Class CKey

src/key.h:26–164

An encapsulated private key. */

/** An encapsulated private key. */
class CKey
{
public:
    /**
     * secp256k1:
     */
    static const unsigned int SIZE            = 279;
    static const unsigned int COMPRESSED_SIZE = 214;
    /**
     * see www.keylength.com
     * script supports up to 75 for single byte push
     */
    static_assert(
        SIZE >= COMPRESSED_SIZE,
        "COMPRESSED_SIZE is larger than SIZE");

private:
    //! Whether this private key is valid. We check for correctness when modifying the key
    //! data, so fValid should always correspond to the actual state.
    bool fValid;

    //! Whether the public key corresponding to this private key is (to be) compressed.
    bool fCompressed;

    //! The actual byte data
    std::vector<unsigned char, secure_allocator<unsigned char> > keydata;

    //! Check whether the 32-byte array pointed to by vch is valid keydata.
    bool static Check(const unsigned char* vch);

public:
    //! Construct an invalid private key.
    CKey() : fValid(false), fCompressed(false)
    {
        // Important: vch must be 32 bytes in length to not break serialization
        keydata.resize(32);
    }

    friend bool operator==(const CKey& a, const CKey& b)
    {
        return a.fCompressed == b.fCompressed &&
            a.size() == b.size() &&
            memcmp(a.keydata.data(), b.keydata.data(), a.size()) == 0;
    }

    //! Initialize using begin and end iterators to byte data.
    template <typename T>
    void Set(const T pbegin, const T pend, bool fCompressedIn)
    {
        if (size_t(pend - pbegin) != keydata.size()) {
            fValid = false;
        } else if (Check(&pbegin[0])) {
            memcpy(keydata.data(), (unsigned char*)&pbegin[0], keydata.size());
            fValid = true;
            fCompressed = fCompressedIn;
        } else {
            fValid = false;
        }