85 lines
2.4 KiB
C++
85 lines
2.4 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop version of Telegram messaging app, see https://telegram.org
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Telegram Desktop 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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It 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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In addition, as a special exception, the copyright holders give permission
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to link the code of portions of this program with the OpenSSL library.
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Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
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Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
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*/
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#include "stdafx.h"
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#include "mtproto/rsa_public_key.h"
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#include <openssl/rsa.h>
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#include <openssl/pem.h>
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#include <openssl/bio.h>
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#include <openssl/err.h>
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using std::string;
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namespace MTP {
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namespace internal {
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struct RSAPublicKey::Impl {
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Impl(const char *key) : rsa(PEM_read_bio_RSAPublicKey(BIO_new_mem_buf(const_cast<char*>(key), -1), 0, 0, 0)) {
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}
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~Impl() {
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RSA_free(rsa);
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}
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RSA *rsa;
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uint64 fp = 0;
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};
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RSAPublicKey::RSAPublicKey(const char *key) : impl_(new Impl(key)) {
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if (!impl_->rsa) return;
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int nBytes = BN_num_bytes(impl_->rsa->n);
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int eBytes = BN_num_bytes(impl_->rsa->e);
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string nStr(nBytes, 0), eStr(eBytes, 0);
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BN_bn2bin(impl_->rsa->n, (uchar*)&nStr[0]);
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BN_bn2bin(impl_->rsa->e, (uchar*)&eStr[0]);
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mtpBuffer tmp;
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MTP_string(nStr).write(tmp);
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MTP_string(eStr).write(tmp);
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uchar sha1Buffer[20];
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impl_->fp = *(uint64*)(hashSha1(&tmp[0], tmp.size() * sizeof(mtpPrime), sha1Buffer) + 3);
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}
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uint64 RSAPublicKey::getFingerPrint() const {
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return impl_->fp;
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}
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bool RSAPublicKey::isValid() const {
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return impl_->rsa != nullptr;
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}
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bool RSAPublicKey::encrypt(const void *data, string &result) const {
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t_assert(isValid());
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result.resize(256);
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int res = RSA_public_encrypt(256, reinterpret_cast<const unsigned char*>(data), reinterpret_cast<uchar*>(&result[0]), impl_->rsa, RSA_NO_PADDING);
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if (res != 256) {
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ERR_load_crypto_strings();
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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)));
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return false;
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}
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return true;
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}
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} // namespace internal
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} // namespace MTP
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