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_lcl.h"
  12 #include <openssl/err.h>
  13 #include <openssl/asn1t.h>
  14 #include <openssl/objects.h>
  15 #include "internal/nelem.h"
  16 #include "internal/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
 453     if (params == NULL) {
 454         if ((ret = ECPARAMETERS_new()) == NULL) {
 455             ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
 456             goto err;
 457         }
 458     } else
 459         ret = params;
 460
 461     /* set the version (always one) */
 462     ret->version = (long)0x1;
 463
 464     /* set the fieldID */
 465     if (!ec_asn1_group2fieldid(group, ret->fieldID)) {
 466         ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
 467         goto err;
 468     }
 469
 470     /* set the curve */
 471     if (!ec_asn1_group2curve(group, ret->curve)) {
 472         ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
 473         goto err;
 474     }
 475
 476     /* set the base point */
 477     if ((point = EC_GROUP_get0_generator(group)) == NULL) {
 478         ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, EC_R_UNDEFINED_GENERATOR);
 479         goto err;
 480     }
 481
 482     form = EC_GROUP_get_point_conversion_form(group);
 483
 484     len = EC_POINT_point2buf(group, point, form, &buffer, NULL);
 485     if (len == 0) {
 486         ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
 487         goto err;
 488     }
 489     if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) {
 490         OPENSSL_free(buffer);
 491         ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
 492         goto err;
 493     }
 494     ASN1_STRING_set0(ret->base, buffer, len);
 495
 496     /* set the order */
 497     tmp = EC_GROUP_get0_order(group);
 498     if (tmp == NULL) {
 499         ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
 500         goto err;
 501     }
 502     ret->order = BN_to_ASN1_INTEGER(tmp, ret->order);
 503     if (ret->order == NULL) {
 504         ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_ASN1_LIB);
 505         goto err;
 506     }
 507
 508     /* set the cofactor (optional) */
 509     tmp = EC_GROUP_get0_cofactor(group);
 510     if (tmp != NULL) {
 511         ret->cofactor = BN_to_ASN1_INTEGER(tmp, ret->cofactor);
 512         if (ret->cofactor == NULL) {
 513             ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_ASN1_LIB);
 514             goto err;
 515         }
 516     }
 517
 518     return ret;
 519
 520  err:
 521     if (params == NULL)
 522         ECPARAMETERS_free(ret);
 523     return NULL;
 524 }
 525
 526 ECPKPARAMETERS *EC_GROUP_get_ecpkparameters(const EC_GROUP *group,
 527                                             ECPKPARAMETERS *params)
 528 {
 529     int ok = 1, tmp;
 530     ECPKPARAMETERS *ret = params;
 531
 532     if (ret == NULL) {
 533         if ((ret = ECPKPARAMETERS_new()) == NULL) {
 534             ECerr(EC_F_EC_GROUP_GET_ECPKPARAMETERS, ERR_R_MALLOC_FAILURE);
 535             return NULL;
 536         }
 537     } else {
 538         if (ret->type == 0)
 539             ASN1_OBJECT_free(ret->value.named_curve);
 540         else if (ret->type == 1 && ret->value.parameters)
 541             ECPARAMETERS_free(ret->value.parameters);
 542     }
 543
 544     if (EC_GROUP_get_asn1_flag(group)) {
 545         /*
 546          * use the asn1 OID to describe the elliptic curve parameters
 547          */
 548         tmp = EC_GROUP_get_curve_name(group);
 549         if (tmp) {
 550             ret->type = 0;
 551             if ((ret->value.named_curve = OBJ_nid2obj(tmp)) == NULL)
 552                 ok = 0;
 553         } else
 554             /* we don't know the nid => ERROR */
 555             ok = 0;
 556     } else {
 557         /* use the ECPARAMETERS structure */
 558         ret->type = 1;
 559         if ((ret->value.parameters =
 560              EC_GROUP_get_ecparameters(group, NULL)) == NULL)
 561             ok = 0;
 562     }
 563
 564     if (!ok) {
 565         ECPKPARAMETERS_free(ret);
 566         return NULL;
 567     }
 568     return ret;
 569 }
 570
 571 EC_GROUP *EC_GROUP_new_from_ecparameters(const ECPARAMETERS *params)
 572 {
 573     int ok = 0, tmp;
 574     EC_GROUP *ret = NULL;
 575     BIGNUM *p = NULL, *a = NULL, *b = NULL;
 576     EC_POINT *point = NULL;
 577     long field_bits;
 578
 579     if (!params->fieldID || !params->fieldID->fieldType ||
 580         !params->fieldID->p.ptr) {
 581         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
 582         goto err;
 583     }
 584
 585     /*
 586      * Now extract the curve parameters a and b. Note that, although SEC 1
 587      * specifies the length of their encodings, historical versions of OpenSSL
 588      * encoded them incorrectly, so we must accept any length for backwards
 589      * compatibility.
 590      */
 591     if (!params->curve || !params->curve->a ||
 592         !params->curve->a->data || !params->curve->b ||
 593         !params->curve->b->data) {
 594         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
 595         goto err;
 596     }
 597     a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
 598     if (a == NULL) {
 599         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB);
 600         goto err;
 601     }
 602     b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
 603     if (b == NULL) {
 604         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB);
 605         goto err;
 606     }
 607
 608     /* get the field parameters */
 609     tmp = OBJ_obj2nid(params->fieldID->fieldType);
 610     if (tmp == NID_X9_62_characteristic_two_field)
 611 #ifdef OPENSSL_NO_EC2M
 612     {
 613         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_GF2M_NOT_SUPPORTED);
 614         goto err;
 615     }
 616 #else
 617     {
 618         X9_62_CHARACTERISTIC_TWO *char_two;
 619
 620         char_two = params->fieldID->p.char_two;
 621
 622         field_bits = char_two->m;
 623         if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
 624             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_FIELD_TOO_LARGE);
 625             goto err;
 626         }
 627
 628         if ((p = BN_new()) == NULL) {
 629             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
 630             goto err;
 631         }
 632
 633         /* get the base type */
 634         tmp = OBJ_obj2nid(char_two->type);
 635
 636         if (tmp == NID_X9_62_tpBasis) {
 637             long tmp_long;
 638
 639             if (!char_two->p.tpBasis) {
 640                 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
 641                 goto err;
 642             }
 643
 644             tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis);
 645
 646             if (!(char_two->m > tmp_long && tmp_long > 0)) {
 647                 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS,
 648                       EC_R_INVALID_TRINOMIAL_BASIS);
 649                 goto err;
 650             }
 651
 652             /* create the polynomial */
 653             if (!BN_set_bit(p, (int)char_two->m))
 654                 goto err;
 655             if (!BN_set_bit(p, (int)tmp_long))
 656                 goto err;
 657             if (!BN_set_bit(p, 0))
 658                 goto err;
 659         } else if (tmp == NID_X9_62_ppBasis) {
 660             X9_62_PENTANOMIAL *penta;
 661
 662             penta = char_two->p.ppBasis;
 663             if (!penta) {
 664                 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
 665                 goto err;
 666             }
 667
 668             if (!
 669                 (char_two->m > penta->k3 && penta->k3 > penta->k2
 670                  && penta->k2 > penta->k1 && penta->k1 > 0)) {
 671                 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS,
 672                       EC_R_INVALID_PENTANOMIAL_BASIS);
 673                 goto err;
 674             }
 675
 676             /* create the polynomial */
 677             if (!BN_set_bit(p, (int)char_two->m))
 678                 goto err;
 679             if (!BN_set_bit(p, (int)penta->k1))
 680                 goto err;
 681             if (!BN_set_bit(p, (int)penta->k2))
 682                 goto err;
 683             if (!BN_set_bit(p, (int)penta->k3))
 684                 goto err;
 685             if (!BN_set_bit(p, 0))
 686                 goto err;
 687         } else if (tmp == NID_X9_62_onBasis) {
 688             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_NOT_IMPLEMENTED);
 689             goto err;
 690         } else {                /* error */
 691
 692             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
 693             goto err;
 694         }
 695
 696         /* create the EC_GROUP structure */
 697         ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
 698     }
 699 #endif
 700     else if (tmp == NID_X9_62_prime_field) {
 701         /* we have a curve over a prime field */
 702         /* extract the prime number */
 703         if (!params->fieldID->p.prime) {
 704             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
 705             goto err;
 706         }
 707         p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
 708         if (p == NULL) {
 709             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
 710             goto err;
 711         }
 712
 713         if (BN_is_negative(p) || BN_is_zero(p)) {
 714             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_FIELD);
 715             goto err;
 716         }
 717
 718         field_bits = BN_num_bits(p);
 719         if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
 720             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_FIELD_TOO_LARGE);
 721             goto err;
 722         }
 723
 724         /* create the EC_GROUP structure */
 725         ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
 726     } else {
 727         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_FIELD);
 728         goto err;
 729     }
 730
 731     if (ret == NULL) {
 732         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
 733         goto err;
 734     }
 735
 736     /* extract seed (optional) */
 737     if (params->curve->seed != NULL) {
 738         OPENSSL_free(ret->seed);
 739         if ((ret->seed = OPENSSL_malloc(params->curve->seed->length)) == NULL) {
 740             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
 741             goto err;
 742         }
 743         memcpy(ret->seed, params->curve->seed->data,
 744                params->curve->seed->length);
 745         ret->seed_len = params->curve->seed->length;
 746     }
 747
 748     if (!params->order || !params->base || !params->base->data) {
 749         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
 750         goto err;
 751     }
 752
 753     if ((point = EC_POINT_new(ret)) == NULL)
 754         goto err;
 755
 756     /* set the point conversion form */
 757     EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
 758                                        (params->base->data[0] & ~0x01));
 759
 760     /* extract the ec point */
 761     if (!EC_POINT_oct2point(ret, point, params->base->data,
 762                             params->base->length, NULL)) {
 763         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
 764         goto err;
 765     }
 766
 767     /* extract the order */
 768     if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL) {
 769         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
 770         goto err;
 771     }
 772     if (BN_is_negative(a) || BN_is_zero(a)) {
 773         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_GROUP_ORDER);
 774         goto err;
 775     }
 776     if (BN_num_bits(a) > (int)field_bits + 1) { /* Hasse bound */
 777         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_GROUP_ORDER);
 778         goto err;
 779     }
 780
 781     /* extract the cofactor (optional) */
 782     if (params->cofactor == NULL) {
 783         BN_free(b);
 784         b = NULL;
 785     } else if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL) {
 786         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
 787         goto err;
 788     }
 789     /* set the generator, order and cofactor (if present) */
 790     if (!EC_GROUP_set_generator(ret, point, a, b)) {
 791         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
 792         goto err;
 793     }
 794
 795     ok = 1;
 796
 797  err:
 798     if (!ok) {
 799         EC_GROUP_clear_free(ret);
 800         ret = NULL;
 801     }
 802
 803     BN_free(p);
 804     BN_free(a);
 805     BN_free(b);
 806     EC_POINT_free(point);
 807     return ret;
 808 }
 809
 810 EC_GROUP *EC_GROUP_new_from_ecpkparameters(const ECPKPARAMETERS *params)
 811 {
 812     EC_GROUP *ret = NULL;
 813     int tmp = 0;
 814
 815     if (params == NULL) {
 816         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, EC_R_MISSING_PARAMETERS);
 817         return NULL;
 818     }
 819
 820     if (params->type == 0) {    /* the curve is given by an OID */
 821         tmp = OBJ_obj2nid(params->value.named_curve);
 822         if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL) {
 823             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS,
 824                   EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
 825             return NULL;
 826         }
 827         EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
 828     } else if (params->type == 1) { /* the parameters are given by a
 829                                      * ECPARAMETERS structure */
 830         ret = EC_GROUP_new_from_ecparameters(params->value.parameters);
 831         if (!ret) {
 832             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, ERR_R_EC_LIB);
 833             return NULL;
 834         }
 835         EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_EXPLICIT_CURVE);
 836     } else if (params->type == 2) { /* implicitlyCA */
 837         return NULL;
 838     } else {
 839         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, EC_R_ASN1_ERROR);
 840         return NULL;
 841     }
 842
 843     return ret;
 844 }
 845
 846 /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
 847
 848 EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len)
 849 {
 850     EC_GROUP *group = NULL;
 851     ECPKPARAMETERS *params = NULL;
 852     const unsigned char *p = *in;
 853
 854     if ((params = d2i_ECPKPARAMETERS(NULL, &p, len)) == NULL) {
 855         ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_D2I_ECPKPARAMETERS_FAILURE);
 856         ECPKPARAMETERS_free(params);
 857         return NULL;
 858     }
 859
 860     if ((group = EC_GROUP_new_from_ecpkparameters(params)) == NULL) {
 861         ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_PKPARAMETERS2GROUP_FAILURE);
 862         ECPKPARAMETERS_free(params);
 863         return NULL;
 864     }
 865
 866     if (a) {
 867         EC_GROUP_clear_free(*a);
 868         *a = group;
 869     }
 870
 871     ECPKPARAMETERS_free(params);
 872     *in = p;
 873     return group;
 874 }
 875
 876 int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out)
 877 {
 878     int ret = 0;
 879     ECPKPARAMETERS *tmp = EC_GROUP_get_ecpkparameters(a, NULL);
 880     if (tmp == NULL) {
 881         ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_GROUP2PKPARAMETERS_FAILURE);
 882         return 0;
 883     }
 884     if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) {
 885         ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_I2D_ECPKPARAMETERS_FAILURE);
 886         ECPKPARAMETERS_free(tmp);
 887         return 0;
 888     }
 889     ECPKPARAMETERS_free(tmp);
 890     return ret;
 891 }
 892
 893 /* some EC_KEY functions */
 894
 895 EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
 896 {
 897     EC_KEY *ret = NULL;
 898     EC_PRIVATEKEY *priv_key = NULL;
 899     const unsigned char *p = *in;
 900
 901     if ((priv_key = d2i_EC_PRIVATEKEY(NULL, &p, len)) == NULL) {
 902         ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
 903         return NULL;
 904     }
 905
 906     if (a == NULL || *a == NULL) {
 907         if ((ret = EC_KEY_new()) == NULL) {
 908             ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
 909             goto err;
 910         }
 911     } else
 912         ret = *a;
 913
 914     if (priv_key->parameters) {
 915         EC_GROUP_clear_free(ret->group);
 916         ret->group = EC_GROUP_new_from_ecpkparameters(priv_key->parameters);
 917     }
 918
 919     if (ret->group == NULL) {
 920         ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
 921         goto err;
 922     }
 923
 924     ret->version = priv_key->version;
 925
 926     if (priv_key->privateKey) {
 927         ASN1_OCTET_STRING *pkey = priv_key->privateKey;
 928         if (EC_KEY_oct2priv(ret, ASN1_STRING_get0_data(pkey),
 929                             ASN1_STRING_length(pkey)) == 0)
 930             goto err;
 931     } else {
 932         ECerr(EC_F_D2I_ECPRIVATEKEY, EC_R_MISSING_PRIVATE_KEY);
 933         goto err;
 934     }
 935
 936     EC_POINT_clear_free(ret->pub_key);
 937     ret->pub_key = EC_POINT_new(ret->group);
 938     if (ret->pub_key == NULL) {
 939         ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
 940         goto err;
 941     }
 942
 943     if (priv_key->publicKey) {
 944         const unsigned char *pub_oct;
 945         int pub_oct_len;
 946
 947         pub_oct = ASN1_STRING_get0_data(priv_key->publicKey);
 948         pub_oct_len = ASN1_STRING_length(priv_key->publicKey);
 949         if (!EC_KEY_oct2key(ret, pub_oct, pub_oct_len, NULL)) {
 950             ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
 951             goto err;
 952         }
 953     } else {
 954         if (ret->group->meth->keygenpub == NULL
 955             || ret->group->meth->keygenpub(ret) == 0)
 956                 goto err;
 957         /* Remember the original private-key-only encoding. */
 958         ret->enc_flag |= EC_PKEY_NO_PUBKEY;
 959     }
 960
 961     if (a)
 962         *a = ret;
 963     EC_PRIVATEKEY_free(priv_key);
 964     *in = p;
 965     return ret;
 966
 967  err:
 968     if (a == NULL || *a != ret)
 969         EC_KEY_free(ret);
 970     EC_PRIVATEKEY_free(priv_key);
 971     return NULL;
 972 }
 973
 974 int i2d_ECPrivateKey(const EC_KEY *a, unsigned char **out)
 975 {
 976     int ret = 0, ok = 0;
 977     unsigned char *priv= NULL, *pub= NULL;
 978     size_t privlen = 0, publen = 0;
 979
 980     EC_PRIVATEKEY *priv_key = NULL;
 981
 982     if (a == NULL || a->group == NULL ||
 983         (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key == NULL)) {
 984         ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_PASSED_NULL_PARAMETER);
 985         goto err;
 986     }
 987
 988     if ((priv_key = EC_PRIVATEKEY_new()) == NULL) {
 989         ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
 990         goto err;
 991     }
 992
 993     priv_key->version = a->version;
 994
 995     privlen = EC_KEY_priv2buf(a, &priv);
 996
 997     if (privlen == 0) {
 998         ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
 999         goto err;
1000     }
1001
1002     ASN1_STRING_set0(priv_key->privateKey, priv, privlen);
1003     priv = NULL;
1004
1005     if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS)) {
1006         if ((priv_key->parameters =
1007              EC_GROUP_get_ecpkparameters(a->group,
1008                                         priv_key->parameters)) == NULL) {
1009             ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1010             goto err;
1011         }
1012     }
1013
1014     if (!(a->enc_flag & EC_PKEY_NO_PUBKEY)) {
1015         priv_key->publicKey = ASN1_BIT_STRING_new();
1016         if (priv_key->publicKey == NULL) {
1017             ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1018             goto err;
1019         }
1020
1021         publen = EC_KEY_key2buf(a, a->conv_form, &pub, NULL);
1022
1023         if (publen == 0) {
1024             ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1025             goto err;
1026         }
1027
1028         priv_key->publicKey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
1029         priv_key->publicKey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
1030         ASN1_STRING_set0(priv_key->publicKey, pub, publen);
1031         pub = NULL;
1032     }
1033
1034     if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) {
1035         ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1036         goto err;
1037     }
1038     ok = 1;
1039  err:
1040     OPENSSL_clear_free(priv, privlen);
1041     OPENSSL_free(pub);
1042     EC_PRIVATEKEY_free(priv_key);
1043     return (ok ? ret : 0);
1044 }
1045
1046 int i2d_ECParameters(const EC_KEY *a, unsigned char **out)
1047 {
1048     if (a == NULL) {
1049         ECerr(EC_F_I2D_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1050         return 0;
1051     }
1052     return i2d_ECPKParameters(a->group, out);
1053 }
1054
1055 EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len)
1056 {
1057     EC_KEY *ret;
1058
1059     if (in == NULL || *in == NULL) {
1060         ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1061         return NULL;
1062     }
1063
1064     if (a == NULL || *a == NULL) {
1065         if ((ret = EC_KEY_new()) == NULL) {
1066             ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
1067             return NULL;
1068         }
1069     } else
1070         ret = *a;
1071
1072     if (!d2i_ECPKParameters(&ret->group, in, len)) {
1073         ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_EC_LIB);
1074         if (a == NULL || *a != ret)
1075              EC_KEY_free(ret);
1076         return NULL;
1077     }
1078
1079     if (a)
1080         *a = ret;
1081
1082     return ret;
1083 }
1084
1085 EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len)
1086 {
1087     EC_KEY *ret = NULL;
1088
1089     if (a == NULL || (*a) == NULL || (*a)->group == NULL) {
1090         /*
1091          * sorry, but a EC_GROUP-structure is necessary to set the public key
1092          */
1093         ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1094         return 0;
1095     }
1096     ret = *a;
1097     if (!EC_KEY_oct2key(ret, *in, len, NULL)) {
1098         ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_EC_LIB);
1099         return 0;
1100     }
1101     *in += len;
1102     return ret;
1103 }
1104
1105 int i2o_ECPublicKey(const EC_KEY *a, unsigned char **out)
1106 {
1107     size_t buf_len = 0;
1108     int new_buffer = 0;
1109
1110     if (a == NULL) {
1111         ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1112         return 0;
1113     }
1114
1115     buf_len = EC_POINT_point2oct(a->group, a->pub_key,
1116                                  a->conv_form, NULL, 0, NULL);
1117
1118     if (out == NULL || buf_len == 0)
1119         /* out == NULL => just return the length of the octet string */
1120         return buf_len;
1121
1122     if (*out == NULL) {
1123         if ((*out = OPENSSL_malloc(buf_len)) == NULL) {
1124             ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
1125             return 0;
1126         }
1127         new_buffer = 1;
1128     }
1129     if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form,
1130                             *out, buf_len, NULL)) {
1131         ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_EC_LIB);
1132         if (new_buffer) {
1133             OPENSSL_free(*out);
1134             *out = NULL;
1135         }
1136         return 0;
1137     }
1138     if (!new_buffer)
1139         *out += buf_len;
1140     return buf_len;
1141 }
1142
1143 DECLARE_ASN1_FUNCTIONS(ECDSA_SIG)
1144 DECLARE_ASN1_ENCODE_FUNCTIONS_name(ECDSA_SIG, ECDSA_SIG)
1145
1146 #endif /* FIPS_MODE */
1147
1148 ECDSA_SIG *ECDSA_SIG_new(void)
1149 {
1150     ECDSA_SIG *sig = OPENSSL_zalloc(sizeof(*sig));
1151     if (sig == NULL)
1152         ECerr(EC_F_ECDSA_SIG_NEW, ERR_R_MALLOC_FAILURE);
1153     return sig;
1154 }
1155
1156 void ECDSA_SIG_free(ECDSA_SIG *sig)
1157 {
1158     if (sig == NULL)
1159         return;
1160     BN_clear_free(sig->r);
1161     BN_clear_free(sig->s);
1162     OPENSSL_free(sig);
1163 }
1164
1165 ECDSA_SIG *d2i_ECDSA_SIG(ECDSA_SIG **psig, const unsigned char **ppin, long len)
1166 {
1167     ECDSA_SIG *sig;
1168
1169     if (len < 0)
1170         return NULL;
1171     if (psig != NULL && *psig != NULL) {
1172         sig = *psig;
1173     } else {
1174         sig = ECDSA_SIG_new();
1175         if (sig == NULL)
1176             return NULL;
1177     }
1178     if (sig->r == NULL)
1179         sig->r = BN_new();
1180     if (sig->s == NULL)
1181         sig->s = BN_new();
1182     if (decode_der_dsa_sig(sig->r, sig->s, ppin, (size_t)len) == 0) {
1183         if (psig == NULL || *psig == NULL)
1184             ECDSA_SIG_free(sig);
1185         return NULL;
1186     }
1187     if (psig != NULL && *psig == NULL)
1188         *psig = sig;
1189     return sig;
1190 }
1191
1192 int i2d_ECDSA_SIG(const ECDSA_SIG *sig, unsigned char **ppout)
1193 {
1194     BUF_MEM *buf = NULL;
1195     size_t encoded_len;
1196     WPACKET pkt;
1197
1198     if (ppout == NULL) {
1199         if (!WPACKET_init_null(&pkt, 0))
1200             return -1;
1201     } else if (*ppout == NULL) {
1202         if ((buf = BUF_MEM_new()) == NULL
1203                 || !WPACKET_init_len(&pkt, buf, 0)) {
1204             BUF_MEM_free(buf);
1205             return -1;
1206         }
1207     } else {
1208         if (!WPACKET_init_static_len(&pkt, *ppout, SIZE_MAX, 0))
1209             return -1;
1210     }
1211
1212     if (!encode_der_dsa_sig(&pkt, sig->r, sig->s)
1213             || !WPACKET_get_total_written(&pkt, &encoded_len)
1214             || !WPACKET_finish(&pkt)) {
1215         BUF_MEM_free(buf);
1216         WPACKET_cleanup(&pkt);
1217         return -1;
1218     }
1219
1220     if (ppout != NULL) {
1221         if (*ppout == NULL) {
1222             *ppout = (unsigned char *)buf->data;
1223             buf->data = NULL;
1224             BUF_MEM_free(buf);
1225         } else {
1226             *ppout += encoded_len;
1227         }
1228     }
1229
1230     return (int)encoded_len;
1231 }
1232
1233 void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps)
1234 {
1235     if (pr != NULL)
1236         *pr = sig->r;
1237     if (ps != NULL)
1238         *ps = sig->s;
1239 }
1240
1241 const BIGNUM *ECDSA_SIG_get0_r(const ECDSA_SIG *sig)
1242 {
1243     return sig->r;
1244 }
1245
1246 const BIGNUM *ECDSA_SIG_get0_s(const ECDSA_SIG *sig)
1247 {
1248     return sig->s;
1249 }
1250
1251 int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s)
1252 {
1253     if (r == NULL || s == NULL)
1254         return 0;
1255     BN_clear_free(sig->r);
1256     BN_clear_free(sig->s);
1257     sig->r = r;
1258     sig->s = s;
1259     return 1;
1260 }
1261
1262 #ifndef FIPS_MODE
1263 int ECDSA_size(const EC_KEY *r)
1264 {
1265     int ret, i;
1266     ASN1_INTEGER bs;
1267     unsigned char buf[4];
1268     const EC_GROUP *group;
1269
1270     if (r == NULL)
1271         return 0;
1272     group = EC_KEY_get0_group(r);
1273     if (group == NULL)
1274         return 0;
1275
1276     i = EC_GROUP_order_bits(group);
1277     if (i == 0)
1278         return 0;
1279     bs.length = (i + 7) / 8;
1280     bs.data = buf;
1281     bs.type = V_ASN1_INTEGER;
1282     /* If the top bit is set the asn1 encoding is 1 larger. */
1283     buf[0] = 0xff;
1284
1285     i = i2d_ASN1_INTEGER(&bs, NULL);
1286     i += i;                     /* r and s */
1287     ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE);
1288     return ret;
1289 }
1290 #endif