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/*
* anytun
*
* The secure anycast tunneling protocol (satp) defines a protocol used
* for communication between any combination of unicast and anycast
* tunnel endpoints. It has less protocol overhead than IPSec in Tunnel
* mode and allows tunneling of every ETHER TYPE protocol (e.g.
* ethernet, ip, arp ...). satp directly includes cryptography and
* message authentication based on the methods used by SRTP. It is
* intended to deliver a generic, scaleable and secure solution for
* tunneling and relaying of packets of any protocol.
*
*
* Copyright (C) 2007-2014 Markus Grüneis, Othmar Gsenger, Erwin Nindl,
* Christian Pointner <satp@wirdorange.org>
*
* This file is part of Anytun.
*
* Anytun 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
* any later version.
*
* Anytun 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 Anytun. If not, see <http://www.gnu.org/licenses/>.
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
#include "openssl.h"
#include "../log.h"
#include <openssl/aes.h>
#include <openssl/sha.h>
#include "../anytunError.h"
namespace crypto {
Openssl::~Openssl()
{
}
void Openssl::calcMasterKeySalt(std::string passphrase, uint16_t length, Buffer& masterkey , Buffer& mastersalt)
{
cLog.msg(Log::PRIO_NOTICE) << "KeyDerivation: calculating master key from passphrase";
if(!length) {
cLog.msg(Log::PRIO_ERROR) << "KeyDerivation: bad master key length";
return;
}
if(length > SHA256_DIGEST_LENGTH) {
cLog.msg(Log::PRIO_ERROR) << "KeyDerivation: master key too long for passphrase algorithm";
return;
}
Buffer digest(uint32_t(SHA256_DIGEST_LENGTH));
SHA256(reinterpret_cast<const unsigned char*>(passphrase.c_str()), passphrase.length(), digest.getBuf());
masterkey.setLength(length);
std::memcpy(masterkey.getBuf(), &digest.getBuf()[digest.getLength() - masterkey.getLength()], masterkey.getLength());
cLog.msg(Log::PRIO_NOTICE) << "KeyDerivation: calculating master salt from passphrase";
Buffer digestsalt(uint32_t(SHA_DIGEST_LENGTH));
SHA1(reinterpret_cast<const unsigned char*>(passphrase.c_str()), passphrase.length(), digestsalt.getBuf());
mastersalt.setLength(SALT_LENGTH);
std::memcpy(mastersalt.getBuf(), &digestsalt.getBuf()[digestsalt.getLength() - mastersalt.getLength()], mastersalt.getLength());
}
uint32_t Openssl::cipher(uint8_t* in, uint32_t ilen, uint8_t* out, uint32_t olen, const Buffer& masterkey, const Buffer& mastersalt, role_t role, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux)
{
Buffer key(masterkey.getLength(), false);
cipher_aesctr_ctr_t ctr;
calcCryptCtr(masterkey, mastersalt, KD_OUTBOUND, role, LABEL_ENC, seq_nr, sender_id, mux, &ctr);
deriveKey(KD_OUTBOUND, LABEL_ENC, role, seq_nr, sender_id, mux, masterkey, mastersalt, key);
calc(in, ilen, out, olen, key, &ctr);
return ilen>olen ? ilen : olen;
}
uint32_t Openssl::decipher(uint8_t* in, uint32_t ilen, uint8_t* out, uint32_t olen, const Buffer& masterkey, const Buffer& mastersalt, role_t role, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux)
{
Buffer key(masterkey.getLength(), false);
cipher_aesctr_ctr_t ctr;
calcCryptCtr(masterkey, mastersalt, KD_INBOUND, role, LABEL_ENC, seq_nr, sender_id, mux, &ctr);
deriveKey(KD_INBOUND, LABEL_ENC, role, seq_nr, sender_id, mux, masterkey, mastersalt, key);
calc(in, ilen, out, olen, key, &ctr);
return ilen>olen ? ilen : olen;
}
void Openssl::calc(uint8_t* in, uint32_t ilen, uint8_t* out, uint32_t olen, const Buffer& key, cipher_aesctr_ctr_t * ctr)
{
AES_KEY aes_key;
int ret = AES_set_encrypt_key(key.getConstBuf(), key.getLength()*8, &aes_key);
if(ret) {
cLog.msg(Log::PRIO_ERROR) << "AesIcmCipher: Failed to set cipher ssl key (code: " << ret << ")";
AnytunError::throwErr() << "AesIcmCipher: Failed to set cipher ssl key (code: " << ret << ")";
}
if(CTR_LENGTH != AES_BLOCK_SIZE) {
cLog.msg(Log::PRIO_ERROR) << "AesIcmCipher: Failed to set cipher CTR: size doesn't fit";
AnytunError::throwErr() << ("AesIcmCipher: Failed to set cipher CTR: size doesn't fit");
}
unsigned int num = 0;
uint8_t ecount_buf[AES_BLOCK_SIZE];
std::memset(ecount_buf, 0, AES_BLOCK_SIZE);
AES_ctr128_encrypt(in, out, (ilen < olen) ? ilen : olen, &aes_key, ctr->buf_, ecount_buf, &num);
}
void Openssl::deriveKey(kd_dir_t dir, satp_prf_label_t label, role_t role, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux, const Buffer& masterkey, const Buffer& mastersalt, Buffer& key)
{
uint8_t ecount_buf[AES_BLOCK_SIZE];
AES_KEY aes_key;
key_derivation_aesctr_ctr_t ctr;
calcKeyCtr(mastersalt, dir, role, label, seq_nr, sender_id, mux, &ctr);
if(CTR_LENGTH != AES_BLOCK_SIZE) {
cLog.msg(Log::PRIO_ERROR) << "AesIcmCipher: Failed to set cipher CTR: size doesn't fit";
AnytunError::throwErr() << ("AesIcmCipher: Failed to set cipher CTR: size doesn't fit");
}
unsigned int num = 0;
std::memset(ecount_buf, 0, AES_BLOCK_SIZE);
std::memset(key.getBuf(), 0, key.getLength());
AES_ctr128_encrypt(key.getBuf(), key.getBuf(), key.getLength(), &aes_key, ctr.buf_, ecount_buf, &num);
}
std::string Openssl::printType()
{
return "Openssl";
}
//static
bool Openssl::init()
{
return true;
}
}
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