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// Copyright (c) 2014-2018 The Bitcoin Core 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 <util/strencodings.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:
explicit DestinationEncoder(const CChainParams& params) : m_params(params) {}
std::string operator()(const PKHash& 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 ScriptHash& 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 WitnessV0KeyHash& id) const
{
std::vector<unsigned char> data = {0};
data.reserve(33);
ConvertBits<8, 5, true>([&](unsigned char c) { data.push_back(c); }, id.begin(), id.end());
return bech32::Encode(m_params.Bech32HRP(), data);
}
std::string operator()(const WitnessV0ScriptHash& id) const
{
std::vector<unsigned char> data = {0};
data.reserve(53);
ConvertBits<8, 5, true>([&](unsigned char c) { data.push_back(c); }, id.begin(), id.end());
return bech32::Encode(m_params.Bech32HRP(), data);
}
std::string operator()(const WitnessUnknown& id) const
{
if (id.version < 1 || id.version > 16 || id.length < 2 || id.length > 40) {
return {};
}
std::vector<unsigned char> data = {(unsigned char)id.version};
data.reserve(1 + (id.length * 8 + 4) / 5);
ConvertBits<8, 5, true>([&](unsigned char c) { data.push_back(c); }, id.program, id.program + id.length);
return bech32::Encode(m_params.Bech32HRP(), 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 PKHash(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 ScriptHash(hash);
}
}
data.clear();
auto bech = bech32::Decode(str);
if (bech.second.size() > 0 && bech.first == params.Bech32HRP()) {
// Bech32 decoding
int version = bech.second[0]; // The first 5 bit symbol is the witness version (0-16)
// The rest of the symbols are converted witness program bytes.
data.reserve(((bech.second.size() - 1) * 5) / 8);
if (ConvertBits<5, 8, false>([&](unsigned char c) { data.push_back(c); }, bech.second.begin() + 1, bech.second.end())) {
if (version == 0) {
{
WitnessV0KeyHash keyid;
if (data.size() == keyid.size()) {
std::copy(data.begin(), data.end(), keyid.begin());
return keyid;
}
}
{
WitnessV0ScriptHash scriptid;
if (data.size() == scriptid.size()) {
std::copy(data.begin(), data.end(), scriptid.begin());
return scriptid;
}
}
return CNoDestination();
}
if (version > 16 || data.size() < 2 || data.size() > 40) {
return CNoDestination();
}
WitnessUnknown unk;
unk.version = version;
std::copy(data.begin(), data.end(), unk.program);
unk.length = data.size();
return unk;
}
}
return CNoDestination();
}
} // 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);
}
}
if (!data.empty()) {
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());
}
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