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ton/tdutils/td/utils/BigNum.h
2019-09-07 14:33:36 +04:00

139 lines
3.6 KiB
C++

/*
This file is part of TON Blockchain Library.
TON Blockchain Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
TON Blockchain Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with TON Blockchain Library. If not, see <http://www.gnu.org/licenses/>.
Copyright 2017-2019 Telegram Systems LLP
*/
#pragma once
#include "td/utils/common.h"
#if TD_HAVE_OPENSSL
#include "td/utils/Slice.h"
#include "td/utils/Status.h"
#include "td/utils/StringBuilder.h"
namespace td {
class BigNumContext {
public:
BigNumContext();
BigNumContext(const BigNumContext &other) = delete;
BigNumContext &operator=(const BigNumContext &other) = delete;
BigNumContext(BigNumContext &&other);
BigNumContext &operator=(BigNumContext &&other);
~BigNumContext();
private:
class Impl;
unique_ptr<Impl> impl_;
friend class BigNum;
};
class BigNum {
public:
BigNum();
BigNum(const BigNum &other);
BigNum &operator=(const BigNum &other);
BigNum(BigNum &&other);
BigNum &operator=(BigNum &&other);
~BigNum();
static BigNum from_binary(Slice str);
// Available only if OpenSSL >= 1.1.0
static BigNum from_le_binary(Slice str);
static Result<BigNum> from_decimal(CSlice str);
static Result<BigNum> from_hex(CSlice str);
static BigNum from_raw(void *openssl_big_num);
void set_value(uint32 new_value);
void ensure_const_time();
int get_num_bits() const;
int get_num_bytes() const;
void set_bit(int num);
void clear_bit(int num);
bool is_bit_set(int num) const;
bool is_prime(BigNumContext &context) const;
BigNum clone() const;
string to_binary(int exact_size = -1) const;
// Available only if OpenSSL >= 1.1.0
string to_le_binary(int exact_size = -1) const;
string to_decimal() const;
void operator+=(uint32 value);
void operator-=(uint32 value);
void operator*=(uint32 value);
void operator/=(uint32 value);
uint32 operator%(uint32 value) const;
static void random(BigNum &r, int bits, int top, int bottom);
static void add(BigNum &r, const BigNum &a, const BigNum &b);
static void sub(BigNum &r, const BigNum &a, const BigNum &b);
static void mul(BigNum &r, BigNum &a, BigNum &b, BigNumContext &context);
static void mod_add(BigNum &r, BigNum &a, BigNum &b, const BigNum &m, BigNumContext &context);
static void mod_sub(BigNum &r, BigNum &a, BigNum &b, const BigNum &m, BigNumContext &context);
static void mod_mul(BigNum &r, BigNum &a, BigNum &b, const BigNum &m, BigNumContext &context);
static void mod_inverse(BigNum &r, BigNum &a, const BigNum &m, BigNumContext &context);
static void div(BigNum *quotient, BigNum *remainder, const BigNum &dividend, const BigNum &divisor,
BigNumContext &context);
static void mod_exp(BigNum &r, const BigNum &a, const BigNum &p, const BigNum &m, BigNumContext &context);
static void gcd(BigNum &r, BigNum &a, BigNum &b, BigNumContext &context);
static int compare(const BigNum &a, const BigNum &b);
private:
class Impl;
unique_ptr<Impl> impl_;
explicit BigNum(unique_ptr<Impl> &&impl);
};
StringBuilder &operator<<(StringBuilder &sb, const BigNum &bn);
} // namespace td
#endif