big_integer.hpp

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#pragma once
 
// BigInteger — arbitrary-precision integer for cryptographic operations.
// Wraps Mbed TLS MPI (Multi-Precision Integer) for RSA key operations.
 
#include <string>
#include <string_view>
#include <vector>
#include <cstdint>
#include <optional>
 
namespace pulp::runtime {

class BigInteger {
public:
    BigInteger();
    BigInteger(uint64_t value);
    BigInteger(const BigInteger& other);
    BigInteger(BigInteger&& other) noexcept;
    ~BigInteger();
 
    BigInteger& operator=(const BigInteger& other);
    BigInteger& operator=(BigInteger&& other) noexcept;

    static BigInteger from_string(std::string_view decimal);

    static BigInteger from_hex(std::string_view hex);

    std::string to_string() const;

    std::string to_hex() const;

    bool is_zero() const;

    size_t bit_count() const;

    BigInteger operator+(const BigInteger& other) const;
    BigInteger operator*(const BigInteger& other) const;
    BigInteger operator%(const BigInteger& other) const;

    BigInteger mod_pow(const BigInteger& exp, const BigInteger& modulus) const;

    bool operator==(const BigInteger& other) const;
    bool operator!=(const BigInteger& other) const;
    bool operator<(const BigInteger& other) const;
 
private:
    struct Impl;
    Impl* impl_;
};
 
}  // namespace pulp::runtime