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//------------------------------------------------------------------------------
//
// ed25519_fpga_curve.h
// ------------------------------------------------
// Elliptic curve arithmetic procedures for Ed25519
//
// Authors: Pavel Shatov
//
// Copyright (c) 2018 NORDUnet A/S
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// - Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// - Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// - Neither the name of the NORDUnet nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
// Ed25519 Parameters
//------------------------------------------------------------------------------
/* x-coordinate of the base point */
#define ED25519_G_X_INIT {0x216936d3, 0xcd6e53fe, 0xc0a4e231, 0xfdd6dc5c, \
0x692cc760, 0x9525a7b2, 0xc9562d60, 0x8f25d51a}
/* y-coordinate of the base point */
#define ED25519_G_Y_INIT {0x66666666, 0x66666666, 0x66666666, 0x66666666, \
0x66666666, 0x66666666, 0x66666666, 0x66666658}
/* z-coordinate of the base point */
#define ED25519_G_Z_INIT {0x00000000, 0x00000000, 0x00000000, 0x00000000, \
0x00000000, 0x00000000, 0x00000000, 0x00000001}
/* t-coordinate of the base point */
#define ED25519_G_T_INIT {0x67875f0f, 0xd78b7665, 0x66ea4e8e, 0x64abe37d, \
0x20f09f80, 0x775152f5, 0x6dde8ab3, 0xa5b7dda3}
//------------------------------------------------------------------------------
// Globals
//------------------------------------------------------------------------------
extern FPGA_BUFFER ED25519_G_X; // the base point
extern FPGA_BUFFER ED25519_G_Y; //
extern FPGA_BUFFER ED25519_G_Z; //
extern FPGA_BUFFER ED25519_G_T; //
//------------------------------------------------------------------------------
// Implementation switch
//------------------------------------------------------------------------------
#ifdef USE_MICROCODE
#define fpga_curve_ed25519_base_scalar_multiply fpga_curve_ed25519_base_scalar_multiply_microcode
#else
#define fpga_curve_ed25519_base_scalar_multiply fpga_curve_ed25519_base_scalar_multiply_abstract
#endif
//------------------------------------------------------------------------------
// Prototypes
//------------------------------------------------------------------------------
void fpga_curve_ed25519_init ();
void fpga_curve_ed25519_base_scalar_multiply_abstract (const FPGA_BUFFER *K, FPGA_BUFFER *Q_Y);
void fpga_curve_ed25519_base_scalar_multiply_microcode (const FPGA_BUFFER *K, FPGA_BUFFER *Q_Y);
void fpga_curve_ed25519_double (const FPGA_BUFFER *P_X,
const FPGA_BUFFER *P_Y,
const FPGA_BUFFER *P_Z,
const FPGA_BUFFER *P_T,
FPGA_BUFFER *Q_X,
FPGA_BUFFER *Q_Y,
FPGA_BUFFER *Q_Z,
FPGA_BUFFER *Q_T);
void fpga_curve_ed25519_add (const FPGA_BUFFER *P_X,
const FPGA_BUFFER *P_Y,
const FPGA_BUFFER *P_Z,
const FPGA_BUFFER *P_T,
const FPGA_BUFFER *Q_X,
const FPGA_BUFFER *Q_Y,
const FPGA_BUFFER *Q_Z,
const FPGA_BUFFER *Q_T,
FPGA_BUFFER *R_X,
FPGA_BUFFER *R_Y,
FPGA_BUFFER *R_Z,
FPGA_BUFFER *R_T);
void fpga_curve_ed25519_to_affine (const FPGA_BUFFER *P_X, const FPGA_BUFFER *P_Y,
const FPGA_BUFFER *P_Z,
FPGA_BUFFER *Q_X, FPGA_BUFFER *Q_Y);
//------------------------------------------------------------------------------
// End-of-File
//------------------------------------------------------------------------------
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