include/openssl/ec.h

   1 /*
   2  * Copyright 2002-2020 The OpenSSL Project Authors. All Rights Reserved.
   3  * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
   4  *
   5  * Licensed under the Apache License 2.0 (the "License").  You may not use
   6  * this file except in compliance with the License.  You can obtain a copy
   7  * in the file LICENSE in the source distribution or at
   8  * https://www.openssl.org/source/license.html
   9  */
  10
  11 #ifndef OPENSSL_EC_H
  12 # define OPENSSL_EC_H
  13 # pragma once
  14
  15 # include <openssl/macros.h>
  16 # ifndef OPENSSL_NO_DEPRECATED_3_0
  17 #  define HEADER_EC_H
  18 # endif
  19
  20 # include <openssl/opensslconf.h>
  21
  22 # ifndef OPENSSL_NO_EC
  23 #  include <openssl/asn1.h>
  24 #  include <openssl/symhacks.h>
  25 #  ifndef OPENSSL_NO_DEPRECATED_1_1_0
  26 #   include <openssl/bn.h>
  27 #  endif
  28 #  include <openssl/ecerr.h>
  29 #  ifdef  __cplusplus
  30 extern "C" {
  31 #  endif
  32
  33 #  ifndef OPENSSL_ECC_MAX_FIELD_BITS
  34 #   define OPENSSL_ECC_MAX_FIELD_BITS 661
  35 #  endif
  36
  37 /** Enum for the point conversion form as defined in X9.62 (ECDSA)
  38  *  for the encoding of a elliptic curve point (x,y) */
  39 typedef enum {
  40         /** the point is encoded as z||x, where the octet z specifies
  41          *  which solution of the quadratic equation y is  */
  42     POINT_CONVERSION_COMPRESSED = 2,
  43         /** the point is encoded as z||x||y, where z is the octet 0x04  */
  44     POINT_CONVERSION_UNCOMPRESSED = 4,
  45         /** the point is encoded as z||x||y, where the octet z specifies
  46          *  which solution of the quadratic equation y is  */
  47     POINT_CONVERSION_HYBRID = 6
  48 } point_conversion_form_t;
  49
  50 #  include <openssl/params.h>
  51 #  ifndef OPENSSL_NO_DEPRECATED_3_0
  52 typedef struct ec_method_st EC_METHOD;
  53 #  endif
  54 typedef struct ec_group_st EC_GROUP;
  55 typedef struct ec_point_st EC_POINT;
  56 typedef struct ecpk_parameters_st ECPKPARAMETERS;
  57 typedef struct ec_parameters_st ECPARAMETERS;
  58
  59 /********************************************************************/
  60 /*               EC_METHODs for curves over GF(p)                   */
  61 /********************************************************************/
  62
  63 /** Returns the basic GFp ec methods which provides the basis for the
  64  *  optimized methods.
  65  *  \return  EC_METHOD object
  66  */
  67 DEPRECATEDIN_3_0(const EC_METHOD *EC_GFp_simple_method(void))
  68
  69 /** Returns GFp methods using montgomery multiplication.
  70  *  \return  EC_METHOD object
  71  */
  72 DEPRECATEDIN_3_0(const EC_METHOD *EC_GFp_mont_method(void))
  73
  74 /** Returns GFp methods using optimized methods for NIST recommended curves
  75  *  \return  EC_METHOD object
  76  */
  77 DEPRECATEDIN_3_0(const EC_METHOD *EC_GFp_nist_method(void))
  78
  79 #  ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
  80 /** Returns 64-bit optimized methods for nistp224
  81  *  \return  EC_METHOD object
  82  */
  83 DEPRECATEDIN_3_0(const EC_METHOD *EC_GFp_nistp224_method(void))
  84
  85 /** Returns 64-bit optimized methods for nistp256
  86  *  \return  EC_METHOD object
  87  */
  88 DEPRECATEDIN_3_0(const EC_METHOD *EC_GFp_nistp256_method(void))
  89
  90 /** Returns 64-bit optimized methods for nistp521
  91  *  \return  EC_METHOD object
  92  */
  93 DEPRECATEDIN_3_0(const EC_METHOD *EC_GFp_nistp521_method(void))
  94 #  endif
  95
  96 #  ifndef OPENSSL_NO_EC2M
  97 /********************************************************************/
  98 /*           EC_METHOD for curves over GF(2^m)                      */
  99 /********************************************************************/
 100
 101 /** Returns the basic GF2m ec method
 102  *  \return  EC_METHOD object
 103  */
 104 DEPRECATEDIN_3_0(const EC_METHOD *EC_GF2m_simple_method(void))
 105
 106 #  endif
 107
 108 /********************************************************************/
 109 /*                   EC_GROUP functions                             */
 110 /********************************************************************/
 111
 112 /**
 113  *  Creates a new EC_GROUP object
 114  *  \param   meth   EC_METHOD to use
 115  *  \return  newly created EC_GROUP object or NULL in case of an error.
 116  */
 117 DEPRECATEDIN_3_0(EC_GROUP *EC_GROUP_new(const EC_METHOD *meth))
 118
 119 /** Frees a EC_GROUP object
 120  *  \param  group  EC_GROUP object to be freed.
 121  */
 122 void EC_GROUP_free(EC_GROUP *group);
 123
 124 /** Clears and frees a EC_GROUP object
 125  *  \param  group  EC_GROUP object to be cleared and freed.
 126  */
 127 DEPRECATEDIN_3_0(void EC_GROUP_clear_free(EC_GROUP *group))
 128
 129 /** Copies EC_GROUP objects. Note: both EC_GROUPs must use the same EC_METHOD.
 130  *  \param  dst  destination EC_GROUP object
 131  *  \param  src  source EC_GROUP object
 132  *  \return 1 on success and 0 if an error occurred.
 133  */
 134 int EC_GROUP_copy(EC_GROUP *dst, const EC_GROUP *src);
 135
 136 /** Creates a new EC_GROUP object and copies the content
 137  *  form src to the newly created EC_KEY object
 138  *  \param  src  source EC_GROUP object
 139  *  \return newly created EC_GROUP object or NULL in case of an error.
 140  */
 141 EC_GROUP *EC_GROUP_dup(const EC_GROUP *src);
 142
 143 /** Returns the EC_METHOD of the EC_GROUP object.
 144  *  \param  group  EC_GROUP object
 145  *  \return EC_METHOD used in this EC_GROUP object.
 146  */
 147 DEPRECATEDIN_3_0(const EC_METHOD *EC_GROUP_method_of(const EC_GROUP *group))
 148
 149 /** Returns the field type of the EC_METHOD.
 150  *  \param  meth  EC_METHOD object
 151  *  \return NID of the underlying field type OID.
 152  */
 153 DEPRECATEDIN_3_0(int EC_METHOD_get_field_type(const EC_METHOD *meth))
 154
 155 /** Sets the generator and its order/cofactor of a EC_GROUP object.
 156  *  \param  group      EC_GROUP object
 157  *  \param  generator  EC_POINT object with the generator.
 158  *  \param  order      the order of the group generated by the generator.
 159  *  \param  cofactor   the index of the sub-group generated by the generator
 160  *                     in the group of all points on the elliptic curve.
 161  *  \return 1 on success and 0 if an error occurred
 162  */
 163 int EC_GROUP_set_generator(EC_GROUP *group, const EC_POINT *generator,
 164                            const BIGNUM *order, const BIGNUM *cofactor);
 165
 166 /** Returns the generator of a EC_GROUP object.
 167  *  \param  group  EC_GROUP object
 168  *  \return the currently used generator (possibly NULL).
 169  */
 170 const EC_POINT *EC_GROUP_get0_generator(const EC_GROUP *group);
 171
 172 /** Returns the montgomery data for order(Generator)
 173  *  \param  group  EC_GROUP object
 174  *  \return the currently used montgomery data (possibly NULL).
 175 */
 176 BN_MONT_CTX *EC_GROUP_get_mont_data(const EC_GROUP *group);
 177
 178 /** Gets the order of a EC_GROUP
 179  *  \param  group  EC_GROUP object
 180  *  \param  order  BIGNUM to which the order is copied
 181  *  \param  ctx    unused
 182  *  \return 1 on success and 0 if an error occurred
 183  */
 184 int EC_GROUP_get_order(const EC_GROUP *group, BIGNUM *order, BN_CTX *ctx);
 185
 186 /** Gets the order of an EC_GROUP
 187  *  \param  group  EC_GROUP object
 188  *  \return the group order
 189  */
 190 const BIGNUM *EC_GROUP_get0_order(const EC_GROUP *group);
 191
 192 /** Gets the number of bits of the order of an EC_GROUP
 193  *  \param  group  EC_GROUP object
 194  *  \return number of bits of group order.
 195  */
 196 int EC_GROUP_order_bits(const EC_GROUP *group);
 197
 198 /** Gets the cofactor of a EC_GROUP
 199  *  \param  group     EC_GROUP object
 200  *  \param  cofactor  BIGNUM to which the cofactor is copied
 201  *  \param  ctx       unused
 202  *  \return 1 on success and 0 if an error occurred
 203  */
 204 int EC_GROUP_get_cofactor(const EC_GROUP *group, BIGNUM *cofactor,
 205                           BN_CTX *ctx);
 206
 207 /** Gets the cofactor of an EC_GROUP
 208  *  \param  group  EC_GROUP object
 209  *  \return the group cofactor
 210  */
 211 const BIGNUM *EC_GROUP_get0_cofactor(const EC_GROUP *group);
 212
 213 /** Sets the name of a EC_GROUP object
 214  *  \param  group  EC_GROUP object
 215  *  \param  nid    NID of the curve name OID
 216  */
 217 void EC_GROUP_set_curve_name(EC_GROUP *group, int nid);
 218
 219 /** Returns the curve name of a EC_GROUP object
 220  *  \param  group  EC_GROUP object
 221  *  \return NID of the curve name OID or 0 if not set.
 222  */
 223 int EC_GROUP_get_curve_name(const EC_GROUP *group);
 224
 225 /** Gets the field of an EC_GROUP
 226  *  \param  group  EC_GROUP object
 227  *  \return the group field
 228  */
 229 const BIGNUM *EC_GROUP_get0_field(const EC_GROUP *group);
 230
 231 /** Returns the field type of the EC_GROUP.
 232  *  \param  group  EC_GROUP object
 233  *  \return NID of the underlying field type OID.
 234  */
 235 int EC_GROUP_get_field_type(const EC_GROUP *group);
 236
 237 void EC_GROUP_set_asn1_flag(EC_GROUP *group, int flag);
 238 int EC_GROUP_get_asn1_flag(const EC_GROUP *group);
 239
 240 void EC_GROUP_set_point_conversion_form(EC_GROUP *group,
 241                                         point_conversion_form_t form);
 242 point_conversion_form_t EC_GROUP_get_point_conversion_form(const EC_GROUP *);
 243
 244 unsigned char *EC_GROUP_get0_seed(const EC_GROUP *x);
 245 size_t EC_GROUP_get_seed_len(const EC_GROUP *);
 246 size_t EC_GROUP_set_seed(EC_GROUP *, const unsigned char *, size_t len);
 247
 248 /** Sets the parameters of a ec curve defined by y^2 = x^3 + a*x + b (for GFp)
 249  *  or y^2 + x*y = x^3 + a*x^2 + b (for GF2m)
 250  *  \param  group  EC_GROUP object
 251  *  \param  p      BIGNUM with the prime number (GFp) or the polynomial
 252  *                 defining the underlying field (GF2m)
 253  *  \param  a      BIGNUM with parameter a of the equation
 254  *  \param  b      BIGNUM with parameter b of the equation
 255  *  \param  ctx    BN_CTX object (optional)
 256  *  \return 1 on success and 0 if an error occurred
 257  */
 258 int EC_GROUP_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a,
 259                        const BIGNUM *b, BN_CTX *ctx);
 260
 261 /** Gets the parameters of the ec curve defined by y^2 = x^3 + a*x + b (for GFp)
 262  *  or y^2 + x*y = x^3 + a*x^2 + b (for GF2m)
 263  *  \param  group  EC_GROUP object
 264  *  \param  p      BIGNUM with the prime number (GFp) or the polynomial
 265  *                 defining the underlying field (GF2m)
 266  *  \param  a      BIGNUM for parameter a of the equation
 267  *  \param  b      BIGNUM for parameter b of the equation
 268  *  \param  ctx    BN_CTX object (optional)
 269  *  \return 1 on success and 0 if an error occurred
 270  */
 271 int EC_GROUP_get_curve(const EC_GROUP *group, BIGNUM *p, BIGNUM *a, BIGNUM *b,
 272                        BN_CTX *ctx);
 273
 274 /** Sets the parameters of an ec curve. Synonym for EC_GROUP_set_curve
 275  *  \param  group  EC_GROUP object
 276  *  \param  p      BIGNUM with the prime number (GFp) or the polynomial
 277  *                 defining the underlying field (GF2m)
 278  *  \param  a      BIGNUM with parameter a of the equation
 279  *  \param  b      BIGNUM with parameter b of the equation
 280  *  \param  ctx    BN_CTX object (optional)
 281  *  \return 1 on success and 0 if an error occurred
 282  */
 283 DEPRECATEDIN_3_0(int EC_GROUP_set_curve_GFp(EC_GROUP *group, const BIGNUM *p,
 284                                           const BIGNUM *a, const BIGNUM *b,
 285                                           BN_CTX *ctx))
 286
 287 /** Gets the parameters of an ec curve. Synonym for EC_GROUP_get_curve
 288  *  \param  group  EC_GROUP object
 289  *  \param  p      BIGNUM with the prime number (GFp) or the polynomial
 290  *                 defining the underlying field (GF2m)
 291  *  \param  a      BIGNUM for parameter a of the equation
 292  *  \param  b      BIGNUM for parameter b of the equation
 293  *  \param  ctx    BN_CTX object (optional)
 294  *  \return 1 on success and 0 if an error occurred
 295  */
 296 DEPRECATEDIN_3_0(int EC_GROUP_get_curve_GFp(const EC_GROUP *group, BIGNUM *p,
 297                                           BIGNUM *a, BIGNUM *b,
 298                                           BN_CTX *ctx))
 299
 300 #  ifndef OPENSSL_NO_EC2M
 301 /** Sets the parameter of an ec curve. Synonym for EC_GROUP_set_curve
 302  *  \param  group  EC_GROUP object
 303  *  \param  p      BIGNUM with the prime number (GFp) or the polynomial
 304  *                 defining the underlying field (GF2m)
 305  *  \param  a      BIGNUM with parameter a of the equation
 306  *  \param  b      BIGNUM with parameter b of the equation
 307  *  \param  ctx    BN_CTX object (optional)
 308  *  \return 1 on success and 0 if an error occurred
 309  */
 310 DEPRECATEDIN_3_0(int EC_GROUP_set_curve_GF2m(EC_GROUP *group, const BIGNUM *p,
 311                                            const BIGNUM *a, const BIGNUM *b,
 312                                            BN_CTX *ctx))
 313
 314 /** Gets the parameters of an ec curve. Synonym for EC_GROUP_get_curve
 315  *  \param  group  EC_GROUP object
 316  *  \param  p      BIGNUM with the prime number (GFp) or the polynomial
 317  *                 defining the underlying field (GF2m)
 318  *  \param  a      BIGNUM for parameter a of the equation
 319  *  \param  b      BIGNUM for parameter b of the equation
 320  *  \param  ctx    BN_CTX object (optional)
 321  *  \return 1 on success and 0 if an error occurred
 322  */
 323 DEPRECATEDIN_3_0(int EC_GROUP_get_curve_GF2m(const EC_GROUP *group, BIGNUM *p,
 324                                            BIGNUM *a, BIGNUM *b,
 325                                            BN_CTX *ctx))
 326 #  endif
 327 /** Returns the number of bits needed to represent a field element
 328  *  \param  group  EC_GROUP object
 329  *  \return number of bits needed to represent a field element
 330  */
 331 int EC_GROUP_get_degree(const EC_GROUP *group);
 332
 333 /** Checks whether the parameter in the EC_GROUP define a valid ec group
 334  *  \param  group  EC_GROUP object
 335  *  \param  ctx    BN_CTX object (optional)
 336  *  \return 1 if group is a valid ec group and 0 otherwise
 337  */
 338 int EC_GROUP_check(const EC_GROUP *group, BN_CTX *ctx);
 339
 340 /** Checks whether the discriminant of the elliptic curve is zero or not
 341  *  \param  group  EC_GROUP object
 342  *  \param  ctx    BN_CTX object (optional)
 343  *  \return 1 if the discriminant is not zero and 0 otherwise
 344  */
 345 int EC_GROUP_check_discriminant(const EC_GROUP *group, BN_CTX *ctx);
 346
 347 /** Compares two EC_GROUP objects
 348  *  \param  a    first EC_GROUP object
 349  *  \param  b    second EC_GROUP object
 350  *  \param  ctx  BN_CTX object (optional)
 351  *  \return 0 if the groups are equal, 1 if not, or -1 on error
 352  */
 353 int EC_GROUP_cmp(const EC_GROUP *a, const EC_GROUP *b, BN_CTX *ctx);
 354
 355 /*
 356  * EC_GROUP_new_GF*() calls EC_GROUP_new() and EC_GROUP_set_GF*() after
 357  * choosing an appropriate EC_METHOD
 358  */
 359
 360 /** Creates a new EC_GROUP object with the specified parameters defined
 361  *  over GFp (defined by the equation y^2 = x^3 + a*x + b)
 362  *  \param  p    BIGNUM with the prime number
 363  *  \param  a    BIGNUM with the parameter a of the equation
 364  *  \param  b    BIGNUM with the parameter b of the equation
 365  *  \param  ctx  BN_CTX object (optional)
 366  *  \return newly created EC_GROUP object with the specified parameters
 367  */
 368 EC_GROUP *EC_GROUP_new_curve_GFp(const BIGNUM *p, const BIGNUM *a,
 369                                  const BIGNUM *b, BN_CTX *ctx);
 370 #  ifndef OPENSSL_NO_EC2M
 371 /** Creates a new EC_GROUP object with the specified parameters defined
 372  *  over GF2m (defined by the equation y^2 + x*y = x^3 + a*x^2 + b)
 373  *  \param  p    BIGNUM with the polynomial defining the underlying field
 374  *  \param  a    BIGNUM with the parameter a of the equation
 375  *  \param  b    BIGNUM with the parameter b of the equation
 376  *  \param  ctx  BN_CTX object (optional)
 377  *  \return newly created EC_GROUP object with the specified parameters
 378  */
 379 EC_GROUP *EC_GROUP_new_curve_GF2m(const BIGNUM *p, const BIGNUM *a,
 380                                   const BIGNUM *b, BN_CTX *ctx);
 381 #  endif
 382
 383 /**
 384  * Creates a EC_GROUP object with a curve specified by parameters.
 385  * The parameters may be explicit or a named curve,
 386  *  \param  params A list of parameters describing the group.
 387  *  \param  libctx The associated library context or NULL for the default
 388  *                 context
 389  *  \param  propq  A property query string
 390  *  \return newly created EC_GROUP object with specified parameters or NULL
 391  *          if an error occurred
 392  */
 393 EC_GROUP *EC_GROUP_new_from_params(const OSSL_PARAM params[],
 394                                    OPENSSL_CTX *libctx, const char *propq);
 395
 396 /**
 397  * Creates a EC_GROUP object with a curve specified by a NID
 398  *  \param  libctx The associated library context or NULL for the default
 399  *                 context
 400  *  \param  propq  A property query string
 401  *  \param  nid    NID of the OID of the curve name
 402  *  \return newly created EC_GROUP object with specified curve or NULL
 403  *          if an error occurred
 404  */
 405 EC_GROUP *EC_GROUP_new_by_curve_name_ex(OPENSSL_CTX *libctx, const char *propq,
 406                                         int nid);
 407
 408 /**
 409  * Creates a EC_GROUP object with a curve specified by a NID. Same as
 410  * EC_GROUP_new_by_curve_name_ex but the libctx and propq are always
 411  * NULL.
 412  *  \param  nid    NID of the OID of the curve name
 413  *  \return newly created EC_GROUP object with specified curve or NULL
 414  *          if an error occurred
 415  */
 416 EC_GROUP *EC_GROUP_new_by_curve_name(int nid);
 417
 418 /** Creates a new EC_GROUP object from an ECPARAMETERS object
 419  *  \param  params  pointer to the ECPARAMETERS object
 420  *  \return newly created EC_GROUP object with specified curve or NULL
 421  *          if an error occurred
 422  */
 423 EC_GROUP *EC_GROUP_new_from_ecparameters(const ECPARAMETERS *params);
 424
 425 /** Creates an ECPARAMETERS object for the given EC_GROUP object.
 426  *  \param  group   pointer to the EC_GROUP object
 427  *  \param  params  pointer to an existing ECPARAMETERS object or NULL
 428  *  \return pointer to the new ECPARAMETERS object or NULL
 429  *          if an error occurred.
 430  */
 431 ECPARAMETERS *EC_GROUP_get_ecparameters(const EC_GROUP *group,
 432                                         ECPARAMETERS *params);
 433
 434 /** Creates a new EC_GROUP object from an ECPKPARAMETERS object
 435  *  \param  params  pointer to an existing ECPKPARAMETERS object, or NULL
 436  *  \return newly created EC_GROUP object with specified curve, or NULL
 437  *          if an error occurred
 438  */
 439 EC_GROUP *EC_GROUP_new_from_ecpkparameters(const ECPKPARAMETERS *params);
 440
 441 /** Creates an ECPKPARAMETERS object for the given EC_GROUP object.
 442  *  \param  group   pointer to the EC_GROUP object
 443  *  \param  params  pointer to an existing ECPKPARAMETERS object or NULL
 444  *  \return pointer to the new ECPKPARAMETERS object or NULL
 445  *          if an error occurred.
 446  */
 447 ECPKPARAMETERS *EC_GROUP_get_ecpkparameters(const EC_GROUP *group,
 448                                             ECPKPARAMETERS *params);
 449
 450 /********************************************************************/
 451 /*               handling of internal curves                        */
 452 /********************************************************************/
 453
 454 typedef struct {
 455     int nid;
 456     const char *comment;
 457 } EC_builtin_curve;
 458
 459 /*
 460  * EC_builtin_curves(EC_builtin_curve *r, size_t size) returns number of all
 461  * available curves or zero if a error occurred. In case r is not zero,
 462  * nitems EC_builtin_curve structures are filled with the data of the first
 463  * nitems internal groups
 464  */
 465 size_t EC_get_builtin_curves(EC_builtin_curve *r, size_t nitems);
 466
 467 const char *EC_curve_nid2nist(int nid);
 468 int EC_curve_nist2nid(const char *name);
 469 int EC_GROUP_check_named_curve(const EC_GROUP *group, int nist_only,
 470                                BN_CTX *ctx);
 471
 472 /********************************************************************/
 473 /*                    EC_POINT functions                            */
 474 /********************************************************************/
 475
 476 /** Creates a new EC_POINT object for the specified EC_GROUP
 477  *  \param  group  EC_GROUP the underlying EC_GROUP object
 478  *  \return newly created EC_POINT object or NULL if an error occurred
 479  */
 480 EC_POINT *EC_POINT_new(const EC_GROUP *group);
 481
 482 /** Frees a EC_POINT object
 483  *  \param  point  EC_POINT object to be freed
 484  */
 485 void EC_POINT_free(EC_POINT *point);
 486
 487 /** Clears and frees a EC_POINT object
 488  *  \param  point  EC_POINT object to be cleared and freed
 489  */
 490 void EC_POINT_clear_free(EC_POINT *point);
 491
 492 /** Copies EC_POINT object
 493  *  \param  dst  destination EC_POINT object
 494  *  \param  src  source EC_POINT object
 495  *  \return 1 on success and 0 if an error occurred
 496  */
 497 int EC_POINT_copy(EC_POINT *dst, const EC_POINT *src);
 498
 499 /** Creates a new EC_POINT object and copies the content of the supplied
 500  *  EC_POINT
 501  *  \param  src    source EC_POINT object
 502  *  \param  group  underlying the EC_GROUP object
 503  *  \return newly created EC_POINT object or NULL if an error occurred
 504  */
 505 EC_POINT *EC_POINT_dup(const EC_POINT *src, const EC_GROUP *group);
 506
 507 /** Returns the EC_METHOD used in EC_POINT object
 508  *  \param  point  EC_POINT object
 509  *  \return the EC_METHOD used
 510  */
 511 DEPRECATEDIN_3_0(const EC_METHOD *EC_POINT_method_of(const EC_POINT *point))
 512
 513 /** Sets a point to infinity (neutral element)
 514  *  \param  group  underlying EC_GROUP object
 515  *  \param  point  EC_POINT to set to infinity
 516  *  \return 1 on success and 0 if an error occurred
 517  */
 518 int EC_POINT_set_to_infinity(const EC_GROUP *group, EC_POINT *point);
 519
 520 /** Sets the jacobian projective coordinates of a EC_POINT over GFp
 521  *  \param  group  underlying EC_GROUP object
 522  *  \param  p      EC_POINT object
 523  *  \param  x      BIGNUM with the x-coordinate
 524  *  \param  y      BIGNUM with the y-coordinate
 525  *  \param  z      BIGNUM with the z-coordinate
 526  *  \param  ctx    BN_CTX object (optional)
 527  *  \return 1 on success and 0 if an error occurred
 528  */
 529 DEPRECATEDIN_3_0(int EC_POINT_set_Jprojective_coordinates_GFp(const EC_GROUP *group,
 530                                              EC_POINT *p, const BIGNUM *x,
 531                                              const BIGNUM *y, const BIGNUM *z,
 532                                              BN_CTX *ctx))
 533
 534 /** Gets the jacobian projective coordinates of a EC_POINT over GFp
 535  *  \param  group  underlying EC_GROUP object
 536  *  \param  p      EC_POINT object
 537  *  \param  x      BIGNUM for the x-coordinate
 538  *  \param  y      BIGNUM for the y-coordinate
 539  *  \param  z      BIGNUM for the z-coordinate
 540  *  \param  ctx    BN_CTX object (optional)
 541  *  \return 1 on success and 0 if an error occurred
 542  */
 543 DEPRECATEDIN_3_0(int EC_POINT_get_Jprojective_coordinates_GFp(const EC_GROUP *group,
 544                                              const EC_POINT *p, BIGNUM *x,
 545                                              BIGNUM *y, BIGNUM *z,
 546                                              BN_CTX *ctx))
 547
 548 /** Sets the affine coordinates of an EC_POINT
 549  *  \param  group  underlying EC_GROUP object
 550  *  \param  p      EC_POINT object
 551  *  \param  x      BIGNUM with the x-coordinate
 552  *  \param  y      BIGNUM with the y-coordinate
 553  *  \param  ctx    BN_CTX object (optional)
 554  *  \return 1 on success and 0 if an error occurred
 555  */
 556 int EC_POINT_set_affine_coordinates(const EC_GROUP *group, EC_POINT *p,
 557                                     const BIGNUM *x, const BIGNUM *y,
 558                                     BN_CTX *ctx);
 559
 560 /** Gets the affine coordinates of an EC_POINT.
 561  *  \param  group  underlying EC_GROUP object
 562  *  \param  p      EC_POINT object
 563  *  \param  x      BIGNUM for the x-coordinate
 564  *  \param  y      BIGNUM for the y-coordinate
 565  *  \param  ctx    BN_CTX object (optional)
 566  *  \return 1 on success and 0 if an error occurred
 567  */
 568 int EC_POINT_get_affine_coordinates(const EC_GROUP *group, const EC_POINT *p,
 569                                     BIGNUM *x, BIGNUM *y, BN_CTX *ctx);
 570
 571 /** Sets the affine coordinates of an EC_POINT. A synonym of
 572  *  EC_POINT_set_affine_coordinates
 573  *  \param  group  underlying EC_GROUP object
 574  *  \param  p      EC_POINT object
 575  *  \param  x      BIGNUM with the x-coordinate
 576  *  \param  y      BIGNUM with the y-coordinate
 577  *  \param  ctx    BN_CTX object (optional)
 578  *  \return 1 on success and 0 if an error occurred
 579  */
 580 DEPRECATEDIN_3_0(int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group,
 581                                                        EC_POINT *p,
 582                                                        const BIGNUM *x,
 583                                                        const BIGNUM *y,
 584                                                        BN_CTX *ctx))
 585
 586 /** Gets the affine coordinates of an EC_POINT. A synonym of
 587  *  EC_POINT_get_affine_coordinates
 588  *  \param  group  underlying EC_GROUP object
 589  *  \param  p      EC_POINT object
 590  *  \param  x      BIGNUM for the x-coordinate
 591  *  \param  y      BIGNUM for the y-coordinate
 592  *  \param  ctx    BN_CTX object (optional)
 593  *  \return 1 on success and 0 if an error occurred
 594  */
 595 DEPRECATEDIN_3_0(int EC_POINT_get_affine_coordinates_GFp(const EC_GROUP *group,
 596                                                        const EC_POINT *p,
 597                                                        BIGNUM *x,
 598                                                        BIGNUM *y,
 599                                                        BN_CTX *ctx))
 600
 601 /** Sets the x9.62 compressed coordinates of a EC_POINT
 602  *  \param  group  underlying EC_GROUP object
 603  *  \param  p      EC_POINT object
 604  *  \param  x      BIGNUM with x-coordinate
 605  *  \param  y_bit  integer with the y-Bit (either 0 or 1)
 606  *  \param  ctx    BN_CTX object (optional)
 607  *  \return 1 on success and 0 if an error occurred
 608  */
 609 int EC_POINT_set_compressed_coordinates(const EC_GROUP *group, EC_POINT *p,
 610                                         const BIGNUM *x, int y_bit,
 611                                         BN_CTX *ctx);
 612
 613 /** Sets the x9.62 compressed coordinates of a EC_POINT. A synonym of
 614  *  EC_POINT_set_compressed_coordinates
 615  *  \param  group  underlying EC_GROUP object
 616  *  \param  p      EC_POINT object
 617  *  \param  x      BIGNUM with x-coordinate
 618  *  \param  y_bit  integer with the y-Bit (either 0 or 1)
 619  *  \param  ctx    BN_CTX object (optional)
 620  *  \return 1 on success and 0 if an error occurred
 621  */
 622 DEPRECATEDIN_3_0(int EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP *group,
 623                                                            EC_POINT *p,
 624                                                            const BIGNUM *x,
 625                                                            int y_bit,
 626                                                            BN_CTX *ctx))
 627 #  ifndef OPENSSL_NO_EC2M
 628 /** Sets the affine coordinates of an EC_POINT. A synonym of
 629  *  EC_POINT_set_affine_coordinates
 630  *  \param  group  underlying EC_GROUP object
 631  *  \param  p      EC_POINT object
 632  *  \param  x      BIGNUM with the x-coordinate
 633  *  \param  y      BIGNUM with the y-coordinate
 634  *  \param  ctx    BN_CTX object (optional)
 635  *  \return 1 on success and 0 if an error occurred
 636  */
 637 DEPRECATEDIN_3_0(int EC_POINT_set_affine_coordinates_GF2m(const EC_GROUP *group,
 638                                                         EC_POINT *p,
 639                                                         const BIGNUM *x,
 640                                                         const BIGNUM *y,
 641                                                         BN_CTX *ctx))
 642
 643 /** Gets the affine coordinates of an EC_POINT. A synonym of
 644  *  EC_POINT_get_affine_coordinates
 645  *  \param  group  underlying EC_GROUP object
 646  *  \param  p      EC_POINT object
 647  *  \param  x      BIGNUM for the x-coordinate
 648  *  \param  y      BIGNUM for the y-coordinate
 649  *  \param  ctx    BN_CTX object (optional)
 650  *  \return 1 on success and 0 if an error occurred
 651  */
 652 DEPRECATEDIN_3_0(int EC_POINT_get_affine_coordinates_GF2m(const EC_GROUP *group,
 653                                                         const EC_POINT *p,
 654                                                         BIGNUM *x,
 655                                                         BIGNUM *y,
 656                                                         BN_CTX *ctx))
 657
 658 /** Sets the x9.62 compressed coordinates of a EC_POINT. A synonym of
 659  *  EC_POINT_set_compressed_coordinates
 660  *  \param  group  underlying EC_GROUP object
 661  *  \param  p      EC_POINT object
 662  *  \param  x      BIGNUM with x-coordinate
 663  *  \param  y_bit  integer with the y-Bit (either 0 or 1)
 664  *  \param  ctx    BN_CTX object (optional)
 665  *  \return 1 on success and 0 if an error occurred
 666  */
 667 DEPRECATEDIN_3_0(int EC_POINT_set_compressed_coordinates_GF2m(const EC_GROUP *group,
 668                                                             EC_POINT *p,
 669                                                             const BIGNUM *x,
 670                                                             int y_bit,
 671                                                             BN_CTX *ctx))
 672 #  endif
 673 /** Encodes a EC_POINT object to a octet string
 674  *  \param  group  underlying EC_GROUP object
 675  *  \param  p      EC_POINT object
 676  *  \param  form   point conversion form
 677  *  \param  buf    memory buffer for the result. If NULL the function returns
 678  *                 required buffer size.
 679  *  \param  len    length of the memory buffer
 680  *  \param  ctx    BN_CTX object (optional)
 681  *  \return the length of the encoded octet string or 0 if an error occurred
 682  */
 683 size_t EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *p,
 684                           point_conversion_form_t form,
 685                           unsigned char *buf, size_t len, BN_CTX *ctx);
 686
 687 /** Decodes a EC_POINT from a octet string
 688  *  \param  group  underlying EC_GROUP object
 689  *  \param  p      EC_POINT object
 690  *  \param  buf    memory buffer with the encoded ec point
 691  *  \param  len    length of the encoded ec point
 692  *  \param  ctx    BN_CTX object (optional)
 693  *  \return 1 on success and 0 if an error occurred
 694  */
 695 int EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *p,
 696                        const unsigned char *buf, size_t len, BN_CTX *ctx);
 697
 698 /** Encodes an EC_POINT object to an allocated octet string
 699  *  \param  group  underlying EC_GROUP object
 700  *  \param  point  EC_POINT object
 701  *  \param  form   point conversion form
 702  *  \param  pbuf   returns pointer to allocated buffer
 703  *  \param  ctx    BN_CTX object (optional)
 704  *  \return the length of the encoded octet string or 0 if an error occurred
 705  */
 706 size_t EC_POINT_point2buf(const EC_GROUP *group, const EC_POINT *point,
 707                           point_conversion_form_t form,
 708                           unsigned char **pbuf, BN_CTX *ctx);
 709
 710 /* other interfaces to point2oct/oct2point: */
 711 BIGNUM *EC_POINT_point2bn(const EC_GROUP *, const EC_POINT *,
 712                           point_conversion_form_t form, BIGNUM *, BN_CTX *);
 713 EC_POINT *EC_POINT_bn2point(const EC_GROUP *, const BIGNUM *,
 714                             EC_POINT *, BN_CTX *);
 715 char *EC_POINT_point2hex(const EC_GROUP *, const EC_POINT *,
 716                          point_conversion_form_t form, BN_CTX *);
 717 EC_POINT *EC_POINT_hex2point(const EC_GROUP *, const char *,
 718                              EC_POINT *, BN_CTX *);
 719
 720 /********************************************************************/
 721 /*         functions for doing EC_POINT arithmetic                  */
 722 /********************************************************************/
 723
 724 /** Computes the sum of two EC_POINT
 725  *  \param  group  underlying EC_GROUP object
 726  *  \param  r      EC_POINT object for the result (r = a + b)
 727  *  \param  a      EC_POINT object with the first summand
 728  *  \param  b      EC_POINT object with the second summand
 729  *  \param  ctx    BN_CTX object (optional)
 730  *  \return 1 on success and 0 if an error occurred
 731  */
 732 int EC_POINT_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a,
 733                  const EC_POINT *b, BN_CTX *ctx);
 734
 735 /** Computes the double of a EC_POINT
 736  *  \param  group  underlying EC_GROUP object
 737  *  \param  r      EC_POINT object for the result (r = 2 * a)
 738  *  \param  a      EC_POINT object
 739  *  \param  ctx    BN_CTX object (optional)
 740  *  \return 1 on success and 0 if an error occurred
 741  */
 742 int EC_POINT_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a,
 743                  BN_CTX *ctx);
 744
 745 /** Computes the inverse of a EC_POINT
 746  *  \param  group  underlying EC_GROUP object
 747  *  \param  a      EC_POINT object to be inverted (it's used for the result as well)
 748  *  \param  ctx    BN_CTX object (optional)
 749  *  \return 1 on success and 0 if an error occurred
 750  */
 751 int EC_POINT_invert(const EC_GROUP *group, EC_POINT *a, BN_CTX *ctx);
 752
 753 /** Checks whether the point is the neutral element of the group
 754  *  \param  group  the underlying EC_GROUP object
 755  *  \param  p      EC_POINT object
 756  *  \return 1 if the point is the neutral element and 0 otherwise
 757  */
 758 int EC_POINT_is_at_infinity(const EC_GROUP *group, const EC_POINT *p);
 759
 760 /** Checks whether the point is on the curve
 761  *  \param  group  underlying EC_GROUP object
 762  *  \param  point  EC_POINT object to check
 763  *  \param  ctx    BN_CTX object (optional)
 764  *  \return 1 if the point is on the curve, 0 if not, or -1 on error
 765  */
 766 int EC_POINT_is_on_curve(const EC_GROUP *group, const EC_POINT *point,
 767                          BN_CTX *ctx);
 768
 769 /** Compares two EC_POINTs
 770  *  \param  group  underlying EC_GROUP object
 771  *  \param  a      first EC_POINT object
 772  *  \param  b      second EC_POINT object
 773  *  \param  ctx    BN_CTX object (optional)
 774  *  \return 1 if the points are not equal, 0 if they are, or -1 on error
 775  */
 776 int EC_POINT_cmp(const EC_GROUP *group, const EC_POINT *a, const EC_POINT *b,
 777                  BN_CTX *ctx);
 778
 779 DEPRECATEDIN_3_0(int EC_POINT_make_affine(const EC_GROUP *group,
 780                                           EC_POINT *point, BN_CTX *ctx))
 781 DEPRECATEDIN_3_0(int EC_POINTs_make_affine(const EC_GROUP *group, size_t num,
 782                                            EC_POINT *points[], BN_CTX *ctx))
 783
 784 /** Computes r = generator * n + sum_{i=0}^{num-1} p[i] * m[i]
 785  *  \param  group  underlying EC_GROUP object
 786  *  \param  r      EC_POINT object for the result
 787  *  \param  n      BIGNUM with the multiplier for the group generator (optional)
 788  *  \param  num    number further summands
 789  *  \param  p      array of size num of EC_POINT objects
 790  *  \param  m      array of size num of BIGNUM objects
 791  *  \param  ctx    BN_CTX object (optional)
 792  *  \return 1 on success and 0 if an error occurred
 793  */
 794 DEPRECATEDIN_3_0(int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r,
 795                                    const BIGNUM *n, size_t num,
 796                                    const EC_POINT *p[], const BIGNUM *m[],
 797                                    BN_CTX *ctx))
 798
 799 /** Computes r = generator * n + q * m
 800  *  \param  group  underlying EC_GROUP object
 801  *  \param  r      EC_POINT object for the result
 802  *  \param  n      BIGNUM with the multiplier for the group generator (optional)
 803  *  \param  q      EC_POINT object with the first factor of the second summand
 804  *  \param  m      BIGNUM with the second factor of the second summand
 805  *  \param  ctx    BN_CTX object (optional)
 806  *  \return 1 on success and 0 if an error occurred
 807  */
 808 int EC_POINT_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *n,
 809                  const EC_POINT *q, const BIGNUM *m, BN_CTX *ctx);
 810
 811 /** Stores multiples of generator for faster point multiplication
 812  *  \param  group  EC_GROUP object
 813  *  \param  ctx    BN_CTX object (optional)
 814  *  \return 1 on success and 0 if an error occurred
 815  */
 816 DEPRECATEDIN_3_0(int EC_GROUP_precompute_mult(EC_GROUP *group, BN_CTX *ctx))
 817
 818 /** Reports whether a precomputation has been done
 819  *  \param  group  EC_GROUP object
 820  *  \return 1 if a pre-computation has been done and 0 otherwise
 821  */
 822 DEPRECATEDIN_3_0(int EC_GROUP_have_precompute_mult(const EC_GROUP *group))
 823
 824 /********************************************************************/
 825 /*                       ASN1 stuff                                 */
 826 /********************************************************************/
 827
 828 DECLARE_ASN1_ITEM(ECPKPARAMETERS)
 829 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPKPARAMETERS)
 830 DECLARE_ASN1_ITEM(ECPARAMETERS)
 831 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
 832
 833 /*
 834  * EC_GROUP_get_basis_type() returns the NID of the basis type used to
 835  * represent the field elements
 836  */
 837 int EC_GROUP_get_basis_type(const EC_GROUP *);
 838 #  ifndef OPENSSL_NO_EC2M
 839 int EC_GROUP_get_trinomial_basis(const EC_GROUP *, unsigned int *k);
 840 int EC_GROUP_get_pentanomial_basis(const EC_GROUP *, unsigned int *k1,
 841                                    unsigned int *k2, unsigned int *k3);
 842 #  endif
 843
 844 #  define OPENSSL_EC_EXPLICIT_CURVE  0x000
 845 #  define OPENSSL_EC_NAMED_CURVE     0x001
 846
 847 EC_GROUP *d2i_ECPKParameters(EC_GROUP **, const unsigned char **in, long len);
 848 int i2d_ECPKParameters(const EC_GROUP *, unsigned char **out);
 849
 850 #  define d2i_ECPKParameters_bio(bp,x) \
 851     ASN1_d2i_bio_of(EC_GROUP, NULL, d2i_ECPKParameters, bp, x)
 852 #  define i2d_ECPKParameters_bio(bp,x) \
 853     ASN1_i2d_bio_of(EC_GROUP, i2d_ECPKParameters, bp, x)
 854 #  define d2i_ECPKParameters_fp(fp,x) \
 855     (EC_GROUP *)ASN1_d2i_fp(NULL, (char *(*)())d2i_ECPKParameters, (fp), \
 856                             (unsigned char **)(x))
 857 #  define i2d_ECPKParameters_fp(fp,x) \
 858     ASN1_i2d_fp(i2d_ECPKParameters,(fp), (unsigned char *)(x))
 859
 860 int ECPKParameters_print(BIO *bp, const EC_GROUP *x, int off);
 861 #  ifndef OPENSSL_NO_STDIO
 862 int ECPKParameters_print_fp(FILE *fp, const EC_GROUP *x, int off);
 863 #  endif
 864
 865 /********************************************************************/
 866 /*                      EC_KEY functions                            */
 867 /********************************************************************/
 868
 869 /* some values for the encoding_flag */
 870 #  define EC_PKEY_NO_PARAMETERS   0x001
 871 #  define EC_PKEY_NO_PUBKEY       0x002
 872
 873 /* some values for the flags field */
 874 #  define EC_FLAG_NON_FIPS_ALLOW  0x1
 875 #  define EC_FLAG_FIPS_CHECKED    0x2
 876 #  define EC_FLAG_COFACTOR_ECDH   0x1000
 877 #  define EC_FLAG_SM2_RANGE       0x4
 878
 879 /**
 880  *  Creates a new EC_KEY object.
 881  *  \param  ctx  The library context for to use for this EC_KEY. May be NULL in
 882  *               which case the default library context is used.
 883  *  \return EC_KEY object or NULL if an error occurred.
 884  */
 885 EC_KEY *EC_KEY_new_ex(OPENSSL_CTX *ctx, const char *propq);
 886
 887 /**
 888  *  Creates a new EC_KEY object. Same as calling EC_KEY_new_ex with a
 889  *  NULL library context
 890  *  \return EC_KEY object or NULL if an error occurred.
 891  */
 892 EC_KEY *EC_KEY_new(void);
 893
 894 int EC_KEY_get_flags(const EC_KEY *key);
 895
 896 void EC_KEY_set_flags(EC_KEY *key, int flags);
 897
 898 void EC_KEY_clear_flags(EC_KEY *key, int flags);
 899
 900 int EC_KEY_decoded_from_explicit_params(const EC_KEY *key);
 901
 902 /**
 903  *  Creates a new EC_KEY object using a named curve as underlying
 904  *  EC_GROUP object.
 905  *  \param  ctx   The library context for to use for this EC_KEY. May be NULL in
 906  *                which case the default library context is used.
 907  *  \param  propq Any property query string
 908  *  \param  nid   NID of the named curve.
 909  *  \return EC_KEY object or NULL if an error occurred.
 910  */
 911 EC_KEY *EC_KEY_new_by_curve_name_ex(OPENSSL_CTX *ctx, const char *propq,
 912                                     int nid);
 913
 914 /**
 915  *  Creates a new EC_KEY object using a named curve as underlying
 916  *  EC_GROUP object. Same as calling EC_KEY_new_by_curve_name_ex with a NULL
 917  *  library context and property query string.
 918  *  \param  nid  NID of the named curve.
 919  *  \return EC_KEY object or NULL if an error occurred.
 920  */
 921 EC_KEY *EC_KEY_new_by_curve_name(int nid);
 922
 923
 924 /** Frees a EC_KEY object.
 925  *  \param  key  EC_KEY object to be freed.
 926  */
 927 void EC_KEY_free(EC_KEY *key);
 928
 929 /** Copies a EC_KEY object.
 930  *  \param  dst  destination EC_KEY object
 931  *  \param  src  src EC_KEY object
 932  *  \return dst or NULL if an error occurred.
 933  */
 934 EC_KEY *EC_KEY_copy(EC_KEY *dst, const EC_KEY *src);
 935
 936 /** Creates a new EC_KEY object and copies the content from src to it.
 937  *  \param  src  the source EC_KEY object
 938  *  \return newly created EC_KEY object or NULL if an error occurred.
 939  */
 940 EC_KEY *EC_KEY_dup(const EC_KEY *src);
 941
 942 /** Increases the internal reference count of a EC_KEY object.
 943  *  \param  key  EC_KEY object
 944  *  \return 1 on success and 0 if an error occurred.
 945  */
 946 int EC_KEY_up_ref(EC_KEY *key);
 947
 948 /** Returns the ENGINE object of a EC_KEY object
 949  *  \param  eckey  EC_KEY object
 950  *  \return the ENGINE object (possibly NULL).
 951  */
 952 ENGINE *EC_KEY_get0_engine(const EC_KEY *eckey);
 953
 954 /** Returns the EC_GROUP object of a EC_KEY object
 955  *  \param  key  EC_KEY object
 956  *  \return the EC_GROUP object (possibly NULL).
 957  */
 958 const EC_GROUP *EC_KEY_get0_group(const EC_KEY *key);
 959
 960 /** Sets the EC_GROUP of a EC_KEY object.
 961  *  \param  key    EC_KEY object
 962  *  \param  group  EC_GROUP to use in the EC_KEY object (note: the EC_KEY
 963  *                 object will use an own copy of the EC_GROUP).
 964  *  \return 1 on success and 0 if an error occurred.
 965  */
 966 int EC_KEY_set_group(EC_KEY *key, const EC_GROUP *group);
 967
 968 /** Returns the private key of a EC_KEY object.
 969  *  \param  key  EC_KEY object
 970  *  \return a BIGNUM with the private key (possibly NULL).
 971  */
 972 const BIGNUM *EC_KEY_get0_private_key(const EC_KEY *key);
 973
 974 /** Sets the private key of a EC_KEY object.
 975  *  \param  key  EC_KEY object
 976  *  \param  prv  BIGNUM with the private key (note: the EC_KEY object
 977  *               will use an own copy of the BIGNUM).
 978  *  \return 1 on success and 0 if an error occurred.
 979  */
 980 int EC_KEY_set_private_key(EC_KEY *key, const BIGNUM *prv);
 981
 982 /** Returns the public key of a EC_KEY object.
 983  *  \param  key  the EC_KEY object
 984  *  \return a EC_POINT object with the public key (possibly NULL)
 985  */
 986 const EC_POINT *EC_KEY_get0_public_key(const EC_KEY *key);
 987
 988 /** Sets the public key of a EC_KEY object.
 989  *  \param  key  EC_KEY object
 990  *  \param  pub  EC_POINT object with the public key (note: the EC_KEY object
 991  *               will use an own copy of the EC_POINT object).
 992  *  \return 1 on success and 0 if an error occurred.
 993  */
 994 int EC_KEY_set_public_key(EC_KEY *key, const EC_POINT *pub);
 995
 996 unsigned EC_KEY_get_enc_flags(const EC_KEY *key);
 997 void EC_KEY_set_enc_flags(EC_KEY *eckey, unsigned int flags);
 998 point_conversion_form_t EC_KEY_get_conv_form(const EC_KEY *key);
 999 void EC_KEY_set_conv_form(EC_KEY *eckey, point_conversion_form_t cform);
1000
1001 # define EC_KEY_get_ex_new_index(l, p, newf, dupf, freef) \
1002     CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_EC_KEY, l, p, newf, dupf, freef)
1003 int EC_KEY_set_ex_data(EC_KEY *key, int idx, void *arg);
1004 void *EC_KEY_get_ex_data(const EC_KEY *key, int idx);
1005
1006 /* wrapper functions for the underlying EC_GROUP object */
1007 void EC_KEY_set_asn1_flag(EC_KEY *eckey, int asn1_flag);
1008
1009 /** Creates a table of pre-computed multiples of the generator to
1010  *  accelerate further EC_KEY operations.
1011  *  \param  key  EC_KEY object
1012  *  \param  ctx  BN_CTX object (optional)
1013  *  \return 1 on success and 0 if an error occurred.
1014  */
1015 DEPRECATEDIN_3_0(int EC_KEY_precompute_mult(EC_KEY *key, BN_CTX *ctx))
1016
1017 /** Creates a new ec private (and optional a new public) key.
1018  *  \param  key  EC_KEY object
1019  *  \return 1 on success and 0 if an error occurred.
1020  */
1021 int EC_KEY_generate_key(EC_KEY *key);
1022
1023 /** Verifies that a private and/or public key is valid.
1024  *  \param  key  the EC_KEY object
1025  *  \return 1 on success and 0 otherwise.
1026  */
1027 int EC_KEY_check_key(const EC_KEY *key);
1028
1029 /** Indicates if an EC_KEY can be used for signing.
1030  *  \param  eckey  the EC_KEY object
1031  *  \return 1 if can can sign and 0 otherwise.
1032  */
1033 int EC_KEY_can_sign(const EC_KEY *eckey);
1034
1035 /** Sets a public key from affine coordinates performing
1036  *  necessary NIST PKV tests.
1037  *  \param  key  the EC_KEY object
1038  *  \param  x    public key x coordinate
1039  *  \param  y    public key y coordinate
1040  *  \return 1 on success and 0 otherwise.
1041  */
1042 int EC_KEY_set_public_key_affine_coordinates(EC_KEY *key, BIGNUM *x,
1043                                              BIGNUM *y);
1044
1045 /** Encodes an EC_KEY public key to an allocated octet string
1046  *  \param  key    key to encode
1047  *  \param  form   point conversion form
1048  *  \param  pbuf   returns pointer to allocated buffer
1049  *  \param  ctx    BN_CTX object (optional)
1050  *  \return the length of the encoded octet string or 0 if an error occurred
1051  */
1052 size_t EC_KEY_key2buf(const EC_KEY *key, point_conversion_form_t form,
1053                       unsigned char **pbuf, BN_CTX *ctx);
1054
1055 /** Decodes a EC_KEY public key from a octet string
1056  *  \param  key    key to decode
1057  *  \param  buf    memory buffer with the encoded ec point
1058  *  \param  len    length of the encoded ec point
1059  *  \param  ctx    BN_CTX object (optional)
1060  *  \return 1 on success and 0 if an error occurred
1061  */
1062
1063 int EC_KEY_oct2key(EC_KEY *key, const unsigned char *buf, size_t len,
1064                    BN_CTX *ctx);
1065
1066 /** Decodes an EC_KEY private key from an octet string
1067  *  \param  key    key to decode
1068  *  \param  buf    memory buffer with the encoded private key
1069  *  \param  len    length of the encoded key
1070  *  \return 1 on success and 0 if an error occurred
1071  */
1072
1073 int EC_KEY_oct2priv(EC_KEY *key, const unsigned char *buf, size_t len);
1074
1075 /** Encodes a EC_KEY private key to an octet string
1076  *  \param  key    key to encode
1077  *  \param  buf    memory buffer for the result. If NULL the function returns
1078  *                 required buffer size.
1079  *  \param  len    length of the memory buffer
1080  *  \return the length of the encoded octet string or 0 if an error occurred
1081  */
1082
1083 size_t EC_KEY_priv2oct(const EC_KEY *key, unsigned char *buf, size_t len);
1084
1085 /** Encodes an EC_KEY private key to an allocated octet string
1086  *  \param  eckey  key to encode
1087  *  \param  pbuf   returns pointer to allocated buffer
1088  *  \return the length of the encoded octet string or 0 if an error occurred
1089  */
1090 size_t EC_KEY_priv2buf(const EC_KEY *eckey, unsigned char **pbuf);
1091
1092 /********************************************************************/
1093 /*        de- and encoding functions for SEC1 ECPrivateKey          */
1094 /********************************************************************/
1095
1096 /** Decodes a private key from a memory buffer.
1097  *  \param  key  a pointer to a EC_KEY object which should be used (or NULL)
1098  *  \param  in   pointer to memory with the DER encoded private key
1099  *  \param  len  length of the DER encoded private key
1100  *  \return the decoded private key or NULL if an error occurred.
1101  */
1102 EC_KEY *d2i_ECPrivateKey(EC_KEY **key, const unsigned char **in, long len);
1103
1104 /** Encodes a private key object and stores the result in a buffer.
1105  *  \param  key  the EC_KEY object to encode
1106  *  \param  out  the buffer for the result (if NULL the function returns number
1107  *               of bytes needed).
1108  *  \return 1 on success and 0 if an error occurred.
1109  */
1110 int i2d_ECPrivateKey(const EC_KEY *key, unsigned char **out);
1111
1112 /********************************************************************/
1113 /*        de- and encoding functions for EC parameters              */
1114 /********************************************************************/
1115
1116 /** Decodes ec parameter from a memory buffer.
1117  *  \param  key  a pointer to a EC_KEY object which should be used (or NULL)
1118  *  \param  in   pointer to memory with the DER encoded ec parameters
1119  *  \param  len  length of the DER encoded ec parameters
1120  *  \return a EC_KEY object with the decoded parameters or NULL if an error
1121  *          occurred.
1122  */
1123 EC_KEY *d2i_ECParameters(EC_KEY **key, const unsigned char **in, long len);
1124
1125 /** Encodes ec parameter and stores the result in a buffer.
1126  *  \param  key  the EC_KEY object with ec parameters to encode
1127  *  \param  out  the buffer for the result (if NULL the function returns number
1128  *               of bytes needed).
1129  *  \return 1 on success and 0 if an error occurred.
1130  */
1131 int i2d_ECParameters(const EC_KEY *key, unsigned char **out);
1132
1133 /********************************************************************/
1134 /*         de- and encoding functions for EC public key             */
1135 /*         (octet string, not DER -- hence 'o2i' and 'i2o')         */
1136 /********************************************************************/
1137
1138 /** Decodes a ec public key from a octet string.
1139  *  \param  key  a pointer to a EC_KEY object which should be used
1140  *  \param  in   memory buffer with the encoded public key
1141  *  \param  len  length of the encoded public key
1142  *  \return EC_KEY object with decoded public key or NULL if an error
1143  *          occurred.
1144  */
1145 EC_KEY *o2i_ECPublicKey(EC_KEY **key, const unsigned char **in, long len);
1146
1147 /** Encodes a ec public key in an octet string.
1148  *  \param  key  the EC_KEY object with the public key
1149  *  \param  out  the buffer for the result (if NULL the function returns number
1150  *               of bytes needed).
1151  *  \return 1 on success and 0 if an error occurred
1152  */
1153 int i2o_ECPublicKey(const EC_KEY *key, unsigned char **out);
1154
1155 /** Prints out the ec parameters on human readable form.
1156  *  \param  bp   BIO object to which the information is printed
1157  *  \param  key  EC_KEY object
1158  *  \return 1 on success and 0 if an error occurred
1159  */
1160 int ECParameters_print(BIO *bp, const EC_KEY *key);
1161
1162 /** Prints out the contents of a EC_KEY object
1163  *  \param  bp   BIO object to which the information is printed
1164  *  \param  key  EC_KEY object
1165  *  \param  off  line offset
1166  *  \return 1 on success and 0 if an error occurred
1167  */
1168 int EC_KEY_print(BIO *bp, const EC_KEY *key, int off);
1169
1170 #  ifndef OPENSSL_NO_STDIO
1171 /** Prints out the ec parameters on human readable form.
1172  *  \param  fp   file descriptor to which the information is printed
1173  *  \param  key  EC_KEY object
1174  *  \return 1 on success and 0 if an error occurred
1175  */
1176 int ECParameters_print_fp(FILE *fp, const EC_KEY *key);
1177
1178 /** Prints out the contents of a EC_KEY object
1179  *  \param  fp   file descriptor to which the information is printed
1180  *  \param  key  EC_KEY object
1181  *  \param  off  line offset
1182  *  \return 1 on success and 0 if an error occurred
1183  */
1184 int EC_KEY_print_fp(FILE *fp, const EC_KEY *key, int off);
1185
1186 #  endif
1187
1188 const EC_KEY_METHOD *EC_KEY_OpenSSL(void);
1189 const EC_KEY_METHOD *EC_KEY_get_default_method(void);
1190 void EC_KEY_set_default_method(const EC_KEY_METHOD *meth);
1191 const EC_KEY_METHOD *EC_KEY_get_method(const EC_KEY *key);
1192 int EC_KEY_set_method(EC_KEY *key, const EC_KEY_METHOD *meth);
1193 EC_KEY *EC_KEY_new_method(ENGINE *engine);
1194
1195 /** The old name for ecdh_KDF_X9_63
1196  *  The ECDH KDF specification has been mistakingly attributed to ANSI X9.62,
1197  *  it is actually specified in ANSI X9.63.
1198  *  This identifier is retained for backwards compatibility
1199  */
1200 DEPRECATEDIN_3_0(int ECDH_KDF_X9_62(unsigned char *out, size_t outlen,
1201                                     const unsigned char *Z, size_t Zlen,
1202                                     const unsigned char *sinfo, size_t sinfolen,
1203                                     const EVP_MD *md))
1204
1205 DEPRECATEDIN_3_0(int ECDH_compute_key(void *out, size_t outlen,
1206                                       const EC_POINT *pub_key,
1207                                       const EC_KEY *ecdh,
1208                                       void *(*KDF)(const void *in, size_t inlen,
1209                                                    void *out, size_t *outlen)))
1210
1211 typedef struct ECDSA_SIG_st ECDSA_SIG;
1212
1213 /** Allocates and initialize a ECDSA_SIG structure
1214  *  \return pointer to a ECDSA_SIG structure or NULL if an error occurred
1215  */
1216 ECDSA_SIG *ECDSA_SIG_new(void);
1217
1218 /** frees a ECDSA_SIG structure
1219  *  \param  sig  pointer to the ECDSA_SIG structure
1220  */
1221 void ECDSA_SIG_free(ECDSA_SIG *sig);
1222
1223 /** i2d_ECDSA_SIG encodes content of ECDSA_SIG (note: this function modifies *pp
1224  *  (*pp += length of the DER encoded signature)).
1225  *  \param  sig  pointer to the ECDSA_SIG object
1226  *  \param  pp   pointer to a unsigned char pointer for the output or NULL
1227  *  \return the length of the DER encoded ECDSA_SIG object or a negative value
1228  *          on error
1229  */
1230 DECLARE_ASN1_ENCODE_FUNCTIONS_only(ECDSA_SIG, ECDSA_SIG)
1231
1232 /** d2i_ECDSA_SIG decodes an ECDSA signature (note: this function modifies *pp
1233  *  (*pp += len)).
1234  *  \param  sig  pointer to ECDSA_SIG pointer (may be NULL)
1235  *  \param  pp   memory buffer with the DER encoded signature
1236  *  \param  len  length of the buffer
1237  *  \return pointer to the decoded ECDSA_SIG structure (or NULL)
1238  */
1239
1240 /** Accessor for r and s fields of ECDSA_SIG
1241  *  \param  sig  pointer to ECDSA_SIG structure
1242  *  \param  pr   pointer to BIGNUM pointer for r (may be NULL)
1243  *  \param  ps   pointer to BIGNUM pointer for s (may be NULL)
1244  */
1245 void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps);
1246
1247 /** Accessor for r field of ECDSA_SIG
1248  *  \param  sig  pointer to ECDSA_SIG structure
1249  */
1250 const BIGNUM *ECDSA_SIG_get0_r(const ECDSA_SIG *sig);
1251
1252 /** Accessor for s field of ECDSA_SIG
1253  *  \param  sig  pointer to ECDSA_SIG structure
1254  */
1255 const BIGNUM *ECDSA_SIG_get0_s(const ECDSA_SIG *sig);
1256
1257 /** Setter for r and s fields of ECDSA_SIG
1258  *  \param  sig  pointer to ECDSA_SIG structure
1259  *  \param  r    pointer to BIGNUM for r (may be NULL)
1260  *  \param  s    pointer to BIGNUM for s (may be NULL)
1261  */
1262 int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s);
1263
1264 /** Computes the ECDSA signature of the given hash value using
1265  *  the supplied private key and returns the created signature.
1266  *  \param  dgst      pointer to the hash value
1267  *  \param  dgst_len  length of the hash value
1268  *  \param  eckey     EC_KEY object containing a private EC key
1269  *  \return pointer to a ECDSA_SIG structure or NULL if an error occurred
1270  */
1271 DEPRECATEDIN_3_0(ECDSA_SIG *ECDSA_do_sign(const unsigned char *dgst,
1272                                           int dgst_len, EC_KEY *eckey))
1273
1274 /** Computes ECDSA signature of a given hash value using the supplied
1275  *  private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
1276  *  \param  dgst     pointer to the hash value to sign
1277  *  \param  dgstlen  length of the hash value
1278  *  \param  kinv     BIGNUM with a pre-computed inverse k (optional)
1279  *  \param  rp       BIGNUM with a pre-computed rp value (optional),
1280  *                   see ECDSA_sign_setup
1281  *  \param  eckey    EC_KEY object containing a private EC key
1282  *  \return pointer to a ECDSA_SIG structure or NULL if an error occurred
1283  */
1284 DEPRECATEDIN_3_0(ECDSA_SIG *ECDSA_do_sign_ex(const unsigned char *dgst,
1285                                              int dgstlen, const BIGNUM *kinv,
1286                                              const BIGNUM *rp, EC_KEY *eckey))
1287
1288 /** Verifies that the supplied signature is a valid ECDSA
1289  *  signature of the supplied hash value using the supplied public key.
1290  *  \param  dgst      pointer to the hash value
1291  *  \param  dgst_len  length of the hash value
1292  *  \param  sig       ECDSA_SIG structure
1293  *  \param  eckey     EC_KEY object containing a public EC key
1294  *  \return 1 if the signature is valid, 0 if the signature is invalid
1295  *          and -1 on error
1296  */
1297 DEPRECATEDIN_3_0(int ECDSA_do_verify(const unsigned char *dgst, int dgst_len,
1298                                      const ECDSA_SIG *sig, EC_KEY *eckey))
1299
1300 /** Precompute parts of the signing operation
1301  *  \param  eckey  EC_KEY object containing a private EC key
1302  *  \param  ctx    BN_CTX object (optional)
1303  *  \param  kinv   BIGNUM pointer for the inverse of k
1304  *  \param  rp     BIGNUM pointer for x coordinate of k * generator
1305  *  \return 1 on success and 0 otherwise
1306  */
1307 DEPRECATEDIN_3_0(int ECDSA_sign_setup(EC_KEY *eckey, BN_CTX *ctx,
1308                                       BIGNUM **kinv, BIGNUM **rp))
1309
1310 /** Computes ECDSA signature of a given hash value using the supplied
1311  *  private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
1312  *  \param  type     this parameter is ignored
1313  *  \param  dgst     pointer to the hash value to sign
1314  *  \param  dgstlen  length of the hash value
1315  *  \param  sig      memory for the DER encoded created signature
1316  *  \param  siglen   pointer to the length of the returned signature
1317  *  \param  eckey    EC_KEY object containing a private EC key
1318  *  \return 1 on success and 0 otherwise
1319  */
1320 DEPRECATEDIN_3_0(int ECDSA_sign(int type, const unsigned char *dgst,
1321                                 int dgstlen, unsigned char *sig,
1322                                 unsigned int *siglen, EC_KEY *eckey))
1323
1324 /** Computes ECDSA signature of a given hash value using the supplied
1325  *  private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
1326  *  \param  type     this parameter is ignored
1327  *  \param  dgst     pointer to the hash value to sign
1328  *  \param  dgstlen  length of the hash value
1329  *  \param  sig      buffer to hold the DER encoded signature
1330  *  \param  siglen   pointer to the length of the returned signature
1331  *  \param  kinv     BIGNUM with a pre-computed inverse k (optional)
1332  *  \param  rp       BIGNUM with a pre-computed rp value (optional),
1333  *                   see ECDSA_sign_setup
1334  *  \param  eckey    EC_KEY object containing a private EC key
1335  *  \return 1 on success and 0 otherwise
1336  */
1337 DEPRECATEDIN_3_0(int ECDSA_sign_ex(int type, const unsigned char *dgst,
1338                                    int dgstlen, unsigned char *sig,
1339                                    unsigned int *siglen, const BIGNUM *kinv,
1340                                    const BIGNUM *rp, EC_KEY *eckey))
1341
1342 /** Verifies that the given signature is valid ECDSA signature
1343  *  of the supplied hash value using the specified public key.
1344  *  \param  type     this parameter is ignored
1345  *  \param  dgst     pointer to the hash value
1346  *  \param  dgstlen  length of the hash value
1347  *  \param  sig      pointer to the DER encoded signature
1348  *  \param  siglen   length of the DER encoded signature
1349  *  \param  eckey    EC_KEY object containing a public EC key
1350  *  \return 1 if the signature is valid, 0 if the signature is invalid
1351  *          and -1 on error
1352  */
1353 DEPRECATEDIN_3_0(int ECDSA_verify(int type, const unsigned char *dgst,
1354                                   int dgstlen, const unsigned char *sig,
1355                                   int siglen, EC_KEY *eckey))
1356
1357 /** Returns the maximum length of the DER encoded signature
1358  *  \param  eckey  EC_KEY object
1359  *  \return numbers of bytes required for the DER encoded signature
1360  */
1361 DEPRECATEDIN_3_0(int ECDSA_size(const EC_KEY *eckey))
1362
1363 /********************************************************************/
1364 /*  EC_KEY_METHOD constructors, destructors, writers and accessors  */
1365 /********************************************************************/
1366
1367 DEPRECATEDIN_3_0(EC_KEY_METHOD *EC_KEY_METHOD_new(const EC_KEY_METHOD *meth))
1368 DEPRECATEDIN_3_0(void EC_KEY_METHOD_free(EC_KEY_METHOD *meth))
1369 DEPRECATEDIN_3_0(void EC_KEY_METHOD_set_init
1370                  (EC_KEY_METHOD *meth,
1371                   int (*init)(EC_KEY *key),
1372                   void (*finish)(EC_KEY *key),
1373                   int (*copy)(EC_KEY *dest, const EC_KEY *src),
1374                   int (*set_group)(EC_KEY *key, const EC_GROUP *grp),
1375                   int (*set_private)(EC_KEY *key,
1376                                      const BIGNUM *priv_key),
1377                   int (*set_public)(EC_KEY *key,
1378                                     const EC_POINT *pub_key)))
1379
1380 DEPRECATEDIN_3_0(void EC_KEY_METHOD_set_keygen(EC_KEY_METHOD *meth,
1381                                                int (*keygen)(EC_KEY *key)))
1382
1383 DEPRECATEDIN_3_0(void EC_KEY_METHOD_set_compute_key
1384                  (EC_KEY_METHOD *meth,
1385                   int (*ckey)(unsigned char **psec,
1386                               size_t *pseclen,
1387                               const EC_POINT *pub_key,
1388                               const EC_KEY *ecdh)))
1389
1390 DEPRECATEDIN_3_0(void EC_KEY_METHOD_set_sign
1391                  (EC_KEY_METHOD *meth,
1392                   int (*sign)(int type, const unsigned char *dgst,
1393                               int dlen, unsigned char *sig,
1394                               unsigned int *siglen,
1395                               const BIGNUM *kinv, const BIGNUM *r,
1396                               EC_KEY *eckey),
1397                   int (*sign_setup)(EC_KEY *eckey, BN_CTX *ctx_in,
1398                                     BIGNUM **kinvp, BIGNUM **rp),
1399                   ECDSA_SIG *(*sign_sig)(const unsigned char *dgst,
1400                                          int dgst_len,
1401                                          const BIGNUM *in_kinv,
1402                                          const BIGNUM *in_r,
1403                                          EC_KEY *eckey)))
1404
1405 DEPRECATEDIN_3_0(void EC_KEY_METHOD_set_verify
1406                  (EC_KEY_METHOD *meth,
1407                   int (*verify)(int type, const unsigned
1408                                 char *dgst, int dgst_len,
1409                                 const unsigned char *sigbuf,
1410                                 int sig_len, EC_KEY *eckey),
1411                   int (*verify_sig)(const unsigned char *dgst,
1412                                     int dgst_len,
1413                                     const ECDSA_SIG *sig,
1414                                     EC_KEY *eckey)))
1415
1416 DEPRECATEDIN_3_0(void EC_KEY_METHOD_get_init
1417                  (const EC_KEY_METHOD *meth,
1418                   int (**pinit)(EC_KEY *key),
1419                   void (**pfinish)(EC_KEY *key),
1420                   int (**pcopy)(EC_KEY *dest, const EC_KEY *src),
1421                   int (**pset_group)(EC_KEY *key,
1422                                      const EC_GROUP *grp),
1423                   int (**pset_private)(EC_KEY *key,
1424                                        const BIGNUM *priv_key),
1425                   int (**pset_public)(EC_KEY *key,
1426                                       const EC_POINT *pub_key)))
1427
1428 DEPRECATEDIN_3_0(void EC_KEY_METHOD_get_keygen(const EC_KEY_METHOD *meth,
1429                                                int (**pkeygen)(EC_KEY *key)))
1430
1431 DEPRECATEDIN_3_0(void EC_KEY_METHOD_get_compute_key
1432                  (const EC_KEY_METHOD *meth,
1433                   int (**pck)(unsigned char **psec,
1434                               size_t *pseclen,
1435                               const EC_POINT *pub_key,
1436                               const EC_KEY *ecdh)))
1437
1438 DEPRECATEDIN_3_0(void EC_KEY_METHOD_get_sign
1439                  (const EC_KEY_METHOD *meth,
1440                   int (**psign)(int type, const unsigned char *dgst,
1441                                 int dlen, unsigned char *sig,
1442                                 unsigned int *siglen,
1443                                 const BIGNUM *kinv, const BIGNUM *r,
1444                                 EC_KEY *eckey),
1445                   int (**psign_setup)(EC_KEY *eckey, BN_CTX *ctx_in,
1446                                       BIGNUM **kinvp, BIGNUM **rp),
1447                   ECDSA_SIG *(**psign_sig)(const unsigned char *dgst,
1448                                            int dgst_len,
1449                                            const BIGNUM *in_kinv,
1450                                            const BIGNUM *in_r,
1451                                            EC_KEY *eckey)))
1452
1453 DEPRECATEDIN_3_0(void EC_KEY_METHOD_get_verify
1454                  (const EC_KEY_METHOD *meth,
1455                   int (**pverify)(int type, const unsigned
1456                                   char *dgst, int dgst_len,
1457                                   const unsigned char *sigbuf,
1458                                   int sig_len, EC_KEY *eckey),
1459                   int (**pverify_sig)(const unsigned char *dgst,
1460                                       int dgst_len,
1461                                       const ECDSA_SIG *sig,
1462                                       EC_KEY *eckey)))
1463
1464 #  define ECParameters_dup(x) ASN1_dup_of(EC_KEY, i2d_ECParameters, \
1465                                            d2i_ECParameters, x)
1466
1467 #  ifndef __cplusplus
1468 #   if defined(__SUNPRO_C)
1469 #    if __SUNPRO_C >= 0x520
1470 #     pragma error_messages (default,E_ARRAY_OF_INCOMPLETE_NONAME,E_ARRAY_OF_INCOMPLETE)
1471 #    endif
1472 #   endif
1473 #  endif
1474
1475 int EVP_PKEY_CTX_set_ec_paramgen_curve_nid(EVP_PKEY_CTX *ctx, int nid);
1476 int EVP_PKEY_CTX_set_ec_param_enc(EVP_PKEY_CTX *ctx, int param_enc);
1477 int EVP_PKEY_CTX_set_ecdh_cofactor_mode(EVP_PKEY_CTX *ctx, int cofactor_mode);
1478 int EVP_PKEY_CTX_get_ecdh_cofactor_mode(EVP_PKEY_CTX *ctx);
1479
1480 int EVP_PKEY_CTX_set_ecdh_kdf_type(EVP_PKEY_CTX *ctx, int kdf);
1481 int EVP_PKEY_CTX_get_ecdh_kdf_type(EVP_PKEY_CTX *ctx);
1482
1483 int EVP_PKEY_CTX_set_ecdh_kdf_md(EVP_PKEY_CTX *ctx, const EVP_MD *md);
1484 int EVP_PKEY_CTX_get_ecdh_kdf_md(EVP_PKEY_CTX *ctx, const EVP_MD **md);
1485
1486 int EVP_PKEY_CTX_set_ecdh_kdf_outlen(EVP_PKEY_CTX *ctx, int len);
1487 int EVP_PKEY_CTX_get_ecdh_kdf_outlen(EVP_PKEY_CTX *ctx, int *len);
1488
1489 int EVP_PKEY_CTX_set0_ecdh_kdf_ukm(EVP_PKEY_CTX *ctx, unsigned char *ukm,
1490                                    int len);
1491 int EVP_PKEY_CTX_get0_ecdh_kdf_ukm(EVP_PKEY_CTX *ctx, unsigned char **ukm);
1492
1493 #  define EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID         (EVP_PKEY_ALG_CTRL + 1)
1494 #  define EVP_PKEY_CTRL_EC_PARAM_ENC                  (EVP_PKEY_ALG_CTRL + 2)
1495 #  define EVP_PKEY_CTRL_EC_ECDH_COFACTOR              (EVP_PKEY_ALG_CTRL + 3)
1496 #  define EVP_PKEY_CTRL_EC_KDF_TYPE                   (EVP_PKEY_ALG_CTRL + 4)
1497 #  define EVP_PKEY_CTRL_EC_KDF_MD                     (EVP_PKEY_ALG_CTRL + 5)
1498 #  define EVP_PKEY_CTRL_GET_EC_KDF_MD                 (EVP_PKEY_ALG_CTRL + 6)
1499 #  define EVP_PKEY_CTRL_EC_KDF_OUTLEN                 (EVP_PKEY_ALG_CTRL + 7)
1500 #  define EVP_PKEY_CTRL_GET_EC_KDF_OUTLEN             (EVP_PKEY_ALG_CTRL + 8)
1501 #  define EVP_PKEY_CTRL_EC_KDF_UKM                    (EVP_PKEY_ALG_CTRL + 9)
1502 #  define EVP_PKEY_CTRL_GET_EC_KDF_UKM                (EVP_PKEY_ALG_CTRL + 10)
1503
1504 /* KDF types */
1505 #  define EVP_PKEY_ECDH_KDF_NONE                      1
1506 #  define EVP_PKEY_ECDH_KDF_X9_63                     2
1507 /** The old name for EVP_PKEY_ECDH_KDF_X9_63
1508  *  The ECDH KDF specification has been mistakingly attributed to ANSI X9.62,
1509  *  it is actually specified in ANSI X9.63.
1510  *  This identifier is retained for backwards compatibility
1511  */
1512 #  define EVP_PKEY_ECDH_KDF_X9_62   EVP_PKEY_ECDH_KDF_X9_63
1513
1514 #  ifdef  __cplusplus
1515 }
1516 #  endif
1517 # endif
1518 #endif