diff --git a/src/base58.cpp b/src/base58.cpp index 2b956200c..a14a2b3dd 100644 --- a/src/base58.cpp +++ b/src/base58.cpp @@ -1,303 +1,301 @@ // Copyright (c) 2014-2016 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 "base58.h" #include "hash.h" #include "script/script.h" #include "uint256.h" #include #include #include #include #include #include #include /** All alphanumeric characters except for "0", "I", "O", and "l" */ static const char *pszBase58 = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"; bool DecodeBase58(const char *psz, std::vector &vch) { // Skip leading spaces. while (*psz && isspace(*psz)) { psz++; } // Skip and count leading '1's. int zeroes = 0; int length = 0; while (*psz == '1') { zeroes++; psz++; } // Allocate enough space in big-endian base256 representation. // log(58) / log(256), rounded up. int size = strlen(psz) * 733 / 1000 + 1; std::vector b256(size); // Process the characters. while (*psz && !isspace(*psz)) { // Decode base58 character const char *ch = strchr(pszBase58, *psz); if (ch == nullptr) { return false; } // Apply "b256 = b256 * 58 + ch". int carry = ch - pszBase58; int i = 0; for (std::vector::reverse_iterator it = b256.rbegin(); (carry != 0 || i < length) && (it != b256.rend()); ++it, ++i) { carry += 58 * (*it); *it = carry % 256; carry /= 256; } assert(carry == 0); length = i; psz++; } // Skip trailing spaces. while (isspace(*psz)) { psz++; } if (*psz != 0) { return false; } // Skip leading zeroes in b256. std::vector::iterator it = b256.begin() + (size - length); while (it != b256.end() && *it == 0) it++; // Copy result into output vector. vch.reserve(zeroes + (b256.end() - it)); vch.assign(zeroes, 0x00); while (it != b256.end()) { vch.push_back(*(it++)); } return true; } std::string EncodeBase58(const uint8_t *pbegin, const uint8_t *pend) { // Skip & count leading zeroes. int zeroes = 0; int length = 0; while (pbegin != pend && *pbegin == 0) { pbegin++; zeroes++; } // Allocate enough space in big-endian base58 representation. // log(256) / log(58), rounded up. int size = (pend - pbegin) * 138 / 100 + 1; std::vector b58(size); // Process the bytes. while (pbegin != pend) { int carry = *pbegin; int i = 0; // Apply "b58 = b58 * 256 + ch". for (std::vector::reverse_iterator it = b58.rbegin(); (carry != 0 || i < length) && (it != b58.rend()); it++, i++) { carry += 256 * (*it); *it = carry % 58; carry /= 58; } assert(carry == 0); length = i; pbegin++; } // Skip leading zeroes in base58 result. std::vector::iterator it = b58.begin() + (size - length); while (it != b58.end() && *it == 0) { it++; } // Translate the result into a string. std::string str; str.reserve(zeroes + (b58.end() - it)); str.assign(zeroes, '1'); while (it != b58.end()) { str += pszBase58[*(it++)]; } return str; } std::string EncodeBase58(const std::vector &vch) { return EncodeBase58(&vch[0], &vch[0] + vch.size()); } bool DecodeBase58(const std::string &str, std::vector &vchRet) { return DecodeBase58(str.c_str(), vchRet); } std::string EncodeBase58Check(const std::vector &vchIn) { // add 4-byte hash check to the end std::vector vch(vchIn); uint256 hash = Hash(vch.begin(), vch.end()); vch.insert(vch.end(), (uint8_t *)&hash, (uint8_t *)&hash + 4); return EncodeBase58(vch); } bool DecodeBase58Check(const char *psz, std::vector &vchRet) { if (!DecodeBase58(psz, vchRet) || (vchRet.size() < 4)) { vchRet.clear(); return false; } // re-calculate the checksum, insure it matches the included 4-byte checksum uint256 hash = Hash(vchRet.begin(), vchRet.end() - 4); if (memcmp(&hash, &vchRet.end()[-4], 4) != 0) { vchRet.clear(); return false; } vchRet.resize(vchRet.size() - 4); return true; } bool DecodeBase58Check(const std::string &str, std::vector &vchRet) { return DecodeBase58Check(str.c_str(), vchRet); } CBase58Data::CBase58Data() { vchVersion.clear(); vchData.clear(); } void CBase58Data::SetData(const std::vector &vchVersionIn, const void *pdata, size_t nSize) { vchVersion = vchVersionIn; vchData.resize(nSize); if (!vchData.empty()) { memcpy(&vchData[0], pdata, nSize); } } void CBase58Data::SetData(const std::vector &vchVersionIn, const uint8_t *pbegin, const uint8_t *pend) { SetData(vchVersionIn, (void *)pbegin, pend - pbegin); } bool CBase58Data::SetString(const char *psz, unsigned int nVersionBytes) { std::vector vchTemp; bool rc58 = DecodeBase58Check(psz, vchTemp); if ((!rc58) || (vchTemp.size() < nVersionBytes)) { vchData.clear(); vchVersion.clear(); return false; } vchVersion.assign(vchTemp.begin(), vchTemp.begin() + nVersionBytes); vchData.resize(vchTemp.size() - nVersionBytes); if (!vchData.empty()) { memcpy(&vchData[0], &vchTemp[nVersionBytes], vchData.size()); } memory_cleanse(&vchTemp[0], vchTemp.size()); return true; } bool CBase58Data::SetString(const std::string &str) { return SetString(str.c_str()); } std::string CBase58Data::ToString() const { std::vector vch = vchVersion; vch.insert(vch.end(), vchData.begin(), vchData.end()); return EncodeBase58Check(vch); } int CBase58Data::CompareTo(const CBase58Data &b58) const { if (vchVersion < b58.vchVersion) return -1; if (vchVersion > b58.vchVersion) return 1; if (vchData < b58.vchData) return -1; if (vchData > b58.vchData) return 1; return 0; } namespace { class DestinationEncoder : public boost::static_visitor { private: const CChainParams &m_params; public: DestinationEncoder(const CChainParams ¶ms) : m_params(params) {} std::string operator()(const CKeyID &id) const { std::vector 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 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 ¶ms) { std::vector data; uint160 hash; if (!DecodeBase58Check(str, data)) { return CNoDestination(); } // Base58Check decoding const std::vector &pubkey_prefix = params.Base58Prefix(CChainParams::PUBKEY_ADDRESS); if (data.size() == 20 + pubkey_prefix.size() && std::equal(pubkey_prefix.begin(), pubkey_prefix.end(), data.begin())) { memcpy(hash.begin(), &data[pubkey_prefix.size()], 20); return CKeyID(hash); } const std::vector &script_prefix = params.Base58Prefix(CChainParams::SCRIPT_ADDRESS); if (data.size() == 20 + script_prefix.size() && std::equal(script_prefix.begin(), script_prefix.end(), data.begin())) { memcpy(hash.begin(), &data[script_prefix.size()], 20); return CScriptID(hash); } return CNoDestination(); } } // namespace -} // namespace - void CBitcoinSecret::SetKey(const CKey &vchSecret) { assert(vchSecret.IsValid()); SetData(Params().Base58Prefix(CChainParams::SECRET_KEY), vchSecret.begin(), vchSecret.size()); if (vchSecret.IsCompressed()) vchData.push_back(1); } CKey CBitcoinSecret::GetKey() { CKey ret; assert(vchData.size() >= 32); ret.Set(vchData.begin(), vchData.begin() + 32, vchData.size() > 32 && vchData[32] == 1); return ret; } bool CBitcoinSecret::IsValid() const { bool fExpectedFormat = vchData.size() == 32 || (vchData.size() == 33 && vchData[32] == 1); bool fCorrectVersion = vchVersion == Params().Base58Prefix(CChainParams::SECRET_KEY); return fExpectedFormat && fCorrectVersion; } bool CBitcoinSecret::SetString(const char *pszSecret) { return CBase58Data::SetString(pszSecret) && IsValid(); } bool CBitcoinSecret::SetString(const std::string &strSecret) { return SetString(strSecret.c_str()); } std::string EncodeLegacyAddr(const CTxDestination &dest, const CChainParams ¶ms) { return boost::apply_visitor(DestinationEncoder(params), dest); } CTxDestination DecodeLegacyAddr(const std::string &str, const CChainParams ¶ms) { return DecodeDestination(str, params); }