My Project
Loading...
Searching...
No Matches
fe_operations.h
1/* fe_operations.h
2 *
3 * Copyright (C) 2006-2020 wolfSSL Inc.
4 *
5 * This file is part of wolfSSL.
6 *
7 * wolfSSL is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * wolfSSL is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
20 */
21
22
23#ifndef WOLF_CRYPT_FE_OPERATIONS_H
24#define WOLF_CRYPT_FE_OPERATIONS_H
25
26#include <wolfssl/wolfcrypt/settings.h>
27
28#if defined(HAVE_CURVE25519) || defined(HAVE_ED25519)
29
30#if !defined(CURVE25519_SMALL) || !defined(ED25519_SMALL)
31 #include <stdint.h>
32#endif
33
34#include <wolfssl/wolfcrypt/types.h>
35
36#if defined(USE_INTEL_SPEEDUP) && !defined(NO_CURVED25519_X64)
37 #define CURVED25519_X64
38#elif defined(HAVE___UINT128_T) && !defined(NO_CURVED25519_128BIT)
39 #define CURVED25519_128BIT
40#endif
41
42#if defined(CURVED25519_X64)
43 #define CURVED25519_ASM_64BIT
44 #define CURVED25519_ASM
45#endif
46#if defined(WOLFSSL_ARMASM)
47 #ifdef __aarch64__
48 #define CURVED25519_ASM_64BIT
49 #else
50 #define CURVED25519_ASM_32BIT
51 #endif
52 #define CURVED25519_ASM
53#endif
54
55/*
56fe means field element.
57Here the field is \Z/(2^255-19).
58An element t, entries t[0]...t[9], represents the integer
59t[0]+2^26 t[1]+2^51 t[2]+2^77 t[3]+2^102 t[4]+...+2^230 t[9].
60Bounds on each t[i] vary depending on context.
61*/
62
63#ifdef __cplusplus
64 extern "C" {
65#endif
66
67#if defined(CURVE25519_SMALL) || defined(ED25519_SMALL)
68 #define F25519_SIZE 32
69
70 WOLFSSL_LOCAL void lm_copy(byte*, const byte*);
71 WOLFSSL_LOCAL void lm_add(byte*, const byte*, const byte*);
72 WOLFSSL_LOCAL void lm_sub(byte*, const byte*, const byte*);
73 WOLFSSL_LOCAL void lm_neg(byte*,const byte*);
74 WOLFSSL_LOCAL void lm_invert(byte*, const byte*);
75 WOLFSSL_LOCAL void lm_mul(byte*,const byte*,const byte*);
76#endif
77
78
79#if !defined(FREESCALE_LTC_ECC)
80WOLFSSL_LOCAL void fe_init(void);
81
82WOLFSSL_LOCAL int curve25519(byte * q, byte * n, byte * p);
83#endif
84
85/* default to be faster but take more memory */
86#if !defined(CURVE25519_SMALL) || !defined(ED25519_SMALL)
87
88#ifdef CURVED25519_ASM_64BIT
89 typedef int64_t fe[4];
90#elif defined(CURVED25519_ASM_32BIT)
91 typedef int32_t fe[8];
92#elif defined(CURVED25519_128BIT)
93 typedef int64_t fe[5];
94#else
95 typedef int32_t fe[10];
96#endif
97
98WOLFSSL_LOCAL void fe_copy(fe, const fe);
99WOLFSSL_LOCAL void fe_add(fe, const fe, const fe);
100WOLFSSL_LOCAL void fe_neg(fe,const fe);
101WOLFSSL_LOCAL void fe_sub(fe, const fe, const fe);
102WOLFSSL_LOCAL void fe_invert(fe, const fe);
103WOLFSSL_LOCAL void fe_mul(fe,const fe,const fe);
104
105
106/* Based On Daniel J Bernstein's curve25519 and ed25519 Public Domain ref10
107 work. */
108
109WOLFSSL_LOCAL void fe_0(fe);
110WOLFSSL_LOCAL void fe_1(fe);
111WOLFSSL_LOCAL int fe_isnonzero(const fe);
112WOLFSSL_LOCAL int fe_isnegative(const fe);
113WOLFSSL_LOCAL void fe_tobytes(unsigned char *, const fe);
114WOLFSSL_LOCAL void fe_sq(fe, const fe);
115WOLFSSL_LOCAL void fe_sq2(fe,const fe);
116WOLFSSL_LOCAL void fe_frombytes(fe,const unsigned char *);
117WOLFSSL_LOCAL void fe_cswap(fe, fe, int);
118WOLFSSL_LOCAL void fe_mul121666(fe,fe);
119WOLFSSL_LOCAL void fe_cmov(fe,const fe, int);
120WOLFSSL_LOCAL void fe_pow22523(fe,const fe);
121
122/* 64 type needed for SHA512 */
123WOLFSSL_LOCAL uint64_t load_3(const unsigned char *in);
124WOLFSSL_LOCAL uint64_t load_4(const unsigned char *in);
125
126#ifdef CURVED25519_ASM
127WOLFSSL_LOCAL void fe_ge_to_p2(fe rx, fe ry, fe rz, const fe px, const fe py,
128 const fe pz, const fe pt);
129WOLFSSL_LOCAL void fe_ge_to_p3(fe rx, fe ry, fe rz, fe rt, const fe px,
130 const fe py, const fe pz, const fe pt);
131WOLFSSL_LOCAL void fe_ge_dbl(fe rx, fe ry, fe rz, fe rt, const fe px,
132 const fe py, const fe pz);
133WOLFSSL_LOCAL void fe_ge_madd(fe rx, fe ry, fe rz, fe rt, const fe px,
134 const fe py, const fe pz, const fe pt,
135 const fe qxy2d, const fe qyplusx,
136 const fe qyminusx);
137WOLFSSL_LOCAL void fe_ge_msub(fe rx, fe ry, fe rz, fe rt, const fe px,
138 const fe py, const fe pz, const fe pt,
139 const fe qxy2d, const fe qyplusx,
140 const fe qyminusx);
141WOLFSSL_LOCAL void fe_ge_add(fe rx, fe ry, fe rz, fe rt, const fe px,
142 const fe py, const fe pz, const fe pt, const fe qz,
143 const fe qt2d, const fe qyplusx,
144 const fe qyminusx);
145WOLFSSL_LOCAL void fe_ge_sub(fe rx, fe ry, fe rz, fe rt, const fe px,
146 const fe py, const fe pz, const fe pt, const fe qz,
147 const fe qt2d, const fe qyplusx,
148 const fe qyminusx);
149WOLFSSL_LOCAL void fe_cmov_table(fe* r, fe* base, signed char b);
150#endif /* CURVED25519_ASM */
151#endif /* !CURVE25519_SMALL || !ED25519_SMALL */
152
153/* Use less memory and only 32bit types or less, but is slower
154 Based on Daniel Beer's public domain work. */
155#if defined(CURVE25519_SMALL) || defined(ED25519_SMALL)
156static const byte c25519_base_x[F25519_SIZE] = {9};
157static const byte f25519_zero[F25519_SIZE] = {0};
158static const byte f25519_one[F25519_SIZE] = {1};
159static const byte fprime_zero[F25519_SIZE] = {0};
160static const byte fprime_one[F25519_SIZE] = {1};
161
162WOLFSSL_LOCAL void fe_load(byte *x, word32 c);
163WOLFSSL_LOCAL void fe_normalize(byte *x);
164WOLFSSL_LOCAL void fe_inv__distinct(byte *r, const byte *x);
165
166/* Conditional copy. If condition == 0, then zero is copied to dst. If
167 * condition == 1, then one is copied to dst. Any other value results in
168 * undefined behavior.
169 */
170WOLFSSL_LOCAL void fe_select(byte *dst, const byte *zero, const byte *one,
171 byte condition);
172
173/* Multiply a point by a small constant. The two pointers are not
174 * required to be distinct.
175 *
176 * The constant must be less than 2^24.
177 */
178WOLFSSL_LOCAL void fe_mul_c(byte *r, const byte *a, word32 b);
179WOLFSSL_LOCAL void fe_mul__distinct(byte *r, const byte *a, const byte *b);
180
181/* Compute one of the square roots of the field element, if the element
182 * is square. The other square is -r.
183 *
184 * If the input is not square, the returned value is a valid field
185 * element, but not the correct answer. If you don't already know that
186 * your element is square, you should square the return value and test.
187 */
188WOLFSSL_LOCAL void fe_sqrt(byte *r, const byte *x);
189
190/* Conditional copy. If condition == 0, then zero is copied to dst. If
191 * condition == 1, then one is copied to dst. Any other value results in
192 * undefined behavior.
193 */
194WOLFSSL_LOCAL void fprime_select(byte *dst, const byte *zero, const byte *one,
195 byte condition);
196WOLFSSL_LOCAL void fprime_add(byte *r, const byte *a, const byte *modulus);
197WOLFSSL_LOCAL void fprime_sub(byte *r, const byte *a, const byte *modulus);
198WOLFSSL_LOCAL void fprime_mul(byte *r, const byte *a, const byte *b,
199 const byte *modulus);
200WOLFSSL_LOCAL void fprime_copy(byte *x, const byte *a);
201
202#endif /* CURVE25519_SMALL || ED25519_SMALL */
203
204#ifdef __cplusplus
205 } /* extern "C" */
206#endif
207
208#endif /* HAVE_CURVE25519 || HAVE_ED25519 */
209
210#endif /* WOLF_CRYPT_FE_OPERATIONS_H */