321 lines
9.1 KiB
C++
321 lines
9.1 KiB
C++
// Copyright (c) 2014-2016 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 "uint256.h"
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#include <assert.h>
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#include <stdint.h>
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#include <string.h>
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#include <vector>
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#include <string>
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#include <boost/variant/apply_visitor.hpp>
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#include <boost/variant/static_visitor.hpp>
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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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int length = 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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int size = strlen(psz) * 733 /1000 + 1; // log(58) / log(256), rounded up.
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std::vector<unsigned char> b256(size);
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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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int i = 0;
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for (std::vector<unsigned char>::reverse_iterator it = b256.rbegin(); (carry != 0 || i < length) && (it != b256.rend()); ++it, ++i) {
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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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length = i;
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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() + (size - length);
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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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int length = 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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int size = (pend - pbegin) * 138 / 100 + 1; // log(256) / log(58), rounded up.
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std::vector<unsigned char> b58(size);
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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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int i = 0;
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// Apply "b58 = b58 * 256 + ch".
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for (std::vector<unsigned char>::reverse_iterator it = b58.rbegin(); (carry != 0 || i < length) && (it != b58.rend()); it++, i++) {
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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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length = i;
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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() + (size - length);
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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[0], &vch[0] + 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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CBase58Data::CBase58Data()
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{
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vchVersion.clear();
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vchData.clear();
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}
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void CBase58Data::SetData(const std::vector<unsigned char>& vchVersionIn, const void* pdata, size_t nSize)
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{
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vchVersion = vchVersionIn;
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vchData.resize(nSize);
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if (!vchData.empty())
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memcpy(&vchData[0], pdata, nSize);
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}
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void CBase58Data::SetData(const std::vector<unsigned char>& vchVersionIn, const unsigned char* pbegin, const unsigned char* pend)
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{
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SetData(vchVersionIn, (void*)pbegin, pend - pbegin);
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}
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bool CBase58Data::SetString(const char* psz, unsigned int nVersionBytes)
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{
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std::vector<unsigned char> vchTemp;
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bool rc58 = DecodeBase58Check(psz, vchTemp);
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if ((!rc58) || (vchTemp.size() < nVersionBytes)) {
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vchData.clear();
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vchVersion.clear();
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return false;
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}
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vchVersion.assign(vchTemp.begin(), vchTemp.begin() + nVersionBytes);
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vchData.resize(vchTemp.size() - nVersionBytes);
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if (!vchData.empty())
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memcpy(&vchData[0], &vchTemp[nVersionBytes], vchData.size());
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memory_cleanse(&vchTemp[0], vchTemp.size());
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return true;
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}
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bool CBase58Data::SetString(const std::string& str)
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{
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return SetString(str.c_str());
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}
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std::string CBase58Data::ToString() const
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{
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std::vector<unsigned char> vch = vchVersion;
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vch.insert(vch.end(), vchData.begin(), vchData.end());
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return EncodeBase58Check(vch);
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}
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int CBase58Data::CompareTo(const CBase58Data& b58) const
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{
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if (vchVersion < b58.vchVersion)
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return -1;
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if (vchVersion > b58.vchVersion)
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return 1;
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if (vchData < b58.vchData)
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return -1;
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if (vchData > b58.vchData)
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return 1;
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return 0;
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}
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namespace
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{
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class CBitcoinAddressVisitor : public boost::static_visitor<bool>
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{
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private:
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CBitcoinAddress* addr;
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public:
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CBitcoinAddressVisitor(CBitcoinAddress* addrIn) : addr(addrIn) {}
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bool operator()(const CKeyID& id) const { return addr->Set(id); }
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bool operator()(const CScriptID& id) const { return addr->Set(id); }
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bool operator()(const CNoDestination& no) const { return false; }
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};
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} // anon namespace
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bool CBitcoinAddress::Set(const CKeyID& id)
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{
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SetData(Params().Base58Prefix(CChainParams::PUBKEY_ADDRESS), &id, 20);
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return true;
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}
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bool CBitcoinAddress::Set(const CScriptID& id)
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{
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SetData(Params().Base58Prefix(CChainParams::SCRIPT_ADDRESS), &id, 20);
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return true;
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}
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bool CBitcoinAddress::Set(const CTxDestination& dest)
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{
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return boost::apply_visitor(CBitcoinAddressVisitor(this), dest);
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}
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bool CBitcoinAddress::IsValid() const
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{
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return IsValid(Params());
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}
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bool CBitcoinAddress::IsValid(const CChainParams& params) const
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{
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bool fCorrectSize = vchData.size() == 20;
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bool fKnownVersion = vchVersion == params.Base58Prefix(CChainParams::PUBKEY_ADDRESS) ||
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vchVersion == params.Base58Prefix(CChainParams::SCRIPT_ADDRESS);
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return fCorrectSize && fKnownVersion;
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}
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CTxDestination CBitcoinAddress::Get() const
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{
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if (!IsValid())
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return CNoDestination();
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uint160 id;
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memcpy(&id, &vchData[0], 20);
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if (vchVersion == Params().Base58Prefix(CChainParams::PUBKEY_ADDRESS))
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return CKeyID(id);
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else if (vchVersion == Params().Base58Prefix(CChainParams::SCRIPT_ADDRESS))
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return CScriptID(id);
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else
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return CNoDestination();
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}
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bool CBitcoinAddress::GetKeyID(CKeyID& keyID) const
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{
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if (!IsValid() || vchVersion != Params().Base58Prefix(CChainParams::PUBKEY_ADDRESS))
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return false;
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uint160 id;
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memcpy(&id, &vchData[0], 20);
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keyID = CKeyID(id);
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return true;
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}
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bool CBitcoinAddress::IsScript() const
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{
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return IsValid() && vchVersion == Params().Base58Prefix(CChainParams::SCRIPT_ADDRESS);
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}
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void CBitcoinSecret::SetKey(const CKey& vchSecret)
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{
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assert(vchSecret.IsValid());
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SetData(Params().Base58Prefix(CChainParams::SECRET_KEY), vchSecret.begin(), vchSecret.size());
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if (vchSecret.IsCompressed())
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vchData.push_back(1);
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}
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CKey CBitcoinSecret::GetKey()
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{
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CKey ret;
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assert(vchData.size() >= 32);
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ret.Set(vchData.begin(), vchData.begin() + 32, vchData.size() > 32 && vchData[32] == 1);
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return ret;
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}
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bool CBitcoinSecret::IsValid() const
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{
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bool fExpectedFormat = vchData.size() == 32 || (vchData.size() == 33 && vchData[32] == 1);
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bool fCorrectVersion = vchVersion == Params().Base58Prefix(CChainParams::SECRET_KEY);
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return fExpectedFormat && fCorrectVersion;
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}
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bool CBitcoinSecret::SetString(const char* pszSecret)
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{
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return CBase58Data::SetString(pszSecret) && IsValid();
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}
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bool CBitcoinSecret::SetString(const std::string& strSecret)
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{
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return SetString(strSecret.c_str());
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}
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