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202 lines
5.5 KiB
202 lines
5.5 KiB
16 years ago
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// Copyright (c) 2009 Satoshi Nakamoto
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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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static const char* pszBase58 = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
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inline 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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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 string
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string str;
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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 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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inline string EncodeBase58(const 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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inline bool DecodeBase58(const char* psz, 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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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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inline bool DecodeBase58(const string& str, 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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inline string EncodeBase58Check(const vector<unsigned char>& vchIn)
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{
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// add 4-byte hash check to the end
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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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inline bool DecodeBase58Check(const char* psz, 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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inline bool DecodeBase58Check(const string& str, 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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static const unsigned char ADDRESSVERSION = 0;
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inline string Hash160ToAddress(uint160 hash160)
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{
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// add 1-byte version number to the front
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vector<unsigned char> vch(1, ADDRESSVERSION);
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vch.insert(vch.end(), UBEGIN(hash160), UEND(hash160));
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return EncodeBase58Check(vch);
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}
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inline bool AddressToHash160(const char* psz, uint160& hash160Ret)
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{
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vector<unsigned char> vch;
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if (!DecodeBase58Check(psz, vch))
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return false;
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if (vch.empty())
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return false;
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unsigned char nVersion = vch[0];
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if (vch.size() != sizeof(hash160Ret) + 1)
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return false;
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memcpy(&hash160Ret, &vch[1], sizeof(hash160Ret));
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return (nVersion <= ADDRESSVERSION);
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}
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inline bool AddressToHash160(const string& str, uint160& hash160Ret)
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{
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return AddressToHash160(str.c_str(), hash160Ret);
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}
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inline bool IsValidBitcoinAddress(const char* psz)
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{
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uint160 hash160;
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return AddressToHash160(psz, hash160);
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}
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inline bool IsValidBitcoinAddress(const string& str)
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{
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return IsValidBitcoinAddress(str.c_str());
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}
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inline string PubKeyToAddress(const vector<unsigned char>& vchPubKey)
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{
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return Hash160ToAddress(Hash160(vchPubKey));
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}
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