crypto/ec/ec_asn1.c

   1 /*
   2  * Copyright 2002-2018 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 #include <string.h>
  11 #include "ec_local.h"
  12 #include <openssl/err.h>
  13 #include <openssl/asn1t.h>
  14 #include <openssl/objects.h>
  15 #include "internal/nelem.h"
  16 #include "crypto/asn1_dsa.h"
  17
  18 #ifndef FIPS_MODE
  19
  20 int EC_GROUP_get_basis_type(const EC_GROUP *group)
  21 {
  22     int i;
  23
  24     if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
  25         NID_X9_62_characteristic_two_field)
  26         /* everything else is currently not supported */
  27         return 0;
  28
  29     /* Find the last non-zero element of group->poly[] */
  30     for (i = 0;
  31          i < (int)OSSL_NELEM(group->poly) && group->poly[i] != 0;
  32          i++)
  33         continue;
  34
  35     if (i == 4)
  36         return NID_X9_62_ppBasis;
  37     else if (i == 2)
  38         return NID_X9_62_tpBasis;
  39     else
  40         /* everything else is currently not supported */
  41         return 0;
  42 }
  43
  44 #ifndef OPENSSL_NO_EC2M
  45 int EC_GROUP_get_trinomial_basis(const EC_GROUP *group, unsigned int *k)
  46 {
  47     if (group == NULL)
  48         return 0;
  49
  50     if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
  51         NID_X9_62_characteristic_two_field
  52         || !((group->poly[0] != 0) && (group->poly[1] != 0)
  53              && (group->poly[2] == 0))) {
  54         ECerr(EC_F_EC_GROUP_GET_TRINOMIAL_BASIS,
  55               ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
  56         return 0;
  57     }
  58
  59     if (k)
  60         *k = group->poly[1];
  61
  62     return 1;
  63 }
  64
  65 int EC_GROUP_get_pentanomial_basis(const EC_GROUP *group, unsigned int *k1,
  66                                    unsigned int *k2, unsigned int *k3)
  67 {
  68     if (group == NULL)
  69         return 0;
  70
  71     if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
  72         NID_X9_62_characteristic_two_field
  73         || !((group->poly[0] != 0) && (group->poly[1] != 0)
  74              && (group->poly[2] != 0) && (group->poly[3] != 0)
  75              && (group->poly[4] == 0))) {
  76         ECerr(EC_F_EC_GROUP_GET_PENTANOMIAL_BASIS,
  77               ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
  78         return 0;
  79     }
  80
  81     if (k1)
  82         *k1 = group->poly[3];
  83     if (k2)
  84         *k2 = group->poly[2];
  85     if (k3)
  86         *k3 = group->poly[1];
  87
  88     return 1;
  89 }
  90 #endif
  91
  92 /* some structures needed for the asn1 encoding */
  93 typedef struct x9_62_pentanomial_st {
  94     int32_t k1;
  95     int32_t k2;
  96     int32_t k3;
  97 } X9_62_PENTANOMIAL;
  98
  99 typedef struct x9_62_characteristic_two_st {
 100     int32_t m;
 101     ASN1_OBJECT *type;
 102     union {
 103         char *ptr;
 104         /* NID_X9_62_onBasis */
 105         ASN1_NULL *onBasis;
 106         /* NID_X9_62_tpBasis */
 107         ASN1_INTEGER *tpBasis;
 108         /* NID_X9_62_ppBasis */
 109         X9_62_PENTANOMIAL *ppBasis;
 110         /* anything else */
 111         ASN1_TYPE *other;
 112     } p;
 113 } X9_62_CHARACTERISTIC_TWO;
 114
 115 typedef struct x9_62_fieldid_st {
 116     ASN1_OBJECT *fieldType;
 117     union {
 118         char *ptr;
 119         /* NID_X9_62_prime_field */
 120         ASN1_INTEGER *prime;
 121         /* NID_X9_62_characteristic_two_field */
 122         X9_62_CHARACTERISTIC_TWO *char_two;
 123         /* anything else */
 124         ASN1_TYPE *other;
 125     } p;
 126 } X9_62_FIELDID;
 127
 128 typedef struct x9_62_curve_st {
 129     ASN1_OCTET_STRING *a;
 130     ASN1_OCTET_STRING *b;
 131     ASN1_BIT_STRING *seed;
 132 } X9_62_CURVE;
 133
 134 struct ec_parameters_st {
 135     int32_t version;
 136     X9_62_FIELDID *fieldID;
 137     X9_62_CURVE *curve;
 138     ASN1_OCTET_STRING *base;
 139     ASN1_INTEGER *order;
 140     ASN1_INTEGER *cofactor;
 141 } /* ECPARAMETERS */ ;
 142
 143 struct ecpk_parameters_st {
 144     int type;
 145     union {
 146         ASN1_OBJECT *named_curve;
 147         ECPARAMETERS *parameters;
 148         ASN1_NULL *implicitlyCA;
 149     } value;
 150 } /* ECPKPARAMETERS */ ;
 151
 152 /* SEC1 ECPrivateKey */
 153 typedef struct ec_privatekey_st {
 154     int32_t version;
 155     ASN1_OCTET_STRING *privateKey;
 156     ECPKPARAMETERS *parameters;
 157     ASN1_BIT_STRING *publicKey;
 158 } EC_PRIVATEKEY;
 159
 160 /* the OpenSSL ASN.1 definitions */
 161 ASN1_SEQUENCE(X9_62_PENTANOMIAL) = {
 162         ASN1_EMBED(X9_62_PENTANOMIAL, k1, INT32),
 163         ASN1_EMBED(X9_62_PENTANOMIAL, k2, INT32),
 164         ASN1_EMBED(X9_62_PENTANOMIAL, k3, INT32)
 165 } static_ASN1_SEQUENCE_END(X9_62_PENTANOMIAL)
 166
 167 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
 168 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
 169
 170 ASN1_ADB_TEMPLATE(char_two_def) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.other, ASN1_ANY);
 171
 172 ASN1_ADB(X9_62_CHARACTERISTIC_TWO) = {
 173         ADB_ENTRY(NID_X9_62_onBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.onBasis, ASN1_NULL)),
 174         ADB_ENTRY(NID_X9_62_tpBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.tpBasis, ASN1_INTEGER)),
 175         ADB_ENTRY(NID_X9_62_ppBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.ppBasis, X9_62_PENTANOMIAL))
 176 } ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO, 0, type, 0, &char_two_def_tt, NULL);
 177
 178 ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO) = {
 179         ASN1_EMBED(X9_62_CHARACTERISTIC_TWO, m, INT32),
 180         ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, type, ASN1_OBJECT),
 181         ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO)
 182 } static_ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO)
 183
 184 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
 185 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
 186
 187 ASN1_ADB_TEMPLATE(fieldID_def) = ASN1_SIMPLE(X9_62_FIELDID, p.other, ASN1_ANY);
 188
 189 ASN1_ADB(X9_62_FIELDID) = {
 190         ADB_ENTRY(NID_X9_62_prime_field, ASN1_SIMPLE(X9_62_FIELDID, p.prime, ASN1_INTEGER)),
 191         ADB_ENTRY(NID_X9_62_characteristic_two_field, ASN1_SIMPLE(X9_62_FIELDID, p.char_two, X9_62_CHARACTERISTIC_TWO))
 192 } ASN1_ADB_END(X9_62_FIELDID, 0, fieldType, 0, &fieldID_def_tt, NULL);
 193
 194 ASN1_SEQUENCE(X9_62_FIELDID) = {
 195         ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT),
 196         ASN1_ADB_OBJECT(X9_62_FIELDID)
 197 } static_ASN1_SEQUENCE_END(X9_62_FIELDID)
 198
 199 ASN1_SEQUENCE(X9_62_CURVE) = {
 200         ASN1_SIMPLE(X9_62_CURVE, a, ASN1_OCTET_STRING),
 201         ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING),
 202         ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING)
 203 } static_ASN1_SEQUENCE_END(X9_62_CURVE)
 204
 205 ASN1_SEQUENCE(ECPARAMETERS) = {
 206         ASN1_EMBED(ECPARAMETERS, version, INT32),
 207         ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID),
 208         ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE),
 209         ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING),
 210         ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER),
 211         ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER)
 212 } ASN1_SEQUENCE_END(ECPARAMETERS)
 213
 214 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
 215 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
 216
 217 ASN1_CHOICE(ECPKPARAMETERS) = {
 218         ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT),
 219         ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS),
 220         ASN1_SIMPLE(ECPKPARAMETERS, value.implicitlyCA, ASN1_NULL)
 221 } ASN1_CHOICE_END(ECPKPARAMETERS)
 222
 223 DECLARE_ASN1_FUNCTIONS(ECPKPARAMETERS)
 224 DECLARE_ASN1_ENCODE_FUNCTIONS_name(ECPKPARAMETERS, ECPKPARAMETERS)
 225 IMPLEMENT_ASN1_FUNCTIONS(ECPKPARAMETERS)
 226
 227 ASN1_SEQUENCE(EC_PRIVATEKEY) = {
 228         ASN1_EMBED(EC_PRIVATEKEY, version, INT32),
 229         ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING),
 230         ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0),
 231         ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1)
 232 } static_ASN1_SEQUENCE_END(EC_PRIVATEKEY)
 233
 234 DECLARE_ASN1_FUNCTIONS(EC_PRIVATEKEY)
 235 DECLARE_ASN1_ENCODE_FUNCTIONS_name(EC_PRIVATEKEY, EC_PRIVATEKEY)
 236 IMPLEMENT_ASN1_FUNCTIONS(EC_PRIVATEKEY)
 237
 238 /* some declarations of internal function */
 239
 240 /* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */
 241 static int ec_asn1_group2fieldid(const EC_GROUP *, X9_62_FIELDID *);
 242 /* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */
 243 static int ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *);
 244
 245 /* the function definitions */
 246
 247 static int ec_asn1_group2fieldid(const EC_GROUP *group, X9_62_FIELDID *field)
 248 {
 249     int ok = 0, nid;
 250     BIGNUM *tmp = NULL;
 251
 252     if (group == NULL || field == NULL)
 253         return 0;
 254
 255     /* clear the old values (if necessary) */
 256     ASN1_OBJECT_free(field->fieldType);
 257     ASN1_TYPE_free(field->p.other);
 258
 259     nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
 260     /* set OID for the field */
 261     if ((field->fieldType = OBJ_nid2obj(nid)) == NULL) {
 262         ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
 263         goto err;
 264     }
 265
 266     if (nid == NID_X9_62_prime_field) {
 267         if ((tmp = BN_new()) == NULL) {
 268             ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
 269             goto err;
 270         }
 271         /* the parameters are specified by the prime number p */
 272         if (!EC_GROUP_get_curve(group, tmp, NULL, NULL, NULL)) {
 273             ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
 274             goto err;
 275         }
 276         /* set the prime number */
 277         field->p.prime = BN_to_ASN1_INTEGER(tmp, NULL);
 278         if (field->p.prime == NULL) {
 279             ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
 280             goto err;
 281         }
 282     } else if (nid == NID_X9_62_characteristic_two_field)
 283 #ifdef OPENSSL_NO_EC2M
 284     {
 285         ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_GF2M_NOT_SUPPORTED);
 286         goto err;
 287     }
 288 #else
 289     {
 290         int field_type;
 291         X9_62_CHARACTERISTIC_TWO *char_two;
 292
 293         field->p.char_two = X9_62_CHARACTERISTIC_TWO_new();
 294         char_two = field->p.char_two;
 295
 296         if (char_two == NULL) {
 297             ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
 298             goto err;
 299         }
 300
 301         char_two->m = (long)EC_GROUP_get_degree(group);
 302
 303         field_type = EC_GROUP_get_basis_type(group);
 304
 305         if (field_type == 0) {
 306             ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
 307             goto err;
 308         }
 309         /* set base type OID */
 310         if ((char_two->type = OBJ_nid2obj(field_type)) == NULL) {
 311             ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
 312             goto err;
 313         }
 314
 315         if (field_type == NID_X9_62_tpBasis) {
 316             unsigned int k;
 317
 318             if (!EC_GROUP_get_trinomial_basis(group, &k))
 319                 goto err;
 320
 321             char_two->p.tpBasis = ASN1_INTEGER_new();
 322             if (char_two->p.tpBasis == NULL) {
 323                 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
 324                 goto err;
 325             }
 326             if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k)) {
 327                 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
 328                 goto err;
 329             }
 330         } else if (field_type == NID_X9_62_ppBasis) {
 331             unsigned int k1, k2, k3;
 332
 333             if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3))
 334                 goto err;
 335
 336             char_two->p.ppBasis = X9_62_PENTANOMIAL_new();
 337             if (char_two->p.ppBasis == NULL) {
 338                 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
 339                 goto err;
 340             }
 341
 342             /* set k? values */
 343             char_two->p.ppBasis->k1 = (long)k1;
 344             char_two->p.ppBasis->k2 = (long)k2;
 345             char_two->p.ppBasis->k3 = (long)k3;
 346         } else {                /* field_type == NID_X9_62_onBasis */
 347
 348             /* for ONB the parameters are (asn1) NULL */
 349             char_two->p.onBasis = ASN1_NULL_new();
 350             if (char_two->p.onBasis == NULL) {
 351                 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
 352                 goto err;
 353             }
 354         }
 355     }
 356 #endif
 357     else {
 358         ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_UNSUPPORTED_FIELD);
 359         goto err;
 360     }
 361
 362     ok = 1;
 363
 364  err:
 365     BN_free(tmp);
 366     return ok;
 367 }
 368
 369 static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
 370 {
 371     int ok = 0;
 372     BIGNUM *tmp_1 = NULL, *tmp_2 = NULL;
 373     unsigned char *a_buf = NULL, *b_buf = NULL;
 374     size_t len;
 375
 376     if (!group || !curve || !curve->a || !curve->b)
 377         return 0;
 378
 379     if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL) {
 380         ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
 381         goto err;
 382     }
 383
 384     /* get a and b */
 385     if (!EC_GROUP_get_curve(group, NULL, tmp_1, tmp_2, NULL)) {
 386         ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
 387         goto err;
 388     }
 389
 390     /*
 391      * Per SEC 1, the curve coefficients must be padded up to size. See C.2's
 392      * definition of Curve, C.1's definition of FieldElement, and 2.3.5's
 393      * definition of how to encode the field elements.
 394      */
 395     len = ((size_t)EC_GROUP_get_degree(group) + 7) / 8;
 396     if ((a_buf = OPENSSL_malloc(len)) == NULL
 397         || (b_buf = OPENSSL_malloc(len)) == NULL) {
 398         ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
 399         goto err;
 400     }
 401     if (BN_bn2binpad(tmp_1, a_buf, len) < 0
 402         || BN_bn2binpad(tmp_2, b_buf, len) < 0) {
 403         ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
 404         goto err;
 405     }
 406
 407     /* set a and b */
 408     if (!ASN1_OCTET_STRING_set(curve->a, a_buf, len)
 409         || !ASN1_OCTET_STRING_set(curve->b, b_buf, len)) {
 410         ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
 411         goto err;
 412     }
 413
 414     /* set the seed (optional) */
 415     if (group->seed) {
 416         if (!curve->seed)
 417             if ((curve->seed = ASN1_BIT_STRING_new()) == NULL) {
 418                 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
 419                 goto err;
 420             }
 421         curve->seed->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
 422         curve->seed->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 423         if (!ASN1_BIT_STRING_set(curve->seed, group->seed,
 424                                  (int)group->seed_len)) {
 425             ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
 426             goto err;
 427         }
 428     } else {
 429         ASN1_BIT_STRING_free(curve->seed);
 430         curve->seed = NULL;
 431     }
 432
 433     ok = 1;
 434
 435  err:
 436     OPENSSL_free(a_buf);
 437     OPENSSL_free(b_buf);
 438     BN_free(tmp_1);
 439     BN_free(tmp_2);
 440     return ok;
 441 }
 442
 443 ECPARAMETERS *EC_GROUP_get_ecparameters(const EC_GROUP *group,
 444                                                ECPARAMETERS *params)
 445 {
 446     size_t len = 0;
 447     ECPARAMETERS *ret = NULL;
 448     const BIGNUM *tmp;
 449     unsigned char *buffer = NULL;
 450     const EC_POINT *point = NULL;
 451     point_conversion_form_t form;
 452     ASN1_INTEGER *orig;
 453
 454     if (params == NULL) {
 455         if ((ret = ECPARAMETERS_new()) == NULL) {
 456             ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
 457             goto err;
 458         }
 459     } else
 460         ret = params;
 461
 462     /* set the version (always one) */
 463     ret->version = (long)0x1;
 464
 465     /* set the fieldID */
 466     if (!ec_asn1_group2fieldid(group, ret->fieldID)) {
 467         ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
 468         goto err;
 469     }
 470
 471     /* set the curve */
 472     if (!ec_asn1_group2curve(group, ret->curve)) {
 473         ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
 474         goto err;
 475     }
 476
 477     /* set the base point */
 478     if ((point = EC_GROUP_get0_generator(group)) == NULL) {
 479         ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, EC_R_UNDEFINED_GENERATOR);
 480         goto err;
 481     }
 482
 483     form = EC_GROUP_get_point_conversion_form(group);
 484
 485     len = EC_POINT_point2buf(group, point, form, &buffer, NULL);
 486     if (len == 0) {
 487         ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
 488         goto err;
 489     }
 490     if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) {
 491         OPENSSL_free(buffer);
 492         ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
 493         goto err;
 494     }
 495     ASN1_STRING_set0(ret->base, buffer, len);
 496
 497     /* set the order */
 498     tmp = EC_GROUP_get0_order(group);
 499     if (tmp == NULL) {
 500         ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
 501         goto err;
 502     }
 503     ret->order = BN_to_ASN1_INTEGER(tmp, orig = ret->order);
 504     if (ret->order == NULL) {
 505         ret->order = orig;
 506         ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_ASN1_LIB);
 507         goto err;
 508     }
 509
 510     /* set the cofactor (optional) */
 511     tmp = EC_GROUP_get0_cofactor(group);
 512     if (tmp != NULL) {
 513         ret->cofactor = BN_to_ASN1_INTEGER(tmp, orig = ret->cofactor);
 514         if (ret->cofactor == NULL) {
 515             ret->cofactor = orig;
 516             ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_ASN1_LIB);
 517             goto err;
 518         }
 519     }
 520
 521     return ret;
 522
 523  err:
 524     if (params == NULL)
 525         ECPARAMETERS_free(ret);
 526     return NULL;
 527 }
 528
 529 ECPKPARAMETERS *EC_GROUP_get_ecpkparameters(const EC_GROUP *group,
 530                                             ECPKPARAMETERS *params)
 531 {
 532     int ok = 1, tmp;
 533     ECPKPARAMETERS *ret = params;
 534
 535     if (ret == NULL) {
 536         if ((ret = ECPKPARAMETERS_new()) == NULL) {
 537             ECerr(EC_F_EC_GROUP_GET_ECPKPARAMETERS, ERR_R_MALLOC_FAILURE);
 538             return NULL;
 539         }
 540     } else {
 541         if (ret->type == 0)
 542             ASN1_OBJECT_free(ret->value.named_curve);
 543         else if (ret->type == 1 && ret->value.parameters)
 544             ECPARAMETERS_free(ret->value.parameters);
 545     }
 546
 547     if (EC_GROUP_get_asn1_flag(group)) {
 548         /*
 549          * use the asn1 OID to describe the elliptic curve parameters
 550          */
 551         tmp = EC_GROUP_get_curve_name(group);
 552         if (tmp) {
 553             ret->type = 0;
 554             if ((ret->value.named_curve = OBJ_nid2obj(tmp)) == NULL)
 555                 ok = 0;
 556         } else
 557             /* we don't know the nid => ERROR */
 558             ok = 0;
 559     } else {
 560         /* use the ECPARAMETERS structure */
 561         ret->type = 1;
 562         if ((ret->value.parameters =
 563              EC_GROUP_get_ecparameters(group, NULL)) == NULL)
 564             ok = 0;
 565     }
 566
 567     if (!ok) {
 568         ECPKPARAMETERS_free(ret);
 569         return NULL;
 570     }
 571     return ret;
 572 }
 573
 574 EC_GROUP *EC_GROUP_new_from_ecparameters(const ECPARAMETERS *params)
 575 {
 576     int ok = 0, tmp;
 577     EC_GROUP *ret = NULL, *dup = NULL;
 578     BIGNUM *p = NULL, *a = NULL, *b = NULL;
 579     EC_POINT *point = NULL;
 580     long field_bits;
 581     int curve_name = NID_undef;
 582     BN_CTX *ctx = NULL;
 583
 584     if (params->fieldID == NULL
 585             || params->fieldID->fieldType == NULL
 586             || params->fieldID->p.ptr == NULL) {
 587         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
 588         goto err;
 589     }
 590
 591     /*
 592      * Now extract the curve parameters a and b. Note that, although SEC 1
 593      * specifies the length of their encodings, historical versions of OpenSSL
 594      * encoded them incorrectly, so we must accept any length for backwards
 595      * compatibility.
 596      */
 597     if (params->curve == NULL
 598             || params->curve->a == NULL || params->curve->a->data == NULL
 599             || params->curve->b == NULL || params->curve->b->data == NULL) {
 600         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
 601         goto err;
 602     }
 603     a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
 604     if (a == NULL) {
 605         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB);
 606         goto err;
 607     }
 608     b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
 609     if (b == NULL) {
 610         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB);
 611         goto err;
 612     }
 613
 614     /* get the field parameters */
 615     tmp = OBJ_obj2nid(params->fieldID->fieldType);
 616     if (tmp == NID_X9_62_characteristic_two_field)
 617 #ifdef OPENSSL_NO_EC2M
 618     {
 619         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_GF2M_NOT_SUPPORTED);
 620         goto err;
 621     }
 622 #else
 623     {
 624         X9_62_CHARACTERISTIC_TWO *char_two;
 625
 626         char_two = params->fieldID->p.char_two;
 627
 628         field_bits = char_two->m;
 629         if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
 630             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_FIELD_TOO_LARGE);
 631             goto err;
 632         }
 633
 634         if ((p = BN_new()) == NULL) {
 635             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
 636             goto err;
 637         }
 638
 639         /* get the base type */
 640         tmp = OBJ_obj2nid(char_two->type);
 641
 642         if (tmp == NID_X9_62_tpBasis) {
 643             long tmp_long;
 644
 645             if (!char_two->p.tpBasis) {
 646                 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
 647                 goto err;
 648             }
 649
 650             tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis);
 651
 652             if (!(char_two->m > tmp_long && tmp_long > 0)) {
 653                 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS,
 654                       EC_R_INVALID_TRINOMIAL_BASIS);
 655                 goto err;
 656             }
 657
 658             /* create the polynomial */
 659             if (!BN_set_bit(p, (int)char_two->m))
 660                 goto err;
 661             if (!BN_set_bit(p, (int)tmp_long))
 662                 goto err;
 663             if (!BN_set_bit(p, 0))
 664                 goto err;
 665         } else if (tmp == NID_X9_62_ppBasis) {
 666             X9_62_PENTANOMIAL *penta;
 667
 668             penta = char_two->p.ppBasis;
 669             if (penta == NULL) {
 670                 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
 671                 goto err;
 672             }
 673
 674             if (!
 675                 (char_two->m > penta->k3 && penta->k3 > penta->k2
 676                  && penta->k2 > penta->k1 && penta->k1 > 0)) {
 677                 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS,
 678                       EC_R_INVALID_PENTANOMIAL_BASIS);
 679                 goto err;
 680             }
 681
 682             /* create the polynomial */
 683             if (!BN_set_bit(p, (int)char_two->m))
 684                 goto err;
 685             if (!BN_set_bit(p, (int)penta->k1))
 686                 goto err;
 687             if (!BN_set_bit(p, (int)penta->k2))
 688                 goto err;
 689             if (!BN_set_bit(p, (int)penta->k3))
 690                 goto err;
 691             if (!BN_set_bit(p, 0))
 692                 goto err;
 693         } else if (tmp == NID_X9_62_onBasis) {
 694             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_NOT_IMPLEMENTED);
 695             goto err;
 696         } else {                /* error */
 697
 698             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
 699             goto err;
 700         }
 701
 702         /* create the EC_GROUP structure */
 703         ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
 704     }
 705 #endif
 706     else if (tmp == NID_X9_62_prime_field) {
 707         /* we have a curve over a prime field */
 708         /* extract the prime number */
 709         if (params->fieldID->p.prime == NULL) {
 710             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
 711             goto err;
 712         }
 713         p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
 714         if (p == NULL) {
 715             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
 716             goto err;
 717         }
 718
 719         if (BN_is_negative(p) || BN_is_zero(p)) {
 720             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_FIELD);
 721             goto err;
 722         }
 723
 724         field_bits = BN_num_bits(p);
 725         if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
 726             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_FIELD_TOO_LARGE);
 727             goto err;
 728         }
 729
 730         /* create the EC_GROUP structure */
 731         ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
 732     } else {
 733         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_FIELD);
 734         goto err;
 735     }
 736
 737     if (ret == NULL) {
 738         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
 739         goto err;
 740     }
 741
 742     /* extract seed (optional) */
 743     if (params->curve->seed != NULL) {
 744         OPENSSL_free(ret->seed);
 745         if ((ret->seed = OPENSSL_malloc(params->curve->seed->length)) == NULL) {
 746             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
 747             goto err;
 748         }
 749         memcpy(ret->seed, params->curve->seed->data,
 750                params->curve->seed->length);
 751         ret->seed_len = params->curve->seed->length;
 752     }
 753
 754     if (params->order == NULL
 755             || params->base == NULL
 756             || params->base->data == NULL) {
 757         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
 758         goto err;
 759     }
 760
 761     if ((point = EC_POINT_new(ret)) == NULL)
 762         goto err;
 763
 764     /* set the point conversion form */
 765     EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
 766                                        (params->base->data[0] & ~0x01));
 767
 768     /* extract the ec point */
 769     if (!EC_POINT_oct2point(ret, point, params->base->data,
 770                             params->base->length, NULL)) {
 771         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
 772         goto err;
 773     }
 774
 775     /* extract the order */
 776     if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL) {
 777         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
 778         goto err;
 779     }
 780     if (BN_is_negative(a) || BN_is_zero(a)) {
 781         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_GROUP_ORDER);
 782         goto err;
 783     }
 784     if (BN_num_bits(a) > (int)field_bits + 1) { /* Hasse bound */
 785         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_GROUP_ORDER);
 786         goto err;
 787     }
 788
 789     /* extract the cofactor (optional) */
 790     if (params->cofactor == NULL) {
 791         BN_free(b);
 792         b = NULL;
 793     } else if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL) {
 794         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
 795         goto err;
 796     }
 797     /* set the generator, order and cofactor (if present) */
 798     if (!EC_GROUP_set_generator(ret, point, a, b)) {
 799         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
 800         goto err;
 801     }
 802
 803     /*
 804      * Check if the explicit parameters group just created matches one of the
 805      * built-in curves.
 806      *
 807      * We create a copy of the group just built, so that we can remove optional
 808      * fields for the lookup: we do this to avoid the possibility that one of
 809      * the optional parameters is used to force the library into using a less
 810      * performant and less secure EC_METHOD instead of the specialized one.
 811      * In any case, `seed` is not really used in any computation, while a
 812      * cofactor different from the one in the built-in table is just
 813      * mathematically wrong anyway and should not be used.
 814      */
 815     if ((ctx = BN_CTX_new()) == NULL) {
 816         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB);
 817         goto err;
 818     }
 819     if ((dup = EC_GROUP_dup(ret)) == NULL
 820             || EC_GROUP_set_seed(dup, NULL, 0) != 1
 821             || !EC_GROUP_set_generator(dup, point, a, NULL)) {
 822         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
 823         goto err;
 824     }
 825     if ((curve_name = ec_curve_nid_from_params(dup, ctx)) != NID_undef) {
 826         /*
 827          * The input explicit parameters successfully matched one of the
 828          * built-in curves: often for built-in curves we have specialized
 829          * methods with better performance and hardening.
 830          *
 831          * In this case we replace the `EC_GROUP` created through explicit
 832          * parameters with one created from a named group.
 833          */
 834         EC_GROUP *named_group = NULL;
 835
 836 #ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
 837         /*
 838          * NID_wap_wsg_idm_ecid_wtls12 and NID_secp224r1 are both aliases for
 839          * the same curve, we prefer the SECP nid when matching explicit
 840          * parameters as that is associated with a specialized EC_METHOD.
 841          */
 842         if (curve_name == NID_wap_wsg_idm_ecid_wtls12)
 843             curve_name = NID_secp224r1;
 844 #endif /* !def(OPENSSL_NO_EC_NISTP_64_GCC_128) */
 845
 846         if ((named_group = EC_GROUP_new_by_curve_name(curve_name)) == NULL) {
 847             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
 848             goto err;
 849         }
 850         EC_GROUP_free(ret);
 851         ret = named_group;
 852
 853         /*
 854          * Set the flag so that EC_GROUPs created from explicit parameters are
 855          * serialized using explicit parameters by default.
 856          */
 857         EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_EXPLICIT_CURVE);
 858
 859         /*
 860          * If the input params do not contain the optional seed field we make
 861          * sure it is not added to the returned group.
 862          *
 863          * The seed field is not really used inside libcrypto anyway, and
 864          * adding it to parsed explicit parameter keys would alter their DER
 865          * encoding output (because of the extra field) which could impact
 866          * applications fingerprinting keys by their DER encoding.
 867          */
 868         if (params->curve->seed == NULL) {
 869             if (EC_GROUP_set_seed(ret, NULL, 0) != 1)
 870                 goto err;
 871         }
 872     }
 873
 874     ok = 1;
 875
 876  err:
 877     if (!ok) {
 878         EC_GROUP_free(ret);
 879         ret = NULL;
 880     }
 881     EC_GROUP_free(dup);
 882
 883     BN_free(p);
 884     BN_free(a);
 885     BN_free(b);
 886     EC_POINT_free(point);
 887
 888     BN_CTX_free(ctx);
 889
 890     return ret;
 891 }
 892
 893 EC_GROUP *EC_GROUP_new_from_ecpkparameters(const ECPKPARAMETERS *params)
 894 {
 895     EC_GROUP *ret = NULL;
 896     int tmp = 0;
 897
 898     if (params == NULL) {
 899         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, EC_R_MISSING_PARAMETERS);
 900         return NULL;
 901     }
 902
 903     if (params->type == 0) {    /* the curve is given by an OID */
 904         tmp = OBJ_obj2nid(params->value.named_curve);
 905         if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL) {
 906             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS,
 907                   EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
 908             return NULL;
 909         }
 910         EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
 911     } else if (params->type == 1) { /* the parameters are given by a
 912                                      * ECPARAMETERS structure */
 913         ret = EC_GROUP_new_from_ecparameters(params->value.parameters);
 914         if (!ret) {
 915             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, ERR_R_EC_LIB);
 916             return NULL;
 917         }
 918         EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_EXPLICIT_CURVE);
 919     } else if (params->type == 2) { /* implicitlyCA */
 920         return NULL;
 921     } else {
 922         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, EC_R_ASN1_ERROR);
 923         return NULL;
 924     }
 925
 926     return ret;
 927 }
 928
 929 /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
 930
 931 EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len)
 932 {
 933     EC_GROUP *group = NULL;
 934     ECPKPARAMETERS *params = NULL;
 935     const unsigned char *p = *in;
 936
 937     if ((params = d2i_ECPKPARAMETERS(NULL, &p, len)) == NULL) {
 938         ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_D2I_ECPKPARAMETERS_FAILURE);
 939         ECPKPARAMETERS_free(params);
 940         return NULL;
 941     }
 942
 943     if ((group = EC_GROUP_new_from_ecpkparameters(params)) == NULL) {
 944         ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_PKPARAMETERS2GROUP_FAILURE);
 945         ECPKPARAMETERS_free(params);
 946         return NULL;
 947     }
 948
 949     if (a) {
 950         EC_GROUP_free(*a);
 951         *a = group;
 952     }
 953
 954     ECPKPARAMETERS_free(params);
 955     *in = p;
 956     return group;
 957 }
 958
 959 int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out)
 960 {
 961     int ret = 0;
 962     ECPKPARAMETERS *tmp = EC_GROUP_get_ecpkparameters(a, NULL);
 963     if (tmp == NULL) {
 964         ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_GROUP2PKPARAMETERS_FAILURE);
 965         return 0;
 966     }
 967     if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) {
 968         ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_I2D_ECPKPARAMETERS_FAILURE);
 969         ECPKPARAMETERS_free(tmp);
 970         return 0;
 971     }
 972     ECPKPARAMETERS_free(tmp);
 973     return ret;
 974 }
 975
 976 /* some EC_KEY functions */
 977
 978 EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
 979 {
 980     EC_KEY *ret = NULL;
 981     EC_PRIVATEKEY *priv_key = NULL;
 982     const unsigned char *p = *in;
 983
 984     if ((priv_key = d2i_EC_PRIVATEKEY(NULL, &p, len)) == NULL) {
 985         ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
 986         return NULL;
 987     }
 988
 989     if (a == NULL || *a == NULL) {
 990         if ((ret = EC_KEY_new()) == NULL) {
 991             ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
 992             goto err;
 993         }
 994     } else
 995         ret = *a;
 996
 997     if (priv_key->parameters) {
 998         EC_GROUP_free(ret->group);
 999         ret->group = EC_GROUP_new_from_ecpkparameters(priv_key->parameters);
1000     }
1001
1002     if (ret->group == NULL) {
1003         ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1004         goto err;
1005     }
1006
1007     ret->version = priv_key->version;
1008
1009     if (priv_key->privateKey) {
1010         ASN1_OCTET_STRING *pkey = priv_key->privateKey;
1011         if (EC_KEY_oct2priv(ret, ASN1_STRING_get0_data(pkey),
1012                             ASN1_STRING_length(pkey)) == 0)
1013             goto err;
1014     } else {
1015         ECerr(EC_F_D2I_ECPRIVATEKEY, EC_R_MISSING_PRIVATE_KEY);
1016         goto err;
1017     }
1018
1019     EC_POINT_clear_free(ret->pub_key);
1020     ret->pub_key = EC_POINT_new(ret->group);
1021     if (ret->pub_key == NULL) {
1022         ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1023         goto err;
1024     }
1025
1026     if (priv_key->publicKey) {
1027         const unsigned char *pub_oct;
1028         int pub_oct_len;
1029
1030         pub_oct = ASN1_STRING_get0_data(priv_key->publicKey);
1031         pub_oct_len = ASN1_STRING_length(priv_key->publicKey);
1032         if (!EC_KEY_oct2key(ret, pub_oct, pub_oct_len, NULL)) {
1033             ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1034             goto err;
1035         }
1036     } else {
1037         if (ret->group->meth->keygenpub == NULL
1038             || ret->group->meth->keygenpub(ret) == 0)
1039                 goto err;
1040         /* Remember the original private-key-only encoding. */
1041         ret->enc_flag |= EC_PKEY_NO_PUBKEY;
1042     }
1043
1044     if (a)
1045         *a = ret;
1046     EC_PRIVATEKEY_free(priv_key);
1047     *in = p;
1048     return ret;
1049
1050  err:
1051     if (a == NULL || *a != ret)
1052         EC_KEY_free(ret);
1053     EC_PRIVATEKEY_free(priv_key);
1054     return NULL;
1055 }
1056
1057 int i2d_ECPrivateKey(const EC_KEY *a, unsigned char **out)
1058 {
1059     int ret = 0, ok = 0;
1060     unsigned char *priv= NULL, *pub= NULL;
1061     size_t privlen = 0, publen = 0;
1062
1063     EC_PRIVATEKEY *priv_key = NULL;
1064
1065     if (a == NULL || a->group == NULL ||
1066         (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key == NULL)) {
1067         ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_PASSED_NULL_PARAMETER);
1068         goto err;
1069     }
1070
1071     if ((priv_key = EC_PRIVATEKEY_new()) == NULL) {
1072         ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1073         goto err;
1074     }
1075
1076     priv_key->version = a->version;
1077
1078     privlen = EC_KEY_priv2buf(a, &priv);
1079
1080     if (privlen == 0) {
1081         ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1082         goto err;
1083     }
1084
1085     ASN1_STRING_set0(priv_key->privateKey, priv, privlen);
1086     priv = NULL;
1087
1088     if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS)) {
1089         if ((priv_key->parameters =
1090              EC_GROUP_get_ecpkparameters(a->group,
1091                                         priv_key->parameters)) == NULL) {
1092             ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1093             goto err;
1094         }
1095     }
1096
1097     if (!(a->enc_flag & EC_PKEY_NO_PUBKEY)) {
1098         priv_key->publicKey = ASN1_BIT_STRING_new();
1099         if (priv_key->publicKey == NULL) {
1100             ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1101             goto err;
1102         }
1103
1104         publen = EC_KEY_key2buf(a, a->conv_form, &pub, NULL);
1105
1106         if (publen == 0) {
1107             ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1108             goto err;
1109         }
1110
1111         priv_key->publicKey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
1112         priv_key->publicKey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
1113         ASN1_STRING_set0(priv_key->publicKey, pub, publen);
1114         pub = NULL;
1115     }
1116
1117     if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) {
1118         ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1119         goto err;
1120     }
1121     ok = 1;
1122  err:
1123     OPENSSL_clear_free(priv, privlen);
1124     OPENSSL_free(pub);
1125     EC_PRIVATEKEY_free(priv_key);
1126     return (ok ? ret : 0);
1127 }
1128
1129 int i2d_ECParameters(const EC_KEY *a, unsigned char **out)
1130 {
1131     if (a == NULL) {
1132         ECerr(EC_F_I2D_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1133         return 0;
1134     }
1135     return i2d_ECPKParameters(a->group, out);
1136 }
1137
1138 EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len)
1139 {
1140     EC_KEY *ret;
1141
1142     if (in == NULL || *in == NULL) {
1143         ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1144         return NULL;
1145     }
1146
1147     if (a == NULL || *a == NULL) {
1148         if ((ret = EC_KEY_new()) == NULL) {
1149             ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
1150             return NULL;
1151         }
1152     } else
1153         ret = *a;
1154
1155     if (!d2i_ECPKParameters(&ret->group, in, len)) {
1156         ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_EC_LIB);
1157         if (a == NULL || *a != ret)
1158              EC_KEY_free(ret);
1159         return NULL;
1160     }
1161
1162     if (a)
1163         *a = ret;
1164
1165     return ret;
1166 }
1167
1168 EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len)
1169 {
1170     EC_KEY *ret = NULL;
1171
1172     if (a == NULL || (*a) == NULL || (*a)->group == NULL) {
1173         /*
1174          * sorry, but a EC_GROUP-structure is necessary to set the public key
1175          */
1176         ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1177         return 0;
1178     }
1179     ret = *a;
1180     if (!EC_KEY_oct2key(ret, *in, len, NULL)) {
1181         ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_EC_LIB);
1182         return 0;
1183     }
1184     *in += len;
1185     return ret;
1186 }
1187
1188 int i2o_ECPublicKey(const EC_KEY *a, unsigned char **out)
1189 {
1190     size_t buf_len = 0;
1191     int new_buffer = 0;
1192
1193     if (a == NULL) {
1194         ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1195         return 0;
1196     }
1197
1198     buf_len = EC_POINT_point2oct(a->group, a->pub_key,
1199                                  a->conv_form, NULL, 0, NULL);
1200
1201     if (out == NULL || buf_len == 0)
1202         /* out == NULL => just return the length of the octet string */
1203         return buf_len;
1204
1205     if (*out == NULL) {
1206         if ((*out = OPENSSL_malloc(buf_len)) == NULL) {
1207             ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
1208             return 0;
1209         }
1210         new_buffer = 1;
1211     }
1212     if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form,
1213                             *out, buf_len, NULL)) {
1214         ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_EC_LIB);
1215         if (new_buffer) {
1216             OPENSSL_free(*out);
1217             *out = NULL;
1218         }
1219         return 0;
1220     }
1221     if (!new_buffer)
1222         *out += buf_len;
1223     return buf_len;
1224 }
1225
1226 DECLARE_ASN1_FUNCTIONS(ECDSA_SIG)
1227 DECLARE_ASN1_ENCODE_FUNCTIONS_name(ECDSA_SIG, ECDSA_SIG)
1228
1229 #endif /* FIPS_MODE */
1230
1231 ECDSA_SIG *ECDSA_SIG_new(void)
1232 {
1233     ECDSA_SIG *sig = OPENSSL_zalloc(sizeof(*sig));
1234     if (sig == NULL)
1235         ECerr(EC_F_ECDSA_SIG_NEW, ERR_R_MALLOC_FAILURE);
1236     return sig;
1237 }
1238
1239 void ECDSA_SIG_free(ECDSA_SIG *sig)
1240 {
1241     if (sig == NULL)
1242         return;
1243     BN_clear_free(sig->r);
1244     BN_clear_free(sig->s);
1245     OPENSSL_free(sig);
1246 }
1247
1248 ECDSA_SIG *d2i_ECDSA_SIG(ECDSA_SIG **psig, const unsigned char **ppin, long len)
1249 {
1250     ECDSA_SIG *sig;
1251
1252     if (len < 0)
1253         return NULL;
1254     if (psig != NULL && *psig != NULL) {
1255         sig = *psig;
1256     } else {
1257         sig = ECDSA_SIG_new();
1258         if (sig == NULL)
1259             return NULL;
1260     }
1261     if (sig->r == NULL)
1262         sig->r = BN_new();
1263     if (sig->s == NULL)
1264         sig->s = BN_new();
1265     if (decode_der_dsa_sig(sig->r, sig->s, ppin, (size_t)len) == 0) {
1266         if (psig == NULL || *psig == NULL)
1267             ECDSA_SIG_free(sig);
1268         return NULL;
1269     }
1270     if (psig != NULL && *psig == NULL)
1271         *psig = sig;
1272     return sig;
1273 }
1274
1275 int i2d_ECDSA_SIG(const ECDSA_SIG *sig, unsigned char **ppout)
1276 {
1277     BUF_MEM *buf = NULL;
1278     size_t encoded_len;
1279     WPACKET pkt;
1280
1281     if (ppout == NULL) {
1282         if (!WPACKET_init_null(&pkt, 0))
1283             return -1;
1284     } else if (*ppout == NULL) {
1285         if ((buf = BUF_MEM_new()) == NULL
1286                 || !WPACKET_init_len(&pkt, buf, 0)) {
1287             BUF_MEM_free(buf);
1288             return -1;
1289         }
1290     } else {
1291         if (!WPACKET_init_static_len(&pkt, *ppout, SIZE_MAX, 0))
1292             return -1;
1293     }
1294
1295     if (!encode_der_dsa_sig(&pkt, sig->r, sig->s)
1296             || !WPACKET_get_total_written(&pkt, &encoded_len)
1297             || !WPACKET_finish(&pkt)) {
1298         BUF_MEM_free(buf);
1299         WPACKET_cleanup(&pkt);
1300         return -1;
1301     }
1302
1303     if (ppout != NULL) {
1304         if (*ppout == NULL) {
1305             *ppout = (unsigned char *)buf->data;
1306             buf->data = NULL;
1307             BUF_MEM_free(buf);
1308         } else {
1309             *ppout += encoded_len;
1310         }
1311     }
1312
1313     return (int)encoded_len;
1314 }
1315
1316 void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps)
1317 {
1318     if (pr != NULL)
1319         *pr = sig->r;
1320     if (ps != NULL)
1321         *ps = sig->s;
1322 }
1323
1324 const BIGNUM *ECDSA_SIG_get0_r(const ECDSA_SIG *sig)
1325 {
1326     return sig->r;
1327 }
1328
1329 const BIGNUM *ECDSA_SIG_get0_s(const ECDSA_SIG *sig)
1330 {
1331     return sig->s;
1332 }
1333
1334 int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s)
1335 {
1336     if (r == NULL || s == NULL)
1337         return 0;
1338     BN_clear_free(sig->r);
1339     BN_clear_free(sig->s);
1340     sig->r = r;
1341     sig->s = s;
1342     return 1;
1343 }
1344
1345 int ECDSA_size(const EC_KEY *ec)
1346 {
1347     int ret;
1348     ECDSA_SIG sig;
1349     const EC_GROUP *group;
1350     const BIGNUM *bn;
1351
1352     if (ec == NULL)
1353         return 0;
1354     group = EC_KEY_get0_group(ec);
1355     if (group == NULL)
1356         return 0;
1357
1358     bn = EC_GROUP_get0_order(group);
1359     if (bn == NULL)
1360         return 0;
1361
1362     sig.r = sig.s = (BIGNUM *)bn;
1363     ret = i2d_ECDSA_SIG(&sig, NULL);
1364
1365     if (ret < 0)
1366         ret = 0;
1367     return ret;
1368 }