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Our bit order change to uint256 broke the logic used to convert CBigNum's to

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and from uint256's. This code is really awful though. We probably should
just re-implement what we need of it. (Which is very little.) It looks
like the author just didn't know about BN_bin2bn and BIN_bn2bin.
This commit is contained in:
JoelKatz
2012-06-08 20:45:20 -07:00
parent ea5ae2a113
commit eb2ce22eff
1 changed files with 8 additions and 36 deletions
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44
src/bignum.h
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@@ -186,47 +186,19 @@ public:
BN_mpi2bn(pch, p - pch, this);
}
void setuint256(uint256 n)
void setuint256(const 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);
BN_bin2bn(n.begin(), n.size(), NULL);
}
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;
uint256 ret;
int size = BN_num_bytes(this);
if (size > ret.size())
return ret;
BN_bn2bin(this, ret.begin() + (ret.size() - BN_num_bytes(this)));
return ret;
}
void setvch(const std::vector<unsigned char>& vch)