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LibCrypto: Add curve x25519

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stelar7 2022-02-13 01:01:31 +01:00 • committed by Idan Horowitz
parent 5a94402b60
commit 4daa5622fe
5 changed files with 455 additions and 0 deletions
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40
Userland/Libraries/LibCrypto/Curves/X25519.h Normal file
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/*
* Copyright (c) 2022, stelar7 <dudedbz@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/ByteBuffer.h>
namespace Crypto::Curves {
class X25519 {
static constexpr u8 BITS = 255;
static constexpr u8 BYTES = 32;
static constexpr u8 WORDS = 8;
static constexpr u32 A24 = 121666;
public:
static ErrorOr<ByteBuffer> compute_coordinate(ReadonlyBytes a, ReadonlyBytes b);
private:
static void import_state(u32* state, ReadonlyBytes data);
static ErrorOr<ByteBuffer> export_state(u32* data);
static void select(u32* state, u32* a, u32* b, u32 condition);
static void set(u32* state, u32 value);
static void copy(u32* state, u32* value);
static void conditional_swap(u32* first, u32* second, u32 condition);
static void modular_multiply_single(u32* state, u32* first, u32 second);
static void modular_square(u32* state, u32* value);
static void modular_multiply(u32* state, u32* first, u32* second);
static void modular_add(u32* state, u32* first, u32* second);
static void modular_subtract(u32* state, u32* first, u32* second);
static void modular_reduce(u32* state, u32* data);
static void to_power_of_2n(u32* state, u32* value, u8 n);
static void modular_multiply_inverse(u32* state, u32* value);
};
}