mirror of
https://github.com/XRPLF/rippled.git
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531 lines
11 KiB
C++
531 lines
11 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2011 The Bitcoin developers
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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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CBigNum::CBigNum()
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{
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BN_init(this);
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}
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CBigNum::CBigNum(const CBigNum& b)
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{
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BN_init(this);
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if (!BN_copy(this, &b))
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{
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BN_clear_free(this);
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throw bignum_error("CBigNum::CBigNum(const CBigNum&) : BN_copy failed");
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}
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}
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CBigNum& CBigNum::operator=(const CBigNum& b)
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{
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if (!BN_copy(this, &b))
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throw bignum_error("CBigNum::operator= : BN_copy failed");
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return (*this);
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}
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CBigNum::~CBigNum()
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{
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BN_clear_free(this);
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}
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CBigNum::CBigNum(char n) { BN_init(this); if (n >= 0) setulong(n); else setint64(n); }
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CBigNum::CBigNum(short n) { BN_init(this); if (n >= 0) setulong(n); else setint64(n); }
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CBigNum::CBigNum(int n) { BN_init(this); if (n >= 0) setulong(n); else setint64(n); }
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CBigNum::CBigNum(long n) { BN_init(this); if (n >= 0) setulong(n); else setint64(n); }
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CBigNum::CBigNum(int64 n) { BN_init(this); setint64(n); }
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CBigNum::CBigNum(unsigned char n) { BN_init(this); setulong(n); }
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CBigNum::CBigNum(unsigned short n) { BN_init(this); setulong(n); }
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CBigNum::CBigNum(unsigned int n) { BN_init(this); setulong(n); }
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CBigNum::CBigNum(uint64 n) { BN_init(this); setuint64(n); }
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CBigNum::CBigNum(uint256 n) { BN_init(this); setuint256(n); }
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CBigNum::CBigNum(Blob const& vch)
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{
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BN_init(this);
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setvch(vch);
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}
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void CBigNum::setuint(unsigned int n)
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{
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setulong(static_cast<unsigned long>(n));
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}
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unsigned int CBigNum::getuint() const
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{
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return BN_get_word(this);
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}
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int CBigNum::getint() const
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{
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unsigned long n = BN_get_word(this);
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if (!BN_is_negative(this))
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return (n > INT_MAX ? INT_MAX : n);
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else
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return (n > INT_MAX ? INT_MIN : -(int)n);
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}
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void CBigNum::setint64(int64 n)
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{
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unsigned char pch[sizeof(n) + 6];
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unsigned char* p = pch + 4;
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bool fNegative = false;
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if (n < (int64)0)
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{
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n = -n;
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fNegative = true;
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}
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bool fLeadingZeroes = true;
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for (int i = 0; i < 8; i++)
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{
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unsigned char c = (n >> 56) & 0xff;
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n <<= 8;
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if (fLeadingZeroes)
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{
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if (c == 0)
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continue;
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if (c & 0x80)
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*p++ = (fNegative ? 0x80 : 0);
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else if (fNegative)
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c |= 0x80;
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fLeadingZeroes = false;
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}
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*p++ = c;
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}
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unsigned int nSize = p - (pch + 4);
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pch[0] = (nSize >> 24) & 0xff;
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pch[1] = (nSize >> 16) & 0xff;
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pch[2] = (nSize >> 8) & 0xff;
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pch[3] = (nSize) & 0xff;
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BN_mpi2bn(pch, p - pch, this);
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}
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uint64 CBigNum::getuint64() const
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{
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#if (ULONG_MAX > UINT_MAX)
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return static_cast<uint64>(getulong());
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#else
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int len = BN_num_bytes(this);
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if (len > 8)
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throw std::runtime_error("BN getuint64 overflow");
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unsigned char buf[8];
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memset(buf, 0, sizeof(buf));
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BN_bn2bin(this, buf + 8 - len);
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return
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static_cast<uint64>(buf[0]) << 56 | static_cast<uint64>(buf[1]) << 48 |
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static_cast<uint64>(buf[2]) << 40 | static_cast<uint64>(buf[3]) << 32 |
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static_cast<uint64>(buf[4]) << 24 | static_cast<uint64>(buf[5]) << 16 |
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static_cast<uint64>(buf[6]) << 8 | static_cast<uint64>(buf[7]);
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#endif
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}
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void CBigNum::setuint64(uint64 n)
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{
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#if (ULONG_MAX > UINT_MAX)
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setulong(static_cast<unsigned long>(n));
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#else
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unsigned char buf[8];
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buf[0] = static_cast<unsigned char>((n >> 56) & 0xff);
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buf[1] = static_cast<unsigned char>((n >> 48) & 0xff);
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buf[2] = static_cast<unsigned char>((n >> 40) & 0xff);
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buf[3] = static_cast<unsigned char>((n >> 32) & 0xff);
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buf[4] = static_cast<unsigned char>((n >> 24) & 0xff);
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buf[5] = static_cast<unsigned char>((n >> 16) & 0xff);
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buf[6] = static_cast<unsigned char>((n >> 8) & 0xff);
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buf[7] = static_cast<unsigned char>((n) & 0xff);
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BN_bin2bn(buf, 8, this);
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#endif
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}
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void CBigNum::setuint256(const uint256& n)
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{
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BN_bin2bn(n.begin(), n.size(), NULL);
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}
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uint256 CBigNum::getuint256()
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{
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uint256 ret;
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unsigned int size = BN_num_bytes(this);
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if (size > ret.size())
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return ret;
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BN_bn2bin(this, ret.begin() + (ret.size() - BN_num_bytes(this)));
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return ret;
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}
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void CBigNum::setvch(Blob const& vch)
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{
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Blob vch2(vch.size() + 4);
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unsigned int nSize = vch.size();
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// BIGNUM's byte stream format expects 4 bytes of
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// big endian size data info at the front
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vch2[0] = (nSize >> 24) & 0xff;
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vch2[1] = (nSize >> 16) & 0xff;
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vch2[2] = (nSize >> 8) & 0xff;
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vch2[3] = (nSize >> 0) & 0xff;
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// swap data to big endian
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std::reverse_copy(vch.begin(), vch.end(), vch2.begin() + 4);
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BN_mpi2bn(&vch2[0], vch2.size(), this);
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}
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Blob CBigNum::getvch() const
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{
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unsigned int nSize = BN_bn2mpi(this, NULL);
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if (nSize < 4)
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return Blob ();
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Blob vch(nSize);
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BN_bn2mpi(this, &vch[0]);
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vch.erase(vch.begin(), vch.begin() + 4);
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reverse(vch.begin(), vch.end());
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return vch;
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}
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CBigNum& CBigNum::SetCompact(unsigned int nCompact)
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{
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unsigned int nSize = nCompact >> 24;
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Blob vch(4 + nSize);
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vch[3] = nSize;
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if (nSize >= 1) vch[4] = (nCompact >> 16) & 0xff;
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if (nSize >= 2) vch[5] = (nCompact >> 8) & 0xff;
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if (nSize >= 3) vch[6] = (nCompact >> 0) & 0xff;
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BN_mpi2bn(&vch[0], vch.size(), this);
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return *this;
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}
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unsigned int CBigNum::GetCompact() const
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{
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unsigned int nSize = BN_bn2mpi(this, NULL);
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Blob vch(nSize);
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nSize -= 4;
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BN_bn2mpi(this, &vch[0]);
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unsigned int nCompact = nSize << 24;
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if (nSize >= 1) nCompact |= (vch[4] << 16);
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if (nSize >= 2) nCompact |= (vch[5] << 8);
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if (nSize >= 3) nCompact |= (vch[6] << 0);
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return nCompact;
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}
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void CBigNum::SetHex(const std::string& str)
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{
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// skip 0x
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const char* psz = str.c_str();
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while (isspace(*psz))
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psz++;
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bool fNegative = false;
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if (*psz == '-')
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{
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fNegative = true;
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psz++;
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}
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if (psz[0] == '0' && tolower(psz[1]) == 'x')
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psz += 2;
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while (isspace(*psz))
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psz++;
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// hex string to bignum
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static char phexdigit[256] = {
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,1,2,3,4,5,6,7,8,9,0,0,0,0,0,0,
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0,0xa,0xb,0xc,0xd,0xe,0xf,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0xa,0xb,0xc,0xd,0xe,0xf,0,0,0,0,0,0,0,0,0 };
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*this = 0;
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while (isxdigit(*psz))
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{
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*this <<= 4;
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int n = phexdigit[(int) *psz++];
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*this += n;
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}
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if (fNegative)
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*this = 0 - *this;
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}
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std::string CBigNum::ToString(int nBase) const
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{
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CAutoBN_CTX pctx;
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CBigNum bnBase = nBase;
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CBigNum bn0 = 0;
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std::string str;
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CBigNum bn = *this;
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BN_set_negative(&bn, false);
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CBigNum dv;
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CBigNum rem;
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if (BN_cmp(&bn, &bn0) == 0)
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return "0";
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while (BN_cmp(&bn, &bn0) > 0)
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{
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if (!BN_div(&dv, &rem, &bn, &bnBase, pctx))
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throw bignum_error("CBigNum::ToString() : BN_div failed");
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bn = dv;
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unsigned int c = rem.getuint();
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str += "0123456789abcdef"[c];
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}
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if (BN_is_negative(this))
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str += "-";
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reverse(str.begin(), str.end());
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return str;
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}
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std::string CBigNum::GetHex() const
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{
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return ToString(16);
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}
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bool CBigNum::operator!() const
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{
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return BN_is_zero(this);
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}
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CBigNum& CBigNum::operator+=(const CBigNum& b)
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{
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if (!BN_add(this, this, &b))
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throw bignum_error("CBigNum::operator+= : BN_add failed");
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return *this;
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}
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CBigNum& CBigNum::operator-=(const CBigNum& b)
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{
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*this = *this - b;
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return *this;
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}
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CBigNum& CBigNum::operator*=(const CBigNum& b)
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{
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CAutoBN_CTX pctx;
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if (!BN_mul(this, this, &b, pctx))
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throw bignum_error("CBigNum::operator*= : BN_mul failed");
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return *this;
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}
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CBigNum& CBigNum::operator/=(const CBigNum& b)
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{
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*this = *this / b;
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return *this;
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}
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CBigNum& CBigNum::operator%=(const CBigNum& b)
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{
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*this = *this % b;
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return *this;
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}
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CBigNum& CBigNum::operator<<=(unsigned int shift)
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{
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if (!BN_lshift(this, this, shift))
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throw bignum_error("CBigNum:operator<<= : BN_lshift failed");
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return *this;
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}
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CBigNum& CBigNum::operator>>=(unsigned int shift)
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{
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// Note: BN_rshift segfaults on 64-bit if 2^shift is greater than the number
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// if built on ubuntu 9.04 or 9.10, probably depends on version of openssl
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CBigNum a = 1;
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a <<= shift;
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if (BN_cmp(&a, this) > 0)
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{
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*this = 0;
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return *this;
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}
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if (!BN_rshift(this, this, shift))
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throw bignum_error("CBigNum:operator>>= : BN_rshift failed");
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return *this;
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}
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CBigNum& CBigNum::operator++()
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{
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// prefix operator
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if (!BN_add(this, this, BN_value_one()))
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throw bignum_error("CBigNum::operator++ : BN_add failed");
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return *this;
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}
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const CBigNum CBigNum::operator++(int)
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{
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// postfix operator
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const CBigNum ret = *this;
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++(*this);
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return ret;
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}
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CBigNum& CBigNum::operator--()
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{
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// prefix operator
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CBigNum r;
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if (!BN_sub(&r, this, BN_value_one()))
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throw bignum_error("CBigNum::operator-- : BN_sub failed");
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*this = r;
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return *this;
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}
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const CBigNum CBigNum::operator--(int)
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{
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// postfix operator
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const CBigNum ret = *this;
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--(*this);
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return ret;
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}
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void CBigNum::setulong(unsigned long n)
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{
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if (!BN_set_word(this, n))
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throw bignum_error("CBigNum conversion from unsigned long : BN_set_word failed");
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}
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unsigned long CBigNum::getulong() const
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{
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return BN_get_word(this);
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}
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const CBigNum operator+(const CBigNum& a, const CBigNum& b)
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{
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CBigNum r;
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if (!BN_add(&r, &a, &b))
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throw bignum_error("CBigNum::operator+ : BN_add failed");
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return r;
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}
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const CBigNum operator-(const CBigNum& a, const CBigNum& b)
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{
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CBigNum r;
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if (!BN_sub(&r, &a, &b))
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throw bignum_error("CBigNum::operator- : BN_sub failed");
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return r;
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}
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const CBigNum operator-(const CBigNum& a)
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{
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CBigNum r(a);
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BN_set_negative(&r, !BN_is_negative(&r));
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return r;
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}
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const CBigNum operator*(const CBigNum& a, const CBigNum& b)
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{
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CAutoBN_CTX pctx;
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CBigNum r;
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if (!BN_mul(&r, &a, &b, pctx))
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throw bignum_error("CBigNum::operator* : BN_mul failed");
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return r;
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}
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const CBigNum operator/(const CBigNum& a, const CBigNum& b)
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{
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CAutoBN_CTX pctx;
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CBigNum r;
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if (!BN_div(&r, NULL, &a, &b, pctx))
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throw bignum_error("CBigNum::operator/ : BN_div failed");
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return r;
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}
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const CBigNum operator%(const CBigNum& a, const CBigNum& b)
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{
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CAutoBN_CTX pctx;
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CBigNum r;
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if (!BN_mod(&r, &a, &b, pctx))
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throw bignum_error("CBigNum::operator% : BN_div failed");
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return r;
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}
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const CBigNum operator<<(const CBigNum& a, unsigned int shift)
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{
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CBigNum r;
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if (!BN_lshift(&r, &a, shift))
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throw bignum_error("CBigNum:operator<< : BN_lshift failed");
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return r;
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}
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const CBigNum operator>>(const CBigNum& a, unsigned int shift)
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{
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CBigNum r = a;
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r >>= shift;
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return r;
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}
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bool operator== (const CBigNum& a, const CBigNum& b)
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{
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return (BN_cmp(&a, &b) == 0);
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}
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bool operator!= (const CBigNum& a, const CBigNum& b)
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{
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return (BN_cmp(&a, &b) != 0);
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}
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bool operator<= (const CBigNum& a, const CBigNum& b)
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{
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return (BN_cmp(&a, &b) <= 0);
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}
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bool operator>= (const CBigNum& a, const CBigNum& b)
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{
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return (BN_cmp(&a, &b) >= 0);
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}
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bool operator< (const CBigNum& a, const CBigNum& b)
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{
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return (BN_cmp(&a, &b) < 0);
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}
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bool operator> (const CBigNum& a, const CBigNum& b)
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{
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return (BN_cmp(&a, &b) > 0);
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}
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#if (ULONG_MAX > UINT_MAX)
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int BN_add_word64 (BIGNUM* bn, uint64 word)
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{
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return BN_add_word(bn, word);
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}
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int BN_sub_word64 (BIGNUM* bn, uint64 word)
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{
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return BN_sub_word(bn, word);
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}
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int BN_mul_word64 (BIGNUM* bn, uint64 word)
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{
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return BN_mul_word(bn, word);
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}
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uint64 BN_div_word64 (BIGNUM* bn, uint64 word)
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{
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return BN_div_word(bn, word);
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}
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#else
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int BN_add_word64 (BIGNUM *a, uint64 w)
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{
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|
CBigNum bn(w);
|
|
return BN_add(a, &bn, a);
|
|
}
|
|
|
|
int BN_sub_word64 (BIGNUM *a, uint64 w)
|
|
{
|
|
CBigNum bn(w);
|
|
return BN_sub(a, &bn, a);
|
|
}
|
|
|
|
int BN_mul_word64 (BIGNUM *a, uint64 w)
|
|
{
|
|
CBigNum bn(w);
|
|
CAutoBN_CTX ctx;
|
|
return BN_mul(a, &bn, a, ctx);
|
|
}
|
|
|
|
uint64 BN_div_word64 (BIGNUM *a, uint64 w)
|
|
{
|
|
CBigNum bn(w);
|
|
CAutoBN_CTX ctx;
|
|
return (BN_div(a, NULL, a, &bn, ctx) == 1) ? 0 : ((uint64)-1);
|
|
}
|
|
|
|
#endif
|