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// Copyright (c) 2014 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 "base58.h"
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#include "hash.h"
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#include "script/script.h"
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#include "uint256.h"
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#include "version.h"
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#include "streams.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 <algorithm>
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#include <assert.h>
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#include <string.h>
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/** All alphanumeric characters except for "0", "I", "O", and "l" */
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static const char* pszBase58 = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
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bool DecodeBase58(const char* psz, std::vector<unsigned char>& vch)
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{
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// Skip leading spaces.
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while (*psz && isspace(*psz))
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psz++;
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// Skip and count leading '1's.
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int zeroes = 0;
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while (*psz == '1') {
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zeroes++;
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psz++;
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}
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// Allocate enough space in big-endian base256 representation.
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std::vector<unsigned char> b256(strlen(psz) * 733 / 1000 + 1); // log(58) / log(256), rounded up.
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// Process the characters.
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while (*psz && !isspace(*psz)) {
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// Decode base58 character
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const char* ch = strchr(pszBase58, *psz);
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if (ch == NULL)
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return false;
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// Apply "b256 = b256 * 58 + ch".
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int carry = ch - pszBase58;
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for (std::vector<unsigned char>::reverse_iterator it = b256.rbegin(); it != b256.rend(); it++) {
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carry += 58 * (*it);
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*it = carry % 256;
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carry /= 256;
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}
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assert(carry == 0);
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psz++;
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}
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// Skip trailing spaces.
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while (isspace(*psz))
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psz++;
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if (*psz != 0)
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return false;
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// Skip leading zeroes in b256.
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std::vector<unsigned char>::iterator it = b256.begin();
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while (it != b256.end() && *it == 0)
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it++;
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// Copy result into output vector.
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vch.reserve(zeroes + (b256.end() - it));
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vch.assign(zeroes, 0x00);
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while (it != b256.end())
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vch.push_back(*(it++));
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return true;
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}
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std::string EncodeBase58(const unsigned char* pbegin, const unsigned char* pend)
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{
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// Skip & count leading zeroes.
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int zeroes = 0;
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while (pbegin != pend && *pbegin == 0) {
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pbegin++;
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zeroes++;
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}
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// Allocate enough space in big-endian base58 representation.
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std::vector<unsigned char> b58((pend - pbegin) * 138 / 100 + 1); // log(256) / log(58), rounded up.
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// Process the bytes.
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while (pbegin != pend) {
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int carry = *pbegin;
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// Apply "b58 = b58 * 256 + ch".
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for (std::vector<unsigned char>::reverse_iterator it = b58.rbegin(); it != b58.rend(); it++) {
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carry += 256 * (*it);
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*it = carry % 58;
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carry /= 58;
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}
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assert(carry == 0);
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pbegin++;
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}
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// Skip leading zeroes in base58 result.
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std::vector<unsigned char>::iterator it = b58.begin();
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while (it != b58.end() && *it == 0)
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it++;
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// Translate the result into a string.
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std::string str;
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str.reserve(zeroes + (b58.end() - it));
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str.assign(zeroes, '1');
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while (it != b58.end())
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str += pszBase58[*(it++)];
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return str;
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}
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std::string EncodeBase58(const std::vector<unsigned char>& vch)
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{
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return EncodeBase58(vch.data(), vch.data() + vch.size());
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}
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bool DecodeBase58(const std::string& str, std::vector<unsigned char>& vchRet)
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{
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return DecodeBase58(str.c_str(), vchRet);
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}
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std::string EncodeBase58Check(const std::vector<unsigned char>& vchIn)
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{
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// add 4-byte hash check to the end
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std::vector<unsigned char> vch(vchIn);
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uint256 hash = Hash(vch.begin(), vch.end());
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vch.insert(vch.end(), (unsigned char*)&hash, (unsigned char*)&hash + 4);
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return EncodeBase58(vch);
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}
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bool DecodeBase58Check(const char* psz, std::vector<unsigned char>& vchRet)
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{
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if (!DecodeBase58(psz, vchRet) ||
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(vchRet.size() < 4)) {
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vchRet.clear();
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return false;
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}
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// re-calculate the checksum, insure it matches the included 4-byte checksum
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uint256 hash = Hash(vchRet.begin(), vchRet.end() - 4);
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if (memcmp(&hash, &vchRet.end()[-4], 4) != 0) {
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vchRet.clear();
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return false;
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}
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vchRet.resize(vchRet.size() - 4);
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return true;
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}
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bool DecodeBase58Check(const std::string& str, std::vector<unsigned char>& vchRet)
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{
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return DecodeBase58Check(str.c_str(), vchRet);
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}
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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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DestinationEncoder(const CChainParams& params) : m_params(params) {}
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std::string operator()(const CKeyID& 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 CScriptID& id) const
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{
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std::vector<unsigned char> data = m_params.Base58Prefix(CChainParams::SCRIPT_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 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)) {
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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 CKeyID(hash);
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}
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// Script-hash-addresses have version 5 (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 CScriptID(hash);
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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)) {
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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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memory_cleanse(data.data(), data.size());
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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)) {
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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)) {
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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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std::string EncodePaymentAddress(const libzcash::PaymentAddress& zaddr)
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{
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CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
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ss << zaddr;
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std::vector<unsigned char> data = Params().Base58Prefix(CChainParams::ZCPAYMENT_ADDRRESS);
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data.insert(data.end(), ss.begin(), ss.end());
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return EncodeBase58Check(data);
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}
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boost::optional<libzcash::PaymentAddress> DecodePaymentAddress(const std::string& str)
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{
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std::vector<unsigned char> data;
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if (DecodeBase58Check(str, data)) {
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const std::vector<unsigned char>& zaddr_prefix = Params().Base58Prefix(CChainParams::ZCPAYMENT_ADDRRESS);
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if ((data.size() == libzcash::SerializedPaymentAddressSize + zaddr_prefix.size()) &&
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std::equal(zaddr_prefix.begin(), zaddr_prefix.end(), data.begin())) {
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CSerializeData serialized(data.begin() + zaddr_prefix.size(), data.end());
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CDataStream ss(serialized, SER_NETWORK, PROTOCOL_VERSION);
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libzcash::PaymentAddress ret;
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ss >> ret;
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return ret;
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}
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}
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return boost::none;
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}
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std::string EncodeViewingKey(const libzcash::ViewingKey& vk)
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{
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CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
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ss << vk;
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std::vector<unsigned char> data = Params().Base58Prefix(CChainParams::ZCVIEWING_KEY);
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data.insert(data.end(), ss.begin(), ss.end());
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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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boost::optional<libzcash::ViewingKey> DecodeViewingKey(const std::string& str)
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{
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std::vector<unsigned char> data;
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if (DecodeBase58Check(str, data)) {
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const std::vector<unsigned char>& vk_prefix = Params().Base58Prefix(CChainParams::ZCVIEWING_KEY);
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if ((data.size() == libzcash::SerializedViewingKeySize + vk_prefix.size()) &&
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std::equal(vk_prefix.begin(), vk_prefix.end(), data.begin())) {
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CSerializeData serialized(data.begin() + vk_prefix.size(), data.end());
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CDataStream ss(serialized, SER_NETWORK, PROTOCOL_VERSION);
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libzcash::ViewingKey ret;
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ss >> ret;
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memory_cleanse(serialized.data(), serialized.size());
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memory_cleanse(data.data(), data.size());
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return ret;
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}
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}
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memory_cleanse(data.data(), data.size());
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return boost::none;
|
|
|
|
}
|
|
|
|
|
|
|
|
std::string EncodeSpendingKey(const libzcash::SpendingKey& zkey)
|
|
|
|
{
|
|
|
|
CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
|
|
|
|
ss << zkey;
|
|
|
|
std::vector<unsigned char> data = 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;
|
|
|
|
}
|
|
|
|
|
|
|
|
boost::optional<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::SpendingKey ret;
|
|
|
|
ss >> ret;
|
|
|
|
memory_cleanse(serialized.data(), serialized.size());
|
|
|
|
memory_cleanse(data.data(), data.size());
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
memory_cleanse(data.data(), data.size());
|
|
|
|
return boost::none;
|
|
|
|
}
|