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/* ge_448.h
*
* Copyright (C) 2006-2026 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 3 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
*/
#ifndef WOLF_CRYPT_GE_448_H
#define WOLF_CRYPT_GE_448_H
#include <wolfssl/wolfcrypt/settings.h>
#ifdef HAVE_ED448
#include <wolfssl/wolfcrypt/fe_448.h>
/*
ge448 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 = -39081.
Representations:
ge448_p2 (projective) : (X:Y:Z) satisfying x=X/Z, y=Y/Z
ge448_precomp (affine): (x,y)
*/
#ifdef ED448_SMALL
typedef byte ge448;
#define GE448_WORDS 56
#elif defined(CURVED448_128BIT)
typedef sword64 ge448;
#define GE448_WORDS 8
#else
typedef sword32 ge448;
#define GE448_WORDS 16
#endif
typedef struct {
ge448 X[GE448_WORDS];
ge448 Y[GE448_WORDS];
ge448 Z[GE448_WORDS];
} ge448_p2;
WOLFSSL_LOCAL int ge448_compress_key(byte* out, const byte* xIn, const byte* yIn);
WOLFSSL_LOCAL int ge448_from_bytes_negate_vartime(ge448_p2 *r, const byte *b);
WOLFSSL_LOCAL int ge448_double_scalarmult_vartime(ge448_p2 *r, const byte *a,
const ge448_p2 *A, const byte *b);
WOLFSSL_LOCAL int ge448_scalarmult_base(ge448_p2* h, const byte* a);
/* Only performs a weak reduce. */
WOLFSSL_LOCAL void sc448_reduce(byte* b);
WOLFSSL_LOCAL void sc448_muladd(byte* r, const byte* a, const byte* b, const byte* d);
WOLFSSL_LOCAL void ge448_to_bytes(byte *s, const ge448_p2 *h);
#ifndef ED448_SMALL
typedef struct {
ge448 x[GE448_WORDS];
ge448 y[GE448_WORDS];
} ge448_precomp;
#endif /* !ED448_SMALL */
#endif /* HAVE_ED448 */
#endif /* WOLF_CRYPT_GE_448_H */