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         ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
 203         goto err;
 204     }
 205
 206     if (nid == NID_X9_62_prime_field) {
 207         if ((tmp = BN_new()) == NULL) {
 208             ECerr(EC_F_EC_ASN1_GROUP2FIELDID, 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             ECerr(EC_F_EC_ASN1_GROUP2FIELDID, 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             ECerr(EC_F_EC_ASN1_GROUP2FIELDID, 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         ECerr(EC_F_EC_ASN1_GROUP2FIELDID, 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             ECerr(EC_F_EC_ASN1_GROUP2FIELDID, 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             ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
 247             goto err;
 248         }
 249         /* set base type OID */
 250         if ((char_two->type = OBJ_nid2obj(field_type)) == NULL) {
 251             ECerr(EC_F_EC_ASN1_GROUP2FIELDID, 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                 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
 264                 goto err;
 265             }
 266             if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k)) {
 267                 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, 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                 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, 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                 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
 292                 goto err;
 293             }
 294         }
 295     }
 296 #endif
 297     else {
 298         ECerr(EC_F_EC_ASN1_GROUP2FIELDID, 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         ECerr(EC_F_EC_ASN1_GROUP2CURVE, 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         ECerr(EC_F_EC_ASN1_GROUP2CURVE, 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         ECerr(EC_F_EC_ASN1_GROUP2CURVE, 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         ECerr(EC_F_EC_ASN1_GROUP2CURVE, 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         ECerr(EC_F_EC_ASN1_GROUP2CURVE, 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                 ECerr(EC_F_EC_ASN1_GROUP2CURVE, 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             ECerr(EC_F_EC_ASN1_GROUP2CURVE, 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             ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, 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         ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
 408         goto err;
 409     }
 410
 411     /* set the curve */
 412     if (!ec_asn1_group2curve(group, ret->curve)) {
 413         ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
 414         goto err;
 415     }
 416
 417     /* set the base point */
 418     if ((point = EC_GROUP_get0_generator(group)) == NULL) {
 419         ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, 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         ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, 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         ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, 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         ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, 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         ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, 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             ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, 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             ECerr(EC_F_EC_GROUP_GET_ECPKPARAMETERS, 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                 ECerr(EC_F_EC_GROUP_GET_ECPKPARAMETERS, 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         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, 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         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, 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         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, 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         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, 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         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, 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             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_FIELD_TOO_LARGE);
 579             goto err;
 580         }
 581
 582         if ((p = BN_new()) == NULL) {
 583             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, 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                 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, 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                 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS,
 602                       EC_R_INVALID_TRINOMIAL_BASIS);
 603                 goto err;
 604             }
 605
 606             /* create the polynomial */
 607             if (!BN_set_bit(p, (int)char_two->m))
 608                 goto err;
 609             if (!BN_set_bit(p, (int)tmp_long))
 610                 goto err;
 611             if (!BN_set_bit(p, 0))
 612                 goto err;
 613         } else if (tmp == NID_X9_62_ppBasis) {
 614             X9_62_PENTANOMIAL *penta;
 615
 616             penta = char_two->p.ppBasis;
 617             if (penta == NULL) {
 618                 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
 619                 goto err;
 620             }
 621
 622             if (!
 623                 (char_two->m > penta->k3 && penta->k3 > penta->k2
 624                  && penta->k2 > penta->k1 && penta->k1 > 0)) {
 625                 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS,
 626                       EC_R_INVALID_PENTANOMIAL_BASIS);
 627                 goto err;
 628             }
 629
 630             /* create the polynomial */
 631             if (!BN_set_bit(p, (int)char_two->m))
 632                 goto err;
 633             if (!BN_set_bit(p, (int)penta->k1))
 634                 goto err;
 635             if (!BN_set_bit(p, (int)penta->k2))
 636                 goto err;
 637             if (!BN_set_bit(p, (int)penta->k3))
 638                 goto err;
 639             if (!BN_set_bit(p, 0))
 640                 goto err;
 641         } else if (tmp == NID_X9_62_onBasis) {
 642             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_NOT_IMPLEMENTED);
 643             goto err;
 644         } else {                /* error */
 645
 646             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
 647             goto err;
 648         }
 649
 650         /* create the EC_GROUP structure */
 651         ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
 652     }
 653 #endif
 654     else if (tmp == NID_X9_62_prime_field) {
 655         /* we have a curve over a prime field */
 656         /* extract the prime number */
 657         if (params->fieldID->p.prime == NULL) {
 658             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
 659             goto err;
 660         }
 661         p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
 662         if (p == NULL) {
 663             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
 664             goto err;
 665         }
 666
 667         if (BN_is_negative(p) || BN_is_zero(p)) {
 668             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_FIELD);
 669             goto err;
 670         }
 671
 672         field_bits = BN_num_bits(p);
 673         if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
 674             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_FIELD_TOO_LARGE);
 675             goto err;
 676         }
 677
 678         /* create the EC_GROUP structure */
 679         ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
 680     } else {
 681         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_FIELD);
 682         goto err;
 683     }
 684
 685     if (ret == NULL) {
 686         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
 687         goto err;
 688     }
 689
 690     /* extract seed (optional) */
 691     if (params->curve->seed != NULL) {
 692         OPENSSL_free(ret->seed);
 693         if ((ret->seed = OPENSSL_malloc(params->curve->seed->length)) == NULL) {
 694             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
 695             goto err;
 696         }
 697         memcpy(ret->seed, params->curve->seed->data,
 698                params->curve->seed->length);
 699         ret->seed_len = params->curve->seed->length;
 700     }
 701
 702     if (params->order == NULL
 703             || params->base == NULL
 704             || params->base->data == NULL) {
 705         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
 706         goto err;
 707     }
 708
 709     if ((point = EC_POINT_new(ret)) == NULL)
 710         goto err;
 711
 712     /* set the point conversion form */
 713     EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
 714                                        (params->base->data[0] & ~0x01));
 715
 716     /* extract the ec point */
 717     if (!EC_POINT_oct2point(ret, point, params->base->data,
 718                             params->base->length, NULL)) {
 719         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
 720         goto err;
 721     }
 722
 723     /* extract the order */
 724     if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL) {
 725         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
 726         goto err;
 727     }
 728     if (BN_is_negative(a) || BN_is_zero(a)) {
 729         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_GROUP_ORDER);
 730         goto err;
 731     }
 732     if (BN_num_bits(a) > (int)field_bits + 1) { /* Hasse bound */
 733         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_GROUP_ORDER);
 734         goto err;
 735     }
 736
 737     /* extract the cofactor (optional) */
 738     if (params->cofactor == NULL) {
 739         BN_free(b);
 740         b = NULL;
 741     } else if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL) {
 742         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
 743         goto err;
 744     }
 745     /* set the generator, order and cofactor (if present) */
 746     if (!EC_GROUP_set_generator(ret, point, a, b)) {
 747         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
 748         goto err;
 749     }
 750
 751     /*
 752      * Check if the explicit parameters group just created matches one of the
 753      * built-in curves.
 754      *
 755      * We create a copy of the group just built, so that we can remove optional
 756      * fields for the lookup: we do this to avoid the possibility that one of
 757      * the optional parameters is used to force the library into using a less
 758      * performant and less secure EC_METHOD instead of the specialized one.
 759      * In any case, `seed` is not really used in any computation, while a
 760      * cofactor different from the one in the built-in table is just
 761      * mathematically wrong anyway and should not be used.
 762      */
 763     if ((ctx = BN_CTX_new()) == NULL) {
 764         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB);
 765         goto err;
 766     }
 767     if ((dup = EC_GROUP_dup(ret)) == NULL
 768             || EC_GROUP_set_seed(dup, NULL, 0) != 1
 769             || !EC_GROUP_set_generator(dup, point, a, NULL)) {
 770         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
 771         goto err;
 772     }
 773     if ((curve_name = ec_curve_nid_from_params(dup, ctx)) != NID_undef) {
 774         /*
 775          * The input explicit parameters successfully matched one of the
 776          * built-in curves: often for built-in curves we have specialized
 777          * methods with better performance and hardening.
 778          *
 779          * In this case we replace the `EC_GROUP` created through explicit
 780          * parameters with one created from a named group.
 781          */
 782         EC_GROUP *named_group = NULL;
 783
 784 #ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
 785         /*
 786          * NID_wap_wsg_idm_ecid_wtls12 and NID_secp224r1 are both aliases for
 787          * the same curve, we prefer the SECP nid when matching explicit
 788          * parameters as that is associated with a specialized EC_METHOD.
 789          */
 790         if (curve_name == NID_wap_wsg_idm_ecid_wtls12)
 791             curve_name = NID_secp224r1;
 792 #endif /* !def(OPENSSL_NO_EC_NISTP_64_GCC_128) */
 793
 794         if ((named_group = EC_GROUP_new_by_curve_name(curve_name)) == NULL) {
 795             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
 796             goto err;
 797         }
 798         EC_GROUP_free(ret);
 799         ret = named_group;
 800
 801         /*
 802          * Set the flag so that EC_GROUPs created from explicit parameters are
 803          * serialized using explicit parameters by default.
 804          */
 805         EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_EXPLICIT_CURVE);
 806
 807         /*
 808          * If the input params do not contain the optional seed field we make
 809          * sure it is not added to the returned group.
 810          *
 811          * The seed field is not really used inside libcrypto anyway, and
 812          * adding it to parsed explicit parameter keys would alter their DER
 813          * encoding output (because of the extra field) which could impact
 814          * applications fingerprinting keys by their DER encoding.
 815          */
 816         if (params->curve->seed == NULL) {
 817             if (EC_GROUP_set_seed(ret, NULL, 0) != 1)
 818                 goto err;
 819         }
 820     }
 821
 822     ok = 1;
 823
 824  err:
 825     if (!ok) {
 826         EC_GROUP_free(ret);
 827         ret = NULL;
 828     }
 829     EC_GROUP_free(dup);
 830
 831     BN_free(p);
 832     BN_free(a);
 833     BN_free(b);
 834     EC_POINT_free(point);
 835
 836     BN_CTX_free(ctx);
 837
 838     return ret;
 839 }
 840
 841 EC_GROUP *EC_GROUP_new_from_ecpkparameters(const ECPKPARAMETERS *params)
 842 {
 843     EC_GROUP *ret = NULL;
 844     int tmp = 0;
 845
 846     if (params == NULL) {
 847         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, EC_R_MISSING_PARAMETERS);
 848         return NULL;
 849     }
 850
 851     if (params->type == ECPKPARAMETERS_TYPE_NAMED) {
 852         /* the curve is given by an OID */
 853         tmp = OBJ_obj2nid(params->value.named_curve);
 854         if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL) {
 855             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS,
 856                   EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
 857             return NULL;
 858         }
 859         EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
 860     } else if (params->type == ECPKPARAMETERS_TYPE_EXPLICIT) {
 861         /* the parameters are given by an ECPARAMETERS structure */
 862         ret = EC_GROUP_new_from_ecparameters(params->value.parameters);
 863         if (!ret) {
 864             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, ERR_R_EC_LIB);
 865             return NULL;
 866         }
 867         EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_EXPLICIT_CURVE);
 868     } else if (params->type == ECPKPARAMETERS_TYPE_IMPLICIT) {
 869         /* implicit parameters inherited from CA - unsupported */
 870         return NULL;
 871     } else {
 872         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, EC_R_ASN1_ERROR);
 873         return NULL;
 874     }
 875
 876     return ret;
 877 }
 878
 879 /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
 880
 881 EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len)
 882 {
 883     EC_GROUP *group = NULL;
 884     ECPKPARAMETERS *params = NULL;
 885     const unsigned char *p = *in;
 886
 887     if ((params = d2i_ECPKPARAMETERS(NULL, &p, len)) == NULL) {
 888         ECPKPARAMETERS_free(params);
 889         return NULL;
 890     }
 891
 892     if ((group = EC_GROUP_new_from_ecpkparameters(params)) == NULL) {
 893         ECPKPARAMETERS_free(params);
 894         return NULL;
 895     }
 896
 897     if (params->type == ECPKPARAMETERS_TYPE_EXPLICIT)
 898         group->decoded_from_explicit_params = 1;
 899
 900     if (a) {
 901         EC_GROUP_free(*a);
 902         *a = group;
 903     }
 904
 905     ECPKPARAMETERS_free(params);
 906     *in = p;
 907     return group;
 908 }
 909
 910 int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out)
 911 {
 912     int ret = 0;
 913     ECPKPARAMETERS *tmp = EC_GROUP_get_ecpkparameters(a, NULL);
 914     if (tmp == NULL) {
 915         ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_GROUP2PKPARAMETERS_FAILURE);
 916         return 0;
 917     }
 918     if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) {
 919         ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_I2D_ECPKPARAMETERS_FAILURE);
 920         ECPKPARAMETERS_free(tmp);
 921         return 0;
 922     }
 923     ECPKPARAMETERS_free(tmp);
 924     return ret;
 925 }
 926
 927 /* some EC_KEY functions */
 928
 929 EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
 930 {
 931     EC_KEY *ret = NULL;
 932     EC_PRIVATEKEY *priv_key = NULL;
 933     const unsigned char *p = *in;
 934
 935     if ((priv_key = d2i_EC_PRIVATEKEY(NULL, &p, len)) == NULL)
 936         return NULL;
 937
 938     if (a == NULL || *a == NULL) {
 939         if ((ret = EC_KEY_new()) == NULL) {
 940             ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
 941             goto err;
 942         }
 943     } else
 944         ret = *a;
 945
 946     if (priv_key->parameters) {
 947         EC_GROUP_free(ret->group);
 948         ret->group = EC_GROUP_new_from_ecpkparameters(priv_key->parameters);
 949         if (ret->group != NULL
 950             && priv_key->parameters->type == ECPKPARAMETERS_TYPE_EXPLICIT)
 951             ret->group->decoded_from_explicit_params = 1;
 952     }
 953
 954     if (ret->group == NULL) {
 955         ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
 956         goto err;
 957     }
 958
 959     ret->version = priv_key->version;
 960
 961     if (priv_key->privateKey) {
 962         ASN1_OCTET_STRING *pkey = priv_key->privateKey;
 963         if (EC_KEY_oct2priv(ret, ASN1_STRING_get0_data(pkey),
 964                             ASN1_STRING_length(pkey)) == 0)
 965             goto err;
 966     } else {
 967         ECerr(EC_F_D2I_ECPRIVATEKEY, EC_R_MISSING_PRIVATE_KEY);
 968         goto err;
 969     }
 970
 971     EC_POINT_clear_free(ret->pub_key);
 972     ret->pub_key = EC_POINT_new(ret->group);
 973     if (ret->pub_key == NULL) {
 974         ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
 975         goto err;
 976     }
 977
 978     if (priv_key->publicKey) {
 979         const unsigned char *pub_oct;
 980         int pub_oct_len;
 981
 982         pub_oct = ASN1_STRING_get0_data(priv_key->publicKey);
 983         pub_oct_len = ASN1_STRING_length(priv_key->publicKey);
 984         if (!EC_KEY_oct2key(ret, pub_oct, pub_oct_len, NULL)) {
 985             ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
 986             goto err;
 987         }
 988     } else {
 989         if (ret->group->meth->keygenpub == NULL
 990             || ret->group->meth->keygenpub(ret) == 0)
 991                 goto err;
 992         /* Remember the original private-key-only encoding. */
 993         ret->enc_flag |= EC_PKEY_NO_PUBKEY;
 994     }
 995
 996     if (a)
 997         *a = ret;
 998     EC_PRIVATEKEY_free(priv_key);
 999     *in = p;
1000     ret->dirty_cnt++;
1001     return ret;
1002
1003  err:
1004     if (a == NULL || *a != ret)
1005         EC_KEY_free(ret);
1006     EC_PRIVATEKEY_free(priv_key);
1007     return NULL;
1008 }
1009
1010 int i2d_ECPrivateKey(const EC_KEY *a, unsigned char **out)
1011 {
1012     int ret = 0, ok = 0;
1013     unsigned char *priv= NULL, *pub= NULL;
1014     size_t privlen = 0, publen = 0;
1015
1016     EC_PRIVATEKEY *priv_key = NULL;
1017
1018     if (a == NULL || a->group == NULL ||
1019         (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key == NULL)) {
1020         ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_PASSED_NULL_PARAMETER);
1021         goto err;
1022     }
1023
1024     if ((priv_key = EC_PRIVATEKEY_new()) == NULL) {
1025         ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1026         goto err;
1027     }
1028
1029     priv_key->version = a->version;
1030
1031     privlen = EC_KEY_priv2buf(a, &priv);
1032
1033     if (privlen == 0) {
1034         ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1035         goto err;
1036     }
1037
1038     ASN1_STRING_set0(priv_key->privateKey, priv, privlen);
1039     priv = NULL;
1040
1041     if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS)) {
1042         if ((priv_key->parameters =
1043              EC_GROUP_get_ecpkparameters(a->group,
1044                                         priv_key->parameters)) == NULL) {
1045             ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1046             goto err;
1047         }
1048     }
1049
1050     if (!(a->enc_flag & EC_PKEY_NO_PUBKEY)) {
1051         priv_key->publicKey = ASN1_BIT_STRING_new();
1052         if (priv_key->publicKey == NULL) {
1053             ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1054             goto err;
1055         }
1056
1057         publen = EC_KEY_key2buf(a, a->conv_form, &pub, NULL);
1058
1059         if (publen == 0) {
1060             ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1061             goto err;
1062         }
1063
1064         priv_key->publicKey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
1065         priv_key->publicKey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
1066         ASN1_STRING_set0(priv_key->publicKey, pub, publen);
1067         pub = NULL;
1068     }
1069
1070     if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) {
1071         ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1072         goto err;
1073     }
1074     ok = 1;
1075  err:
1076     OPENSSL_clear_free(priv, privlen);
1077     OPENSSL_free(pub);
1078     EC_PRIVATEKEY_free(priv_key);
1079     return (ok ? ret : 0);
1080 }
1081
1082 int i2d_ECParameters(const EC_KEY *a, unsigned char **out)
1083 {
1084     if (a == NULL) {
1085         ECerr(EC_F_I2D_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1086         return 0;
1087     }
1088     return i2d_ECPKParameters(a->group, out);
1089 }
1090
1091 EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len)
1092 {
1093     EC_KEY *ret;
1094
1095     if (in == NULL || *in == NULL) {
1096         ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1097         return NULL;
1098     }
1099
1100     if (a == NULL || *a == NULL) {
1101         if ((ret = EC_KEY_new()) == NULL) {
1102             ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
1103             return NULL;
1104         }
1105     } else
1106         ret = *a;
1107
1108     if (!d2i_ECPKParameters(&ret->group, in, len)) {
1109         if (a == NULL || *a != ret)
1110              EC_KEY_free(ret);
1111         else
1112             ret->dirty_cnt++;
1113         return NULL;
1114     }
1115     ret->dirty_cnt++;
1116
1117     if (a)
1118         *a = ret;
1119
1120     return ret;
1121 }
1122
1123 EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len)
1124 {
1125     EC_KEY *ret = NULL;
1126
1127     if (a == NULL || (*a) == NULL || (*a)->group == NULL) {
1128         /*
1129          * sorry, but a EC_GROUP-structure is necessary to set the public key
1130          */
1131         ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1132         return 0;
1133     }
1134     ret = *a;
1135     /* EC_KEY_opt2key updates dirty_cnt */
1136     if (!EC_KEY_oct2key(ret, *in, len, NULL)) {
1137         ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_EC_LIB);
1138         return 0;
1139     }
1140     *in += len;
1141     return ret;
1142 }
1143
1144 int i2o_ECPublicKey(const EC_KEY *a, unsigned char **out)
1145 {
1146     size_t buf_len = 0;
1147     int new_buffer = 0;
1148
1149     if (a == NULL) {
1150         ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1151         return 0;
1152     }
1153
1154     buf_len = EC_POINT_point2oct(a->group, a->pub_key,
1155                                  a->conv_form, NULL, 0, NULL);
1156
1157     if (out == NULL || buf_len == 0)
1158         /* out == NULL => just return the length of the octet string */
1159         return buf_len;
1160
1161     if (*out == NULL) {
1162         if ((*out = OPENSSL_malloc(buf_len)) == NULL) {
1163             ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
1164             return 0;
1165         }
1166         new_buffer = 1;
1167     }
1168     if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form,
1169                             *out, buf_len, NULL)) {
1170         ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_EC_LIB);
1171         if (new_buffer) {
1172             OPENSSL_free(*out);
1173             *out = NULL;
1174         }
1175         return 0;
1176     }
1177     if (!new_buffer)
1178         *out += buf_len;
1179     return buf_len;
1180 }
1181
1182 DECLARE_ASN1_FUNCTIONS(ECDSA_SIG)
1183 DECLARE_ASN1_ENCODE_FUNCTIONS_name(ECDSA_SIG, ECDSA_SIG)
1184
1185 #endif /* FIPS_MODULE */
1186
1187 ECDSA_SIG *ECDSA_SIG_new(void)
1188 {
1189     ECDSA_SIG *sig = OPENSSL_zalloc(sizeof(*sig));
1190     if (sig == NULL)
1191         ECerr(EC_F_ECDSA_SIG_NEW, ERR_R_MALLOC_FAILURE);
1192     return sig;
1193 }
1194
1195 void ECDSA_SIG_free(ECDSA_SIG *sig)
1196 {
1197     if (sig == NULL)
1198         return;
1199     BN_clear_free(sig->r);
1200     BN_clear_free(sig->s);
1201     OPENSSL_free(sig);
1202 }
1203
1204 ECDSA_SIG *d2i_ECDSA_SIG(ECDSA_SIG **psig, const unsigned char **ppin, long len)
1205 {
1206     ECDSA_SIG *sig;
1207
1208     if (len < 0)
1209         return NULL;
1210     if (psig != NULL && *psig != NULL) {
1211         sig = *psig;
1212     } else {
1213         sig = ECDSA_SIG_new();
1214         if (sig == NULL)
1215             return NULL;
1216     }
1217     if (sig->r == NULL)
1218         sig->r = BN_new();
1219     if (sig->s == NULL)
1220         sig->s = BN_new();
1221     if (decode_der_dsa_sig(sig->r, sig->s, ppin, (size_t)len) == 0) {
1222         if (psig == NULL || *psig == NULL)
1223             ECDSA_SIG_free(sig);
1224         return NULL;
1225     }
1226     if (psig != NULL && *psig == NULL)
1227         *psig = sig;
1228     return sig;
1229 }
1230
1231 int i2d_ECDSA_SIG(const ECDSA_SIG *sig, unsigned char **ppout)
1232 {
1233     BUF_MEM *buf = NULL;
1234     size_t encoded_len;
1235     WPACKET pkt;
1236
1237     if (ppout == NULL) {
1238         if (!WPACKET_init_null(&pkt, 0))
1239             return -1;
1240     } else if (*ppout == NULL) {
1241         if ((buf = BUF_MEM_new()) == NULL
1242                 || !WPACKET_init_len(&pkt, buf, 0)) {
1243             BUF_MEM_free(buf);
1244             return -1;
1245         }
1246     } else {
1247         if (!WPACKET_init_static_len(&pkt, *ppout, SIZE_MAX, 0))
1248             return -1;
1249     }
1250
1251     if (!encode_der_dsa_sig(&pkt, sig->r, sig->s)
1252             || !WPACKET_get_total_written(&pkt, &encoded_len)
1253             || !WPACKET_finish(&pkt)) {
1254         BUF_MEM_free(buf);
1255         WPACKET_cleanup(&pkt);
1256         return -1;
1257     }
1258
1259     if (ppout != NULL) {
1260         if (*ppout == NULL) {
1261             *ppout = (unsigned char *)buf->data;
1262             buf->data = NULL;
1263             BUF_MEM_free(buf);
1264         } else {
1265             *ppout += encoded_len;
1266         }
1267     }
1268
1269     return (int)encoded_len;
1270 }
1271
1272 void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps)
1273 {
1274     if (pr != NULL)
1275         *pr = sig->r;
1276     if (ps != NULL)
1277         *ps = sig->s;
1278 }
1279
1280 const BIGNUM *ECDSA_SIG_get0_r(const ECDSA_SIG *sig)
1281 {
1282     return sig->r;
1283 }
1284
1285 const BIGNUM *ECDSA_SIG_get0_s(const ECDSA_SIG *sig)
1286 {
1287     return sig->s;
1288 }
1289
1290 int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s)
1291 {
1292     if (r == NULL || s == NULL)
1293         return 0;
1294     BN_clear_free(sig->r);
1295     BN_clear_free(sig->s);
1296     sig->r = r;
1297     sig->s = s;
1298     return 1;
1299 }
1300
1301 int ECDSA_size(const EC_KEY *ec)
1302 {
1303     int ret;
1304     ECDSA_SIG sig;
1305     const EC_GROUP *group;
1306     const BIGNUM *bn;
1307
1308     if (ec == NULL)
1309         return 0;
1310     group = EC_KEY_get0_group(ec);
1311     if (group == NULL)
1312         return 0;
1313
1314     bn = EC_GROUP_get0_order(group);
1315     if (bn == NULL)
1316         return 0;
1317
1318     sig.r = sig.s = (BIGNUM *)bn;
1319     ret = i2d_ECDSA_SIG(&sig, NULL);
1320
1321     if (ret < 0)
1322         ret = 0;
1323     return ret;
1324 }