2 * Copyright 2001-2020 The OpenSSL Project Authors. All Rights Reserved.
3 * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
5 * Licensed under the Apache License 2.0 (the "License"). You may not use
6 * this file except in compliance with the License. You can obtain a copy
7 * in the file LICENSE in the source distribution or at
8 * https://www.openssl.org/source/license.html
13 #include <openssl/obj_mac.h>
14 #include <openssl/ec.h>
15 #include <openssl/bn.h>
16 #include "internal/refcount.h"
17 #include "crypto/ec.h"
19 #if defined(__SUNPRO_C)
20 # if __SUNPRO_C >= 0x520
21 # pragma error_messages (off,E_ARRAY_OF_INCOMPLETE_NONAME,E_ARRAY_OF_INCOMPLETE)
25 /* Use default functions for poin2oct, oct2point and compressed coordinates */
26 #define EC_FLAGS_DEFAULT_OCT 0x1
28 /* Use custom formats for EC_GROUP, EC_POINT and EC_KEY */
29 #define EC_FLAGS_CUSTOM_CURVE 0x2
31 /* Curve does not support signing operations */
32 #define EC_FLAGS_NO_SIGN 0x4
35 * Structure details are not part of the exported interface, so all this may
36 * change in future versions.
40 /* Various method flags */
42 /* used by EC_METHOD_get_field_type: */
43 int field_type; /* a NID */
45 * used by EC_GROUP_new, EC_GROUP_free, EC_GROUP_clear_free,
48 int (*group_init) (EC_GROUP *);
49 void (*group_finish) (EC_GROUP *);
50 void (*group_clear_finish) (EC_GROUP *);
51 int (*group_copy) (EC_GROUP *, const EC_GROUP *);
52 /* used by EC_GROUP_set_curve, EC_GROUP_get_curve: */
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,
75 * EC_POINT_get_affine_coordinates,
76 * EC_POINT_set_compressed_coordinates:
78 int (*point_set_to_infinity) (const EC_GROUP *, EC_POINT *);
79 int (*point_set_affine_coordinates) (const EC_GROUP *, EC_POINT *,
80 const BIGNUM *x, const BIGNUM *y,
82 int (*point_get_affine_coordinates) (const EC_GROUP *, const EC_POINT *,
83 BIGNUM *x, BIGNUM *y, BN_CTX *);
84 int (*point_set_compressed_coordinates) (const EC_GROUP *, EC_POINT *,
85 const BIGNUM *x, int y_bit,
87 /* used by EC_POINT_point2oct, EC_POINT_oct2point: */
88 size_t (*point2oct) (const EC_GROUP *, const EC_POINT *,
89 point_conversion_form_t form, unsigned char *buf,
90 size_t len, BN_CTX *);
91 int (*oct2point) (const EC_GROUP *, EC_POINT *, const unsigned char *buf,
92 size_t len, BN_CTX *);
93 /* used by EC_POINT_add, EC_POINT_dbl, ECP_POINT_invert: */
94 int (*add) (const EC_GROUP *, EC_POINT *r, const EC_POINT *a,
95 const EC_POINT *b, BN_CTX *);
96 int (*dbl) (const EC_GROUP *, EC_POINT *r, const EC_POINT *a, BN_CTX *);
97 int (*invert) (const EC_GROUP *, EC_POINT *, BN_CTX *);
99 * used by EC_POINT_is_at_infinity, EC_POINT_is_on_curve, EC_POINT_cmp:
101 int (*is_at_infinity) (const EC_GROUP *, const EC_POINT *);
102 int (*is_on_curve) (const EC_GROUP *, const EC_POINT *, BN_CTX *);
103 int (*point_cmp) (const EC_GROUP *, const EC_POINT *a, const EC_POINT *b,
105 /* used by EC_POINT_make_affine, EC_POINTs_make_affine: */
106 int (*make_affine) (const EC_GROUP *, EC_POINT *, BN_CTX *);
107 int (*points_make_affine) (const EC_GROUP *, size_t num, EC_POINT *[],
110 * used by EC_POINTs_mul, EC_POINT_mul, EC_POINT_precompute_mult,
111 * EC_POINT_have_precompute_mult (default implementations are used if the
112 * 'mul' pointer is 0):
115 * mul() calculates the value
117 * r := generator * scalar
118 * + points[0] * scalars[0]
120 * + points[num-1] * scalars[num-1].
122 * For a fixed point multiplication (scalar != NULL, num == 0)
123 * or a variable point multiplication (scalar == NULL, num == 1),
124 * mul() must use a constant time algorithm: in both cases callers
125 * should provide an input scalar (either scalar or scalars[0])
126 * in the range [0, ec_group_order); for robustness, implementers
127 * should handle the case when the scalar has not been reduced, but
128 * may treat it as an unusual input, without any constant-timeness
131 int (*mul) (const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
132 size_t num, const EC_POINT *points[], const BIGNUM *scalars[],
134 int (*precompute_mult) (EC_GROUP *group, BN_CTX *);
135 int (*have_precompute_mult) (const EC_GROUP *group);
136 /* internal functions */
138 * 'field_mul', 'field_sqr', and 'field_div' can be used by 'add' and
139 * 'dbl' so that the same implementations of point operations can be used
140 * with different optimized implementations of expensive field
143 int (*field_mul) (const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
144 const BIGNUM *b, BN_CTX *);
145 int (*field_sqr) (const EC_GROUP *, BIGNUM *r, const BIGNUM *a, BN_CTX *);
146 int (*field_div) (const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
147 const BIGNUM *b, BN_CTX *);
149 * 'field_inv' computes the multiplicative inverse of a in the field,
150 * storing the result in r.
152 * If 'a' is zero (or equivalent), you'll get an EC_R_CANNOT_INVERT error.
154 int (*field_inv) (const EC_GROUP *, BIGNUM *r, const BIGNUM *a, BN_CTX *);
155 /* e.g. to Montgomery */
156 int (*field_encode) (const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
158 /* e.g. from Montgomery */
159 int (*field_decode) (const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
161 int (*field_set_to_one) (const EC_GROUP *, BIGNUM *r, BN_CTX *);
162 /* private key operations */
163 size_t (*priv2oct)(const EC_KEY *eckey, unsigned char *buf, size_t len);
164 int (*oct2priv)(EC_KEY *eckey, const unsigned char *buf, size_t len);
165 int (*set_private)(EC_KEY *eckey, const BIGNUM *priv_key);
166 int (*keygen)(EC_KEY *eckey);
167 int (*keycheck)(const EC_KEY *eckey);
168 int (*keygenpub)(EC_KEY *eckey);
169 int (*keycopy)(EC_KEY *dst, const EC_KEY *src);
170 void (*keyfinish)(EC_KEY *eckey);
171 /* custom ECDH operation */
172 int (*ecdh_compute_key)(unsigned char **pout, size_t *poutlen,
173 const EC_POINT *pub_key, const EC_KEY *ecdh);
175 int (*ecdsa_sign_setup)(EC_KEY *eckey, BN_CTX *ctx, BIGNUM **kinvp,
177 ECDSA_SIG *(*ecdsa_sign_sig)(const unsigned char *dgst, int dgstlen,
178 const BIGNUM *kinv, const BIGNUM *r,
180 int (*ecdsa_verify_sig)(const unsigned char *dgst, int dgstlen,
181 const ECDSA_SIG *sig, EC_KEY *eckey);
182 /* Inverse modulo order */
183 int (*field_inverse_mod_ord)(const EC_GROUP *, BIGNUM *r,
184 const BIGNUM *x, BN_CTX *);
185 int (*blind_coordinates)(const EC_GROUP *group, EC_POINT *p, BN_CTX *ctx);
186 int (*ladder_pre)(const EC_GROUP *group,
187 EC_POINT *r, EC_POINT *s,
188 EC_POINT *p, BN_CTX *ctx);
189 int (*ladder_step)(const EC_GROUP *group,
190 EC_POINT *r, EC_POINT *s,
191 EC_POINT *p, BN_CTX *ctx);
192 int (*ladder_post)(const EC_GROUP *group,
193 EC_POINT *r, EC_POINT *s,
194 EC_POINT *p, BN_CTX *ctx);
198 * Types and functions to manipulate pre-computed values.
200 typedef struct nistp224_pre_comp_st NISTP224_PRE_COMP;
201 typedef struct nistp256_pre_comp_st NISTP256_PRE_COMP;
202 typedef struct nistp521_pre_comp_st NISTP521_PRE_COMP;
203 typedef struct nistz256_pre_comp_st NISTZ256_PRE_COMP;
204 typedef struct ec_pre_comp_st EC_PRE_COMP;
207 const EC_METHOD *meth;
208 EC_POINT *generator; /* optional */
209 BIGNUM *order, *cofactor;
210 int curve_name; /* optional NID for named curve */
211 int asn1_flag; /* flag to control the asn1 encoding */
212 point_conversion_form_t asn1_form;
213 unsigned char *seed; /* optional seed for parameters (appears in
217 * The following members are handled by the method functions, even if
218 * they appear generic
221 * Field specification. For curves over GF(p), this is the modulus; for
222 * curves over GF(2^m), this is the irreducible polynomial defining the
227 * Field specification for curves over GF(2^m). The irreducible f(t) is
228 * then of the form: t^poly[0] + t^poly[1] + ... + t^poly[k] where m =
229 * poly[0] > poly[1] > ... > poly[k] = 0. The array is terminated with
230 * poly[k+1]=-1. All elliptic curve irreducibles have at most 5 non-zero
235 * Curve coefficients. (Here the assumption is that BIGNUMs can be used
236 * or abused for all kinds of fields, not just GF(p).) For characteristic
237 * > 3, the curve is defined by a Weierstrass equation of the form y^2 =
238 * x^3 + a*x + b. For characteristic 2, the curve is defined by an
239 * equation of the form y^2 + x*y = x^3 + a*x^2 + b.
242 /* enable optimized point arithmetics for special case */
244 /* method-specific (e.g., Montgomery structure) */
246 /* method-specific */
248 /* method-specific */
249 int (*field_mod_func) (BIGNUM *, const BIGNUM *, const BIGNUM *,
251 /* data for ECDSA inverse */
252 BN_MONT_CTX *mont_data;
255 * Precomputed values for speed. The PCT_xxx names match the
256 * pre_comp.xxx union names; see the SETPRECOMP and HAVEPRECOMP
261 PCT_nistp224, PCT_nistp256, PCT_nistp521, PCT_nistz256,
265 NISTP224_PRE_COMP *nistp224;
266 NISTP256_PRE_COMP *nistp256;
267 NISTP521_PRE_COMP *nistp521;
268 NISTZ256_PRE_COMP *nistz256;
275 #define SETPRECOMP(g, type, pre) \
276 g->pre_comp_type = PCT_##type, g->pre_comp.type = pre
277 #define HAVEPRECOMP(g, type) \
278 g->pre_comp_type == PCT_##type && g->pre_comp.type != NULL
281 const EC_KEY_METHOD *meth;
287 unsigned int enc_flag;
288 point_conversion_form_t conv_form;
289 CRYPTO_REF_COUNT references;
292 CRYPTO_EX_DATA ex_data;
298 size_t dirty_cnt; /* If any key material changes, increment this */
302 const EC_METHOD *meth;
303 /* NID for the curve if known */
306 * All members except 'meth' are handled by the method functions, even if
307 * they appear generic
311 BIGNUM *Z; /* Jacobian projective coordinates: * (X, Y,
312 * Z) represents (X/Z^2, Y/Z^3) if Z != 0 */
313 int Z_is_one; /* enable optimized point arithmetics for
317 static ossl_inline int ec_point_is_compat(const EC_POINT *point,
318 const EC_GROUP *group)
320 return group->meth == point->meth
321 && (group->curve_name == 0
322 || point->curve_name == 0
323 || group->curve_name == point->curve_name);
326 NISTP224_PRE_COMP *EC_nistp224_pre_comp_dup(NISTP224_PRE_COMP *);
327 NISTP256_PRE_COMP *EC_nistp256_pre_comp_dup(NISTP256_PRE_COMP *);
328 NISTP521_PRE_COMP *EC_nistp521_pre_comp_dup(NISTP521_PRE_COMP *);
329 NISTZ256_PRE_COMP *EC_nistz256_pre_comp_dup(NISTZ256_PRE_COMP *);
330 NISTP256_PRE_COMP *EC_nistp256_pre_comp_dup(NISTP256_PRE_COMP *);
331 EC_PRE_COMP *EC_ec_pre_comp_dup(EC_PRE_COMP *);
333 void EC_pre_comp_free(EC_GROUP *group);
334 void EC_nistp224_pre_comp_free(NISTP224_PRE_COMP *);
335 void EC_nistp256_pre_comp_free(NISTP256_PRE_COMP *);
336 void EC_nistp521_pre_comp_free(NISTP521_PRE_COMP *);
337 void EC_nistz256_pre_comp_free(NISTZ256_PRE_COMP *);
338 void EC_ec_pre_comp_free(EC_PRE_COMP *);
341 * method functions in ec_mult.c (ec_lib.c uses these as defaults if
342 * group->method->mul is 0)
344 int ec_wNAF_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
345 size_t num, const EC_POINT *points[], const BIGNUM *scalars[],
347 int ec_wNAF_precompute_mult(EC_GROUP *group, BN_CTX *);
348 int ec_wNAF_have_precompute_mult(const EC_GROUP *group);
350 /* method functions in ecp_smpl.c */
351 int ec_GFp_simple_group_init(EC_GROUP *);
352 void ec_GFp_simple_group_finish(EC_GROUP *);
353 void ec_GFp_simple_group_clear_finish(EC_GROUP *);
354 int ec_GFp_simple_group_copy(EC_GROUP *, const EC_GROUP *);
355 int ec_GFp_simple_group_set_curve(EC_GROUP *, const BIGNUM *p,
356 const BIGNUM *a, const BIGNUM *b, BN_CTX *);
357 int ec_GFp_simple_group_get_curve(const EC_GROUP *, BIGNUM *p, BIGNUM *a,
358 BIGNUM *b, BN_CTX *);
359 int ec_GFp_simple_group_get_degree(const EC_GROUP *);
360 int ec_GFp_simple_group_check_discriminant(const EC_GROUP *, BN_CTX *);
361 int ec_GFp_simple_point_init(EC_POINT *);
362 void ec_GFp_simple_point_finish(EC_POINT *);
363 void ec_GFp_simple_point_clear_finish(EC_POINT *);
364 int ec_GFp_simple_point_copy(EC_POINT *, const EC_POINT *);
365 int ec_GFp_simple_point_set_to_infinity(const EC_GROUP *, EC_POINT *);
366 int ec_GFp_simple_set_Jprojective_coordinates_GFp(const EC_GROUP *,
367 EC_POINT *, const BIGNUM *x,
369 const BIGNUM *z, BN_CTX *);
370 int ec_GFp_simple_get_Jprojective_coordinates_GFp(const EC_GROUP *,
371 const EC_POINT *, BIGNUM *x,
372 BIGNUM *y, BIGNUM *z,
374 int ec_GFp_simple_point_set_affine_coordinates(const EC_GROUP *, EC_POINT *,
376 const BIGNUM *y, BN_CTX *);
377 int ec_GFp_simple_point_get_affine_coordinates(const EC_GROUP *,
378 const EC_POINT *, BIGNUM *x,
379 BIGNUM *y, BN_CTX *);
380 int ec_GFp_simple_set_compressed_coordinates(const EC_GROUP *, EC_POINT *,
381 const BIGNUM *x, int y_bit,
383 size_t ec_GFp_simple_point2oct(const EC_GROUP *, const EC_POINT *,
384 point_conversion_form_t form,
385 unsigned char *buf, size_t len, BN_CTX *);
386 int ec_GFp_simple_oct2point(const EC_GROUP *, EC_POINT *,
387 const unsigned char *buf, size_t len, BN_CTX *);
388 int ec_GFp_simple_add(const EC_GROUP *, EC_POINT *r, const EC_POINT *a,
389 const EC_POINT *b, BN_CTX *);
390 int ec_GFp_simple_dbl(const EC_GROUP *, EC_POINT *r, const EC_POINT *a,
392 int ec_GFp_simple_invert(const EC_GROUP *, EC_POINT *, BN_CTX *);
393 int ec_GFp_simple_is_at_infinity(const EC_GROUP *, const EC_POINT *);
394 int ec_GFp_simple_is_on_curve(const EC_GROUP *, const EC_POINT *, BN_CTX *);
395 int ec_GFp_simple_cmp(const EC_GROUP *, const EC_POINT *a, const EC_POINT *b,
397 int ec_GFp_simple_make_affine(const EC_GROUP *, EC_POINT *, BN_CTX *);
398 int ec_GFp_simple_points_make_affine(const EC_GROUP *, size_t num,
399 EC_POINT *[], BN_CTX *);
400 int ec_GFp_simple_field_mul(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
401 const BIGNUM *b, BN_CTX *);
402 int ec_GFp_simple_field_sqr(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
404 int ec_GFp_simple_field_inv(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
406 int ec_GFp_simple_blind_coordinates(const EC_GROUP *group, EC_POINT *p,
408 int ec_GFp_simple_ladder_pre(const EC_GROUP *group,
409 EC_POINT *r, EC_POINT *s,
410 EC_POINT *p, BN_CTX *ctx);
411 int ec_GFp_simple_ladder_step(const EC_GROUP *group,
412 EC_POINT *r, EC_POINT *s,
413 EC_POINT *p, BN_CTX *ctx);
414 int ec_GFp_simple_ladder_post(const EC_GROUP *group,
415 EC_POINT *r, EC_POINT *s,
416 EC_POINT *p, BN_CTX *ctx);
418 /* method functions in ecp_mont.c */
419 int ec_GFp_mont_group_init(EC_GROUP *);
420 int ec_GFp_mont_group_set_curve(EC_GROUP *, const BIGNUM *p, const BIGNUM *a,
421 const BIGNUM *b, BN_CTX *);
422 void ec_GFp_mont_group_finish(EC_GROUP *);
423 void ec_GFp_mont_group_clear_finish(EC_GROUP *);
424 int ec_GFp_mont_group_copy(EC_GROUP *, const EC_GROUP *);
425 int ec_GFp_mont_field_mul(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
426 const BIGNUM *b, BN_CTX *);
427 int ec_GFp_mont_field_sqr(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
429 int ec_GFp_mont_field_inv(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
431 int ec_GFp_mont_field_encode(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
433 int ec_GFp_mont_field_decode(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
435 int ec_GFp_mont_field_set_to_one(const EC_GROUP *, BIGNUM *r, BN_CTX *);
437 /* method functions in ecp_nist.c */
438 int ec_GFp_nist_group_copy(EC_GROUP *dest, const EC_GROUP *src);
439 int ec_GFp_nist_group_set_curve(EC_GROUP *, const BIGNUM *p, const BIGNUM *a,
440 const BIGNUM *b, BN_CTX *);
441 int ec_GFp_nist_field_mul(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
442 const BIGNUM *b, BN_CTX *);
443 int ec_GFp_nist_field_sqr(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
446 /* method functions in ec2_smpl.c */
447 int ec_GF2m_simple_group_init(EC_GROUP *);
448 void ec_GF2m_simple_group_finish(EC_GROUP *);
449 void ec_GF2m_simple_group_clear_finish(EC_GROUP *);
450 int ec_GF2m_simple_group_copy(EC_GROUP *, const EC_GROUP *);
451 int ec_GF2m_simple_group_set_curve(EC_GROUP *, const BIGNUM *p,
452 const BIGNUM *a, const BIGNUM *b,
454 int ec_GF2m_simple_group_get_curve(const EC_GROUP *, BIGNUM *p, BIGNUM *a,
455 BIGNUM *b, BN_CTX *);
456 int ec_GF2m_simple_group_get_degree(const EC_GROUP *);
457 int ec_GF2m_simple_group_check_discriminant(const EC_GROUP *, BN_CTX *);
458 int ec_GF2m_simple_point_init(EC_POINT *);
459 void ec_GF2m_simple_point_finish(EC_POINT *);
460 void ec_GF2m_simple_point_clear_finish(EC_POINT *);
461 int ec_GF2m_simple_point_copy(EC_POINT *, const EC_POINT *);
462 int ec_GF2m_simple_point_set_to_infinity(const EC_GROUP *, EC_POINT *);
463 int ec_GF2m_simple_point_set_affine_coordinates(const EC_GROUP *, EC_POINT *,
465 const BIGNUM *y, BN_CTX *);
466 int ec_GF2m_simple_point_get_affine_coordinates(const EC_GROUP *,
467 const EC_POINT *, BIGNUM *x,
468 BIGNUM *y, BN_CTX *);
469 int ec_GF2m_simple_set_compressed_coordinates(const EC_GROUP *, EC_POINT *,
470 const BIGNUM *x, int y_bit,
472 size_t ec_GF2m_simple_point2oct(const EC_GROUP *, const EC_POINT *,
473 point_conversion_form_t form,
474 unsigned char *buf, size_t len, BN_CTX *);
475 int ec_GF2m_simple_oct2point(const EC_GROUP *, EC_POINT *,
476 const unsigned char *buf, size_t len, BN_CTX *);
477 int ec_GF2m_simple_add(const EC_GROUP *, EC_POINT *r, const EC_POINT *a,
478 const EC_POINT *b, BN_CTX *);
479 int ec_GF2m_simple_dbl(const EC_GROUP *, EC_POINT *r, const EC_POINT *a,
481 int ec_GF2m_simple_invert(const EC_GROUP *, EC_POINT *, BN_CTX *);
482 int ec_GF2m_simple_is_at_infinity(const EC_GROUP *, const EC_POINT *);
483 int ec_GF2m_simple_is_on_curve(const EC_GROUP *, const EC_POINT *, BN_CTX *);
484 int ec_GF2m_simple_cmp(const EC_GROUP *, const EC_POINT *a, const EC_POINT *b,
486 int ec_GF2m_simple_make_affine(const EC_GROUP *, EC_POINT *, BN_CTX *);
487 int ec_GF2m_simple_points_make_affine(const EC_GROUP *, size_t num,
488 EC_POINT *[], BN_CTX *);
489 int ec_GF2m_simple_field_mul(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
490 const BIGNUM *b, BN_CTX *);
491 int ec_GF2m_simple_field_sqr(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
493 int ec_GF2m_simple_field_div(const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
494 const BIGNUM *b, BN_CTX *);
496 #ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
497 /* method functions in ecp_nistp224.c */
498 int ec_GFp_nistp224_group_init(EC_GROUP *group);
499 int ec_GFp_nistp224_group_set_curve(EC_GROUP *group, const BIGNUM *p,
500 const BIGNUM *a, const BIGNUM *n,
502 int ec_GFp_nistp224_point_get_affine_coordinates(const EC_GROUP *group,
503 const EC_POINT *point,
504 BIGNUM *x, BIGNUM *y,
506 int ec_GFp_nistp224_mul(const EC_GROUP *group, EC_POINT *r,
507 const BIGNUM *scalar, size_t num,
508 const EC_POINT *points[], const BIGNUM *scalars[],
510 int ec_GFp_nistp224_points_mul(const EC_GROUP *group, EC_POINT *r,
511 const BIGNUM *scalar, size_t num,
512 const EC_POINT *points[],
513 const BIGNUM *scalars[], BN_CTX *ctx);
514 int ec_GFp_nistp224_precompute_mult(EC_GROUP *group, BN_CTX *ctx);
515 int ec_GFp_nistp224_have_precompute_mult(const EC_GROUP *group);
517 /* method functions in ecp_nistp256.c */
518 int ec_GFp_nistp256_group_init(EC_GROUP *group);
519 int ec_GFp_nistp256_group_set_curve(EC_GROUP *group, const BIGNUM *p,
520 const BIGNUM *a, const BIGNUM *n,
522 int ec_GFp_nistp256_point_get_affine_coordinates(const EC_GROUP *group,
523 const EC_POINT *point,
524 BIGNUM *x, BIGNUM *y,
526 int ec_GFp_nistp256_mul(const EC_GROUP *group, EC_POINT *r,
527 const BIGNUM *scalar, size_t num,
528 const EC_POINT *points[], const BIGNUM *scalars[],
530 int ec_GFp_nistp256_points_mul(const EC_GROUP *group, EC_POINT *r,
531 const BIGNUM *scalar, size_t num,
532 const EC_POINT *points[],
533 const BIGNUM *scalars[], BN_CTX *ctx);
534 int ec_GFp_nistp256_precompute_mult(EC_GROUP *group, BN_CTX *ctx);
535 int ec_GFp_nistp256_have_precompute_mult(const EC_GROUP *group);
537 /* method functions in ecp_nistp521.c */
538 int ec_GFp_nistp521_group_init(EC_GROUP *group);
539 int ec_GFp_nistp521_group_set_curve(EC_GROUP *group, const BIGNUM *p,
540 const BIGNUM *a, const BIGNUM *n,
542 int ec_GFp_nistp521_point_get_affine_coordinates(const EC_GROUP *group,
543 const EC_POINT *point,
544 BIGNUM *x, BIGNUM *y,
546 int ec_GFp_nistp521_mul(const EC_GROUP *group, EC_POINT *r,
547 const BIGNUM *scalar, size_t num,
548 const EC_POINT *points[], const BIGNUM *scalars[],
550 int ec_GFp_nistp521_points_mul(const EC_GROUP *group, EC_POINT *r,
551 const BIGNUM *scalar, size_t num,
552 const EC_POINT *points[],
553 const BIGNUM *scalars[], BN_CTX *ctx);
554 int ec_GFp_nistp521_precompute_mult(EC_GROUP *group, BN_CTX *ctx);
555 int ec_GFp_nistp521_have_precompute_mult(const EC_GROUP *group);
557 /* utility functions in ecp_nistputil.c */
558 void ec_GFp_nistp_points_make_affine_internal(size_t num, void *point_array,
561 void (*felem_one) (void *out),
562 int (*felem_is_zero) (const void
564 void (*felem_assign) (void *out,
567 void (*felem_square) (void *out,
570 void (*felem_mul) (void *out,
575 void (*felem_inv) (void *out,
578 void (*felem_contract) (void
583 void ec_GFp_nistp_recode_scalar_bits(unsigned char *sign,
584 unsigned char *digit, unsigned char in);
586 int ec_group_simple_order_bits(const EC_GROUP *group);
588 #ifdef ECP_NISTZ256_ASM
589 /** Returns GFp methods using montgomery multiplication, with x86-64 optimized
590 * P256. See http://eprint.iacr.org/2013/816.
591 * \return EC_METHOD object
593 const EC_METHOD *EC_GFp_nistz256_method(void);
596 const EC_METHOD *EC_GFp_s390x_nistp256_method(void);
597 const EC_METHOD *EC_GFp_s390x_nistp384_method(void);
598 const EC_METHOD *EC_GFp_s390x_nistp521_method(void);
601 size_t ec_key_simple_priv2oct(const EC_KEY *eckey,
602 unsigned char *buf, size_t len);
603 int ec_key_simple_oct2priv(EC_KEY *eckey, const unsigned char *buf, size_t len);
604 int ec_key_simple_generate_key(EC_KEY *eckey);
605 int ec_key_simple_generate_public_key(EC_KEY *eckey);
606 int ec_key_simple_check_key(const EC_KEY *eckey);
608 int ec_curve_nid_from_params(const EC_GROUP *group, BN_CTX *ctx);
610 /* EC_METHOD definitions */
612 struct ec_key_method_st {
615 int (*init)(EC_KEY *key);
616 void (*finish)(EC_KEY *key);
617 int (*copy)(EC_KEY *dest, const EC_KEY *src);
618 int (*set_group)(EC_KEY *key, const EC_GROUP *grp);
619 int (*set_private)(EC_KEY *key, const BIGNUM *priv_key);
620 int (*set_public)(EC_KEY *key, const EC_POINT *pub_key);
621 int (*keygen)(EC_KEY *key);
622 int (*compute_key)(unsigned char **pout, size_t *poutlen,
623 const EC_POINT *pub_key, const EC_KEY *ecdh);
624 int (*sign)(int type, const unsigned char *dgst, int dlen, unsigned char
625 *sig, unsigned int *siglen, const BIGNUM *kinv,
626 const BIGNUM *r, EC_KEY *eckey);
627 int (*sign_setup)(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp,
629 ECDSA_SIG *(*sign_sig)(const unsigned char *dgst, int dgst_len,
630 const BIGNUM *in_kinv, const BIGNUM *in_r,
633 int (*verify)(int type, const unsigned char *dgst, int dgst_len,
634 const unsigned char *sigbuf, int sig_len, EC_KEY *eckey);
635 int (*verify_sig)(const unsigned char *dgst, int dgst_len,
636 const ECDSA_SIG *sig, EC_KEY *eckey);
639 #define EC_KEY_METHOD_DYNAMIC 1
641 EC_KEY *ec_key_new_method_int(OPENSSL_CTX *libctx, ENGINE *engine);
643 int ossl_ec_key_gen(EC_KEY *eckey);
644 int ossl_ecdh_compute_key(unsigned char **pout, size_t *poutlen,
645 const EC_POINT *pub_key, const EC_KEY *ecdh);
646 int ecdh_simple_compute_key(unsigned char **pout, size_t *poutlen,
647 const EC_POINT *pub_key, const EC_KEY *ecdh);
649 struct ECDSA_SIG_st {
654 int ossl_ecdsa_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp,
656 int ossl_ecdsa_sign(int type, const unsigned char *dgst, int dlen,
657 unsigned char *sig, unsigned int *siglen,
658 const BIGNUM *kinv, const BIGNUM *r, EC_KEY *eckey);
659 ECDSA_SIG *ossl_ecdsa_sign_sig(const unsigned char *dgst, int dgst_len,
660 const BIGNUM *in_kinv, const BIGNUM *in_r,
662 int ossl_ecdsa_verify(int type, const unsigned char *dgst, int dgst_len,
663 const unsigned char *sigbuf, int sig_len, EC_KEY *eckey);
664 int ossl_ecdsa_verify_sig(const unsigned char *dgst, int dgst_len,
665 const ECDSA_SIG *sig, EC_KEY *eckey);
666 int ecdsa_simple_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp,
668 ECDSA_SIG *ecdsa_simple_sign_sig(const unsigned char *dgst, int dgst_len,
669 const BIGNUM *in_kinv, const BIGNUM *in_r,
671 int ecdsa_simple_verify_sig(const unsigned char *dgst, int dgst_len,
672 const ECDSA_SIG *sig, EC_KEY *eckey);
676 * This functions computes a single point multiplication over the EC group,
677 * using, at a high level, a Montgomery ladder with conditional swaps, with
678 * various timing attack defenses.
680 * It performs either a fixed point multiplication
681 * (scalar * generator)
682 * when point is NULL, or a variable point multiplication
684 * when point is not NULL.
686 * `scalar` cannot be NULL and should be in the range [0,n) otherwise all
687 * constant time bets are off (where n is the cardinality of the EC group).
689 * This function expects `group->order` and `group->cardinality` to be well
690 * defined and non-zero: it fails with an error code otherwise.
692 * NB: This says nothing about the constant-timeness of the ladder step
693 * implementation (i.e., the default implementation is based on EC_POINT_add and
694 * EC_POINT_dbl, which of course are not constant time themselves) or the
695 * underlying multiprecision arithmetic.
697 * The product is stored in `r`.
699 * This is an internal function: callers are in charge of ensuring that the
700 * input parameters `group`, `r`, `scalar` and `ctx` are not NULL.
702 * Returns 1 on success, 0 otherwise.
704 int ec_scalar_mul_ladder(const EC_GROUP *group, EC_POINT *r,
705 const BIGNUM *scalar, const EC_POINT *point,
708 int ec_point_blind_coordinates(const EC_GROUP *group, EC_POINT *p, BN_CTX *ctx);
710 static ossl_inline int ec_point_ladder_pre(const EC_GROUP *group,
711 EC_POINT *r, EC_POINT *s,
712 EC_POINT *p, BN_CTX *ctx)
714 if (group->meth->ladder_pre != NULL)
715 return group->meth->ladder_pre(group, r, s, p, ctx);
717 if (!EC_POINT_copy(s, p)
718 || !EC_POINT_dbl(group, r, s, ctx))
724 static ossl_inline int ec_point_ladder_step(const EC_GROUP *group,
725 EC_POINT *r, EC_POINT *s,
726 EC_POINT *p, BN_CTX *ctx)
728 if (group->meth->ladder_step != NULL)
729 return group->meth->ladder_step(group, r, s, p, ctx);
731 if (!EC_POINT_add(group, s, r, s, ctx)
732 || !EC_POINT_dbl(group, r, r, ctx))
739 static ossl_inline int ec_point_ladder_post(const EC_GROUP *group,
740 EC_POINT *r, EC_POINT *s,
741 EC_POINT *p, BN_CTX *ctx)
743 if (group->meth->ladder_post != NULL)
744 return group->meth->ladder_post(group, r, s, p, ctx);