2 * Copyright 2001-2017 The OpenSSL Project Authors. All Rights Reserved.
3 * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
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
13 #include <openssl/obj_mac.h>
14 #include <openssl/ec.h>
15 #include <openssl/bn.h>
16 #include "internal/refcount.h"
18 #if defined(__SUNPRO_C)
19 # if __SUNPRO_C >= 0x520
20 # pragma error_messages (off,E_ARRAY_OF_INCOMPLETE_NONAME,E_ARRAY_OF_INCOMPLETE)
24 /* Use default functions for poin2oct, oct2point and compressed coordinates */
25 #define EC_FLAGS_DEFAULT_OCT 0x1
27 /* Use custom formats for EC_GROUP, EC_POINT and EC_KEY */
28 #define EC_FLAGS_CUSTOM_CURVE 0x2
30 /* Curve does not support signing operations */
31 #define EC_FLAGS_NO_SIGN 0x4
34 * Structure details are not part of the exported interface, so all this may
35 * change in future versions.
39 /* Various method flags */
41 /* used by EC_METHOD_get_field_type: */
42 int field_type; /* a NID */
44 * used by EC_GROUP_new, EC_GROUP_free, EC_GROUP_clear_free,
47 int (*group_init) (EC_GROUP *);
48 void (*group_finish) (EC_GROUP *);
49 void (*group_clear_finish) (EC_GROUP *);
50 int (*group_copy) (EC_GROUP *, const EC_GROUP *);
51 /* used by EC_GROUP_set_curve_GFp, EC_GROUP_get_curve_GFp, */
52 /* EC_GROUP_set_curve_GF2m, and EC_GROUP_get_curve_GF2m: */
53 int (*group_set_curve) (EC_GROUP *, const BIGNUM *p, const BIGNUM *a,
54 const BIGNUM *b, BN_CTX *);
55 int (*group_get_curve) (const EC_GROUP *, BIGNUM *p, BIGNUM *a, BIGNUM *b,
57 /* used by EC_GROUP_get_degree: */
58 int (*group_get_degree) (const EC_GROUP *);
59 int (*group_order_bits) (const EC_GROUP *);
60 /* used by EC_GROUP_check: */
61 int (*group_check_discriminant) (const EC_GROUP *, BN_CTX *);
63 * used by EC_POINT_new, EC_POINT_free, EC_POINT_clear_free,
66 int (*point_init) (EC_POINT *);
67 void (*point_finish) (EC_POINT *);
68 void (*point_clear_finish) (EC_POINT *);
69 int (*point_copy) (EC_POINT *, const EC_POINT *);
71 * used by EC_POINT_set_to_infinity,
72 * EC_POINT_set_Jprojective_coordinates_GFp,
73 * EC_POINT_get_Jprojective_coordinates_GFp,
74 * EC_POINT_set_affine_coordinates_GFp, ..._GF2m,
75 * EC_POINT_get_affine_coordinates_GFp, ..._GF2m,
76 * EC_POINT_set_compressed_coordinates_GFp, ..._GF2m:
78 int (*point_set_to_infinity) (const EC_GROUP *, EC_POINT *);
79 int (*point_set_Jprojective_coordinates_GFp) (const EC_GROUP *,
80 EC_POINT *, const BIGNUM *x,
82 const BIGNUM *z, BN_CTX *);
83 int (*point_get_Jprojective_coordinates_GFp) (const EC_GROUP *,
84 const EC_POINT *, BIGNUM *x,
87 int (*point_set_affine_coordinates) (const EC_GROUP *, EC_POINT *,
88 const BIGNUM *x, const BIGNUM *y,
90 int (*point_get_affine_coordinates) (const EC_GROUP *, const EC_POINT *,
91 BIGNUM *x, BIGNUM *y, BN_CTX *);
92 int (*point_set_compressed_coordinates) (const EC_GROUP *, EC_POINT *,
93 const BIGNUM *x, int y_bit,
95 /* used by EC_POINT_point2oct, EC_POINT_oct2point: */
96 size_t (*point2oct) (const EC_GROUP *, const EC_POINT *,
97 point_conversion_form_t form, unsigned char *buf,
98 size_t len, BN_CTX *);
99 int (*oct2point) (const EC_GROUP *, EC_POINT *, const unsigned char *buf,
100 size_t len, BN_CTX *);
101 /* used by EC_POINT_add, EC_POINT_dbl, ECP_POINT_invert: */
102 int (*add) (const EC_GROUP *, EC_POINT *r, const EC_POINT *a,
103 const EC_POINT *b, BN_CTX *);
104 int (*dbl) (const EC_GROUP *, EC_POINT *r, const EC_POINT *a, BN_CTX *);
105 int (*invert) (const EC_GROUP *, EC_POINT *, BN_CTX *);
107 * used by EC_POINT_is_at_infinity, EC_POINT_is_on_curve, EC_POINT_cmp:
109 int (*is_at_infinity) (const EC_GROUP *, const EC_POINT *);
110 int (*is_on_curve) (const EC_GROUP *, const EC_POINT *, BN_CTX *);
111 int (*point_cmp) (const EC_GROUP *, const EC_POINT *a, const EC_POINT *b,
113 /* used by EC_POINT_make_affine, EC_POINTs_make_affine: */
114 int (*make_affine) (const EC_GROUP *, EC_POINT *, BN_CTX *);
115 int (*points_make_affine) (const EC_GROUP *, size_t num, EC_POINT *[],
118 * used by EC_POINTs_mul, EC_POINT_mul, EC_POINT_precompute_mult,
119 * EC_POINT_have_precompute_mult (default implementations are used if the
120 * 'mul' pointer is 0):
122 int (*mul) (const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
123 size_t num, const EC_POINT *points[], const BIGNUM *scalars[],
125 int (*precompute_mult) (EC_GROUP *group, BN_CTX *);
126 int (*have_precompute_mult) (const EC_GROUP *group);
127 /* internal functions */
129 * 'field_mul', 'field_sqr', and 'field_div' can be used by 'add' and
130 * 'dbl' so that the same implementations of point operations can be used
131 * with different optimized implementations of expensive field
134 int (*field_mul) (const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
135 const BIGNUM *b, BN_CTX *);
136 int (*field_sqr) (const EC_GROUP *, BIGNUM *r, const BIGNUM *a, BN_CTX *);
137 int (*field_div) (const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
138 const BIGNUM *b, BN_CTX *);
139 /* e.g. to Montgomery */
140 int (*field_encode) (const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
142 /* e.g. from Montgomery */
143 int (*field_decode) (const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
145 int (*field_set_to_one) (const EC_GROUP *, BIGNUM *r, BN_CTX *);
146 /* private key operations */
147 size_t (*priv2oct)(const EC_KEY *eckey, unsigned char *buf, size_t len);
148 int (*oct2priv)(EC_KEY *eckey, const unsigned char *buf, size_t len);
149 int (*set_private)(EC_KEY *eckey, const BIGNUM *priv_key);
150 int (*keygen)(EC_KEY *eckey);
151 int (*keycheck)(const EC_KEY *eckey);
152 int (*keygenpub)(EC_KEY *eckey);
153 int (*keycopy)(EC_KEY *dst, const EC_KEY *src);
154 void (*keyfinish)(EC_KEY *eckey);
155 /* custom ECDH operation */
156 int (*ecdh_compute_key)(unsigned char **pout, size_t *poutlen,
157 const EC_POINT *pub_key, const EC_KEY *ecdh);
161 * Types and functions to manipulate pre-computed values.
163 typedef struct nistp224_pre_comp_st NISTP224_PRE_COMP;
164 typedef struct nistp256_pre_comp_st NISTP256_PRE_COMP;
165 typedef struct nistp521_pre_comp_st NISTP521_PRE_COMP;
166 typedef struct nistz256_pre_comp_st NISTZ256_PRE_COMP;
167 typedef struct ec_pre_comp_st EC_PRE_COMP;
170 const EC_METHOD *meth;
171 EC_POINT *generator; /* optional */
172 BIGNUM *order, *cofactor;
173 int curve_name; /* optional NID for named curve */
174 int asn1_flag; /* flag to control the asn1 encoding */
175 point_conversion_form_t asn1_form;
176 unsigned char *seed; /* optional seed for parameters (appears in
180 * The following members are handled by the method functions, even if
181 * they appear generic
184 * Field specification. For curves over GF(p), this is the modulus; for
185 * curves over GF(2^m), this is the irreducible polynomial defining the
190 * Field specification for curves over GF(2^m). The irreducible f(t) is
191 * then of the form: t^poly[0] + t^poly[1] + ... + t^poly[k] where m =
192 * poly[0] > poly[1] > ... > poly[k] = 0. The array is terminated with
193 * poly[k+1]=-1. All elliptic curve irreducibles have at most 5 non-zero
198 * Curve coefficients. (Here the assumption is that BIGNUMs can be used
199 * or abused for all kinds of fields, not just GF(p).) For characteristic
200 * > 3, the curve is defined by a Weierstrass equation of the form y^2 =
201 * x^3 + a*x + b. For characteristic 2, the curve is defined by an
202 * equation of the form y^2 + x*y = x^3 + a*x^2 + b.
205 /* enable optimized point arithmetics for special case */
207 /* method-specific (e.g., Montgomery structure) */
209 /* method-specific */
211 /* method-specific */
212 int (*field_mod_func) (BIGNUM *, const BIGNUM *, const BIGNUM *,
214 /* data for ECDSA inverse */
215 BN_MONT_CTX *mont_data;
218 * Precomputed values for speed. The PCT_xxx names match the
219 * pre_comp.xxx union names; see the SETPRECOMP and HAVEPRECOMP
224 PCT_nistp224, PCT_nistp256, PCT_nistp521, PCT_nistz256,
228 NISTP224_PRE_COMP *nistp224;
229 NISTP256_PRE_COMP *nistp256;
230 NISTP521_PRE_COMP *nistp521;
231 NISTZ256_PRE_COMP *nistz256;
236 #define SETPRECOMP(g, type, pre) \
237 g->pre_comp_type = PCT_##type, g->pre_comp.type = pre
238 #define HAVEPRECOMP(g, type) \
239 g->pre_comp_type == PCT_##type && g->pre_comp.type != NULL
242 const EC_KEY_METHOD *meth;
248 unsigned int enc_flag;
249 point_conversion_form_t conv_form;
250 CRYPTO_REF_COUNT references;
252 CRYPTO_EX_DATA ex_data;
257 const EC_METHOD *meth;
259 * All members except 'meth' are handled by the method functions, even if
260 * they appear generic
264 BIGNUM *Z; /* Jacobian projective coordinates: * (X, Y,
265 * Z) represents (X/Z^2, Y/Z^3) if Z != 0 */
266 int Z_is_one; /* enable optimized point arithmetics for
270 NISTP224_PRE_COMP *EC_nistp224_pre_comp_dup(NISTP224_PRE_COMP *);
271 NISTP256_PRE_COMP *EC_nistp256_pre_comp_dup(NISTP256_PRE_COMP *);
272 NISTP521_PRE_COMP *EC_nistp521_pre_comp_dup(NISTP521_PRE_COMP *);
273 NISTZ256_PRE_COMP *EC_nistz256_pre_comp_dup(NISTZ256_PRE_COMP *);
274 NISTP256_PRE_COMP *EC_nistp256_pre_comp_dup(NISTP256_PRE_COMP *);
275 EC_PRE_COMP *EC_ec_pre_comp_dup(EC_PRE_COMP *);
277 void EC_pre_comp_free(EC_GROUP *group);
278 void EC_nistp224_pre_comp_free(NISTP224_PRE_COMP *);
279 void EC_nistp256_pre_comp_free(NISTP256_PRE_COMP *);
280 void EC_nistp521_pre_comp_free(NISTP521_PRE_COMP *);
281 void EC_nistz256_pre_comp_free(NISTZ256_PRE_COMP *);
282 void EC_ec_pre_comp_free(EC_PRE_COMP *);
285 * method functions in ec_mult.c (ec_lib.c uses these as defaults if
286 * group->method->mul is 0)
288 int ec_wNAF_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
289 size_t num, const EC_POINT *points[], const BIGNUM *scalars[],
291 int ec_wNAF_precompute_mult(EC_GROUP *group, BN_CTX *);
292 int ec_wNAF_have_precompute_mult(const EC_GROUP *group);
294 /* method functions in ecp_smpl.c */
295 int ec_GFp_simple_group_init(EC_GROUP *);
296 void ec_GFp_simple_group_finish(EC_GROUP *);
297 void ec_GFp_simple_group_clear_finish(EC_GROUP *);
298 int ec_GFp_simple_group_copy(EC_GROUP *, const EC_GROUP *);
299 int ec_GFp_simple_group_set_curve(EC_GROUP *, const BIGNUM *p,
300 const BIGNUM *a, const BIGNUM *b, BN_CTX *);
301 int ec_GFp_simple_group_get_curve(const EC_GROUP *, BIGNUM *p, BIGNUM *a,
302 BIGNUM *b, BN_CTX *);
303 int ec_GFp_simple_group_get_degree(const EC_GROUP *);
304 int ec_GFp_simple_group_check_discriminant(const EC_GROUP *, BN_CTX *);
305 int ec_GFp_simple_point_init(EC_POINT *);
306 void ec_GFp_simple_point_finish(EC_POINT *);
307 void ec_GFp_simple_point_clear_finish(EC_POINT *);
308 int ec_GFp_simple_point_copy(EC_POINT *, const EC_POINT *);
309 int ec_GFp_simple_point_set_to_infinity(const EC_GROUP *, EC_POINT *);
310 int ec_GFp_simple_set_Jprojective_coordinates_GFp(const EC_GROUP *,
311 EC_POINT *, const BIGNUM *x,
313 const BIGNUM *z, BN_CTX *);
314 int ec_GFp_simple_get_Jprojective_coordinates_GFp(const EC_GROUP *,
315 const EC_POINT *, BIGNUM *x,
316 BIGNUM *y, BIGNUM *z,
318 int ec_GFp_simple_point_set_affine_coordinates(const EC_GROUP *, EC_POINT *,
320 const BIGNUM *y, BN_CTX *);
321 int ec_GFp_simple_point_get_affine_coordinates(const EC_GROUP *,
322 const EC_POINT *, BIGNUM *x,
323 BIGNUM *y, BN_CTX *);
324 int ec_GFp_simple_set_compressed_coordinates(const EC_GROUP *, EC_POINT *,
325 const BIGNUM *x, int y_bit,
327 size_t ec_GFp_simple_point2oct(const EC_GROUP *, const EC_POINT *,
328 point_conversion_form_t form,
329 unsigned char *buf, size_t len, BN_CTX *);
330 int ec_GFp_simple_oct2point(const EC_GROUP *, EC_POINT *,
331 const unsigned char *buf, size_t len, BN_CTX *);
332 int ec_GFp_simple_add(const EC_GROUP *, EC_POINT *r, const EC_POINT *a,
333 const EC_POINT *b, BN_CTX *);
334 int ec_GFp_simple_dbl(const EC_GROUP *, EC_POINT *r, const EC_POINT *a,
336 int ec_GFp_simple_invert(const EC_GROUP *, EC_POINT *, BN_CTX *);
337 int ec_GFp_simple_is_at_infinity(const EC_GROUP *, const EC_POINT *);
338 int ec_GFp_simple_is_on_curve(const EC_GROUP *, const EC_POINT *, BN_CTX *);
339 int ec_GFp_simple_cmp(const EC_GROUP *, const EC_POINT *a, const EC_POINT *b,
341 int ec_GFp_simple_make_affine(const EC_GROUP *, EC_POINT *, BN_CTX *);
342 int ec_GFp_simple_points_make_affine(const EC_GROUP *, size_t num,
343 EC_POINT *[], BN_CTX *);
344 int ec_GFp_simple_field_mul(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
345 const BIGNUM *b, BN_CTX *);
346 int ec_GFp_simple_field_sqr(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
349 /* method functions in ecp_mont.c */
350 int ec_GFp_mont_group_init(EC_GROUP *);
351 int ec_GFp_mont_group_set_curve(EC_GROUP *, const BIGNUM *p, const BIGNUM *a,
352 const BIGNUM *b, BN_CTX *);
353 void ec_GFp_mont_group_finish(EC_GROUP *);
354 void ec_GFp_mont_group_clear_finish(EC_GROUP *);
355 int ec_GFp_mont_group_copy(EC_GROUP *, const EC_GROUP *);
356 int ec_GFp_mont_field_mul(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
357 const BIGNUM *b, BN_CTX *);
358 int ec_GFp_mont_field_sqr(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
360 int ec_GFp_mont_field_encode(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
362 int ec_GFp_mont_field_decode(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
364 int ec_GFp_mont_field_set_to_one(const EC_GROUP *, BIGNUM *r, BN_CTX *);
366 /* method functions in ecp_nist.c */
367 int ec_GFp_nist_group_copy(EC_GROUP *dest, const EC_GROUP *src);
368 int ec_GFp_nist_group_set_curve(EC_GROUP *, const BIGNUM *p, const BIGNUM *a,
369 const BIGNUM *b, BN_CTX *);
370 int ec_GFp_nist_field_mul(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
371 const BIGNUM *b, BN_CTX *);
372 int ec_GFp_nist_field_sqr(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
375 /* method functions in ec2_smpl.c */
376 int ec_GF2m_simple_group_init(EC_GROUP *);
377 void ec_GF2m_simple_group_finish(EC_GROUP *);
378 void ec_GF2m_simple_group_clear_finish(EC_GROUP *);
379 int ec_GF2m_simple_group_copy(EC_GROUP *, const EC_GROUP *);
380 int ec_GF2m_simple_group_set_curve(EC_GROUP *, const BIGNUM *p,
381 const BIGNUM *a, const BIGNUM *b,
383 int ec_GF2m_simple_group_get_curve(const EC_GROUP *, BIGNUM *p, BIGNUM *a,
384 BIGNUM *b, BN_CTX *);
385 int ec_GF2m_simple_group_get_degree(const EC_GROUP *);
386 int ec_GF2m_simple_group_check_discriminant(const EC_GROUP *, BN_CTX *);
387 int ec_GF2m_simple_point_init(EC_POINT *);
388 void ec_GF2m_simple_point_finish(EC_POINT *);
389 void ec_GF2m_simple_point_clear_finish(EC_POINT *);
390 int ec_GF2m_simple_point_copy(EC_POINT *, const EC_POINT *);
391 int ec_GF2m_simple_point_set_to_infinity(const EC_GROUP *, EC_POINT *);
392 int ec_GF2m_simple_point_set_affine_coordinates(const EC_GROUP *, EC_POINT *,
394 const BIGNUM *y, BN_CTX *);
395 int ec_GF2m_simple_point_get_affine_coordinates(const EC_GROUP *,
396 const EC_POINT *, BIGNUM *x,
397 BIGNUM *y, BN_CTX *);
398 int ec_GF2m_simple_set_compressed_coordinates(const EC_GROUP *, EC_POINT *,
399 const BIGNUM *x, int y_bit,
401 size_t ec_GF2m_simple_point2oct(const EC_GROUP *, const EC_POINT *,
402 point_conversion_form_t form,
403 unsigned char *buf, size_t len, BN_CTX *);
404 int ec_GF2m_simple_oct2point(const EC_GROUP *, EC_POINT *,
405 const unsigned char *buf, size_t len, BN_CTX *);
406 int ec_GF2m_simple_add(const EC_GROUP *, EC_POINT *r, const EC_POINT *a,
407 const EC_POINT *b, BN_CTX *);
408 int ec_GF2m_simple_dbl(const EC_GROUP *, EC_POINT *r, const EC_POINT *a,
410 int ec_GF2m_simple_invert(const EC_GROUP *, EC_POINT *, BN_CTX *);
411 int ec_GF2m_simple_is_at_infinity(const EC_GROUP *, const EC_POINT *);
412 int ec_GF2m_simple_is_on_curve(const EC_GROUP *, const EC_POINT *, BN_CTX *);
413 int ec_GF2m_simple_cmp(const EC_GROUP *, const EC_POINT *a, const EC_POINT *b,
415 int ec_GF2m_simple_make_affine(const EC_GROUP *, EC_POINT *, BN_CTX *);
416 int ec_GF2m_simple_points_make_affine(const EC_GROUP *, size_t num,
417 EC_POINT *[], BN_CTX *);
418 int ec_GF2m_simple_field_mul(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
419 const BIGNUM *b, BN_CTX *);
420 int ec_GF2m_simple_field_sqr(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
422 int ec_GF2m_simple_field_div(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
423 const BIGNUM *b, BN_CTX *);
425 /* method functions in ec2_mult.c */
426 int ec_GF2m_simple_mul(const EC_GROUP *group, EC_POINT *r,
427 const BIGNUM *scalar, size_t num,
428 const EC_POINT *points[], const BIGNUM *scalars[],
430 int ec_GF2m_precompute_mult(EC_GROUP *group, BN_CTX *ctx);
431 int ec_GF2m_have_precompute_mult(const EC_GROUP *group);
433 #ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
434 /* method functions in ecp_nistp224.c */
435 int ec_GFp_nistp224_group_init(EC_GROUP *group);
436 int ec_GFp_nistp224_group_set_curve(EC_GROUP *group, const BIGNUM *p,
437 const BIGNUM *a, const BIGNUM *n,
439 int ec_GFp_nistp224_point_get_affine_coordinates(const EC_GROUP *group,
440 const EC_POINT *point,
441 BIGNUM *x, BIGNUM *y,
443 int ec_GFp_nistp224_mul(const EC_GROUP *group, EC_POINT *r,
444 const BIGNUM *scalar, size_t num,
445 const EC_POINT *points[], const BIGNUM *scalars[],
447 int ec_GFp_nistp224_points_mul(const EC_GROUP *group, EC_POINT *r,
448 const BIGNUM *scalar, size_t num,
449 const EC_POINT *points[],
450 const BIGNUM *scalars[], BN_CTX *ctx);
451 int ec_GFp_nistp224_precompute_mult(EC_GROUP *group, BN_CTX *ctx);
452 int ec_GFp_nistp224_have_precompute_mult(const EC_GROUP *group);
454 /* method functions in ecp_nistp256.c */
455 int ec_GFp_nistp256_group_init(EC_GROUP *group);
456 int ec_GFp_nistp256_group_set_curve(EC_GROUP *group, const BIGNUM *p,
457 const BIGNUM *a, const BIGNUM *n,
459 int ec_GFp_nistp256_point_get_affine_coordinates(const EC_GROUP *group,
460 const EC_POINT *point,
461 BIGNUM *x, BIGNUM *y,
463 int ec_GFp_nistp256_mul(const EC_GROUP *group, EC_POINT *r,
464 const BIGNUM *scalar, size_t num,
465 const EC_POINT *points[], const BIGNUM *scalars[],
467 int ec_GFp_nistp256_points_mul(const EC_GROUP *group, EC_POINT *r,
468 const BIGNUM *scalar, size_t num,
469 const EC_POINT *points[],
470 const BIGNUM *scalars[], BN_CTX *ctx);
471 int ec_GFp_nistp256_precompute_mult(EC_GROUP *group, BN_CTX *ctx);
472 int ec_GFp_nistp256_have_precompute_mult(const EC_GROUP *group);
474 /* method functions in ecp_nistp521.c */
475 int ec_GFp_nistp521_group_init(EC_GROUP *group);
476 int ec_GFp_nistp521_group_set_curve(EC_GROUP *group, const BIGNUM *p,
477 const BIGNUM *a, const BIGNUM *n,
479 int ec_GFp_nistp521_point_get_affine_coordinates(const EC_GROUP *group,
480 const EC_POINT *point,
481 BIGNUM *x, BIGNUM *y,
483 int ec_GFp_nistp521_mul(const EC_GROUP *group, EC_POINT *r,
484 const BIGNUM *scalar, size_t num,
485 const EC_POINT *points[], const BIGNUM *scalars[],
487 int ec_GFp_nistp521_points_mul(const EC_GROUP *group, EC_POINT *r,
488 const BIGNUM *scalar, size_t num,
489 const EC_POINT *points[],
490 const BIGNUM *scalars[], BN_CTX *ctx);
491 int ec_GFp_nistp521_precompute_mult(EC_GROUP *group, BN_CTX *ctx);
492 int ec_GFp_nistp521_have_precompute_mult(const EC_GROUP *group);
494 /* utility functions in ecp_nistputil.c */
495 void ec_GFp_nistp_points_make_affine_internal(size_t num, void *point_array,
498 void (*felem_one) (void *out),
499 int (*felem_is_zero) (const void
501 void (*felem_assign) (void *out,
504 void (*felem_square) (void *out,
507 void (*felem_mul) (void *out,
512 void (*felem_inv) (void *out,
515 void (*felem_contract) (void
520 void ec_GFp_nistp_recode_scalar_bits(unsigned char *sign,
521 unsigned char *digit, unsigned char in);
523 int ec_precompute_mont_data(EC_GROUP *);
524 int ec_group_simple_order_bits(const EC_GROUP *group);
526 #ifdef ECP_NISTZ256_ASM
527 /** Returns GFp methods using montgomery multiplication, with x86-64 optimized
528 * P256. See http://eprint.iacr.org/2013/816.
529 * \return EC_METHOD object
531 const EC_METHOD *EC_GFp_nistz256_method(void);
534 size_t ec_key_simple_priv2oct(const EC_KEY *eckey,
535 unsigned char *buf, size_t len);
536 int ec_key_simple_oct2priv(EC_KEY *eckey, const unsigned char *buf, size_t len);
537 int ec_key_simple_generate_key(EC_KEY *eckey);
538 int ec_key_simple_generate_public_key(EC_KEY *eckey);
539 int ec_key_simple_check_key(const EC_KEY *eckey);
541 /* EC_METHOD definitions */
543 struct ec_key_method_st {
546 int (*init)(EC_KEY *key);
547 void (*finish)(EC_KEY *key);
548 int (*copy)(EC_KEY *dest, const EC_KEY *src);
549 int (*set_group)(EC_KEY *key, const EC_GROUP *grp);
550 int (*set_private)(EC_KEY *key, const BIGNUM *priv_key);
551 int (*set_public)(EC_KEY *key, const EC_POINT *pub_key);
552 int (*keygen)(EC_KEY *key);
553 int (*compute_key)(unsigned char **pout, size_t *poutlen,
554 const EC_POINT *pub_key, const EC_KEY *ecdh);
555 int (*sign)(int type, const unsigned char *dgst, int dlen, unsigned char
556 *sig, unsigned int *siglen, const BIGNUM *kinv,
557 const BIGNUM *r, EC_KEY *eckey);
558 int (*sign_setup)(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp,
560 ECDSA_SIG *(*sign_sig)(const unsigned char *dgst, int dgst_len,
561 const BIGNUM *in_kinv, const BIGNUM *in_r,
564 int (*verify)(int type, const unsigned char *dgst, int dgst_len,
565 const unsigned char *sigbuf, int sig_len, EC_KEY *eckey);
566 int (*verify_sig)(const unsigned char *dgst, int dgst_len,
567 const ECDSA_SIG *sig, EC_KEY *eckey);
570 #define EC_KEY_METHOD_DYNAMIC 1
572 int ossl_ec_key_gen(EC_KEY *eckey);
573 int ossl_ecdh_compute_key(unsigned char **pout, size_t *poutlen,
574 const EC_POINT *pub_key, const EC_KEY *ecdh);
575 int ecdh_simple_compute_key(unsigned char **pout, size_t *poutlen,
576 const EC_POINT *pub_key, const EC_KEY *ecdh);
578 struct ECDSA_SIG_st {
583 int ossl_ecdsa_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp,
585 int ossl_ecdsa_sign(int type, const unsigned char *dgst, int dlen,
586 unsigned char *sig, unsigned int *siglen,
587 const BIGNUM *kinv, const BIGNUM *r, EC_KEY *eckey);
588 ECDSA_SIG *ossl_ecdsa_sign_sig(const unsigned char *dgst, int dgst_len,
589 const BIGNUM *in_kinv, const BIGNUM *in_r,
591 int ossl_ecdsa_verify(int type, const unsigned char *dgst, int dgst_len,
592 const unsigned char *sigbuf, int sig_len, EC_KEY *eckey);
593 int ossl_ecdsa_verify_sig(const unsigned char *dgst, int dgst_len,
594 const ECDSA_SIG *sig, EC_KEY *eckey);
596 int ED25519_sign(uint8_t *out_sig, const uint8_t *message, size_t message_len,
597 const uint8_t public_key[32], const uint8_t private_key[32]);
598 int ED25519_verify(const uint8_t *message, size_t message_len,
599 const uint8_t signature[64], const uint8_t public_key[32]);
600 void ED25519_public_from_private(uint8_t out_public_key[32],
601 const uint8_t private_key[32]);
603 int X25519(uint8_t out_shared_key[32], const uint8_t private_key[32],
604 const uint8_t peer_public_value[32]);
605 void X25519_public_from_private(uint8_t out_public_value[32],
606 const uint8_t private_key[32]);