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[Wallet] extend CKeyMetadata with HD keypath 

Zcash: modified for zip32
This commit is contained in:
Jonas Schnelli 2016-07-09 11:41:01 +02:00 committed by Eirik Ogilvie-Wigley
parent 9bcf90e2de
commit b6d1af89f2
2 changed files with 16 additions and 2 deletions
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5
src/wallet/wallet.cpp
View File

@ -117,18 +117,21 @@ SaplingPaymentAddress CWallet::GenerateNewSaplingZKey()
throw std::runtime_error("CWallet::GenerateNewSaplingZKey(): HD seed not found");
auto m = libzcash::SaplingExtendedSpendingKey::Master(seed);
uint32_t bip44CoinType = Params().BIP44CoinType();
// We use a fixed keypath scheme of m/32'/coin_type'/account'
// Derive m/32'
auto m_32h = m.Derive(32 | ZIP32_HARDENED_KEY_LIMIT);
// Derive m/32'/coin_type'
auto m_32h_cth = m_32h.Derive(Params().BIP44CoinType() | ZIP32_HARDENED_KEY_LIMIT);
auto m_32h_cth = m_32h.Derive(bip44CoinType | ZIP32_HARDENED_KEY_LIMIT);
// Derive account key at next index, skip keys already known to the wallet
libzcash::SaplingExtendedSpendingKey xsk;
do
{
xsk = m_32h_cth.Derive(hdChain.saplingAccountCounter | ZIP32_HARDENED_KEY_LIMIT);
metadata.hdKeypath = "m/32'/" + std::to_string(bip44CoinType) + "'/" + std::to_string(hdChain.saplingAccountCounter) + "'";
metadata.seedFp = hdChain.seedFp;
// Increment childkey index
hdChain.saplingAccountCounter++;
} while (HaveSaplingSpendingKey(xsk.expsk.full_viewing_key()));

13
src/wallet/walletdb.h
View File

@ -77,9 +77,13 @@ public:
class CKeyMetadata
{
public:
static const int CURRENT_VERSION=1;
static const int VERSION_BASIC=1;
static const int VERSION_WITH_HDDATA=10;
static const int CURRENT_VERSION=VERSION_WITH_HDDATA;
int nVersion;
int64_t nCreateTime; // 0 means unknown
std::string hdKeypath; //optional HD/zip32 keypath
uint256 seedFp;
CKeyMetadata()
{
@ -89,6 +93,7 @@ public:
{
nVersion = CKeyMetadata::CURRENT_VERSION;
nCreateTime = nCreateTime_;
hdKeypath.clear();
}
ADD_SERIALIZE_METHODS;
@ -97,12 +102,18 @@ public:
inline void SerializationOp(Stream& s, Operation ser_action) {
READWRITE(this->nVersion);
READWRITE(nCreateTime);
if (this->nVersion >= VERSION_WITH_HDDATA)
{
READWRITE(hdKeypath);
READWRITE(seedFp);
}
}
void SetNull()
{
nVersion = CKeyMetadata::CURRENT_VERSION;
nCreateTime = 0;
hdKeypath.clear();
}
};