Blob ConvertFromBase58(RCString s, bool bCheckHash) {
BigInteger bi = 0;
for (const char *p=s; *p; ++p) {
if (const char *q = strchr(s_pszBase58, *p)) {
bi = bi*58 + BigInteger(q-s_pszBase58);
} else
Throw(errc::invalid_argument);
}
vector<byte> v((bi.Length+7)/8);
bi.ToBytes(&v[0], v.size());
if (v.size()>=2 && v.end()[-1]==0 && v.end()[-1]>=0x80)
v.resize(v.size()-1);
vector<byte> r;
for (const char *p=s; *p==s_pszBase58[0]; ++p)
r.push_back(0);
r.resize(r.size()+v.size());
std::reverse_copy(v.begin(), v.end(), r.end()-v.size());
if (r.size() < 4)
Throw(E_FAIL);
if (bCheckHash) {
HashValue hash = HasherEng::GetCurrent()->HashForAddress(ConstBuf(&r[0], r.size()-4));
if (memcmp(hash.data(), &r.end()[-4], 4))
Throw(HRESULT_FROM_WIN32(ERROR_CRC));
}
return Blob(&r[0], r.size()-4);
}
Blob ConvertFromBase58ShaSquare(RCString s) {
BigInteger bi = 0;
for (const char *p=s; *p; ++p) {
if (const char *q = strchr(s_pszBase58, *p)) {
bi = bi*58 + BigInteger(q-s_pszBase58);
} else
Throw(E_INVALIDARG);
}
vector<byte> v((bi.Length+7)/8);
bi.ToBytes(&v[0], v.size());
if (v.size()>=2 && v.end()[-1]==0 && v.end()[-1]>=0x80)
v.resize(v.size()-1);
vector<byte> r;
for (const char *p=s; *p==s_pszBase58[0]; ++p)
r.push_back(0);
r.resize(r.size()+v.size());
std::reverse_copy(v.begin(), v.end(), r.end()-v.size());
if (r.size() < 4)
Throw(E_FAIL);
SHA256 sha;
HashValue hash = HashValue(sha.ComputeHash(sha.ComputeHash(ConstBuf(&r[0], r.size()-4))));
if (memcmp(hash.data(), &r.end()[-4], 4))
Throw(HRESULT_FROM_WIN32(ERROR_CRC));
return Blob(&r[0], r.size()-4);
}
uint32_t PrimeMinerShare::GetDifficulty() const {
MemoryStream ms;
base::WriteHeader(ProtocolWriter(ms).Ref());
HashValue h = Hash(ms);
if (h.data()[31] < 0x80)
Throw(CoinErr::MINER_REJECTED);
BigInteger origin = HashValueToBigInteger(h) * PrimeChainMultiplier;
PrimeTester tester; //!!!TODO move to some long-time scope
return uint32_t(tester.ProbablePrimeChainTest(Bn(origin)).BestTypeLength().second * 0x1000000);
}
String ConvertToBase58(const ConstBuf& cbuf) {
HashValue hash = HasherEng::GetCurrent()->HashForAddress(cbuf);
Blob v = cbuf + Blob(hash.data(), 4);
vector<char> r;
vector<byte> tmp(v.Size+1, 0);
std::reverse_copy(v.begin(), v.end(), tmp.begin());
for (BigInteger n(&tmp[0], tmp.size()); Sign(n);) {
pair<BigInteger, BigInteger> pp = div(n, 58);
n = pp.first;
r.insert(r.begin(), s_pszBase58[explicit_cast<int>(pp.second)]);
}
for (int i=0; i<v.Size && !v.constData()[i]; ++i)
r.insert(r.begin(), s_pszBase58[0]);
return String(&r[0], r.size());
}
String ConvertToBase58ShaSquare(const ConstBuf& cbuf) {
SHA256 sha;
HashValue hash = HashValue(sha.ComputeHash(sha.ComputeHash(cbuf)));
Blob v = cbuf + Blob(hash.data(), 4);
vector<char> r;
vector<byte> tmp(v.Size+1, 0);
std::reverse_copy(v.begin(), v.end(), tmp.begin());
for (BigInteger n(&tmp[0], tmp.size()); Sign(n);) {
pair<BigInteger, BigInteger> pp = div(n, 58);
n = pp.first;
r.insert(r.begin(), s_pszBase58[explicit_cast<int>(pp.second)]);
}
for (int i=0; i<v.Size && !v.constData()[i]; ++i)
r.insert(r.begin(), s_pszBase58[0]);
return String(&r[0], r.size());
}
BigInteger HashValueToBigInteger(const HashValue& hash) {
byte ar[33];
memcpy(ar, hash.data(), 32);
ar[32] = 0;
return BigInteger(ar, 33);
}
