mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-19 04:57:53 +00:00
156 lines
3.8 KiB
C++
156 lines
3.8 KiB
C++
/*
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* ZeroTier One - Global Peer to Peer Ethernet
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* Copyright (C) 2012-2013 ZeroTier Networks LLC
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* --
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*
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* ZeroTier may be used and distributed under the terms of the GPLv3, which
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* are available at: http://www.gnu.org/licenses/gpl-3.0.html
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*
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* If you would like to embed ZeroTier into a commercial application or
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* redistribute it in a modified binary form, please contact ZeroTier Networks
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* LLC. Start here: http://www.zerotier.com/
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include "Constants.hpp"
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#include "Identity.hpp"
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#include "SHA512.hpp"
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#include "Salsa20.hpp"
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#include "Utils.hpp"
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// Mask for second byte in hashcash criterion -- making it require
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// 13 0 bits at the start of the hash.
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#define ZT_IDENTITY_SHA_BYTE1_MASK 0xf8
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namespace ZeroTier {
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struct _Identity_generate_cond
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{
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_Identity_generate_cond() throw() {}
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_Identity_generate_cond(char *sb) throw() : sha512buf(sb) {}
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inline bool operator()(const C25519::Pair &kp) const
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throw()
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{
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SHA512::hash(sha512buf,kp.pub.data,kp.pub.size());
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if ((!sha512buf[0])&&(!(sha512buf[1] & ZT_IDENTITY_SHA_BYTE1_MASK)))
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return true;
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return false;
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}
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char *sha512buf;
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};
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void Identity::generate()
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{
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char sha512buf[64];
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C25519::Pair kp;
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do {
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kp = C25519::generateSatisfying(_Identity_generate_cond(sha512buf));
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_address.setTo(sha512buf + 59,ZT_ADDRESS_LENGTH); // last 5 bytes are address
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} while (_address.isReserved());
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_publicKey = kp.pub;
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if (!_privateKey)
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_privateKey = new C25519::Private();
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*_privateKey = kp.priv;
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}
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bool Identity::locallyValidate() const
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{
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if (_address.isReserved())
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return false;
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char sha512buf[64];
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char addrb[5];
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_address.copyTo(addrb,5);
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SHA512::hash(sha512buf,_publicKey.data,_publicKey.size());
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return (
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(!sha512buf[0])&&
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(!(sha512buf[1] & ZT_IDENTITY_SHA_BYTE1_MASK))&&
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(sha512buf[59] == addrb[0])&&
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(sha512buf[60] == addrb[1])&&
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(sha512buf[61] == addrb[2])&&
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(sha512buf[62] == addrb[3])&&
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(sha512buf[63] == addrb[4]));
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}
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std::string Identity::toString(bool includePrivate) const
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{
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std::string r;
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r.append(_address.toString());
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r.append(":0:"); // 0 == IDENTITY_TYPE_C25519
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r.append(Utils::hex(_publicKey.data,_publicKey.size()));
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if ((_privateKey)&&(includePrivate)) {
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r.push_back(':');
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r.append(Utils::hex(_privateKey->data,_privateKey->size()));
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}
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return r;
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}
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bool Identity::fromString(const char *str)
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{
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char *saveptr = (char *)0;
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char tmp[4096];
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if (!Utils::scopy(tmp,sizeof(tmp),str))
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return false;
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delete _privateKey;
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_privateKey = (C25519::Private *)0;
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int fno = 0;
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for(char *f=Utils::stok(tmp,":",&saveptr);(f);f=Utils::stok((char *)0,":",&saveptr)) {
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switch(fno++) {
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case 0:
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_address = Address(f);
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if (_address.isReserved())
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return false;
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break;
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case 1:
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if (f[0] != '0')
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return false;
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break;
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case 2:
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if (Utils::unhex(f,_publicKey.data,_publicKey.size()) != _publicKey.size())
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return false;
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break;
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case 3:
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_privateKey = new C25519::Private();
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if (Utils::unhex(f,_privateKey->data,_privateKey->size()) != _privateKey->size())
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return false;
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break;
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default:
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return false;
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}
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}
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if (fno < 4)
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return false;
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return true;
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}
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} // namespace ZeroTier
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