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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2011 The Bitcoin developers
// Distributed under the MIT/X11 software license, see the accompanying
// file license.txt or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_KEYSTORE_H
#define BITCOIN_KEYSTORE_H
#include "crypter.h"
// A virtual base class for key stores
class CKeyStore
{
protected:
mutable CCriticalSection cs_KeyStore;
public:
virtual ~CKeyStore() {}
// Add a key to the store.
virtual bool AddKey(const CKey& key) =0;
// Check whether a key corresponding to a given address is present in the store.
virtual bool HaveKey(const CBitcoinAddress &address) const =0;
// Retrieve a key corresponding to a given address from the store.
// Return true if succesful.
virtual bool GetKey(const CBitcoinAddress &address, CKey& keyOut) const =0;
// Retrieve only the public key corresponding to a given address.
// This may succeed even if GetKey fails (e.g., encrypted wallets)
virtual bool GetPubKey(const CBitcoinAddress &address, std::vector<unsigned char>& vchPubKeyOut) const;
// Generate a new key, and add it to the store
virtual std::vector<unsigned char> GenerateNewKey();
};
typedef std::map<CBitcoinAddress, CSecret> KeyMap;
// Basic key store, that keeps keys in an address->secret map
class CBasicKeyStore : public CKeyStore
{
protected:
KeyMap mapKeys;
public:
bool AddKey(const CKey& key);
bool HaveKey(const CBitcoinAddress &address) const
{
bool result;
CRITICAL_BLOCK(cs_KeyStore)
result = (mapKeys.count(address) > 0);
return result;
}
bool GetKey(const CBitcoinAddress &address, CKey& keyOut) const
{
CRITICAL_BLOCK(cs_KeyStore)
{
KeyMap::const_iterator mi = mapKeys.find(address);
if (mi != mapKeys.end())
{
keyOut.SetSecret((*mi).second);
return true;
}
}
return false;
}
};
typedef std::map<CBitcoinAddress, std::pair<std::vector<unsigned char>, std::vector<unsigned char> > > CryptedKeyMap;
// Keystore which keeps the private keys encrypted
// It derives from the basic key store, which is used if no encryption is active.
class CCryptoKeyStore : public CBasicKeyStore
{
private:
CryptedKeyMap mapCryptedKeys;
CKeyingMaterial vMasterKey;
// if fUseCrypto is true, mapKeys must be empty
// if fUseCrypto is false, vMasterKey must be empty
bool fUseCrypto;
protected:
bool SetCrypted();
// will encrypt previously unencrypted keys
bool EncryptKeys(CKeyingMaterial& vMasterKeyIn);
bool Unlock(const CKeyingMaterial& vMasterKeyIn);
public:
CCryptoKeyStore() : fUseCrypto(false)
{
}
bool IsCrypted() const
{
return fUseCrypto;
}
bool IsLocked() const
{
if (!IsCrypted())
return false;
bool result;
CRITICAL_BLOCK(cs_KeyStore)
result = vMasterKey.empty();
return result;
}
bool Lock()
{
if (!SetCrypted())
return false;
CRITICAL_BLOCK(cs_KeyStore)
vMasterKey.clear();
return true;
}
virtual bool AddCryptedKey(const std::vector<unsigned char> &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret);
std::vector<unsigned char> GenerateNewKey();
bool AddKey(const CKey& key);
bool HaveKey(const CBitcoinAddress &address) const
{
CRITICAL_BLOCK(cs_KeyStore)
{
if (!IsCrypted())
return CBasicKeyStore::HaveKey(address);
return mapCryptedKeys.count(address) > 0;
}
return false;
}
bool GetKey(const CBitcoinAddress &address, CKey& keyOut) const;
bool GetPubKey(const CBitcoinAddress &address, std::vector<unsigned char>& vchPubKeyOut) const;
};
#endif
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