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#ifndef CERT_TRANS_UTIL_BIGNUM_H_
#define CERT_TRANS_UTIL_BIGNUM_H_
#include <openssl/bn.h>
#include <cassert>
namespace cert_trans {
class BigNum {
public:
BigNum();
explicit BigNum(int64_t w);
BigNum(const BigNum& other);
~BigNum();
const BIGNUM* bn() const;
BIGNUM* bn();
int num_bits() const;
BigNum& operator-=(const BigNum& n);
BigNum& operator-=(int64_t n);
BigNum& operator+=(const BigNum& n);
BigNum& operator+=(int64_t n);
BigNum& operator<<=(int n);
BigNum& operator>>=(int n);
private:
BIGNUM bn_;
friend bool operator==(const BigNum& a, const BigNum& b);
friend bool operator==(const BigNum& a, int64_t b);
friend bool operator<(const BigNum& a, const BigNum& b);
friend bool operator<(const BigNum& a, int64_t b);
friend bool operator>(const BigNum& a, const BigNum& b);
friend bool operator>(const BigNum& a, int64_t b);
};
inline const BIGNUM* BigNum::bn() const {
return &bn_;
}
inline BIGNUM* BigNum::bn() {
return &bn_;
}
inline int BigNum::num_bits() const {
return BN_num_bits(&bn_);
}
inline BigNum& BigNum::operator-=(const BigNum& n) {
assert(BN_sub(&bn_, &bn_, &n.bn_) == 1);
return *this;
}
inline BigNum& BigNum::operator-=(int64_t n) {
assert(BN_sub_word(&bn_, n) == 1);
return *this;
}
inline BigNum& BigNum::operator+=(const BigNum& n) {
assert(BN_add(&bn_, &bn_, &n.bn_) == 1);
return *this;
}
inline BigNum& BigNum::operator+=(int64_t n) {
assert(BN_add_word(&bn_, n) == 1);
return *this;
}
inline BigNum& BigNum::operator<<=(int n) {
assert(BN_lshift(&bn_, &bn_, n) == 1);
return *this;
}
inline BigNum& BigNum::operator>>=(int n) {
assert(BN_rshift(&bn_, &bn_, n) == 1);
return *this;
}
template <typename T, typename U>
inline BigNum operator+(const T& a, const U& b) {
BigNum r(a);
r += b;
return r;
}
template <typename T, typename U>
inline BigNum operator-(const T& a, const U& b) {
BigNum r(a);
r -= b;
return r;
}
inline BigNum operator<<(const BigNum& a, int n) {
BigNum r(a);
r <<= n;
return r;
}
inline BigNum operator>>(const BigNum& a, int n) {
BigNum r(a);
r >>= n;
return r;
}
inline bool operator==(const BigNum& a, const BigNum& b) {
return BN_cmp(&a.bn_, &b.bn_) == 0;
}
namespace internal {
inline const BigNum& AsBigNum(const BigNum& n) {
return n;
}
inline BigNum AsBigNum(int64_t n) {
return BigNum(n);
}
} // namespace internal
template <typename T, typename U>
inline bool operator==(const T& a, const U& b) {
return internal::AsBigNum(a) == internal::AsBigNum(b);
}
inline bool operator<(const BigNum& a, const BigNum& b) {
return BN_cmp(&a.bn_, &b.bn_) < 0;
}
template <typename T, typename U>
inline bool operator<(const T& a, const U& b) {
return internal::AsBigNum(a) < internal::AsBigNum(b);
}
inline bool operator>(const BigNum& a, const BigNum& b) {
return BN_cmp(&a.bn_, &b.bn_) > 0;
}
template <typename T, typename U>
inline bool operator>(const T& a, const U& b) {
return internal::AsBigNum(a) > internal::AsBigNum(b);
}
} // namespace cert_trans
#endif // CERT_TRANS_UTIL_BIGNUM_H_
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