <= 0)
 338             goto err;
 339         if (ASN1_buf_print(bp, pub, publen, off + 4) == 0)
 340             goto err;
 341     }
 342
 343     if (!ECPKParameters_print(bp, group, off))
 344         goto err;
 345     ret = 1;
 346  err:
 347     if (!ret)
 348         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 349     OPENSSL_clear_free(priv, privlen);
 350     OPENSSL_free(pub);
 351     return ret;
 352 }
 353
 354 static int eckey_param_decode(EVP_PKEY *pkey,
 355                               const unsigned char **pder, int derlen)
 356 {
 357     EC_KEY *eckey;
 358
 359     if ((eckey = d2i_ECParameters(NULL, pder, derlen)) == NULL)
 360         return 0;
 361     EVP_PKEY_assign_EC_KEY(pkey, eckey);
 362     return 1;
 363 }
 364
 365 static int eckey_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
 366 {
 367     return i2d_ECParameters(pkey->pkey.ec, pder);
 368 }
 369
 370 static int eckey_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 371                              ASN1_PCTX *ctx)
 372 {
 373     return do_EC_KEY_print(bp, pkey->pkey.ec, indent, EC_KEY_PRINT_PARAM);
 374 }
 375
 376 static int eckey_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 377                            ASN1_PCTX *ctx)
 378 {
 379     return do_EC_KEY_print(bp, pkey->pkey.ec, indent, EC_KEY_PRINT_PUBLIC);
 380 }
 381
 382 static int eckey_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 383                             ASN1_PCTX *ctx)
 384 {
 385     return do_EC_KEY_print(bp, pkey->pkey.ec, indent, EC_KEY_PRINT_PRIVATE);
 386 }
 387
 388 static int old_ec_priv_decode(EVP_PKEY *pkey,
 389                               const unsigned char **pder, int derlen)
 390 {
 391     EC_KEY *ec;
 392
 393     if ((ec = d2i_ECPrivateKey(NULL, pder, derlen)) == NULL)
 394         return 0;
 395     EVP_PKEY_assign_EC_KEY(pkey, ec);
 396     return 1;
 397 }
 398
 399 static int old_ec_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
 400 {
 401     return i2d_ECPrivateKey(pkey->pkey.ec, pder);
 402 }
 403
 404 static int ec_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
 405 {
 406     switch (op) {
 407     case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
 408         if (EVP_PKEY_id(pkey) == EVP_PKEY_SM2) {
 409             /* For SM2, the only valid digest-alg is SM3 */
 410             *(int *)arg2 = NID_sm3;
 411             return 2;            /* Make it mandatory */
 412         }
 413         *(int *)arg2 = NID_sha256;
 414         return 1;
 415
 416     case ASN1_PKEY_CTRL_SET1_TLS_ENCPT:
 417         /* We should only be here if we have a legacy key */
 418         if (!ossl_assert(evp_pkey_is_legacy(pkey)))
 419             return 0;
 420         return EC_KEY_oct2key(evp_pkey_get0_EC_KEY_int(pkey), arg2, arg1, NULL);
 421
 422     case ASN1_PKEY_CTRL_GET1_TLS_ENCPT:
 423         return EC_KEY_key2buf(EVP_PKEY_get0_EC_KEY(pkey),
 424                               POINT_CONVERSION_UNCOMPRESSED, arg2, NULL);
 425
 426     default:
 427         return -2;
 428     }
 429 }
 430
 431 static int ec_pkey_check(const EVP_PKEY *pkey)
 432 {
 433     EC_KEY *eckey = pkey->pkey.ec;
 434
 435     /* stay consistent to what EVP_PKEY_check demands */
 436     if (eckey->priv_key == NULL) {
 437         ERR_raise(ERR_LIB_EC, EC_R_MISSING_PRIVATE_KEY);
 438         return 0;
 439     }
 440
 441     return EC_KEY_check_key(eckey);
 442 }
 443
 444 static int ec_pkey_public_check(const EVP_PKEY *pkey)
 445 {
 446     EC_KEY *eckey = pkey->pkey.ec;
 447
 448     /*
 449      * Note: it unnecessary to check eckey->pub_key here since
 450      * it will be checked in EC_KEY_check_key(). In fact, the
 451      * EC_KEY_check_key() mainly checks the public key, and checks
 452      * the private key optionally (only if there is one). So if
 453      * someone passes a whole EC key (public + private), this
 454      * will also work...
 455      */
 456
 457     return EC_KEY_check_key(eckey);
 458 }
 459
 460 static int ec_pkey_param_check(const EVP_PKEY *pkey)
 461 {
 462     EC_KEY *eckey = pkey->pkey.ec;
 463
 464     /* stay consistent to what EVP_PKEY_check demands */
 465     if (eckey->group == NULL) {
 466         ERR_raise(ERR_LIB_EC, EC_R_MISSING_PARAMETERS);
 467         return 0;
 468     }
 469
 470     return EC_GROUP_check(eckey->group, NULL);
 471 }
 472
 473 static
 474 size_t ec_pkey_dirty_cnt(const EVP_PKEY *pkey)
 475 {
 476     return pkey->pkey.ec->dirty_cnt;
 477 }
 478
 479 static
 480 int ec_pkey_export_to(const EVP_PKEY *from, void *to_keydata,
 481                       EVP_KEYMGMT *to_keymgmt, OSSL_LIB_CTX *libctx,
 482                       const char *propq)
 483 {
 484     const EC_KEY *eckey = NULL;
 485     const EC_GROUP *ecg = NULL;
 486     unsigned char *pub_key_buf = NULL, *gen_buf = NULL;
 487     size_t pub_key_buflen;
 488     OSSL_PARAM_BLD *tmpl;
 489     OSSL_PARAM *params = NULL;
 490     const BIGNUM *priv_key = NULL;
 491     const EC_POINT *pub_point = NULL;
 492     int selection = 0;
 493     int rv = 0;
 494     BN_CTX *bnctx = NULL;
 495
 496     if (from == NULL
 497             || (eckey = from->pkey.ec) == NULL
 498             || (ecg = EC_KEY_get0_group(eckey)) == NULL)
 499         return 0;
 500
 501     /*
 502      * If the EC_KEY method is foreign, then we can't be sure of anything,
 503      * and can therefore not export or pretend to export.
 504      */
 505     if (EC_KEY_get_method(eckey) != EC_KEY_OpenSSL())
 506         return 0;
 507
 508     tmpl = OSSL_PARAM_BLD_new();
 509     if (tmpl == NULL)
 510         return 0;
 511
 512     /*
 513      * EC_POINT_point2buf() can generate random numbers in some
 514      * implementations so we need to ensure we use the correct libctx.
 515      */
 516     bnctx = BN_CTX_new_ex(libctx);
 517     if (bnctx == NULL)
 518         goto err;
 519     BN_CTX_start(bnctx);
 520
 521     /* export the domain parameters */
 522     if (!ossl_ec_group_todata(ecg, tmpl, NULL, libctx, propq, bnctx, &gen_buf))
 523         goto err;
 524     selection |= OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS;
 525
 526     priv_key = EC_KEY_get0_private_key(eckey);
 527     pub_point = EC_KEY_get0_public_key(eckey);
 528
 529     if (pub_point != NULL) {
 530         /* convert pub_point to a octet string according to the SECG standard */
 531         if ((pub_key_buflen = EC_POINT_point2buf(ecg, pub_point,
 532                                                  POINT_CONVERSION_COMPRESSED,
 533                                                  &pub_key_buf, bnctx)) == 0
 534             || !OSSL_PARAM_BLD_push_octet_string(tmpl,
 535                                                  OSSL_PKEY_PARAM_PUB_KEY,
 536                                                  pub_key_buf,
 537                                                  pub_key_buflen))
 538             goto err;
 539         selection |= OSSL_KEYMGMT_SELECT_PUBLIC_KEY;
 540     }
 541
 542     if (priv_key != NULL) {
 543         size_t sz;
 544         int ecbits;
 545         int ecdh_cofactor_mode;
 546
 547         /*
 548          * Key import/export should never leak the bit length of the secret
 549          * scalar in the key.
 550          *
 551          * For this reason, on export we use padded BIGNUMs with fixed length.
 552          *
 553          * When importing we also should make sure that, even if short lived,
 554          * the newly created BIGNUM is marked with the BN_FLG_CONSTTIME flag as
 555          * soon as possible, so that any processing of this BIGNUM might opt for
 556          * constant time implementations in the backend.
 557          *
 558          * Setting the BN_FLG_CONSTTIME flag alone is never enough, we also have
 559          * to preallocate the BIGNUM internal buffer to a fixed public size big
 560          * enough that operations performed during the processing never trigger
 561          * a realloc which would leak the size of the scalar through memory
 562          * accesses.
 563          *
 564          * Fixed Length
 565          * ------------
 566          *
 567          * The order of the large prime subgroup of the curve is our choice for
 568          * a fixed public size, as that is generally the upper bound for
 569          * generating a private key in EC cryptosystems and should fit all valid
 570          * secret scalars.
 571          *
 572          * For padding on export we just use the bit length of the order
 573          * converted to bytes (rounding up).
 574          *
 575          * For preallocating the BIGNUM storage we look at the number of "words"
 576          * required for the internal representation of the order, and we
 577          * preallocate 2 extra "words" in case any of the subsequent processing
 578          * might temporarily overflow the order length.
 579          */
 580         ecbits = EC_GROUP_order_bits(ecg);
 581         if (ecbits <= 0)
 582             goto err;
 583
 584         sz = (ecbits + 7 ) / 8;
 585         if (!OSSL_PARAM_BLD_push_BN_pad(tmpl,
 586                                         OSSL_PKEY_PARAM_PRIV_KEY,
 587                                         priv_key, sz))
 588             goto err;
 589         selection |= OSSL_KEYMGMT_SELECT_PRIVATE_KEY;
 590
 591         /*
 592          * The ECDH Cofactor Mode is defined only if the EC_KEY actually
 593          * contains a private key, so we check for the flag and export it only
 594          * in this case.
 595          */
 596         ecdh_cofactor_mode =
 597             (EC_KEY_get_flags(eckey) & EC_FLAG_COFACTOR_ECDH) ? 1 : 0;
 598
 599         /* Export the ECDH_COFACTOR_MODE parameter */
 600         if (!OSSL_PARAM_BLD_push_int(tmpl,
 601                                      OSSL_PKEY_PARAM_USE_COFACTOR_ECDH,
 602                                      ecdh_cofactor_mode))
 603             goto err;
 604         selection |= OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS;
 605     }
 606
 607     params = OSSL_PARAM_BLD_to_param(tmpl);
 608
 609     /* We export, the provider imports */
 610     rv = evp_keymgmt_import(to_keymgmt, to_keydata, selection, params);
 611
 612  err:
 613     OSSL_PARAM_BLD_free(tmpl);
 614     OSSL_PARAM_BLD_free_params(params);
 615     OPENSSL_free(pub_key_buf);
 616     OPENSSL_free(gen_buf);
 617     BN_CTX_end(bnctx);
 618     BN_CTX_free(bnctx);
 619     return rv;
 620 }
 621
 622 static int ec_pkey_import_from(const OSSL_PARAM params[], void *vpctx)
 623 {
 624     EVP_PKEY_CTX *pctx = vpctx;
 625     EVP_PKEY *pkey = EVP_PKEY_CTX_get0_pkey(pctx);
 626     EC_KEY *ec = EC_KEY_new_ex(pctx->libctx, pctx->propquery);
 627
 628     if (ec == NULL) {
 629         ERR_raise(ERR_LIB_DH, ERR_R_MALLOC_FAILURE);
 630         return 0;
 631     }
 632
 633     if (!ossl_ec_group_fromdata(ec, params)
 634         || !ossl_ec_key_otherparams_fromdata(ec, params)
 635         || !ossl_ec_key_fromdata(ec, params, 1)
 636         || !EVP_PKEY_assign_EC_KEY(pkey, ec)) {
 637         EC_KEY_free(ec);
 638         return 0;
 639     }
 640     return 1;
 641 }
 642
 643 static int ec_pkey_copy(EVP_PKEY *to, EVP_PKEY *from)
 644 {
 645     EC_KEY *eckey = from->pkey.ec;
 646     EC_KEY *dupkey = NULL;
 647     int ret;
 648
 649     if (eckey != NULL) {
 650         dupkey = EC_KEY_dup(eckey);
 651         if (dupkey == NULL)
 652             return 0;
 653     } else {
 654         /* necessary to properly copy empty SM2 keys */
 655         return EVP_PKEY_set_type(to, from->type);
 656     }
 657
 658     ret = EVP_PKEY_assign_EC_KEY(to, dupkey);
 659     if (!ret)
 660         EC_KEY_free(dupkey);
 661     return ret;
 662 }
 663
 664 const EVP_PKEY_ASN1_METHOD ossl_eckey_asn1_meth = {
 665     EVP_PKEY_EC,
 666     EVP_PKEY_EC,
 667     0,
 668     "EC",
 669     "OpenSSL EC algorithm",
 670
 671     eckey_pub_decode,
 672     eckey_pub_encode,
 673     eckey_pub_cmp,
 674     eckey_pub_print,
 675
 676     NULL,
 677     eckey_priv_encode,
 678     eckey_priv_print,
 679
 680     int_ec_size,
 681     ec_bits,
 682     ec_security_bits,
 683
 684     eckey_param_decode,
 685     eckey_param_encode,
 686     ec_missing_parameters,
 687     ec_copy_parameters,
 688     ec_cmp_parameters,
 689     eckey_param_print,
 690     0,
 691
 692     int_ec_free,
 693     ec_pkey_ctrl,
 694     old_ec_priv_decode,
 695     old_ec_priv_encode,
 696
 697     0, 0, 0,
 698
 699     ec_pkey_check,
 700     ec_pkey_public_check,
 701     ec_pkey_param_check,
 702
 703     0, /* set_priv_key */
 704     0, /* set_pub_key */
 705     0, /* get_priv_key */
 706     0, /* get_pub_key */
 707
 708     ec_pkey_dirty_cnt,
 709     ec_pkey_export_to,
 710     ec_pkey_import_from,
 711     ec_pkey_copy,
 712     eckey_priv_decode_ex
 713 };
 714
 715 #if !defined(OPENSSL_NO_SM2)
 716 const EVP_PKEY_ASN1_METHOD ossl_sm2_asn1_meth = {
 717    EVP_PKEY_SM2,
 718    EVP_PKEY_EC,
 719    ASN1_PKEY_ALIAS
 720 };
 721 #endif
 722
 723 int EC_KEY_print(BIO *bp, const EC_KEY *x, int off)
 724 {
 725     int private = EC_KEY_get0_private_key(x) != NULL;
 726
 727     return do_EC_KEY_print(bp, x, off,
 728                 private ? EC_KEY_PRINT_PRIVATE : EC_KEY_PRINT_PUBLIC);
 729 }
 730
 731 int ECParameters_print(BIO *bp, const EC_KEY *x)
 732 {
 733     return do_EC_KEY_print(bp, x, 4, EC_KEY_PRINT_PARAM);
 734 }