Uint 256 T
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/**
* @file
*
* @details Implementation of 256-bit unsigned integers.
* @note The implementation can be flagged as not completed. This header is used
* with enough operations to demonstrate the usage of ECDH (Elliptic Curve
* Diffie-Hellman) Key exchange.
* @author [Ashish Daulatabad](https://github.com/AshishYUO)
*/
#include <string> /// for `std::string`
#include <utility> /// for `std::pair` library
#include "uint128_t.hpp" /// for uint128_t integer
#ifndef CIPHERS_UINT256_T_HPP_
#define CIPHERS_UINT256_T_HPP_
class uint256_t;
template <>
struct std::is_integral<uint256_t> : std::true_type {};
template <>
struct std::is_arithmetic<uint256_t> : std::true_type {};
template <>
struct std::is_unsigned<uint256_t> : std::true_type {};
/**
* @class uint256_t
* @brief class for 256-bit unsigned integer
*/
class uint256_t {
uint128_t f{}, s{}; /// First and second half of 256 bit number
/**
* @brief Get integer from given string.
* @details Create an integer from a given string
* @param str integer string, can be hexadecimal (starting on 0x... or
* number)
* @returns void
*/
void __get_integer_from_string(const std::string &str) {
this->f = this->s = uint128_t(0);
if (str.size() > 1 && str[1] == 'x') {
for (auto i = 2; i < str.size(); ++i) {
*this *= 16LL;
if (str[i] >= '0' && str[i] <= '9') {
*this += (str[i] - '0');
} else if (str[i] >= 'A' && str[i] <= 'F') {
*this += (str[i] - 'A' + 10);
} else if (str[i] >= 'a' && str[i] <= 'f') {
*this += (str[i] - 'a' + 10);
}
}
} else {
for (auto &x : str) {
*this *= 10LL;
*this += (x - '0');
}
}
}
public:
// Constructors
uint256_t() = default;
/**
* @brief Parameterized constructor
* @tparam T template for integer types
* @param low Integer denoting lower 128-bits
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
explicit uint256_t(T low) : s(low), f(0) {}
/**
* @brief Parameterized constructor
* @param str Integer string (hexadecimal starting with 0x.. or decimal)
*/
explicit uint256_t(const std::string &str) {
__get_integer_from_string(str);
}
/**
* @brief Copy constructor
* @param num 256-bit unsigned integer
*/
uint256_t(const uint256_t &num) = default;
/**
* @brief Move constructor
* @param num 256-bit unsigned integer
*/
uint256_t(uint256_t &&num) noexcept
: f(std::move(num.f)), s(std::move(num.s)) {}
/**
* @brief Parameterized constructor
* @param high higher part 128-bit unsigned integer
* @param low lower part 128-bit unsigned integer
*/
uint256_t(uint128_t high, uint128_t low)
: f(std::move(high)), s(std::move(low)) {}
/**
* @brief Parameterized constructor
* @param high higher part 64-bit unsigned integer
* @param low lower part 64-bit unsigned integer
*/
uint256_t(const uint64_t high, const uint64_t low) : f(high), s(low) {}
/**
* @brief Destructor for uint256_t
*/
~uint256_t() = default;
/**
* @brief Leading zeroes in binary
* @details Calculates leading zeros in 256-bit integer
* @returns Integer denoting leading zeroes
*/
inline uint32_t _lez() {
if (f) {
return f._lez();
}
return 128 + s._lez();
}
/**
* @brief Trailing zeroes in binary
* @details Calculates leading zeros in 256-bit integer
* @returns Integer denoting Trailing zeroes
*/
inline uint32_t _trz() {
if (s) {
return s._trz();
}
return 128 + f._trz();
}
/**
* @brief casting operator to boolean value
* @returns true if value of this is non-zero, else false
*/
inline explicit operator bool() const { return f || s; }
/**
* @brief casting operator to any integer value
* @tparam T any integer type
* @returns integer value casted to mentioned type
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline explicit operator T() const {
return static_cast<T>(s);
}
/**
* @brief casting operator to uint128_t
* @returns returns lower 128-bit integer part
*/
inline explicit operator uint128_t() const { return s; }
/**
* @brief returns lower 128-bit integer part
* @returns returns lower 128-bit integer part
*/
inline uint128_t lower() const { return s; }
/**
* @brief returns upper 128-bit integer part
* @returns returns upper 128-bit integer part
*/
inline uint128_t upper() const { return f; }
/**
* @brief operator = for uint256_t
* @param p an 256-bit integer to assign it's value
* @returns this pointer with it's value equal to `p`
*/
inline uint256_t &operator=(const uint256_t &p) = default;
/**
* @brief operator = for other types
* @tparam T denoting any integer type
* @param p an integer to assign it's value
* @returns this pointer with it's value equal to `p`
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline uint256_t &operator=(const T &p) {
this->s = p;
return *this;
}
/**
* @brief operator = for type string
* @param p a string to assign it's value to equivalent integer
* @returns this pointer with it's value equal to `p`
*/
inline uint256_t &operator=(const std::string &p) {
__get_integer_from_string(p);
return *this;
}
/**
* @brief Move assignment operator
*/
inline uint256_t &operator=(uint256_t &&p) = default;
/**
* @brief operator + for uint256_t and other integer types.
* @tparam T denoting integral type
* @param p a type of integer variable
* @returns addition of this and p, returning uint256_t integer
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline uint256_t operator+(const T &p) {
bool app = s + p < s;
return uint256_t(f + app, s + p);
}
/**
* @brief operator + for uint256_t and other integer types.
* @param p 256-bit unsigned integer
* @returns addition of this and p, returning uint256_t integer
*/
inline uint256_t operator+(const uint256_t &p) {
bool app = (s + p.s < s);
return {f + app + p.f, s + p.s};
}
/**
* @brief operator += for uint256_t and other integer types.
* @tparam T denoting integral type
* @param p a type of integer variable
* @returns addition of this and p, returning this
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline uint256_t &operator+=(const T &p) {
bool app = (p + s < s);
this->f += app;
this->s += p;
return *this;
}
/**
* @brief operator += for uint256_t
* @param p 256-bit unsigned integer
* @returns addition of this and p, returning this
*/
inline uint256_t &operator+=(const uint256_t &p) {
bool app = (s + p.s < s);
f = f + app + p.f;
s = s + p.s;
return *this;
}
/**
* @brief pre-increment operator
* @returns incremented value of this.
*/
inline uint256_t &operator++() {
*this += 1;
return *this;
}
/**
* @brief post-increment operator
* @returns incremented value of this.
*/
inline uint256_t operator++(int) {
++*this;
return *this;
}
/**
* @brief operator - for uint256_t and other integer types.
* @tparam T denoting integral type
* @param p a type of integer variable
* @returns subtraction of this and p, returning uint256_t integer
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline uint256_t operator-(const T &p) {
bool app = (p > s);
return uint256_t(f - app, s - p);
}
/**
* @brief operator - for uint256_t
* @param p a type of integer variable
* @returns subtraction of this and p, returning uint256_t integer
*/
inline uint256_t operator-(const uint256_t &p) {
bool app = s < p.s;
return {f - p.f - app, s - p.s};
}
/**
* @brief operator - using twos complement
* @returns 2's complement of this.
*/
inline uint256_t operator-() { return ~*this + uint256_t(1); }
/**
* @brief operator -- (pre-decrement)
* @returns decremented value of this
*/
inline uint256_t &operator--() {
*this -= 1;
return *this;
}
/**
* @brief operator -- (post-decrement)
* @returns decremented value of this
*/
inline uint256_t operator--(int p) {
--*this;
return *this;
}
/**
* @brief operator -= for uint256_t and other integer types.
* @tparam T denoting integral type
* @param p a type of integer variable
* @returns subtraction of this and p, returning this
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline uint256_t operator-=(const T p) {
bool app = (p > s);
f = f - app;
s = s - p;
return *this;
}
/**
* @brief operator -= for uint256_t
* @param p 256-bit unsigned integer
* @returns subtraction of this and p, returning this
*/
inline uint256_t &operator-=(const uint256_t &p) {
bool app = s < p.s;
f = f - app - p.f;
s = s - p.s;
return *this;
}
/**
* @brief operator * for uint256_t and other integer types.
* @tparam T denoting integral type
* @param p a type of integer variable
* @returns multiplication of this and p, returning uint256_t integer
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline uint256_t operator*(const T &p) {
return *this * uint256_t(p);
}
/**
* @brief operator * for uint256_t and other integer types.
* @param p 256-bit unsigned integer
* @returns multiplication of this and p, returning uint256_t integer
*/
uint256_t operator*(const uint256_t &p) {
uint128_t f_first(s.upper()), f_second(s.lower()), s_first(p.s.upper()),
s_second(p.s.lower());
uint128_t fi = f_first * s_first, se = f_first * s_second,
th = s_first * f_second, fo = s_second * f_second;
uint128_t tmp = se << 64, tmp2 = th << 64;
int cc = (tmp + tmp2 < tmp);
tmp += tmp2;
cc += (tmp + fo < tmp);
return {f * p.s + s * p.f + fi + se.upper() + th.upper() + cc,
tmp + fo};
}
/**
* @brief operator *= for uint256_t and other integer types.
* @tparam T denoting integral type
* @param p a type of integer variable
* @returns multiplication of this and p, returning this
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline uint256_t &operator*=(const T &p) {
return (*this *= uint256_t(p));
}
/**
* @brief operator *= for uint256_t and other integer types.
* @param p 256-bit unsigned integer
* @returns multiplication of this and p, returning this
*/
uint256_t &operator*=(const uint256_t &p) {
uint128_t f_first(s.upper()), f_second(s.lower()), s_first(p.s.upper()),
s_second(p.s.lower());
uint128_t fi = f_first * s_first, se = f_first * s_second,
th = s_first * f_second, fo = s_second * f_second;
uint128_t tmp = se << 64, tmp2 = th << 64;
int cc = (tmp + tmp2 < tmp);
tmp += tmp2;
cc += (tmp + fo < tmp);
f = f * p.s + s * p.f + fi + se.upper() + th.upper() + cc;
s = tmp + fo;
return *this;
}
/**
* @brief divide function for uint256_t and other integer types.
* @details divide this value and
* @param p 256-bit unsigned integer
* @returns pair denoting quotient and remainder.
*/
std::pair<uint256_t, uint256_t> divide(const uint256_t &p) {
if (*this < p) { // if this is less than divisor
return {uint256_t(0), *this};
} else if (*this == p) { // if this is equal to divisor
return {uint256_t(1), uint256_t(0)};
}
uint256_t tmp = p, tmp2 = *this;
uint16_t left = tmp._lez() - _lez();
tmp <<= left;
uint256_t quotient(0);
uint256_t zero(0);
while (tmp2 >= p) {
uint16_t shf = tmp2._lez() - tmp._lez();
if (shf) {
tmp >>= shf;
quotient <<= shf;
left -= shf;
}
if (tmp2 < tmp) {
tmp >>= 1;
quotient <<= 1;
--left;
}
tmp2 -= tmp;
++quotient;
}
return {quotient << left, tmp2};
}
/**
* @brief operator / for uint256_t and other integer types.
* @tparam T denoting integral type
* @param p a type of integer variable
* @returns unsigned 256-bit quotient.
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline uint256_t operator/(const T &p) {
uint256_t tmp = *this;
tmp /= uint256_t(p);
return tmp;
}
/**
* @brief operator / for uint256_t and other integer types.
* @param p 256-bit unsigned integer
* @returns unsigned 256-bit quotient.
*/
inline uint256_t operator/(const uint256_t &p) { return divide(p).first; }
/**
* @brief operator /= for uint256_t
* @param p 256-bit unsigned integer
* @returns this set as unsigned 256-bit quotient.
*/
inline uint256_t &operator/=(const uint256_t &p) {
*this = divide(p).first;
return *this;
}
/**
* @brief operator /= for uint256_t and other integer types.
* @tparam T denoting integral type
* @param p a type of integer variable
* @returns this set as unsigned 256-bit quotient.
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline uint256_t &operator/=(const T &p) {
*this /= uint256_t(p);
return *this;
}
/**
* @brief operator % for uint256_t
* @param p 256-bit unsigned integer
* @returns unsigned 256-bit remainder.
*/
inline uint256_t operator%(const uint256_t &p) { return divide(p).second; }
/**
* @brief operator % for uint256_t and other integer types.
* @tparam T denoting integral type
* @param p a type of integer variable
* @returns unsigned 256-bit remainder.
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline uint256_t operator%(const T &p) {
uint256_t tmp = *this;
tmp %= uint256_t(p);
return tmp;
}
/**
* @brief operator %= for uint256_t
* @param p 256-bit unsigned integer
* @returns this set as unsigned 256-bit remainder.
*/
inline uint256_t &operator%=(const uint256_t &p) {
*this = divide(p).second;
return *this;
}
/**
* @brief operator %= for uint256_t
* @tparam T denoting integral type
* @param p a type of integer variable
* @returns this set as unsigned 256-bit remainder.
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline uint256_t &operator%=(const T &p) {
*this %= uint256_t(p);
return *this;
}
/**
* @brief operator < for uint256_t
* @param other number to be compared with this
* @returns true if this is less than other, else false
*/
inline bool operator<(const uint256_t &other) {
return f < other.f || (f == other.f && s < other.s);
}
/**
* @brief operator <= for uint256_t
* @param other number to be compared with this
* @returns true if this is less than or equal to other, else false
*/
inline bool operator<=(const uint256_t &other) {
return f < other.f || (f == other.f && s <= other.s);
}
/**
* @brief operator > for uint256_t
* @param other number to be compared with this
* @returns true if this is greater than other, else false
*/
inline bool operator>(const uint256_t &other) {
return f > other.f || (f == other.f && s > other.s);
}
/**
* @brief operator >= for uint256_t
* @param other number to be compared with this
* @returns true if this is greater than or equal than other, else false
*/
inline bool operator>=(const uint256_t &other) {
return (f > other.f) || (f == other.f && s >= other.s);
}
/**
* @brief operator == for uint256_t
* @param other number to be compared with this
* @returns true if this is equal than other, else false
*/
inline bool operator==(const uint256_t &other) {
return f == other.f && s == other.s;
}
/**
* @brief operator != for uint256_t
* @param other number to be compared with this
* @returns true if this is not equal than other, else false
*/
inline bool operator!=(const uint256_t &other) {
return !((*this) == other);
}
/**
* @brief operator ! for uint256_t
* @returns true if this has zero value, else false
*/
inline bool operator!() { return !f && !s; }
/**
* @brief operator && for uint256_t
* @param b number to be compared with this
* @returns true if both of the values are not zero, else false
*/
inline bool operator&&(const uint256_t &b) {
return (s || f) && (b.s || b.f);
}
/**
* @brief operator || for uint256_t
* @param b number to be compared with this
* @returns true if one of the values are not zero, else false
*/
inline bool operator||(const uint256_t &b) {
return (s || f) || (b.s || b.f);
}
/**
* @brief operator () for uint256_t
* @returns true if this value is non-zero, else false
*/
inline bool operator()() { return s || f; }
/**
* @brief operator < for other types
* @tparam T integral type
* @param other number to be compared with this
* @returns true if this is less than other, else false
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
bool operator<(const T &other) {
return *this < uint256_t(other);
}
/**
* @brief operator <= for other types
* @tparam T integral type
* @param other number to be compared with this
* @returns true if this is less than or equal to other, else false
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
bool operator<=(const T &other) {
return *this <= uint256_t(other);
}
/**
* @brief operator > for other types
* @tparam T integral type
* @param other number to be compared with this
* @returns true if this is greater than other, else false
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
bool operator>(const T &other) {
return *this > uint256_t(other);
}
/**
* @brief operator >= for other types
* @tparam T integral type
* @param other number to be compared with this
* @returns true if this is greater than or equal other, else false
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
bool operator>=(const T &other) {
return *this >= uint256_t(other);
}
/**
* @brief operator == for other types
* @tparam T integral type
* @param other number to be compared with this
* @returns true if this is equal to other, else false
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
bool operator==(const T &other) {
return *this == uint256_t(other);
}
/**
* @brief operator != for other types
* @tparam T integral type
* @param other number to be compared with this
* @returns true if this is not equal to other, else false
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
bool operator!=(const T &other) {
return *this != uint256_t(other);
}
/**
* @brief operator && for other types
* @tparam T integral type
* @param other number to be compared with this
* @returns true if this is both values are non-zero, else false
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline bool operator&&(const T &b) {
return (s || f) && (b);
}
/**
* @brief operator || for other types
* @tparam T integral type
* @param other number to be compared with this
* @returns true if this is either one of the values are non-zero, else
* false
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline bool operator||(const T &b) {
return (s || f) || (b);
}
/**
* @brief operator ~ for uint256_t
* @returns 1's complement of this number
*/
inline uint256_t operator~() { return {~f, ~s}; }
/**
* @brief operator << for uint256_t
* @tparam T integral type
* @param p number denoting number of shifts
* @returns value of this shifted by p to left
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
uint256_t operator<<(const T &p) {
if (!p) {
return {this->f, this->s};
} else if (p >= 128) {
return uint256_t((this->s << (p - 128)), uint128_t(0));
}
return uint256_t((this->f << p) + (this->s >> (128 - p)),
(this->s << p));
}
/**
* @brief operator <<= for uint256_t
* @tparam T integral type
* @param p number denoting number of shifts
* @returns this shifted by p to left
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
uint256_t &operator<<=(const T &p) {
if (p) {
if (p >= 128) {
this->f = (this->s << (p - 128));
this->s = uint128_t(0);
} else {
f = ((this->s >> (128 - p)) + (this->f << p));
s = (this->s << p);
}
}
return *this;
}
/**
* @brief operator >> for uint256_t
* @tparam T integral type
* @param p number denoting number of shifts
* @returns value of this shifted by p to right
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
uint256_t operator>>(const T &p) {
if (!p) {
return {this->f, this->s};
} else if (p >= 128) {
return uint256_t(uint128_t(0), (this->f >> (p - 128)));
}
return uint256_t((this->f >> p),
(this->s >> p) + (this->f << (128 - p)));
}
/**
* @brief operator >>= for uint256_t
* @tparam T integral type
* @param p number denoting number of shifts
* @returns this shifted by p to right
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
uint256_t &operator>>=(const T &p) {
if (p) {
if (p >= 128) {
f = uint128_t(0);
s = (this->f >> (p - 128));
} else {
s = (this->s >> p) + (this->f << (128 - p));
f = (this->f >> p);
}
}
return *this;
}
/**
* @brief operator & for other types (bitwise operator)
* @tparam T integral type
* @param p number to be operated
* @returns value of this & p (& is bit-wise operator)
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline uint256_t operator&(const T &p) {
return *this & uint256_t(p);
}
/**
* @brief operator & for uint256_t (bitwise operator)
* @param p number to be operated
* @returns value of this & p (& is bit-wise operator)
*/
inline uint256_t operator&(const uint256_t &p) {
return {f & p.f, s & p.s};
}
/**
* @brief operator &= for uint256_t (bitwise operator)
* @param p number to be operated
* @returns this = this & p (& is bit-wise operator)
*/
inline uint256_t &operator&=(const uint256_t &p) {
f &= p.f;
s &= p.s;
return *this;
}
/**
* @brief operator &= for other types (bitwise operator)
* @tparam T integral type
* @param p number to be operated
* @returns this = this & p (& is bit-wise operator)
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline uint256_t &operator&=(const T p) {
s &= p.s;
return *this;
}
/**
* @brief operator | for other types (bitwise operator)
* @tparam T integral type
* @param p number to be operated
* @returns value of this | p (| is bit-wise operator)
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline uint256_t operator|(const T &p) {
return *this | uint256_t(p);
}
/**
* @brief operator | for uint256_t (bitwise operator)
* @param p number to be operated
* @returns value of this | p (| is bit-wise OR operator)
*/
inline uint256_t operator|(const uint256_t &p) {
return {this->f | p.f, this->s | p.s};
}
/**
* @brief operator |= for other types (bitwise operator)
* @tparam T integral type
* @param p number to be operated
* @returns this = this | p (| is bit-wise OR operator)
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline uint256_t &operator|=(const T &p) {
s |= p;
return *this;
}
/**
* @brief operator |= for uint256_t (bitwise operator)
* @param p number to be operated
* @returns this = this | p (| is bit-wise OR operator)
*/
inline uint256_t &operator|=(const uint256_t &p) {
f |= p.f;
s |= p.s;
return *this;
}
/**
* @brief operator ^ for other types (bitwise operator)
* @tparam T integral type
* @param p number to be operated
* @returns value of this ^ p (^ is bit-wise XOR operator)
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline uint256_t operator^(const T &p) {
return uint256_t(f, s ^ p);
}
/**
* @brief operator ^ for uint256_t (bitwise operator)
* @param p number to be operated
* @returns value of this ^ p (^ is bit-wise XOR operator)
*/
inline uint256_t operator^(const uint256_t &p) {
return {this->f ^ p.f, this->s ^ p.s};
}
/**
* @brief operator ^= for uint256_t (bitwise operator)
* @param p number to be operated
* @returns this = this ^ p (^ is bit-wise XOR operator)
*/
inline uint256_t &operator^=(const uint256_t &p) {
f ^= p.f;
s ^= p.s;
return *this;
}
/**
* @brief operator ^= for other types (bitwise operator)
* @tparam T integral type
* @param p number to be operated
* @returns this = this ^ p (^ is bit-wise XOR operator)
*/
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline uint256_t &operator^=(const T &p) {
s ^= p;
return *this;
}
/**
* @brief operator << for printing uint256_t integer
* @details Prints the uint256_t integer in decimal form
* @note Note that this operator is costly since it uses strings to print
* the value
* @param op ostream object
* @param p 256-bit integer
* @returns op, ostream object.
*/
friend std::ostream &operator<<(std::ostream &op, uint256_t p) {
if (!p.f) {
op << p.s;
} else {
std::string out = "0", p_2 = "1";
uint128_t L(1);
for (uint64_t i = 0; i < 128; ++i) {
if ((p.s & L)) {
out = add(out, p_2);
}
p_2 = add(p_2, p_2);
L <<= 1;
}
L = uint128_t(1);
for (int i = 0; i < 128; ++i) {
if ((p.f & L)) {
out = add(out, p_2);
}
p_2 = add(p_2, p_2);
L <<= 1;
}
op << out;
}
return op;
}
};
// Artihmetic
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline uint256_t operator+(const T p, const uint256_t &q) {
return uint256_t(p) + q;
}
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline uint256_t operator-(const T p, const uint256_t &q) {
return (uint256_t(p) - q);
}
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline uint256_t operator*(const T p, const uint256_t &q) {
return uint256_t(p) * q;
}
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline uint256_t operator/(const T p, const uint256_t &q) {
return uint256_t(p) / q;
}
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline uint256_t operator%(const T p, const uint256_t &q) {
return uint256_t(p) % q;
}
// Bitwise operators
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline uint256_t operator&(const T &p, const uint256_t &q) {
return uint256_t(p) & q;
}
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline uint256_t operator|(const T p, const uint256_t &q) {
return uint256_t(p) | q;
}
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline uint256_t operator^(const T p, const uint256_t &q) {
return uint256_t(p) ^ q;
}
// Boolean operators
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline bool operator&&(const T p, const uint256_t &q) {
return uint256_t(p) && q;
}
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline bool operator||(const T p, const uint256_t &q) {
return uint256_t(p) || q;
}
// Comparison operators
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline bool operator==(const T p, const uint256_t &q) {
return uint256_t(p) == q;
}
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline bool operator!=(const T p, const uint256_t &q) {
return uint256_t(p) != q;
}
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline bool operator<(const T p, const uint256_t &q) {
return uint256_t(p) < q;
}
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline bool operator<=(const T p, const uint256_t &q) {
return uint256_t(p) <= q;
}
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline bool operator>(const T p, const uint256_t &q) {
return uint256_t(p) > q;
}
template <typename T, typename = typename std::enable_if<
std::is_integral<T>::value, T>::type>
inline bool operator>=(const T p, const uint256_t &q) {
return uint256_t(p) >= q;
}
#endif // CIPHERS_UINT256_T_HPP_
