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Add derivation helpers for peg-out wallet infrastructure

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This commit is contained in:
Gregory Sanders 2018-12-17 13:36:41 -05:00
parent 1559cc9c3b
commit 4e631bd778
1 changed files with 58 additions and 0 deletions
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58
src/wallet/rpcwallet.cpp
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@ -4910,6 +4910,64 @@ UniValue getpeginaddress(const JSONRPCRequest& request)
return fundinginfo; return fundinginfo;
} }
//! Derive BIP32 tweak from master xpub to child pubkey.
bool DerivePubTweak(const std::vector<uint32_t>& vPath, const CPubKey& keyMaster, const ChainCode &ccMaster, std::vector<unsigned char>& tweakSum)
{
tweakSum.clear();
tweakSum.resize(32);
std::vector<unsigned char> tweak;
CPubKey keyParent = keyMaster;
CPubKey keyChild;
ChainCode ccChild;
ChainCode ccParent = ccMaster;
for (unsigned int i = 0; i < vPath.size(); i++) {
if ((vPath[i] >> 31) != 0) {
return false;
}
keyParent.Derive(keyChild, ccChild, vPath[i], ccParent, &tweak);
assert(tweak.size() == 32);
ccParent = ccChild;
keyParent = keyChild;
bool ret = secp256k1_ec_privkey_tweak_add(secp256k1_ctx, tweakSum.data(), tweak.data());
if (!ret) {
return false;
}
}
return true;
}
CTxDestination DeriveBitcoinOfflineAddress(const CExtPubKey& xpub, const uint32_t counter)
{
std::vector<uint32_t> vPath;
vPath.push_back(0);
vPath.push_back(counter);
std::vector<unsigned char> tweakSum;
if (!DerivePubTweak(vPath, xpub.pubkey, xpub.chaincode, tweakSum)) {
throw JSONRPCError(RPC_INVALID_PARAMETER, "Could not derive the pubkey tweak for given counter and xpub.");
}
secp256k1_pubkey masterpub_secp;
int ret = secp256k1_ec_pubkey_parse(secp256k1_ctx, &masterpub_secp, xpub.pubkey.begin(), xpub.pubkey.size());
if (ret != 1) {
throw JSONRPCError(RPC_WALLET_ERROR, "Master pubkey could not be parsed.");
}
ret = secp256k1_ec_pubkey_tweak_add(secp256k1_ctx, &masterpub_secp, tweakSum.data());
assert(ret);
std::vector<unsigned char> btcpubkeybytes;
btcpubkeybytes.resize(33);
size_t btclen = 33;
ret = secp256k1_ec_pubkey_serialize(secp256k1_ctx, &btcpubkeybytes[0], &btclen, &masterpub_secp, SECP256K1_EC_COMPRESSED);
assert(ret == 1);
assert(btclen == 33);
assert(btcpubkeybytes.size() == 33);
CPubKey btcpub(btcpubkeybytes);
return CTxDestination(btcpub.GetID());
}
UniValue sendtomainchain(const JSONRPCRequest& request) UniValue sendtomainchain(const JSONRPCRequest& request)
{ {
std::shared_ptr<CWallet> const wallet = GetWalletForJSONRPCRequest(request); std::shared_ptr<CWallet> const wallet = GetWalletForJSONRPCRequest(request);