tdesktop/Telegram/SourceFiles/mtproto/mtpPublicRSA.h

83 lines
2.0 KiB
C++

/*
This file is part of Telegram Desktop,
an unofficial desktop messaging app, see https://telegram.org
Telegram Desktop 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.
It 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.
Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
Copyright (c) 2014 John Preston, https://tdesktop.com
*/
#pragma once
class mtpPublicRSA {
public:
mtpPublicRSA(const char *key) : data(new mtpPublicRSAInner(PEM_read_bio_RSAPublicKey(BIO_new_mem_buf(const_cast<char*>(key), -1), 0, 0, 0), 0)) {
if (!data->prsa) return;
int32 nBytes = BN_num_bytes(data->prsa->n);
int32 eBytes = BN_num_bytes(data->prsa->e);
string nStr(nBytes, 0), eStr(eBytes, 0);
BN_bn2bin(data->prsa->n, (uchar*)&nStr[0]);
BN_bn2bin(data->prsa->e, (uchar*)&eStr[0]);
mtpBuffer tmp;
MTP_string(nStr).write(tmp);
MTP_string(eStr).write(tmp);
uchar sha1Buffer[20];
data->fp = *(uint64*)(hashSha1(&tmp[0], tmp.size() * sizeof(mtpPrime), sha1Buffer) + 3);
}
mtpPublicRSA(const mtpPublicRSA &v) : data(v.data) {
++data->cnt;
}
mtpPublicRSA &operator=(const mtpPublicRSA &v) {
if (data != v.data) {
destroy();
data = v.data;
++data->cnt;
}
return *this;
}
uint64 fingerPrint() const {
return data->fp;
}
RSA *key() {
return data->prsa;
}
~mtpPublicRSA() {
destroy();
}
private:
void destroy() {
if (!--data->cnt) {
delete data;
}
}
struct mtpPublicRSAInner {
mtpPublicRSAInner(RSA *_prsa, uint64 _fp) : prsa(_prsa), cnt(1), fp(_fp) {
}
~mtpPublicRSAInner() {
RSA_free(prsa);
}
RSA *prsa;
uint32 cnt;
uint64 fp;
};
mtpPublicRSAInner *data;
};