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/*
This file is part of solidity.
solidity is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
solidity is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with solidity. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file CommonData.cpp
* @author Gav Wood <i@gavwood.com>
* @date 2014
*/
#include <libdevcore/CommonData.h>
#include <libdevcore/Exceptions.h>
#include <libdevcore/Assertions.h>
#include <libdevcore/Keccak256.h>
#include <boost/algorithm/string.hpp>
using namespace std;
using namespace dev;
int dev::fromHex(char _i, WhenError _throw)
{
if (_i >= '0' && _i <= '9')
return _i - '0';
if (_i >= 'a' && _i <= 'f')
return _i - 'a' + 10;
if (_i >= 'A' && _i <= 'F')
return _i - 'A' + 10;
if (_throw == WhenError::Throw)
BOOST_THROW_EXCEPTION(BadHexCharacter() << errinfo_invalidSymbol(_i));
else
return -1;
}
bytes dev::fromHex(std::string const& _s, WhenError _throw)
{
unsigned s = (_s.size() >= 2 && _s[0] == '0' && _s[1] == 'x') ? 2 : 0;
std::vector<uint8_t> ret;
ret.reserve((_s.size() - s + 1) / 2);
if (_s.size() % 2)
{
int h = fromHex(_s[s++], WhenError::DontThrow);
if (h != -1)
ret.push_back(h);
else if (_throw == WhenError::Throw)
BOOST_THROW_EXCEPTION(BadHexCharacter());
else
return bytes();
}
for (unsigned i = s; i < _s.size(); i += 2)
{
int h = fromHex(_s[i], WhenError::DontThrow);
int l = fromHex(_s[i + 1], WhenError::DontThrow);
if (h != -1 && l != -1)
ret.push_back((byte)(h * 16 + l));
else if (_throw == WhenError::Throw)
BOOST_THROW_EXCEPTION(BadHexCharacter());
else
return bytes();
}
return ret;
}
bool dev::passesAddressChecksum(string const& _str, bool _strict)
{
string s = _str.substr(0, 2) == "0x" ? _str : "0x" + _str;
if (s.length() != 42)
return false;
if (!_strict && (
s.find_first_of("abcdef") == string::npos ||
s.find_first_of("ABCDEF") == string::npos
))
return true;
return s == dev::getChecksummedAddress(s);
}
string dev::getChecksummedAddress(string const& _addr)
{
string s = _addr.substr(0, 2) == "0x" ? _addr.substr(2) : _addr;
assertThrow(s.length() == 40, InvalidAddress, "");
assertThrow(s.find_first_not_of("0123456789abcdefABCDEF") == string::npos, InvalidAddress, "");
h256 hash = keccak256(boost::algorithm::to_lower_copy(s, std::locale::classic()));
string ret = "0x";
for (size_t i = 0; i < 40; ++i)
{
char addressCharacter = s[i];
unsigned nibble = (unsigned(hash[i / 2]) >> (4 * (1 - (i % 2)))) & 0xf;
if (nibble >= 8)
ret += toupper(addressCharacter);
else
ret += tolower(addressCharacter);
}
return ret;
}
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