2 * Copyright 2001-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 /* ====================================================================
11 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
13 * Portions of the attached software ("Contribution") are developed by
14 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
16 * The Contribution is licensed pursuant to the OpenSSL open source
17 * license provided above.
19 * The elliptic curve binary polynomial software is originally written by
20 * Sheueling Chang Shantz and Douglas Stebila of Sun Microsystems Laboratories.
26 #include <openssl/obj_mac.h>
27 #include <openssl/ec.h>
28 #include <openssl/bn.h>
32 #if defined(__SUNPRO_C)
33 # if __SUNPRO_C >= 0x520
34 # pragma error_messages (off,E_ARRAY_OF_INCOMPLETE_NONAME,E_ARRAY_OF_INCOMPLETE)
38 /* Use default functions for poin2oct, oct2point and compressed coordinates */
39 #define EC_FLAGS_DEFAULT_OCT 0x1
41 /* Use custom formats for EC_GROUP, EC_POINT and EC_KEY */
42 #define EC_FLAGS_CUSTOM_CURVE 0x2
44 /* Curve does not support signing operations */
45 #define EC_FLAGS_NO_SIGN 0x4
48 * Structure details are not part of the exported interface, so all this may
49 * change in future versions.
53 /* Various method flags */
55 /* used by EC_METHOD_get_field_type: */
56 int field_type; /* a NID */
58 * used by EC_GROUP_new, EC_GROUP_free, EC_GROUP_clear_free,
61 int (*group_init) (EC_GROUP *);
62 void (*group_finish) (EC_GROUP *);
63 void (*group_clear_finish) (EC_GROUP *);
64 int (*group_copy) (EC_GROUP *, const EC_GROUP *);
65 /* used by EC_GROUP_set_curve_GFp, EC_GROUP_get_curve_GFp, */
66 /* EC_GROUP_set_curve_GF2m, and EC_GROUP_get_curve_GF2m: */
67 int (*group_set_curve) (EC_GROUP *, const BIGNUM *p, const BIGNUM *a,
68 const BIGNUM *b, BN_CTX *);
69 int (*group_get_curve) (const EC_GROUP *, BIGNUM *p, BIGNUM *a, BIGNUM *b,
71 /* used by EC_GROUP_get_degree: */
72 int (*group_get_degree) (const EC_GROUP *);
73 int (*group_order_bits) (const EC_GROUP *);
74 /* used by EC_GROUP_check: */
75 int (*group_check_discriminant) (const EC_GROUP *, BN_CTX *);
77 * used by EC_POINT_new, EC_POINT_free, EC_POINT_clear_free,
80 int (*point_init) (EC_POINT *);
81 void (*point_finish) (EC_POINT *);
82 void (*point_clear_finish) (EC_POINT *);
83 int (*point_copy) (EC_POINT *, const EC_POINT *);
85 * used by EC_POINT_set_to_infinity,
86 * EC_POINT_set_Jprojective_coordinates_GFp,
87 * EC_POINT_get_Jprojective_coordinates_GFp,
88 * EC_POINT_set_affine_coordinates_GFp, ..._GF2m,
89 * EC_POINT_get_affine_coordinates_GFp, ..._GF2m,
90 * EC_POINT_set_compressed_coordinates_GFp, ..._GF2m:
92 int (*point_set_to_infinity) (const EC_GROUP *, EC_POINT *);
93 int (*point_set_Jprojective_coordinates_GFp) (const EC_GROUP *,
94 EC_POINT *, const BIGNUM *x,
96 const BIGNUM *z, BN_CTX *);
97 int (*point_get_Jprojective_coordinates_GFp) (const EC_GROUP *,
98 const EC_POINT *, BIGNUM *x,
101 int (*point_set_affine_coordinates) (const EC_GROUP *, EC_POINT *,
102 const BIGNUM *x, const BIGNUM *y,
104 int (*point_get_affine_coordinates) (const EC_GROUP *, const EC_POINT *,
105 BIGNUM *x, BIGNUM *y, BN_CTX *);
106 int (*point_set_compressed_coordinates) (const EC_GROUP *, EC_POINT *,
107 const BIGNUM *x, int y_bit,
109 /* used by EC_POINT_point2oct, EC_POINT_oct2point: */
110 size_t (*point2oct) (const EC_GROUP *, const EC_POINT *,
111 point_conversion_form_t form, unsigned char *buf,
112 size_t len, BN_CTX *);
113 int (*oct2point) (const EC_GROUP *, EC_POINT *, const unsigned char *buf,
114 size_t len, BN_CTX *);
115 /* used by EC_POINT_add, EC_POINT_dbl, ECP_POINT_invert: */
116 int (*add) (const EC_GROUP *, EC_POINT *r, const EC_POINT *a,
117 const EC_POINT *b, BN_CTX *);
118 int (*dbl) (const EC_GROUP *, EC_POINT *r, const EC_POINT *a, BN_CTX *);
119 int (*invert) (const EC_GROUP *, EC_POINT *, BN_CTX *);
121 * used by EC_POINT_is_at_infinity, EC_POINT_is_on_curve, EC_POINT_cmp:
123 int (*is_at_infinity) (const EC_GROUP *, const EC_POINT *);
124 int (*is_on_curve) (const EC_GROUP *, const EC_POINT *, BN_CTX *);
125 int (*point_cmp) (const EC_GROUP *, const EC_POINT *a, const EC_POINT *b,
127 /* used by EC_POINT_make_affine, EC_POINTs_make_affine: */
128 int (*make_affine) (const EC_GROUP *, EC_POINT *, BN_CTX *);
129 int (*points_make_affine) (const EC_GROUP *, size_t num, EC_POINT *[],
132 * used by EC_POINTs_mul, EC_POINT_mul, EC_POINT_precompute_mult,
133 * EC_POINT_have_precompute_mult (default implementations are used if the
134 * 'mul' pointer is 0):
136 int (*mul) (const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
137 size_t num, const EC_POINT *points[], const BIGNUM *scalars[],
139 int (*precompute_mult) (EC_GROUP *group, BN_CTX *);
140 int (*have_precompute_mult) (const EC_GROUP *group);
141 /* internal functions */
143 * 'field_mul', 'field_sqr', and 'field_div' can be used by 'add' and
144 * 'dbl' so that the same implementations of point operations can be used
145 * with different optimized implementations of expensive field
148 int (*field_mul) (const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
149 const BIGNUM *b, BN_CTX *);
150 int (*field_sqr) (const EC_GROUP *, BIGNUM *r, const BIGNUM *a, BN_CTX *);
151 int (*field_div) (const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
152 const BIGNUM *b, BN_CTX *);
153 /* e.g. to Montgomery */
154 int (*field_encode) (const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
156 /* e.g. from Montgomery */
157 int (*field_decode) (const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
159 int (*field_set_to_one) (const EC_GROUP *, BIGNUM *r, BN_CTX *);
160 /* private key operations */
161 size_t (*priv2oct)(const EC_KEY *eckey, unsigned char *buf, size_t len);
162 int (*oct2priv)(EC_KEY *eckey, const unsigned char *buf, size_t len);
163 int (*set_private)(EC_KEY *eckey, const BIGNUM *priv_key);
164 int (*keygen)(EC_KEY *eckey);
165 int (*keycheck)(const EC_KEY *eckey);
166 int (*keygenpub)(EC_KEY *eckey);
167 int (*keycopy)(EC_KEY *dst, const EC_KEY *src);
168 void (*keyfinish)(EC_KEY *eckey);
169 /* custom ECDH operation */
170 int (*ecdh_compute_key)(unsigned char **pout, size_t *poutlen,
171 const EC_POINT *pub_key, const EC_KEY *ecdh);
175 * Types and functions to manipulate pre-computed values.
177 typedef struct nistp224_pre_comp_st NISTP224_PRE_COMP;
178 typedef struct nistp256_pre_comp_st NISTP256_PRE_COMP;
179 typedef struct nistp521_pre_comp_st NISTP521_PRE_COMP;
180 typedef struct nistz256_pre_comp_st NISTZ256_PRE_COMP;
181 typedef struct ec_pre_comp_st EC_PRE_COMP;
184 const EC_METHOD *meth;
185 EC_POINT *generator; /* optional */
186 BIGNUM *order, *cofactor;
187 int curve_name; /* optional NID for named curve */
188 int asn1_flag; /* flag to control the asn1 encoding */
189 point_conversion_form_t asn1_form;
190 unsigned char *seed; /* optional seed for parameters (appears in
194 * The following members are handled by the method functions, even if
195 * they appear generic
198 * Field specification. For curves over GF(p), this is the modulus; for
199 * curves over GF(2^m), this is the irreducible polynomial defining the
204 * Field specification for curves over GF(2^m). The irreducible f(t) is
205 * then of the form: t^poly[0] + t^poly[1] + ... + t^poly[k] where m =
206 * poly[0] > poly[1] > ... > poly[k] = 0. The array is terminated with
207 * poly[k+1]=-1. All elliptic curve irreducibles have at most 5 non-zero
212 * Curve coefficients. (Here the assumption is that BIGNUMs can be used
213 * or abused for all kinds of fields, not just GF(p).) For characteristic
214 * > 3, the curve is defined by a Weierstrass equation of the form y^2 =
215 * x^3 + a*x + b. For characteristic 2, the curve is defined by an
216 * equation of the form y^2 + x*y = x^3 + a*x^2 + b.
219 /* enable optimized point arithmetics for special case */
221 /* method-specific (e.g., Montgomery structure) */
223 /* method-specific */
225 /* method-specific */
226 int (*field_mod_func) (BIGNUM *, const BIGNUM *, const BIGNUM *,
228 /* data for ECDSA inverse */
229 BN_MONT_CTX *mont_data;
231 /* precomputed values for speed. */
234 pct_nistp224, pct_nistp256, pct_nistp521, pct_nistz256,
235 pct_ec } pre_comp_type;
237 NISTP224_PRE_COMP *nistp224;
238 NISTP256_PRE_COMP *nistp256;
239 NISTP521_PRE_COMP *nistp521;
240 NISTZ256_PRE_COMP *nistz256;
245 #define SETPRECOMP(g, type, pre) \
246 g->pre_comp_type = pct_##type, g->pre_comp.type = pre
247 #define HAVEPRECOMP(g, type) \
248 g->pre_comp_type == pct_##type && g->pre_comp.type != NULL
251 const EC_KEY_METHOD *meth;
257 unsigned int enc_flag;
258 point_conversion_form_t conv_form;
261 CRYPTO_EX_DATA ex_data;
266 const EC_METHOD *meth;
268 * All members except 'meth' are handled by the method functions, even if
269 * they appear generic
273 BIGNUM *Z; /* Jacobian projective coordinates: * (X, Y,
274 * Z) represents (X/Z^2, Y/Z^3) if Z != 0 */
275 int Z_is_one; /* enable optimized point arithmetics for
279 NISTP224_PRE_COMP *EC_nistp224_pre_comp_dup(NISTP224_PRE_COMP *);
280 NISTP256_PRE_COMP *EC_nistp256_pre_comp_dup(NISTP256_PRE_COMP *);
281 NISTP521_PRE_COMP *EC_nistp521_pre_comp_dup(NISTP521_PRE_COMP *);
282 NISTZ256_PRE_COMP *EC_nistz256_pre_comp_dup(NISTZ256_PRE_COMP *);
283 NISTP256_PRE_COMP *EC_nistp256_pre_comp_dup(NISTP256_PRE_COMP *);
284 EC_PRE_COMP *EC_ec_pre_comp_dup(EC_PRE_COMP *);
286 void EC_pre_comp_free(EC_GROUP *group);
287 void EC_nistp224_pre_comp_free(NISTP224_PRE_COMP *);
288 void EC_nistp256_pre_comp_free(NISTP256_PRE_COMP *);
289 void EC_nistp521_pre_comp_free(NISTP521_PRE_COMP *);
290 void EC_nistz256_pre_comp_free(NISTZ256_PRE_COMP *);
291 void EC_ec_pre_comp_free(EC_PRE_COMP *);
294 * method functions in ec_mult.c (ec_lib.c uses these as defaults if
295 * group->method->mul is 0)
297 int ec_wNAF_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
298 size_t num, const EC_POINT *points[], const BIGNUM *scalars[],
300 int ec_wNAF_precompute_mult(EC_GROUP *group, BN_CTX *);
301 int ec_wNAF_have_precompute_mult(const EC_GROUP *group);
303 /* method functions in ecp_smpl.c */
304 int ec_GFp_simple_group_init(EC_GROUP *);
305 void ec_GFp_simple_group_finish(EC_GROUP *);
306 void ec_GFp_simple_group_clear_finish(EC_GROUP *);
307 int ec_GFp_simple_group_copy(EC_GROUP *, const EC_GROUP *);
308 int ec_GFp_simple_group_set_curve(EC_GROUP *, const BIGNUM *p,
309 const BIGNUM *a, const BIGNUM *b, BN_CTX *);
310 int ec_GFp_simple_group_get_curve(const EC_GROUP *, BIGNUM *p, BIGNUM *a,
311 BIGNUM *b, BN_CTX *);
312 int ec_GFp_simple_group_get_degree(const EC_GROUP *);
313 int ec_GFp_simple_group_check_discriminant(const EC_GROUP *, BN_CTX *);
314 int ec_GFp_simple_point_init(EC_POINT *);
315 void ec_GFp_simple_point_finish(EC_POINT *);
316 void ec_GFp_simple_point_clear_finish(EC_POINT *);
317 int ec_GFp_simple_point_copy(EC_POINT *, const EC_POINT *);
318 int ec_GFp_simple_point_set_to_infinity(const EC_GROUP *, EC_POINT *);
319 int ec_GFp_simple_set_Jprojective_coordinates_GFp(const EC_GROUP *,
320 EC_POINT *, const BIGNUM *x,
322 const BIGNUM *z, BN_CTX *);
323 int ec_GFp_simple_get_Jprojective_coordinates_GFp(const EC_GROUP *,
324 const EC_POINT *, BIGNUM *x,
325 BIGNUM *y, BIGNUM *z,
327 int ec_GFp_simple_point_set_affine_coordinates(const EC_GROUP *, EC_POINT *,
329 const BIGNUM *y, BN_CTX *);
330 int ec_GFp_simple_point_get_affine_coordinates(const EC_GROUP *,
331 const EC_POINT *, BIGNUM *x,
332 BIGNUM *y, BN_CTX *);
333 int ec_GFp_simple_set_compressed_coordinates(const EC_GROUP *, EC_POINT *,
334 const BIGNUM *x, int y_bit,
336 size_t ec_GFp_simple_point2oct(const EC_GROUP *, const EC_POINT *,
337 point_conversion_form_t form,
338 unsigned char *buf, size_t len, BN_CTX *);
339 int ec_GFp_simple_oct2point(const EC_GROUP *, EC_POINT *,
340 const unsigned char *buf, size_t len, BN_CTX *);
341 int ec_GFp_simple_add(const EC_GROUP *, EC_POINT *r, const EC_POINT *a,
342 const EC_POINT *b, BN_CTX *);
343 int ec_GFp_simple_dbl(const EC_GROUP *, EC_POINT *r, const EC_POINT *a,
345 int ec_GFp_simple_invert(const EC_GROUP *, EC_POINT *, BN_CTX *);
346 int ec_GFp_simple_is_at_infinity(const EC_GROUP *, const EC_POINT *);
347 int ec_GFp_simple_is_on_curve(const EC_GROUP *, const EC_POINT *, BN_CTX *);
348 int ec_GFp_simple_cmp(const EC_GROUP *, const EC_POINT *a, const EC_POINT *b,
350 int ec_GFp_simple_make_affine(const EC_GROUP *, EC_POINT *, BN_CTX *);
351 int ec_GFp_simple_points_make_affine(const EC_GROUP *, size_t num,
352 EC_POINT *[], BN_CTX *);
353 int ec_GFp_simple_field_mul(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
354 const BIGNUM *b, BN_CTX *);
355 int ec_GFp_simple_field_sqr(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
358 /* method functions in ecp_mont.c */
359 int ec_GFp_mont_group_init(EC_GROUP *);
360 int ec_GFp_mont_group_set_curve(EC_GROUP *, const BIGNUM *p, const BIGNUM *a,
361 const BIGNUM *b, BN_CTX *);
362 void ec_GFp_mont_group_finish(EC_GROUP *);
363 void ec_GFp_mont_group_clear_finish(EC_GROUP *);
364 int ec_GFp_mont_group_copy(EC_GROUP *, const EC_GROUP *);
365 int ec_GFp_mont_field_mul(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
366 const BIGNUM *b, BN_CTX *);
367 int ec_GFp_mont_field_sqr(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
369 int ec_GFp_mont_field_encode(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
371 int ec_GFp_mont_field_decode(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
373 int ec_GFp_mont_field_set_to_one(const EC_GROUP *, BIGNUM *r, BN_CTX *);
375 /* method functions in ecp_nist.c */
376 int ec_GFp_nist_group_copy(EC_GROUP *dest, const EC_GROUP *src);
377 int ec_GFp_nist_group_set_curve(EC_GROUP *, const BIGNUM *p, const BIGNUM *a,
378 const BIGNUM *b, BN_CTX *);
379 int ec_GFp_nist_field_mul(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
380 const BIGNUM *b, BN_CTX *);
381 int ec_GFp_nist_field_sqr(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
384 /* method functions in ec2_smpl.c */
385 int ec_GF2m_simple_group_init(EC_GROUP *);
386 void ec_GF2m_simple_group_finish(EC_GROUP *);
387 void ec_GF2m_simple_group_clear_finish(EC_GROUP *);
388 int ec_GF2m_simple_group_copy(EC_GROUP *, const EC_GROUP *);
389 int ec_GF2m_simple_group_set_curve(EC_GROUP *, const BIGNUM *p,
390 const BIGNUM *a, const BIGNUM *b,
392 int ec_GF2m_simple_group_get_curve(const EC_GROUP *, BIGNUM *p, BIGNUM *a,
393 BIGNUM *b, BN_CTX *);
394 int ec_GF2m_simple_group_get_degree(const EC_GROUP *);
395 int ec_GF2m_simple_group_check_discriminant(const EC_GROUP *, BN_CTX *);
396 int ec_GF2m_simple_point_init(EC_POINT *);
397 void ec_GF2m_simple_point_finish(EC_POINT *);
398 void ec_GF2m_simple_point_clear_finish(EC_POINT *);
399 int ec_GF2m_simple_point_copy(EC_POINT *, const EC_POINT *);
400 int ec_GF2m_simple_point_set_to_infinity(const EC_GROUP *, EC_POINT *);
401 int ec_GF2m_simple_point_set_affine_coordinates(const EC_GROUP *, EC_POINT *,
403 const BIGNUM *y, BN_CTX *);
404 int ec_GF2m_simple_point_get_affine_coordinates(const EC_GROUP *,
405 const EC_POINT *, BIGNUM *x,
406 BIGNUM *y, BN_CTX *);
407 int ec_GF2m_simple_set_compressed_coordinates(const EC_GROUP *, EC_POINT *,
408 const BIGNUM *x, int y_bit,
410 size_t ec_GF2m_simple_point2oct(const EC_GROUP *, const EC_POINT *,
411 point_conversion_form_t form,
412 unsigned char *buf, size_t len, BN_CTX *);
413 int ec_GF2m_simple_oct2point(const EC_GROUP *, EC_POINT *,
414 const unsigned char *buf, size_t len, BN_CTX *);
415 int ec_GF2m_simple_add(const EC_GROUP *, EC_POINT *r, const EC_POINT *a,
416 const EC_POINT *b, BN_CTX *);
417 int ec_GF2m_simple_dbl(const EC_GROUP *, EC_POINT *r, const EC_POINT *a,
419 int ec_GF2m_simple_invert(const EC_GROUP *, EC_POINT *, BN_CTX *);
420 int ec_GF2m_simple_is_at_infinity(const EC_GROUP *, const EC_POINT *);
421 int ec_GF2m_simple_is_on_curve(const EC_GROUP *, const EC_POINT *, BN_CTX *);
422 int ec_GF2m_simple_cmp(const EC_GROUP *, const EC_POINT *a, const EC_POINT *b,
424 int ec_GF2m_simple_make_affine(const EC_GROUP *, EC_POINT *, BN_CTX *);
425 int ec_GF2m_simple_points_make_affine(const EC_GROUP *, size_t num,
426 EC_POINT *[], BN_CTX *);
427 int ec_GF2m_simple_field_mul(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
428 const BIGNUM *b, BN_CTX *);
429 int ec_GF2m_simple_field_sqr(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
431 int ec_GF2m_simple_field_div(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
432 const BIGNUM *b, BN_CTX *);
434 /* method functions in ec2_mult.c */
435 int ec_GF2m_simple_mul(const EC_GROUP *group, EC_POINT *r,
436 const BIGNUM *scalar, size_t num,
437 const EC_POINT *points[], const BIGNUM *scalars[],
439 int ec_GF2m_precompute_mult(EC_GROUP *group, BN_CTX *ctx);
440 int ec_GF2m_have_precompute_mult(const EC_GROUP *group);
442 #ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
443 /* method functions in ecp_nistp224.c */
444 int ec_GFp_nistp224_group_init(EC_GROUP *group);
445 int ec_GFp_nistp224_group_set_curve(EC_GROUP *group, const BIGNUM *p,
446 const BIGNUM *a, const BIGNUM *n,
448 int ec_GFp_nistp224_point_get_affine_coordinates(const EC_GROUP *group,
449 const EC_POINT *point,
450 BIGNUM *x, BIGNUM *y,
452 int ec_GFp_nistp224_mul(const EC_GROUP *group, EC_POINT *r,
453 const BIGNUM *scalar, size_t num,
454 const EC_POINT *points[], const BIGNUM *scalars[],
456 int ec_GFp_nistp224_points_mul(const EC_GROUP *group, EC_POINT *r,
457 const BIGNUM *scalar, size_t num,
458 const EC_POINT *points[],
459 const BIGNUM *scalars[], BN_CTX *ctx);
460 int ec_GFp_nistp224_precompute_mult(EC_GROUP *group, BN_CTX *ctx);
461 int ec_GFp_nistp224_have_precompute_mult(const EC_GROUP *group);
463 /* method functions in ecp_nistp256.c */
464 int ec_GFp_nistp256_group_init(EC_GROUP *group);
465 int ec_GFp_nistp256_group_set_curve(EC_GROUP *group, const BIGNUM *p,
466 const BIGNUM *a, const BIGNUM *n,
468 int ec_GFp_nistp256_point_get_affine_coordinates(const EC_GROUP *group,
469 const EC_POINT *point,
470 BIGNUM *x, BIGNUM *y,
472 int ec_GFp_nistp256_mul(const EC_GROUP *group, EC_POINT *r,
473 const BIGNUM *scalar, size_t num,
474 const EC_POINT *points[], const BIGNUM *scalars[],
476 int ec_GFp_nistp256_points_mul(const EC_GROUP *group, EC_POINT *r,
477 const BIGNUM *scalar, size_t num,
478 const EC_POINT *points[],
479 const BIGNUM *scalars[], BN_CTX *ctx);
480 int ec_GFp_nistp256_precompute_mult(EC_GROUP *group, BN_CTX *ctx);
481 int ec_GFp_nistp256_have_precompute_mult(const EC_GROUP *group);
483 /* method functions in ecp_nistp521.c */
484 int ec_GFp_nistp521_group_init(EC_GROUP *group);
485 int ec_GFp_nistp521_group_set_curve(EC_GROUP *group, const BIGNUM *p,
486 const BIGNUM *a, const BIGNUM *n,
488 int ec_GFp_nistp521_point_get_affine_coordinates(const EC_GROUP *group,
489 const EC_POINT *point,
490 BIGNUM *x, BIGNUM *y,
492 int ec_GFp_nistp521_mul(const EC_GROUP *group, EC_POINT *r,
493 const BIGNUM *scalar, size_t num,
494 const EC_POINT *points[], const BIGNUM *scalars[],
496 int ec_GFp_nistp521_points_mul(const EC_GROUP *group, EC_POINT *r,
497 const BIGNUM *scalar, size_t num,
498 const EC_POINT *points[],
499 const BIGNUM *scalars[], BN_CTX *ctx);
500 int ec_GFp_nistp521_precompute_mult(EC_GROUP *group, BN_CTX *ctx);
501 int ec_GFp_nistp521_have_precompute_mult(const EC_GROUP *group);
503 /* utility functions in ecp_nistputil.c */
504 void ec_GFp_nistp_points_make_affine_internal(size_t num, void *point_array,
507 void (*felem_one) (void *out),
508 int (*felem_is_zero) (const void
510 void (*felem_assign) (void *out,
513 void (*felem_square) (void *out,
516 void (*felem_mul) (void *out,
521 void (*felem_inv) (void *out,
524 void (*felem_contract) (void
529 void ec_GFp_nistp_recode_scalar_bits(unsigned char *sign,
530 unsigned char *digit, unsigned char in);
532 int ec_precompute_mont_data(EC_GROUP *);
533 int ec_group_simple_order_bits(const EC_GROUP *group);
535 #ifdef ECP_NISTZ256_ASM
536 /** Returns GFp methods using montgomery multiplication, with x86-64 optimized
537 * P256. See http://eprint.iacr.org/2013/816.
538 * \return EC_METHOD object
540 const EC_METHOD *EC_GFp_nistz256_method(void);
543 size_t ec_key_simple_priv2oct(const EC_KEY *eckey,
544 unsigned char *buf, size_t len);
545 int ec_key_simple_oct2priv(EC_KEY *eckey, const unsigned char *buf, size_t len);
546 int ec_key_simple_generate_key(EC_KEY *eckey);
547 int ec_key_simple_generate_public_key(EC_KEY *eckey);
548 int ec_key_simple_check_key(const EC_KEY *eckey);
550 /* EC_METHOD definitions */
552 struct ec_key_method_st {
555 int (*init)(EC_KEY *key);
556 void (*finish)(EC_KEY *key);
557 int (*copy)(EC_KEY *dest, const EC_KEY *src);
558 int (*set_group)(EC_KEY *key, const EC_GROUP *grp);
559 int (*set_private)(EC_KEY *key, const BIGNUM *priv_key);
560 int (*set_public)(EC_KEY *key, const EC_POINT *pub_key);
561 int (*keygen)(EC_KEY *key);
562 int (*compute_key)(unsigned char **pout, size_t *poutlen,
563 const EC_POINT *pub_key, const EC_KEY *ecdh);
564 int (*sign)(int type, const unsigned char *dgst, int dlen, unsigned char
565 *sig, unsigned int *siglen, const BIGNUM *kinv,
566 const BIGNUM *r, EC_KEY *eckey);
567 int (*sign_setup)(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp,
569 ECDSA_SIG *(*sign_sig)(const unsigned char *dgst, int dgst_len,
570 const BIGNUM *in_kinv, const BIGNUM *in_r,
573 int (*verify)(int type, const unsigned char *dgst, int dgst_len,
574 const unsigned char *sigbuf, int sig_len, EC_KEY *eckey);
575 int (*verify_sig)(const unsigned char *dgst, int dgst_len,
576 const ECDSA_SIG *sig, EC_KEY *eckey);
577 } /* EC_KEY_METHOD */ ;
579 #define EC_KEY_METHOD_DYNAMIC 1
581 int ossl_ec_key_gen(EC_KEY *eckey);
582 int ossl_ecdh_compute_key(unsigned char **pout, size_t *poutlen,
583 const EC_POINT *pub_key, const EC_KEY *ecdh);
584 int ecdh_simple_compute_key(unsigned char **pout, size_t *poutlen,
585 const EC_POINT *pub_key, const EC_KEY *ecdh);
587 struct ECDSA_SIG_st {
592 int ossl_ecdsa_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp,
594 int ossl_ecdsa_sign(int type, const unsigned char *dgst, int dlen,
595 unsigned char *sig, unsigned int *siglen,
596 const BIGNUM *kinv, const BIGNUM *r, EC_KEY *eckey);
597 ECDSA_SIG *ossl_ecdsa_sign_sig(const unsigned char *dgst, int dgst_len,
598 const BIGNUM *in_kinv, const BIGNUM *in_r,
600 int ossl_ecdsa_verify(int type, const unsigned char *dgst, int dgst_len,
601 const unsigned char *sigbuf, int sig_len, EC_KEY *eckey);
602 int ossl_ecdsa_verify_sig(const unsigned char *dgst, int dgst_len,
603 const ECDSA_SIG *sig, EC_KEY *eckey);
605 int X25519(uint8_t out_shared_key[32], const uint8_t private_key[32],
606 const uint8_t peer_public_value[32]);
607 void X25519_public_from_private(uint8_t out_public_value[32],
608 const uint8_t private_key[32]);