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LibCrypto: Add UnsignedBigInteger subtraction and comparison
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3 changed files with 138 additions and 8 deletions
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@ -35,9 +35,12 @@ public:
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UnsignedBigInteger(u32 x) { m_words.append(x); }
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UnsignedBigInteger() {}
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static UnsignedBigInteger create_invalid();
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const AK::Vector<u32>& words() const { return m_words; }
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UnsignedBigInteger add(const UnsignedBigInteger& other);
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UnsignedBigInteger sub(const UnsignedBigInteger& other);
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size_t length() const { return m_words.size(); }
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@ -45,15 +48,26 @@ public:
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size_t trimmed_length() const;
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bool operator==(const UnsignedBigInteger& other) const;
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bool operator<(const UnsignedBigInteger& other) const;
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void invalidate() { m_is_invalid = true; }
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bool is_invalid() const { return m_is_invalid; }
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private:
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AK::Vector<u32> m_words;
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// Used to indicate a negative result, or a result of an invalid operation
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bool m_is_invalid { false };
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};
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}
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inline const LogStream& operator<<(const LogStream& stream, const Crypto::UnsignedBigInteger value)
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{
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if (value.is_invalid()) {
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stream << "Invalid BigInt";
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return stream;
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}
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for (int i = value.length() - 1; i >= 0; --i) {
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stream << value.words()[i] << "|";
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}
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