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/* ge_operations.h
*
* Copyright (C) 2006-2020 wolfSSL Inc.
*
* This file is part of wolfSSL.
*
* wolfSSL is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* wolfSSL is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
*/
/* Based On Daniel J Bernstein's ed25519 Public Domain ref10 work. */
#ifndef WOLF_CRYPT_GE_OPERATIONS_H
#define WOLF_CRYPT_GE_OPERATIONS_H
#include <wolfssl/wolfcrypt/settings.h>
#ifdef HAVE_ED25519
#include <wolfssl/wolfcrypt/fe_operations.h>
/*
ge means group element.
Here the group is the set of pairs (x,y) of field elements (see fe.h)
satisfying -x^2 + y^2 = 1 + d x^2y^2
where d = -121665/121666.
Representations:
ge_p2 (projective): (X:Y:Z) satisfying x=X/Z, y=Y/Z
ge_p3 (extended): (X:Y:Z:T) satisfying x=X/Z, y=Y/Z, XY=ZT
ge_p1p1 (completed): ((X:Z),(Y:T)) satisfying x=X/Z, y=Y/T
ge_precomp (Duif): (y+x,y-x,2dxy)
*/
#ifdef ED25519_SMALL
typedef byte ge[F25519_SIZE];
#elif defined(CURVED25519_ASM_64BIT)
typedef int64_t ge[4];
#elif defined(CURVED25519_ASM_32BIT)
typedef int32_t ge[8];
#elif defined(CURVED25519_128BIT)
typedef int64_t ge[5];
#else
typedef int32_t ge[10];
#endif
typedef struct {
ge X;
ge Y;
ge Z;
} ge_p2;
typedef struct {
ge X;
ge Y;
ge Z;
ge T;
} ge_p3;
WOLFSSL_LOCAL int ge_compress_key(byte* out, const byte* xIn, const byte* yIn,
word32 keySz);
WOLFSSL_LOCAL int ge_frombytes_negate_vartime(ge_p3 *,const unsigned char *);
WOLFSSL_LOCAL int ge_double_scalarmult_vartime(ge_p2 *,const unsigned char *,
const ge_p3 *,const unsigned char *);
WOLFSSL_LOCAL void ge_scalarmult_base(ge_p3 *,const unsigned char *);
WOLFSSL_LOCAL void sc_reduce(byte* s);
WOLFSSL_LOCAL void sc_muladd(byte* s, const byte* a, const byte* b,
const byte* c);
WOLFSSL_LOCAL void ge_tobytes(unsigned char *,const ge_p2 *);
WOLFSSL_LOCAL void ge_p3_tobytes(unsigned char *,const ge_p3 *);
#ifndef ED25519_SMALL
typedef struct {
ge X;
ge Y;
ge Z;
ge T;
} ge_p1p1;
typedef struct {
ge yplusx;
ge yminusx;
ge xy2d;
} ge_precomp;
typedef struct {
ge YplusX;
ge YminusX;
ge Z;
ge T2d;
} ge_cached;
#endif /* !ED25519_SMALL */
#endif /* HAVE_ED25519 */
#endif /* WOLF_CRYPT_GE_OPERATIONS_H */
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