src/base58.h

   1 // Copyright (c) 2009-2010 Satoshi Nakamoto
   2 // Copyright (c) 2009-2015 The Bitcoin Core developers
   3 // Distributed under the MIT software license, see the accompanying
   4 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   5
   6 /**
   7  * Why base-58 instead of standard base-64 encoding?
   8  * - Don't want 0OIl characters that look the same in some fonts and
   9  *      could be used to create visually identical looking data.
  10  * - A string with non-alphanumeric characters is not as easily accepted as input.
  11  * - E-mail usually won't line-break if there's no punctuation to break at.
  12  * - Double-clicking selects the whole string as one word if it's all alphanumeric.
  13  */
  14 #ifndef BITCOIN_BASE58_H
  15 #define BITCOIN_BASE58_H
  16
  17 #include "chainparams.h"
  18 #include "key.h"
  19 #include "pubkey.h"
  20 #include "script/script.h"
  21 #include "script/standard.h"
  22 #include "support/allocators/zeroafterfree.h"
  23
  24 #include <string>
  25 #include <vector>
  26
  27 /**
  28  * Encode a byte sequence as a base58-encoded string.
  29  * pbegin and pend cannot be nullptr, unless both are.
  30  */
  31 std::string EncodeBase58(const unsigned char* pbegin, const unsigned char* pend);
  32
  33 /**
  34  * Encode a byte vector as a base58-encoded string
  35  */
  36 std::string EncodeBase58(const std::vector<unsigned char>& vch);
  37
  38 /**
  39  * Decode a base58-encoded string (psz) into a byte vector (vchRet).
  40  * return true if decoding is successful.
  41  * psz cannot be nullptr.
  42  */
  43 bool DecodeBase58(const char* psz, std::vector<unsigned char>& vchRet);
  44
  45 /**
  46  * Decode a base58-encoded string (str) into a byte vector (vchRet).
  47  * return true if decoding is successful.
  48  */
  49 bool DecodeBase58(const std::string& str, std::vector<unsigned char>& vchRet);
  50
  51 /**
  52  * Encode a byte vector into a base58-encoded string, including checksum
  53  */
  54 std::string EncodeBase58Check(const std::vector<unsigned char>& vchIn);
  55
  56 /**
  57  * Decode a base58-encoded string (psz) that includes a checksum into a byte
  58  * vector (vchRet), return true if decoding is successful
  59  */
  60 inline bool DecodeBase58Check(const char* psz, std::vector<unsigned char>& vchRet);
  61
  62 /**
  63  * Decode a base58-encoded string (str) that includes a checksum into a byte
  64  * vector (vchRet), return true if decoding is successful
  65  */
  66 inline bool DecodeBase58Check(const std::string& str, std::vector<unsigned char>& vchRet);
  67
  68 /**
  69  * Base class for all base58-encoded data
  70  */
  71 class CBase58Data
  72 {
  73 protected:
  74     //! the version byte(s)
  75     std::vector<unsigned char> vchVersion;
  76
  77     //! the actually encoded data
  78     typedef std::vector<unsigned char, zero_after_free_allocator<unsigned char> > vector_uchar;
  79     vector_uchar vchData;
  80
  81     CBase58Data();
  82     void SetData(const std::vector<unsigned char> &vchVersionIn, const void* pdata, size_t nSize);
  83     void SetData(const std::vector<unsigned char> &vchVersionIn, const unsigned char *pbegin, const unsigned char *pend);
  84
  85 public:
  86     bool SetString(const char* psz, unsigned int nVersionBytes = 1);
  87     bool SetString(const std::string& str);
  88     std::string ToString() const;
  89     int CompareTo(const CBase58Data& b58) const;
  90
  91     bool operator==(const CBase58Data& b58) const { return CompareTo(b58) == 0; }
  92     bool operator<=(const CBase58Data& b58) const { return CompareTo(b58) <= 0; }
  93     bool operator>=(const CBase58Data& b58) const { return CompareTo(b58) >= 0; }
  94     bool operator< (const CBase58Data& b58) const { return CompareTo(b58) <  0; }
  95     bool operator> (const CBase58Data& b58) const { return CompareTo(b58) >  0; }
  96 };
  97
  98 /**
  99  * A base58-encoded secret key
 100  */
 101 class CBitcoinSecret : public CBase58Data
 102 {
 103 public:
 104     void SetKey(const CKey& vchSecret);
 105     CKey GetKey();
 106     bool IsValid() const;
 107     bool SetString(const char* pszSecret);
 108     bool SetString(const std::string& strSecret);
 109
 110     CBitcoinSecret(const CKey& vchSecret) { SetKey(vchSecret); }
 111     CBitcoinSecret() {}
 112 };
 113
 114 template<typename K, int Size, CChainParams::Base58Type Type> class CBitcoinExtKeyBase : public CBase58Data
 115 {
 116 public:
 117     void SetKey(const K &key) {
 118         unsigned char vch[Size];
 119         key.Encode(vch);
 120         SetData(Params().Base58Prefix(Type), vch, vch+Size);
 121     }
 122
 123     K GetKey() {
 124         K ret;
 125         if (vchData.size() == Size) {
 126             // If base58 encoded data does not hold an ext key, return a !IsValid() key
 127             ret.Decode(vchData.data());
 128         }
 129         return ret;
 130     }
 131
 132     CBitcoinExtKeyBase(const K &key) {
 133         SetKey(key);
 134     }
 135
 136     CBitcoinExtKeyBase(const std::string& strBase58c) {
 137         SetString(strBase58c.c_str(), Params().Base58Prefix(Type).size());
 138     }
 139
 140     CBitcoinExtKeyBase() {}
 141 };
 142
 143 typedef CBitcoinExtKeyBase<CExtKey, BIP32_EXTKEY_SIZE, CChainParams::EXT_SECRET_KEY> CBitcoinExtKey;
 144 typedef CBitcoinExtKeyBase<CExtPubKey, BIP32_EXTKEY_SIZE, CChainParams::EXT_PUBLIC_KEY> CBitcoinExtPubKey;
 145
 146 std::string EncodeDestination(const CTxDestination& dest);
 147 CTxDestination DecodeDestination(const std::string& str);
 148 bool IsValidDestinationString(const std::string& str);
 149 bool IsValidDestinationString(const std::string& str, const CChainParams& params);
 150
 151 #endif // BITCOIN_BASE58_H