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This commit is contained in:
malloc 2018-03-21 23:22:41 -05:00
parent 336c40d809
commit 82f0987d11
2 changed files with 67 additions and 5 deletions
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57
server/src/utils/bigint.cpp
View file

@ -50,8 +50,29 @@ void sosc::BigUInt::RandomPrime(int byte_count) {
} while(!this->IsProbablePrime());
}
bool sosc::BigUInt::IsZero() const {
return
std::all_of(this->value.begin(), this->value.end(),
[](uint8_t x) { return x == 0; });
}
bool sosc::BigUInt::IsOne() const {
if(this->value[0] != 1)
return false;
return this->value.size() == 1
? true
: std::all_of(this->value.begin() + 1, this->value.end(),
[](uint8_t x) { return x == 0; });
}
bool sosc::BigUInt::IsEven() const {
return !this->GetBit(0);
}
bool sosc::BigUInt::IsProbablePrime() const {
// TODO rabin-miller
return false;
}
std::tuple<sosc::BigUInt, sosc::BigUInt> sosc::BigUInt::DivideWithRemainder
@ -100,3 +121,39 @@ sosc::BigUInt sosc::BigUInt::ModPow
return accum;
}
void sosc::BigUInt::SetBit(uint64_t bit, bool value) {
uint64_t byte = bit / 8;
if(byte >= this->ByteCount())
this->value.resize(byte + 1);
if(value)
this->value[byte] |= (1 << (bit % 8));
else
this->value[byte] &= ~(1 << (bit % 8));
}
bool sosc::BigUInt::GetBit(uint64_t bit) const {
uint64_t byte = bit / 8;
if(byte >= this->ByteCount())
return false;
return (this->value[byte] & (1 << (bit % 8))) != 0;
}
sosc::BigUInt sosc::BigUInt::operator + (const BigUInt& rhs) const {
uint64_t sum_range = std::min(this->ByteCount(), rhs.ByteCount());
BigUInt sum;
uint8_t carry = 0;
for(uint64_t i = 0; i < sum_range; ++i) {
}
return sum;
}
sosc::BigUInt& sosc::BigUInt::operator += (const BigUInt& rhs) {
this->Copy(*this + rhs);
return *this;
}

15
server/src/utils/bigint.hpp
View file

@ -5,6 +5,7 @@
#include <string>
#include <vector>
#include <cstdint>
#include <algorithm>
#include "csprng.hpp"
namespace sosc {
@ -34,19 +35,19 @@ public:
void SetBit(uint64_t bit, bool value);
bool GetBit(uint64_t bit) const;
BigUInt& operator + (const BigUInt& rhs) const;
BigUInt operator + (const BigUInt& rhs) const;
BigUInt& operator += (const BigUInt& rhs);
BigUInt& operator - (const BigUInt& rhs) const;
BigUInt operator - (const BigUInt& rhs) const;
BigUInt& operator -= (const BigUInt& rhs);
BigUInt& operator * (const BigUInt& rhs) const;
BigUInt operator * (const BigUInt& rhs) const;
BigUInt& operator *= (const BigUInt& rhs);
BigUInt& operator / (const BigUInt& rhs) const;
BigUInt operator / (const BigUInt& rhs) const;
BigUInt& operator /= (const BigUInt& rhs);
BigUInt& operator % (const BigUInt& rhs) const;
BigUInt operator % (const BigUInt& rhs) const;
bool operator == (const BigUInt& rhs) const;
bool operator > (const BigUInt& rhs) const;
@ -62,6 +63,10 @@ public:
return this->ToString();
}
private:
inline void Copy(const BigUInt& from) {
}
std::vector<uint8_t> value;
};
}