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AK: Add constant time equality and zero check to UFixedBigInt

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This commit is contained in:
Michiel Visser 2022-03-08 11:46:04 +01:00 • committed by Ali Mohammad Pur
parent 590dcb0581
commit 3d561abe15
1 changed files with 26 additions and 0 deletions
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26
AK/UFixedBigInt.h
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@ -764,6 +764,32 @@ public:
return log2() / base.log2(); return log2() / base.log2();
} }
constexpr u64 fold_or() const requires(IsSame<T, u64>)
{
return m_low | m_high;
}
constexpr u64 fold_or() const requires(!IsSame<T, u64>)
{
return m_low.fold_or() | m_high.fold_or();
}
constexpr bool is_zero_constant_time() const
{
return fold_or() == 0;
}
constexpr u64 fold_xor_pair(R& other) const requires(IsSame<T, u64>)
{
return (m_low ^ other.low()) | (m_high ^ other.high());
}
constexpr u64 fold_xor_pair(R& other) const requires(!IsSame<T, u64>)
{
return (m_low.fold_xor_pair(other.low())) | (m_high.fold_xor_pair(other.high()));
}
constexpr bool is_equal_to_constant_time(R& other)
{
return fold_xor_pair(other) == 0;
}
private: private:
T m_low; T m_low;
T m_high; T m_high;