mirror of https://github.com/status-im/leopard.git
147 lines
4.7 KiB
C++
147 lines
4.7 KiB
C++
/*
|
|
Copyright (c) 2017 Christopher A. Taylor. All rights reserved.
|
|
|
|
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 Leopard-RS 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.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include "LeopardCommon.h"
|
|
|
|
#ifdef LEO_HAS_FF16
|
|
|
|
/*
|
|
16-bit Finite Field Math
|
|
|
|
This finite field contains 65536 elements and so each element is one byte.
|
|
This library is designed for data that is a multiple of 64 bytes in size.
|
|
*/
|
|
|
|
namespace leopard { namespace ff16 {
|
|
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Datatypes and Constants
|
|
|
|
// Finite field element type
|
|
typedef uint16_t ffe_t;
|
|
|
|
// Number of bits per element
|
|
static const unsigned kBits = 16;
|
|
|
|
// Finite field order: Number of elements in the field
|
|
static const unsigned kOrder = 65536;
|
|
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Fast Walsh-Hadamard Transform (FWHT) (mod kModulus)
|
|
|
|
// Transform for a variable number of bits (up to kOrder)
|
|
void FWHT(ffe_t* data, const unsigned bits);
|
|
|
|
// Transform specialized for the finite field order
|
|
void FWHT(ffe_t data[kOrder]);
|
|
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Multiplies
|
|
|
|
// x[] = y[] * m
|
|
void mul_mem_set(
|
|
void * LEO_RESTRICT x, const void * LEO_RESTRICT y,
|
|
ffe_t m, uint64_t bytes);
|
|
|
|
|
|
//------------------------------------------------------------------------------
|
|
// FFT Operations
|
|
|
|
// x[] ^= y[] * m, y[] ^= x[]
|
|
void fft_butterfly(
|
|
void * LEO_RESTRICT x, void * LEO_RESTRICT y,
|
|
ffe_t m, uint64_t bytes);
|
|
|
|
// For i = {0, 1, 2, 3}: x_i[] ^= y_i[] * m, y_i[] ^= x_i[]
|
|
void fft_butterfly4(
|
|
void * LEO_RESTRICT x_0, void * LEO_RESTRICT y_0,
|
|
void * LEO_RESTRICT x_1, void * LEO_RESTRICT y_1,
|
|
void * LEO_RESTRICT x_2, void * LEO_RESTRICT y_2,
|
|
void * LEO_RESTRICT x_3, void * LEO_RESTRICT y_3,
|
|
ffe_t m, uint64_t bytes);
|
|
|
|
|
|
//------------------------------------------------------------------------------
|
|
// IFFT Operations
|
|
|
|
// y[] ^= x[], x[] ^= y[] * m
|
|
void ifft_butterfly(
|
|
void * LEO_RESTRICT x, void * LEO_RESTRICT y,
|
|
ffe_t m, uint64_t bytes);
|
|
|
|
// For i = {0, 1, 2, 3}: y_i[] ^= x_i[], x_i[] ^= y_i[] * m
|
|
void ifft_butterfly4(
|
|
void * LEO_RESTRICT x_0, void * LEO_RESTRICT y_0,
|
|
void * LEO_RESTRICT x_1, void * LEO_RESTRICT y_1,
|
|
void * LEO_RESTRICT x_2, void * LEO_RESTRICT y_2,
|
|
void * LEO_RESTRICT x_3, void * LEO_RESTRICT y_3,
|
|
ffe_t m, uint64_t bytes);
|
|
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Encode
|
|
|
|
void Encode(
|
|
uint64_t buffer_bytes,
|
|
unsigned original_count,
|
|
unsigned recovery_count,
|
|
unsigned m, // = NextPow2(recovery_count) * 2 = work_count
|
|
void* const * const data,
|
|
void** work); // Size of GetEncodeWorkCount()
|
|
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Decode
|
|
|
|
void Decode(
|
|
uint64_t buffer_bytes,
|
|
unsigned original_count,
|
|
unsigned recovery_count,
|
|
unsigned m, // = NextPow2(recovery_count)
|
|
unsigned n, // = NextPow2(m + original_count) = work_count
|
|
void* const * const original, // original_count entries
|
|
void* const * const recovery, // recovery_count entries
|
|
void** work); // n entries
|
|
|
|
|
|
//------------------------------------------------------------------------------
|
|
// API
|
|
|
|
// Returns false if the self-test fails
|
|
bool Initialize();
|
|
|
|
|
|
}} // namespace leopard::ff16
|
|
|
|
#endif // LEO_HAS_FF16
|