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116 lines
3.4 KiB
C
116 lines
3.4 KiB
C
10 years ago
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/* ge_operations.h
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*
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* Copyright (C) 2006-2015 wolfSSL Inc.
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*
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* This file is part of wolfSSL. (formerly known as CyaSSL)
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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 02110-1301, USA
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*/
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/* Based On Daniel J Bernstein's ed25519 Public Domain ref10 work. */
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#ifndef WOLF_CRYPT_GE_OPERATIONS_H
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#define WOLF_CRYPT_GE_OPERATIONS_H
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#include <wolfssl/wolfcrypt/settings.h>
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#ifdef HAVE_ED25519
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#ifndef CURVED25519_SMALL
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#include <stdint.h>
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#endif
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#include <wolfssl/wolfcrypt/fe_operations.h>
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/*
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ge 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 = -121665/121666.
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Representations:
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ge_p2 (projective): (X:Y:Z) satisfying x=X/Z, y=Y/Z
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ge_p3 (extended): (X:Y:Z:T) satisfying x=X/Z, y=Y/Z, XY=ZT
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ge_p1p1 (completed): ((X:Z),(Y:T)) satisfying x=X/Z, y=Y/T
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ge_precomp (Duif): (y+x,y-x,2dxy)
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*/
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typedef struct {
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fe X;
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fe Y;
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fe Z;
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} ge_p2;
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typedef struct {
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fe X;
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fe Y;
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fe Z;
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fe T;
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} ge_p3;
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WOLFSSL_LOCAL int ge_compress_key(byte* out, const byte* xIn, const byte* yIn,
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word32 keySz);
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WOLFSSL_LOCAL int ge_frombytes_negate_vartime(ge_p3 *,const unsigned char *);
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WOLFSSL_LOCAL int ge_double_scalarmult_vartime(ge_p2 *,const unsigned char *,
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const ge_p3 *,const unsigned char *);
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WOLFSSL_LOCAL void ge_scalarmult_base(ge_p3 *,const unsigned char *);
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WOLFSSL_LOCAL void sc_reduce(byte* s);
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WOLFSSL_LOCAL void sc_muladd(byte* s, const byte* a, const byte* b,
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const byte* c);
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WOLFSSL_LOCAL void ge_tobytes(unsigned char *,const ge_p2 *);
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WOLFSSL_LOCAL void ge_p3_tobytes(unsigned char *,const ge_p3 *);
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#ifndef CURVED25519_SMALL
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typedef struct {
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fe X;
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fe Y;
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fe Z;
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fe T;
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} ge_p1p1;
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typedef struct {
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fe yplusx;
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fe yminusx;
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fe xy2d;
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} ge_precomp;
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typedef struct {
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fe YplusX;
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fe YminusX;
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fe Z;
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fe T2d;
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} ge_cached;
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WOLFSSL_LOCAL void ge_p2_0(ge_p2 *);
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WOLFSSL_LOCAL void ge_p3_0(ge_p3 *);
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WOLFSSL_LOCAL void ge_precomp_0(ge_precomp *);
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WOLFSSL_LOCAL void ge_p3_to_p2(ge_p2 *,const ge_p3 *);
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WOLFSSL_LOCAL void ge_p3_to_cached(ge_cached *,const ge_p3 *);
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WOLFSSL_LOCAL void ge_p1p1_to_p2(ge_p2 *,const ge_p1p1 *);
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WOLFSSL_LOCAL void ge_p1p1_to_p3(ge_p3 *,const ge_p1p1 *);
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WOLFSSL_LOCAL void ge_p2_dbl(ge_p1p1 *,const ge_p2 *);
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WOLFSSL_LOCAL void ge_p3_dbl(ge_p1p1 *,const ge_p3 *);
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WOLFSSL_LOCAL void ge_madd(ge_p1p1 *,const ge_p3 *,const ge_precomp *);
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WOLFSSL_LOCAL void ge_msub(ge_p1p1 *,const ge_p3 *,const ge_precomp *);
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WOLFSSL_LOCAL void ge_add(ge_p1p1 *,const ge_p3 *,const ge_cached *);
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WOLFSSL_LOCAL void ge_sub(ge_p1p1 *,const ge_p3 *,const ge_cached *);
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#endif /* no CURVED25519_SMALL */
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#endif /* HAVE_ED25519 */
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#endif /* WOLF_CRYPT_GE_OPERATIONS_H */
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