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da0478e6e5
c6a995e Improve readability of DecodeBase58Check(...) (practicalswift)
Pull request description:
Use the more readable form ...
```c++
&vchRet[vchRet.size() - 4]
```
... instead of ...
```c++
&v.end()[-n]
```
Has the added benefit of eliminating a spurious static analyzer warning about improper use of negative values.
Tree-SHA512: 5895310c189e9322082c28f34342ff9a6c238e2cae3f204521111c8a7981bc555af60b42de082c91608c1125dfc244a65c4faf929249a067a51435e2be74cb39
378 lines
12 KiB
C++
378 lines
12 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 "bech32.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 "utilstrencodings.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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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 == nullptr)
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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.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, ensure 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[vchRet.size() - 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.data(), 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.data(), vchTemp.data() + nVersionBytes, vchData.size());
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memory_cleanse(vchTemp.data(), 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 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 WitnessV0KeyHash& id) const
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{
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std::vector<unsigned char> data = {0};
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ConvertBits<8, 5, true>(data, id.begin(), id.end());
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return bech32::Encode(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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ConvertBits<8, 5, true>(data, id.begin(), id.end());
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return bech32::Encode(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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ConvertBits<8, 5, true>(data, id.program, id.program + id.length);
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return bech32::Encode(m_params.Bech32HRP(), 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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data.clear();
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auto bech = bech32::Decode(str);
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if (bech.second.size() > 0 && bech.first == params.Bech32HRP()) {
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// Bech32 decoding
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int version = bech.second[0]; // The first 5 bit symbol is the witness version (0-16)
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// The rest of the symbols are converted witness program bytes.
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if (ConvertBits<5, 8, false>(data, bech.second.begin() + 1, bech.second.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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return CNoDestination();
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}
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} // namespace
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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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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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