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407 lines
11 KiB
407 lines
11 KiB
// Copyright (c) 2009-2010 Satoshi Nakamoto |
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// Copyright (c) 2009-2012 The Bitcoin Developers |
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// Distributed under the MIT/X11 software license, see the accompanying |
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// file license.txt or http://www.opensource.org/licenses/mit-license.php. |
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// |
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// Why base-58 instead of standard base-64 encoding? |
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// - Don't want 0OIl characters that look the same in some fonts and |
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// could be used to create visually identical looking account numbers. |
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// - A string with non-alphanumeric characters is not as easily accepted as an account number. |
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// - E-mail usually won't line-break if there's no punctuation to break at. |
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// - Doubleclicking selects the whole number as one word if it's all alphanumeric. |
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// |
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#ifndef BITCOIN_BASE58_H |
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#define BITCOIN_BASE58_H |
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#include <string> |
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#include <vector> |
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#include "bignum.h" |
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#include "key.h" |
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static const char* pszBase58 = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"; |
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// Encode a byte sequence as a base58-encoded string |
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inline std::string EncodeBase58(const unsigned char* pbegin, const unsigned char* pend) |
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{ |
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CAutoBN_CTX pctx; |
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CBigNum bn58 = 58; |
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CBigNum bn0 = 0; |
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// Convert big endian data to little endian |
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// Extra zero at the end make sure bignum will interpret as a positive number |
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std::vector<unsigned char> vchTmp(pend-pbegin+1, 0); |
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reverse_copy(pbegin, pend, vchTmp.begin()); |
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// Convert little endian data to bignum |
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CBigNum bn; |
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bn.setvch(vchTmp); |
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// Convert bignum to std::string |
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std::string str; |
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// Expected size increase from base58 conversion is approximately 137% |
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// use 138% to be safe |
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str.reserve((pend - pbegin) * 138 / 100 + 1); |
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CBigNum dv; |
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CBigNum rem; |
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while (bn > bn0) |
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{ |
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if (!BN_div(&dv, &rem, &bn, &bn58, pctx)) |
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throw bignum_error("EncodeBase58 : BN_div failed"); |
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bn = dv; |
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unsigned int c = rem.getulong(); |
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str += pszBase58[c]; |
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} |
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// Leading zeroes encoded as base58 zeros |
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for (const unsigned char* p = pbegin; p < pend && *p == 0; p++) |
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str += pszBase58[0]; |
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// Convert little endian std::string to big endian |
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reverse(str.begin(), str.end()); |
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return str; |
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} |
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// Encode a byte vector as a base58-encoded string |
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inline 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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// Decode a base58-encoded string psz into byte vector vchRet |
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// returns true if decoding is succesful |
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inline bool DecodeBase58(const char* psz, std::vector<unsigned char>& vchRet) |
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{ |
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CAutoBN_CTX pctx; |
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vchRet.clear(); |
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CBigNum bn58 = 58; |
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CBigNum bn = 0; |
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CBigNum bnChar; |
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while (isspace(*psz)) |
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psz++; |
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// Convert big endian string to bignum |
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for (const char* p = psz; *p; p++) |
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{ |
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const char* p1 = strchr(pszBase58, *p); |
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if (p1 == NULL) |
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{ |
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while (isspace(*p)) |
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p++; |
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if (*p != '\0') |
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return false; |
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break; |
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} |
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bnChar.setulong(p1 - pszBase58); |
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if (!BN_mul(&bn, &bn, &bn58, pctx)) |
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throw bignum_error("DecodeBase58 : BN_mul failed"); |
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bn += bnChar; |
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} |
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// Get bignum as little endian data |
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std::vector<unsigned char> vchTmp = bn.getvch(); |
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// Trim off sign byte if present |
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if (vchTmp.size() >= 2 && vchTmp.end()[-1] == 0 && vchTmp.end()[-2] >= 0x80) |
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vchTmp.erase(vchTmp.end()-1); |
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// Restore leading zeros |
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int nLeadingZeros = 0; |
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for (const char* p = psz; *p == pszBase58[0]; p++) |
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nLeadingZeros++; |
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vchRet.assign(nLeadingZeros + vchTmp.size(), 0); |
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// Convert little endian data to big endian |
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reverse_copy(vchTmp.begin(), vchTmp.end(), vchRet.end() - vchTmp.size()); |
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return true; |
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} |
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// Decode a base58-encoded string str into byte vector vchRet |
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// returns true if decoding is succesful |
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inline 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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// Encode a byte vector to a base58-encoded string, including checksum |
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inline 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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// Decode a base58-encoded string psz that includes a checksum, into byte vector vchRet |
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// returns true if decoding is succesful |
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inline 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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return false; |
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if (vchRet.size() < 4) |
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{ |
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vchRet.clear(); |
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return false; |
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} |
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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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{ |
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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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// Decode a base58-encoded string str that includes a checksum, into byte vector vchRet |
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// returns true if decoding is succesful |
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inline 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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// Base class for all base58-encoded data |
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class CBase58Data |
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{ |
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protected: |
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// the version byte |
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unsigned char nVersion; |
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// the actually encoded data |
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std::vector<unsigned char> vchData; |
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CBase58Data() |
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{ |
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nVersion = 0; |
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vchData.clear(); |
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} |
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~CBase58Data() |
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{ |
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// zero the memory, as it may contain sensitive data |
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if (!vchData.empty()) |
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memset(&vchData[0], 0, vchData.size()); |
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} |
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void SetData(int nVersionIn, const void* pdata, size_t nSize) |
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{ |
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nVersion = nVersionIn; |
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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 SetData(int nVersionIn, const unsigned char *pbegin, const unsigned char *pend) |
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{ |
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SetData(nVersionIn, (void*)pbegin, pend - pbegin); |
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} |
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public: |
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bool SetString(const char* psz) |
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{ |
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std::vector<unsigned char> vchTemp; |
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DecodeBase58Check(psz, vchTemp); |
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if (vchTemp.empty()) |
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{ |
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vchData.clear(); |
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nVersion = 0; |
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return false; |
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} |
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nVersion = vchTemp[0]; |
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vchData.resize(vchTemp.size() - 1); |
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if (!vchData.empty()) |
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memcpy(&vchData[0], &vchTemp[1], vchData.size()); |
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memset(&vchTemp[0], 0, vchTemp.size()); |
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return true; |
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} |
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bool 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 ToString() const |
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{ |
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std::vector<unsigned char> vch(1, nVersion); |
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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 CompareTo(const CBase58Data& b58) const |
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{ |
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if (nVersion < b58.nVersion) return -1; |
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if (nVersion > b58.nVersion) return 1; |
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if (vchData < b58.vchData) return -1; |
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if (vchData > b58.vchData) return 1; |
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return 0; |
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} |
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bool operator==(const CBase58Data& b58) const { return CompareTo(b58) == 0; } |
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bool operator<=(const CBase58Data& b58) const { return CompareTo(b58) <= 0; } |
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bool operator>=(const CBase58Data& b58) const { return CompareTo(b58) >= 0; } |
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bool operator< (const CBase58Data& b58) const { return CompareTo(b58) < 0; } |
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bool operator> (const CBase58Data& b58) const { return CompareTo(b58) > 0; } |
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}; |
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// base58-encoded bitcoin addresses |
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// Public-key-hash-addresses have version 0 (or 192 testnet) |
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// The data vector contains RIPEMD160(SHA256(pubkey)), where pubkey is the serialized public key |
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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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class CBitcoinAddress : public CBase58Data |
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{ |
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public: |
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enum |
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{ |
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PUBKEY_ADDRESS = 0, |
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SCRIPT_ADDRESS = 5, |
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PUBKEY_ADDRESS_TEST = 111, |
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SCRIPT_ADDRESS_TEST = 196, |
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}; |
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bool SetHash160(const uint160& hash160) |
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{ |
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SetData(fTestNet ? PUBKEY_ADDRESS_TEST : PUBKEY_ADDRESS, &hash160, 20); |
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return true; |
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} |
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void SetPubKey(const std::vector<unsigned char>& vchPubKey) |
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{ |
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SetHash160(Hash160(vchPubKey)); |
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} |
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bool SetScriptHash160(const uint160& hash160) |
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{ |
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SetData(fTestNet ? SCRIPT_ADDRESS_TEST : SCRIPT_ADDRESS, &hash160, 20); |
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return true; |
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} |
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bool IsValid() const |
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{ |
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int nExpectedSize = 20; |
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bool fExpectTestNet = false; |
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switch(nVersion) |
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{ |
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case PUBKEY_ADDRESS: |
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nExpectedSize = 20; // Hash of public key |
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fExpectTestNet = false; |
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break; |
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case SCRIPT_ADDRESS: |
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nExpectedSize = 20; // Hash of CScript |
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fExpectTestNet = false; |
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break; |
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case PUBKEY_ADDRESS_TEST: |
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nExpectedSize = 20; |
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fExpectTestNet = true; |
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break; |
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case SCRIPT_ADDRESS_TEST: |
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nExpectedSize = 20; |
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fExpectTestNet = true; |
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break; |
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default: |
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return false; |
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} |
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return fExpectTestNet == fTestNet && vchData.size() == nExpectedSize; |
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} |
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bool IsScript() const |
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{ |
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if (!IsValid()) |
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return false; |
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if (fTestNet) |
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return nVersion == SCRIPT_ADDRESS_TEST; |
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return nVersion == SCRIPT_ADDRESS; |
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} |
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CBitcoinAddress() |
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{ |
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} |
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CBitcoinAddress(uint160 hash160In) |
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{ |
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SetHash160(hash160In); |
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} |
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CBitcoinAddress(const std::vector<unsigned char>& vchPubKey) |
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{ |
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SetPubKey(vchPubKey); |
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} |
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CBitcoinAddress(const std::string& strAddress) |
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{ |
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SetString(strAddress); |
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} |
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CBitcoinAddress(const char* pszAddress) |
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{ |
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SetString(pszAddress); |
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} |
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uint160 GetHash160() const |
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{ |
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assert(vchData.size() == 20); |
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uint160 hash160; |
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memcpy(&hash160, &vchData[0], 20); |
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return hash160; |
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} |
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}; |
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class CBitcoinSecret : public CBase58Data |
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{ |
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public: |
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void SetSecret(const CSecret& vchSecret, bool fCompressed) |
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{ |
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assert(vchSecret.size() == 32); |
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SetData(fTestNet ? 239 : 128, &vchSecret[0], vchSecret.size()); |
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if (fCompressed) |
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vchData.push_back(1); |
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} |
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CSecret GetSecret(bool &fCompressedOut) |
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{ |
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CSecret vchSecret; |
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vchSecret.resize(32); |
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memcpy(&vchSecret[0], &vchData[0], 32); |
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fCompressedOut = vchData.size() == 33; |
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return vchSecret; |
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} |
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bool IsValid() const |
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{ |
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bool fExpectTestNet = false; |
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switch(nVersion) |
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{ |
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case 128: |
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break; |
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case 239: |
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fExpectTestNet = true; |
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break; |
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default: |
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return false; |
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} |
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return fExpectTestNet == fTestNet && (vchData.size() == 32 || (vchData.size() == 33 && vchData[32] == 1)); |
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} |
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CBitcoinSecret(const CSecret& vchSecret, bool fCompressed) |
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{ |
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SetSecret(vchSecret, fCompressed); |
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} |
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CBitcoinSecret() |
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{ |
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} |
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}; |
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#endif
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