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/*
* ZeroTier One - Global Peer to Peer Ethernet
* Copyright (C) 2012-2013 ZeroTier Networks LLC
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*
* --
*
* ZeroTier may be used and distributed under the terms of the GPLv3, which
* are available at: http://www.gnu.org/licenses/gpl-3.0.html
*
* If you would like to embed ZeroTier into a commercial application or
* redistribute it in a modified binary form, please contact ZeroTier Networks
* LLC. Start here: http://www.zerotier.com/
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include "Constants.hpp"
#include "Identity.hpp"
#include "SHA512.hpp"
#include "Salsa20.hpp"
#include "Utils.hpp"
// Mask for second byte in hashcash criterion -- making it require
// 13 0 bits at the start of the hash.
#define ZT_IDENTITY_SHA_BYTE1_MASK 0xf8
namespace ZeroTier {
struct _Identity_generate_cond
{
_Identity_generate_cond() throw() {}
_Identity_generate_cond(char *sb) throw() : sha512buf(sb) {}
inline bool operator()(const C25519::Pair &kp) const
throw()
{
SHA512::hash(sha512buf,kp.pub.data,kp.pub.size());
if ((!sha512buf[0])&&(!(sha512buf[1] & ZT_IDENTITY_SHA_BYTE1_MASK)))
return true;
return false;
}
char *sha512buf;
};
void Identity::generate()
{
char sha512buf[64];
C25519::Pair kp;
do {
kp = C25519::generateSatisfying(_Identity_generate_cond(sha512buf));
_address.setTo(sha512buf + 59,ZT_ADDRESS_LENGTH); // last 5 bytes are address
} while (_address.isReserved());
_publicKey = kp.pub;
if (!_privateKey)
_privateKey = new C25519::Private();
*_privateKey = kp.priv;
}
bool Identity::locallyValidate() const
{
if (_address.isReserved())
return false;
char sha512buf[64];
char addrb[5];
_address.copyTo(addrb,5);
SHA512::hash(sha512buf,_publicKey.data,_publicKey.size());
return (
(!sha512buf[0])&&
(!(sha512buf[1] & ZT_IDENTITY_SHA_BYTE1_MASK))&&
(sha512buf[59] == addrb[0])&&
(sha512buf[60] == addrb[1])&&
(sha512buf[61] == addrb[2])&&
(sha512buf[62] == addrb[3])&&
(sha512buf[63] == addrb[4]));
}
std::string Identity::toString(bool includePrivate) const
{
std::string r;
r.append(_address.toString());
r.append(":0:"); // 0 == IDENTITY_TYPE_C25519
r.append(Utils::hex(_publicKey.data,_publicKey.size()));
if ((_privateKey)&&(includePrivate)) {
r.push_back(':');
r.append(Utils::hex(_privateKey->data,_privateKey->size()));
}
return r;
}
bool Identity::fromString(const char *str)
{
char *saveptr = (char *)0;
char tmp[4096];
if (!Utils::scopy(tmp,sizeof(tmp),str))
return false;
delete _privateKey;
_privateKey = (C25519::Private *)0;
int fno = 0;
for(char *f=Utils::stok(tmp,":",&saveptr);(f);f=Utils::stok((char *)0,":",&saveptr)) {
switch(fno++) {
case 0:
_address = Address(f);
if (_address.isReserved())
return false;
break;
case 1:
if (f[0] != '0')
return false;
break;
case 2:
if (Utils::unhex(f,_publicKey.data,_publicKey.size()) != _publicKey.size())
return false;
break;
case 3:
_privateKey = new C25519::Private();
if (Utils::unhex(f,_privateKey->data,_privateKey->size()) != _privateKey->size())
return false;
break;
default:
return false;
}
}
if (fno < 4)
return false;
return true;
}
} // namespace ZeroTier
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