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 struct ecpk_parameters_st {
  78     int type;
  79     union {
  80         ASN1_OBJECT *named_curve;
  81         ECPARAMETERS *parameters;
  82         ASN1_NULL *implicitlyCA;
  83     } value;
  84 } /* ECPKPARAMETERS */ ;
  85
  86 /* SEC1 ECPrivateKey */
  87 typedef struct ec_privatekey_st {
  88     int32_t version;
  89     ASN1_OCTET_STRING *privateKey;
  90     ECPKPARAMETERS *parameters;
  91     ASN1_BIT_STRING *publicKey;
  92 } EC_PRIVATEKEY;
  93
  94 /* the OpenSSL ASN.1 definitions */
  95 ASN1_SEQUENCE(X9_62_PENTANOMIAL) = {
  96         ASN1_EMBED(X9_62_PENTANOMIAL, k1, INT32),
  97         ASN1_EMBED(X9_62_PENTANOMIAL, k2, INT32),
  98         ASN1_EMBED(X9_62_PENTANOMIAL, k3, INT32)
  99 } static_ASN1_SEQUENCE_END(X9_62_PENTANOMIAL)
 100
 101 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
 102 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
 103
 104 ASN1_ADB_TEMPLATE(char_two_def) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.other, ASN1_ANY);
 105
 106 ASN1_ADB(X9_62_CHARACTERISTIC_TWO) = {
 107         ADB_ENTRY(NID_X9_62_onBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.onBasis, ASN1_NULL)),
 108         ADB_ENTRY(NID_X9_62_tpBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.tpBasis, ASN1_INTEGER)),
 109         ADB_ENTRY(NID_X9_62_ppBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.ppBasis, X9_62_PENTANOMIAL))
 110 } ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO, 0, type, 0, &char_two_def_tt, NULL);
 111
 112 ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO) = {
 113         ASN1_EMBED(X9_62_CHARACTERISTIC_TWO, m, INT32),
 114         ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, type, ASN1_OBJECT),
 115         ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO)
 116 } static_ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO)
 117
 118 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
 119 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
 120
 121 ASN1_ADB_TEMPLATE(fieldID_def) = ASN1_SIMPLE(X9_62_FIELDID, p.other, ASN1_ANY);
 122
 123 ASN1_ADB(X9_62_FIELDID) = {
 124         ADB_ENTRY(NID_X9_62_prime_field, ASN1_SIMPLE(X9_62_FIELDID, p.prime, ASN1_INTEGER)),
 125         ADB_ENTRY(NID_X9_62_characteristic_two_field, ASN1_SIMPLE(X9_62_FIELDID, p.char_two, X9_62_CHARACTERISTIC_TWO))
 126 } ASN1_ADB_END(X9_62_FIELDID, 0, fieldType, 0, &fieldID_def_tt, NULL);
 127
 128 ASN1_SEQUENCE(X9_62_FIELDID) = {
 129         ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT),
 130         ASN1_ADB_OBJECT(X9_62_FIELDID)
 131 } static_ASN1_SEQUENCE_END(X9_62_FIELDID)
 132
 133 ASN1_SEQUENCE(X9_62_CURVE) = {
 134         ASN1_SIMPLE(X9_62_CURVE, a, ASN1_OCTET_STRING),
 135         ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING),
 136         ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING)
 137 } static_ASN1_SEQUENCE_END(X9_62_CURVE)
 138
 139 ASN1_SEQUENCE(ECPARAMETERS) = {
 140         ASN1_EMBED(ECPARAMETERS, version, INT32),
 141         ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID),
 142         ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE),
 143         ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING),
 144         ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER),
 145         ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER)
 146 } ASN1_SEQUENCE_END(ECPARAMETERS)
 147
 148 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
 149 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
 150
 151 ASN1_CHOICE(ECPKPARAMETERS) = {
 152         ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT),
 153         ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS),
 154         ASN1_SIMPLE(ECPKPARAMETERS, value.implicitlyCA, ASN1_NULL)
 155 } ASN1_CHOICE_END(ECPKPARAMETERS)
 156
 157 DECLARE_ASN1_FUNCTIONS(ECPKPARAMETERS)
 158 DECLARE_ASN1_ENCODE_FUNCTIONS_name(ECPKPARAMETERS, ECPKPARAMETERS)
 159 IMPLEMENT_ASN1_FUNCTIONS(ECPKPARAMETERS)
 160
 161 ASN1_SEQUENCE(EC_PRIVATEKEY) = {
 162         ASN1_EMBED(EC_PRIVATEKEY, version, INT32),
 163         ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING),
 164         ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0),
 165         ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1)
 166 } static_ASN1_SEQUENCE_END(EC_PRIVATEKEY)
 167
 168 DECLARE_ASN1_FUNCTIONS(EC_PRIVATEKEY)
 169 DECLARE_ASN1_ENCODE_FUNCTIONS_name(EC_PRIVATEKEY, EC_PRIVATEKEY)
 170 IMPLEMENT_ASN1_FUNCTIONS(EC_PRIVATEKEY)
 171
 172 /* some declarations of internal function */
 173
 174 /* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */
 175 static int ec_asn1_group2fieldid(const EC_GROUP *, X9_62_FIELDID *);
 176 /* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */
 177 static int ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *);
 178
 179 /* the function definitions */
 180
 181 static int ec_asn1_group2fieldid(const EC_GROUP *group, X9_62_FIELDID *field)
 182 {
 183     int ok = 0, nid;
 184     BIGNUM *tmp = NULL;
 185
 186     if (group == NULL || field == NULL)
 187         return 0;
 188
 189     /* clear the old values (if necessary) */
 190     ASN1_OBJECT_free(field->fieldType);
 191     ASN1_TYPE_free(field->p.other);
 192
 193     nid = EC_GROUP_get_field_type(group);
 194     /* set OID for the field */
 195     if ((field->fieldType = OBJ_nid2obj(nid)) == NULL) {
 196         ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
 197         goto err;
 198     }
 199
 200     if (nid == NID_X9_62_prime_field) {
 201         if ((tmp = BN_new()) == NULL) {
 202             ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
 203             goto err;
 204         }
 205         /* the parameters are specified by the prime number p */
 206         if (!EC_GROUP_get_curve(group, tmp, NULL, NULL, NULL)) {
 207             ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
 208             goto err;
 209         }
 210         /* set the prime number */
 211         field->p.prime = BN_to_ASN1_INTEGER(tmp, NULL);
 212         if (field->p.prime == NULL) {
 213             ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
 214             goto err;
 215         }
 216     } else if (nid == NID_X9_62_characteristic_two_field)
 217 #ifdef OPENSSL_NO_EC2M
 218     {
 219         ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_GF2M_NOT_SUPPORTED);
 220         goto err;
 221     }
 222 #else
 223     {
 224         int field_type;
 225         X9_62_CHARACTERISTIC_TWO *char_two;
 226
 227         field->p.char_two = X9_62_CHARACTERISTIC_TWO_new();
 228         char_two = field->p.char_two;
 229
 230         if (char_two == NULL) {
 231             ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
 232             goto err;
 233         }
 234
 235         char_two->m = (long)EC_GROUP_get_degree(group);
 236
 237         field_type = EC_GROUP_get_basis_type(group);
 238
 239         if (field_type == 0) {
 240             ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
 241             goto err;
 242         }
 243         /* set base type OID */
 244         if ((char_two->type = OBJ_nid2obj(field_type)) == NULL) {
 245             ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
 246             goto err;
 247         }
 248
 249         if (field_type == NID_X9_62_tpBasis) {
 250             unsigned int k;
 251
 252             if (!EC_GROUP_get_trinomial_basis(group, &k))
 253                 goto err;
 254
 255             char_two->p.tpBasis = ASN1_INTEGER_new();
 256             if (char_two->p.tpBasis == NULL) {
 257                 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
 258                 goto err;
 259             }
 260             if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k)) {
 261                 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
 262                 goto err;
 263             }
 264         } else if (field_type == NID_X9_62_ppBasis) {
 265             unsigned int k1, k2, k3;
 266
 267             if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3))
 268                 goto err;
 269
 270             char_two->p.ppBasis = X9_62_PENTANOMIAL_new();
 271             if (char_two->p.ppBasis == NULL) {
 272                 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
 273                 goto err;
 274             }
 275
 276             /* set k? values */
 277             char_two->p.ppBasis->k1 = (long)k1;
 278             char_two->p.ppBasis->k2 = (long)k2;
 279             char_two->p.ppBasis->k3 = (long)k3;
 280         } else {                /* field_type == NID_X9_62_onBasis */
 281
 282             /* for ONB the parameters are (asn1) NULL */
 283             char_two->p.onBasis = ASN1_NULL_new();
 284             if (char_two->p.onBasis == NULL) {
 285                 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
 286                 goto err;
 287             }
 288         }
 289     }
 290 #endif
 291     else {
 292         ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_UNSUPPORTED_FIELD);
 293         goto err;
 294     }
 295
 296     ok = 1;
 297
 298  err:
 299     BN_free(tmp);
 300     return ok;
 301 }
 302
 303 static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
 304 {
 305     int ok = 0;
 306     BIGNUM *tmp_1 = NULL, *tmp_2 = NULL;
 307     unsigned char *a_buf = NULL, *b_buf = NULL;
 308     size_t len;
 309
 310     if (!group || !curve || !curve->a || !curve->b)
 311         return 0;
 312
 313     if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL) {
 314         ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
 315         goto err;
 316     }
 317
 318     /* get a and b */
 319     if (!EC_GROUP_get_curve(group, NULL, tmp_1, tmp_2, NULL)) {
 320         ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
 321         goto err;
 322     }
 323
 324     /*
 325      * Per SEC 1, the curve coefficients must be padded up to size. See C.2's
 326      * definition of Curve, C.1's definition of FieldElement, and 2.3.5's
 327      * definition of how to encode the field elements.
 328      */
 329     len = ((size_t)EC_GROUP_get_degree(group) + 7) / 8;
 330     if ((a_buf = OPENSSL_malloc(len)) == NULL
 331         || (b_buf = OPENSSL_malloc(len)) == NULL) {
 332         ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
 333         goto err;
 334     }
 335     if (BN_bn2binpad(tmp_1, a_buf, len) < 0
 336         || BN_bn2binpad(tmp_2, b_buf, len) < 0) {
 337         ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
 338         goto err;
 339     }
 340
 341     /* set a and b */
 342     if (!ASN1_OCTET_STRING_set(curve->a, a_buf, len)
 343         || !ASN1_OCTET_STRING_set(curve->b, b_buf, len)) {
 344         ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
 345         goto err;
 346     }
 347
 348     /* set the seed (optional) */
 349     if (group->seed) {
 350         if (!curve->seed)
 351             if ((curve->seed = ASN1_BIT_STRING_new()) == NULL) {
 352                 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
 353                 goto err;
 354             }
 355         curve->seed->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
 356         curve->seed->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 357         if (!ASN1_BIT_STRING_set(curve->seed, group->seed,
 358                                  (int)group->seed_len)) {
 359             ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
 360             goto err;
 361         }
 362     } else {
 363         ASN1_BIT_STRING_free(curve->seed);
 364         curve->seed = NULL;
 365     }
 366
 367     ok = 1;
 368
 369  err:
 370     OPENSSL_free(a_buf);
 371     OPENSSL_free(b_buf);
 372     BN_free(tmp_1);
 373     BN_free(tmp_2);
 374     return ok;
 375 }
 376
 377 ECPARAMETERS *EC_GROUP_get_ecparameters(const EC_GROUP *group,
 378                                         ECPARAMETERS *params)
 379 {
 380     size_t len = 0;
 381     ECPARAMETERS *ret = NULL;
 382     const BIGNUM *tmp;
 383     unsigned char *buffer = NULL;
 384     const EC_POINT *point = NULL;
 385     point_conversion_form_t form;
 386     ASN1_INTEGER *orig;
 387
 388     if (params == NULL) {
 389         if ((ret = ECPARAMETERS_new()) == NULL) {
 390             ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
 391             goto err;
 392         }
 393     } else
 394         ret = params;
 395
 396     /* set the version (always one) */
 397     ret->version = (long)0x1;
 398
 399     /* set the fieldID */
 400     if (!ec_asn1_group2fieldid(group, ret->fieldID)) {
 401         ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
 402         goto err;
 403     }
 404
 405     /* set the curve */
 406     if (!ec_asn1_group2curve(group, ret->curve)) {
 407         ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
 408         goto err;
 409     }
 410
 411     /* set the base point */
 412     if ((point = EC_GROUP_get0_generator(group)) == NULL) {
 413         ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, EC_R_UNDEFINED_GENERATOR);
 414         goto err;
 415     }
 416
 417     form = EC_GROUP_get_point_conversion_form(group);
 418
 419     len = EC_POINT_point2buf(group, point, form, &buffer, NULL);
 420     if (len == 0) {
 421         ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
 422         goto err;
 423     }
 424     if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) {
 425         OPENSSL_free(buffer);
 426         ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
 427         goto err;
 428     }
 429     ASN1_STRING_set0(ret->base, buffer, len);
 430
 431     /* set the order */
 432     tmp = EC_GROUP_get0_order(group);
 433     if (tmp == NULL) {
 434         ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
 435         goto err;
 436     }
 437     ret->order = BN_to_ASN1_INTEGER(tmp, orig = ret->order);
 438     if (ret->order == NULL) {
 439         ret->order = orig;
 440         ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_ASN1_LIB);
 441         goto err;
 442     }
 443
 444     /* set the cofactor (optional) */
 445     tmp = EC_GROUP_get0_cofactor(group);
 446     if (tmp != NULL) {
 447         ret->cofactor = BN_to_ASN1_INTEGER(tmp, orig = ret->cofactor);
 448         if (ret->cofactor == NULL) {
 449             ret->cofactor = orig;
 450             ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_ASN1_LIB);
 451             goto err;
 452         }
 453     }
 454
 455     return ret;
 456
 457  err:
 458     if (params == NULL)
 459         ECPARAMETERS_free(ret);
 460     return NULL;
 461 }
 462
 463 ECPKPARAMETERS *EC_GROUP_get_ecpkparameters(const EC_GROUP *group,
 464                                             ECPKPARAMETERS *params)
 465 {
 466     int ok = 1, tmp;
 467     ECPKPARAMETERS *ret = params;
 468
 469     if (ret == NULL) {
 470         if ((ret = ECPKPARAMETERS_new()) == NULL) {
 471             ECerr(EC_F_EC_GROUP_GET_ECPKPARAMETERS, ERR_R_MALLOC_FAILURE);
 472             return NULL;
 473         }
 474     } else {
 475         if (ret->type == 0)
 476             ASN1_OBJECT_free(ret->value.named_curve);
 477         else if (ret->type == 1 && ret->value.parameters)
 478             ECPARAMETERS_free(ret->value.parameters);
 479     }
 480
 481     if (EC_GROUP_get_asn1_flag(group)) {
 482         /*
 483          * use the asn1 OID to describe the elliptic curve parameters
 484          */
 485         tmp = EC_GROUP_get_curve_name(group);
 486         if (tmp) {
 487             ASN1_OBJECT *asn1obj = OBJ_nid2obj(tmp);
 488
 489             if (asn1obj == NULL || OBJ_length(asn1obj) == 0) {
 490                 ASN1_OBJECT_free(asn1obj);
 491                 ECerr(EC_F_EC_GROUP_GET_ECPKPARAMETERS, EC_R_MISSING_OID);
 492                 ok = 0;
 493             } else {
 494                 ret->type = 0;
 495                 ret->value.named_curve = asn1obj;
 496             }
 497         } else
 498             /* we don't know the nid => ERROR */
 499             ok = 0;
 500     } else {
 501         /* use the ECPARAMETERS structure */
 502         ret->type = 1;
 503         if ((ret->value.parameters =
 504              EC_GROUP_get_ecparameters(group, NULL)) == NULL)
 505             ok = 0;
 506     }
 507
 508     if (!ok) {
 509         ECPKPARAMETERS_free(ret);
 510         return NULL;
 511     }
 512     return ret;
 513 }
 514
 515 EC_GROUP *EC_GROUP_new_from_ecparameters(const ECPARAMETERS *params)
 516 {
 517     int ok = 0, tmp;
 518     EC_GROUP *ret = NULL, *dup = NULL;
 519     BIGNUM *p = NULL, *a = NULL, *b = NULL;
 520     EC_POINT *point = NULL;
 521     long field_bits;
 522     int curve_name = NID_undef;
 523     BN_CTX *ctx = NULL;
 524
 525     if (params->fieldID == NULL
 526             || params->fieldID->fieldType == NULL
 527             || params->fieldID->p.ptr == NULL) {
 528         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
 529         goto err;
 530     }
 531
 532     /*
 533      * Now extract the curve parameters a and b. Note that, although SEC 1
 534      * specifies the length of their encodings, historical versions of OpenSSL
 535      * encoded them incorrectly, so we must accept any length for backwards
 536      * compatibility.
 537      */
 538     if (params->curve == NULL
 539             || params->curve->a == NULL || params->curve->a->data == NULL
 540             || params->curve->b == NULL || params->curve->b->data == NULL) {
 541         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
 542         goto err;
 543     }
 544     a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
 545     if (a == NULL) {
 546         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB);
 547         goto err;
 548     }
 549     b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
 550     if (b == NULL) {
 551         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB);
 552         goto err;
 553     }
 554
 555     /* get the field parameters */
 556     tmp = OBJ_obj2nid(params->fieldID->fieldType);
 557     if (tmp == NID_X9_62_characteristic_two_field)
 558 #ifdef OPENSSL_NO_EC2M
 559     {
 560         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_GF2M_NOT_SUPPORTED);
 561         goto err;
 562     }
 563 #else
 564     {
 565         X9_62_CHARACTERISTIC_TWO *char_two;
 566
 567         char_two = params->fieldID->p.char_two;
 568
 569         field_bits = char_two->m;
 570         if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
 571             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_FIELD_TOO_LARGE);
 572             goto err;
 573         }
 574
 575         if ((p = BN_new()) == NULL) {
 576             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
 577             goto err;
 578         }
 579
 580         /* get the base type */
 581         tmp = OBJ_obj2nid(char_two->type);
 582
 583         if (tmp == NID_X9_62_tpBasis) {
 584             long tmp_long;
 585
 586             if (!char_two->p.tpBasis) {
 587                 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
 588                 goto err;
 589             }
 590
 591             tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis);
 592
 593             if (!(char_two->m > tmp_long && tmp_long > 0)) {
 594                 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS,
 595                       EC_R_INVALID_TRINOMIAL_BASIS);
 596                 goto err;
 597             }
 598
 599             /* create the polynomial */
 600             if (!BN_set_bit(p, (int)char_two->m))
 601                 goto err;
 602             if (!BN_set_bit(p, (int)tmp_long))
 603                 goto err;
 604             if (!BN_set_bit(p, 0))
 605                 goto err;
 606         } else if (tmp == NID_X9_62_ppBasis) {
 607             X9_62_PENTANOMIAL *penta;
 608
 609             penta = char_two->p.ppBasis;
 610             if (penta == NULL) {
 611                 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
 612                 goto err;
 613             }
 614
 615             if (!
 616                 (char_two->m > penta->k3 && penta->k3 > penta->k2
 617                  && penta->k2 > penta->k1 && penta->k1 > 0)) {
 618                 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS,
 619                       EC_R_INVALID_PENTANOMIAL_BASIS);
 620                 goto err;
 621             }
 622
 623             /* create the polynomial */
 624             if (!BN_set_bit(p, (int)char_two->m))
 625                 goto err;
 626             if (!BN_set_bit(p, (int)penta->k1))
 627                 goto err;
 628             if (!BN_set_bit(p, (int)penta->k2))
 629                 goto err;
 630             if (!BN_set_bit(p, (int)penta->k3))
 631                 goto err;
 632             if (!BN_set_bit(p, 0))
 633                 goto err;
 634         } else if (tmp == NID_X9_62_onBasis) {
 635             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_NOT_IMPLEMENTED);
 636             goto err;
 637         } else {                /* error */
 638
 639             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
 640             goto err;
 641         }
 642
 643         /* create the EC_GROUP structure */
 644         ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
 645     }
 646 #endif
 647     else if (tmp == NID_X9_62_prime_field) {
 648         /* we have a curve over a prime field */
 649         /* extract the prime number */
 650         if (params->fieldID->p.prime == NULL) {
 651             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
 652             goto err;
 653         }
 654         p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
 655         if (p == NULL) {
 656             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
 657             goto err;
 658         }
 659
 660         if (BN_is_negative(p) || BN_is_zero(p)) {
 661             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_FIELD);
 662             goto err;
 663         }
 664
 665         field_bits = BN_num_bits(p);
 666         if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
 667             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_FIELD_TOO_LARGE);
 668             goto err;
 669         }
 670
 671         /* create the EC_GROUP structure */
 672         ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
 673     } else {
 674         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_FIELD);
 675         goto err;
 676     }
 677
 678     if (ret == NULL) {
 679         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
 680         goto err;
 681     }
 682
 683     /* extract seed (optional) */
 684     if (params->curve->seed != NULL) {
 685         OPENSSL_free(ret->seed);
 686         if ((ret->seed = OPENSSL_malloc(params->curve->seed->length)) == NULL) {
 687             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
 688             goto err;
 689         }
 690         memcpy(ret->seed, params->curve->seed->data,
 691                params->curve->seed->length);
 692         ret->seed_len = params->curve->seed->length;
 693     }
 694
 695     if (params->order == NULL
 696             || params->base == NULL
 697             || params->base->data == NULL) {
 698         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
 699         goto err;
 700     }
 701
 702     if ((point = EC_POINT_new(ret)) == NULL)
 703         goto err;
 704
 705     /* set the point conversion form */
 706     EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
 707                                        (params->base->data[0] & ~0x01));
 708
 709     /* extract the ec point */
 710     if (!EC_POINT_oct2point(ret, point, params->base->data,
 711                             params->base->length, NULL)) {
 712         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
 713         goto err;
 714     }
 715
 716     /* extract the order */
 717     if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL) {
 718         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
 719         goto err;
 720     }
 721     if (BN_is_negative(a) || BN_is_zero(a)) {
 722         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_GROUP_ORDER);
 723         goto err;
 724     }
 725     if (BN_num_bits(a) > (int)field_bits + 1) { /* Hasse bound */
 726         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_GROUP_ORDER);
 727         goto err;
 728     }
 729
 730     /* extract the cofactor (optional) */
 731     if (params->cofactor == NULL) {
 732         BN_free(b);
 733         b = NULL;
 734     } else if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL) {
 735         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
 736         goto err;
 737     }
 738     /* set the generator, order and cofactor (if present) */
 739     if (!EC_GROUP_set_generator(ret, point, a, b)) {
 740         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
 741         goto err;
 742     }
 743
 744     /*
 745      * Check if the explicit parameters group just created matches one of the
 746      * built-in curves.
 747      *
 748      * We create a copy of the group just built, so that we can remove optional
 749      * fields for the lookup: we do this to avoid the possibility that one of
 750      * the optional parameters is used to force the library into using a less
 751      * performant and less secure EC_METHOD instead of the specialized one.
 752      * In any case, `seed` is not really used in any computation, while a
 753      * cofactor different from the one in the built-in table is just
 754      * mathematically wrong anyway and should not be used.
 755      */
 756     if ((ctx = BN_CTX_new()) == NULL) {
 757         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB);
 758         goto err;
 759     }
 760     if ((dup = EC_GROUP_dup(ret)) == NULL
 761             || EC_GROUP_set_seed(dup, NULL, 0) != 1
 762             || !EC_GROUP_set_generator(dup, point, a, NULL)) {
 763         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
 764         goto err;
 765     }
 766     if ((curve_name = ec_curve_nid_from_params(dup, ctx)) != NID_undef) {
 767         /*
 768          * The input explicit parameters successfully matched one of the
 769          * built-in curves: often for built-in curves we have specialized
 770          * methods with better performance and hardening.
 771          *
 772          * In this case we replace the `EC_GROUP` created through explicit
 773          * parameters with one created from a named group.
 774          */
 775         EC_GROUP *named_group = NULL;
 776
 777 #ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
 778         /*
 779          * NID_wap_wsg_idm_ecid_wtls12 and NID_secp224r1 are both aliases for
 780          * the same curve, we prefer the SECP nid when matching explicit
 781          * parameters as that is associated with a specialized EC_METHOD.
 782          */
 783         if (curve_name == NID_wap_wsg_idm_ecid_wtls12)
 784             curve_name = NID_secp224r1;
 785 #endif /* !def(OPENSSL_NO_EC_NISTP_64_GCC_128) */
 786
 787         if ((named_group = EC_GROUP_new_by_curve_name(curve_name)) == NULL) {
 788             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
 789             goto err;
 790         }
 791         EC_GROUP_free(ret);
 792         ret = named_group;
 793
 794         /*
 795          * Set the flag so that EC_GROUPs created from explicit parameters are
 796          * serialized using explicit parameters by default.
 797          */
 798         EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_EXPLICIT_CURVE);
 799
 800         /*
 801          * If the input params do not contain the optional seed field we make
 802          * sure it is not added to the returned group.
 803          *
 804          * The seed field is not really used inside libcrypto anyway, and
 805          * adding it to parsed explicit parameter keys would alter their DER
 806          * encoding output (because of the extra field) which could impact
 807          * applications fingerprinting keys by their DER encoding.
 808          */
 809         if (params->curve->seed == NULL) {
 810             if (EC_GROUP_set_seed(ret, NULL, 0) != 1)
 811                 goto err;
 812         }
 813     }
 814
 815     ok = 1;
 816
 817  err:
 818     if (!ok) {
 819         EC_GROUP_free(ret);
 820         ret = NULL;
 821     }
 822     EC_GROUP_free(dup);
 823
 824     BN_free(p);
 825     BN_free(a);
 826     BN_free(b);
 827     EC_POINT_free(point);
 828
 829     BN_CTX_free(ctx);
 830
 831     return ret;
 832 }
 833
 834 EC_GROUP *EC_GROUP_new_from_ecpkparameters(const ECPKPARAMETERS *params)
 835 {
 836     EC_GROUP *ret = NULL;
 837     int tmp = 0;
 838
 839     if (params == NULL) {
 840         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, EC_R_MISSING_PARAMETERS);
 841         return NULL;
 842     }
 843
 844     if (params->type == 0) {    /* the curve is given by an OID */
 845         tmp = OBJ_obj2nid(params->value.named_curve);
 846         if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL) {
 847             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS,
 848                   EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
 849             return NULL;
 850         }
 851         EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
 852     } else if (params->type == 1) { /* the parameters are given by a
 853                                      * ECPARAMETERS structure */
 854         ret = EC_GROUP_new_from_ecparameters(params->value.parameters);
 855         if (!ret) {
 856             ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, ERR_R_EC_LIB);
 857             return NULL;
 858         }
 859         EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_EXPLICIT_CURVE);
 860     } else if (params->type == 2) { /* implicitlyCA */
 861         return NULL;
 862     } else {
 863         ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, EC_R_ASN1_ERROR);
 864         return NULL;
 865     }
 866
 867     return ret;
 868 }
 869
 870 /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
 871
 872 EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len)
 873 {
 874     EC_GROUP *group = NULL;
 875     ECPKPARAMETERS *params = NULL;
 876     const unsigned char *p = *in;
 877
 878     if ((params = d2i_ECPKPARAMETERS(NULL, &p, len)) == NULL) {
 879         ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_D2I_ECPKPARAMETERS_FAILURE);
 880         ECPKPARAMETERS_free(params);
 881         return NULL;
 882     }
 883
 884     if ((group = EC_GROUP_new_from_ecpkparameters(params)) == NULL) {
 885         ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_PKPARAMETERS2GROUP_FAILURE);
 886         ECPKPARAMETERS_free(params);
 887         return NULL;
 888     }
 889
 890     if (a) {
 891         EC_GROUP_free(*a);
 892         *a = group;
 893     }
 894
 895     ECPKPARAMETERS_free(params);
 896     *in = p;
 897     return group;
 898 }
 899
 900 int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out)
 901 {
 902     int ret = 0;
 903     ECPKPARAMETERS *tmp = EC_GROUP_get_ecpkparameters(a, NULL);
 904     if (tmp == NULL) {
 905         ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_GROUP2PKPARAMETERS_FAILURE);
 906         return 0;
 907     }
 908     if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) {
 909         ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_I2D_ECPKPARAMETERS_FAILURE);
 910         ECPKPARAMETERS_free(tmp);
 911         return 0;
 912     }
 913     ECPKPARAMETERS_free(tmp);
 914     return ret;
 915 }
 916
 917 /* some EC_KEY functions */
 918
 919 EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
 920 {
 921     EC_KEY *ret = NULL;
 922     EC_PRIVATEKEY *priv_key = NULL;
 923     const unsigned char *p = *in;
 924
 925     if ((priv_key = d2i_EC_PRIVATEKEY(NULL, &p, len)) == NULL) {
 926         ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
 927         return NULL;
 928     }
 929
 930     if (a == NULL || *a == NULL) {
 931         if ((ret = EC_KEY_new()) == NULL) {
 932             ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
 933             goto err;
 934         }
 935     } else
 936         ret = *a;
 937
 938     if (priv_key->parameters) {
 939         EC_GROUP_free(ret->group);
 940         ret->group = EC_GROUP_new_from_ecpkparameters(priv_key->parameters);
 941     }
 942
 943     if (ret->group == NULL) {
 944         ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
 945         goto err;
 946     }
 947
 948     ret->version = priv_key->version;
 949
 950     if (priv_key->privateKey) {
 951         ASN1_OCTET_STRING *pkey = priv_key->privateKey;
 952         if (EC_KEY_oct2priv(ret, ASN1_STRING_get0_data(pkey),
 953                             ASN1_STRING_length(pkey)) == 0)
 954             goto err;
 955     } else {
 956         ECerr(EC_F_D2I_ECPRIVATEKEY, EC_R_MISSING_PRIVATE_KEY);
 957         goto err;
 958     }
 959
 960     EC_POINT_clear_free(ret->pub_key);
 961     ret->pub_key = EC_POINT_new(ret->group);
 962     if (ret->pub_key == NULL) {
 963         ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
 964         goto err;
 965     }
 966
 967     if (priv_key->publicKey) {
 968         const unsigned char *pub_oct;
 969         int pub_oct_len;
 970
 971         pub_oct = ASN1_STRING_get0_data(priv_key->publicKey);
 972         pub_oct_len = ASN1_STRING_length(priv_key->publicKey);
 973         if (!EC_KEY_oct2key(ret, pub_oct, pub_oct_len, NULL)) {
 974             ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
 975             goto err;
 976         }
 977     } else {
 978         if (ret->group->meth->keygenpub == NULL
 979             || ret->group->meth->keygenpub(ret) == 0)
 980                 goto err;
 981         /* Remember the original private-key-only encoding. */
 982         ret->enc_flag |= EC_PKEY_NO_PUBKEY;
 983     }
 984
 985     if (a)
 986         *a = ret;
 987     EC_PRIVATEKEY_free(priv_key);
 988     *in = p;
 989     ret->dirty_cnt++;
 990     return ret;
 991
 992  err:
 993     if (a == NULL || *a != ret)
 994         EC_KEY_free(ret);
 995     EC_PRIVATEKEY_free(priv_key);
 996     return NULL;
 997 }
 998
 999 int i2d_ECPrivateKey(const EC_KEY *a, unsigned char **out)
1000 {
1001     int ret = 0, ok = 0;
1002     unsigned char *priv= NULL, *pub= NULL;
1003     size_t privlen = 0, publen = 0;
1004
1005     EC_PRIVATEKEY *priv_key = NULL;
1006
1007     if (a == NULL || a->group == NULL ||
1008         (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key == NULL)) {
1009         ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_PASSED_NULL_PARAMETER);
1010         goto err;
1011     }
1012
1013     if ((priv_key = EC_PRIVATEKEY_new()) == NULL) {
1014         ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1015         goto err;
1016     }
1017
1018     priv_key->version = a->version;
1019
1020     privlen = EC_KEY_priv2buf(a, &priv);
1021
1022     if (privlen == 0) {
1023         ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1024         goto err;
1025     }
1026
1027     ASN1_STRING_set0(priv_key->privateKey, priv, privlen);
1028     priv = NULL;
1029
1030     if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS)) {
1031         if ((priv_key->parameters =
1032              EC_GROUP_get_ecpkparameters(a->group,
1033                                         priv_key->parameters)) == NULL) {
1034             ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1035             goto err;
1036         }
1037     }
1038
1039     if (!(a->enc_flag & EC_PKEY_NO_PUBKEY)) {
1040         priv_key->publicKey = ASN1_BIT_STRING_new();
1041         if (priv_key->publicKey == NULL) {
1042             ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1043             goto err;
1044         }
1045
1046         publen = EC_KEY_key2buf(a, a->conv_form, &pub, NULL);
1047
1048         if (publen == 0) {
1049             ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1050             goto err;
1051         }
1052
1053         priv_key->publicKey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
1054         priv_key->publicKey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
1055         ASN1_STRING_set0(priv_key->publicKey, pub, publen);
1056         pub = NULL;
1057     }
1058
1059     if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) {
1060         ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1061         goto err;
1062     }
1063     ok = 1;
1064  err:
1065     OPENSSL_clear_free(priv, privlen);
1066     OPENSSL_free(pub);
1067     EC_PRIVATEKEY_free(priv_key);
1068     return (ok ? ret : 0);
1069 }
1070
1071 int i2d_ECParameters(const EC_KEY *a, unsigned char **out)
1072 {
1073     if (a == NULL) {
1074         ECerr(EC_F_I2D_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1075         return 0;
1076     }
1077     return i2d_ECPKParameters(a->group, out);
1078 }
1079
1080 EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len)
1081 {
1082     EC_KEY *ret;
1083
1084     if (in == NULL || *in == NULL) {
1085         ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1086         return NULL;
1087     }
1088
1089     if (a == NULL || *a == NULL) {
1090         if ((ret = EC_KEY_new()) == NULL) {
1091             ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
1092             return NULL;
1093         }
1094     } else
1095         ret = *a;
1096
1097     if (!d2i_ECPKParameters(&ret->group, in, len)) {
1098         ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_EC_LIB);
1099         if (a == NULL || *a != ret)
1100              EC_KEY_free(ret);
1101         else
1102             ret->dirty_cnt++;
1103         return NULL;
1104     }
1105     ret->dirty_cnt++;
1106
1107     if (a)
1108         *a = ret;
1109
1110     return ret;
1111 }
1112
1113 EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len)
1114 {
1115     EC_KEY *ret = NULL;
1116
1117     if (a == NULL || (*a) == NULL || (*a)->group == NULL) {
1118         /*
1119          * sorry, but a EC_GROUP-structure is necessary to set the public key
1120          */
1121         ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1122         return 0;
1123     }
1124     ret = *a;
1125     /* EC_KEY_opt2key updates dirty_cnt */
1126     if (!EC_KEY_oct2key(ret, *in, len, NULL)) {
1127         ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_EC_LIB);
1128         return 0;
1129     }
1130     *in += len;
1131     return ret;
1132 }
1133
1134 int i2o_ECPublicKey(const EC_KEY *a, unsigned char **out)
1135 {
1136     size_t buf_len = 0;
1137     int new_buffer = 0;
1138
1139     if (a == NULL) {
1140         ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1141         return 0;
1142     }
1143
1144     buf_len = EC_POINT_point2oct(a->group, a->pub_key,
1145                                  a->conv_form, NULL, 0, NULL);
1146
1147     if (out == NULL || buf_len == 0)
1148         /* out == NULL => just return the length of the octet string */
1149         return buf_len;
1150
1151     if (*out == NULL) {
1152         if ((*out = OPENSSL_malloc(buf_len)) == NULL) {
1153             ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
1154             return 0;
1155         }
1156         new_buffer = 1;
1157     }
1158     if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form,
1159                             *out, buf_len, NULL)) {
1160         ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_EC_LIB);
1161         if (new_buffer) {
1162             OPENSSL_free(*out);
1163             *out = NULL;
1164         }
1165         return 0;
1166     }
1167     if (!new_buffer)
1168         *out += buf_len;
1169     return buf_len;
1170 }
1171
1172 DECLARE_ASN1_FUNCTIONS(ECDSA_SIG)
1173 DECLARE_ASN1_ENCODE_FUNCTIONS_name(ECDSA_SIG, ECDSA_SIG)
1174
1175 #endif /* FIPS_MODULE */
1176
1177 ECDSA_SIG *ECDSA_SIG_new(void)
1178 {
1179     ECDSA_SIG *sig = OPENSSL_zalloc(sizeof(*sig));
1180     if (sig == NULL)
1181         ECerr(EC_F_ECDSA_SIG_NEW, ERR_R_MALLOC_FAILURE);
1182     return sig;
1183 }
1184
1185 void ECDSA_SIG_free(ECDSA_SIG *sig)
1186 {
1187     if (sig == NULL)
1188         return;
1189     BN_clear_free(sig->r);
1190     BN_clear_free(sig->s);
1191     OPENSSL_free(sig);
1192 }
1193
1194 ECDSA_SIG *d2i_ECDSA_SIG(ECDSA_SIG **psig, const unsigned char **ppin, long len)
1195 {
1196     ECDSA_SIG *sig;
1197
1198     if (len < 0)
1199         return NULL;
1200     if (psig != NULL && *psig != NULL) {
1201         sig = *psig;
1202     } else {
1203         sig = ECDSA_SIG_new();
1204         if (sig == NULL)
1205             return NULL;
1206     }
1207     if (sig->r == NULL)
1208         sig->r = BN_new();
1209     if (sig->s == NULL)
1210         sig->s = BN_new();
1211     if (decode_der_dsa_sig(sig->r, sig->s, ppin, (size_t)len) == 0) {
1212         if (psig == NULL || *psig == NULL)
1213             ECDSA_SIG_free(sig);
1214         return NULL;
1215     }
1216     if (psig != NULL && *psig == NULL)
1217         *psig = sig;
1218     return sig;
1219 }
1220
1221 int i2d_ECDSA_SIG(const ECDSA_SIG *sig, unsigned char **ppout)
1222 {
1223     BUF_MEM *buf = NULL;
1224     size_t encoded_len;
1225     WPACKET pkt;
1226
1227     if (ppout == NULL) {
1228         if (!WPACKET_init_null(&pkt, 0))
1229             return -1;
1230     } else if (*ppout == NULL) {
1231         if ((buf = BUF_MEM_new()) == NULL
1232                 || !WPACKET_init_len(&pkt, buf, 0)) {
1233             BUF_MEM_free(buf);
1234             return -1;
1235         }
1236     } else {
1237         if (!WPACKET_init_static_len(&pkt, *ppout, SIZE_MAX, 0))
1238             return -1;
1239     }
1240
1241     if (!encode_der_dsa_sig(&pkt, sig->r, sig->s)
1242             || !WPACKET_get_total_written(&pkt, &encoded_len)
1243             || !WPACKET_finish(&pkt)) {
1244         BUF_MEM_free(buf);
1245         WPACKET_cleanup(&pkt);
1246         return -1;
1247     }
1248
1249     if (ppout != NULL) {
1250         if (*ppout == NULL) {
1251             *ppout = (unsigned char *)buf->data;
1252             buf->data = NULL;
1253             BUF_MEM_free(buf);
1254         } else {
1255             *ppout += encoded_len;
1256         }
1257     }
1258
1259     return (int)encoded_len;
1260 }
1261
1262 void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps)
1263 {
1264     if (pr != NULL)
1265         *pr = sig->r;
1266     if (ps != NULL)
1267         *ps = sig->s;
1268 }
1269
1270 const BIGNUM *ECDSA_SIG_get0_r(const ECDSA_SIG *sig)
1271 {
1272     return sig->r;
1273 }
1274
1275 const BIGNUM *ECDSA_SIG_get0_s(const ECDSA_SIG *sig)
1276 {
1277     return sig->s;
1278 }
1279
1280 int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s)
1281 {
1282     if (r == NULL || s == NULL)
1283         return 0;
1284     BN_clear_free(sig->r);
1285     BN_clear_free(sig->s);
1286     sig->r = r;
1287     sig->s = s;
1288     return 1;
1289 }
1290
1291 int ECDSA_size(const EC_KEY *ec)
1292 {
1293     int ret;
1294     ECDSA_SIG sig;
1295     const EC_GROUP *group;
1296     const BIGNUM *bn;
1297
1298     if (ec == NULL)
1299         return 0;
1300     group = EC_KEY_get0_group(ec);
1301     if (group == NULL)
1302         return 0;
1303
1304     bn = EC_GROUP_get0_order(group);
1305     if (bn == NULL)
1306         return 0;
1307
1308     sig.r = sig.s = (BIGNUM *)bn;
1309     ret = i2d_ECDSA_SIG(&sig, NULL);
1310
1311     if (ret < 0)
1312         ret = 0;
1313     return ret;
1314 }