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Auto merge of #4328 - oxarbitrage:issue3344, r=str4d 

Reduce duplication in key_io decode

Attempt to fix https://github.com/zcash/zcash/issues/3344 by adding a new `DecodeAny` template function with arguments that will handle all the cases. Then on each decoding this new function is called with the appropriate arguments resulting in reducing code duplication.

Some of the complexity(`boost::optional`) will be removed if `ViewingKey` is implemented for sapling.
This commit is contained in:
Homu 2020-02-17 21:50:45 +00:00
parent a830563309 0987bf349a
commit 5dde1a7702
1 changed files with 54 additions and 63 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

117
src/key_io.cpp
View File

@ -270,36 +270,59 @@ std::string EncodePaymentAddress(const libzcash::PaymentAddress& zaddr)
return boost::apply_visitor(PaymentAddressEncoder(Params()), zaddr);
}
libzcash::PaymentAddress DecodePaymentAddress(const std::string& str)
template<typename T1, typename T2, typename T3 = T2>
T1 DecodeAny(
const std::string& str,
std::pair<CChainParams::Base58Type, size_t> sprout,
boost::optional<std::pair<CChainParams::Bech32Type, size_t>> sapling)
{
std::vector<unsigned char> data;
if (DecodeBase58Check(str, data)) {
const std::vector<unsigned char>& zaddr_prefix = Params().Base58Prefix(CChainParams::ZCPAYMENT_ADDRRESS);
if ((data.size() == libzcash::SerializedSproutPaymentAddressSize + zaddr_prefix.size()) &&
std::equal(zaddr_prefix.begin(), zaddr_prefix.end(), data.begin())) {
CSerializeData serialized(data.begin() + zaddr_prefix.size(), data.end());
const std::vector<unsigned char>& prefix = Params().Base58Prefix(sprout.first);
if ((data.size() == sprout.second + prefix.size()) &&
std::equal(prefix.begin(), prefix.end(), data.begin())) {
CSerializeData serialized(data.begin() + prefix.size(), data.end());
CDataStream ss(serialized, SER_NETWORK, PROTOCOL_VERSION);
libzcash::SproutPaymentAddress ret;
T2 ret;
ss >> ret;
memory_cleanse(serialized.data(), serialized.size());
memory_cleanse(data.data(), data.size());
return ret;
}
}
data.clear();
auto bech = bech32::Decode(str);
if (bech.first == Params().Bech32HRP(CChainParams::SAPLING_PAYMENT_ADDRESS) &&
bech.second.size() == ConvertedSaplingPaymentAddressSize) {
// Bech32 decoding
data.reserve((bech.second.size() * 5) / 8);
if (ConvertBits<5, 8, false>([&](unsigned char c) { data.push_back(c); }, bech.second.begin(), bech.second.end())) {
CDataStream ss(data, SER_NETWORK, PROTOCOL_VERSION);
libzcash::SaplingPaymentAddress ret;
ss >> ret;
return ret;
if (sapling) {
data.clear();
auto bech = bech32::Decode(str);
if (bech.first == Params().Bech32HRP(sapling.get().first) &&
bech.second.size() == sapling.get().second) {
// Bech32 decoding
data.reserve((bech.second.size() * 5) / 8);
if (ConvertBits<5, 8, false>([&](unsigned char c) { data.push_back(c); }, bech.second.begin(), bech.second.end())) {
CDataStream ss(data, SER_NETWORK, PROTOCOL_VERSION);
T3 ret;
ss >> ret;
memory_cleanse(data.data(), data.size());
return ret;
}
}
}
memory_cleanse(data.data(), data.size());
return libzcash::InvalidEncoding();
}
libzcash::PaymentAddress DecodePaymentAddress(const std::string& str)
{
return DecodeAny<libzcash::PaymentAddress,
libzcash::SproutPaymentAddress,
libzcash::SaplingPaymentAddress>(
str,
std::make_pair(CChainParams::ZCPAYMENT_ADDRRESS, libzcash::SerializedSproutPaymentAddressSize),
std::make_pair(CChainParams::SAPLING_PAYMENT_ADDRESS, ConvertedSaplingPaymentAddressSize)
);
}
bool IsValidPaymentAddressString(const std::string& str) {
return IsValidPaymentAddress(DecodePaymentAddress(str));
}
@ -311,22 +334,12 @@ std::string EncodeViewingKey(const libzcash::ViewingKey& vk)
libzcash::ViewingKey DecodeViewingKey(const std::string& str)
{
std::vector<unsigned char> data;
if (DecodeBase58Check(str, data)) {
const std::vector<unsigned char>& vk_prefix = Params().Base58Prefix(CChainParams::ZCVIEWING_KEY);
if ((data.size() == libzcash::SerializedSproutViewingKeySize + vk_prefix.size()) &&
std::equal(vk_prefix.begin(), vk_prefix.end(), data.begin())) {
CSerializeData serialized(data.begin() + vk_prefix.size(), data.end());
CDataStream ss(serialized, SER_NETWORK, PROTOCOL_VERSION);
libzcash::SproutViewingKey ret;
ss >> ret;
memory_cleanse(serialized.data(), serialized.size());
memory_cleanse(data.data(), data.size());
return ret;
}
}
memory_cleanse(data.data(), data.size());
return libzcash::InvalidEncoding();
return DecodeAny<libzcash::ViewingKey,
libzcash::SproutViewingKey>(
str,
std::make_pair(CChainParams::ZCVIEWING_KEY, libzcash::SerializedSproutViewingKeySize),
boost::none
);
}
std::string EncodeSpendingKey(const libzcash::SpendingKey& zkey)
@ -336,34 +349,12 @@ std::string EncodeSpendingKey(const libzcash::SpendingKey& zkey)
libzcash::SpendingKey DecodeSpendingKey(const std::string& str)
{
std::vector<unsigned char> data;
if (DecodeBase58Check(str, data)) {
const std::vector<unsigned char>& zkey_prefix = Params().Base58Prefix(CChainParams::ZCSPENDING_KEY);
if ((data.size() == libzcash::SerializedSproutSpendingKeySize + zkey_prefix.size()) &&
std::equal(zkey_prefix.begin(), zkey_prefix.end(), data.begin())) {
CSerializeData serialized(data.begin() + zkey_prefix.size(), data.end());
CDataStream ss(serialized, SER_NETWORK, PROTOCOL_VERSION);
libzcash::SproutSpendingKey ret;
ss >> ret;
memory_cleanse(serialized.data(), serialized.size());
memory_cleanse(data.data(), data.size());
return ret;
}
}
data.clear();
auto bech = bech32::Decode(str);
if (bech.first == Params().Bech32HRP(CChainParams::SAPLING_EXTENDED_SPEND_KEY) &&
bech.second.size() == ConvertedSaplingExtendedSpendingKeySize) {
// Bech32 decoding
data.reserve((bech.second.size() * 5) / 8);
if (ConvertBits<5, 8, false>([&](unsigned char c) { data.push_back(c); }, bech.second.begin(), bech.second.end())) {
CDataStream ss(data, SER_NETWORK, PROTOCOL_VERSION);
libzcash::SaplingExtendedSpendingKey ret;
ss >> ret;
memory_cleanse(data.data(), data.size());
return ret;
}
}
memory_cleanse(data.data(), data.size());
return libzcash::InvalidEncoding();
return DecodeAny<libzcash::SpendingKey,
libzcash::SproutSpendingKey,
libzcash::SaplingExtendedSpendingKey>(
str,
std::make_pair(CChainParams::ZCSPENDING_KEY, libzcash::SerializedSproutSpendingKeySize),
std::make_pair(CChainParams::SAPLING_EXTENDED_SPEND_KEY, ConvertedSaplingExtendedSpendingKeySize)
);
}