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 typedef struct ec_method_st EC_METHOD;
  51 typedef struct ec_group_st EC_GROUP;
  52 typedef struct ec_point_st EC_POINT;
  53 typedef struct ecpk_parameters_st ECPKPARAMETERS;
  54 typedef struct ec_parameters_st ECPARAMETERS;
  55
  56 /********************************************************************/
  57 /*               EC_METHODs for curves over GF(p)                   */
  58 /********************************************************************/
  59
  60 /** Returns the basic GFp ec methods which provides the basis for the
  61  *  optimized methods.
  62  *  \return  EC_METHOD object
  63  */
  64 const EC_METHOD *EC_GFp_simple_method(void);
  65
  66 /** Returns GFp methods using montgomery multiplication.
  67  *  \return  EC_METHOD object
  68  */
  69 const EC_METHOD *EC_GFp_mont_method(void);
  70
  71 /** Returns GFp methods using optimized methods for NIST recommended curves
  72  *  \return  EC_METHOD object
  73  */
  74 const EC_METHOD *EC_GFp_nist_method(void);
  75
  76 #  ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
  77 /** Returns 64-bit optimized methods for nistp224
  78  *  \return  EC_METHOD object
  79  */
  80 const EC_METHOD *EC_GFp_nistp224_method(void);
  81
  82 /** Returns 64-bit optimized methods for nistp256
  83  *  \return  EC_METHOD object
  84  */
  85 const EC_METHOD *EC_GFp_nistp256_method(void);
  86
  87 /** Returns 64-bit optimized methods for nistp521
  88  *  \return  EC_METHOD object
  89  */
  90 const EC_METHOD *EC_GFp_nistp521_method(void);
  91 #  endif
  92
  93 #  ifndef OPENSSL_NO_EC2M
  94 /********************************************************************/
  95 /*           EC_METHOD for curves over GF(2^m)                      */
  96 /********************************************************************/
  97
  98 /** Returns the basic GF2m ec method
  99  *  \return  EC_METHOD object
 100  */
 101 const EC_METHOD *EC_GF2m_simple_method(void);
 102
 103 #  endif
 104
 105 /********************************************************************/
 106 /*                   EC_GROUP functions                             */
 107 /********************************************************************/
 108
 109 /**
 110  *  Creates a new EC_GROUP object
 111  *  \param   libctx The associated library context or NULL for the default
 112  *                  library context
 113  *  \param   meth   EC_METHOD to use
 114  *  \return  newly created EC_GROUP object or NULL in case of an error.
 115  */
 116 EC_GROUP *EC_GROUP_new_ex(OPENSSL_CTX *libctx, const EC_METHOD *meth);
 117
 118 /**
 119  *  Creates a new EC_GROUP object. Same as EC_GROUP_new_ex with NULL for the
 120  *  library context.
 121  *  \param   meth   EC_METHOD to use
 122  *  \return  newly created EC_GROUP object or NULL in case of an error.
 123  */
 124 EC_GROUP *EC_GROUP_new(const EC_METHOD *meth);
 125
 126 /** Frees a EC_GROUP object
 127  *  \param  group  EC_GROUP object to be freed.
 128  */
 129 void EC_GROUP_free(EC_GROUP *group);
 130
 131 /** Clears and frees a EC_GROUP object
 132  *  \param  group  EC_GROUP object to be cleared and freed.
 133  */
 134 DEPRECATEDIN_3_0(void EC_GROUP_clear_free(EC_GROUP *group))
 135
 136 /** Copies EC_GROUP objects. Note: both EC_GROUPs must use the same EC_METHOD.
 137  *  \param  dst  destination EC_GROUP object
 138  *  \param  src  source EC_GROUP object
 139  *  \return 1 on success and 0 if an error occurred.
 140  */
 141 int EC_GROUP_copy(EC_GROUP *dst, const EC_GROUP *src);
 142
 143 /** Creates a new EC_GROUP object and copies the content
 144  *  form src to the newly created EC_KEY object
 145  *  \param  src  source EC_GROUP object
 146  *  \return newly created EC_GROUP object or NULL in case of an error.
 147  */
 148 EC_GROUP *EC_GROUP_dup(const EC_GROUP *src);
 149
 150 /** Returns the EC_METHOD of the EC_GROUP object.
 151  *  \param  group  EC_GROUP object
 152  *  \return EC_METHOD used in this EC_GROUP object.
 153  */
 154 const EC_METHOD *EC_GROUP_method_of(const EC_GROUP *group);
 155
 156 /** Returns the field type of the EC_METHOD.
 157  *  \param  meth  EC_METHOD object
 158  *  \return NID of the underlying field type OID.
 159  */
 160 int EC_METHOD_get_field_type(const EC_METHOD *meth);
 161
 162 /** Sets the generator and its order/cofactor of a EC_GROUP object.
 163  *  \param  group      EC_GROUP object
 164  *  \param  generator  EC_POINT object with the generator.
 165  *  \param  order      the order of the group generated by the generator.
 166  *  \param  cofactor   the index of the sub-group generated by the generator
 167  *                     in the group of all points on the elliptic curve.
 168  *  \return 1 on success and 0 if an error occurred
 169  */
 170 int EC_GROUP_set_generator(EC_GROUP *group, const EC_POINT *generator,
 171                            const BIGNUM *order, const BIGNUM *cofactor);
 172
 173 /** Returns the generator of a EC_GROUP object.
 174  *  \param  group  EC_GROUP object
 175  *  \return the currently used generator (possibly NULL).
 176  */
 177 const EC_POINT *EC_GROUP_get0_generator(const EC_GROUP *group);
 178
 179 /** Returns the montgomery data for order(Generator)
 180  *  \param  group  EC_GROUP object
 181  *  \return the currently used montgomery data (possibly NULL).
 182 */
 183 BN_MONT_CTX *EC_GROUP_get_mont_data(const EC_GROUP *group);
 184
 185 /** Gets the order of a EC_GROUP
 186  *  \param  group  EC_GROUP object
 187  *  \param  order  BIGNUM to which the order is copied
 188  *  \param  ctx    unused
 189  *  \return 1 on success and 0 if an error occurred
 190  */
 191 int EC_GROUP_get_order(const EC_GROUP *group, BIGNUM *order, BN_CTX *ctx);
 192
 193 /** Gets the order of an EC_GROUP
 194  *  \param  group  EC_GROUP object
 195  *  \return the group order
 196  */
 197 const BIGNUM *EC_GROUP_get0_order(const EC_GROUP *group);
 198
 199 /** Gets the number of bits of the order of an EC_GROUP
 200  *  \param  group  EC_GROUP object
 201  *  \return number of bits of group order.
 202  */
 203 int EC_GROUP_order_bits(const EC_GROUP *group);
 204
 205 /** Gets the cofactor of a EC_GROUP
 206  *  \param  group     EC_GROUP object
 207  *  \param  cofactor  BIGNUM to which the cofactor is copied
 208  *  \param  ctx       unused
 209  *  \return 1 on success and 0 if an error occurred
 210  */
 211 int EC_GROUP_get_cofactor(const EC_GROUP *group, BIGNUM *cofactor,
 212                           BN_CTX *ctx);
 213
 214 /** Gets the cofactor of an EC_GROUP
 215  *  \param  group  EC_GROUP object
 216  *  \return the group cofactor
 217  */
 218 const BIGNUM *EC_GROUP_get0_cofactor(const EC_GROUP *group);
 219
 220 /** Sets the name of a EC_GROUP object
 221  *  \param  group  EC_GROUP object
 222  *  \param  nid    NID of the curve name OID
 223  */
 224 void EC_GROUP_set_curve_name(EC_GROUP *group, int nid);
 225
 226 /** Returns the curve name of a EC_GROUP object
 227  *  \param  group  EC_GROUP object
 228  *  \return NID of the curve name OID or 0 if not set.
 229  */
 230 int EC_GROUP_get_curve_name(const EC_GROUP *group);
 231
 232 /** Gets the field of an EC_GROUP
 233  *  \param  group  EC_GROUP object
 234  *  \return the group field
 235  */
 236 const BIGNUM *EC_GROUP_get0_field(const EC_GROUP *group);
 237
 238 void EC_GROUP_set_asn1_flag(EC_GROUP *group, int flag);
 239 int EC_GROUP_get_asn1_flag(const EC_GROUP *group);
 240
 241 void EC_GROUP_set_point_conversion_form(EC_GROUP *group,
 242                                         point_conversion_form_t form);
 243 point_conversion_form_t EC_GROUP_get_point_conversion_form(const EC_GROUP *);
 244
 245 unsigned char *EC_GROUP_get0_seed(const EC_GROUP *x);
 246 size_t EC_GROUP_get_seed_len(const EC_GROUP *);
 247 size_t EC_GROUP_set_seed(EC_GROUP *, const unsigned char *, size_t len);
 248
 249 /** Sets the parameters of a ec curve defined by y^2 = x^3 + a*x + b (for GFp)
 250  *  or y^2 + x*y = x^3 + a*x^2 + b (for GF2m)
 251  *  \param  group  EC_GROUP object
 252  *  \param  p      BIGNUM with the prime number (GFp) or the polynomial
 253  *                 defining the underlying field (GF2m)
 254  *  \param  a      BIGNUM with parameter a of the equation
 255  *  \param  b      BIGNUM with parameter b of the equation
 256  *  \param  ctx    BN_CTX object (optional)
 257  *  \return 1 on success and 0 if an error occurred
 258  */
 259 int EC_GROUP_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a,
 260                        const BIGNUM *b, BN_CTX *ctx);
 261
 262 /** Gets the parameters of the ec curve defined by y^2 = x^3 + a*x + b (for GFp)
 263  *  or y^2 + x*y = x^3 + a*x^2 + b (for GF2m)
 264  *  \param  group  EC_GROUP object
 265  *  \param  p      BIGNUM with the prime number (GFp) or the polynomial
 266  *                 defining the underlying field (GF2m)
 267  *  \param  a      BIGNUM for parameter a of the equation
 268  *  \param  b      BIGNUM for parameter b of the equation
 269  *  \param  ctx    BN_CTX object (optional)
 270  *  \return 1 on success and 0 if an error occurred
 271  */
 272 int EC_GROUP_get_curve(const EC_GROUP *group, BIGNUM *p, BIGNUM *a, BIGNUM *b,
 273                        BN_CTX *ctx);
 274
 275 /** Sets the parameters of an ec curve. Synonym for EC_GROUP_set_curve
 276  *  \param  group  EC_GROUP object
 277  *  \param  p      BIGNUM with the prime number (GFp) or the polynomial
 278  *                 defining the underlying field (GF2m)
 279  *  \param  a      BIGNUM with parameter a of the equation
 280  *  \param  b      BIGNUM with parameter b of the equation
 281  *  \param  ctx    BN_CTX object (optional)
 282  *  \return 1 on success and 0 if an error occurred
 283  */
 284 DEPRECATEDIN_3_0(int EC_GROUP_set_curve_GFp(EC_GROUP *group, const BIGNUM *p,
 285                                           const BIGNUM *a, const BIGNUM *b,
 286                                           BN_CTX *ctx))
 287
 288 /** Gets the parameters of an ec curve. Synonym for EC_GROUP_get_curve
 289  *  \param  group  EC_GROUP object
 290  *  \param  p      BIGNUM with the prime number (GFp) or the polynomial
 291  *                 defining the underlying field (GF2m)
 292  *  \param  a      BIGNUM for parameter a of the equation
 293  *  \param  b      BIGNUM for parameter b of the equation
 294  *  \param  ctx    BN_CTX object (optional)
 295  *  \return 1 on success and 0 if an error occurred
 296  */
 297 DEPRECATEDIN_3_0(int EC_GROUP_get_curve_GFp(const EC_GROUP *group, BIGNUM *p,
 298                                           BIGNUM *a, BIGNUM *b,
 299                                           BN_CTX *ctx))
 300
 301 #  ifndef OPENSSL_NO_EC2M
 302 /** Sets the parameter of an ec curve. Synonym for EC_GROUP_set_curve
 303  *  \param  group  EC_GROUP object
 304  *  \param  p      BIGNUM with the prime number (GFp) or the polynomial
 305  *                 defining the underlying field (GF2m)
 306  *  \param  a      BIGNUM with parameter a of the equation
 307  *  \param  b      BIGNUM with parameter b of the equation
 308  *  \param  ctx    BN_CTX object (optional)
 309  *  \return 1 on success and 0 if an error occurred
 310  */
 311 DEPRECATEDIN_3_0(int EC_GROUP_set_curve_GF2m(EC_GROUP *group, const BIGNUM *p,
 312                                            const BIGNUM *a, const BIGNUM *b,
 313                                            BN_CTX *ctx))
 314
 315 /** Gets the parameters of an ec curve. Synonym for EC_GROUP_get_curve
 316  *  \param  group  EC_GROUP object
 317  *  \param  p      BIGNUM with the prime number (GFp) or the polynomial
 318  *                 defining the underlying field (GF2m)
 319  *  \param  a      BIGNUM for parameter a of the equation
 320  *  \param  b      BIGNUM for parameter b of the equation
 321  *  \param  ctx    BN_CTX object (optional)
 322  *  \return 1 on success and 0 if an error occurred
 323  */
 324 DEPRECATEDIN_3_0(int EC_GROUP_get_curve_GF2m(const EC_GROUP *group, BIGNUM *p,
 325                                            BIGNUM *a, BIGNUM *b,
 326                                            BN_CTX *ctx))
 327 #  endif
 328 /** Returns the number of bits needed to represent a field element
 329  *  \param  group  EC_GROUP object
 330  *  \return number of bits needed to represent a field element
 331  */
 332 int EC_GROUP_get_degree(const EC_GROUP *group);
 333
 334 /** Checks whether the parameter in the EC_GROUP define a valid ec group
 335  *  \param  group  EC_GROUP object
 336  *  \param  ctx    BN_CTX object (optional)
 337  *  \return 1 if group is a valid ec group and 0 otherwise
 338  */
 339 int EC_GROUP_check(const EC_GROUP *group, BN_CTX *ctx);
 340
 341 /** Checks whether the discriminant of the elliptic curve is zero or not
 342  *  \param  group  EC_GROUP object
 343  *  \param  ctx    BN_CTX object (optional)
 344  *  \return 1 if the discriminant is not zero and 0 otherwise
 345  */
 346 int EC_GROUP_check_discriminant(const EC_GROUP *group, BN_CTX *ctx);
 347
 348 /** Compares two EC_GROUP objects
 349  *  \param  a    first EC_GROUP object
 350  *  \param  b    second EC_GROUP object
 351  *  \param  ctx  BN_CTX object (optional)
 352  *  \return 0 if the groups are equal, 1 if not, or -1 on error
 353  */
 354 int EC_GROUP_cmp(const EC_GROUP *a, const EC_GROUP *b, BN_CTX *ctx);
 355
 356 /*
 357  * EC_GROUP_new_GF*() calls EC_GROUP_new() and EC_GROUP_set_GF*() after
 358  * choosing an appropriate EC_METHOD
 359  */
 360
 361 /** Creates a new EC_GROUP object with the specified parameters defined
 362  *  over GFp (defined by the equation y^2 = x^3 + a*x + b)
 363  *  \param  p    BIGNUM with the prime number
 364  *  \param  a    BIGNUM with the parameter a of the equation
 365  *  \param  b    BIGNUM with the parameter b of the equation
 366  *  \param  ctx  BN_CTX object (optional)
 367  *  \return newly created EC_GROUP object with the specified parameters
 368  */
 369 EC_GROUP *EC_GROUP_new_curve_GFp(const BIGNUM *p, const BIGNUM *a,
 370                                  const BIGNUM *b, BN_CTX *ctx);
 371 #  ifndef OPENSSL_NO_EC2M
 372 /** Creates a new EC_GROUP object with the specified parameters defined
 373  *  over GF2m (defined by the equation y^2 + x*y = x^3 + a*x^2 + b)
 374  *  \param  p    BIGNUM with the polynomial defining the underlying field
 375  *  \param  a    BIGNUM with the parameter a of the equation
 376  *  \param  b    BIGNUM with the parameter b of the equation
 377  *  \param  ctx  BN_CTX object (optional)
 378  *  \return newly created EC_GROUP object with the specified parameters
 379  */
 380 EC_GROUP *EC_GROUP_new_curve_GF2m(const BIGNUM *p, const BIGNUM *a,
 381                                   const BIGNUM *b, BN_CTX *ctx);
 382 #  endif
 383
 384 /**
 385  * Creates a EC_GROUP object with a curve specified by a NID
 386  *  \param  libctx The associated library context or NULL for the default
 387  *                 context
 388  *  \param  nid    NID of the OID of the curve name
 389  *  \return newly created EC_GROUP object with specified curve or NULL
 390  *          if an error occurred
 391  */
 392 EC_GROUP *EC_GROUP_new_by_curve_name_ex(OPENSSL_CTX *libctx, int nid);
 393
 394 /**
 395  * Creates a EC_GROUP object with a curve specified by a NID. Same as
 396  * EC_GROUP_new_by_curve_name_ex but the libctx is always NULL.
 397  *  \param  nid    NID of the OID of the curve name
 398  *  \return newly created EC_GROUP object with specified curve or NULL
 399  *          if an error occurred
 400  */
 401 EC_GROUP *EC_GROUP_new_by_curve_name(int nid);
 402
 403 /** Creates a new EC_GROUP object from an ECPARAMETERS object
 404  *  \param  params  pointer to the ECPARAMETERS object
 405  *  \return newly created EC_GROUP object with specified curve or NULL
 406  *          if an error occurred
 407  */
 408 EC_GROUP *EC_GROUP_new_from_ecparameters(const ECPARAMETERS *params);
 409
 410 /** Creates an ECPARAMETERS object for the given EC_GROUP object.
 411  *  \param  group   pointer to the EC_GROUP object
 412  *  \param  params  pointer to an existing ECPARAMETERS object or NULL
 413  *  \return pointer to the new ECPARAMETERS object or NULL
 414  *          if an error occurred.
 415  */
 416 ECPARAMETERS *EC_GROUP_get_ecparameters(const EC_GROUP *group,
 417                                         ECPARAMETERS *params);
 418
 419 /** Creates a new EC_GROUP object from an ECPKPARAMETERS object
 420  *  \param  params  pointer to an existing ECPKPARAMETERS object, or NULL
 421  *  \return newly created EC_GROUP object with specified curve, or NULL
 422  *          if an error occurred
 423  */
 424 EC_GROUP *EC_GROUP_new_from_ecpkparameters(const ECPKPARAMETERS *params);
 425
 426 /** Creates an ECPKPARAMETERS object for the given EC_GROUP object.
 427  *  \param  group   pointer to the EC_GROUP object
 428  *  \param  params  pointer to an existing ECPKPARAMETERS object or NULL
 429  *  \return pointer to the new ECPKPARAMETERS object or NULL
 430  *          if an error occurred.
 431  */
 432 ECPKPARAMETERS *EC_GROUP_get_ecpkparameters(const EC_GROUP *group,
 433                                             ECPKPARAMETERS *params);
 434
 435 /********************************************************************/
 436 /*               handling of internal curves                        */
 437 /********************************************************************/
 438
 439 typedef struct {
 440     int nid;
 441     const char *comment;
 442 } EC_builtin_curve;
 443
 444 /*
 445  * EC_builtin_curves(EC_builtin_curve *r, size_t size) returns number of all
 446  * available curves or zero if a error occurred. In case r is not zero,
 447  * nitems EC_builtin_curve structures are filled with the data of the first
 448  * nitems internal groups
 449  */
 450 size_t EC_get_builtin_curves(EC_builtin_curve *r, size_t nitems);
 451
 452 const char *EC_curve_nid2nist(int nid);
 453 int EC_curve_nist2nid(const char *name);
 454 int EC_GROUP_check_named_curve(const EC_GROUP *group, int nist_only,
 455                                BN_CTX *ctx);
 456
 457 /********************************************************************/
 458 /*                    EC_POINT functions                            */
 459 /********************************************************************/
 460
 461 /** Creates a new EC_POINT object for the specified EC_GROUP
 462  *  \param  group  EC_GROUP the underlying EC_GROUP object
 463  *  \return newly created EC_POINT object or NULL if an error occurred
 464  */
 465 EC_POINT *EC_POINT_new(const EC_GROUP *group);
 466
 467 /** Frees a EC_POINT object
 468  *  \param  point  EC_POINT object to be freed
 469  */
 470 void EC_POINT_free(EC_POINT *point);
 471
 472 /** Clears and frees a EC_POINT object
 473  *  \param  point  EC_POINT object to be cleared and freed
 474  */
 475 void EC_POINT_clear_free(EC_POINT *point);
 476
 477 /** Copies EC_POINT object
 478  *  \param  dst  destination EC_POINT object
 479  *  \param  src  source EC_POINT object
 480  *  \return 1 on success and 0 if an error occurred
 481  */
 482 int EC_POINT_copy(EC_POINT *dst, const EC_POINT *src);
 483
 484 /** Creates a new EC_POINT object and copies the content of the supplied
 485  *  EC_POINT
 486  *  \param  src    source EC_POINT object
 487  *  \param  group  underlying the EC_GROUP object
 488  *  \return newly created EC_POINT object or NULL if an error occurred
 489  */
 490 EC_POINT *EC_POINT_dup(const EC_POINT *src, const EC_GROUP *group);
 491
 492 /** Returns the EC_METHOD used in EC_POINT object
 493  *  \param  point  EC_POINT object
 494  *  \return the EC_METHOD used
 495  */
 496 const EC_METHOD *EC_POINT_method_of(const EC_POINT *point);
 497
 498 /** Sets a point to infinity (neutral element)
 499  *  \param  group  underlying EC_GROUP object
 500  *  \param  point  EC_POINT to set to infinity
 501  *  \return 1 on success and 0 if an error occurred
 502  */
 503 int EC_POINT_set_to_infinity(const EC_GROUP *group, EC_POINT *point);
 504
 505 /** Sets the jacobian projective coordinates of a EC_POINT over GFp
 506  *  \param  group  underlying EC_GROUP object
 507  *  \param  p      EC_POINT object
 508  *  \param  x      BIGNUM with the x-coordinate
 509  *  \param  y      BIGNUM with the y-coordinate
 510  *  \param  z      BIGNUM with the z-coordinate
 511  *  \param  ctx    BN_CTX object (optional)
 512  *  \return 1 on success and 0 if an error occurred
 513  */
 514 DEPRECATEDIN_3_0(int EC_POINT_set_Jprojective_coordinates_GFp(const EC_GROUP *group,
 515                                              EC_POINT *p, const BIGNUM *x,
 516                                              const BIGNUM *y, const BIGNUM *z,
 517                                              BN_CTX *ctx))
 518
 519 /** Gets the jacobian projective coordinates of a EC_POINT over GFp
 520  *  \param  group  underlying EC_GROUP object
 521  *  \param  p      EC_POINT object
 522  *  \param  x      BIGNUM for the x-coordinate
 523  *  \param  y      BIGNUM for the y-coordinate
 524  *  \param  z      BIGNUM for the z-coordinate
 525  *  \param  ctx    BN_CTX object (optional)
 526  *  \return 1 on success and 0 if an error occurred
 527  */
 528 DEPRECATEDIN_3_0(int EC_POINT_get_Jprojective_coordinates_GFp(const EC_GROUP *group,
 529                                              const EC_POINT *p, BIGNUM *x,
 530                                              BIGNUM *y, BIGNUM *z,
 531                                              BN_CTX *ctx))
 532
 533 /** Sets the affine coordinates of an EC_POINT
 534  *  \param  group  underlying EC_GROUP object
 535  *  \param  p      EC_POINT object
 536  *  \param  x      BIGNUM with the x-coordinate
 537  *  \param  y      BIGNUM with the y-coordinate
 538  *  \param  ctx    BN_CTX object (optional)
 539  *  \return 1 on success and 0 if an error occurred
 540  */
 541 int EC_POINT_set_affine_coordinates(const EC_GROUP *group, EC_POINT *p,
 542                                     const BIGNUM *x, const BIGNUM *y,
 543                                     BN_CTX *ctx);
 544
 545 /** Gets the affine coordinates of an EC_POINT.
 546  *  \param  group  underlying EC_GROUP object
 547  *  \param  p      EC_POINT object
 548  *  \param  x      BIGNUM for the x-coordinate
 549  *  \param  y      BIGNUM for the y-coordinate
 550  *  \param  ctx    BN_CTX object (optional)
 551  *  \return 1 on success and 0 if an error occurred
 552  */
 553 int EC_POINT_get_affine_coordinates(const EC_GROUP *group, const EC_POINT *p,
 554                                     BIGNUM *x, BIGNUM *y, BN_CTX *ctx);
 555
 556 /** Sets the affine coordinates of an EC_POINT. A synonym of
 557  *  EC_POINT_set_affine_coordinates
 558  *  \param  group  underlying EC_GROUP object
 559  *  \param  p      EC_POINT object
 560  *  \param  x      BIGNUM with the x-coordinate
 561  *  \param  y      BIGNUM with the y-coordinate
 562  *  \param  ctx    BN_CTX object (optional)
 563  *  \return 1 on success and 0 if an error occurred
 564  */
 565 DEPRECATEDIN_3_0(int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group,
 566                                                        EC_POINT *p,
 567                                                        const BIGNUM *x,
 568                                                        const BIGNUM *y,
 569                                                        BN_CTX *ctx))
 570
 571 /** Gets the affine coordinates of an EC_POINT. A synonym of
 572  *  EC_POINT_get_affine_coordinates
 573  *  \param  group  underlying EC_GROUP object
 574  *  \param  p      EC_POINT object
 575  *  \param  x      BIGNUM for the x-coordinate
 576  *  \param  y      BIGNUM for 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_get_affine_coordinates_GFp(const EC_GROUP *group,
 581                                                        const EC_POINT *p,
 582                                                        BIGNUM *x,
 583                                                        BIGNUM *y,
 584                                                        BN_CTX *ctx))
 585
 586 /** Sets the x9.62 compressed coordinates of a EC_POINT
 587  *  \param  group  underlying EC_GROUP object
 588  *  \param  p      EC_POINT object
 589  *  \param  x      BIGNUM with x-coordinate
 590  *  \param  y_bit  integer with the y-Bit (either 0 or 1)
 591  *  \param  ctx    BN_CTX object (optional)
 592  *  \return 1 on success and 0 if an error occurred
 593  */
 594 int EC_POINT_set_compressed_coordinates(const EC_GROUP *group, EC_POINT *p,
 595                                         const BIGNUM *x, int y_bit,
 596                                         BN_CTX *ctx);
 597
 598 /** Sets the x9.62 compressed coordinates of a EC_POINT. A synonym of
 599  *  EC_POINT_set_compressed_coordinates
 600  *  \param  group  underlying EC_GROUP object
 601  *  \param  p      EC_POINT object
 602  *  \param  x      BIGNUM with x-coordinate
 603  *  \param  y_bit  integer with the y-Bit (either 0 or 1)
 604  *  \param  ctx    BN_CTX object (optional)
 605  *  \return 1 on success and 0 if an error occurred
 606  */
 607 DEPRECATEDIN_3_0(int EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP *group,
 608                                                            EC_POINT *p,
 609                                                            const BIGNUM *x,
 610                                                            int y_bit,
 611                                                            BN_CTX *ctx))
 612 #  ifndef OPENSSL_NO_EC2M
 613 /** Sets the affine coordinates of an EC_POINT. A synonym of
 614  *  EC_POINT_set_affine_coordinates
 615  *  \param  group  underlying EC_GROUP object
 616  *  \param  p      EC_POINT object
 617  *  \param  x      BIGNUM with the x-coordinate
 618  *  \param  y      BIGNUM with the y-coordinate
 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_affine_coordinates_GF2m(const EC_GROUP *group,
 623                                                         EC_POINT *p,
 624                                                         const BIGNUM *x,
 625                                                         const BIGNUM *y,
 626                                                         BN_CTX *ctx))
 627
 628 /** Gets the affine coordinates of an EC_POINT. A synonym of
 629  *  EC_POINT_get_affine_coordinates
 630  *  \param  group  underlying EC_GROUP object
 631  *  \param  p      EC_POINT object
 632  *  \param  x      BIGNUM for the x-coordinate
 633  *  \param  y      BIGNUM for 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_get_affine_coordinates_GF2m(const EC_GROUP *group,
 638                                                         const EC_POINT *p,
 639                                                         BIGNUM *x,
 640                                                         BIGNUM *y,
 641                                                         BN_CTX *ctx))
 642
 643 /** Sets the x9.62 compressed coordinates of a EC_POINT. A synonym of
 644  *  EC_POINT_set_compressed_coordinates
 645  *  \param  group  underlying EC_GROUP object
 646  *  \param  p      EC_POINT object
 647  *  \param  x      BIGNUM with x-coordinate
 648  *  \param  y_bit  integer with the y-Bit (either 0 or 1)
 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_set_compressed_coordinates_GF2m(const EC_GROUP *group,
 653                                                             EC_POINT *p,
 654                                                             const BIGNUM *x,
 655                                                             int y_bit,
 656                                                             BN_CTX *ctx))
 657 #  endif
 658 /** Encodes a EC_POINT object to a octet string
 659  *  \param  group  underlying EC_GROUP object
 660  *  \param  p      EC_POINT object
 661  *  \param  form   point conversion form
 662  *  \param  buf    memory buffer for the result. If NULL the function returns
 663  *                 required buffer size.
 664  *  \param  len    length of the memory buffer
 665  *  \param  ctx    BN_CTX object (optional)
 666  *  \return the length of the encoded octet string or 0 if an error occurred
 667  */
 668 size_t EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *p,
 669                           point_conversion_form_t form,
 670                           unsigned char *buf, size_t len, BN_CTX *ctx);
 671
 672 /** Decodes a EC_POINT from a octet string
 673  *  \param  group  underlying EC_GROUP object
 674  *  \param  p      EC_POINT object
 675  *  \param  buf    memory buffer with the encoded ec point
 676  *  \param  len    length of the encoded ec point
 677  *  \param  ctx    BN_CTX object (optional)
 678  *  \return 1 on success and 0 if an error occurred
 679  */
 680 int EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *p,
 681                        const unsigned char *buf, size_t len, BN_CTX *ctx);
 682
 683 /** Encodes an EC_POINT object to an allocated octet string
 684  *  \param  group  underlying EC_GROUP object
 685  *  \param  point  EC_POINT object
 686  *  \param  form   point conversion form
 687  *  \param  pbuf   returns pointer to allocated buffer
 688  *  \param  ctx    BN_CTX object (optional)
 689  *  \return the length of the encoded octet string or 0 if an error occurred
 690  */
 691 size_t EC_POINT_point2buf(const EC_GROUP *group, const EC_POINT *point,
 692                           point_conversion_form_t form,
 693                           unsigned char **pbuf, BN_CTX *ctx);
 694
 695 /* other interfaces to point2oct/oct2point: */
 696 BIGNUM *EC_POINT_point2bn(const EC_GROUP *, const EC_POINT *,
 697                           point_conversion_form_t form, BIGNUM *, BN_CTX *);
 698 EC_POINT *EC_POINT_bn2point(const EC_GROUP *, const BIGNUM *,
 699                             EC_POINT *, BN_CTX *);
 700 char *EC_POINT_point2hex(const EC_GROUP *, const EC_POINT *,
 701                          point_conversion_form_t form, BN_CTX *);
 702 EC_POINT *EC_POINT_hex2point(const EC_GROUP *, const char *,
 703                              EC_POINT *, BN_CTX *);
 704
 705 /********************************************************************/
 706 /*         functions for doing EC_POINT arithmetic                  */
 707 /********************************************************************/
 708
 709 /** Computes the sum of two EC_POINT
 710  *  \param  group  underlying EC_GROUP object
 711  *  \param  r      EC_POINT object for the result (r = a + b)
 712  *  \param  a      EC_POINT object with the first summand
 713  *  \param  b      EC_POINT object with the second summand
 714  *  \param  ctx    BN_CTX object (optional)
 715  *  \return 1 on success and 0 if an error occurred
 716  */
 717 int EC_POINT_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a,
 718                  const EC_POINT *b, BN_CTX *ctx);
 719
 720 /** Computes the double of a EC_POINT
 721  *  \param  group  underlying EC_GROUP object
 722  *  \param  r      EC_POINT object for the result (r = 2 * a)
 723  *  \param  a      EC_POINT object
 724  *  \param  ctx    BN_CTX object (optional)
 725  *  \return 1 on success and 0 if an error occurred
 726  */
 727 int EC_POINT_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a,
 728                  BN_CTX *ctx);
 729
 730 /** Computes the inverse of a EC_POINT
 731  *  \param  group  underlying EC_GROUP object
 732  *  \param  a      EC_POINT object to be inverted (it's used for the result as well)
 733  *  \param  ctx    BN_CTX object (optional)
 734  *  \return 1 on success and 0 if an error occurred
 735  */
 736 int EC_POINT_invert(const EC_GROUP *group, EC_POINT *a, BN_CTX *ctx);
 737
 738 /** Checks whether the point is the neutral element of the group
 739  *  \param  group  the underlying EC_GROUP object
 740  *  \param  p      EC_POINT object
 741  *  \return 1 if the point is the neutral element and 0 otherwise
 742  */
 743 int EC_POINT_is_at_infinity(const EC_GROUP *group, const EC_POINT *p);
 744
 745 /** Checks whether the point is on the curve
 746  *  \param  group  underlying EC_GROUP object
 747  *  \param  point  EC_POINT object to check
 748  *  \param  ctx    BN_CTX object (optional)
 749  *  \return 1 if the point is on the curve, 0 if not, or -1 on error
 750  */
 751 int EC_POINT_is_on_curve(const EC_GROUP *group, const EC_POINT *point,
 752                          BN_CTX *ctx);
 753
 754 /** Compares two EC_POINTs
 755  *  \param  group  underlying EC_GROUP object
 756  *  \param  a      first EC_POINT object
 757  *  \param  b      second EC_POINT object
 758  *  \param  ctx    BN_CTX object (optional)
 759  *  \return 1 if the points are not equal, 0 if they are, or -1 on error
 760  */
 761 int EC_POINT_cmp(const EC_GROUP *group, const EC_POINT *a, const EC_POINT *b,
 762                  BN_CTX *ctx);
 763
 764 int EC_POINT_make_affine(const EC_GROUP *group, EC_POINT *point, BN_CTX *ctx);
 765 int EC_POINTs_make_affine(const EC_GROUP *group, size_t num,
 766                           EC_POINT *points[], BN_CTX *ctx);
 767
 768 /** Computes r = generator * n + sum_{i=0}^{num-1} p[i] * m[i]
 769  *  \param  group  underlying EC_GROUP object
 770  *  \param  r      EC_POINT object for the result
 771  *  \param  n      BIGNUM with the multiplier for the group generator (optional)
 772  *  \param  num    number further summands
 773  *  \param  p      array of size num of EC_POINT objects
 774  *  \param  m      array of size num of BIGNUM objects
 775  *  \param  ctx    BN_CTX object (optional)
 776  *  \return 1 on success and 0 if an error occurred
 777  */
 778 DEPRECATEDIN_3_0(int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r,
 779                                    const BIGNUM *n, size_t num,
 780                                    const EC_POINT *p[], const BIGNUM *m[],
 781                                    BN_CTX *ctx))
 782
 783 /** Computes r = generator * n + q * m
 784  *  \param  group  underlying EC_GROUP object
 785  *  \param  r      EC_POINT object for the result
 786  *  \param  n      BIGNUM with the multiplier for the group generator (optional)
 787  *  \param  q      EC_POINT object with the first factor of the second summand
 788  *  \param  m      BIGNUM with the second factor of the second summand
 789  *  \param  ctx    BN_CTX object (optional)
 790  *  \return 1 on success and 0 if an error occurred
 791  */
 792 int EC_POINT_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *n,
 793                  const EC_POINT *q, const BIGNUM *m, BN_CTX *ctx);
 794
 795 /** Stores multiples of generator for faster point multiplication
 796  *  \param  group  EC_GROUP object
 797  *  \param  ctx    BN_CTX object (optional)
 798  *  \return 1 on success and 0 if an error occurred
 799  */
 800 int EC_GROUP_precompute_mult(EC_GROUP *group, BN_CTX *ctx);
 801
 802 /** Reports whether a precomputation has been done
 803  *  \param  group  EC_GROUP object
 804  *  \return 1 if a pre-computation has been done and 0 otherwise
 805  */
 806 int EC_GROUP_have_precompute_mult(const EC_GROUP *group);
 807
 808 /********************************************************************/
 809 /*                       ASN1 stuff                                 */
 810 /********************************************************************/
 811
 812 DECLARE_ASN1_ITEM(ECPKPARAMETERS)
 813 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPKPARAMETERS)
 814 DECLARE_ASN1_ITEM(ECPARAMETERS)
 815 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
 816
 817 /*
 818  * EC_GROUP_get_basis_type() returns the NID of the basis type used to
 819  * represent the field elements
 820  */
 821 int EC_GROUP_get_basis_type(const EC_GROUP *);
 822 #  ifndef OPENSSL_NO_EC2M
 823 int EC_GROUP_get_trinomial_basis(const EC_GROUP *, unsigned int *k);
 824 int EC_GROUP_get_pentanomial_basis(const EC_GROUP *, unsigned int *k1,
 825                                    unsigned int *k2, unsigned int *k3);
 826 #  endif
 827
 828 #  define OPENSSL_EC_EXPLICIT_CURVE  0x000
 829 #  define OPENSSL_EC_NAMED_CURVE     0x001
 830
 831 EC_GROUP *d2i_ECPKParameters(EC_GROUP **, const unsigned char **in, long len);
 832 int i2d_ECPKParameters(const EC_GROUP *, unsigned char **out);
 833
 834 #  define d2i_ECPKParameters_bio(bp,x) \
 835     ASN1_d2i_bio_of(EC_GROUP, NULL, d2i_ECPKParameters, bp, x)
 836 #  define i2d_ECPKParameters_bio(bp,x) \
 837     ASN1_i2d_bio_of(EC_GROUP, i2d_ECPKParameters, bp, x)
 838 #  define d2i_ECPKParameters_fp(fp,x) \
 839     (EC_GROUP *)ASN1_d2i_fp(NULL, (char *(*)())d2i_ECPKParameters, (fp), \
 840                             (unsigned char **)(x))
 841 #  define i2d_ECPKParameters_fp(fp,x) \
 842     ASN1_i2d_fp(i2d_ECPKParameters,(fp), (unsigned char *)(x))
 843
 844 int ECPKParameters_print(BIO *bp, const EC_GROUP *x, int off);
 845 #  ifndef OPENSSL_NO_STDIO
 846 int ECPKParameters_print_fp(FILE *fp, const EC_GROUP *x, int off);
 847 #  endif
 848
 849 /********************************************************************/
 850 /*                      EC_KEY functions                            */
 851 /********************************************************************/
 852
 853 /* some values for the encoding_flag */
 854 #  define EC_PKEY_NO_PARAMETERS   0x001
 855 #  define EC_PKEY_NO_PUBKEY       0x002
 856
 857 /* some values for the flags field */
 858 #  define EC_FLAG_NON_FIPS_ALLOW  0x1
 859 #  define EC_FLAG_FIPS_CHECKED    0x2
 860 #  define EC_FLAG_COFACTOR_ECDH   0x1000
 861
 862 /**
 863  *  Creates a new EC_KEY object.
 864  *  \param  ctx  The library context for to use for this EC_KEY. May be NULL in
 865  *               which case the default library context is used.
 866  *  \return EC_KEY object or NULL if an error occurred.
 867  */
 868 EC_KEY *EC_KEY_new_ex(OPENSSL_CTX *ctx);
 869
 870 /**
 871  *  Creates a new EC_KEY object. Same as calling EC_KEY_new_ex with a NULL
 872  *  library context
 873  *  \return EC_KEY object or NULL if an error occurred.
 874  */
 875 EC_KEY *EC_KEY_new(void);
 876
 877 int EC_KEY_get_flags(const EC_KEY *key);
 878
 879 void EC_KEY_set_flags(EC_KEY *key, int flags);
 880
 881 void EC_KEY_clear_flags(EC_KEY *key, int flags);
 882
 883 /**
 884  *  Creates a new EC_KEY object using a named curve as underlying
 885  *  EC_GROUP object.
 886  *  \param  ctx  The library context for to use for this EC_KEY. May be NULL in
 887  *               which case the default library context is used.
 888  *  \param  nid  NID of the named curve.
 889  *  \return EC_KEY object or NULL if an error occurred.
 890  */
 891 EC_KEY *EC_KEY_new_by_curve_name_ex(OPENSSL_CTX *ctx, int nid);
 892
 893 /**
 894  *  Creates a new EC_KEY object using a named curve as underlying
 895  *  EC_GROUP object. Same as calling EC_KEY_new_by_curve_name_ex with a NULL
 896  *  library context.
 897  *  \param  nid  NID of the named curve.
 898  *  \return EC_KEY object or NULL if an error occurred.
 899  */
 900 EC_KEY *EC_KEY_new_by_curve_name(int nid);
 901
 902
 903 /** Frees a EC_KEY object.
 904  *  \param  key  EC_KEY object to be freed.
 905  */
 906 void EC_KEY_free(EC_KEY *key);
 907
 908 /** Copies a EC_KEY object.
 909  *  \param  dst  destination EC_KEY object
 910  *  \param  src  src EC_KEY object
 911  *  \return dst or NULL if an error occurred.
 912  */
 913 EC_KEY *EC_KEY_copy(EC_KEY *dst, const EC_KEY *src);
 914
 915 /** Creates a new EC_KEY object and copies the content from src to it.
 916  *  \param  src  the source EC_KEY object
 917  *  \return newly created EC_KEY object or NULL if an error occurred.
 918  */
 919 EC_KEY *EC_KEY_dup(const EC_KEY *src);
 920
 921 /** Increases the internal reference count of a EC_KEY object.
 922  *  \param  key  EC_KEY object
 923  *  \return 1 on success and 0 if an error occurred.
 924  */
 925 int EC_KEY_up_ref(EC_KEY *key);
 926
 927 /** Returns the ENGINE object of a EC_KEY object
 928  *  \param  eckey  EC_KEY object
 929  *  \return the ENGINE object (possibly NULL).
 930  */
 931 ENGINE *EC_KEY_get0_engine(const EC_KEY *eckey);
 932
 933 /** Returns the EC_GROUP object of a EC_KEY object
 934  *  \param  key  EC_KEY object
 935  *  \return the EC_GROUP object (possibly NULL).
 936  */
 937 const EC_GROUP *EC_KEY_get0_group(const EC_KEY *key);
 938
 939 /** Sets the EC_GROUP of a EC_KEY object.
 940  *  \param  key    EC_KEY object
 941  *  \param  group  EC_GROUP to use in the EC_KEY object (note: the EC_KEY
 942  *                 object will use an own copy of the EC_GROUP).
 943  *  \return 1 on success and 0 if an error occurred.
 944  */
 945 int EC_KEY_set_group(EC_KEY *key, const EC_GROUP *group);
 946
 947 /** Returns the private key of a EC_KEY object.
 948  *  \param  key  EC_KEY object
 949  *  \return a BIGNUM with the private key (possibly NULL).
 950  */
 951 const BIGNUM *EC_KEY_get0_private_key(const EC_KEY *key);
 952
 953 /** Sets the private key of a EC_KEY object.
 954  *  \param  key  EC_KEY object
 955  *  \param  prv  BIGNUM with the private key (note: the EC_KEY object
 956  *               will use an own copy of the BIGNUM).
 957  *  \return 1 on success and 0 if an error occurred.
 958  */
 959 int EC_KEY_set_private_key(EC_KEY *key, const BIGNUM *prv);
 960
 961 /** Returns the public key of a EC_KEY object.
 962  *  \param  key  the EC_KEY object
 963  *  \return a EC_POINT object with the public key (possibly NULL)
 964  */
 965 const EC_POINT *EC_KEY_get0_public_key(const EC_KEY *key);
 966
 967 /** Sets the public key of a EC_KEY object.
 968  *  \param  key  EC_KEY object
 969  *  \param  pub  EC_POINT object with the public key (note: the EC_KEY object
 970  *               will use an own copy of the EC_POINT object).
 971  *  \return 1 on success and 0 if an error occurred.
 972  */
 973 int EC_KEY_set_public_key(EC_KEY *key, const EC_POINT *pub);
 974
 975 unsigned EC_KEY_get_enc_flags(const EC_KEY *key);
 976 void EC_KEY_set_enc_flags(EC_KEY *eckey, unsigned int flags);
 977 point_conversion_form_t EC_KEY_get_conv_form(const EC_KEY *key);
 978 void EC_KEY_set_conv_form(EC_KEY *eckey, point_conversion_form_t cform);
 979
 980 # define EC_KEY_get_ex_new_index(l, p, newf, dupf, freef) \
 981     CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_EC_KEY, l, p, newf, dupf, freef)
 982 int EC_KEY_set_ex_data(EC_KEY *key, int idx, void *arg);
 983 void *EC_KEY_get_ex_data(const EC_KEY *key, int idx);
 984
 985 /* wrapper functions for the underlying EC_GROUP object */
 986 void EC_KEY_set_asn1_flag(EC_KEY *eckey, int asn1_flag);
 987
 988 /** Creates a table of pre-computed multiples of the generator to
 989  *  accelerate further EC_KEY operations.
 990  *  \param  key  EC_KEY object
 991  *  \param  ctx  BN_CTX object (optional)
 992  *  \return 1 on success and 0 if an error occurred.
 993  */
 994 int EC_KEY_precompute_mult(EC_KEY *key, BN_CTX *ctx);
 995
 996 /** Creates a new ec private (and optional a new public) key.
 997  *  \param  key  EC_KEY object
 998  *  \return 1 on success and 0 if an error occurred.
 999  */
1000 int EC_KEY_generate_key(EC_KEY *key);
1001
1002 /** Verifies that a private and/or public key is valid.
1003  *  \param  key  the EC_KEY object
1004  *  \return 1 on success and 0 otherwise.
1005  */
1006 int EC_KEY_check_key(const EC_KEY *key);
1007
1008 /** Indicates if an EC_KEY can be used for signing.
1009  *  \param  eckey  the EC_KEY object
1010  *  \return 1 if can can sign and 0 otherwise.
1011  */
1012 int EC_KEY_can_sign(const EC_KEY *eckey);
1013
1014 /** Sets a public key from affine coordinates performing
1015  *  necessary NIST PKV tests.
1016  *  \param  key  the EC_KEY object
1017  *  \param  x    public key x coordinate
1018  *  \param  y    public key y coordinate
1019  *  \return 1 on success and 0 otherwise.
1020  */
1021 int EC_KEY_set_public_key_affine_coordinates(EC_KEY *key, BIGNUM *x,
1022                                              BIGNUM *y);
1023
1024 /** Encodes an EC_KEY public key to an allocated octet string
1025  *  \param  key    key to encode
1026  *  \param  form   point conversion form
1027  *  \param  pbuf   returns pointer to allocated buffer
1028  *  \param  ctx    BN_CTX object (optional)
1029  *  \return the length of the encoded octet string or 0 if an error occurred
1030  */
1031 size_t EC_KEY_key2buf(const EC_KEY *key, point_conversion_form_t form,
1032                       unsigned char **pbuf, BN_CTX *ctx);
1033
1034 /** Decodes a EC_KEY public key from a octet string
1035  *  \param  key    key to decode
1036  *  \param  buf    memory buffer with the encoded ec point
1037  *  \param  len    length of the encoded ec point
1038  *  \param  ctx    BN_CTX object (optional)
1039  *  \return 1 on success and 0 if an error occurred
1040  */
1041
1042 int EC_KEY_oct2key(EC_KEY *key, const unsigned char *buf, size_t len,
1043                    BN_CTX *ctx);
1044
1045 /** Decodes an EC_KEY private key from an octet string
1046  *  \param  key    key to decode
1047  *  \param  buf    memory buffer with the encoded private key
1048  *  \param  len    length of the encoded key
1049  *  \return 1 on success and 0 if an error occurred
1050  */
1051
1052 int EC_KEY_oct2priv(EC_KEY *key, const unsigned char *buf, size_t len);
1053
1054 /** Encodes a EC_KEY private key to an octet string
1055  *  \param  key    key to encode
1056  *  \param  buf    memory buffer for the result. If NULL the function returns
1057  *                 required buffer size.
1058  *  \param  len    length of the memory buffer
1059  *  \return the length of the encoded octet string or 0 if an error occurred
1060  */
1061
1062 size_t EC_KEY_priv2oct(const EC_KEY *key, unsigned char *buf, size_t len);
1063
1064 /** Encodes an EC_KEY private key to an allocated octet string
1065  *  \param  eckey  key to encode
1066  *  \param  pbuf   returns pointer to allocated buffer
1067  *  \return the length of the encoded octet string or 0 if an error occurred
1068  */
1069 size_t EC_KEY_priv2buf(const EC_KEY *eckey, unsigned char **pbuf);
1070
1071 /********************************************************************/
1072 /*        de- and encoding functions for SEC1 ECPrivateKey          */
1073 /********************************************************************/
1074
1075 /** Decodes a private key from a memory buffer.
1076  *  \param  key  a pointer to a EC_KEY object which should be used (or NULL)
1077  *  \param  in   pointer to memory with the DER encoded private key
1078  *  \param  len  length of the DER encoded private key
1079  *  \return the decoded private key or NULL if an error occurred.
1080  */
1081 EC_KEY *d2i_ECPrivateKey(EC_KEY **key, const unsigned char **in, long len);
1082
1083 /** Encodes a private key object and stores the result in a buffer.
1084  *  \param  key  the EC_KEY object to encode
1085  *  \param  out  the buffer for the result (if NULL the function returns number
1086  *               of bytes needed).
1087  *  \return 1 on success and 0 if an error occurred.
1088  */
1089 int i2d_ECPrivateKey(const EC_KEY *key, unsigned char **out);
1090
1091 /********************************************************************/
1092 /*        de- and encoding functions for EC parameters              */
1093 /********************************************************************/
1094
1095 /** Decodes ec parameter from a memory buffer.
1096  *  \param  key  a pointer to a EC_KEY object which should be used (or NULL)
1097  *  \param  in   pointer to memory with the DER encoded ec parameters
1098  *  \param  len  length of the DER encoded ec parameters
1099  *  \return a EC_KEY object with the decoded parameters or NULL if an error
1100  *          occurred.
1101  */
1102 EC_KEY *d2i_ECParameters(EC_KEY **key, const unsigned char **in, long len);
1103
1104 /** Encodes ec parameter and stores the result in a buffer.
1105  *  \param  key  the EC_KEY object with ec parameters 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_ECParameters(const EC_KEY *key, unsigned char **out);
1111
1112 /********************************************************************/
1113 /*         de- and encoding functions for EC public key             */
1114 /*         (octet string, not DER -- hence 'o2i' and 'i2o')         */
1115 /********************************************************************/
1116
1117 /** Decodes a ec public key from a octet string.
1118  *  \param  key  a pointer to a EC_KEY object which should be used
1119  *  \param  in   memory buffer with the encoded public key
1120  *  \param  len  length of the encoded public key
1121  *  \return EC_KEY object with decoded public key or NULL if an error
1122  *          occurred.
1123  */
1124 EC_KEY *o2i_ECPublicKey(EC_KEY **key, const unsigned char **in, long len);
1125
1126 /** Encodes a ec public key in an octet string.
1127  *  \param  key  the EC_KEY object with the public key
1128  *  \param  out  the buffer for the result (if NULL the function returns number
1129  *               of bytes needed).
1130  *  \return 1 on success and 0 if an error occurred
1131  */
1132 int i2o_ECPublicKey(const EC_KEY *key, unsigned char **out);
1133
1134 /** Prints out the ec parameters on human readable form.
1135  *  \param  bp   BIO object to which the information is printed
1136  *  \param  key  EC_KEY object
1137  *  \return 1 on success and 0 if an error occurred
1138  */
1139 int ECParameters_print(BIO *bp, const EC_KEY *key);
1140
1141 /** Prints out the contents of a EC_KEY object
1142  *  \param  bp   BIO object to which the information is printed
1143  *  \param  key  EC_KEY object
1144  *  \param  off  line offset
1145  *  \return 1 on success and 0 if an error occurred
1146  */
1147 int EC_KEY_print(BIO *bp, const EC_KEY *key, int off);
1148
1149 #  ifndef OPENSSL_NO_STDIO
1150 /** Prints out the ec parameters on human readable form.
1151  *  \param  fp   file descriptor to which the information is printed
1152  *  \param  key  EC_KEY object
1153  *  \return 1 on success and 0 if an error occurred
1154  */
1155 int ECParameters_print_fp(FILE *fp, const EC_KEY *key);
1156
1157 /** Prints out the contents of a EC_KEY object
1158  *  \param  fp   file descriptor to which the information is printed
1159  *  \param  key  EC_KEY object
1160  *  \param  off  line offset
1161  *  \return 1 on success and 0 if an error occurred
1162  */
1163 int EC_KEY_print_fp(FILE *fp, const EC_KEY *key, int off);
1164
1165 #  endif
1166
1167 const EC_KEY_METHOD *EC_KEY_OpenSSL(void);
1168 const EC_KEY_METHOD *EC_KEY_get_default_method(void);
1169 void EC_KEY_set_default_method(const EC_KEY_METHOD *meth);
1170 const EC_KEY_METHOD *EC_KEY_get_method(const EC_KEY *key);
1171 int EC_KEY_set_method(EC_KEY *key, const EC_KEY_METHOD *meth);
1172 EC_KEY *EC_KEY_new_method(ENGINE *engine);
1173
1174 /** The old name for ecdh_KDF_X9_63
1175  *  The ECDH KDF specification has been mistakingly attributed to ANSI X9.62,
1176  *  it is actually specified in ANSI X9.63.
1177  *  This identifier is retained for backwards compatibility
1178  */
1179 DEPRECATEDIN_3_0(int ECDH_KDF_X9_62(unsigned char *out, size_t outlen,
1180                                     const unsigned char *Z, size_t Zlen,
1181                                     const unsigned char *sinfo, size_t sinfolen,
1182                                     const EVP_MD *md))
1183
1184 DEPRECATEDIN_3_0(int ECDH_compute_key(void *out, size_t outlen,
1185                                       const EC_POINT *pub_key,
1186                                       const EC_KEY *ecdh,
1187                                       void *(*KDF)(const void *in, size_t inlen,
1188                                                    void *out, size_t *outlen)))
1189
1190 typedef struct ECDSA_SIG_st ECDSA_SIG;
1191
1192 /** Allocates and initialize a ECDSA_SIG structure
1193  *  \return pointer to a ECDSA_SIG structure or NULL if an error occurred
1194  */
1195 ECDSA_SIG *ECDSA_SIG_new(void);
1196
1197 /** frees a ECDSA_SIG structure
1198  *  \param  sig  pointer to the ECDSA_SIG structure
1199  */
1200 void ECDSA_SIG_free(ECDSA_SIG *sig);
1201
1202 /** i2d_ECDSA_SIG encodes content of ECDSA_SIG (note: this function modifies *pp
1203  *  (*pp += length of the DER encoded signature)).
1204  *  \param  sig  pointer to the ECDSA_SIG object
1205  *  \param  pp   pointer to a unsigned char pointer for the output or NULL
1206  *  \return the length of the DER encoded ECDSA_SIG object or a negative value
1207  *          on error
1208  */
1209 DECLARE_ASN1_ENCODE_FUNCTIONS_only(ECDSA_SIG, ECDSA_SIG)
1210
1211 /** d2i_ECDSA_SIG decodes an ECDSA signature (note: this function modifies *pp
1212  *  (*pp += len)).
1213  *  \param  sig  pointer to ECDSA_SIG pointer (may be NULL)
1214  *  \param  pp   memory buffer with the DER encoded signature
1215  *  \param  len  length of the buffer
1216  *  \return pointer to the decoded ECDSA_SIG structure (or NULL)
1217  */
1218
1219 /** Accessor for r and s fields of ECDSA_SIG
1220  *  \param  sig  pointer to ECDSA_SIG structure
1221  *  \param  pr   pointer to BIGNUM pointer for r (may be NULL)
1222  *  \param  ps   pointer to BIGNUM pointer for s (may be NULL)
1223  */
1224 void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps);
1225
1226 /** Accessor for r field of ECDSA_SIG
1227  *  \param  sig  pointer to ECDSA_SIG structure
1228  */
1229 const BIGNUM *ECDSA_SIG_get0_r(const ECDSA_SIG *sig);
1230
1231 /** Accessor for s field of ECDSA_SIG
1232  *  \param  sig  pointer to ECDSA_SIG structure
1233  */
1234 const BIGNUM *ECDSA_SIG_get0_s(const ECDSA_SIG *sig);
1235
1236 /** Setter for r and s fields of ECDSA_SIG
1237  *  \param  sig  pointer to ECDSA_SIG structure
1238  *  \param  r    pointer to BIGNUM for r (may be NULL)
1239  *  \param  s    pointer to BIGNUM for s (may be NULL)
1240  */
1241 int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s);
1242
1243 /** Computes the ECDSA signature of the given hash value using
1244  *  the supplied private key and returns the created signature.
1245  *  \param  dgst      pointer to the hash value
1246  *  \param  dgst_len  length of the hash value
1247  *  \param  eckey     EC_KEY object containing a private EC key
1248  *  \return pointer to a ECDSA_SIG structure or NULL if an error occurred
1249  */
1250 DEPRECATEDIN_3_0(ECDSA_SIG *ECDSA_do_sign(const unsigned char *dgst,
1251                                           int dgst_len, EC_KEY *eckey))
1252
1253 /** Computes ECDSA signature of a given hash value using the supplied
1254  *  private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
1255  *  \param  dgst     pointer to the hash value to sign
1256  *  \param  dgstlen  length of the hash value
1257  *  \param  kinv     BIGNUM with a pre-computed inverse k (optional)
1258  *  \param  rp       BIGNUM with a pre-computed rp value (optional),
1259  *                   see ECDSA_sign_setup
1260  *  \param  eckey    EC_KEY object containing a private EC key
1261  *  \return pointer to a ECDSA_SIG structure or NULL if an error occurred
1262  */
1263 DEPRECATEDIN_3_0(ECDSA_SIG *ECDSA_do_sign_ex(const unsigned char *dgst,
1264                                              int dgstlen, const BIGNUM *kinv,
1265                                              const BIGNUM *rp, EC_KEY *eckey))
1266
1267 /** Verifies that the supplied signature is a valid ECDSA
1268  *  signature of the supplied hash value using the supplied public key.
1269  *  \param  dgst      pointer to the hash value
1270  *  \param  dgst_len  length of the hash value
1271  *  \param  sig       ECDSA_SIG structure
1272  *  \param  eckey     EC_KEY object containing a public EC key
1273  *  \return 1 if the signature is valid, 0 if the signature is invalid
1274  *          and -1 on error
1275  */
1276 DEPRECATEDIN_3_0(int ECDSA_do_verify(const unsigned char *dgst, int dgst_len,
1277                                      const ECDSA_SIG *sig, EC_KEY *eckey))
1278
1279 /** Precompute parts of the signing operation
1280  *  \param  eckey  EC_KEY object containing a private EC key
1281  *  \param  ctx    BN_CTX object (optional)
1282  *  \param  kinv   BIGNUM pointer for the inverse of k
1283  *  \param  rp     BIGNUM pointer for x coordinate of k * generator
1284  *  \return 1 on success and 0 otherwise
1285  */
1286 DEPRECATEDIN_3_0(int ECDSA_sign_setup(EC_KEY *eckey, BN_CTX *ctx,
1287                                       BIGNUM **kinv, BIGNUM **rp))
1288
1289 /** Computes ECDSA signature of a given hash value using the supplied
1290  *  private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
1291  *  \param  type     this parameter is ignored
1292  *  \param  dgst     pointer to the hash value to sign
1293  *  \param  dgstlen  length of the hash value
1294  *  \param  sig      memory for the DER encoded created signature
1295  *  \param  siglen   pointer to the length of the returned signature
1296  *  \param  eckey    EC_KEY object containing a private EC key
1297  *  \return 1 on success and 0 otherwise
1298  */
1299 DEPRECATEDIN_3_0(int ECDSA_sign(int type, const unsigned char *dgst,
1300                                 int dgstlen, unsigned char *sig,
1301                                 unsigned int *siglen, EC_KEY *eckey))
1302
1303 /** Computes ECDSA signature of a given hash value using the supplied
1304  *  private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
1305  *  \param  type     this parameter is ignored
1306  *  \param  dgst     pointer to the hash value to sign
1307  *  \param  dgstlen  length of the hash value
1308  *  \param  sig      buffer to hold the DER encoded signature
1309  *  \param  siglen   pointer to the length of the returned signature
1310  *  \param  kinv     BIGNUM with a pre-computed inverse k (optional)
1311  *  \param  rp       BIGNUM with a pre-computed rp value (optional),
1312  *                   see ECDSA_sign_setup
1313  *  \param  eckey    EC_KEY object containing a private EC key
1314  *  \return 1 on success and 0 otherwise
1315  */
1316 DEPRECATEDIN_3_0(int ECDSA_sign_ex(int type, const unsigned char *dgst,
1317                                    int dgstlen, unsigned char *sig,
1318                                    unsigned int *siglen, const BIGNUM *kinv,
1319                                    const BIGNUM *rp, EC_KEY *eckey))
1320
1321 /** Verifies that the given signature is valid ECDSA signature
1322  *  of the supplied hash value using the specified public key.
1323  *  \param  type     this parameter is ignored
1324  *  \param  dgst     pointer to the hash value
1325  *  \param  dgstlen  length of the hash value
1326  *  \param  sig      pointer to the DER encoded signature
1327  *  \param  siglen   length of the DER encoded signature
1328  *  \param  eckey    EC_KEY object containing a public EC key
1329  *  \return 1 if the signature is valid, 0 if the signature is invalid
1330  *          and -1 on error
1331  */
1332 DEPRECATEDIN_3_0(int ECDSA_verify(int type, const unsigned char *dgst,
1333                                   int dgstlen, const unsigned char *sig,
1334                                   int siglen, EC_KEY *eckey))
1335
1336 /** Returns the maximum length of the DER encoded signature
1337  *  \param  eckey  EC_KEY object
1338  *  \return numbers of bytes required for the DER encoded signature
1339  */
1340 DEPRECATEDIN_3_0(int ECDSA_size(const EC_KEY *eckey))
1341
1342 /********************************************************************/
1343 /*  EC_KEY_METHOD constructors, destructors, writers and accessors  */
1344 /********************************************************************/
1345
1346 DEPRECATEDIN_3_0(EC_KEY_METHOD *EC_KEY_METHOD_new(const EC_KEY_METHOD *meth))
1347 DEPRECATEDIN_3_0(void EC_KEY_METHOD_free(EC_KEY_METHOD *meth))
1348 DEPRECATEDIN_3_0(void EC_KEY_METHOD_set_init
1349                  (EC_KEY_METHOD *meth,
1350                   int (*init)(EC_KEY *key),
1351                   void (*finish)(EC_KEY *key),
1352                   int (*copy)(EC_KEY *dest, const EC_KEY *src),
1353                   int (*set_group)(EC_KEY *key, const EC_GROUP *grp),
1354                   int (*set_private)(EC_KEY *key,
1355                                      const BIGNUM *priv_key),
1356                   int (*set_public)(EC_KEY *key,
1357                                     const EC_POINT *pub_key)))
1358
1359 DEPRECATEDIN_3_0(void EC_KEY_METHOD_set_keygen(EC_KEY_METHOD *meth,
1360                                                int (*keygen)(EC_KEY *key)))
1361
1362 DEPRECATEDIN_3_0(void EC_KEY_METHOD_set_compute_key
1363                  (EC_KEY_METHOD *meth,
1364                   int (*ckey)(unsigned char **psec,
1365                               size_t *pseclen,
1366                               const EC_POINT *pub_key,
1367                               const EC_KEY *ecdh)))
1368
1369 DEPRECATEDIN_3_0(void EC_KEY_METHOD_set_sign
1370                  (EC_KEY_METHOD *meth,
1371                   int (*sign)(int type, const unsigned char *dgst,
1372                               int dlen, unsigned char *sig,
1373                               unsigned int *siglen,
1374                               const BIGNUM *kinv, const BIGNUM *r,
1375                               EC_KEY *eckey),
1376                   int (*sign_setup)(EC_KEY *eckey, BN_CTX *ctx_in,
1377                                     BIGNUM **kinvp, BIGNUM **rp),
1378                   ECDSA_SIG *(*sign_sig)(const unsigned char *dgst,
1379                                          int dgst_len,
1380                                          const BIGNUM *in_kinv,
1381                                          const BIGNUM *in_r,
1382                                          EC_KEY *eckey)))
1383
1384 DEPRECATEDIN_3_0(void EC_KEY_METHOD_set_verify
1385                  (EC_KEY_METHOD *meth,
1386                   int (*verify)(int type, const unsigned
1387                                 char *dgst, int dgst_len,
1388                                 const unsigned char *sigbuf,
1389                                 int sig_len, EC_KEY *eckey),
1390                   int (*verify_sig)(const unsigned char *dgst,
1391                                     int dgst_len,
1392                                     const ECDSA_SIG *sig,
1393                                     EC_KEY *eckey)))
1394
1395 DEPRECATEDIN_3_0(void EC_KEY_METHOD_get_init
1396                  (const EC_KEY_METHOD *meth,
1397                   int (**pinit)(EC_KEY *key),
1398                   void (**pfinish)(EC_KEY *key),
1399                   int (**pcopy)(EC_KEY *dest, const EC_KEY *src),
1400                   int (**pset_group)(EC_KEY *key,
1401                                      const EC_GROUP *grp),
1402                   int (**pset_private)(EC_KEY *key,
1403                                        const BIGNUM *priv_key),
1404                   int (**pset_public)(EC_KEY *key,
1405                                       const EC_POINT *pub_key)))
1406
1407 DEPRECATEDIN_3_0(void EC_KEY_METHOD_get_keygen(const EC_KEY_METHOD *meth,
1408                                                int (**pkeygen)(EC_KEY *key)))
1409
1410 DEPRECATEDIN_3_0(void EC_KEY_METHOD_get_compute_key
1411                  (const EC_KEY_METHOD *meth,
1412                   int (**pck)(unsigned char **psec,
1413                               size_t *pseclen,
1414                               const EC_POINT *pub_key,
1415                               const EC_KEY *ecdh)))
1416
1417 DEPRECATEDIN_3_0(void EC_KEY_METHOD_get_sign
1418                  (const EC_KEY_METHOD *meth,
1419                   int (**psign)(int type, const unsigned char *dgst,
1420                                 int dlen, unsigned char *sig,
1421                                 unsigned int *siglen,
1422                                 const BIGNUM *kinv, const BIGNUM *r,
1423                                 EC_KEY *eckey),
1424                   int (**psign_setup)(EC_KEY *eckey, BN_CTX *ctx_in,
1425                                       BIGNUM **kinvp, BIGNUM **rp),
1426                   ECDSA_SIG *(**psign_sig)(const unsigned char *dgst,
1427                                            int dgst_len,
1428                                            const BIGNUM *in_kinv,
1429                                            const BIGNUM *in_r,
1430                                            EC_KEY *eckey)))
1431
1432 DEPRECATEDIN_3_0(void EC_KEY_METHOD_get_verify
1433                  (const EC_KEY_METHOD *meth,
1434                   int (**pverify)(int type, const unsigned
1435                                   char *dgst, int dgst_len,
1436                                   const unsigned char *sigbuf,
1437                                   int sig_len, EC_KEY *eckey),
1438                   int (**pverify_sig)(const unsigned char *dgst,
1439                                       int dgst_len,
1440                                       const ECDSA_SIG *sig,
1441                                       EC_KEY *eckey)))
1442
1443 #  define ECParameters_dup(x) ASN1_dup_of(EC_KEY, i2d_ECParameters, \
1444                                            d2i_ECParameters, x)
1445
1446 #  ifndef __cplusplus
1447 #   if defined(__SUNPRO_C)
1448 #    if __SUNPRO_C >= 0x520
1449 #     pragma error_messages (default,E_ARRAY_OF_INCOMPLETE_NONAME,E_ARRAY_OF_INCOMPLETE)
1450 #    endif
1451 #   endif
1452 #  endif
1453
1454 int EVP_PKEY_CTX_set_ec_paramgen_curve_name(EVP_PKEY_CTX *ctx,
1455                                             const char *name);
1456 int EVP_PKEY_CTX_get_ec_paramgen_curve_name(EVP_PKEY_CTX *ctx,
1457                                             char *name, size_t namelen);
1458 int EVP_PKEY_CTX_set_ec_paramgen_curve_nid(EVP_PKEY_CTX *ctx, int nid);
1459
1460 #  define EVP_PKEY_CTX_set_ec_param_enc(ctx, flag) \
1461         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
1462                           EVP_PKEY_OP_PARAMGEN|EVP_PKEY_OP_KEYGEN, \
1463                           EVP_PKEY_CTRL_EC_PARAM_ENC, flag, NULL)
1464
1465 int EVP_PKEY_CTX_set_ecdh_cofactor_mode(EVP_PKEY_CTX *ctx, int cofactor_mode);
1466 int EVP_PKEY_CTX_get_ecdh_cofactor_mode(EVP_PKEY_CTX *ctx);
1467
1468 int EVP_PKEY_CTX_set_ecdh_kdf_type(EVP_PKEY_CTX *ctx, int kdf);
1469 int EVP_PKEY_CTX_get_ecdh_kdf_type(EVP_PKEY_CTX *ctx);
1470
1471 int EVP_PKEY_CTX_set_ecdh_kdf_md(EVP_PKEY_CTX *ctx, const EVP_MD *md);
1472 int EVP_PKEY_CTX_get_ecdh_kdf_md(EVP_PKEY_CTX *ctx, const EVP_MD **md);
1473
1474 int EVP_PKEY_CTX_set_ecdh_kdf_outlen(EVP_PKEY_CTX *ctx, int len);
1475 int EVP_PKEY_CTX_get_ecdh_kdf_outlen(EVP_PKEY_CTX *ctx, int *len);
1476
1477 int EVP_PKEY_CTX_set0_ecdh_kdf_ukm(EVP_PKEY_CTX *ctx, unsigned char *ukm,
1478                                    int len);
1479 int EVP_PKEY_CTX_get0_ecdh_kdf_ukm(EVP_PKEY_CTX *ctx, unsigned char **ukm);
1480
1481 /* SM2 will skip the operation check so no need to pass operation here */
1482 #  define EVP_PKEY_CTX_set1_id(ctx, id, id_len) \
1483         EVP_PKEY_CTX_ctrl(ctx, -1, -1, \
1484                           EVP_PKEY_CTRL_SET1_ID, (int)id_len, (void*)(id))
1485 #  define EVP_PKEY_CTX_get1_id(ctx, id) \
1486         EVP_PKEY_CTX_ctrl(ctx, -1, -1, \
1487                           EVP_PKEY_CTRL_GET1_ID, 0, (void*)(id))
1488
1489 #  define EVP_PKEY_CTX_get1_id_len(ctx, id_len) \
1490         EVP_PKEY_CTX_ctrl(ctx, -1, -1, \
1491                           EVP_PKEY_CTRL_GET1_ID_LEN, 0, (void*)(id_len))
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 #  define EVP_PKEY_CTRL_SET1_ID                       (EVP_PKEY_ALG_CTRL + 11)
1504 #  define EVP_PKEY_CTRL_GET1_ID                       (EVP_PKEY_ALG_CTRL + 12)
1505 #  define EVP_PKEY_CTRL_GET1_ID_LEN                   (EVP_PKEY_ALG_CTRL + 13)
1506
1507 /* KDF types */
1508 #  define EVP_PKEY_ECDH_KDF_NONE                      1
1509 #  define EVP_PKEY_ECDH_KDF_X9_63                     2
1510 /** The old name for EVP_PKEY_ECDH_KDF_X9_63
1511  *  The ECDH KDF specification has been mistakingly attributed to ANSI X9.62,
1512  *  it is actually specified in ANSI X9.63.
1513  *  This identifier is retained for backwards compatibility
1514  */
1515 #  define EVP_PKEY_ECDH_KDF_X9_62   EVP_PKEY_ECDH_KDF_X9_63
1516
1517 #  ifdef  __cplusplus
1518 }
1519 #  endif
1520 # endif
1521 #endif