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265 lines
10 KiB
265 lines
10 KiB
// Copyright (c) 2014-2019 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <key_io.h>
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#include <base58.h>
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#include <bech32.h>
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#include <util/strencodings.h>
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#include <boost/variant/apply_visitor.hpp>
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#include <boost/variant/static_visitor.hpp>
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#include <assert.h>
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#include <string.h>
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#include <algorithm>
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namespace
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{
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class DestinationEncoder : public boost::static_visitor<std::string>
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{
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private:
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const CChainParams& m_params;
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public:
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explicit DestinationEncoder(const CChainParams& params) : m_params(params) {}
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std::string operator()(const PKHash& id) const
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{
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std::vector<unsigned char> data = m_params.Base58Prefix(CChainParams::PUBKEY_ADDRESS);
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data.insert(data.end(), id.begin(), id.end());
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return EncodeBase58Check(data);
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}
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std::string operator()(const ScriptHash& id) const
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{
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std::vector<unsigned char> data = m_params.Base58Prefix(CChainParams::SCRIPT_ADDRESS2);
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data.insert(data.end(), id.begin(), id.end());
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return EncodeBase58Check(data);
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}
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std::string operator()(const WitnessV0KeyHash& id) const
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{
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std::vector<unsigned char> data = {0};
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data.reserve(33);
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ConvertBits<8, 5, true>([&](unsigned char c) { data.push_back(c); }, id.begin(), id.end());
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return bech32::Encode(bech32::Encoding::BECH32, m_params.Bech32HRP(), data);
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}
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std::string operator()(const WitnessV0ScriptHash& id) const
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{
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std::vector<unsigned char> data = {0};
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data.reserve(53);
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ConvertBits<8, 5, true>([&](unsigned char c) { data.push_back(c); }, id.begin(), id.end());
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return bech32::Encode(bech32::Encoding::BECH32, m_params.Bech32HRP(), data);
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}
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std::string operator()(const WitnessUnknown& id) const
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{
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if (id.version < 1 || id.version > 16 || id.length < 2 || id.length > 40) {
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return {};
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}
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std::vector<unsigned char> data = {(unsigned char)id.version};
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data.reserve(1 + (id.length * 8 + 4) / 5);
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ConvertBits<8, 5, true>([&](unsigned char c) { data.push_back(c); }, id.program, id.program + id.length);
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return bech32::Encode(bech32::Encoding::BECH32M, m_params.Bech32HRP(), data);
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}
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std::string operator()(const StealthAddress& id) const
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{
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std::vector<uint8_t> serialized = id.Serialized();
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std::vector<uint8_t> converted = {0};
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ConvertBits<8, 5, true>([&](unsigned char c) { converted.push_back(c); }, serialized.begin(), serialized.end());
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return bech32::Encode(bech32::Encoding::BECH32, m_params.MWEB_HRP(), converted);
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}
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std::string operator()(const CNoDestination& no) const { return {}; }
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};
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CTxDestination DecodeDestination(const std::string& str, const CChainParams& params)
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{
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std::vector<unsigned char> data;
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uint160 hash;
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if (DecodeBase58Check(str, data, 21)) {
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// base58-encoded Bitcoin addresses.
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// Public-key-hash-addresses have version 0 (or 111 testnet).
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// The data vector contains RIPEMD160(SHA256(pubkey)), where pubkey is the serialized public key.
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const std::vector<unsigned char>& pubkey_prefix = params.Base58Prefix(CChainParams::PUBKEY_ADDRESS);
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if (data.size() == hash.size() + pubkey_prefix.size() && std::equal(pubkey_prefix.begin(), pubkey_prefix.end(), data.begin())) {
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std::copy(data.begin() + pubkey_prefix.size(), data.end(), hash.begin());
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return PKHash(hash);
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}
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// Script-hash-addresses have version 5 for 3 prefix (or 196 testnet).
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// The data vector contains RIPEMD160(SHA256(cscript)), where cscript is the serialized redemption script.
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const std::vector<unsigned char>& script_prefix = params.Base58Prefix(CChainParams::SCRIPT_ADDRESS);
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if (data.size() == hash.size() + script_prefix.size() && std::equal(script_prefix.begin(), script_prefix.end(), data.begin())) {
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std::copy(data.begin() + script_prefix.size(), data.end(), hash.begin());
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return ScriptHash(hash);
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}
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// Script-hash-addresses have version 5 for M prefix (or 196 testnet).
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// The data vector contains RIPEMD160(SHA256(cscript)), where cscript is the serialized redemption script.
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const std::vector<unsigned char>& script_prefix2 = params.Base58Prefix(CChainParams::SCRIPT_ADDRESS2);
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if (data.size() == hash.size() + script_prefix2.size() && std::equal(script_prefix2.begin(), script_prefix2.end(), data.begin())) {
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std::copy(data.begin() + script_prefix2.size(), data.end(), hash.begin());
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return ScriptHash(hash);
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}
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}
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data.clear();
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const auto dec = bech32::Decode(str);
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if ((dec.encoding == bech32::Encoding::BECH32 || dec.encoding == bech32::Encoding::BECH32M) && dec.data.size() > 0 && dec.hrp == params.Bech32HRP()) {
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// Bech32 decoding
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int version = dec.data[0]; // The first 5 bit symbol is the witness version (0-16)
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if (version == 0 && dec.encoding != bech32::Encoding::BECH32) {
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return CNoDestination();
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}
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if (version != 0 && dec.encoding != bech32::Encoding::BECH32M) {
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return CNoDestination();
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}
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// The rest of the symbols are converted witness program bytes.
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data.reserve(((dec.data.size() - 1) * 5) / 8);
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if (ConvertBits<5, 8, false>([&](unsigned char c) { data.push_back(c); }, dec.data.begin() + 1, dec.data.end())) {
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if (version == 0) {
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{
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WitnessV0KeyHash keyid;
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if (data.size() == keyid.size()) {
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std::copy(data.begin(), data.end(), keyid.begin());
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return keyid;
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}
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}
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{
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WitnessV0ScriptHash scriptid;
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if (data.size() == scriptid.size()) {
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std::copy(data.begin(), data.end(), scriptid.begin());
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return scriptid;
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}
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}
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return CNoDestination();
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}
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if (version > 16 || data.size() < 2 || data.size() > 40) {
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return CNoDestination();
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}
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WitnessUnknown unk;
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unk.version = version;
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std::copy(data.begin(), data.end(), unk.program);
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unk.length = data.size();
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return unk;
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}
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}
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auto decoded = bech32::Decode(str, true);
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if (decoded.encoding == bech32::Encoding::BECH32 && decoded.hrp == params.MWEB_HRP()) {
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std::vector<uint8_t> converted;
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converted.reserve(((decoded.data.size() - 1) * 5) / 8);
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if (ConvertBits<5, 8, false>([&](unsigned char c) { converted.push_back(c); }, decoded.data.begin() + 1, decoded.data.end())) {
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if (converted.size() == 66) {
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return StealthAddress(BigInt<33>(converted.data()), BigInt<33>(converted.data() + 33));
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}
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}
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}
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return CNoDestination();
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}
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} // namespace
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CKey DecodeSecret(const std::string& str)
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{
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CKey key;
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std::vector<unsigned char> data;
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if (DecodeBase58Check(str, data, 34)) {
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const std::vector<unsigned char>& privkey_prefix = Params().Base58Prefix(CChainParams::SECRET_KEY);
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if ((data.size() == 32 + privkey_prefix.size() || (data.size() == 33 + privkey_prefix.size() && data.back() == 1)) &&
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std::equal(privkey_prefix.begin(), privkey_prefix.end(), data.begin())) {
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bool compressed = data.size() == 33 + privkey_prefix.size();
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key.Set(data.begin() + privkey_prefix.size(), data.begin() + privkey_prefix.size() + 32, compressed);
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}
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}
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if (!data.empty()) {
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memory_cleanse(data.data(), data.size());
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}
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return key;
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}
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std::string EncodeSecret(const CKey& key)
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{
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assert(key.IsValid());
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std::vector<unsigned char> data = Params().Base58Prefix(CChainParams::SECRET_KEY);
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data.insert(data.end(), key.begin(), key.end());
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if (key.IsCompressed()) {
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data.push_back(1);
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}
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std::string ret = EncodeBase58Check(data);
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memory_cleanse(data.data(), data.size());
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return ret;
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}
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CExtPubKey DecodeExtPubKey(const std::string& str)
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{
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CExtPubKey key;
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std::vector<unsigned char> data;
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if (DecodeBase58Check(str, data, 78)) {
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const std::vector<unsigned char>& prefix = Params().Base58Prefix(CChainParams::EXT_PUBLIC_KEY);
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if (data.size() == BIP32_EXTKEY_SIZE + prefix.size() && std::equal(prefix.begin(), prefix.end(), data.begin())) {
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key.Decode(data.data() + prefix.size());
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}
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}
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return key;
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}
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std::string EncodeExtPubKey(const CExtPubKey& key)
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{
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std::vector<unsigned char> data = Params().Base58Prefix(CChainParams::EXT_PUBLIC_KEY);
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size_t size = data.size();
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data.resize(size + BIP32_EXTKEY_SIZE);
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key.Encode(data.data() + size);
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std::string ret = EncodeBase58Check(data);
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return ret;
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}
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CExtKey DecodeExtKey(const std::string& str)
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{
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CExtKey key;
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std::vector<unsigned char> data;
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if (DecodeBase58Check(str, data, 78)) {
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const std::vector<unsigned char>& prefix = Params().Base58Prefix(CChainParams::EXT_SECRET_KEY);
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if (data.size() == BIP32_EXTKEY_SIZE + prefix.size() && std::equal(prefix.begin(), prefix.end(), data.begin())) {
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key.Decode(data.data() + prefix.size());
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}
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}
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return key;
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}
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std::string EncodeExtKey(const CExtKey& key)
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{
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std::vector<unsigned char> data = Params().Base58Prefix(CChainParams::EXT_SECRET_KEY);
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size_t size = data.size();
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data.resize(size + BIP32_EXTKEY_SIZE);
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key.Encode(data.data() + size);
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std::string ret = EncodeBase58Check(data);
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memory_cleanse(data.data(), data.size());
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return ret;
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}
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std::string EncodeDestination(const CTxDestination& dest)
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{
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return boost::apply_visitor(DestinationEncoder(Params()), dest);
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}
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CTxDestination DecodeDestination(const std::string& str)
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{
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return DecodeDestination(str, Params());
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}
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bool IsValidDestinationString(const std::string& str, const CChainParams& params)
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{
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return IsValidDestination(DecodeDestination(str, params));
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}
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bool IsValidDestinationString(const std::string& str)
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{
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return IsValidDestinationString(str, Params());
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}
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