Line data Source code
1 : /* ecc-common.h - Declarations of common ECC code
2 : * Copyright (C) 2013 g10 Code GmbH
3 : *
4 : * This file is part of Libgcrypt.
5 : *
6 : * Libgcrypt is free software; you can redistribute it and/or modify
7 : * it under the terms of the GNU Lesser General Public License as
8 : * published by the Free Software Foundation; either version 2.1 of
9 : * the License, or (at your option) any later version.
10 : *
11 : * Libgcrypt is distributed in the hope that it will be useful,
12 : * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 : * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 : * GNU Lesser General Public License for more details.
15 : *
16 : * You should have received a copy of the GNU Lesser General Public
17 : * License along with this program; if not, see <http://www.gnu.org/licenses/>.
18 : */
19 :
20 : #ifndef GCRY_ECC_COMMON_H
21 : #define GCRY_ECC_COMMON_H
22 :
23 :
24 : /* Definition of a curve. */
25 : typedef struct
26 : {
27 : enum gcry_mpi_ec_models model;/* The model descrinbing this curve. */
28 : enum ecc_dialects dialect; /* The dialect used with the curve. */
29 : gcry_mpi_t p; /* Prime specifying the field GF(p). */
30 : gcry_mpi_t a; /* First coefficient of the Weierstrass equation. */
31 : gcry_mpi_t b; /* Second coefficient of the Weierstrass equation.
32 : or d as used by Twisted Edwards curves. */
33 : mpi_point_struct G; /* Base point (generator). */
34 : gcry_mpi_t n; /* Order of G. */
35 : gcry_mpi_t h; /* Cofactor. */
36 : const char *name; /* Name of the curve or NULL. */
37 : } elliptic_curve_t;
38 :
39 :
40 : typedef struct
41 : {
42 : elliptic_curve_t E;
43 : mpi_point_struct Q; /* Q = [d]G */
44 : } ECC_public_key;
45 :
46 :
47 : typedef struct
48 : {
49 : elliptic_curve_t E;
50 : mpi_point_struct Q;
51 : gcry_mpi_t d;
52 : } ECC_secret_key;
53 :
54 :
55 :
56 : /* Set the value from S into D. */
57 : static inline void
58 0 : point_set (mpi_point_t d, mpi_point_t s)
59 : {
60 0 : mpi_set (d->x, s->x);
61 0 : mpi_set (d->y, s->y);
62 0 : mpi_set (d->z, s->z);
63 0 : }
64 :
65 : #define point_init(a) _gcry_mpi_point_init ((a))
66 : #define point_free(a) _gcry_mpi_point_free_parts ((a))
67 :
68 :
69 : /*-- ecc-curves.c --*/
70 : gpg_err_code_t _gcry_ecc_fill_in_curve (unsigned int nbits,
71 : const char *name,
72 : elliptic_curve_t *curve,
73 : unsigned int *r_nbits);
74 : gpg_err_code_t _gcry_ecc_update_curve_param (const char *name,
75 : enum gcry_mpi_ec_models *model,
76 : enum ecc_dialects *dialect,
77 : gcry_mpi_t *p, gcry_mpi_t *a,
78 : gcry_mpi_t *b, gcry_mpi_t *g,
79 : gcry_mpi_t *n, gcry_mpi_t *h);
80 :
81 : const char *_gcry_ecc_get_curve (gcry_sexp_t keyparms,
82 : int iterator,
83 : unsigned int *r_nbits);
84 : gcry_sexp_t _gcry_ecc_get_param_sexp (const char *name);
85 :
86 : /*-- ecc-misc.c --*/
87 : void _gcry_ecc_curve_free (elliptic_curve_t *E);
88 : elliptic_curve_t _gcry_ecc_curve_copy (elliptic_curve_t E);
89 : const char *_gcry_ecc_model2str (enum gcry_mpi_ec_models model);
90 : const char *_gcry_ecc_dialect2str (enum ecc_dialects dialect);
91 : gcry_mpi_t _gcry_ecc_ec2os (gcry_mpi_t x, gcry_mpi_t y, gcry_mpi_t p);
92 :
93 : mpi_point_t _gcry_ecc_compute_public (mpi_point_t Q, mpi_ec_t ec,
94 : mpi_point_t G, gcry_mpi_t d);
95 :
96 :
97 : /*-- ecc.c --*/
98 :
99 : /*-- ecc-ecdsa.c --*/
100 : gpg_err_code_t _gcry_ecc_ecdsa_sign (gcry_mpi_t input, ECC_secret_key *skey,
101 : gcry_mpi_t r, gcry_mpi_t s,
102 : int flags, int hashalgo);
103 : gpg_err_code_t _gcry_ecc_ecdsa_verify (gcry_mpi_t input, ECC_public_key *pkey,
104 : gcry_mpi_t r, gcry_mpi_t s);
105 :
106 : /*-- ecc-eddsa.c --*/
107 : gpg_err_code_t _gcry_ecc_eddsa_recover_x (gcry_mpi_t x, gcry_mpi_t y, int sign,
108 : mpi_ec_t ec);
109 : gpg_err_code_t _gcry_ecc_eddsa_encodepoint (mpi_point_t point, mpi_ec_t ctx,
110 : gcry_mpi_t x, gcry_mpi_t y,
111 : int with_prefix,
112 : unsigned char **r_buffer,
113 : unsigned int *r_buflen);
114 : gpg_err_code_t _gcry_ecc_eddsa_ensure_compact (gcry_mpi_t value,
115 : unsigned int nbits);
116 :
117 :
118 : gpg_err_code_t _gcry_ecc_eddsa_compute_h_d (unsigned char **r_digest,
119 : gcry_mpi_t d, mpi_ec_t ec);
120 :
121 : gpg_err_code_t _gcry_ecc_eddsa_genkey (ECC_secret_key *sk,
122 : elliptic_curve_t *E,
123 : mpi_ec_t ctx,
124 : int flags);
125 : gpg_err_code_t _gcry_ecc_eddsa_sign (gcry_mpi_t input,
126 : ECC_secret_key *sk,
127 : gcry_mpi_t r_r, gcry_mpi_t s,
128 : int hashalgo, gcry_mpi_t pk);
129 : gpg_err_code_t _gcry_ecc_eddsa_verify (gcry_mpi_t input,
130 : ECC_public_key *pk,
131 : gcry_mpi_t r, gcry_mpi_t s,
132 : int hashalgo, gcry_mpi_t pkmpi);
133 :
134 : /*-- ecc-gost.c --*/
135 : gpg_err_code_t _gcry_ecc_gost_sign (gcry_mpi_t input, ECC_secret_key *skey,
136 : gcry_mpi_t r, gcry_mpi_t s);
137 : gpg_err_code_t _gcry_ecc_gost_verify (gcry_mpi_t input, ECC_public_key *pkey,
138 : gcry_mpi_t r, gcry_mpi_t s);
139 :
140 :
141 : #endif /*GCRY_ECC_COMMON_H*/
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