mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-22 07:28:10 +00:00
79 lines
3.1 KiB
C
79 lines
3.1 KiB
C
// Copyright (c) 2014-2018, The Monero Project
|
|
//
|
|
// All rights reserved.
|
|
//
|
|
// Redistribution and use in source and binary forms, with or without
|
|
// modification, are permitted provided that the following conditions are met:
|
|
//
|
|
// 1. Redistributions of source code must retain the above copyright notice,
|
|
// this list of conditions and the following disclaimer.
|
|
//
|
|
// 2. 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.
|
|
//
|
|
// 3. Neither the name of the copyright holder 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.
|
|
//
|
|
// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote
|
|
// developers
|
|
|
|
#pragma once
|
|
|
|
#include <assert.h>
|
|
#include <stdint.h>
|
|
|
|
static inline uint64_t hi_dword(uint64_t val) { return val >> 32; }
|
|
|
|
static inline uint64_t lo_dword(uint64_t val) { return val & 0xFFFFFFFF; }
|
|
|
|
static inline uint64_t mul128(uint64_t multiplier, uint64_t multiplicand,
|
|
uint64_t* product_hi) {
|
|
// multiplier = ab = a * 2^32 + b
|
|
// multiplicand = cd = c * 2^32 + d
|
|
// ab * cd = a * c * 2^64 + (a * d + b * c) * 2^32 + b * d
|
|
uint64_t a = hi_dword(multiplier);
|
|
uint64_t b = lo_dword(multiplier);
|
|
uint64_t c = hi_dword(multiplicand);
|
|
uint64_t d = lo_dword(multiplicand);
|
|
|
|
uint64_t ac = a * c;
|
|
uint64_t ad = a * d;
|
|
uint64_t bc = b * c;
|
|
uint64_t bd = b * d;
|
|
|
|
uint64_t adbc = ad + bc;
|
|
uint64_t adbc_carry = adbc < ad ? 1 : 0;
|
|
|
|
// multiplier * multiplicand = product_hi * 2^64 + product_lo
|
|
uint64_t product_lo = bd + (adbc << 32);
|
|
uint64_t product_lo_carry = product_lo < bd ? 1 : 0;
|
|
*product_hi = ac + (adbc >> 32) + (adbc_carry << 32) + product_lo_carry;
|
|
assert(ac <= *product_hi);
|
|
|
|
return product_lo;
|
|
}
|
|
|
|
#define SWAP64(x) \
|
|
((((uint64_t)(x)&0x00000000000000ff) << 56) | \
|
|
(((uint64_t)(x)&0x000000000000ff00) << 40) | \
|
|
(((uint64_t)(x)&0x0000000000ff0000) << 24) | \
|
|
(((uint64_t)(x)&0x00000000ff000000) << 8) | \
|
|
(((uint64_t)(x)&0x000000ff00000000) >> 8) | \
|
|
(((uint64_t)(x)&0x0000ff0000000000) >> 24) | \
|
|
(((uint64_t)(x)&0x00ff000000000000) >> 40) | \
|
|
(((uint64_t)(x)&0xff00000000000000) >> 56))
|