127 lines
3.0 KiB
C++
127 lines
3.0 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#pragma once
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#include "td/utils/common.h"
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#if TD_HAVE_OPENSSL
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#include "td/utils/Slice.h"
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#include "td/utils/Status.h"
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#include "td/utils/StringBuilder.h"
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namespace td {
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class BigNumContext {
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public:
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BigNumContext();
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BigNumContext(const BigNumContext &other) = delete;
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BigNumContext &operator=(const BigNumContext &other) = delete;
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BigNumContext(BigNumContext &&other);
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BigNumContext &operator=(BigNumContext &&other);
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~BigNumContext();
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private:
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class Impl;
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unique_ptr<Impl> impl_;
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friend class BigNum;
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};
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class BigNum {
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public:
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BigNum();
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BigNum(const BigNum &other);
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BigNum &operator=(const BigNum &other);
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BigNum(BigNum &&other);
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BigNum &operator=(BigNum &&other);
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~BigNum();
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static BigNum from_binary(Slice str);
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// Available only if OpenSSL >= 1.1.0
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static BigNum from_le_binary(Slice str);
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static Result<BigNum> from_decimal(CSlice str);
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static Result<BigNum> from_hex(CSlice str);
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static BigNum from_raw(void *openssl_big_num);
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void set_value(uint32 new_value);
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void ensure_const_time();
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int get_num_bits() const;
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int get_num_bytes() const;
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void set_bit(int num);
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void clear_bit(int num);
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bool is_bit_set(int num) const;
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bool is_prime(BigNumContext &context) const;
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BigNum clone() const;
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string to_binary(int exact_size = -1) const;
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// Available only if OpenSSL >= 1.1.0
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string to_le_binary(int exact_size = -1) const;
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string to_decimal() const;
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void operator+=(uint32 value);
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void operator-=(uint32 value);
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void operator*=(uint32 value);
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void operator/=(uint32 value);
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uint32 operator%(uint32 value) const;
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static void random(BigNum &r, int bits, int top, int bottom);
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static void add(BigNum &r, const BigNum &a, const BigNum &b);
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static void sub(BigNum &r, const BigNum &a, const BigNum &b);
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static void mul(BigNum &r, BigNum &a, BigNum &b, BigNumContext &context);
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static void mod_add(BigNum &r, BigNum &a, BigNum &b, const BigNum &m, BigNumContext &context);
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static void mod_sub(BigNum &r, BigNum &a, BigNum &b, const BigNum &m, BigNumContext &context);
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static void mod_mul(BigNum &r, BigNum &a, BigNum &b, const BigNum &m, BigNumContext &context);
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static void mod_inverse(BigNum &r, BigNum &a, const BigNum &m, BigNumContext &context);
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static void div(BigNum *quotient, BigNum *remainder, const BigNum ÷nd, const BigNum &divisor,
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BigNumContext &context);
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static void mod_exp(BigNum &r, const BigNum &a, const BigNum &p, const BigNum &m, BigNumContext &context);
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static void gcd(BigNum &r, BigNum &a, BigNum &b, BigNumContext &context);
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static int compare(const BigNum &a, const BigNum &b);
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private:
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class Impl;
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unique_ptr<Impl> impl_;
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explicit BigNum(unique_ptr<Impl> &&impl);
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};
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StringBuilder &operator<<(StringBuilder &sb, const BigNum &bn);
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} // namespace td
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#endif
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