crypto/ec/ec_asn1.c

   1 /*
   2  * Copyright 2002-2020 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 /*
  11  * 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 "ec_local.h"
  18 #include <openssl/err.h>
  19 #include <openssl/asn1t.h>
  20 #include <openssl/objects.h>
  21 #include "internal/nelem.h"
  22 #include "crypto/asn1_dsa.h"
  23
  24 #ifndef FIPS_MODULE
  25
  26 /* some structures needed for the asn1 encoding */
  27 typedef struct x9_62_pentanomial_st {
  28     int32_t k1;
  29     int32_t k2;
  30     int32_t k3;
  31 } X9_62_PENTANOMIAL;
  32
  33 typedef struct x9_62_characteristic_two_st {
  34     int32_t m;
  35     ASN1_OBJECT *type;
  36     union {
  37         char *ptr;
  38         /* NID_X9_62_onBasis */
  39         ASN1_NULL *onBasis;
  40         /* NID_X9_62_tpBasis */
  41         ASN1_INTEGER *tpBasis;
  42         /* NID_X9_62_ppBasis */
  43         X9_62_PENTANOMIAL *ppBasis;
  44         /* anything else */
  45         ASN1_TYPE *other;
  46     } p;
  47 } X9_62_CHARACTERISTIC_TWO;
  48
  49 typedef struct x9_62_fieldid_st {
  50     ASN1_OBJECT *fieldType;
  51     union {
  52         char *ptr;
  53         /* NID_X9_62_prime_field */
  54         ASN1_INTEGER *prime;
  55         /* NID_X9_62_characteristic_two_field */
  56         X9_62_CHARACTERISTIC_TWO *char_two;
  57         /* anything else */
  58         ASN1_TYPE *other;
  59     } p;
  60 } X9_62_FIELDID;
  61
  62 typedef struct x9_62_curve_st {
  63     ASN1_OCTET_STRING *a;
  64     ASN1_OCTET_STRING *b;
  65     ASN1_BIT_STRING *seed;
  66 } X9_62_CURVE;
  67
  68 struct ec_parameters_st {
  69     int32_t version;
  70     X9_62_FIELDID *fieldID;
  71     X9_62_CURVE *curve;
  72     ASN1_OCTET_STRING *base;
  73     ASN1_INTEGER *order;
  74     ASN1_INTEGER *cofactor;
  75 } /* ECPARAMETERS */ ;
  76
  77 typedef enum {
  78     ECPKPARAMETERS_TYPE_NAMED = 0,
  79     ECPKPARAMETERS_TYPE_EXPLICIT,
  80     ECPKPARAMETERS_TYPE_IMPLICIT
  81 } ecpk_parameters_type_t;
  82
  83 struct ecpk_parameters_st {
  84     int type;
  85     union {
  86         ASN1_OBJECT *named_curve;
  87         ECPARAMETERS *parameters;
  88         ASN1_NULL *implicitlyCA;
  89     } value;
  90 } /* ECPKPARAMETERS */ ;
  91
  92 /* SEC1 ECPrivateKey */
  93 typedef struct ec_privatekey_st {
  94     int32_t version;
  95     ASN1_OCTET_STRING *privateKey;
  96     ECPKPARAMETERS *parameters;
  97     ASN1_BIT_STRING *publicKey;
  98 } EC_PRIVATEKEY;
  99
 100 /* the OpenSSL ASN.1 definitions */
 101 ASN1_SEQUENCE(X9_62_PENTANOMIAL) = {
 102         ASN1_EMBED(X9_62_PENTANOMIAL, k1, INT32),
 103         ASN1_EMBED(X9_62_PENTANOMIAL, k2, INT32),
 104         ASN1_EMBED(X9_62_PENTANOMIAL, k3, INT32)
 105 } static_ASN1_SEQUENCE_END(X9_62_PENTANOMIAL)
 106
 107 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
 108 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
 109
 110 ASN1_ADB_TEMPLATE(char_two_def) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.other, ASN1_ANY);
 111
 112 ASN1_ADB(X9_62_CHARACTERISTIC_TWO) = {
 113         ADB_ENTRY(NID_X9_62_onBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.onBasis, ASN1_NULL)),
 114         ADB_ENTRY(NID_X9_62_tpBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.tpBasis, ASN1_INTEGER)),
 115         ADB_ENTRY(NID_X9_62_ppBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.ppBasis, X9_62_PENTANOMIAL))
 116 } ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO, 0, type, 0, &char_two_def_tt, NULL);
 117
 118 ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO) = {
 119         ASN1_EMBED(X9_62_CHARACTERISTIC_TWO, m, INT32),
 120         ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, type, ASN1_OBJECT),
 121         ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO)
 122 } static_ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO)
 123
 124 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
 125 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
 126
 127 ASN1_ADB_TEMPLATE(fieldID_def) = ASN1_SIMPLE(X9_62_FIELDID, p.other, ASN1_ANY);
 128
 129 ASN1_ADB(X9_62_FIELDID) = {
 130         ADB_ENTRY(NID_X9_62_prime_field, ASN1_SIMPLE(X9_62_FIELDID, p.prime, ASN1_INTEGER)),
 131         ADB_ENTRY(NID_X9_62_characteristic_two_field, ASN1_SIMPLE(X9_62_FIELDID, p.char_two, X9_62_CHARACTERISTIC_TWO))
 132 } ASN1_ADB_END(X9_62_FIELDID, 0, fieldType, 0, &fieldID_def_tt, NULL);
 133
 134 ASN1_SEQUENCE(X9_62_FIELDID) = {
 135         ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT),
 136         ASN1_ADB_OBJECT(X9_62_FIELDID)
 137 } static_ASN1_SEQUENCE_END(X9_62_FIELDID)
 138
 139 ASN1_SEQUENCE(X9_62_CURVE) = {
 140         ASN1_SIMPLE(X9_62_CURVE, a, ASN1_OCTET_STRING),
 141         ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING),
 142         ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING)
 143 } static_ASN1_SEQUENCE_END(X9_62_CURVE)
 144
 145 ASN1_SEQUENCE(ECPARAMETERS) = {
 146         ASN1_EMBED(ECPARAMETERS, version, INT32),
 147         ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID),
 148         ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE),
 149         ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING),
 150         ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER),
 151         ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER)
 152 } ASN1_SEQUENCE_END(ECPARAMETERS)
 153
 154 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
 155 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
 156
 157 ASN1_CHOICE(ECPKPARAMETERS) = {
 158         ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT),
 159         ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS),
 160         ASN1_SIMPLE(ECPKPARAMETERS, value.implicitlyCA, ASN1_NULL)
 161 } ASN1_CHOICE_END(ECPKPARAMETERS)
 162
 163 DECLARE_ASN1_FUNCTIONS(ECPKPARAMETERS)
 164 DECLARE_ASN1_ENCODE_FUNCTIONS_name(ECPKPARAMETERS, ECPKPARAMETERS)
 165 IMPLEMENT_ASN1_FUNCTIONS(ECPKPARAMETERS)
 166
 167 ASN1_SEQUENCE(EC_PRIVATEKEY) = {
 168         ASN1_EMBED(EC_PRIVATEKEY, version, INT32),
 169         ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING),
 170         ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0),
 171         ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1)
 172 } static_ASN1_SEQUENCE_END(EC_PRIVATEKEY)
 173
 174 DECLARE_ASN1_FUNCTIONS(EC_PRIVATEKEY)
 175 DECLARE_ASN1_ENCODE_FUNCTIONS_name(EC_PRIVATEKEY, EC_PRIVATEKEY)
 176 IMPLEMENT_ASN1_FUNCTIONS(EC_PRIVATEKEY)
 177
 178 /* some declarations of internal function */
 179
 180 /* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */
 181 static int ec_asn1_group2fieldid(const EC_GROUP *, X9_62_FIELDID *);
 182 /* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */
 183 static int ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *);
 184
 185 /* the function definitions */
 186
 187 static int ec_asn1_group2fieldid(const EC_GROUP *group, X9_62_FIELDID *field)
 188 {
 189     int ok = 0, nid;
 190     BIGNUM *tmp = NULL;
 191
 192     if (group == NULL || field == NULL)
 193         return 0;
 194
 195     /* clear the old values (if necessary) */
 196     ASN1_OBJECT_free(field->fieldType);
 197     ASN1_TYPE_free(field->p.other);
 198
 199     nid = EC_GROUP_get_field_type(group);
 200     /* set OID for the field */
 201     if ((field->fieldType = OBJ_nid2obj(nid)) == NULL) {
 202         ERR_raise(ERR_LIB_EC, ERR_R_OBJ_LIB);
 203         goto err;
 204     }
 205
 206     if (nid == NID_X9_62_prime_field) {
 207         if ((tmp = BN_new()) == NULL) {
 208             ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
 209             goto err;
 210         }
 211         /* the parameters are specified by the prime number p */
 212         if (!EC_GROUP_get_curve(group, tmp, NULL, NULL, NULL)) {
 213             ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 214             goto err;
 215         }
 216         /* set the prime number */
 217         field->p.prime = BN_to_ASN1_INTEGER(tmp, NULL);
 218         if (field->p.prime == NULL) {
 219             ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
 220             goto err;
 221         }
 222     } else if (nid == NID_X9_62_characteristic_two_field)
 223 #ifdef OPENSSL_NO_EC2M
 224     {
 225         ERR_raise(ERR_LIB_EC, EC_R_GF2M_NOT_SUPPORTED);
 226         goto err;
 227     }
 228 #else
 229     {
 230         int field_type;
 231         X9_62_CHARACTERISTIC_TWO *char_two;
 232
 233         field->p.char_two = X9_62_CHARACTERISTIC_TWO_new();
 234         char_two = field->p.char_two;
 235
 236         if (char_two == NULL) {
 237             ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
 238             goto err;
 239         }
 240
 241         char_two->m = (long)EC_GROUP_get_degree(group);
 242
 243         field_type = EC_GROUP_get_basis_type(group);
 244
 245         if (field_type == 0) {
 246             ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 247             goto err;
 248         }
 249         /* set base type OID */
 250         if ((char_two->type = OBJ_nid2obj(field_type)) == NULL) {
 251             ERR_raise(ERR_LIB_EC, ERR_R_OBJ_LIB);
 252             goto err;
 253         }
 254
 255         if (field_type == NID_X9_62_tpBasis) {
 256             unsigned int k;
 257
 258             if (!EC_GROUP_get_trinomial_basis(group, &k))
 259                 goto err;
 260
 261             char_two->p.tpBasis = ASN1_INTEGER_new();
 262             if (char_two->p.tpBasis == NULL) {
 263                 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
 264                 goto err;
 265             }
 266             if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k)) {
 267                 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
 268                 goto err;
 269             }
 270         } else if (field_type == NID_X9_62_ppBasis) {
 271             unsigned int k1, k2, k3;
 272
 273             if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3))
 274                 goto err;
 275
 276             char_two->p.ppBasis = X9_62_PENTANOMIAL_new();
 277             if (char_two->p.ppBasis == NULL) {
 278                 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
 279                 goto err;
 280             }
 281
 282             /* set k? values */
 283             char_two->p.ppBasis->k1 = (long)k1;
 284             char_two->p.ppBasis->k2 = (long)k2;
 285             char_two->p.ppBasis->k3 = (long)k3;
 286         } else {                /* field_type == NID_X9_62_onBasis */
 287
 288             /* for ONB the parameters are (asn1) NULL */
 289             char_two->p.onBasis = ASN1_NULL_new();
 290             if (char_two->p.onBasis == NULL) {
 291                 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
 292                 goto err;
 293             }
 294         }
 295     }
 296 #endif
 297     else {
 298         ERR_raise(ERR_LIB_EC, EC_R_UNSUPPORTED_FIELD);
 299         goto err;
 300     }
 301
 302     ok = 1;
 303
 304  err:
 305     BN_free(tmp);
 306     return ok;
 307 }
 308
 309 static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
 310 {
 311     int ok = 0;
 312     BIGNUM *tmp_1 = NULL, *tmp_2 = NULL;
 313     unsigned char *a_buf = NULL, *b_buf = NULL;
 314     size_t len;
 315
 316     if (!group || !curve || !curve->a || !curve->b)
 317         return 0;
 318
 319     if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL) {
 320         ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
 321         goto err;
 322     }
 323
 324     /* get a and b */
 325     if (!EC_GROUP_get_curve(group, NULL, tmp_1, tmp_2, NULL)) {
 326         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 327         goto err;
 328     }
 329
 330     /*
 331      * Per SEC 1, the curve coefficients must be padded up to size. See C.2's
 332      * definition of Curve, C.1's definition of FieldElement, and 2.3.5's
 333      * definition of how to encode the field elements.
 334      */
 335     len = ((size_t)EC_GROUP_get_degree(group) + 7) / 8;
 336     if ((a_buf = OPENSSL_malloc(len)) == NULL
 337         || (b_buf = OPENSSL_malloc(len)) == NULL) {
 338         ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
 339         goto err;
 340     }
 341     if (BN_bn2binpad(tmp_1, a_buf, len) < 0
 342         || BN_bn2binpad(tmp_2, b_buf, len) < 0) {
 343         ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
 344         goto err;
 345     }
 346
 347     /* set a and b */
 348     if (!ASN1_OCTET_STRING_set(curve->a, a_buf, len)
 349         || !ASN1_OCTET_STRING_set(curve->b, b_buf, len)) {
 350         ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
 351         goto err;
 352     }
 353
 354     /* set the seed (optional) */
 355     if (group->seed) {
 356         if (!curve->seed)
 357             if ((curve->seed = ASN1_BIT_STRING_new()) == NULL) {
 358                 ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
 359                 goto err;
 360             }
 361         curve->seed->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
 362         curve->seed->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 363         if (!ASN1_BIT_STRING_set(curve->seed, group->seed,
 364                                  (int)group->seed_len)) {
 365             ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
 366             goto err;
 367         }
 368     } else {
 369         ASN1_BIT_STRING_free(curve->seed);
 370         curve->seed = NULL;
 371     }
 372
 373     ok = 1;
 374
 375  err:
 376     OPENSSL_free(a_buf);
 377     OPENSSL_free(b_buf);
 378     BN_free(tmp_1);
 379     BN_free(tmp_2);
 380     return ok;
 381 }
 382
 383 ECPARAMETERS *EC_GROUP_get_ecparameters(const EC_GROUP *group,
 384                                         ECPARAMETERS *params)
 385 {
 386     size_t len = 0;
 387     ECPARAMETERS *ret = NULL;
 388     const BIGNUM *tmp;
 389     unsigned char *buffer = NULL;
 390     const EC_POINT *point = NULL;
 391     point_conversion_form_t form;
 392     ASN1_INTEGER *orig;
 393
 394     if (params == NULL) {
 395         if ((ret = ECPARAMETERS_new()) == NULL) {
 396             ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
 397             goto err;
 398         }
 399     } else
 400         ret = params;
 401
 402     /* set the version (always one) */
 403     ret->version = (long)0x1;
 404
 405     /* set the fieldID */
 406     if (!ec_asn1_group2fieldid(group, ret->fieldID)) {
 407         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 408         goto err;
 409     }
 410
 411     /* set the curve */
 412     if (!ec_asn1_group2curve(group, ret->curve)) {
 413         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 414         goto err;
 415     }
 416
 417     /* set the base point */
 418     if ((point = EC_GROUP_get0_generator(group)) == NULL) {
 419         ERR_raise(ERR_LIB_EC, EC_R_UNDEFINED_GENERATOR);
 420         goto err;
 421     }
 422
 423     form = EC_GROUP_get_point_conversion_form(group);
 424
 425     len = EC_POINT_point2buf(group, point, form, &buffer, NULL);
 426     if (len == 0) {
 427         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 428         goto err;
 429     }
 430     if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) {
 431         OPENSSL_free(buffer);
 432         ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
 433         goto err;
 434     }
 435     ASN1_STRING_set0(ret->base, buffer, len);
 436
 437     /* set the order */
 438     tmp = EC_GROUP_get0_order(group);
 439     if (tmp == NULL) {
 440         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 441         goto err;
 442     }
 443     ret->order = BN_to_ASN1_INTEGER(tmp, orig = ret->order);
 444     if (ret->order == NULL) {
 445         ret->order = orig;
 446         ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
 447         goto err;
 448     }
 449
 450     /* set the cofactor (optional) */
 451     tmp = EC_GROUP_get0_cofactor(group);
 452     if (tmp != NULL) {
 453         ret->cofactor = BN_to_ASN1_INTEGER(tmp, orig = ret->cofactor);
 454         if (ret->cofactor == NULL) {
 455             ret->cofactor = orig;
 456             ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
 457             goto err;
 458         }
 459     }
 460
 461     return ret;
 462
 463  err:
 464     if (params == NULL)
 465         ECPARAMETERS_free(ret);
 466     return NULL;
 467 }
 468
 469 ECPKPARAMETERS *EC_GROUP_get_ecpkparameters(const EC_GROUP *group,
 470                                             ECPKPARAMETERS *params)
 471 {
 472     int ok = 1, tmp;
 473     ECPKPARAMETERS *ret = params;
 474
 475     if (ret == NULL) {
 476         if ((ret = ECPKPARAMETERS_new()) == NULL) {
 477             ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
 478             return NULL;
 479         }
 480     } else {
 481         if (ret->type == ECPKPARAMETERS_TYPE_NAMED)
 482             ASN1_OBJECT_free(ret->value.named_curve);
 483         else if (ret->type == ECPKPARAMETERS_TYPE_EXPLICIT
 484                  && ret->value.parameters != NULL)
 485             ECPARAMETERS_free(ret->value.parameters);
 486     }
 487
 488     if (EC_GROUP_get_asn1_flag(group)) {
 489         /*
 490          * use the asn1 OID to describe the elliptic curve parameters
 491          */
 492         tmp = EC_GROUP_get_curve_name(group);
 493         if (tmp) {
 494             ASN1_OBJECT *asn1obj = OBJ_nid2obj(tmp);
 495
 496             if (asn1obj == NULL || OBJ_length(asn1obj) == 0) {
 497                 ASN1_OBJECT_free(asn1obj);
 498                 ERR_raise(ERR_LIB_EC, EC_R_MISSING_OID);
 499                 ok = 0;
 500             } else {
 501                 ret->type = ECPKPARAMETERS_TYPE_NAMED;
 502                 ret->value.named_curve = asn1obj;
 503             }
 504         } else
 505             /* we don't know the nid => ERROR */
 506             ok = 0;
 507     } else {
 508         /* use the ECPARAMETERS structure */
 509         ret->type = ECPKPARAMETERS_TYPE_EXPLICIT;
 510         if ((ret->value.parameters =
 511              EC_GROUP_get_ecparameters(group, NULL)) == NULL)
 512             ok = 0;
 513     }
 514
 515     if (!ok) {
 516         ECPKPARAMETERS_free(ret);
 517         return NULL;
 518     }
 519     return ret;
 520 }
 521
 522 EC_GROUP *EC_GROUP_new_from_ecparameters(const ECPARAMETERS *params)
 523 {
 524     int ok = 0, tmp;
 525     EC_GROUP *ret = NULL, *dup = NULL;
 526     BIGNUM *p = NULL, *a = NULL, *b = NULL;
 527     EC_POINT *point = NULL;
 528     long field_bits;
 529     int curve_name = NID_undef;
 530     BN_CTX *ctx = NULL;
 531
 532     if (params->fieldID == NULL
 533             || params->fieldID->fieldType == NULL
 534             || params->fieldID->p.ptr == NULL) {
 535         ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
 536         goto err;
 537     }
 538
 539     /*
 540      * Now extract the curve parameters a and b. Note that, although SEC 1
 541      * specifies the length of their encodings, historical versions of OpenSSL
 542      * encoded them incorrectly, so we must accept any length for backwards
 543      * compatibility.
 544      */
 545     if (params->curve == NULL
 546             || params->curve->a == NULL || params->curve->a->data == NULL
 547             || params->curve->b == NULL || params->curve->b->data == NULL) {
 548         ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
 549         goto err;
 550     }
 551     a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
 552     if (a == NULL) {
 553         ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
 554         goto err;
 555     }
 556     b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
 557     if (b == NULL) {
 558         ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
 559         goto err;
 560     }
 561
 562     /* get the field parameters */
 563     tmp = OBJ_obj2nid(params->fieldID->fieldType);
 564     if (tmp == NID_X9_62_characteristic_two_field)
 565 #ifdef OPENSSL_NO_EC2M
 566     {
 567         ERR_raise(ERR_LIB_EC, EC_R_GF2M_NOT_SUPPORTED);
 568         goto err;
 569     }
 570 #else
 571     {
 572         X9_62_CHARACTERISTIC_TWO *char_two;
 573
 574         char_two = params->fieldID->p.char_two;
 575
 576         field_bits = char_two->m;
 577         if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
 578             ERR_raise(ERR_LIB_EC, EC_R_FIELD_TOO_LARGE);
 579             goto err;
 580         }
 581
 582         if ((p = BN_new()) == NULL) {
 583             ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
 584             goto err;
 585         }
 586
 587         /* get the base type */
 588         tmp = OBJ_obj2nid(char_two->type);
 589
 590         if (tmp == NID_X9_62_tpBasis) {
 591             long tmp_long;
 592
 593             if (!char_two->p.tpBasis) {
 594                 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
 595                 goto err;
 596             }
 597
 598             tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis);
 599
 600             if (!(char_two->m > tmp_long && tmp_long > 0)) {
 601                 ERR_raise(ERR_LIB_EC, EC_R_INVALID_TRINOMIAL_BASIS);
 602                 goto err;
 603             }
 604
 605             /* create the polynomial */
 606             if (!BN_set_bit(p, (int)char_two->m))
 607                 goto err;
 608             if (!BN_set_bit(p, (int)tmp_long))
 609                 goto err;
 610             if (!BN_set_bit(p, 0))
 611                 goto err;
 612         } else if (tmp == NID_X9_62_ppBasis) {
 613             X9_62_PENTANOMIAL *penta;
 614
 615             penta = char_two->p.ppBasis;
 616             if (penta == NULL) {
 617                 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
 618                 goto err;
 619             }
 620
 621             if (!
 622                 (char_two->m > penta->k3 && penta->k3 > penta->k2
 623                  && penta->k2 > penta->k1 && penta->k1 > 0)) {
 624                 ERR_raise(ERR_LIB_EC, EC_R_INVALID_PENTANOMIAL_BASIS);
 625                 goto err;
 626             }
 627
 628             /* create the polynomial */
 629             if (!BN_set_bit(p, (int)char_two->m))
 630                 goto err;
 631             if (!BN_set_bit(p, (int)penta->k1))
 632                 goto err;
 633             if (!BN_set_bit(p, (int)penta->k2))
 634                 goto err;
 635             if (!BN_set_bit(p, (int)penta->k3))
 636                 goto err;
 637             if (!BN_set_bit(p, 0))
 638                 goto err;
 639         } else if (tmp == NID_X9_62_onBasis) {
 640             ERR_raise(ERR_LIB_EC, EC_R_NOT_IMPLEMENTED);
 641             goto err;
 642         } else {                /* error */
 643
 644             ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
 645             goto err;
 646         }
 647
 648         /* create the EC_GROUP structure */
 649         ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
 650     }
 651 #endif
 652     else if (tmp == NID_X9_62_prime_field) {
 653         /* we have a curve over a prime field */
 654         /* extract the prime number */
 655         if (params->fieldID->p.prime == NULL) {
 656             ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
 657             goto err;
 658         }
 659         p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
 660         if (p == NULL) {
 661             ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
 662             goto err;
 663         }
 664
 665         if (BN_is_negative(p) || BN_is_zero(p)) {
 666             ERR_raise(ERR_LIB_EC, EC_R_INVALID_FIELD);
 667             goto err;
 668         }
 669
 670         field_bits = BN_num_bits(p);
 671         if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
 672             ERR_raise(ERR_LIB_EC, EC_R_FIELD_TOO_LARGE);
 673             goto err;
 674         }
 675
 676         /* create the EC_GROUP structure */
 677         ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
 678     } else {
 679         ERR_raise(ERR_LIB_EC, EC_R_INVALID_FIELD);
 680         goto err;
 681     }
 682
 683     if (ret == NULL) {
 684         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 685         goto err;
 686     }
 687
 688     /* extract seed (optional) */
 689     if (params->curve->seed != NULL) {
 690         OPENSSL_free(ret->seed);
 691         if ((ret->seed = OPENSSL_malloc(params->curve->seed->length)) == NULL) {
 692             ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
 693             goto err;
 694         }
 695         memcpy(ret->seed, params->curve->seed->data,
 696                params->curve->seed->length);
 697         ret->seed_len = params->curve->seed->length;
 698     }
 699
 700     if (params->order == NULL
 701             || params->base == NULL
 702             || params->base->data == NULL) {
 703         ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
 704         goto err;
 705     }
 706
 707     if ((point = EC_POINT_new(ret)) == NULL)
 708         goto err;
 709
 710     /* set the point conversion form */
 711     EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
 712                                        (params->base->data[0] & ~0x01));
 713
 714     /* extract the ec point */
 715     if (!EC_POINT_oct2point(ret, point, params->base->data,
 716                             params->base->length, NULL)) {
 717         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 718         goto err;
 719     }
 720
 721     /* extract the order */
 722     if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL) {
 723         ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
 724         goto err;
 725     }
 726     if (BN_is_negative(a) || BN_is_zero(a)) {
 727         ERR_raise(ERR_LIB_EC, EC_R_INVALID_GROUP_ORDER);
 728         goto err;
 729     }
 730     if (BN_num_bits(a) > (int)field_bits + 1) { /* Hasse bound */
 731         ERR_raise(ERR_LIB_EC, EC_R_INVALID_GROUP_ORDER);
 732         goto err;
 733     }
 734
 735     /* extract the cofactor (optional) */
 736     if (params->cofactor == NULL) {
 737         BN_free(b);
 738         b = NULL;
 739     } else if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL) {
 740         ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
 741         goto err;
 742     }
 743     /* set the generator, order and cofactor (if present) */
 744     if (!EC_GROUP_set_generator(ret, point, a, b)) {
 745         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 746         goto err;
 747     }
 748
 749     /*
 750      * Check if the explicit parameters group just created matches one of the
 751      * built-in curves.
 752      *
 753      * We create a copy of the group just built, so that we can remove optional
 754      * fields for the lookup: we do this to avoid the possibility that one of
 755      * the optional parameters is used to force the library into using a less
 756      * performant and less secure EC_METHOD instead of the specialized one.
 757      * In any case, `seed` is not really used in any computation, while a
 758      * cofactor different from the one in the built-in table is just
 759      * mathematically wrong anyway and should not be used.
 760      */
 761     if ((ctx = BN_CTX_new()) == NULL) {
 762         ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
 763         goto err;
 764     }
 765     if ((dup = EC_GROUP_dup(ret)) == NULL
 766             || EC_GROUP_set_seed(dup, NULL, 0) != 1
 767             || !EC_GROUP_set_generator(dup, point, a, NULL)) {
 768         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 769         goto err;
 770     }
 771     if ((curve_name = ossl_ec_curve_nid_from_params(dup, ctx)) != NID_undef) {
 772         /*
 773          * The input explicit parameters successfully matched one of the
 774          * built-in curves: often for built-in curves we have specialized
 775          * methods with better performance and hardening.
 776          *
 777          * In this case we replace the `EC_GROUP` created through explicit
 778          * parameters with one created from a named group.
 779          */
 780         EC_GROUP *named_group = NULL;
 781
 782 #ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
 783         /*
 784          * NID_wap_wsg_idm_ecid_wtls12 and NID_secp224r1 are both aliases for
 785          * the same curve, we prefer the SECP nid when matching explicit
 786          * parameters as that is associated with a specialized EC_METHOD.
 787          */
 788         if (curve_name == NID_wap_wsg_idm_ecid_wtls12)
 789             curve_name = NID_secp224r1;
 790 #endif /* !def(OPENSSL_NO_EC_NISTP_64_GCC_128) */
 791
 792         if ((named_group = EC_GROUP_new_by_curve_name(curve_name)) == NULL) {
 793             ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 794             goto err;
 795         }
 796         EC_GROUP_free(ret);
 797         ret = named_group;
 798
 799         /*
 800          * Set the flag so that EC_GROUPs created from explicit parameters are
 801          * serialized using explicit parameters by default.
 802          */
 803         EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_EXPLICIT_CURVE);
 804
 805         /*
 806          * If the input params do not contain the optional seed field we make
 807          * sure it is not added to the returned group.
 808          *
 809          * The seed field is not really used inside libcrypto anyway, and
 810          * adding it to parsed explicit parameter keys would alter their DER
 811          * encoding output (because of the extra field) which could impact
 812          * applications fingerprinting keys by their DER encoding.
 813          */
 814         if (params->curve->seed == NULL) {
 815             if (EC_GROUP_set_seed(ret, NULL, 0) != 1)
 816                 goto err;
 817         }
 818     }
 819
 820     ok = 1;
 821
 822  err:
 823     if (!ok) {
 824         EC_GROUP_free(ret);
 825         ret = NULL;
 826     }
 827     EC_GROUP_free(dup);
 828
 829     BN_free(p);
 830     BN_free(a);
 831     BN_free(b);
 832     EC_POINT_free(point);
 833
 834     BN_CTX_free(ctx);
 835
 836     return ret;
 837 }
 838
 839 EC_GROUP *EC_GROUP_new_from_ecpkparameters(const ECPKPARAMETERS *params)
 840 {
 841     EC_GROUP *ret = NULL;
 842     int tmp = 0;
 843
 844     if (params == NULL) {
 845         ERR_raise(ERR_LIB_EC, EC_R_MISSING_PARAMETERS);
 846         return NULL;
 847     }
 848
 849     if (params->type == ECPKPARAMETERS_TYPE_NAMED) {
 850         /* the curve is given by an OID */
 851         tmp = OBJ_obj2nid(params->value.named_curve);
 852         if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL) {
 853             ERR_raise(ERR_LIB_EC, EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
 854             return NULL;
 855         }
 856         EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
 857     } else if (params->type == ECPKPARAMETERS_TYPE_EXPLICIT) {
 858         /* the parameters are given by an ECPARAMETERS structure */
 859         ret = EC_GROUP_new_from_ecparameters(params->value.parameters);
 860         if (!ret) {
 861             ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 862             return NULL;
 863         }
 864         EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_EXPLICIT_CURVE);
 865     } else if (params->type == ECPKPARAMETERS_TYPE_IMPLICIT) {
 866         /* implicit parameters inherited from CA - unsupported */
 867         return NULL;
 868     } else {
 869         ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
 870         return NULL;
 871     }
 872
 873     return ret;
 874 }
 875
 876 /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
 877
 878 EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len)
 879 {
 880     EC_GROUP *group = NULL;
 881     ECPKPARAMETERS *params = NULL;
 882     const unsigned char *p = *in;
 883
 884     if ((params = d2i_ECPKPARAMETERS(NULL, &p, len)) == NULL) {
 885         ECPKPARAMETERS_free(params);
 886         return NULL;
 887     }
 888
 889     if ((group = EC_GROUP_new_from_ecpkparameters(params)) == NULL) {
 890         ECPKPARAMETERS_free(params);
 891         return NULL;
 892     }
 893
 894     if (params->type == ECPKPARAMETERS_TYPE_EXPLICIT)
 895         group->decoded_from_explicit_params = 1;
 896
 897     if (a) {
 898         EC_GROUP_free(*a);
 899         *a = group;
 900     }
 901
 902     ECPKPARAMETERS_free(params);
 903     *in = p;
 904     return group;
 905 }
 906
 907 int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out)
 908 {
 909     int ret = 0;
 910     ECPKPARAMETERS *tmp = EC_GROUP_get_ecpkparameters(a, NULL);
 911     if (tmp == NULL) {
 912         ERR_raise(ERR_LIB_EC, EC_R_GROUP2PKPARAMETERS_FAILURE);
 913         return 0;
 914     }
 915     if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) {
 916         ERR_raise(ERR_LIB_EC, EC_R_I2D_ECPKPARAMETERS_FAILURE);
 917         ECPKPARAMETERS_free(tmp);
 918         return 0;
 919     }
 920     ECPKPARAMETERS_free(tmp);
 921     return ret;
 922 }
 923
 924 /* some EC_KEY functions */
 925
 926 EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
 927 {
 928     EC_KEY *ret = NULL;
 929     EC_PRIVATEKEY *priv_key = NULL;
 930     const unsigned char *p = *in;
 931
 932     if ((priv_key = d2i_EC_PRIVATEKEY(NULL, &p, len)) == NULL)
 933         return NULL;
 934
 935     if (a == NULL || *a == NULL) {
 936         if ((ret = EC_KEY_new()) == NULL) {
 937             ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
 938             goto err;
 939         }
 940     } else
 941         ret = *a;
 942
 943     if (priv_key->parameters) {
 944         EC_GROUP_free(ret->group);
 945         ret->group = EC_GROUP_new_from_ecpkparameters(priv_key->parameters);
 946         if (ret->group != NULL
 947             && priv_key->parameters->type == ECPKPARAMETERS_TYPE_EXPLICIT)
 948             ret->group->decoded_from_explicit_params = 1;
 949     }
 950
 951     if (ret->group == NULL) {
 952         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 953         goto err;
 954     }
 955
 956     ret->version = priv_key->version;
 957
 958     if (priv_key->privateKey) {
 959         ASN1_OCTET_STRING *pkey = priv_key->privateKey;
 960         if (EC_KEY_oct2priv(ret, ASN1_STRING_get0_data(pkey),
 961                             ASN1_STRING_length(pkey)) == 0)
 962             goto err;
 963     } else {
 964         ERR_raise(ERR_LIB_EC, EC_R_MISSING_PRIVATE_KEY);
 965         goto err;
 966     }
 967
 968     EC_POINT_clear_free(ret->pub_key);
 969     ret->pub_key = EC_POINT_new(ret->group);
 970     if (ret->pub_key == NULL) {
 971         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 972         goto err;
 973     }
 974
 975     if (priv_key->publicKey) {
 976         const unsigned char *pub_oct;
 977         int pub_oct_len;
 978
 979         pub_oct = ASN1_STRING_get0_data(priv_key->publicKey);
 980         pub_oct_len = ASN1_STRING_length(priv_key->publicKey);
 981         if (!EC_KEY_oct2key(ret, pub_oct, pub_oct_len, NULL)) {
 982             ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 983             goto err;
 984         }
 985     } else {
 986         if (ret->group->meth->keygenpub == NULL
 987             || ret->group->meth->keygenpub(ret) == 0)
 988                 goto err;
 989         /* Remember the original private-key-only encoding. */
 990         ret->enc_flag |= EC_PKEY_NO_PUBKEY;
 991     }
 992
 993     if (a)
 994         *a = ret;
 995     EC_PRIVATEKEY_free(priv_key);
 996     *in = p;
 997     ret->dirty_cnt++;
 998     return ret;
 999
1000  err:
1001     if (a == NULL || *a != ret)
1002         EC_KEY_free(ret);
1003     EC_PRIVATEKEY_free(priv_key);
1004     return NULL;
1005 }
1006
1007 int i2d_ECPrivateKey(const EC_KEY *a, unsigned char **out)
1008 {
1009     int ret = 0, ok = 0;
1010     unsigned char *priv= NULL, *pub= NULL;
1011     size_t privlen = 0, publen = 0;
1012
1013     EC_PRIVATEKEY *priv_key = NULL;
1014
1015     if (a == NULL || a->group == NULL ||
1016         (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key == NULL)) {
1017         ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
1018         goto err;
1019     }
1020
1021     if ((priv_key = EC_PRIVATEKEY_new()) == NULL) {
1022         ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
1023         goto err;
1024     }
1025
1026     priv_key->version = a->version;
1027
1028     privlen = EC_KEY_priv2buf(a, &priv);
1029
1030     if (privlen == 0) {
1031         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1032         goto err;
1033     }
1034
1035     ASN1_STRING_set0(priv_key->privateKey, priv, privlen);
1036     priv = NULL;
1037
1038     if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS)) {
1039         if ((priv_key->parameters =
1040              EC_GROUP_get_ecpkparameters(a->group,
1041                                         priv_key->parameters)) == NULL) {
1042             ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1043             goto err;
1044         }
1045     }
1046
1047     if (!(a->enc_flag & EC_PKEY_NO_PUBKEY)) {
1048         priv_key->publicKey = ASN1_BIT_STRING_new();
1049         if (priv_key->publicKey == NULL) {
1050             ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
1051             goto err;
1052         }
1053
1054         publen = EC_KEY_key2buf(a, a->conv_form, &pub, NULL);
1055
1056         if (publen == 0) {
1057             ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1058             goto err;
1059         }
1060
1061         priv_key->publicKey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
1062         priv_key->publicKey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
1063         ASN1_STRING_set0(priv_key->publicKey, pub, publen);
1064         pub = NULL;
1065     }
1066
1067     if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) {
1068         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1069         goto err;
1070     }
1071     ok = 1;
1072  err:
1073     OPENSSL_clear_free(priv, privlen);
1074     OPENSSL_free(pub);
1075     EC_PRIVATEKEY_free(priv_key);
1076     return (ok ? ret : 0);
1077 }
1078
1079 int i2d_ECParameters(const EC_KEY *a, unsigned char **out)
1080 {
1081     if (a == NULL) {
1082         ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
1083         return 0;
1084     }
1085     return i2d_ECPKParameters(a->group, out);
1086 }
1087
1088 EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len)
1089 {
1090     EC_KEY *ret;
1091
1092     if (in == NULL || *in == NULL) {
1093         ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
1094         return NULL;
1095     }
1096
1097     if (a == NULL || *a == NULL) {
1098         if ((ret = EC_KEY_new()) == NULL) {
1099             ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
1100             return NULL;
1101         }
1102     } else
1103         ret = *a;
1104
1105     if (!d2i_ECPKParameters(&ret->group, in, len)) {
1106         if (a == NULL || *a != ret)
1107              EC_KEY_free(ret);
1108         else
1109             ret->dirty_cnt++;
1110         return NULL;
1111     }
1112     ret->dirty_cnt++;
1113
1114     if (a)
1115         *a = ret;
1116
1117     return ret;
1118 }
1119
1120 EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len)
1121 {
1122     EC_KEY *ret = NULL;
1123
1124     if (a == NULL || (*a) == NULL || (*a)->group == NULL) {
1125         /*
1126          * sorry, but a EC_GROUP-structure is necessary to set the public key
1127          */
1128         ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
1129         return 0;
1130     }
1131     ret = *a;
1132     /* EC_KEY_opt2key updates dirty_cnt */
1133     if (!EC_KEY_oct2key(ret, *in, len, NULL)) {
1134         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1135         return 0;
1136     }
1137     *in += len;
1138     return ret;
1139 }
1140
1141 int i2o_ECPublicKey(const EC_KEY *a, unsigned char **out)
1142 {
1143     size_t buf_len = 0;
1144     int new_buffer = 0;
1145
1146     if (a == NULL) {
1147         ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
1148         return 0;
1149     }
1150
1151     buf_len = EC_POINT_point2oct(a->group, a->pub_key,
1152                                  a->conv_form, NULL, 0, NULL);
1153
1154     if (out == NULL || buf_len == 0)
1155         /* out == NULL => just return the length of the octet string */
1156         return buf_len;
1157
1158     if (*out == NULL) {
1159         if ((*out = OPENSSL_malloc(buf_len)) == NULL) {
1160             ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
1161             return 0;
1162         }
1163         new_buffer = 1;
1164     }
1165     if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form,
1166                             *out, buf_len, NULL)) {
1167         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1168         if (new_buffer) {
1169             OPENSSL_free(*out);
1170             *out = NULL;
1171         }
1172         return 0;
1173     }
1174     if (!new_buffer)
1175         *out += buf_len;
1176     return buf_len;
1177 }
1178
1179 DECLARE_ASN1_FUNCTIONS(ECDSA_SIG)
1180 DECLARE_ASN1_ENCODE_FUNCTIONS_name(ECDSA_SIG, ECDSA_SIG)
1181
1182 #endif /* FIPS_MODULE */
1183
1184 ECDSA_SIG *ECDSA_SIG_new(void)
1185 {
1186     ECDSA_SIG *sig = OPENSSL_zalloc(sizeof(*sig));
1187     if (sig == NULL)
1188         ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
1189     return sig;
1190 }
1191
1192 void ECDSA_SIG_free(ECDSA_SIG *sig)
1193 {
1194     if (sig == NULL)
1195         return;
1196     BN_clear_free(sig->r);
1197     BN_clear_free(sig->s);
1198     OPENSSL_free(sig);
1199 }
1200
1201 ECDSA_SIG *d2i_ECDSA_SIG(ECDSA_SIG **psig, const unsigned char **ppin, long len)
1202 {
1203     ECDSA_SIG *sig;
1204
1205     if (len < 0)
1206         return NULL;
1207     if (psig != NULL && *psig != NULL) {
1208         sig = *psig;
1209     } else {
1210         sig = ECDSA_SIG_new();
1211         if (sig == NULL)
1212             return NULL;
1213     }
1214     if (sig->r == NULL)
1215         sig->r = BN_new();
1216     if (sig->s == NULL)
1217         sig->s = BN_new();
1218     if (ossl_decode_der_dsa_sig(sig->r, sig->s, ppin, (size_t)len) == 0) {
1219         if (psig == NULL || *psig == NULL)
1220             ECDSA_SIG_free(sig);
1221         return NULL;
1222     }
1223     if (psig != NULL && *psig == NULL)
1224         *psig = sig;
1225     return sig;
1226 }
1227
1228 int i2d_ECDSA_SIG(const ECDSA_SIG *sig, unsigned char **ppout)
1229 {
1230     BUF_MEM *buf = NULL;
1231     size_t encoded_len;
1232     WPACKET pkt;
1233
1234     if (ppout == NULL) {
1235         if (!WPACKET_init_null(&pkt, 0))
1236             return -1;
1237     } else if (*ppout == NULL) {
1238         if ((buf = BUF_MEM_new()) == NULL
1239                 || !WPACKET_init_len(&pkt, buf, 0)) {
1240             BUF_MEM_free(buf);
1241             return -1;
1242         }
1243     } else {
1244         if (!WPACKET_init_static_len(&pkt, *ppout, SIZE_MAX, 0))
1245             return -1;
1246     }
1247
1248     if (!encode_der_dsa_sig(&pkt, sig->r, sig->s)
1249             || !WPACKET_get_total_written(&pkt, &encoded_len)
1250             || !WPACKET_finish(&pkt)) {
1251         BUF_MEM_free(buf);
1252         WPACKET_cleanup(&pkt);
1253         return -1;
1254     }
1255
1256     if (ppout != NULL) {
1257         if (*ppout == NULL) {
1258             *ppout = (unsigned char *)buf->data;
1259             buf->data = NULL;
1260             BUF_MEM_free(buf);
1261         } else {
1262             *ppout += encoded_len;
1263         }
1264     }
1265
1266     return (int)encoded_len;
1267 }
1268
1269 void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps)
1270 {
1271     if (pr != NULL)
1272         *pr = sig->r;
1273     if (ps != NULL)
1274         *ps = sig->s;
1275 }
1276
1277 const BIGNUM *ECDSA_SIG_get0_r(const ECDSA_SIG *sig)
1278 {
1279     return sig->r;
1280 }
1281
1282 const BIGNUM *ECDSA_SIG_get0_s(const ECDSA_SIG *sig)
1283 {
1284     return sig->s;
1285 }
1286
1287 int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s)
1288 {
1289     if (r == NULL || s == NULL)
1290         return 0;
1291     BN_clear_free(sig->r);
1292     BN_clear_free(sig->s);
1293     sig->r = r;
1294     sig->s = s;
1295     return 1;
1296 }
1297
1298 int ECDSA_size(const EC_KEY *ec)
1299 {
1300     int ret;
1301     ECDSA_SIG sig;
1302     const EC_GROUP *group;
1303     const BIGNUM *bn;
1304
1305     if (ec == NULL)
1306         return 0;
1307     group = EC_KEY_get0_group(ec);
1308     if (group == NULL)
1309         return 0;
1310
1311     bn = EC_GROUP_get0_order(group);
1312     if (bn == NULL)
1313         return 0;
1314
1315     sig.r = sig.s = (BIGNUM *)bn;
1316     ret = i2d_ECDSA_SIG(&sig, NULL);
1317
1318     if (ret < 0)
1319         ret = 0;
1320     return ret;
1321 }