include/openssl/ec.h

   1 /*
   2  * Copyright 2002-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
   4  *
   5  * Licensed under the OpenSSL license (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 HEADER_EC_H
  12 # define HEADER_EC_H
  13
  14 # include <openssl/opensslconf.h>
  15
  16 # ifndef OPENSSL_NO_EC
  17 # include <openssl/asn1.h>
  18 # include <openssl/symhacks.h>
  19 # if OPENSSL_API_COMPAT < 0x10100000L
  20 #  include <openssl/bn.h>
  21 # endif
  22 # include <openssl/ecerr.h>
  23 # ifdef  __cplusplus
  24 extern "C" {
  25 # endif
  26
  27 # ifndef OPENSSL_ECC_MAX_FIELD_BITS
  28 #  define OPENSSL_ECC_MAX_FIELD_BITS 661
  29 # endif
  30
  31 /** Enum for the point conversion form as defined in X9.62 (ECDSA)
  32  *  for the encoding of a elliptic curve point (x,y) */
  33 typedef enum {
  34         /** the point is encoded as z||x, where the octet z specifies
  35          *  which solution of the quadratic equation y is  */
  36     POINT_CONVERSION_COMPRESSED = 2,
  37         /** the point is encoded as z||x||y, where z is the octet 0x04  */
  38     POINT_CONVERSION_UNCOMPRESSED = 4,
  39         /** the point is encoded as z||x||y, where the octet z specifies
  40          *  which solution of the quadratic equation y is  */
  41     POINT_CONVERSION_HYBRID = 6
  42 } point_conversion_form_t;
  43
  44 typedef struct ec_method_st EC_METHOD;
  45 typedef struct ec_group_st EC_GROUP;
  46 typedef struct ec_point_st EC_POINT;
  47 typedef struct ecpk_parameters_st ECPKPARAMETERS;
  48 typedef struct ec_parameters_st ECPARAMETERS;
  49
  50 /********************************************************************/
  51 /*               EC_METHODs for curves over GF(p)                   */
  52 /********************************************************************/
  53
  54 /** Returns the basic GFp ec methods which provides the basis for the
  55  *  optimized methods.
  56  *  \return  EC_METHOD object
  57  */
  58 const EC_METHOD *EC_GFp_simple_method(void);
  59
  60 /** Returns GFp methods using montgomery multiplication.
  61  *  \return  EC_METHOD object
  62  */
  63 const EC_METHOD *EC_GFp_mont_method(void);
  64
  65 /** Returns GFp methods using optimized methods for NIST recommended curves
  66  *  \return  EC_METHOD object
  67  */
  68 const EC_METHOD *EC_GFp_nist_method(void);
  69
  70 # ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
  71 /** Returns 64-bit optimized methods for nistp224
  72  *  \return  EC_METHOD object
  73  */
  74 const EC_METHOD *EC_GFp_nistp224_method(void);
  75
  76 /** Returns 64-bit optimized methods for nistp256
  77  *  \return  EC_METHOD object
  78  */
  79 const EC_METHOD *EC_GFp_nistp256_method(void);
  80
  81 /** Returns 64-bit optimized methods for nistp521
  82  *  \return  EC_METHOD object
  83  */
  84 const EC_METHOD *EC_GFp_nistp521_method(void);
  85 # endif
  86
  87 # ifndef OPENSSL_NO_EC2M
  88 /********************************************************************/
  89 /*           EC_METHOD for curves over GF(2^m)                      */
  90 /********************************************************************/
  91
  92 /** Returns the basic GF2m ec method
  93  *  \return  EC_METHOD object
  94  */
  95 const EC_METHOD *EC_GF2m_simple_method(void);
  96
  97 # endif
  98
  99 /********************************************************************/
 100 /*                   EC_GROUP functions                             */
 101 /********************************************************************/
 102
 103 /** Creates a new EC_GROUP object
 104  *  \param   meth  EC_METHOD to use
 105  *  \return  newly created EC_GROUP object or NULL in case of an error.
 106  */
 107 EC_GROUP *EC_GROUP_new(const EC_METHOD *meth);
 108
 109 /** Frees a EC_GROUP object
 110  *  \param  group  EC_GROUP object to be freed.
 111  */
 112 void EC_GROUP_free(EC_GROUP *group);
 113
 114 /** Clears and frees a EC_GROUP object
 115  *  \param  group  EC_GROUP object to be cleared and freed.
 116  */
 117 void EC_GROUP_clear_free(EC_GROUP *group);
 118
 119 /** Copies EC_GROUP objects. Note: both EC_GROUPs must use the same EC_METHOD.
 120  *  \param  dst  destination EC_GROUP object
 121  *  \param  src  source EC_GROUP object
 122  *  \return 1 on success and 0 if an error occurred.
 123  */
 124 int EC_GROUP_copy(EC_GROUP *dst, const EC_GROUP *src);
 125
 126 /** Creates a new EC_GROUP object and copies the copies the content
 127  *  form src to the newly created EC_KEY object
 128  *  \param  src  source EC_GROUP object
 129  *  \return newly created EC_GROUP object or NULL in case of an error.
 130  */
 131 EC_GROUP *EC_GROUP_dup(const EC_GROUP *src);
 132
 133 /** Returns the EC_METHOD of the EC_GROUP object.
 134  *  \param  group  EC_GROUP object
 135  *  \return EC_METHOD used in this EC_GROUP object.
 136  */
 137 const EC_METHOD *EC_GROUP_method_of(const EC_GROUP *group);
 138
 139 /** Returns the field type of the EC_METHOD.
 140  *  \param  meth  EC_METHOD object
 141  *  \return NID of the underlying field type OID.
 142  */
 143 int EC_METHOD_get_field_type(const EC_METHOD *meth);
 144
 145 /** Sets the generator and it's order/cofactor of a EC_GROUP object.
 146  *  \param  group      EC_GROUP object
 147  *  \param  generator  EC_POINT object with the generator.
 148  *  \param  order      the order of the group generated by the generator.
 149  *  \param  cofactor   the index of the sub-group generated by the generator
 150  *                     in the group of all points on the elliptic curve.
 151  *  \return 1 on success and 0 if an error occurred
 152  */
 153 int EC_GROUP_set_generator(EC_GROUP *group, const EC_POINT *generator,
 154                            const BIGNUM *order, const BIGNUM *cofactor);
 155
 156 /** Returns the generator of a EC_GROUP object.
 157  *  \param  group  EC_GROUP object
 158  *  \return the currently used generator (possibly NULL).
 159  */
 160 const EC_POINT *EC_GROUP_get0_generator(const EC_GROUP *group);
 161
 162 /** Returns the montgomery data for order(Generator)
 163  *  \param  group  EC_GROUP object
 164  *  \return the currently used montgomery data (possibly NULL).
 165 */
 166 BN_MONT_CTX *EC_GROUP_get_mont_data(const EC_GROUP *group);
 167
 168 /** Gets the order of a EC_GROUP
 169  *  \param  group  EC_GROUP object
 170  *  \param  order  BIGNUM to which the order is copied
 171  *  \param  ctx    unused
 172  *  \return 1 on success and 0 if an error occurred
 173  */
 174 int EC_GROUP_get_order(const EC_GROUP *group, BIGNUM *order, BN_CTX *ctx);
 175
 176 /** Gets the order of an EC_GROUP
 177  *  \param  group  EC_GROUP object
 178  *  \return the group order
 179  */
 180 const BIGNUM *EC_GROUP_get0_order(const EC_GROUP *group);
 181
 182 /** Gets the number of bits of the order of an EC_GROUP
 183  *  \param  group  EC_GROUP object
 184  *  \return number of bits of group order.
 185  */
 186 int EC_GROUP_order_bits(const EC_GROUP *group);
 187
 188 /** Gets the cofactor of a EC_GROUP
 189  *  \param  group     EC_GROUP object
 190  *  \param  cofactor  BIGNUM to which the cofactor is copied
 191  *  \param  ctx       unused
 192  *  \return 1 on success and 0 if an error occurred
 193  */
 194 int EC_GROUP_get_cofactor(const EC_GROUP *group, BIGNUM *cofactor,
 195                           BN_CTX *ctx);
 196
 197 /** Gets the cofactor of an EC_GROUP
 198  *  \param  group  EC_GROUP object
 199  *  \return the group cofactor
 200  */
 201 const BIGNUM *EC_GROUP_get0_cofactor(const EC_GROUP *group);
 202
 203 /** Sets the name of a EC_GROUP object
 204  *  \param  group  EC_GROUP object
 205  *  \param  nid    NID of the curve name OID
 206  */
 207 void EC_GROUP_set_curve_name(EC_GROUP *group, int nid);
 208
 209 /** Returns the curve name of a EC_GROUP object
 210  *  \param  group  EC_GROUP object
 211  *  \return NID of the curve name OID or 0 if not set.
 212  */
 213 int EC_GROUP_get_curve_name(const EC_GROUP *group);
 214
 215 void EC_GROUP_set_asn1_flag(EC_GROUP *group, int flag);
 216 int EC_GROUP_get_asn1_flag(const EC_GROUP *group);
 217
 218 void EC_GROUP_set_point_conversion_form(EC_GROUP *group,
 219                                         point_conversion_form_t form);
 220 point_conversion_form_t EC_GROUP_get_point_conversion_form(const EC_GROUP *);
 221
 222 unsigned char *EC_GROUP_get0_seed(const EC_GROUP *x);
 223 size_t EC_GROUP_get_seed_len(const EC_GROUP *);
 224 size_t EC_GROUP_set_seed(EC_GROUP *, const unsigned char *, size_t len);
 225
 226 /** Sets the parameter of a ec over GFp defined by y^2 = x^3 + a*x + b
 227  *  \param  group  EC_GROUP object
 228  *  \param  p      BIGNUM with the prime number
 229  *  \param  a      BIGNUM with parameter a of the equation
 230  *  \param  b      BIGNUM with parameter b of the equation
 231  *  \param  ctx    BN_CTX object (optional)
 232  *  \return 1 on success and 0 if an error occurred
 233  */
 234 int EC_GROUP_set_curve_GFp(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a,
 235                            const BIGNUM *b, BN_CTX *ctx);
 236
 237 /** Gets the parameter of the ec over GFp defined by y^2 = x^3 + a*x + b
 238  *  \param  group  EC_GROUP object
 239  *  \param  p      BIGNUM for the prime number
 240  *  \param  a      BIGNUM for parameter a of the equation
 241  *  \param  b      BIGNUM for parameter b of the equation
 242  *  \param  ctx    BN_CTX object (optional)
 243  *  \return 1 on success and 0 if an error occurred
 244  */
 245 int EC_GROUP_get_curve_GFp(const EC_GROUP *group, BIGNUM *p, BIGNUM *a,
 246                            BIGNUM *b, BN_CTX *ctx);
 247
 248 # ifndef OPENSSL_NO_EC2M
 249 /** Sets the parameter of a ec over GF2m defined by y^2 + x*y = x^3 + a*x^2 + b
 250  *  \param  group  EC_GROUP object
 251  *  \param  p      BIGNUM with the polynomial defining the underlying field
 252  *  \param  a      BIGNUM with parameter a of the equation
 253  *  \param  b      BIGNUM with parameter b of the equation
 254  *  \param  ctx    BN_CTX object (optional)
 255  *  \return 1 on success and 0 if an error occurred
 256  */
 257 int EC_GROUP_set_curve_GF2m(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a,
 258                             const BIGNUM *b, BN_CTX *ctx);
 259
 260 /** Gets the parameter of the ec over GF2m defined by y^2 + x*y = x^3 + a*x^2 + b
 261  *  \param  group  EC_GROUP object
 262  *  \param  p      BIGNUM for the polynomial defining the underlying field
 263  *  \param  a      BIGNUM for parameter a of the equation
 264  *  \param  b      BIGNUM for parameter b of the equation
 265  *  \param  ctx    BN_CTX object (optional)
 266  *  \return 1 on success and 0 if an error occurred
 267  */
 268 int EC_GROUP_get_curve_GF2m(const EC_GROUP *group, BIGNUM *p, BIGNUM *a,
 269                             BIGNUM *b, BN_CTX *ctx);
 270 # endif
 271 /** Returns the number of bits needed to represent a field element
 272  *  \param  group  EC_GROUP object
 273  *  \return number of bits needed to represent a field element
 274  */
 275 int EC_GROUP_get_degree(const EC_GROUP *group);
 276
 277 /** Checks whether the parameter in the EC_GROUP define a valid ec group
 278  *  \param  group  EC_GROUP object
 279  *  \param  ctx    BN_CTX object (optional)
 280  *  \return 1 if group is a valid ec group and 0 otherwise
 281  */
 282 int EC_GROUP_check(const EC_GROUP *group, BN_CTX *ctx);
 283
 284 /** Checks whether the discriminant of the elliptic curve is zero or not
 285  *  \param  group  EC_GROUP object
 286  *  \param  ctx    BN_CTX object (optional)
 287  *  \return 1 if the discriminant is not zero and 0 otherwise
 288  */
 289 int EC_GROUP_check_discriminant(const EC_GROUP *group, BN_CTX *ctx);
 290
 291 /** Compares two EC_GROUP objects
 292  *  \param  a    first EC_GROUP object
 293  *  \param  b    second EC_GROUP object
 294  *  \param  ctx  BN_CTX object (optional)
 295  *  \return 0 if the groups are equal, 1 if not, or -1 on error
 296  */
 297 int EC_GROUP_cmp(const EC_GROUP *a, const EC_GROUP *b, BN_CTX *ctx);
 298
 299 /*
 300  * EC_GROUP_new_GF*() calls EC_GROUP_new() and EC_GROUP_set_GF*() after
 301  * choosing an appropriate EC_METHOD
 302  */
 303
 304 /** Creates a new EC_GROUP object with the specified parameters defined
 305  *  over GFp (defined by the equation y^2 = x^3 + a*x + b)
 306  *  \param  p    BIGNUM with the prime number
 307  *  \param  a    BIGNUM with the parameter a of the equation
 308  *  \param  b    BIGNUM with the parameter b of the equation
 309  *  \param  ctx  BN_CTX object (optional)
 310  *  \return newly created EC_GROUP object with the specified parameters
 311  */
 312 EC_GROUP *EC_GROUP_new_curve_GFp(const BIGNUM *p, const BIGNUM *a,
 313                                  const BIGNUM *b, BN_CTX *ctx);
 314 # ifndef OPENSSL_NO_EC2M
 315 /** Creates a new EC_GROUP object with the specified parameters defined
 316  *  over GF2m (defined by the equation y^2 + x*y = x^3 + a*x^2 + b)
 317  *  \param  p    BIGNUM with the polynomial defining the underlying field
 318  *  \param  a    BIGNUM with the parameter a of the equation
 319  *  \param  b    BIGNUM with the parameter b of the equation
 320  *  \param  ctx  BN_CTX object (optional)
 321  *  \return newly created EC_GROUP object with the specified parameters
 322  */
 323 EC_GROUP *EC_GROUP_new_curve_GF2m(const BIGNUM *p, const BIGNUM *a,
 324                                   const BIGNUM *b, BN_CTX *ctx);
 325 # endif
 326
 327 /** Creates a EC_GROUP object with a curve specified by a NID
 328  *  \param  nid  NID of the OID of the curve name
 329  *  \return newly created EC_GROUP object with specified curve or NULL
 330  *          if an error occurred
 331  */
 332 EC_GROUP *EC_GROUP_new_by_curve_name(int nid);
 333
 334 /** Creates a new EC_GROUP object from an ECPARAMETERS object
 335  *  \param  params  pointer to the ECPARAMETERS object
 336  *  \return newly created EC_GROUP object with specified curve or NULL
 337  *          if an error occurred
 338  */
 339 EC_GROUP *EC_GROUP_new_from_ecparameters(const ECPARAMETERS *params);
 340
 341 /** Creates an ECPARAMETERS object for the the given EC_GROUP object.
 342  *  \param  group   pointer to the EC_GROUP object
 343  *  \param  params  pointer to an existing ECPARAMETERS object or NULL
 344  *  \return pointer to the new ECPARAMETERS object or NULL
 345  *          if an error occurred.
 346  */
 347 ECPARAMETERS *EC_GROUP_get_ecparameters(const EC_GROUP *group,
 348                                         ECPARAMETERS *params);
 349
 350 /** Creates a new EC_GROUP object from an ECPKPARAMETERS object
 351  *  \param  params  pointer to an existing ECPKPARAMETERS object, or NULL
 352  *  \return newly created EC_GROUP object with specified curve, or NULL
 353  *          if an error occurred
 354  */
 355 EC_GROUP *EC_GROUP_new_from_ecpkparameters(const ECPKPARAMETERS *params);
 356
 357 /** Creates an ECPKPARAMETERS object for the the given EC_GROUP object.
 358  *  \param  group   pointer to the EC_GROUP object
 359  *  \param  params  pointer to an existing ECPKPARAMETERS object or NULL
 360  *  \return pointer to the new ECPKPARAMETERS object or NULL
 361  *          if an error occurred.
 362  */
 363 ECPKPARAMETERS *EC_GROUP_get_ecpkparameters(const EC_GROUP *group,
 364                                             ECPKPARAMETERS *params);
 365
 366 /********************************************************************/
 367 /*               handling of internal curves                        */
 368 /********************************************************************/
 369
 370 typedef struct {
 371     int nid;
 372     const char *comment;
 373 } EC_builtin_curve;
 374
 375 /*
 376  * EC_builtin_curves(EC_builtin_curve *r, size_t size) returns number of all
 377  * available curves or zero if a error occurred. In case r is not zero,
 378  * nitems EC_builtin_curve structures are filled with the data of the first
 379  * nitems internal groups
 380  */
 381 size_t EC_get_builtin_curves(EC_builtin_curve *r, size_t nitems);
 382
 383 const char *EC_curve_nid2nist(int nid);
 384 int EC_curve_nist2nid(const char *name);
 385
 386 /********************************************************************/
 387 /*                    EC_POINT functions                            */
 388 /********************************************************************/
 389
 390 /** Creates a new EC_POINT object for the specified EC_GROUP
 391  *  \param  group  EC_GROUP the underlying EC_GROUP object
 392  *  \return newly created EC_POINT object or NULL if an error occurred
 393  */
 394 EC_POINT *EC_POINT_new(const EC_GROUP *group);
 395
 396 /** Frees a EC_POINT object
 397  *  \param  point  EC_POINT object to be freed
 398  */
 399 void EC_POINT_free(EC_POINT *point);
 400
 401 /** Clears and frees a EC_POINT object
 402  *  \param  point  EC_POINT object to be cleared and freed
 403  */
 404 void EC_POINT_clear_free(EC_POINT *point);
 405
 406 /** Copies EC_POINT object
 407  *  \param  dst  destination EC_POINT object
 408  *  \param  src  source EC_POINT object
 409  *  \return 1 on success and 0 if an error occurred
 410  */
 411 int EC_POINT_copy(EC_POINT *dst, const EC_POINT *src);
 412
 413 /** Creates a new EC_POINT object and copies the content of the supplied
 414  *  EC_POINT
 415  *  \param  src    source EC_POINT object
 416  *  \param  group  underlying the EC_GROUP object
 417  *  \return newly created EC_POINT object or NULL if an error occurred
 418  */
 419 EC_POINT *EC_POINT_dup(const EC_POINT *src, const EC_GROUP *group);
 420
 421 /** Returns the EC_METHOD used in EC_POINT object
 422  *  \param  point  EC_POINT object
 423  *  \return the EC_METHOD used
 424  */
 425 const EC_METHOD *EC_POINT_method_of(const EC_POINT *point);
 426
 427 /** Sets a point to infinity (neutral element)
 428  *  \param  group  underlying EC_GROUP object
 429  *  \param  point  EC_POINT to set to infinity
 430  *  \return 1 on success and 0 if an error occurred
 431  */
 432 int EC_POINT_set_to_infinity(const EC_GROUP *group, EC_POINT *point);
 433
 434 /** Sets the jacobian projective coordinates of a EC_POINT over GFp
 435  *  \param  group  underlying EC_GROUP object
 436  *  \param  p      EC_POINT object
 437  *  \param  x      BIGNUM with the x-coordinate
 438  *  \param  y      BIGNUM with the y-coordinate
 439  *  \param  z      BIGNUM with the z-coordinate
 440  *  \param  ctx    BN_CTX object (optional)
 441  *  \return 1 on success and 0 if an error occurred
 442  */
 443 int EC_POINT_set_Jprojective_coordinates_GFp(const EC_GROUP *group,
 444                                              EC_POINT *p, const BIGNUM *x,
 445                                              const BIGNUM *y, const BIGNUM *z,
 446                                              BN_CTX *ctx);
 447
 448 /** Gets the jacobian projective coordinates of a EC_POINT over GFp
 449  *  \param  group  underlying EC_GROUP object
 450  *  \param  p      EC_POINT object
 451  *  \param  x      BIGNUM for the x-coordinate
 452  *  \param  y      BIGNUM for the y-coordinate
 453  *  \param  z      BIGNUM for the z-coordinate
 454  *  \param  ctx    BN_CTX object (optional)
 455  *  \return 1 on success and 0 if an error occurred
 456  */
 457 int EC_POINT_get_Jprojective_coordinates_GFp(const EC_GROUP *group,
 458                                              const EC_POINT *p, BIGNUM *x,
 459                                              BIGNUM *y, BIGNUM *z,
 460                                              BN_CTX *ctx);
 461
 462 /** Sets the affine coordinates of a EC_POINT over GFp
 463  *  \param  group  underlying EC_GROUP object
 464  *  \param  p      EC_POINT object
 465  *  \param  x      BIGNUM with the x-coordinate
 466  *  \param  y      BIGNUM with the y-coordinate
 467  *  \param  ctx    BN_CTX object (optional)
 468  *  \return 1 on success and 0 if an error occurred
 469  */
 470 int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group, EC_POINT *p,
 471                                         const BIGNUM *x, const BIGNUM *y,
 472                                         BN_CTX *ctx);
 473
 474 /** Gets the affine coordinates of a EC_POINT over GFp
 475  *  \param  group  underlying EC_GROUP object
 476  *  \param  p      EC_POINT object
 477  *  \param  x      BIGNUM for the x-coordinate
 478  *  \param  y      BIGNUM for the y-coordinate
 479  *  \param  ctx    BN_CTX object (optional)
 480  *  \return 1 on success and 0 if an error occurred
 481  */
 482 int EC_POINT_get_affine_coordinates_GFp(const EC_GROUP *group,
 483                                         const EC_POINT *p, BIGNUM *x,
 484                                         BIGNUM *y, BN_CTX *ctx);
 485
 486 /** Sets the x9.62 compressed coordinates of a EC_POINT over GFp
 487  *  \param  group  underlying EC_GROUP object
 488  *  \param  p      EC_POINT object
 489  *  \param  x      BIGNUM with x-coordinate
 490  *  \param  y_bit  integer with the y-Bit (either 0 or 1)
 491  *  \param  ctx    BN_CTX object (optional)
 492  *  \return 1 on success and 0 if an error occurred
 493  */
 494 int EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP *group,
 495                                             EC_POINT *p, const BIGNUM *x,
 496                                             int y_bit, BN_CTX *ctx);
 497 # ifndef OPENSSL_NO_EC2M
 498 /** Sets the affine coordinates of a EC_POINT over GF2m
 499  *  \param  group  underlying EC_GROUP object
 500  *  \param  p      EC_POINT object
 501  *  \param  x      BIGNUM with the x-coordinate
 502  *  \param  y      BIGNUM with the y-coordinate
 503  *  \param  ctx    BN_CTX object (optional)
 504  *  \return 1 on success and 0 if an error occurred
 505  */
 506 int EC_POINT_set_affine_coordinates_GF2m(const EC_GROUP *group, EC_POINT *p,
 507                                          const BIGNUM *x, const BIGNUM *y,
 508                                          BN_CTX *ctx);
 509
 510 /** Gets the affine coordinates of a EC_POINT over GF2m
 511  *  \param  group  underlying EC_GROUP object
 512  *  \param  p      EC_POINT object
 513  *  \param  x      BIGNUM for the x-coordinate
 514  *  \param  y      BIGNUM for the y-coordinate
 515  *  \param  ctx    BN_CTX object (optional)
 516  *  \return 1 on success and 0 if an error occurred
 517  */
 518 int EC_POINT_get_affine_coordinates_GF2m(const EC_GROUP *group,
 519                                          const EC_POINT *p, BIGNUM *x,
 520                                          BIGNUM *y, BN_CTX *ctx);
 521
 522 /** Sets the x9.62 compressed coordinates of a EC_POINT over GF2m
 523  *  \param  group  underlying EC_GROUP object
 524  *  \param  p      EC_POINT object
 525  *  \param  x      BIGNUM with x-coordinate
 526  *  \param  y_bit  integer with the y-Bit (either 0 or 1)
 527  *  \param  ctx    BN_CTX object (optional)
 528  *  \return 1 on success and 0 if an error occurred
 529  */
 530 int EC_POINT_set_compressed_coordinates_GF2m(const EC_GROUP *group,
 531                                              EC_POINT *p, const BIGNUM *x,
 532                                              int y_bit, BN_CTX *ctx);
 533 # endif
 534 /** Encodes a EC_POINT object to a octet string
 535  *  \param  group  underlying EC_GROUP object
 536  *  \param  p      EC_POINT object
 537  *  \param  form   point conversion form
 538  *  \param  buf    memory buffer for the result. If NULL the function returns
 539  *                 required buffer size.
 540  *  \param  len    length of the memory buffer
 541  *  \param  ctx    BN_CTX object (optional)
 542  *  \return the length of the encoded octet string or 0 if an error occurred
 543  */
 544 size_t EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *p,
 545                           point_conversion_form_t form,
 546                           unsigned char *buf, size_t len, BN_CTX *ctx);
 547
 548 /** Decodes a EC_POINT from a octet string
 549  *  \param  group  underlying EC_GROUP object
 550  *  \param  p      EC_POINT object
 551  *  \param  buf    memory buffer with the encoded ec point
 552  *  \param  len    length of the encoded ec point
 553  *  \param  ctx    BN_CTX object (optional)
 554  *  \return 1 on success and 0 if an error occurred
 555  */
 556 int EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *p,
 557                        const unsigned char *buf, size_t len, BN_CTX *ctx);
 558
 559 /** Encodes an EC_POINT object to an allocated octet string
 560  *  \param  group  underlying EC_GROUP object
 561  *  \param  point  EC_POINT object
 562  *  \param  form   point conversion form
 563  *  \param  pbuf   returns pointer to allocated buffer
 564  *  \param  ctx    BN_CTX object (optional)
 565  *  \return the length of the encoded octet string or 0 if an error occurred
 566  */
 567 size_t EC_POINT_point2buf(const EC_GROUP *group, const EC_POINT *point,
 568                           point_conversion_form_t form,
 569                           unsigned char **pbuf, BN_CTX *ctx);
 570
 571 /* other interfaces to point2oct/oct2point: */
 572 BIGNUM *EC_POINT_point2bn(const EC_GROUP *, const EC_POINT *,
 573                           point_conversion_form_t form, BIGNUM *, BN_CTX *);
 574 EC_POINT *EC_POINT_bn2point(const EC_GROUP *, const BIGNUM *,
 575                             EC_POINT *, BN_CTX *);
 576 char *EC_POINT_point2hex(const EC_GROUP *, const EC_POINT *,
 577                          point_conversion_form_t form, BN_CTX *);
 578 EC_POINT *EC_POINT_hex2point(const EC_GROUP *, const char *,
 579                              EC_POINT *, BN_CTX *);
 580
 581 /********************************************************************/
 582 /*         functions for doing EC_POINT arithmetic                  */
 583 /********************************************************************/
 584
 585 /** Computes the sum of two EC_POINT
 586  *  \param  group  underlying EC_GROUP object
 587  *  \param  r      EC_POINT object for the result (r = a + b)
 588  *  \param  a      EC_POINT object with the first summand
 589  *  \param  b      EC_POINT object with the second summand
 590  *  \param  ctx    BN_CTX object (optional)
 591  *  \return 1 on success and 0 if an error occurred
 592  */
 593 int EC_POINT_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a,
 594                  const EC_POINT *b, BN_CTX *ctx);
 595
 596 /** Computes the double of a EC_POINT
 597  *  \param  group  underlying EC_GROUP object
 598  *  \param  r      EC_POINT object for the result (r = 2 * a)
 599  *  \param  a      EC_POINT object
 600  *  \param  ctx    BN_CTX object (optional)
 601  *  \return 1 on success and 0 if an error occurred
 602  */
 603 int EC_POINT_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a,
 604                  BN_CTX *ctx);
 605
 606 /** Computes the inverse of a EC_POINT
 607  *  \param  group  underlying EC_GROUP object
 608  *  \param  a      EC_POINT object to be inverted (it's used for the result as well)
 609  *  \param  ctx    BN_CTX object (optional)
 610  *  \return 1 on success and 0 if an error occurred
 611  */
 612 int EC_POINT_invert(const EC_GROUP *group, EC_POINT *a, BN_CTX *ctx);
 613
 614 /** Checks whether the point is the neutral element of the group
 615  *  \param  group  the underlying EC_GROUP object
 616  *  \param  p      EC_POINT object
 617  *  \return 1 if the point is the neutral element and 0 otherwise
 618  */
 619 int EC_POINT_is_at_infinity(const EC_GROUP *group, const EC_POINT *p);
 620
 621 /** Checks whether the point is on the curve
 622  *  \param  group  underlying EC_GROUP object
 623  *  \param  point  EC_POINT object to check
 624  *  \param  ctx    BN_CTX object (optional)
 625  *  \return 1 if the point is on the curve, 0 if not, or -1 on error
 626  */
 627 int EC_POINT_is_on_curve(const EC_GROUP *group, const EC_POINT *point,
 628                          BN_CTX *ctx);
 629
 630 /** Compares two EC_POINTs
 631  *  \param  group  underlying EC_GROUP object
 632  *  \param  a      first EC_POINT object
 633  *  \param  b      second EC_POINT object
 634  *  \param  ctx    BN_CTX object (optional)
 635  *  \return 1 if the points are not equal, 0 if they are, or -1 on error
 636  */
 637 int EC_POINT_cmp(const EC_GROUP *group, const EC_POINT *a, const EC_POINT *b,
 638                  BN_CTX *ctx);
 639
 640 int EC_POINT_make_affine(const EC_GROUP *group, EC_POINT *point, BN_CTX *ctx);
 641 int EC_POINTs_make_affine(const EC_GROUP *group, size_t num,
 642                           EC_POINT *points[], BN_CTX *ctx);
 643
 644 /** Computes r = generator * n + sum_{i=0}^{num-1} p[i] * m[i]
 645  *  \param  group  underlying EC_GROUP object
 646  *  \param  r      EC_POINT object for the result
 647  *  \param  n      BIGNUM with the multiplier for the group generator (optional)
 648  *  \param  num    number further summands
 649  *  \param  p      array of size num of EC_POINT objects
 650  *  \param  m      array of size num of BIGNUM objects
 651  *  \param  ctx    BN_CTX object (optional)
 652  *  \return 1 on success and 0 if an error occurred
 653  */
 654 int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *n,
 655                   size_t num, const EC_POINT *p[], const BIGNUM *m[],
 656                   BN_CTX *ctx);
 657
 658 /** Computes r = generator * n + q * m
 659  *  \param  group  underlying EC_GROUP object
 660  *  \param  r      EC_POINT object for the result
 661  *  \param  n      BIGNUM with the multiplier for the group generator (optional)
 662  *  \param  q      EC_POINT object with the first factor of the second summand
 663  *  \param  m      BIGNUM with the second factor of the second summand
 664  *  \param  ctx    BN_CTX object (optional)
 665  *  \return 1 on success and 0 if an error occurred
 666  */
 667 int EC_POINT_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *n,
 668                  const EC_POINT *q, const BIGNUM *m, BN_CTX *ctx);
 669
 670 /** Stores multiples of generator for faster point multiplication
 671  *  \param  group  EC_GROUP object
 672  *  \param  ctx    BN_CTX object (optional)
 673  *  \return 1 on success and 0 if an error occurred
 674  */
 675 int EC_GROUP_precompute_mult(EC_GROUP *group, BN_CTX *ctx);
 676
 677 /** Reports whether a precomputation has been done
 678  *  \param  group  EC_GROUP object
 679  *  \return 1 if a pre-computation has been done and 0 otherwise
 680  */
 681 int EC_GROUP_have_precompute_mult(const EC_GROUP *group);
 682
 683 /********************************************************************/
 684 /*                       ASN1 stuff                                 */
 685 /********************************************************************/
 686
 687 DECLARE_ASN1_ITEM(ECPKPARAMETERS)
 688 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPKPARAMETERS)
 689 DECLARE_ASN1_ITEM(ECPARAMETERS)
 690 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
 691
 692 /*
 693  * EC_GROUP_get_basis_type() returns the NID of the basis type used to
 694  * represent the field elements
 695  */
 696 int EC_GROUP_get_basis_type(const EC_GROUP *);
 697 # ifndef OPENSSL_NO_EC2M
 698 int EC_GROUP_get_trinomial_basis(const EC_GROUP *, unsigned int *k);
 699 int EC_GROUP_get_pentanomial_basis(const EC_GROUP *, unsigned int *k1,
 700                                    unsigned int *k2, unsigned int *k3);
 701 # endif
 702
 703 # define OPENSSL_EC_EXPLICIT_CURVE  0x000
 704 # define OPENSSL_EC_NAMED_CURVE     0x001
 705
 706 EC_GROUP *d2i_ECPKParameters(EC_GROUP **, const unsigned char **in, long len);
 707 int i2d_ECPKParameters(const EC_GROUP *, unsigned char **out);
 708
 709 # define d2i_ECPKParameters_bio(bp,x) ASN1_d2i_bio_of(EC_GROUP,NULL,d2i_ECPKParameters,bp,x)
 710 # define i2d_ECPKParameters_bio(bp,x) ASN1_i2d_bio_of_const(EC_GROUP,i2d_ECPKParameters,bp,x)
 711 # define d2i_ECPKParameters_fp(fp,x) (EC_GROUP *)ASN1_d2i_fp(NULL, \
 712                 (char *(*)())d2i_ECPKParameters,(fp),(unsigned char **)(x))
 713 # define i2d_ECPKParameters_fp(fp,x) ASN1_i2d_fp(i2d_ECPKParameters,(fp), \
 714                 (unsigned char *)(x))
 715
 716 int ECPKParameters_print(BIO *bp, const EC_GROUP *x, int off);
 717 # ifndef OPENSSL_NO_STDIO
 718 int ECPKParameters_print_fp(FILE *fp, const EC_GROUP *x, int off);
 719 # endif
 720
 721 /********************************************************************/
 722 /*                      EC_KEY functions                            */
 723 /********************************************************************/
 724
 725 /* some values for the encoding_flag */
 726 # define EC_PKEY_NO_PARAMETERS   0x001
 727 # define EC_PKEY_NO_PUBKEY       0x002
 728
 729 /* some values for the flags field */
 730 # define EC_FLAG_NON_FIPS_ALLOW  0x1
 731 # define EC_FLAG_FIPS_CHECKED    0x2
 732 # define EC_FLAG_COFACTOR_ECDH   0x1000
 733
 734 /** Creates a new EC_KEY object.
 735  *  \return EC_KEY object or NULL if an error occurred.
 736  */
 737 EC_KEY *EC_KEY_new(void);
 738
 739 int EC_KEY_get_flags(const EC_KEY *key);
 740
 741 void EC_KEY_set_flags(EC_KEY *key, int flags);
 742
 743 void EC_KEY_clear_flags(EC_KEY *key, int flags);
 744
 745 /** Creates a new EC_KEY object using a named curve as underlying
 746  *  EC_GROUP object.
 747  *  \param  nid  NID of the named curve.
 748  *  \return EC_KEY object or NULL if an error occurred.
 749  */
 750 EC_KEY *EC_KEY_new_by_curve_name(int nid);
 751
 752 /** Frees a EC_KEY object.
 753  *  \param  key  EC_KEY object to be freed.
 754  */
 755 void EC_KEY_free(EC_KEY *key);
 756
 757 /** Copies a EC_KEY object.
 758  *  \param  dst  destination EC_KEY object
 759  *  \param  src  src EC_KEY object
 760  *  \return dst or NULL if an error occurred.
 761  */
 762 EC_KEY *EC_KEY_copy(EC_KEY *dst, const EC_KEY *src);
 763
 764 /** Creates a new EC_KEY object and copies the content from src to it.
 765  *  \param  src  the source EC_KEY object
 766  *  \return newly created EC_KEY object or NULL if an error occurred.
 767  */
 768 EC_KEY *EC_KEY_dup(const EC_KEY *src);
 769
 770 /** Increases the internal reference count of a EC_KEY object.
 771  *  \param  key  EC_KEY object
 772  *  \return 1 on success and 0 if an error occurred.
 773  */
 774 int EC_KEY_up_ref(EC_KEY *key);
 775
 776 /** Returns the ENGINE object of a EC_KEY object
 777  *  \param  eckey  EC_KEY object
 778  *  \return the ENGINE object (possibly NULL).
 779  */
 780 ENGINE *EC_KEY_get0_engine(const EC_KEY *eckey);
 781
 782 /** Returns the EC_GROUP object of a EC_KEY object
 783  *  \param  key  EC_KEY object
 784  *  \return the EC_GROUP object (possibly NULL).
 785  */
 786 const EC_GROUP *EC_KEY_get0_group(const EC_KEY *key);
 787
 788 /** Sets the EC_GROUP of a EC_KEY object.
 789  *  \param  key    EC_KEY object
 790  *  \param  group  EC_GROUP to use in the EC_KEY object (note: the EC_KEY
 791  *                 object will use an own copy of the EC_GROUP).
 792  *  \return 1 on success and 0 if an error occurred.
 793  */
 794 int EC_KEY_set_group(EC_KEY *key, const EC_GROUP *group);
 795
 796 /** Returns the private key of a EC_KEY object.
 797  *  \param  key  EC_KEY object
 798  *  \return a BIGNUM with the private key (possibly NULL).
 799  */
 800 const BIGNUM *EC_KEY_get0_private_key(const EC_KEY *key);
 801
 802 /** Sets the private key of a EC_KEY object.
 803  *  \param  key  EC_KEY object
 804  *  \param  prv  BIGNUM with the private key (note: the EC_KEY object
 805  *               will use an own copy of the BIGNUM).
 806  *  \return 1 on success and 0 if an error occurred.
 807  */
 808 int EC_KEY_set_private_key(EC_KEY *key, const BIGNUM *prv);
 809
 810 /** Returns the public key of a EC_KEY object.
 811  *  \param  key  the EC_KEY object
 812  *  \return a EC_POINT object with the public key (possibly NULL)
 813  */
 814 const EC_POINT *EC_KEY_get0_public_key(const EC_KEY *key);
 815
 816 /** Sets the public key of a EC_KEY object.
 817  *  \param  key  EC_KEY object
 818  *  \param  pub  EC_POINT object with the public key (note: the EC_KEY object
 819  *               will use an own copy of the EC_POINT object).
 820  *  \return 1 on success and 0 if an error occurred.
 821  */
 822 int EC_KEY_set_public_key(EC_KEY *key, const EC_POINT *pub);
 823
 824 unsigned EC_KEY_get_enc_flags(const EC_KEY *key);
 825 void EC_KEY_set_enc_flags(EC_KEY *eckey, unsigned int flags);
 826 point_conversion_form_t EC_KEY_get_conv_form(const EC_KEY *key);
 827 void EC_KEY_set_conv_form(EC_KEY *eckey, point_conversion_form_t cform);
 828
 829 #define EC_KEY_get_ex_new_index(l, p, newf, dupf, freef) \
 830     CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_EC_KEY, l, p, newf, dupf, freef)
 831 int EC_KEY_set_ex_data(EC_KEY *key, int idx, void *arg);
 832 void *EC_KEY_get_ex_data(const EC_KEY *key, int idx);
 833
 834 /* wrapper functions for the underlying EC_GROUP object */
 835 void EC_KEY_set_asn1_flag(EC_KEY *eckey, int asn1_flag);
 836
 837 /** Creates a table of pre-computed multiples of the generator to
 838  *  accelerate further EC_KEY operations.
 839  *  \param  key  EC_KEY object
 840  *  \param  ctx  BN_CTX object (optional)
 841  *  \return 1 on success and 0 if an error occurred.
 842  */
 843 int EC_KEY_precompute_mult(EC_KEY *key, BN_CTX *ctx);
 844
 845 /** Creates a new ec private (and optional a new public) key.
 846  *  \param  key  EC_KEY object
 847  *  \return 1 on success and 0 if an error occurred.
 848  */
 849 int EC_KEY_generate_key(EC_KEY *key);
 850
 851 /** Verifies that a private and/or public key is valid.
 852  *  \param  key  the EC_KEY object
 853  *  \return 1 on success and 0 otherwise.
 854  */
 855 int EC_KEY_check_key(const EC_KEY *key);
 856
 857 /** Indicates if an EC_KEY can be used for signing.
 858  *  \param  eckey  the EC_KEY object
 859  *  \return 1 if can can sign and 0 otherwise.
 860  */
 861 int EC_KEY_can_sign(const EC_KEY *eckey);
 862
 863 /** Sets a public key from affine coordinates performing
 864  *  necessary NIST PKV tests.
 865  *  \param  key  the EC_KEY object
 866  *  \param  x    public key x coordinate
 867  *  \param  y    public key y coordinate
 868  *  \return 1 on success and 0 otherwise.
 869  */
 870 int EC_KEY_set_public_key_affine_coordinates(EC_KEY *key, BIGNUM *x,
 871                                              BIGNUM *y);
 872
 873 /** Encodes an EC_KEY public key to an allocated octet string
 874  *  \param  key    key to encode
 875  *  \param  form   point conversion form
 876  *  \param  pbuf   returns pointer to allocated buffer
 877  *  \param  ctx    BN_CTX object (optional)
 878  *  \return the length of the encoded octet string or 0 if an error occurred
 879  */
 880 size_t EC_KEY_key2buf(const EC_KEY *key, point_conversion_form_t form,
 881                       unsigned char **pbuf, BN_CTX *ctx);
 882
 883 /** Decodes a EC_KEY public key from a octet string
 884  *  \param  key    key to decode
 885  *  \param  buf    memory buffer with the encoded ec point
 886  *  \param  len    length of the encoded ec point
 887  *  \param  ctx    BN_CTX object (optional)
 888  *  \return 1 on success and 0 if an error occurred
 889  */
 890
 891 int EC_KEY_oct2key(EC_KEY *key, const unsigned char *buf, size_t len,
 892                    BN_CTX *ctx);
 893
 894 /** Decodes an EC_KEY private key from an octet string
 895  *  \param  key    key to decode
 896  *  \param  buf    memory buffer with the encoded private key
 897  *  \param  len    length of the encoded key
 898  *  \return 1 on success and 0 if an error occurred
 899  */
 900
 901 int EC_KEY_oct2priv(EC_KEY *key, const unsigned char *buf, size_t len);
 902
 903 /** Encodes a EC_KEY private key to an octet string
 904  *  \param  key    key to encode
 905  *  \param  buf    memory buffer for the result. If NULL the function returns
 906  *                 required buffer size.
 907  *  \param  len    length of the memory buffer
 908  *  \return the length of the encoded octet string or 0 if an error occurred
 909  */
 910
 911 size_t EC_KEY_priv2oct(const EC_KEY *key, unsigned char *buf, size_t len);
 912
 913 /** Encodes an EC_KEY private key to an allocated octet string
 914  *  \param  eckey  key to encode
 915  *  \param  pbuf   returns pointer to allocated buffer
 916  *  \return the length of the encoded octet string or 0 if an error occurred
 917  */
 918 size_t EC_KEY_priv2buf(const EC_KEY *eckey, unsigned char **pbuf);
 919
 920 /********************************************************************/
 921 /*        de- and encoding functions for SEC1 ECPrivateKey          */
 922 /********************************************************************/
 923
 924 /** Decodes a private key from a memory buffer.
 925  *  \param  key  a pointer to a EC_KEY object which should be used (or NULL)
 926  *  \param  in   pointer to memory with the DER encoded private key
 927  *  \param  len  length of the DER encoded private key
 928  *  \return the decoded private key or NULL if an error occurred.
 929  */
 930 EC_KEY *d2i_ECPrivateKey(EC_KEY **key, const unsigned char **in, long len);
 931
 932 /** Encodes a private key object and stores the result in a buffer.
 933  *  \param  key  the EC_KEY object to encode
 934  *  \param  out  the buffer for the result (if NULL the function returns number
 935  *               of bytes needed).
 936  *  \return 1 on success and 0 if an error occurred.
 937  */
 938 int i2d_ECPrivateKey(EC_KEY *key, unsigned char **out);
 939
 940 /********************************************************************/
 941 /*        de- and encoding functions for EC parameters              */
 942 /********************************************************************/
 943
 944 /** Decodes ec parameter from a memory buffer.
 945  *  \param  key  a pointer to a EC_KEY object which should be used (or NULL)
 946  *  \param  in   pointer to memory with the DER encoded ec parameters
 947  *  \param  len  length of the DER encoded ec parameters
 948  *  \return a EC_KEY object with the decoded parameters or NULL if an error
 949  *          occurred.
 950  */
 951 EC_KEY *d2i_ECParameters(EC_KEY **key, const unsigned char **in, long len);
 952
 953 /** Encodes ec parameter and stores the result in a buffer.
 954  *  \param  key  the EC_KEY object with ec parameters to encode
 955  *  \param  out  the buffer for the result (if NULL the function returns number
 956  *               of bytes needed).
 957  *  \return 1 on success and 0 if an error occurred.
 958  */
 959 int i2d_ECParameters(EC_KEY *key, unsigned char **out);
 960
 961 /********************************************************************/
 962 /*         de- and encoding functions for EC public key             */
 963 /*         (octet string, not DER -- hence 'o2i' and 'i2o')         */
 964 /********************************************************************/
 965
 966 /** Decodes a ec public key from a octet string.
 967  *  \param  key  a pointer to a EC_KEY object which should be used
 968  *  \param  in   memory buffer with the encoded public key
 969  *  \param  len  length of the encoded public key
 970  *  \return EC_KEY object with decoded public key or NULL if an error
 971  *          occurred.
 972  */
 973 EC_KEY *o2i_ECPublicKey(EC_KEY **key, const unsigned char **in, long len);
 974
 975 /** Encodes a ec public key in an octet string.
 976  *  \param  key  the EC_KEY object with the public key
 977  *  \param  out  the buffer for the result (if NULL the function returns number
 978  *               of bytes needed).
 979  *  \return 1 on success and 0 if an error occurred
 980  */
 981 int i2o_ECPublicKey(const EC_KEY *key, unsigned char **out);
 982
 983 /** Prints out the ec parameters on human readable form.
 984  *  \param  bp   BIO object to which the information is printed
 985  *  \param  key  EC_KEY object
 986  *  \return 1 on success and 0 if an error occurred
 987  */
 988 int ECParameters_print(BIO *bp, const EC_KEY *key);
 989
 990 /** Prints out the contents of a EC_KEY object
 991  *  \param  bp   BIO object to which the information is printed
 992  *  \param  key  EC_KEY object
 993  *  \param  off  line offset
 994  *  \return 1 on success and 0 if an error occurred
 995  */
 996 int EC_KEY_print(BIO *bp, const EC_KEY *key, int off);
 997
 998 # ifndef OPENSSL_NO_STDIO
 999 /** Prints out the ec parameters on human readable form.
1000  *  \param  fp   file descriptor to which the information is printed
1001  *  \param  key  EC_KEY object
1002  *  \return 1 on success and 0 if an error occurred
1003  */
1004 int ECParameters_print_fp(FILE *fp, const EC_KEY *key);
1005
1006 /** Prints out the contents of a EC_KEY object
1007  *  \param  fp   file descriptor to which the information is printed
1008  *  \param  key  EC_KEY object
1009  *  \param  off  line offset
1010  *  \return 1 on success and 0 if an error occurred
1011  */
1012 int EC_KEY_print_fp(FILE *fp, const EC_KEY *key, int off);
1013
1014 # endif
1015
1016 const EC_KEY_METHOD *EC_KEY_OpenSSL(void);
1017 const EC_KEY_METHOD *EC_KEY_get_default_method(void);
1018 void EC_KEY_set_default_method(const EC_KEY_METHOD *meth);
1019 const EC_KEY_METHOD *EC_KEY_get_method(const EC_KEY *key);
1020 int EC_KEY_set_method(EC_KEY *key, const EC_KEY_METHOD *meth);
1021 EC_KEY *EC_KEY_new_method(ENGINE *engine);
1022
1023 int ECDH_KDF_X9_62(unsigned char *out, size_t outlen,
1024                    const unsigned char *Z, size_t Zlen,
1025                    const unsigned char *sinfo, size_t sinfolen,
1026                    const EVP_MD *md);
1027
1028 int ECDH_compute_key(void *out, size_t outlen, const EC_POINT *pub_key,
1029                      const EC_KEY *ecdh,
1030                      void *(*KDF) (const void *in, size_t inlen,
1031                                    void *out, size_t *outlen));
1032
1033 typedef struct ECDSA_SIG_st ECDSA_SIG;
1034
1035 /** Allocates and initialize a ECDSA_SIG structure
1036  *  \return pointer to a ECDSA_SIG structure or NULL if an error occurred
1037  */
1038 ECDSA_SIG *ECDSA_SIG_new(void);
1039
1040 /** frees a ECDSA_SIG structure
1041  *  \param  sig  pointer to the ECDSA_SIG structure
1042  */
1043 void ECDSA_SIG_free(ECDSA_SIG *sig);
1044
1045 /** DER encode content of ECDSA_SIG object (note: this function modifies *pp
1046  *  (*pp += length of the DER encoded signature)).
1047  *  \param  sig  pointer to the ECDSA_SIG object
1048  *  \param  pp   pointer to a unsigned char pointer for the output or NULL
1049  *  \return the length of the DER encoded ECDSA_SIG object or 0
1050  */
1051 int i2d_ECDSA_SIG(const ECDSA_SIG *sig, unsigned char **pp);
1052
1053 /** Decodes a DER encoded ECDSA signature (note: this function changes *pp
1054  *  (*pp += len)).
1055  *  \param  sig  pointer to ECDSA_SIG pointer (may be NULL)
1056  *  \param  pp   memory buffer with the DER encoded signature
1057  *  \param  len  length of the buffer
1058  *  \return pointer to the decoded ECDSA_SIG structure (or NULL)
1059  */
1060 ECDSA_SIG *d2i_ECDSA_SIG(ECDSA_SIG **sig, const unsigned char **pp, long len);
1061
1062 /** Accessor for r and s fields of ECDSA_SIG
1063  *  \param  sig  pointer to ECDSA_SIG pointer
1064  *  \param  pr   pointer to BIGNUM pointer for r (may be NULL)
1065  *  \param  ps   pointer to BIGNUM pointer for s (may be NULL)
1066  */
1067 void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps);
1068
1069 /** Setter for r and s fields of ECDSA_SIG
1070  *  \param  sig  pointer to ECDSA_SIG pointer
1071  *  \param  r    pointer to BIGNUM for r (may be NULL)
1072  *  \param  s    pointer to BIGNUM for s (may be NULL)
1073  */
1074 int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s);
1075
1076 /** Computes the ECDSA signature of the given hash value using
1077  *  the supplied private key and returns the created signature.
1078  *  \param  dgst      pointer to the hash value
1079  *  \param  dgst_len  length of the hash value
1080  *  \param  eckey     EC_KEY object containing a private EC key
1081  *  \return pointer to a ECDSA_SIG structure or NULL if an error occurred
1082  */
1083 ECDSA_SIG *ECDSA_do_sign(const unsigned char *dgst, int dgst_len,
1084                          EC_KEY *eckey);
1085
1086 /** Computes ECDSA signature of a given hash value using the supplied
1087  *  private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
1088  *  \param  dgst     pointer to the hash value to sign
1089  *  \param  dgstlen  length of the hash value
1090  *  \param  kinv     BIGNUM with a pre-computed inverse k (optional)
1091  *  \param  rp       BIGNUM with a pre-computed rp value (optional),
1092  *                   see ECDSA_sign_setup
1093  *  \param  eckey    EC_KEY object containing a private EC key
1094  *  \return pointer to a ECDSA_SIG structure or NULL if an error occurred
1095  */
1096 ECDSA_SIG *ECDSA_do_sign_ex(const unsigned char *dgst, int dgstlen,
1097                             const BIGNUM *kinv, const BIGNUM *rp,
1098                             EC_KEY *eckey);
1099
1100 /** Verifies that the supplied signature is a valid ECDSA
1101  *  signature of the supplied hash value using the supplied public key.
1102  *  \param  dgst      pointer to the hash value
1103  *  \param  dgst_len  length of the hash value
1104  *  \param  sig       ECDSA_SIG structure
1105  *  \param  eckey     EC_KEY object containing a public EC key
1106  *  \return 1 if the signature is valid, 0 if the signature is invalid
1107  *          and -1 on error
1108  */
1109 int ECDSA_do_verify(const unsigned char *dgst, int dgst_len,
1110                     const ECDSA_SIG *sig, EC_KEY *eckey);
1111
1112 /** Precompute parts of the signing operation
1113  *  \param  eckey  EC_KEY object containing a private EC key
1114  *  \param  ctx    BN_CTX object (optional)
1115  *  \param  kinv   BIGNUM pointer for the inverse of k
1116  *  \param  rp     BIGNUM pointer for x coordinate of k * generator
1117  *  \return 1 on success and 0 otherwise
1118  */
1119 int ECDSA_sign_setup(EC_KEY *eckey, BN_CTX *ctx, BIGNUM **kinv, BIGNUM **rp);
1120
1121 /** Computes ECDSA signature of a given hash value using the supplied
1122  *  private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
1123  *  \param  type     this parameter is ignored
1124  *  \param  dgst     pointer to the hash value to sign
1125  *  \param  dgstlen  length of the hash value
1126  *  \param  sig      memory for the DER encoded created signature
1127  *  \param  siglen   pointer to the length of the returned signature
1128  *  \param  eckey    EC_KEY object containing a private EC key
1129  *  \return 1 on success and 0 otherwise
1130  */
1131 int ECDSA_sign(int type, const unsigned char *dgst, int dgstlen,
1132                unsigned char *sig, unsigned int *siglen, EC_KEY *eckey);
1133
1134 /** Computes ECDSA signature of a given hash value using the supplied
1135  *  private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
1136  *  \param  type     this parameter is ignored
1137  *  \param  dgst     pointer to the hash value to sign
1138  *  \param  dgstlen  length of the hash value
1139  *  \param  sig      buffer to hold the DER encoded signature
1140  *  \param  siglen   pointer to the length of the returned signature
1141  *  \param  kinv     BIGNUM with a pre-computed inverse k (optional)
1142  *  \param  rp       BIGNUM with a pre-computed rp value (optional),
1143  *                   see ECDSA_sign_setup
1144  *  \param  eckey    EC_KEY object containing a private EC key
1145  *  \return 1 on success and 0 otherwise
1146  */
1147 int ECDSA_sign_ex(int type, const unsigned char *dgst, int dgstlen,
1148                   unsigned char *sig, unsigned int *siglen,
1149                   const BIGNUM *kinv, const BIGNUM *rp, EC_KEY *eckey);
1150
1151 /** Verifies that the given signature is valid ECDSA signature
1152  *  of the supplied hash value using the specified public key.
1153  *  \param  type     this parameter is ignored
1154  *  \param  dgst     pointer to the hash value
1155  *  \param  dgstlen  length of the hash value
1156  *  \param  sig      pointer to the DER encoded signature
1157  *  \param  siglen   length of the DER encoded signature
1158  *  \param  eckey    EC_KEY object containing a public EC key
1159  *  \return 1 if the signature is valid, 0 if the signature is invalid
1160  *          and -1 on error
1161  */
1162 int ECDSA_verify(int type, const unsigned char *dgst, int dgstlen,
1163                  const unsigned char *sig, int siglen, EC_KEY *eckey);
1164
1165 /** Returns the maximum length of the DER encoded signature
1166  *  \param  eckey  EC_KEY object
1167  *  \return numbers of bytes required for the DER encoded signature
1168  */
1169 int ECDSA_size(const EC_KEY *eckey);
1170
1171 /********************************************************************/
1172 /*  EC_KEY_METHOD constructors, destructors, writers and accessors  */
1173 /********************************************************************/
1174
1175 EC_KEY_METHOD *EC_KEY_METHOD_new(const EC_KEY_METHOD *meth);
1176 void EC_KEY_METHOD_free(EC_KEY_METHOD *meth);
1177 void EC_KEY_METHOD_set_init(EC_KEY_METHOD *meth,
1178                             int (*init)(EC_KEY *key),
1179                             void (*finish)(EC_KEY *key),
1180                             int (*copy)(EC_KEY *dest, const EC_KEY *src),
1181                             int (*set_group)(EC_KEY *key, const EC_GROUP *grp),
1182                             int (*set_private)(EC_KEY *key,
1183                                                const BIGNUM *priv_key),
1184                             int (*set_public)(EC_KEY *key,
1185                                               const EC_POINT *pub_key));
1186
1187 void EC_KEY_METHOD_set_keygen(EC_KEY_METHOD *meth,
1188                               int (*keygen)(EC_KEY *key));
1189
1190 void EC_KEY_METHOD_set_compute_key(EC_KEY_METHOD *meth,
1191                                    int (*ckey)(unsigned char **psec,
1192                                                size_t *pseclen,
1193                                                const EC_POINT *pub_key,
1194                                                const EC_KEY *ecdh));
1195
1196 void EC_KEY_METHOD_set_sign(EC_KEY_METHOD *meth,
1197                             int (*sign)(int type, const unsigned char *dgst,
1198                                         int dlen, unsigned char *sig,
1199                                         unsigned int *siglen,
1200                                         const BIGNUM *kinv, const BIGNUM *r,
1201                                         EC_KEY *eckey),
1202                             int (*sign_setup)(EC_KEY *eckey, BN_CTX *ctx_in,
1203                                               BIGNUM **kinvp, BIGNUM **rp),
1204                             ECDSA_SIG *(*sign_sig)(const unsigned char *dgst,
1205                                                    int dgst_len,
1206                                                    const BIGNUM *in_kinv,
1207                                                    const BIGNUM *in_r,
1208                                                    EC_KEY *eckey));
1209
1210 void EC_KEY_METHOD_set_verify(EC_KEY_METHOD *meth,
1211                               int (*verify)(int type, const unsigned
1212                                             char *dgst, int dgst_len,
1213                                             const unsigned char *sigbuf,
1214                                             int sig_len, EC_KEY *eckey),
1215                               int (*verify_sig)(const unsigned char *dgst,
1216                                                 int dgst_len,
1217                                                 const ECDSA_SIG *sig,
1218                                                 EC_KEY *eckey));
1219
1220 void EC_KEY_METHOD_get_init(const EC_KEY_METHOD *meth,
1221                             int (**pinit)(EC_KEY *key),
1222                             void (**pfinish)(EC_KEY *key),
1223                             int (**pcopy)(EC_KEY *dest, const EC_KEY *src),
1224                             int (**pset_group)(EC_KEY *key,
1225                                                const EC_GROUP *grp),
1226                             int (**pset_private)(EC_KEY *key,
1227                                                  const BIGNUM *priv_key),
1228                             int (**pset_public)(EC_KEY *key,
1229                                                 const EC_POINT *pub_key));
1230
1231 void EC_KEY_METHOD_get_keygen(const EC_KEY_METHOD *meth,
1232                               int (**pkeygen)(EC_KEY *key));
1233
1234 void EC_KEY_METHOD_get_compute_key(const EC_KEY_METHOD *meth,
1235                                    int (**pck)(unsigned char **psec,
1236                                                size_t *pseclen,
1237                                                const EC_POINT *pub_key,
1238                                                const EC_KEY *ecdh));
1239
1240 void EC_KEY_METHOD_get_sign(const EC_KEY_METHOD *meth,
1241                             int (**psign)(int type, const unsigned char *dgst,
1242                                           int dlen, unsigned char *sig,
1243                                           unsigned int *siglen,
1244                                           const BIGNUM *kinv, const BIGNUM *r,
1245                                           EC_KEY *eckey),
1246                             int (**psign_setup)(EC_KEY *eckey, BN_CTX *ctx_in,
1247                                                 BIGNUM **kinvp, BIGNUM **rp),
1248                             ECDSA_SIG *(**psign_sig)(const unsigned char *dgst,
1249                                                      int dgst_len,
1250                                                      const BIGNUM *in_kinv,
1251                                                      const BIGNUM *in_r,
1252                                                      EC_KEY *eckey));
1253
1254 void EC_KEY_METHOD_get_verify(const EC_KEY_METHOD *meth,
1255                               int (**pverify)(int type, const unsigned
1256                                               char *dgst, int dgst_len,
1257                                               const unsigned char *sigbuf,
1258                                               int sig_len, EC_KEY *eckey),
1259                               int (**pverify_sig)(const unsigned char *dgst,
1260                                                   int dgst_len,
1261                                                   const ECDSA_SIG *sig,
1262                                                   EC_KEY *eckey));
1263
1264 # define ECParameters_dup(x) ASN1_dup_of(EC_KEY,i2d_ECParameters,d2i_ECParameters,x)
1265
1266 # ifndef __cplusplus
1267 #  if defined(__SUNPRO_C)
1268 #   if __SUNPRO_C >= 0x520
1269 #    pragma error_messages (default,E_ARRAY_OF_INCOMPLETE_NONAME,E_ARRAY_OF_INCOMPLETE)
1270 #   endif
1271 #  endif
1272 # endif
1273
1274 # define EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx, nid) \
1275         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
1276                                 EVP_PKEY_OP_PARAMGEN|EVP_PKEY_OP_KEYGEN, \
1277                                 EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID, nid, NULL)
1278
1279 # define EVP_PKEY_CTX_set_ec_param_enc(ctx, flag) \
1280         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
1281                                 EVP_PKEY_OP_PARAMGEN|EVP_PKEY_OP_KEYGEN, \
1282                                 EVP_PKEY_CTRL_EC_PARAM_ENC, flag, NULL)
1283
1284 # define EVP_PKEY_CTX_set_ecdh_cofactor_mode(ctx, flag) \
1285         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
1286                                 EVP_PKEY_OP_DERIVE, \
1287                                 EVP_PKEY_CTRL_EC_ECDH_COFACTOR, flag, NULL)
1288
1289 # define EVP_PKEY_CTX_get_ecdh_cofactor_mode(ctx) \
1290         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
1291                                 EVP_PKEY_OP_DERIVE, \
1292                                 EVP_PKEY_CTRL_EC_ECDH_COFACTOR, -2, NULL)
1293
1294 # define EVP_PKEY_CTX_set_ecdh_kdf_type(ctx, kdf) \
1295         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
1296                                 EVP_PKEY_OP_DERIVE, \
1297                                 EVP_PKEY_CTRL_EC_KDF_TYPE, kdf, NULL)
1298
1299 # define EVP_PKEY_CTX_get_ecdh_kdf_type(ctx) \
1300         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
1301                                 EVP_PKEY_OP_DERIVE, \
1302                                 EVP_PKEY_CTRL_EC_KDF_TYPE, -2, NULL)
1303
1304 # define EVP_PKEY_CTX_set_ecdh_kdf_md(ctx, md) \
1305         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
1306                                 EVP_PKEY_OP_DERIVE, \
1307                                 EVP_PKEY_CTRL_EC_KDF_MD, 0, (void *)(md))
1308
1309 # define EVP_PKEY_CTX_get_ecdh_kdf_md(ctx, pmd) \
1310         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
1311                                 EVP_PKEY_OP_DERIVE, \
1312                                 EVP_PKEY_CTRL_GET_EC_KDF_MD, 0, (void *)(pmd))
1313
1314 # define EVP_PKEY_CTX_set_ecdh_kdf_outlen(ctx, len) \
1315         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
1316                                 EVP_PKEY_OP_DERIVE, \
1317                                 EVP_PKEY_CTRL_EC_KDF_OUTLEN, len, NULL)
1318
1319 # define EVP_PKEY_CTX_get_ecdh_kdf_outlen(ctx, plen) \
1320         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
1321                                 EVP_PKEY_OP_DERIVE, \
1322                                 EVP_PKEY_CTRL_GET_EC_KDF_OUTLEN, 0, \
1323                                 (void *)(plen))
1324
1325 # define EVP_PKEY_CTX_set0_ecdh_kdf_ukm(ctx, p, plen) \
1326         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
1327                                 EVP_PKEY_OP_DERIVE, \
1328                                 EVP_PKEY_CTRL_EC_KDF_UKM, plen, (void *)(p))
1329
1330 # define EVP_PKEY_CTX_get0_ecdh_kdf_ukm(ctx, p) \
1331         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \
1332                                 EVP_PKEY_OP_DERIVE, \
1333                                 EVP_PKEY_CTRL_GET_EC_KDF_UKM, 0, (void *)(p))
1334
1335 # define EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID             (EVP_PKEY_ALG_CTRL + 1)
1336 # define EVP_PKEY_CTRL_EC_PARAM_ENC                      (EVP_PKEY_ALG_CTRL + 2)
1337 # define EVP_PKEY_CTRL_EC_ECDH_COFACTOR                  (EVP_PKEY_ALG_CTRL + 3)
1338 # define EVP_PKEY_CTRL_EC_KDF_TYPE                       (EVP_PKEY_ALG_CTRL + 4)
1339 # define EVP_PKEY_CTRL_EC_KDF_MD                         (EVP_PKEY_ALG_CTRL + 5)
1340 # define EVP_PKEY_CTRL_GET_EC_KDF_MD                     (EVP_PKEY_ALG_CTRL + 6)
1341 # define EVP_PKEY_CTRL_EC_KDF_OUTLEN                     (EVP_PKEY_ALG_CTRL + 7)
1342 # define EVP_PKEY_CTRL_GET_EC_KDF_OUTLEN                 (EVP_PKEY_ALG_CTRL + 8)
1343 # define EVP_PKEY_CTRL_EC_KDF_UKM                        (EVP_PKEY_ALG_CTRL + 9)
1344 # define EVP_PKEY_CTRL_GET_EC_KDF_UKM                    (EVP_PKEY_ALG_CTRL + 10)
1345 /* KDF types */
1346 # define EVP_PKEY_ECDH_KDF_NONE                          1
1347 # define EVP_PKEY_ECDH_KDF_X9_62                         2
1348
1349 int ERR_load_EC_strings(void);
1350
1351 #  ifdef  __cplusplus
1352 }
1353 #  endif
1354 # endif
1355 #endif