323 lines
8.8 KiB
C++
323 lines
8.8 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2011 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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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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// 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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class CBitcoinAddress : public CBase58Data
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{
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public:
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bool SetHash160(const uint160& hash160)
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{
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SetData(fTestNet ? 111 : 0, &hash160, 20);
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return true;
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}
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bool SetPubKey(const std::vector<unsigned char>& vchPubKey)
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{
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return SetHash160(Hash160(vchPubKey));
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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 0:
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break;
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case 111:
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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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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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#endif
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