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87 lines
2.5 KiB
C
87 lines
2.5 KiB
C
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/* ge_448.h
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*
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* Copyright (C) 2006-2020 wolfSSL Inc.
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*
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* This file is part of wolfSSL.
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*
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* wolfSSL is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* wolfSSL is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
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*/
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#ifndef WOLF_CRYPT_GE_448_H
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#define WOLF_CRYPT_GE_448_H
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#include <libwolfssl/wolfcrypt/settings.h>
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#ifdef HAVE_ED448
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#include <libwolfssl/wolfcrypt/fe_448.h>
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/*
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ge448 means group element.
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Here the group is the set of pairs (x,y) of field elements (see fe.h)
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satisfying -x^2 + y^2 = 1 + d x^2y^2
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where d = -39081.
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Representations:
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ge448_p2 (projective) : (X:Y:Z) satisfying x=X/Z, y=Y/Z
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ge448_precomp (affine): (x,y)
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*/
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#ifdef ED448_SMALL
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typedef byte ge448;
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#define GE448_WORDS 56
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#elif defined(CURVED448_128BIT)
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typedef int64_t ge448;
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#define GE448_WORDS 8
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#else
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typedef int32_t ge448;
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#define GE448_WORDS 16
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#endif
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typedef struct {
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ge448 X[GE448_WORDS];
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ge448 Y[GE448_WORDS];
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ge448 Z[GE448_WORDS];
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} ge448_p2;
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WOLFSSL_LOCAL int ge448_compress_key(byte*, const byte*, const byte*);
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WOLFSSL_LOCAL int ge448_from_bytes_negate_vartime(ge448_p2 *,
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const unsigned char *);
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WOLFSSL_LOCAL int ge448_double_scalarmult_vartime(ge448_p2 *,
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const unsigned char *,
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const ge448_p2 *,
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const unsigned char *);
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WOLFSSL_LOCAL void ge448_scalarmult_base(ge448_p2 *, const unsigned char *);
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WOLFSSL_LOCAL void sc448_reduce(byte*);
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WOLFSSL_LOCAL void sc448_muladd(byte*, const byte*, const byte*, const byte*);
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WOLFSSL_LOCAL void ge448_to_bytes(unsigned char *, const ge448_p2 *);
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#ifndef ED448_SMALL
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typedef struct {
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ge448 x[GE448_WORDS];
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ge448 y[GE448_WORDS];
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} ge448_precomp;
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#endif /* !ED448_SMALL */
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#endif /* HAVE_ED448 */
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#endif /* WOLF_CRYPT_GE_448_H */
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