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LibCrypto: Add UnsignedBigInteger subtraction and comparison

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Itamar 2020-04-08 13:07:47 +03:00 • committed by Andreas Kling
parent 6201f741d4
commit e0cf40518c
3 changed files with 138 additions and 8 deletions
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14
Libraries/LibCrypto/BigInt/UnsignedBigInteger.h
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@ -35,9 +35,12 @@ public:
UnsignedBigInteger(u32 x) { m_words.append(x); }
UnsignedBigInteger() {}
static UnsignedBigInteger create_invalid();
const AK::Vector<u32>& words() const { return m_words; }
UnsignedBigInteger add(const UnsignedBigInteger& other);
UnsignedBigInteger sub(const UnsignedBigInteger& other);
size_t length() const { return m_words.size(); }
@ -45,15 +48,26 @@ public:
size_t trimmed_length() const;
bool operator==(const UnsignedBigInteger& other) const;
bool operator<(const UnsignedBigInteger& other) const;
void invalidate() { m_is_invalid = true; }
bool is_invalid() const { return m_is_invalid; }
private:
AK::Vector<u32> m_words;
// Used to indicate a negative result, or a result of an invalid operation
bool m_is_invalid { false };
};
}
inline const LogStream& operator<<(const LogStream& stream, const Crypto::UnsignedBigInteger value)
{
if (value.is_invalid()) {
stream << "Invalid BigInt";
return stream;
}
for (int i = value.length() - 1; i >= 0; --i) {
stream << value.words()[i] << "|";
}