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-rw-r--r--src/bignum.h532
1 files changed, 532 insertions, 0 deletions
diff --git a/src/bignum.h b/src/bignum.h
new file mode 100644
index 0000000000..450e809d3d
--- /dev/null
+++ b/src/bignum.h
@@ -0,0 +1,532 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Distributed under the MIT/X11 software license, see the accompanying
+// file license.txt or http://www.opensource.org/licenses/mit-license.php.
+
+#include <stdexcept>
+#include <vector>
+#include <openssl/bn.h>
+
+
+
+
+
+class bignum_error : public std::runtime_error
+{
+public:
+ explicit bignum_error(const std::string& str) : std::runtime_error(str) {}
+};
+
+
+
+class CAutoBN_CTX
+{
+protected:
+ BN_CTX* pctx;
+ BN_CTX* operator=(BN_CTX* pnew) { return pctx = pnew; }
+
+public:
+ CAutoBN_CTX()
+ {
+ pctx = BN_CTX_new();
+ if (pctx == NULL)
+ throw bignum_error("CAutoBN_CTX : BN_CTX_new() returned NULL");
+ }
+
+ ~CAutoBN_CTX()
+ {
+ if (pctx != NULL)
+ BN_CTX_free(pctx);
+ }
+
+ operator BN_CTX*() { return pctx; }
+ BN_CTX& operator*() { return *pctx; }
+ BN_CTX** operator&() { return &pctx; }
+ bool operator!() { return (pctx == NULL); }
+};
+
+
+
+class CBigNum : public BIGNUM
+{
+public:
+ CBigNum()
+ {
+ BN_init(this);
+ }
+
+ CBigNum(const CBigNum& b)
+ {
+ BN_init(this);
+ if (!BN_copy(this, &b))
+ {
+ BN_clear_free(this);
+ throw bignum_error("CBigNum::CBigNum(const CBigNum&) : BN_copy failed");
+ }
+ }
+
+ CBigNum& operator=(const CBigNum& b)
+ {
+ if (!BN_copy(this, &b))
+ throw bignum_error("CBigNum::operator= : BN_copy failed");
+ return (*this);
+ }
+
+ ~CBigNum()
+ {
+ BN_clear_free(this);
+ }
+
+ CBigNum(char n) { BN_init(this); if (n >= 0) setulong(n); else setint64(n); }
+ CBigNum(short n) { BN_init(this); if (n >= 0) setulong(n); else setint64(n); }
+ CBigNum(int n) { BN_init(this); if (n >= 0) setulong(n); else setint64(n); }
+ CBigNum(long n) { BN_init(this); if (n >= 0) setulong(n); else setint64(n); }
+ CBigNum(int64 n) { BN_init(this); setint64(n); }
+ CBigNum(unsigned char n) { BN_init(this); setulong(n); }
+ CBigNum(unsigned short n) { BN_init(this); setulong(n); }
+ CBigNum(unsigned int n) { BN_init(this); setulong(n); }
+ CBigNum(unsigned long n) { BN_init(this); setulong(n); }
+ CBigNum(uint64 n) { BN_init(this); setuint64(n); }
+ explicit CBigNum(uint256 n) { BN_init(this); setuint256(n); }
+
+ explicit CBigNum(const std::vector<unsigned char>& vch)
+ {
+ BN_init(this);
+ setvch(vch);
+ }
+
+ void setulong(unsigned long n)
+ {
+ if (!BN_set_word(this, n))
+ throw bignum_error("CBigNum conversion from unsigned long : BN_set_word failed");
+ }
+
+ unsigned long getulong() const
+ {
+ return BN_get_word(this);
+ }
+
+ unsigned int getuint() const
+ {
+ return BN_get_word(this);
+ }
+
+ int getint() const
+ {
+ unsigned long n = BN_get_word(this);
+ if (!BN_is_negative(this))
+ return (n > INT_MAX ? INT_MAX : n);
+ else
+ return (n > INT_MAX ? INT_MIN : -(int)n);
+ }
+
+ void setint64(int64 n)
+ {
+ unsigned char pch[sizeof(n) + 6];
+ unsigned char* p = pch + 4;
+ bool fNegative = false;
+ if (n < (int64)0)
+ {
+ n = -n;
+ fNegative = true;
+ }
+ bool fLeadingZeroes = true;
+ for (int i = 0; i < 8; i++)
+ {
+ unsigned char c = (n >> 56) & 0xff;
+ n <<= 8;
+ if (fLeadingZeroes)
+ {
+ if (c == 0)
+ continue;
+ if (c & 0x80)
+ *p++ = (fNegative ? 0x80 : 0);
+ else if (fNegative)
+ c |= 0x80;
+ fLeadingZeroes = false;
+ }
+ *p++ = c;
+ }
+ unsigned int nSize = p - (pch + 4);
+ pch[0] = (nSize >> 24) & 0xff;
+ pch[1] = (nSize >> 16) & 0xff;
+ pch[2] = (nSize >> 8) & 0xff;
+ pch[3] = (nSize) & 0xff;
+ BN_mpi2bn(pch, p - pch, this);
+ }
+
+ void setuint64(uint64 n)
+ {
+ unsigned char pch[sizeof(n) + 6];
+ unsigned char* p = pch + 4;
+ bool fLeadingZeroes = true;
+ for (int i = 0; i < 8; i++)
+ {
+ unsigned char c = (n >> 56) & 0xff;
+ n <<= 8;
+ if (fLeadingZeroes)
+ {
+ if (c == 0)
+ continue;
+ if (c & 0x80)
+ *p++ = 0;
+ fLeadingZeroes = false;
+ }
+ *p++ = c;
+ }
+ unsigned int nSize = p - (pch + 4);
+ pch[0] = (nSize >> 24) & 0xff;
+ pch[1] = (nSize >> 16) & 0xff;
+ pch[2] = (nSize >> 8) & 0xff;
+ pch[3] = (nSize) & 0xff;
+ BN_mpi2bn(pch, p - pch, this);
+ }
+
+ void setuint256(uint256 n)
+ {
+ unsigned char pch[sizeof(n) + 6];
+ unsigned char* p = pch + 4;
+ bool fLeadingZeroes = true;
+ unsigned char* pbegin = (unsigned char*)&n;
+ unsigned char* psrc = pbegin + sizeof(n);
+ while (psrc != pbegin)
+ {
+ unsigned char c = *(--psrc);
+ if (fLeadingZeroes)
+ {
+ if (c == 0)
+ continue;
+ if (c & 0x80)
+ *p++ = 0;
+ fLeadingZeroes = false;
+ }
+ *p++ = c;
+ }
+ unsigned int nSize = p - (pch + 4);
+ pch[0] = (nSize >> 24) & 0xff;
+ pch[1] = (nSize >> 16) & 0xff;
+ pch[2] = (nSize >> 8) & 0xff;
+ pch[3] = (nSize >> 0) & 0xff;
+ BN_mpi2bn(pch, p - pch, this);
+ }
+
+ uint256 getuint256()
+ {
+ unsigned int nSize = BN_bn2mpi(this, NULL);
+ if (nSize < 4)
+ return 0;
+ std::vector<unsigned char> vch(nSize);
+ BN_bn2mpi(this, &vch[0]);
+ if (vch.size() > 4)
+ vch[4] &= 0x7f;
+ uint256 n = 0;
+ for (int i = 0, j = vch.size()-1; i < sizeof(n) && j >= 4; i++, j--)
+ ((unsigned char*)&n)[i] = vch[j];
+ return n;
+ }
+
+ void setvch(const std::vector<unsigned char>& vch)
+ {
+ std::vector<unsigned char> vch2(vch.size() + 4);
+ unsigned int nSize = vch.size();
+ vch2[0] = (nSize >> 24) & 0xff;
+ vch2[1] = (nSize >> 16) & 0xff;
+ vch2[2] = (nSize >> 8) & 0xff;
+ vch2[3] = (nSize >> 0) & 0xff;
+ reverse_copy(vch.begin(), vch.end(), vch2.begin() + 4);
+ BN_mpi2bn(&vch2[0], vch2.size(), this);
+ }
+
+ std::vector<unsigned char> getvch() const
+ {
+ unsigned int nSize = BN_bn2mpi(this, NULL);
+ if (nSize < 4)
+ return std::vector<unsigned char>();
+ std::vector<unsigned char> vch(nSize);
+ BN_bn2mpi(this, &vch[0]);
+ vch.erase(vch.begin(), vch.begin() + 4);
+ reverse(vch.begin(), vch.end());
+ return vch;
+ }
+
+ CBigNum& SetCompact(unsigned int nCompact)
+ {
+ unsigned int nSize = nCompact >> 24;
+ std::vector<unsigned char> vch(4 + nSize);
+ vch[3] = nSize;
+ if (nSize >= 1) vch[4] = (nCompact >> 16) & 0xff;
+ if (nSize >= 2) vch[5] = (nCompact >> 8) & 0xff;
+ if (nSize >= 3) vch[6] = (nCompact >> 0) & 0xff;
+ BN_mpi2bn(&vch[0], vch.size(), this);
+ return *this;
+ }
+
+ unsigned int GetCompact() const
+ {
+ unsigned int nSize = BN_bn2mpi(this, NULL);
+ std::vector<unsigned char> vch(nSize);
+ nSize -= 4;
+ BN_bn2mpi(this, &vch[0]);
+ unsigned int nCompact = nSize << 24;
+ if (nSize >= 1) nCompact |= (vch[4] << 16);
+ if (nSize >= 2) nCompact |= (vch[5] << 8);
+ if (nSize >= 3) nCompact |= (vch[6] << 0);
+ return nCompact;
+ }
+
+ void SetHex(const std::string& str)
+ {
+ // skip 0x
+ const char* psz = str.c_str();
+ while (isspace(*psz))
+ psz++;
+ bool fNegative = false;
+ if (*psz == '-')
+ {
+ fNegative = true;
+ psz++;
+ }
+ if (psz[0] == '0' && tolower(psz[1]) == 'x')
+ psz += 2;
+ while (isspace(*psz))
+ psz++;
+
+ // hex string to bignum
+ static char phexdigit[256] = { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,1,2,3,4,5,6,7,8,9,0,0,0,0,0,0, 0,0xa,0xb,0xc,0xd,0xe,0xf,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0xa,0xb,0xc,0xd,0xe,0xf,0,0,0,0,0,0,0,0,0 };
+ *this = 0;
+ while (isxdigit(*psz))
+ {
+ *this <<= 4;
+ int n = phexdigit[*psz++];
+ *this += n;
+ }
+ if (fNegative)
+ *this = 0 - *this;
+ }
+
+ std::string ToString(int nBase=10) const
+ {
+ CAutoBN_CTX pctx;
+ CBigNum bnBase = nBase;
+ CBigNum bn0 = 0;
+ string str;
+ CBigNum bn = *this;
+ BN_set_negative(&bn, false);
+ CBigNum dv;
+ CBigNum rem;
+ if (BN_cmp(&bn, &bn0) == 0)
+ return "0";
+ while (BN_cmp(&bn, &bn0) > 0)
+ {
+ if (!BN_div(&dv, &rem, &bn, &bnBase, pctx))
+ throw bignum_error("CBigNum::ToString() : BN_div failed");
+ bn = dv;
+ unsigned int c = rem.getulong();
+ str += "0123456789abcdef"[c];
+ }
+ if (BN_is_negative(this))
+ str += "-";
+ reverse(str.begin(), str.end());
+ return str;
+ }
+
+ std::string GetHex() const
+ {
+ return ToString(16);
+ }
+
+ unsigned int GetSerializeSize(int nType=0, int nVersion=VERSION) const
+ {
+ return ::GetSerializeSize(getvch(), nType, nVersion);
+ }
+
+ template<typename Stream>
+ void Serialize(Stream& s, int nType=0, int nVersion=VERSION) const
+ {
+ ::Serialize(s, getvch(), nType, nVersion);
+ }
+
+ template<typename Stream>
+ void Unserialize(Stream& s, int nType=0, int nVersion=VERSION)
+ {
+ vector<unsigned char> vch;
+ ::Unserialize(s, vch, nType, nVersion);
+ setvch(vch);
+ }
+
+
+ bool operator!() const
+ {
+ return BN_is_zero(this);
+ }
+
+ CBigNum& operator+=(const CBigNum& b)
+ {
+ if (!BN_add(this, this, &b))
+ throw bignum_error("CBigNum::operator+= : BN_add failed");
+ return *this;
+ }
+
+ CBigNum& operator-=(const CBigNum& b)
+ {
+ *this = *this - b;
+ return *this;
+ }
+
+ CBigNum& operator*=(const CBigNum& b)
+ {
+ CAutoBN_CTX pctx;
+ if (!BN_mul(this, this, &b, pctx))
+ throw bignum_error("CBigNum::operator*= : BN_mul failed");
+ return *this;
+ }
+
+ CBigNum& operator/=(const CBigNum& b)
+ {
+ *this = *this / b;
+ return *this;
+ }
+
+ CBigNum& operator%=(const CBigNum& b)
+ {
+ *this = *this % b;
+ return *this;
+ }
+
+ CBigNum& operator<<=(unsigned int shift)
+ {
+ if (!BN_lshift(this, this, shift))
+ throw bignum_error("CBigNum:operator<<= : BN_lshift failed");
+ return *this;
+ }
+
+ CBigNum& operator>>=(unsigned int shift)
+ {
+ // Note: BN_rshift segfaults on 64-bit if 2^shift is greater than the number
+ // if built on ubuntu 9.04 or 9.10, probably depends on version of openssl
+ CBigNum a = 1;
+ a <<= shift;
+ if (BN_cmp(&a, this) > 0)
+ {
+ *this = 0;
+ return *this;
+ }
+
+ if (!BN_rshift(this, this, shift))
+ throw bignum_error("CBigNum:operator>>= : BN_rshift failed");
+ return *this;
+ }
+
+
+ CBigNum& operator++()
+ {
+ // prefix operator
+ if (!BN_add(this, this, BN_value_one()))
+ throw bignum_error("CBigNum::operator++ : BN_add failed");
+ return *this;
+ }
+
+ const CBigNum operator++(int)
+ {
+ // postfix operator
+ const CBigNum ret = *this;
+ ++(*this);
+ return ret;
+ }
+
+ CBigNum& operator--()
+ {
+ // prefix operator
+ CBigNum r;
+ if (!BN_sub(&r, this, BN_value_one()))
+ throw bignum_error("CBigNum::operator-- : BN_sub failed");
+ *this = r;
+ return *this;
+ }
+
+ const CBigNum operator--(int)
+ {
+ // postfix operator
+ const CBigNum ret = *this;
+ --(*this);
+ return ret;
+ }
+
+
+ friend inline const CBigNum operator-(const CBigNum& a, const CBigNum& b);
+ friend inline const CBigNum operator/(const CBigNum& a, const CBigNum& b);
+ friend inline const CBigNum operator%(const CBigNum& a, const CBigNum& b);
+};
+
+
+
+inline const CBigNum operator+(const CBigNum& a, const CBigNum& b)
+{
+ CBigNum r;
+ if (!BN_add(&r, &a, &b))
+ throw bignum_error("CBigNum::operator+ : BN_add failed");
+ return r;
+}
+
+inline const CBigNum operator-(const CBigNum& a, const CBigNum& b)
+{
+ CBigNum r;
+ if (!BN_sub(&r, &a, &b))
+ throw bignum_error("CBigNum::operator- : BN_sub failed");
+ return r;
+}
+
+inline const CBigNum operator-(const CBigNum& a)
+{
+ CBigNum r(a);
+ BN_set_negative(&r, !BN_is_negative(&r));
+ return r;
+}
+
+inline const CBigNum operator*(const CBigNum& a, const CBigNum& b)
+{
+ CAutoBN_CTX pctx;
+ CBigNum r;
+ if (!BN_mul(&r, &a, &b, pctx))
+ throw bignum_error("CBigNum::operator* : BN_mul failed");
+ return r;
+}
+
+inline const CBigNum operator/(const CBigNum& a, const CBigNum& b)
+{
+ CAutoBN_CTX pctx;
+ CBigNum r;
+ if (!BN_div(&r, NULL, &a, &b, pctx))
+ throw bignum_error("CBigNum::operator/ : BN_div failed");
+ return r;
+}
+
+inline const CBigNum operator%(const CBigNum& a, const CBigNum& b)
+{
+ CAutoBN_CTX pctx;
+ CBigNum r;
+ if (!BN_mod(&r, &a, &b, pctx))
+ throw bignum_error("CBigNum::operator% : BN_div failed");
+ return r;
+}
+
+inline const CBigNum operator<<(const CBigNum& a, unsigned int shift)
+{
+ CBigNum r;
+ if (!BN_lshift(&r, &a, shift))
+ throw bignum_error("CBigNum:operator<< : BN_lshift failed");
+ return r;
+}
+
+inline const CBigNum operator>>(const CBigNum& a, unsigned int shift)
+{
+ CBigNum r = a;
+ r >>= shift;
+ return r;
+}
+
+inline bool operator==(const CBigNum& a, const CBigNum& b) { return (BN_cmp(&a, &b) == 0); }
+inline bool operator!=(const CBigNum& a, const CBigNum& b) { return (BN_cmp(&a, &b) != 0); }
+inline bool operator<=(const CBigNum& a, const CBigNum& b) { return (BN_cmp(&a, &b) <= 0); }
+inline bool operator>=(const CBigNum& a, const CBigNum& b) { return (BN_cmp(&a, &b) >= 0); }
+inline bool operator<(const CBigNum& a, const CBigNum& b) { return (BN_cmp(&a, &b) < 0); }
+inline bool operator>(const CBigNum& a, const CBigNum& b) { return (BN_cmp(&a, &b) > 0); }
generated by cgit v1.2.3 (git 2.26.2) at 2024-06-28 20:44:24 +0000