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/*
* ISC License
*
* Copyright (c) 2013-2019
* Frank Denis <j at pureftpd dot org>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef ed25519_ref10_H
#define ed25519_ref10_H
#include <roken.h>
#include <stddef.h>
#include <stdint.h>
/*
fe means field element.
Here the field is \Z/(2^255-19).
*/
#ifdef HAVE_TI_MODE
typedef uint64_t fe25519[5];
#else
typedef int32_t fe25519[10];
#endif
void fe25519_invert(fe25519 out, const fe25519 z);
void fe25519_frombytes(fe25519 h, const unsigned char *s);
void fe25519_tobytes(unsigned char *s, const fe25519 h);
static inline int
sodium_is_zero(const unsigned char *n, const size_t nlen)
{
size_t i;
volatile unsigned char d = 0U;
for (i = 0U; i < nlen; i++) {
d |= n[i];
}
return 1 & ((d - 1) >> 8);
}
#ifdef HAVE_TI_MODE
# include "ed25519_ref10_fe_51.h"
#else
# include "ed25519_ref10_fe_25_5.h"
#endif
/*
ge means group element.
Here the group is the set of pairs (x,y) of field elements
satisfying -x^2 + y^2 = 1 + d x^2y^2
where d = -121665/121666.
Representations:
ge25519_p2 (projective): (X:Y:Z) satisfying x=X/Z, y=Y/Z
ge25519_p3 (extended): (X:Y:Z:T) satisfying x=X/Z, y=Y/Z, XY=ZT
ge25519_p1p1 (completed): ((X:Z),(Y:T)) satisfying x=X/Z, y=Y/T
ge25519_precomp (Duif): (y+x,y-x,2dxy)
*/
typedef struct {
fe25519 X;
fe25519 Y;
fe25519 Z;
} ge25519_p2;
typedef struct {
fe25519 X;
fe25519 Y;
fe25519 Z;
fe25519 T;
} ge25519_p3;
typedef struct {
fe25519 X;
fe25519 Y;
fe25519 Z;
fe25519 T;
} ge25519_p1p1;
typedef struct {
fe25519 yplusx;
fe25519 yminusx;
fe25519 xy2d;
} ge25519_precomp;
typedef struct {
fe25519 YplusX;
fe25519 YminusX;
fe25519 Z;
fe25519 T2d;
} ge25519_cached;
void ge25519_tobytes(unsigned char *s, const ge25519_p2 *h);
void ge25519_p3_tobytes(unsigned char *s, const ge25519_p3 *h);
int ge25519_frombytes(ge25519_p3 *h, const unsigned char *s);
int ge25519_frombytes_negate_vartime(ge25519_p3 *h, const unsigned char *s);
void ge25519_p3_to_cached(ge25519_cached *r, const ge25519_p3 *p);
void ge25519_p1p1_to_p2(ge25519_p2 *r, const ge25519_p1p1 *p);
void ge25519_p1p1_to_p3(ge25519_p3 *r, const ge25519_p1p1 *p);
void ge25519_add(ge25519_p1p1 *r, const ge25519_p3 *p, const ge25519_cached *q);
void ge25519_sub(ge25519_p1p1 *r, const ge25519_p3 *p, const ge25519_cached *q);
void ge25519_scalarmult_base(ge25519_p3 *h, const unsigned char *a);
void ge25519_double_scalarmult_vartime(ge25519_p2 *r, const unsigned char *a,
const ge25519_p3 *A,
const unsigned char *b);
void ge25519_scalarmult(ge25519_p3 *h, const unsigned char *a,
const ge25519_p3 *p);
int ge25519_is_canonical(const unsigned char *s);
int ge25519_is_on_curve(const ge25519_p3 *p);
int ge25519_is_on_main_subgroup(const ge25519_p3 *p);
int ge25519_has_small_order(const unsigned char s[32]);
void ge25519_from_uniform(unsigned char s[32], const unsigned char r[32]);
void ge25519_from_hash(unsigned char s[32], const unsigned char h[64]);
/*
Ristretto group
*/
int ristretto255_frombytes(ge25519_p3 *h, const unsigned char *s);
void ristretto255_p3_tobytes(unsigned char *s, const ge25519_p3 *h);
void ristretto255_from_hash(unsigned char s[32], const unsigned char h[64]);
/*
The set of scalars is \Z/l
where l = 2^252 + 27742317777372353535851937790883648493.
*/
void sc25519_invert(unsigned char recip[32], const unsigned char s[32]);
void sc25519_reduce(unsigned char s[64]);
void sc25519_mul(unsigned char s[32], const unsigned char a[32],
const unsigned char b[32]);
void sc25519_muladd(unsigned char s[32], const unsigned char a[32],
const unsigned char b[32], const unsigned char c[32]);
int sc25519_is_canonical(const unsigned char s[32]);
#endif
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