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- #include "Scalar.hpp"
- extern const scalar_t bn_n;
- const mpz_class Scalar::mpz_bn_p("8FB501E34AA387F9AA6FECB86184DC21EE5B88D120B5B59E185CAC6C5E089667", 16);
- Scalar::Scalar()
- {
- element = 0;
- }
- Scalar::Scalar(const scalar_t& input)
- {
- set(input);
- }
- Scalar::Scalar(mpz_class input)
- {
- set(input);
- }
- void Scalar::set(const scalar_t& input)
- {
- std::stringstream bufferstream;
- std::string buffer;
- mpz_class temp;
- bufferstream << std::hex << input[3] << input[2] << input[1] << input[0];
- bufferstream >> buffer;
-
- temp.set_str(buffer, 16);
- mpz_mod(temp.get_mpz_t(), temp.get_mpz_t(), mpz_bn_p.get_mpz_t());
- element = temp;
- }
- void Scalar::set(mpz_class input)
- {
- mpz_class temp = input;
- mpz_mod(temp.get_mpz_t(), temp.get_mpz_t(), mpz_bn_p.get_mpz_t());
- element = temp;
- }
- void Scalar::set_random()
- {
- scalar_t temp;
-
- /* When we ask for a random number,
- * we really mean a seed to find a random element of a group
- * and the order of the curve either is bn_n or is divided by it
- * (not bn_p) */
- scalar_setrandom(temp, bn_n);
- set(temp);
- }
- Scalar Scalar::operator+(const Scalar& b) const
- {
- mpz_class temp = element + b.element;
- mpz_mod(temp.get_mpz_t(), temp.get_mpz_t(), mpz_bn_p.get_mpz_t());
- return Scalar(temp);
- }
- Scalar Scalar::operator-(const Scalar& b) const
- {
- mpz_class temp = element - b.element;
- mpz_mod(temp.get_mpz_t(), temp.get_mpz_t(), mpz_bn_p.get_mpz_t());
- return Scalar(temp);
- }
- Scalar Scalar::operator*(const Scalar& b) const
- {
- mpz_class temp = element * b.element;
- mpz_mod(temp.get_mpz_t(), temp.get_mpz_t(), mpz_bn_p.get_mpz_t());
- return Scalar(temp);
- }
- Scalar Scalar::operator/(const Scalar& b) const
- {
- mpz_class temp;
- mpz_invert(temp.get_mpz_t(), b.element.get_mpz_t(), mpz_bn_p.get_mpz_t());
- temp *= element;
- mpz_mod(temp.get_mpz_t(), temp.get_mpz_t(), mpz_bn_p.get_mpz_t());
- return Scalar(temp);
- }
- Scalar& Scalar::operator++()
- {
- element++;
- mpz_mod(element.get_mpz_t(), element.get_mpz_t(), mpz_bn_p.get_mpz_t());
- return *this;
- }
- Scalar Scalar::operator++(int)
- {
- Scalar retval = *this;
-
- element++;
- mpz_mod(element.get_mpz_t(), element.get_mpz_t(), mpz_bn_p.get_mpz_t());
- return retval;
- }
- Scalar& Scalar::operator--()
- {
- element--;
- mpz_mod(element.get_mpz_t(), element.get_mpz_t(), mpz_bn_p.get_mpz_t());
- return *this;
- }
- Scalar Scalar::operator--(int)
- {
- Scalar retval = *this;
-
- element--;
- mpz_mod(element.get_mpz_t(), element.get_mpz_t(), mpz_bn_p.get_mpz_t());
- return retval;
- }
- void Scalar::mult(curvepoint_fp_t rop, const curvepoint_fp_t& op1) const
- {
- SecretScalar secret_element = to_scalar_t();
- curvepoint_fp_scalarmult_vartime(rop, op1, secret_element.expose());
- }
- void Scalar::mult(twistpoint_fp2_t rop, const twistpoint_fp2_t& op1) const
- {
- SecretScalar secret_element = to_scalar_t();
- twistpoint_fp2_scalarmult_vartime(rop, op1, secret_element.expose());
- }
- void Scalar::mult(fp12e_t rop, const fp12e_t& op1) const
- {
- SecretScalar secret_element = to_scalar_t();
- fp12e_pow_vartime(rop, op1, secret_element.expose());
- }
- bool Scalar::operator==(const Scalar& b) const
- {
- return element == b.element;
- }
- bool Scalar::operator!=(const Scalar& b) const
- {
- return element != b.element;
- }
- Scalar::SecretScalar::SecretScalar()
- { }
- Scalar::SecretScalar::SecretScalar(const Scalar& input)
- {
- set(input.element);
- }
- Scalar::SecretScalar::SecretScalar(mpz_class input)
- {
- set(input);
- }
- const scalar_t& Scalar::SecretScalar::expose() const
- {
- return element;
- }
- void Scalar::SecretScalar::set(mpz_class input)
- {
- std::stringstream buffer;
- char temp[17];
- buffer << std::setfill('0') << std::setw(64) << input.get_str(16);
- for (int i = 3; i >= 0; i--)
- {
- buffer.get(temp, 17);
- element[i] = strtoull(temp, NULL, 16);
- }
- }
-
- Scalar::SecretScalar Scalar::to_scalar_t() const
- {
- return SecretScalar(element);
- }
- std::ostream& operator<<(std::ostream& os, const Scalar& output)
- {
- os << output.element;
- return os;
- }
- std::istream& operator>>(std::istream& is, Scalar& input)
- {
- is >> input.element;
- return is;
- }
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