key.h

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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2014 The Bitcoin developers
// Copyright (c) 2015-2018 The PIVX developers
// Copyright (c) 2018-2020 The DAPS Project 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 "allocators.h"
#include "serialize.h"
#include "uint256.h"
 
#include <stdexcept>
#include <vector>
 
class CPubKey;
 
struct CExtPubKey;
 
typedef std::vector<unsigned char, secure_allocator<unsigned char> > CPrivKey;
 
class CKey
{
private:
    bool fValid;
 
    bool fCompressed;
 
    unsigned char vch[32];
 
    bool static Check(const unsigned char* vch);
 
public:
    CKey() : fValid(false), fCompressed(false)
    {
        LockObject(vch);
    }
 
    CKey(const CKey& secret) : fValid(secret.fValid), fCompressed(secret.fCompressed)
    {
        LockObject(vch);
        memcpy(vch, secret.vch, sizeof(vch));
    }
 
    ~CKey()
    {
        UnlockObject(vch);
    }
 
    friend bool operator==(const CKey& a, const CKey& b)
    {
        return a.fCompressed == b.fCompressed && a.size() == b.size() &&
               memcmp(&a.vch[0], &b.vch[0], a.size()) == 0;
    }
 
    template <typename T>
    void Set(const T pbegin, const T pend, bool fCompressedIn)
    {
        if (pend - pbegin != 32) {
            fValid = false;
            return;
        }
        if (Check(&pbegin[0])) {
            memcpy(vch, (unsigned char*)&pbegin[0], 32);
            fValid = true;
            fCompressed = fCompressedIn;
        } else {
            fValid = false;
        }
    }
 
    unsigned int size() const { return (fValid ? 32 : 0); }
    const unsigned char* begin() const { return vch; }
    const unsigned char* end() const { return vch + size(); }
 
    bool IsValid() const { return fValid; }
 
    bool IsCompressed() const { return fCompressed; }
 
    bool SetPrivKey(const CPrivKey& vchPrivKey, bool fCompressed);
 
    void MakeNewKey(bool fCompressed);
 
    uint256 GetPrivKey_256();
 
    CPrivKey GetPrivKey() const;
 
    CPubKey GetPubKey() const;
 
    bool Sign(const uint256& hash, std::vector<unsigned char>& vchSig, uint32_t test_case = 0) const;
 
    bool SignCompact(const uint256& hash, std::vector<unsigned char>& vchSig) const;
 
    bool Derive(CKey& keyChild, unsigned char ccChild[32], unsigned int nChild, const unsigned char cc[32]) const;
 
    bool VerifyPubKey(const CPubKey& vchPubKey) const;
 
    bool Load(CPrivKey& privkey, CPubKey& vchPubKey, bool fSkipCheck);
 
    static bool CheckSignatureElement(const unsigned char* vch, int len, bool half);
};
 
struct CExtKey {
    unsigned char nDepth;
    unsigned char vchFingerprint[4];
    unsigned int nChild;
    unsigned char vchChainCode[32];
    CKey key;
 
    friend bool operator==(const CExtKey& a, const CExtKey& b)
    {
        return a.nDepth == b.nDepth && memcmp(&a.vchFingerprint[0], &b.vchFingerprint[0], 4) == 0 && a.nChild == b.nChild &&
               memcmp(&a.vchChainCode[0], &b.vchChainCode[0], 32) == 0 && a.key == b.key;
    }
 
    void Encode(unsigned char code[74]) const;
    void Decode(const unsigned char code[74]);
    bool Derive(CExtKey& out, unsigned int nChild) const;
    CExtPubKey Neuter() const;
    void SetMaster(const unsigned char* seed, unsigned int nSeedLen);
};
 
bool ECC_InitSanityCheck(void);
 
#endif // BITCOIN_KEY_H