dragonx/src/key_io.cpp

// Copyright (c) 2014-2016 The Bitcoin Core developers
// Copyright (c) 2016-2018 The Zcash developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <key_io.h>

#include <base58.h>
#include <bech32.h>
#include <script/script.h>
#include <utilstrencodings.h>

#include <boost/variant/apply_visitor.hpp>
#include <boost/variant/static_visitor.hpp>

#include <assert.h>
#include <string.h>
#include <algorithm>

namespace
{
class DestinationEncoder : public boost::static_visitor<std::string>
{
private:
    const CChainParams& m_params;

public:
    DestinationEncoder(const CChainParams& params) : m_params(params) {}

    std::string operator()(const CKeyID& id) const
    {
        std::vector<unsigned char> data = m_params.Base58Prefix(CChainParams::PUBKEY_ADDRESS);
        data.insert(data.end(), id.begin(), id.end());
        return EncodeBase58Check(data);
    }

    std::string operator()(const CScriptID& id) const
    {
        std::vector<unsigned char> data = m_params.Base58Prefix(CChainParams::SCRIPT_ADDRESS);
        data.insert(data.end(), id.begin(), id.end());
        return EncodeBase58Check(data);
    }

    std::string operator()(const CNoDestination& no) const { return {}; }
};

CTxDestination DecodeDestination(const std::string& str, const CChainParams& params)
{
    std::vector<unsigned char> data;
    uint160 hash;
    if (DecodeBase58Check(str, data)) {
        // base58-encoded Bitcoin addresses.
        // Public-key-hash-addresses have version 0 (or 111 testnet).
        // The data vector contains RIPEMD160(SHA256(pubkey)), where pubkey is the serialized public key.
        const std::vector<unsigned char>& pubkey_prefix = params.Base58Prefix(CChainParams::PUBKEY_ADDRESS);
        if (data.size() == hash.size() + pubkey_prefix.size() && std::equal(pubkey_prefix.begin(), pubkey_prefix.end(), data.begin())) {
            std::copy(data.begin() + pubkey_prefix.size(), data.end(), hash.begin());
            return CKeyID(hash);
        }
        // Script-hash-addresses have version 5 (or 196 testnet).
        // The data vector contains RIPEMD160(SHA256(cscript)), where cscript is the serialized redemption script.
        const std::vector<unsigned char>& script_prefix = params.Base58Prefix(CChainParams::SCRIPT_ADDRESS);
        if (data.size() == hash.size() + script_prefix.size() && std::equal(script_prefix.begin(), script_prefix.end(), data.begin())) {
            std::copy(data.begin() + script_prefix.size(), data.end(), hash.begin());
            return CScriptID(hash);
        }
    }
    return CNoDestination();
}

class PaymentAddressEncoder : public boost::static_visitor<std::string>
{
private:
    const CChainParams& m_params;

public:
    PaymentAddressEncoder(const CChainParams& params) : m_params(params) {}

    std::string operator()(const libzcash::SproutPaymentAddress& zaddr) const
    {
        CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
        ss << zaddr;
        std::vector<unsigned char> data = m_params.Base58Prefix(CChainParams::ZCPAYMENT_ADDRRESS);
        data.insert(data.end(), ss.begin(), ss.end());
        return EncodeBase58Check(data);
    }

    std::string operator()(const libzcash::InvalidEncoding& no) const { return {}; }
};

class ViewingKeyEncoder : public boost::static_visitor<std::string>
{
private:
    const CChainParams& m_params;

public:
    ViewingKeyEncoder(const CChainParams& params) : m_params(params) {}

    std::string operator()(const libzcash::SproutViewingKey& vk) const
    {
        CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
        ss << vk;
        std::vector<unsigned char> data = m_params.Base58Prefix(CChainParams::ZCVIEWING_KEY);
        data.insert(data.end(), ss.begin(), ss.end());
        std::string ret = EncodeBase58Check(data);
        memory_cleanse(data.data(), data.size());
        return ret;
    }

    std::string operator()(const libzcash::InvalidEncoding& no) const { return {}; }
};

class SpendingKeyEncoder : public boost::static_visitor<std::string>
{
private:
    const CChainParams& m_params;

public:
    SpendingKeyEncoder(const CChainParams& params) : m_params(params) {}

    std::string operator()(const libzcash::SproutSpendingKey& zkey) const
    {
        CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
        ss << zkey;
        std::vector<unsigned char> data = m_params.Base58Prefix(CChainParams::ZCSPENDING_KEY);
        data.insert(data.end(), ss.begin(), ss.end());
        std::string ret = EncodeBase58Check(data);
        memory_cleanse(data.data(), data.size());
        return ret;
    }

    std::string operator()(const libzcash::InvalidEncoding& no) const { return {}; }
};
} // namespace

CKey DecodeSecret(const std::string& str)
{
    CKey key;
    std::vector<unsigned char> data;
    if (DecodeBase58Check(str, data)) {
        const std::vector<unsigned char>& privkey_prefix = Params().Base58Prefix(CChainParams::SECRET_KEY);
        if ((data.size() == 32 + privkey_prefix.size() || (data.size() == 33 + privkey_prefix.size() && data.back() == 1)) &&
            std::equal(privkey_prefix.begin(), privkey_prefix.end(), data.begin())) {
            bool compressed = data.size() == 33 + privkey_prefix.size();
            key.Set(data.begin() + privkey_prefix.size(), data.begin() + privkey_prefix.size() + 32, compressed);
        }
    }
    memory_cleanse(data.data(), data.size());
    return key;
}

std::string EncodeSecret(const CKey& key)
{
    assert(key.IsValid());
    std::vector<unsigned char> data = Params().Base58Prefix(CChainParams::SECRET_KEY);
    data.insert(data.end(), key.begin(), key.end());
    if (key.IsCompressed()) {
        data.push_back(1);
    }
    std::string ret = EncodeBase58Check(data);
    memory_cleanse(data.data(), data.size());
    return ret;
}

CExtPubKey DecodeExtPubKey(const std::string& str)
{
    CExtPubKey key;
    std::vector<unsigned char> data;
    if (DecodeBase58Check(str, data)) {
        const std::vector<unsigned char>& prefix = Params().Base58Prefix(CChainParams::EXT_PUBLIC_KEY);
        if (data.size() == BIP32_EXTKEY_SIZE + prefix.size() && std::equal(prefix.begin(), prefix.end(), data.begin())) {
            key.Decode(data.data() + prefix.size());
        }
    }
    return key;
}

std::string EncodeExtPubKey(const CExtPubKey& key)
{
    std::vector<unsigned char> data = Params().Base58Prefix(CChainParams::EXT_PUBLIC_KEY);
    size_t size = data.size();
    data.resize(size + BIP32_EXTKEY_SIZE);
    key.Encode(data.data() + size);
    std::string ret = EncodeBase58Check(data);
    return ret;
}

CExtKey DecodeExtKey(const std::string& str)
{
    CExtKey key;
    std::vector<unsigned char> data;
    if (DecodeBase58Check(str, data)) {
        const std::vector<unsigned char>& prefix = Params().Base58Prefix(CChainParams::EXT_SECRET_KEY);
        if (data.size() == BIP32_EXTKEY_SIZE + prefix.size() && std::equal(prefix.begin(), prefix.end(), data.begin())) {
            key.Decode(data.data() + prefix.size());
        }
    }
    return key;
}

std::string EncodeExtKey(const CExtKey& key)
{
    std::vector<unsigned char> data = Params().Base58Prefix(CChainParams::EXT_SECRET_KEY);
    size_t size = data.size();
    data.resize(size + BIP32_EXTKEY_SIZE);
    key.Encode(data.data() + size);
    std::string ret = EncodeBase58Check(data);
    memory_cleanse(data.data(), data.size());
    return ret;
}

std::string EncodeDestination(const CTxDestination& dest)
{
    return boost::apply_visitor(DestinationEncoder(Params()), dest);
}

CTxDestination DecodeDestination(const std::string& str)
{
    return DecodeDestination(str, Params());
}

bool IsValidDestinationString(const std::string& str, const CChainParams& params)
{
    return IsValidDestination(DecodeDestination(str, params));
}

bool IsValidDestinationString(const std::string& str)
{
    return IsValidDestinationString(str, Params());
}

std::string EncodePaymentAddress(const libzcash::PaymentAddress& zaddr)
{
    return boost::apply_visitor(PaymentAddressEncoder(Params()), zaddr);
}

libzcash::PaymentAddress DecodePaymentAddress(const std::string& str)
{
    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::SerializedPaymentAddressSize + zaddr_prefix.size()) &&
            std::equal(zaddr_prefix.begin(), zaddr_prefix.end(), data.begin())) {
            CSerializeData serialized(data.begin() + zaddr_prefix.size(), data.end());
            CDataStream ss(serialized, SER_NETWORK, PROTOCOL_VERSION);
            libzcash::SproutPaymentAddress ret;
            ss >> ret;
            return ret;
        }
    }
    return libzcash::InvalidEncoding();
}

bool IsValidPaymentAddressString(const std::string& str) {
    return IsValidPaymentAddress(DecodePaymentAddress(str));
}

std::string EncodeViewingKey(const libzcash::ViewingKey& vk)
{
    return boost::apply_visitor(ViewingKeyEncoder(Params()), 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::SerializedViewingKeySize + 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();
}

std::string EncodeSpendingKey(const libzcash::SpendingKey& zkey)
{
    return boost::apply_visitor(SpendingKeyEncoder(Params()), 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::SerializedSpendingKeySize + 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;
        }
    }
    memory_cleanse(data.data(), data.size());
    return libzcash::InvalidEncoding();
}