1 // Copyright (c) 2009-2010 Satoshi Nakamoto
2 // Copyright (c) 2009-2012 The Bitcoin developers
3 // Distributed under the MIT/X11 software license, see the accompanying
4 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
5 #ifndef BITCOIN_BIGNUM_H
6 #define BITCOIN_BIGNUM_H
12 #include <openssl/bn.h>
21 /** Errors thrown by the bignum class */
22 class bignum_error : public std::runtime_error
25 explicit bignum_error(const std::string& str) : std::runtime_error(str) {}
29 /** RAII encapsulated BN_CTX (OpenSSL bignum context) */
34 BN_CTX* operator=(BN_CTX* pnew) { return pctx = pnew; }
40 operator BN_CTX*() { return pctx; }
41 BN_CTX& operator*() { return *pctx; }
42 BN_CTX** operator&() { return &pctx; }
43 bool operator!() { return (pctx == NULL); }
47 /** C++ wrapper for BIGNUM (OpenSSL bignum) */
54 CBigNum(const CBigNum& b);
55 CBigNum& operator=(const CBigNum& b);
56 CBigNum(const BIGNUM *bnp);
60 CBigNum(bool n) { bn = BN_new(); setuint32(n); }
62 CBigNum(int8_t n) { bn = BN_new(); if (n >= 0) setuint32(n); else setint64(n); }
63 CBigNum(int16_t n) { bn = BN_new(); if (n >= 0) setuint32(n); else setint64(n); }
64 CBigNum(int32_t n) { bn = BN_new(); if (n >= 0) setuint32(n); else setint64(n); }
65 CBigNum(int64_t n) { bn = BN_new(); if (n >= 0) setuint64(n); else setint64(n); }
67 CBigNum(uint8_t n) { bn = BN_new(); setuint32(n); }
68 CBigNum(uint16_t n) { bn = BN_new(); setuint32(n); }
69 CBigNum(uint32_t n) { bn = BN_new(); setuint32(n); }
70 CBigNum(uint64_t n) { bn = BN_new(); setuint64(n); }
72 explicit CBigNum(uint256 n);
73 explicit CBigNum(const std::vector<uint8_t>& vch) { bn = BN_new(); setvch(vch); }
75 void setuint32(uint32_t n);
76 uint32_t getuint32() const;
77 int32_t getint32() const;
78 void setint64(int64_t sn);
81 //supress msvc C4127: conditional expression is constant
82 inline bool check(bool value) {return value;}
84 void setuint64(uint64_t n);
85 void setuint160(uint160 n);
86 uint160 getuint160() const;
87 void setuint256(uint256 n);
88 uint256 getuint256() const;
89 void setBytes(const std::vector<uint8_t>& vchBytes);
90 std::vector<uint8_t> getBytes() const;
91 void setvch(const std::vector<uint8_t>& vch);
92 std::vector<uint8_t> getvch() const;
93 CBigNum& SetCompact(uint32_t nCompact);
94 uint32_t GetCompact() const;
95 void SetHex(const std::string& str);
96 std::string ToString(int nBase=10) const;
97 std::string GetHex() const { return ToString(16); }
98 BIGNUM* get() const { return BN_dup(bn); }
100 unsigned int GetSerializeSize(int nType=0, int nVersion=PROTOCOL_VERSION) const
102 return ::GetSerializeSize(getvch(), nType, nVersion);
105 template<typename Stream>
106 void Serialize(Stream& s, int nType=0, int nVersion=PROTOCOL_VERSION) const
108 ::Serialize(s, getvch(), nType, nVersion);
111 template<typename Stream>
112 void Unserialize(Stream& s, int nType=0, int nVersion=PROTOCOL_VERSION)
114 std::vector<uint8_t> vch;
115 ::Unserialize(s, vch, nType, nVersion);
119 bool operator!() const;
121 CBigNum& operator+=(const CBigNum& b);
122 CBigNum& operator-=(const CBigNum& b);
123 CBigNum& operator*=(const CBigNum& b);
124 CBigNum& operator/=(const CBigNum& b);
125 CBigNum& operator%=(const CBigNum& b);
126 CBigNum& operator<<=(unsigned int shift);
127 CBigNum& operator>>=(unsigned int shift);
128 CBigNum& operator++();
129 const CBigNum operator++(int);
130 CBigNum& operator--();
131 const CBigNum operator--(int);
133 friend inline const CBigNum operator-(const CBigNum& a, const CBigNum& b);
134 friend inline const CBigNum operator/(const CBigNum& a, const CBigNum& b);
135 friend inline const CBigNum operator%(const CBigNum& a, const CBigNum& b);
136 friend inline const CBigNum operator*(const CBigNum& a, const CBigNum& b);
137 friend inline const CBigNum operator+(const CBigNum& a, const CBigNum& b);
138 friend inline const CBigNum operator*(const CBigNum& a);
140 friend inline const CBigNum operator-(const CBigNum& a);
141 friend inline const CBigNum operator<<(const CBigNum& a, unsigned int shift);
143 friend inline bool operator==(const CBigNum& a, const CBigNum& b);
144 friend inline bool operator!=(const CBigNum& a, const CBigNum& b);
145 friend inline bool operator<=(const CBigNum& a, const CBigNum& b);
146 friend inline bool operator>=(const CBigNum& a, const CBigNum& b);
147 friend inline bool operator<(const CBigNum& a, const CBigNum& b);
148 friend inline bool operator>(const CBigNum& a, const CBigNum& b);
149 friend inline std::ostream& operator<<(std::ostream &strm, const CBigNum &b);
153 inline const CBigNum operator+(const CBigNum& a, const CBigNum& b)
156 if (!BN_add(r.bn, a.bn, b.bn))
157 throw bignum_error("CBigNum::operator+ : BN_add failed");
161 inline const CBigNum operator-(const CBigNum& a, const CBigNum& b)
164 if (!BN_sub(r.bn, a.bn, b.bn))
165 throw bignum_error("CBigNum::operator- : BN_sub failed");
169 inline const CBigNum operator-(const CBigNum& a)
172 BN_set_negative(r.bn, !BN_is_negative(r.bn));
176 inline const CBigNum operator*(const CBigNum& a, const CBigNum& b)
180 if (!BN_mul(r.bn, a.bn, b.bn, pctx))
181 throw bignum_error("CBigNum::operator* : BN_mul failed");
185 inline const CBigNum operator/(const CBigNum& a, const CBigNum& b)
189 if (!BN_div(r.bn, NULL, a.bn, b.bn, pctx))
190 throw bignum_error("CBigNum::operator/ : BN_div failed");
194 inline const CBigNum operator%(const CBigNum& a, const CBigNum& b)
198 if (!BN_nnmod(r.bn, a.bn, b.bn, pctx))
199 throw bignum_error("CBigNum::operator% : BN_div failed");
203 inline const CBigNum operator<<(const CBigNum& a, unsigned int shift)
206 if (!BN_lshift(r.bn, a.bn, shift))
207 throw bignum_error("CBigNum:operator<< : BN_lshift failed");
211 inline const CBigNum operator>>(const CBigNum& a, unsigned int shift)
218 inline bool operator==(const CBigNum& a, const CBigNum& b) { return (BN_cmp(a.bn, b.bn) == 0); }
219 inline bool operator!=(const CBigNum& a, const CBigNum& b) { return (BN_cmp(a.bn, b.bn) != 0); }
220 inline bool operator<=(const CBigNum& a, const CBigNum& b) { return (BN_cmp(a.bn, b.bn) <= 0); }
221 inline bool operator>=(const CBigNum& a, const CBigNum& b) { return (BN_cmp(a.bn, b.bn) >= 0); }
222 inline bool operator<(const CBigNum& a, const CBigNum& b) { return (BN_cmp(a.bn, b.bn) < 0); }
223 inline bool operator>(const CBigNum& a, const CBigNum& b) { return (BN_cmp(a.bn, b.bn) > 0); }
225 inline std::ostream& operator<<(std::ostream &strm, const CBigNum &b) { return strm << b.ToString(10); }