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author | Jonas Schnelli <dev@jonasschnelli.ch> | 2016-01-02 12:34:08 +0100 |
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committer | Jonas Schnelli <dev@jonasschnelli.ch> | 2016-05-31 14:47:00 +0200 |
commit | f19025106de47a92396f9fb98e6d3bbc568c40b5 (patch) | |
tree | 54d64f8e6aad10ec6866e5f25cad88d65dd3b4ab /src/wallet | |
parent | 950be19727a581970591d8f8138dfe4725750382 (diff) | |
download | bitcoin-f19025106de47a92396f9fb98e6d3bbc568c40b5.tar.xz |
[Wallet] Add simplest BIP32/deterministic key generation implementation
Diffstat (limited to 'src/wallet')
-rw-r--r-- | src/wallet/wallet.cpp | 86 | ||||
-rw-r--r-- | src/wallet/wallet.h | 12 | ||||
-rw-r--r-- | src/wallet/walletdb.cpp | 17 | ||||
-rw-r--r-- | src/wallet/walletdb.h | 32 |
4 files changed, 143 insertions, 4 deletions
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp index da0d6f272b..fdb46472a8 100644 --- a/src/wallet/wallet.cpp +++ b/src/wallet/wallet.cpp @@ -91,7 +91,48 @@ CPubKey CWallet::GenerateNewKey() bool fCompressed = CanSupportFeature(FEATURE_COMPRPUBKEY); // default to compressed public keys if we want 0.6.0 wallets CKey secret; - secret.MakeNewKey(fCompressed); + + // Create new metadata + int64_t nCreationTime = GetTime(); + CKeyMetadata metadata(nCreationTime); + + // use HD key derivation if HD was enabled during wallet creation + if (!hdChain.masterKeyID.IsNull()) { + // for now we use a fixed keypath scheme of m/0'/0'/k + CKey key; //master key seed (256bit) + CExtKey masterKey; //hd master key + CExtKey accountKey; //key at m/0' + CExtKey externalChainChildKey; //key at m/0'/0' + CExtKey childKey; //key at m/0'/0'/<n>' + + // try to get the master key + if (!GetKey(hdChain.masterKeyID, key)) + throw std::runtime_error("CWallet::GenerateNewKey(): Master key not found"); + + masterKey.SetMaster(key.begin(), key.size()); + + // derive m/0' + // use hardened derivation (child keys > 0x80000000 are hardened after bip32) + masterKey.Derive(accountKey, 0 | 0x80000000); + + // derive m/0'/0' + accountKey.Derive(externalChainChildKey, 0 | 0x80000000); + + // derive child key at next index, skip keys already known to the wallet + do + { + externalChainChildKey.Derive(childKey, hdChain.nExternalChainCounter | 0x80000000); + // increment childkey index + hdChain.nExternalChainCounter++; + } while(HaveKey(childKey.key.GetPubKey().GetID())); + secret = childKey.key; + + // update the chain model in the database + if (!CWalletDB(strWalletFile).WriteHDChain(hdChain)) + throw std::runtime_error("CWallet::GenerateNewKey(): Writing HD chain model failed"); + } else { + secret.MakeNewKey(fCompressed); + } // Compressed public keys were introduced in version 0.6.0 if (fCompressed) @@ -100,9 +141,7 @@ CPubKey CWallet::GenerateNewKey() CPubKey pubkey = secret.GetPubKey(); assert(secret.VerifyPubKey(pubkey)); - // Create new metadata - int64_t nCreationTime = GetTime(); - mapKeyMetadata[pubkey.GetID()] = CKeyMetadata(nCreationTime); + mapKeyMetadata[pubkey.GetID()] = metadata; if (!nTimeFirstKey || nCreationTime < nTimeFirstKey) nTimeFirstKey = nCreationTime; @@ -1049,6 +1088,37 @@ CAmount CWallet::GetChange(const CTransaction& tx) const return nChange; } +bool CWallet::SetHDMasterKey(const CKey& key) +{ + LOCK(cs_wallet); + + // store the key as normal "key"/"ckey" object + // in the database + // key metadata is not required + CPubKey pubkey = key.GetPubKey(); + if (!AddKeyPubKey(key, pubkey)) + throw std::runtime_error("CWallet::GenerateNewKey(): AddKey failed"); + + // store the keyid (hash160) together with + // the child index counter in the database + // as a hdchain object + CHDChain newHdChain; + newHdChain.masterKeyID = pubkey.GetID(); + SetHDChain(newHdChain, false); + + return true; +} + +bool CWallet::SetHDChain(const CHDChain& chain, bool memonly) +{ + LOCK(cs_wallet); + if (!memonly && !CWalletDB(strWalletFile).WriteHDChain(chain)) + throw runtime_error("AddHDChain(): writing chain failed"); + + hdChain = chain; + return true; +} + int64_t CWalletTx::GetTxTime() const { int64_t n = nTimeSmart; @@ -3058,6 +3128,7 @@ std::string CWallet::GetWalletHelpString(bool showDebug) strUsage += HelpMessageOpt("-sendfreetransactions", strprintf(_("Send transactions as zero-fee transactions if possible (default: %u)"), DEFAULT_SEND_FREE_TRANSACTIONS)); strUsage += HelpMessageOpt("-spendzeroconfchange", strprintf(_("Spend unconfirmed change when sending transactions (default: %u)"), DEFAULT_SPEND_ZEROCONF_CHANGE)); strUsage += HelpMessageOpt("-txconfirmtarget=<n>", strprintf(_("If paytxfee is not set, include enough fee so transactions begin confirmation on average within n blocks (default: %u)"), DEFAULT_TX_CONFIRM_TARGET)); + strUsage += HelpMessageOpt("-usehd", _("Use hierarchical deterministic key generation (HD) after bip32. Only has effect during wallet creation/first start") + " " + strprintf(_("(default: %u)"), DEFAULT_USE_HD_WALLET)); strUsage += HelpMessageOpt("-upgradewallet", _("Upgrade wallet to latest format on startup")); strUsage += HelpMessageOpt("-wallet=<file>", _("Specify wallet file (within data directory)") + " " + strprintf(_("(default: %s)"), DEFAULT_WALLET_DAT)); strUsage += HelpMessageOpt("-walletbroadcast", _("Make the wallet broadcast transactions") + " " + strprintf(_("(default: %u)"), DEFAULT_WALLETBROADCAST)); @@ -3145,6 +3216,13 @@ bool CWallet::InitLoadWallet() if (fFirstRun) { // Create new keyUser and set as default key + if (GetBoolArg("-usehd", DEFAULT_USE_HD_WALLET)) { + // generate a new master key + CKey key; + key.MakeNewKey(true); + if (!walletInstance->SetHDMasterKey(key)) + throw std::runtime_error("CWallet::GenerateNewKey(): Storing master key failed"); + } CPubKey newDefaultKey; if (walletInstance->GetKeyFromPool(newDefaultKey)) { walletInstance->SetDefaultKey(newDefaultKey); diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h index b2180a5a26..a819c03266 100644 --- a/src/wallet/wallet.h +++ b/src/wallet/wallet.h @@ -57,6 +57,9 @@ static const unsigned int DEFAULT_TX_CONFIRM_TARGET = 2; static const unsigned int MAX_FREE_TRANSACTION_CREATE_SIZE = 1000; static const bool DEFAULT_WALLETBROADCAST = true; +//! if set, all keys will be derived by using BIP32 +static const bool DEFAULT_USE_HD_WALLET = true; + extern const char * DEFAULT_WALLET_DAT; class CBlockIndex; @@ -574,6 +577,9 @@ private: void SyncMetaData(std::pair<TxSpends::iterator, TxSpends::iterator>); + /* the hd chain data model (external chain counters) */ + CHDChain hdChain; + public: /* * Main wallet lock. @@ -887,6 +893,12 @@ public: static bool ParameterInteraction(); bool BackupWallet(const std::string& strDest); + + /* Set the hd chain model (chain child index counters) */ + bool SetHDChain(const CHDChain& chain, bool memonly); + + /* Set the current hd master key (will reset the chain child index counters) */ + bool SetHDMasterKey(const CKey& key); }; /** A key allocated from the key pool. */ diff --git a/src/wallet/walletdb.cpp b/src/wallet/walletdb.cpp index b5037c9a65..7bfd490950 100644 --- a/src/wallet/walletdb.cpp +++ b/src/wallet/walletdb.cpp @@ -599,6 +599,16 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue, return false; } } + else if (strType == "hdchain") + { + CHDChain chain; + ssValue >> chain; + if (!pwallet->SetHDChain(chain, true)) + { + strErr = "Error reading wallet database: SetHDChain failed"; + return false; + } + } } catch (...) { return false; @@ -1003,3 +1013,10 @@ bool CWalletDB::EraseDestData(const std::string &address, const std::string &key nWalletDBUpdated++; return Erase(std::make_pair(std::string("destdata"), std::make_pair(address, key))); } + + +bool CWalletDB::WriteHDChain(const CHDChain& chain) +{ + nWalletDBUpdated++; + return Write(std::string("hdchain"), chain); +} diff --git a/src/wallet/walletdb.h b/src/wallet/walletdb.h index 00c10ea70f..71b0ff26db 100644 --- a/src/wallet/walletdb.h +++ b/src/wallet/walletdb.h @@ -40,6 +40,35 @@ enum DBErrors DB_NEED_REWRITE }; +/* simple hd chain data model */ +class CHDChain +{ +public: + uint32_t nExternalChainCounter; + CKeyID masterKeyID; //!< master key hash160 + + static const int CURRENT_VERSION = 1; + int nVersion; + + CHDChain() { SetNull(); } + ADD_SERIALIZE_METHODS; + template <typename Stream, typename Operation> + inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) + { + READWRITE(this->nVersion); + nVersion = this->nVersion; + READWRITE(nExternalChainCounter); + READWRITE(masterKeyID); + } + + void SetNull() + { + nVersion = CHDChain::CURRENT_VERSION; + nExternalChainCounter = 0; + masterKeyID.SetNull(); + } +}; + class CKeyMetadata { public: @@ -134,6 +163,9 @@ public: static bool Recover(CDBEnv& dbenv, const std::string& filename, bool fOnlyKeys); static bool Recover(CDBEnv& dbenv, const std::string& filename); + //! write the hdchain model (external chain child index counter) + bool WriteHDChain(const CHDChain& chain); + private: CWalletDB(const CWalletDB&); void operator=(const CWalletDB&); |