--- /dev/null
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2012 The Bitcoin Developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+
+//
+// Why base-58 instead of standard base-64 encoding?
+// - Don't want 0OIl characters that look the same in some fonts and
+// could be used to create visually identical looking account numbers.
+// - A string with non-alphanumeric characters is not as easily accepted as an account number.
+// - E-mail usually won't line-break if there's no punctuation to break at.
+// - Double-clicking selects the whole number as one word if it's all alphanumeric.
+//
+
+#include <string>
+#include <vector>
+#include <openssl/crypto.h> // for OPENSSL_cleanse()
+#include "bignum.h"
+#include "key.h"
+#include "script.h"
+#include "base58.h"
+
+static const char* pszBase58 = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
+
+// Encode a byte sequence as a base58-encoded string
+std::string EncodeBase58(const unsigned char* pbegin, const unsigned char* pend)
+{
+ CAutoBN_CTX pctx;
+ CBigNum bn58 = 58;
+ CBigNum bn0 = 0;
+
+ // Convert big endian data to little endian
+ // Extra zero at the end make sure bignum will interpret as a positive number
+ std::vector<unsigned char> vchTmp(pend-pbegin+1, 0);
+ reverse_copy(pbegin, pend, vchTmp.begin());
+
+ // Convert little endian data to bignum
+ CBigNum bn;
+ bn.setvch(vchTmp);
+
+ // Convert bignum to std::string
+ std::string str;
+ // Expected size increase from base58 conversion is approximately 137%
+ // use 138% to be safe
+ str.reserve((pend - pbegin) * 138 / 100 + 1);
+ CBigNum dv;
+ CBigNum rem;
+ while (bn > bn0)
+ {
+ if (!BN_div(&dv, &rem, &bn, &bn58, pctx))
+ throw bignum_error("EncodeBase58 : BN_div failed");
+ bn = dv;
+ unsigned int c = rem.getuint32();
+ str += pszBase58[c];
+ }
+
+ // Leading zeroes encoded as base58 zeros
+ for (const unsigned char* p = pbegin; p < pend && *p == 0; p++)
+ str += pszBase58[0];
+
+ // Convert little endian std::string to big endian
+ reverse(str.begin(), str.end());
+ return str;
+}
+
+// Encode a byte vector as a base58-encoded string
+std::string EncodeBase58(const std::vector<unsigned char>& vch)
+{
+ return EncodeBase58(&vch[0], &vch[0] + vch.size());
+}
+
+// Decode a base58-encoded string psz into byte vector vchRet
+// returns true if decoding is successful
+bool DecodeBase58(const char* psz, std::vector<unsigned char>& vchRet)
+{
+ CAutoBN_CTX pctx;
+ vchRet.clear();
+ CBigNum bn58 = 58;
+ CBigNum bn = 0;
+ CBigNum bnChar;
+ while (isspace(*psz))
+ psz++;
+
+ // Convert big endian string to bignum
+ for (const char* p = psz; *p; p++)
+ {
+ const char* p1 = strchr(pszBase58, *p);
+ if (p1 == NULL)
+ {
+ while (isspace(*p))
+ p++;
+ if (*p != '\0')
+ return false;
+ break;
+ }
+ bnChar.setuint32((uint32_t)(p1 - pszBase58));
+ if (!BN_mul(&bn, &bn, &bn58, pctx))
+ throw bignum_error("DecodeBase58 : BN_mul failed");
+ bn += bnChar;
+ }
+
+ // Get bignum as little endian data
+ std::vector<unsigned char> vchTmp = bn.getvch();
+
+ // Trim off sign byte if present
+ if (vchTmp.size() >= 2 && vchTmp.end()[-1] == 0 && vchTmp.end()[-2] >= 0x80)
+ vchTmp.erase(vchTmp.end()-1);
+
+ // Restore leading zeros
+ int nLeadingZeros = 0;
+ for (const char* p = psz; *p == pszBase58[0]; p++)
+ nLeadingZeros++;
+ vchRet.assign(nLeadingZeros + vchTmp.size(), 0);
+
+ // Convert little endian data to big endian
+ reverse_copy(vchTmp.begin(), vchTmp.end(), vchRet.end() - vchTmp.size());
+ return true;
+}
+
+// Decode a base58-encoded string str into byte vector vchRet
+// returns true if decoding is successful
+bool DecodeBase58(const std::string& str, std::vector<unsigned char>& vchRet)
+{
+ return DecodeBase58(str.c_str(), vchRet);
+}
+
+// Encode a byte vector to a base58-encoded string, including checksum
+std::string EncodeBase58Check(const std::vector<unsigned char>& vchIn)
+{
+ // add 4-byte hash check to the end
+ std::vector<unsigned char> vch(vchIn);
+ uint256 hash = Hash(vch.begin(), vch.end());
+ vch.insert(vch.end(), (unsigned char*)&hash, (unsigned char*)&hash + 4);
+ return EncodeBase58(vch);
+}
+
+// Decode a base58-encoded string psz that includes a checksum, into byte vector vchRet
+// returns true if decoding is successful
+bool DecodeBase58Check(const char* psz, std::vector<unsigned char>& vchRet)
+{
+ if (!DecodeBase58(psz, vchRet))
+ return false;
+ if (vchRet.size() < 4)
+ {
+ vchRet.clear();
+ return false;
+ }
+ uint256 hash = Hash(vchRet.begin(), vchRet.end()-4);
+ if (memcmp(&hash, &vchRet.end()[-4], 4) != 0)
+ {
+ vchRet.clear();
+ return false;
+ }
+ vchRet.resize(vchRet.size()-4);
+ return true;
+}
+
+// Decode a base58-encoded string str that includes a checksum, into byte vector vchRet
+// returns true if decoding is successful
+bool DecodeBase58Check(const std::string& str, std::vector<unsigned char>& vchRet)
+{
+ return DecodeBase58Check(str.c_str(), vchRet);
+}
+
+ CBase58Data::CBase58Data()
+ {
+ nVersion = 0;
+ vchData.clear();
+ }
+
+ CBase58Data::~CBase58Data()
+ {
+ // zero the memory, as it may contain sensitive data
+ if (!vchData.empty())
+ OPENSSL_cleanse(&vchData[0], vchData.size());
+ }
+
+ void CBase58Data::SetData(int nVersionIn, const void* pdata, size_t nSize)
+ {
+ nVersion = nVersionIn;
+ vchData.resize(nSize);
+ if (!vchData.empty())
+ memcpy(&vchData[0], pdata, nSize);
+ }
+
+ void CBase58Data::SetData(int nVersionIn, const unsigned char *pbegin, const unsigned char *pend)
+ {
+ SetData(nVersionIn, (void*)pbegin, pend - pbegin);
+ }
+
+ bool CBase58Data::SetString(const char* psz)
+ {
+ std::vector<unsigned char> vchTemp;
+ DecodeBase58Check(psz, vchTemp);
+ if (vchTemp.empty())
+ {
+ vchData.clear();
+ nVersion = 0;
+ return false;
+ }
+ nVersion = vchTemp[0];
+ vchData.resize(vchTemp.size() - 1);
+ if (!vchData.empty())
+ memcpy(&vchData[0], &vchTemp[1], vchData.size());
+ OPENSSL_cleanse(&vchTemp[0], vchData.size());
+ return true;
+ }
+
+ bool CBase58Data::SetString(const std::string& str)
+ {
+ return SetString(str.c_str());
+ }
+
+ std::string CBase58Data::ToString() const
+ {
+ std::vector<unsigned char> vch(1, nVersion);
+ vch.insert(vch.end(), vchData.begin(), vchData.end());
+ return EncodeBase58Check(vch);
+ }
+
+ int CBase58Data::CompareTo(const CBase58Data& b58) const
+ {
+ if (nVersion < b58.nVersion) return -1;
+ if (nVersion > b58.nVersion) return 1;
+ if (vchData < b58.vchData) return -1;
+ if (vchData > b58.vchData) return 1;
+ return 0;
+ }
+
+ bool CBitcoinAddress::Set(const CKeyID &id) {
+ SetData(fTestNet ? PUBKEY_ADDRESS_TEST : PUBKEY_ADDRESS, &id, 20);
+ return true;
+ }
+
+ bool CBitcoinAddress::Set(const CScriptID &id) {
+ SetData(fTestNet ? SCRIPT_ADDRESS_TEST : SCRIPT_ADDRESS, &id, 20);
+ return true;
+ }
+
+ bool CBitcoinAddress::Set(const CTxDestination &dest)
+ {
+ return boost::apply_visitor(CBitcoinAddressVisitor(this), dest);
+ }
+
+ bool CBitcoinAddress::IsValid() const
+ {
+ unsigned int nExpectedSize = 20;
+ bool fExpectTestNet = false;
+ switch(nVersion)
+ {
+ case PUBKEY_ADDRESS:
+ nExpectedSize = 20; // Hash of public key
+ fExpectTestNet = false;
+ break;
+ case SCRIPT_ADDRESS:
+ nExpectedSize = 20; // Hash of CScript
+ fExpectTestNet = false;
+ break;
+
+ case PUBKEY_ADDRESS_TEST:
+ nExpectedSize = 20;
+ fExpectTestNet = true;
+ break;
+ case SCRIPT_ADDRESS_TEST:
+ nExpectedSize = 20;
+ fExpectTestNet = true;
+ break;
+
+ default:
+ return false;
+ }
+ return fExpectTestNet == fTestNet && vchData.size() == nExpectedSize;
+ }
+
+ CTxDestination CBitcoinAddress::Get() const {
+ if (!IsValid())
+ return CNoDestination();
+ switch (nVersion) {
+ case PUBKEY_ADDRESS:
+ case PUBKEY_ADDRESS_TEST: {
+ uint160 id;
+ memcpy(&id, &vchData[0], 20);
+ return CKeyID(id);
+ }
+ case SCRIPT_ADDRESS:
+ case SCRIPT_ADDRESS_TEST: {
+ uint160 id;
+ memcpy(&id, &vchData[0], 20);
+ return CScriptID(id);
+ }
+ }
+ return CNoDestination();
+ }
+
+ bool CBitcoinAddress::GetKeyID(CKeyID &keyID) const {
+ if (!IsValid())
+ return false;
+ switch (nVersion) {
+ case PUBKEY_ADDRESS:
+ case PUBKEY_ADDRESS_TEST: {
+ uint160 id;
+ memcpy(&id, &vchData[0], 20);
+ keyID = CKeyID(id);
+ return true;
+ }
+ default: return false;
+ }
+ }
+
+ bool CBitcoinAddress::IsScript() const {
+ if (!IsValid())
+ return false;
+ switch (nVersion) {
+ case SCRIPT_ADDRESS:
+ case SCRIPT_ADDRESS_TEST: {
+ return true;
+ }
+ default: return false;
+ }
+ }
+
+ void CBitcoinSecret::SetSecret(const CSecret& vchSecret, bool fCompressed)
+ {
+ assert(vchSecret.size() == 32);
+ SetData(128 + (fTestNet ? CBitcoinAddress::PUBKEY_ADDRESS_TEST : CBitcoinAddress::PUBKEY_ADDRESS), &vchSecret[0], vchSecret.size());
+ if (fCompressed)
+ vchData.push_back(1);
+ }
+
+ CSecret CBitcoinSecret::GetSecret(bool &fCompressedOut)
+ {
+ CSecret vchSecret;
+ vchSecret.resize(32);
+ memcpy(&vchSecret[0], &vchData[0], 32);
+ fCompressedOut = vchData.size() == 33;
+ return vchSecret;
+ }
+
+ bool CBitcoinSecret::IsValid() const
+ {
+ bool fExpectTestNet = false;
+ switch(nVersion)
+ {
+ case (128 + CBitcoinAddress::PUBKEY_ADDRESS):
+ break;
+
+ case (128 + CBitcoinAddress::PUBKEY_ADDRESS_TEST):
+ fExpectTestNet = true;
+ break;
+
+ default:
+ return false;
+ }
+ return fExpectTestNet == fTestNet && (vchData.size() == 32 || (vchData.size() == 33 && vchData[32] == 1));
+ }
+
+ bool CBitcoinSecret::SetString(const char* pszSecret)
+ {
+ return CBase58Data::SetString(pszSecret) && IsValid();
+ }
+
+ bool CBitcoinSecret::SetString(const std::string& strSecret)
+ {
+ return SetString(strSecret.c_str());
+ }
+
+ CBitcoinSecret::CBitcoinSecret(const CSecret& vchSecret, bool fCompressed)
+ {
+ SetSecret(vchSecret, fCompressed);
+ }
+
+
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