tdesktop/Telegram/SourceFiles/mtproto/rsa_public_key.cpp

85 lines
2.4 KiB
C++

/*
This file is part of Telegram Desktop,
the official desktop version of Telegram 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.
In addition, as a special exception, the copyright holders give permission
to link the code of portions of this program with the OpenSSL library.
Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
Copyright (c) 2014-2016 John Preston, https://desktop.telegram.org
*/
#include "stdafx.h"
#include "mtproto/rsa_public_key.h"
#include <openssl/rsa.h>
#include <openssl/pem.h>
#include <openssl/bio.h>
#include <openssl/err.h>
using std::string;
namespace MTP {
namespace internal {
struct RSAPublicKey::Impl {
Impl(const char *key) : rsa(PEM_read_bio_RSAPublicKey(BIO_new_mem_buf(const_cast<char*>(key), -1), 0, 0, 0)) {
}
~Impl() {
RSA_free(rsa);
}
RSA *rsa;
uint64 fp = 0;
};
RSAPublicKey::RSAPublicKey(const char *key) : impl_(new Impl(key)) {
if (!impl_->rsa) return;
int nBytes = BN_num_bytes(impl_->rsa->n);
int eBytes = BN_num_bytes(impl_->rsa->e);
string nStr(nBytes, 0), eStr(eBytes, 0);
BN_bn2bin(impl_->rsa->n, (uchar*)&nStr[0]);
BN_bn2bin(impl_->rsa->e, (uchar*)&eStr[0]);
mtpBuffer tmp;
MTP_string(nStr).write(tmp);
MTP_string(eStr).write(tmp);
uchar sha1Buffer[20];
impl_->fp = *(uint64*)(hashSha1(&tmp[0], tmp.size() * sizeof(mtpPrime), sha1Buffer) + 3);
}
uint64 RSAPublicKey::getFingerPrint() const {
return impl_->fp;
}
bool RSAPublicKey::isValid() const {
return impl_->rsa != nullptr;
}
bool RSAPublicKey::encrypt(const void *data, string &result) const {
t_assert(isValid());
result.resize(256);
int res = RSA_public_encrypt(256, reinterpret_cast<const unsigned char*>(data), reinterpret_cast<uchar*>(&result[0]), impl_->rsa, RSA_NO_PADDING);
if (res != 256) {
ERR_load_crypto_strings();
LOG(("RSA Error: RSA_public_encrypt failed, key fp: %1, result: %2, error: %3").arg(getFingerPrint()).arg(res).arg(ERR_error_string(ERR_get_error(), 0)));
return false;
}
return true;
}
} // namespace internal
} // namespace MTP