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[Wallet] use constant for bip32 hardened key limit

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This commit is contained in:
Jonas Schnelli 2016-06-01 20:29:39 +02:00
parent f19025106d
commit c022e5b15d
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GPG Key ID: 29D4BCB6416F53EC
1 changed files with 8 additions and 4 deletions
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12
src/wallet/wallet.cpp
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@ -42,6 +42,7 @@ bool bSpendZeroConfChange = DEFAULT_SPEND_ZEROCONF_CHANGE;
bool fSendFreeTransactions = DEFAULT_SEND_FREE_TRANSACTIONS;
const char * DEFAULT_WALLET_DAT = "wallet.dat";
const uint32_t BIP32_HARDENED_KEY_LIMIT = 0x80000000;
/**
* Fees smaller than this (in satoshi) are considered zero fee (for transaction creation)
@ -112,16 +113,19 @@ CPubKey CWallet::GenerateNewKey()
masterKey.SetMaster(key.begin(), key.size());
// derive m/0'
// use hardened derivation (child keys > 0x80000000 are hardened after bip32)
masterKey.Derive(accountKey, 0 | 0x80000000);
// use hardened derivation (child keys >= 0x80000000 are hardened after bip32)
masterKey.Derive(accountKey, BIP32_HARDENED_KEY_LIMIT);
// derive m/0'/0'
accountKey.Derive(externalChainChildKey, 0 | 0x80000000);
accountKey.Derive(externalChainChildKey, BIP32_HARDENED_KEY_LIMIT);
// derive child key at next index, skip keys already known to the wallet
do
{
externalChainChildKey.Derive(childKey, hdChain.nExternalChainCounter | 0x80000000);
// always derive hardened keys
// childIndex | BIP32_HARDENED_KEY_LIMIT = derive childIndex in hardened child-index-range
// example: 1 | BIP32_HARDENED_KEY_LIMIT == 0x80000001 == 2147483649
externalChainChildKey.Derive(childKey, hdChain.nExternalChainCounter | BIP32_HARDENED_KEY_LIMIT);
// increment childkey index
hdChain.nExternalChainCounter++;
} while(HaveKey(childKey.key.GetPubKey().GetID()));