key.h

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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2018 The Bitcoin Core developers
// Copyright (c) 2017 The Zcash developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#ifndef BITCOIN_KEY_H
#define BITCOIN_KEY_H

#include <pubkey.h>
#include <serialize.h>
#include <support/allocators/secure.h>
#include <uint256.h>

#include <stdexcept>
#include <vector>


typedef std::vector<unsigned char, secure_allocator<unsigned char> > CPrivKey;

class CKey
{
public:
    static const unsigned int PRIVATE_KEY_SIZE            = 279;
    static const unsigned int COMPRESSED_PRIVATE_KEY_SIZE = 214;
    static_assert(
        PRIVATE_KEY_SIZE >= COMPRESSED_PRIVATE_KEY_SIZE,
        "COMPRESSED_PRIVATE_KEY_SIZE is larger than PRIVATE_KEY_SIZE");

private:
    bool fValid;

    bool fCompressed;

    std::vector<unsigned char, secure_allocator<unsigned char> > keydata;

    bool static Check(const unsigned char* vch);

public:
    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;
    }

    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;
        }
    }

    unsigned int size() const { return (fValid ? keydata.size() : 0); }
    const unsigned char* begin() const { return keydata.data(); }
    const unsigned char* end() const { return keydata.data() + size(); }

    bool IsValid() const { return fValid; }

    bool IsCompressed() const { return fCompressed; }

    void MakeNewKey(bool fCompressed);

    bool Negate();

    CPrivKey GetPrivKey() const;

    CPubKey GetPubKey() const;

    bool Sign(const uint256& hash, std::vector<unsigned char>& vchSig, bool grind = true, uint32_t test_case = 0) const;

    bool SignCompact(const uint256& hash, std::vector<unsigned char>& vchSig) const;

    bool Derive(CKey& keyChild, ChainCode &ccChild, unsigned int nChild, const ChainCode& cc) const;

    bool VerifyPubKey(const CPubKey& vchPubKey) const;

    bool Load(const CPrivKey& privkey, const CPubKey& vchPubKey, bool fSkipCheck);
};

struct CExtKey {
    unsigned char nDepth;
    unsigned char vchFingerprint[4];
    unsigned int nChild;
    ChainCode chaincode;
    CKey key;

    friend bool operator==(const CExtKey& a, const CExtKey& b)
    {
        return a.nDepth == b.nDepth &&
            memcmp(&a.vchFingerprint[0], &b.vchFingerprint[0], sizeof(vchFingerprint)) == 0 &&
            a.nChild == b.nChild &&
            a.chaincode == b.chaincode &&
            a.key == b.key;
    }

    void Encode(unsigned char code[BIP32_EXTKEY_SIZE]) const;
    void Decode(const unsigned char code[BIP32_EXTKEY_SIZE]);
    bool Derive(CExtKey& out, unsigned int nChild) const;
    CExtPubKey Neuter() const;
    void SetSeed(const unsigned char* seed, unsigned int nSeedLen);
    template <typename Stream>
    void Serialize(Stream& s) const
    {
        unsigned int len = BIP32_EXTKEY_SIZE;
        ::WriteCompactSize(s, len);
        unsigned char code[BIP32_EXTKEY_SIZE];
        Encode(code);
        s.write((const char *)&code[0], len);
    }
    template <typename Stream>
    void Unserialize(Stream& s)
    {
        unsigned int len = ::ReadCompactSize(s);
        unsigned char code[BIP32_EXTKEY_SIZE];
        if (len != BIP32_EXTKEY_SIZE)
            throw std::runtime_error("Invalid extended key size\n");
        s.read((char *)&code[0], len);
        Decode(code);
    }
};

void ECC_Start();

void ECC_Stop();

bool ECC_InitSanityCheck();

#endif // BITCOIN_KEY_H