class SHA1Hash {
public:
    static StatusWith<SHA1Hash> fromBuffer(const uint8_t* input, size_t
inputLen);

    // The current factory functions
    static SHA1Hash computeHash(const uint8_t* input, size_t inputLen);
    static SHA1Hash computeHmac(const uint8_t* key, size_t keyLen, const
uint8_t* input, size_t inputLen);

    const uint8_t* data() const { return _hash.data(); }
    size_t size() const { return _hash.size(); }

    std::array<uint8_t, 20> asArray() const { return _hash; }

    std::toString() const;
    bool operator==(const SHA1Hash& rhs) const;

private:
    SHA1Hash() = default;
    
    std::array<uint8_t, 20> _hash;
};